JP5153606B2 - Adjustment method of antenna device - Google Patents

Description

  The present invention relates to a method for adjusting a resonance frequency in a planar antenna device in which a flat dielectric substrate is disposed on a conductor base and a radiation electrode is disposed on the upper surface of the dielectric substrate. is there.

In the conventional planar antenna device, as shown in FIG. 47, the conductor base 10 as the GND electrode is flat and rectangular in shape when viewed from above, and an empty space is provided in the center thereof. An annular dielectric substrate 12 is disposed, a substantially rectangular radiation electrode 14 is disposed so as to be supported by the upper surface of the dielectric substrate 12, and the feeding terminal 16 is disposed at an appropriate position of the radiation electrode 14. It is installed and configured. Such a technique is disclosed in Japanese Patent Application Laid-Open No. 2005-51576.
Japanese Patent Laid-Open No. 2005-51576

  In the conventional technique shown in FIG. 47 proposed in the above-mentioned Patent Document 1 and the like, the dielectric base 12 is annular, and an empty space is provided in the center thereof. The amount of material is small. By the way, the dielectric substrate 12 may vary in its dielectric constant for each manufacturing lot, and the resonance frequency may change. Therefore, in the past, adjustments have been made by providing a cutout or shaving in the radiation electrode 14 with respect to changes in the resonance frequency due to variations in the dielectric constant of the dielectric substrate 12. The adjustment operation of the resonance frequency is complicated, and the operation of reliably removing the shavings generated by providing or cutting out the notches in the radiation electrode 14 is also complicated.

  Therefore, the present invention has been made in view of the circumstances as described above, and easily shifts the position where the dielectric base material is disposed with respect to a change in the resonance frequency due to variations in the dielectric constant of the dielectric base material. It is an object to provide an adjustment method for an antenna device that can be adjusted

  In order to achieve such an object, the antenna device adjustment method of the present invention is a flat, conductive, and generally rectangular external shape on a conductor base serving as a GND electrode, and an open space is provided in the central portion and viewed from above. A dielectric base material is provided with an interval between two opposing substantially U-shaped portions that are divided into two, and a substantially rectangular radiation electrode is provided on the upper surface of the dielectric base material. The side of the radiation electrode is arranged substantially parallel to the side of the dielectric base so that the dielectric base supports the peripheral portion of the radiation electrode in a substantially annular shape. The two corners are cut off slightly in a chamfered shape, and a feeding terminal is provided by shifting to one side from the central position of the radiation electrode so that the diagonal direction of the radiation electrode is the current excitation direction. The radiation in a direction passing through a central position and the feed terminal In the antenna device in which the substantially U-shaped dielectric base material is disposed so as to support two sides of the pole, one or two of the substantially U-shaped shapes of the dielectric base material with respect to the radiation electrode The arrangement frequency of the two members is shifted in the direction passing through the central position of the radiation electrode and the power supply terminal to adjust the resonance frequency.

  In addition, on the conductor base as the GND electrode, the entire outer shape is flat and substantially rectangular, and an empty space is provided in the central portion. A dielectric base material is disposed with a gap between the end portions, and a substantially rectangular radiation electrode is disposed on the top surface of the dielectric base material so that the side thereof is substantially parallel to the side of the dielectric base material. The peripheral portion of the radiation electrode is supported in an annular shape by the dielectric substrate, and one corner of the radiation electrode or two opposite corners are slightly cut off in a chamfered shape, A feeding terminal is provided by shifting to one side from the central position of the radiation electrode so that the diagonal direction becomes the excitation direction of the current, and in a direction orthogonal to the central position of the radiation electrode and the direction passing through the feeding terminal. A substantially U-shape to support the two sides of the radiation electrode. In the antenna device in which the dielectric base material is disposed, the disposition position of the substantially U-shaped one or two members of the dielectric base material with respect to the radiation electrode is defined as the center position of the radiation electrode. The resonance frequency may be adjusted by shifting in a direction orthogonal to the direction passing through the power supply terminal.

  In the method for adjusting an antenna device according to claim 1 or 2, if the resonance frequency shifts to a lower side due to variations in the dielectric constant of the dielectric substrate, one of the substantially U-shaped dielectric substrate or By enlarging the arrangement positions of the two members to the outside, the resonance frequency can be increased and adjusted to a predetermined frequency. Also, if the resonance frequency shifts to the higher side, the resonance frequency is lowered and adjusted to a predetermined frequency by narrowing the arrangement position of the substantially U-shaped one or two members of the dielectric base inward. it can. Since the resonance frequency can be adjusted to a predetermined frequency simply by shifting the position of the dielectric substrate, there is no need to cut or cut the radiation electrode as in the past, and the radiation electrode is further cut or cut. There is no shavings that occur in Naturally, the trouble of removing the shavings can be saved.

  First, an antenna apparatus used in the first embodiment of the antenna apparatus adjustment method of the present invention will be described with reference to FIG. FIG. 1 is an external perspective view of an antenna device used in the first embodiment.

  The antenna device used in the first embodiment shown in FIG. 1 is an annular device that is flat and has a generally rectangular outer shape as viewed from above, with a free space at the center, on a conductor base 10 as a GND electrode. In addition, when viewed from above, the dielectric base materials 22, 22 are arranged with a space between two opposed substantially U-shaped portions that are opposed to each other and spaced from each other. The substantially rectangular radiation electrode 14 is slightly cut off in a chamfered shape at two opposite corners of the substantially rectangular diagonal line, and is shifted to one side from the central position p of the radiation electrode 14 so that the feeding terminal 16 is The diagonal direction of the radiation electrode 14 is provided so as to be the current excitation direction. The radiation electrode 14 radiates on the two substantially U-shaped upper surfaces of the dielectric base materials 22 and 22 so that the sides thereof are substantially parallel to the substantially rectangular sides of the dielectric base materials 22 and 22 as a whole. It arrange | positions so that the peripheral part of the electrode 14 may be supported substantially cyclically | annularly. In addition, the substantially U-shaped members of the dielectric base materials 22 and 22 are disposed so as to support the two sides of the radiation electrode 14 in the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. The dimensions of the substantially U-shaped members of the dielectric base materials 22 and 22 are, for example, an approximately U-shaped central member of 30.0 mm and both side members of 12.5 mm, and facing U-shaped members facing each other. The distance between the ends is 5.0 mm.

  The adjustment method of the first embodiment will be described using the antenna device having such a structure. FIG. 2 is a view of the radiation electrode 14 and the dielectric base materials 22 and 22 as viewed from above, and shows a substantially U-shaped member of the dielectric base materials 22 and 22 that are displaced in order to adjust the resonance frequency. . As shown in FIG. 2, in the direction passing through the central position p of the radiation electrode 14 and the power supply terminal 16, one substantially U-shape on the side opposite to the side where the power supply terminals 16 of the dielectric base materials 22 and 22 are provided. A member (a substantially U-shaped member on the upper side in FIG. 2) is shifted by Δ in a direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. FIGS. 3A and 3B show the antenna characteristics when the reference shift dimension Δ is 0.0 mm. FIG. 3A is a VSWR characteristic diagram, and FIG. 3B is a Smith chart. Then, when one substantially U-shaped member on the upper side of the dielectric base materials 22 and 22 is shifted so that Δ is expanded outward by 0.1 mm, the VSWR characteristic diagram of FIG. As shown in the Smith chart), the resonance frequency shifts slightly higher and the impedance changes counterclockwise counterclockwise. Further, when the one substantially U-shaped member on the upper side of the dielectric base materials 22 and 22 is shifted so as to be greatly expanded outward so that Δ is 0.3 mm, the VSWR characteristic of FIG. As shown in the Smith chart of FIG. 6B, the resonance frequency shifts to a higher level, and the impedance changes greatly counterclockwise counterclockwise. In addition, one substantially U-shaped member on the upper side of the dielectric base materials 22, 22 is placed in the direction passing through the center position p of the radiation electrode 14 and the power supply terminal 16, and Δ is inward by −0.1 mm. When shifted so as to narrow, as shown in the VSWR characteristic diagram of FIG. 6A and the Smith chart of FIG. 6B, the resonance frequency shifts slightly lower than the reference shown in FIG. Change around. Further, when the one substantially U-shaped member on the upper side of the dielectric base materials 22 and 22 is shifted so as to be narrowed inward so that Δ becomes −0.3 mm, the VSWR characteristic of FIG. As shown in the Smith chart of FIG. 5B, the resonance frequency shifts further to the lower side, and the impedance further changes clockwise in the clockwise direction. FIG. 8 is a table showing changes in these resonance frequencies, fL is the lower resonance frequency of the two resonance frequencies of the antenna device, and fH is the higher resonance frequency of the two resonance frequencies. F0 is the average frequency of the two resonance frequencies. FIG. 9 is a graph of FIG. As is clear from FIG. 9, the resonance frequency increases as the one substantially U-shaped member on the upper side of the dielectric base material 22, 22 is expanded so as to be expanded outward, and the resonance is increased as it is narrowed toward the inner side. The frequency will be low. Accordingly, the resonance frequency can be easily adjusted by appropriately shifting one substantially U-shaped member on the upper side of the dielectric base materials 22 and 22 in the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. be able to.

  Further, another adjustment method of the first embodiment will be described. FIG. 10 is a view of the radiation electrode 14 and the dielectric base materials 22 and 22 as viewed from above. The dielectric base materials 22 and 22 whose positions are shifted to adjust the resonance frequency by another method are shown in FIG. The member of is shown. As shown in FIG. 10, in the direction passing through the central position p of the radiation electrode 14 and the power supply terminal 16, one substantially U-shaped member on the side where the power supply terminals 16 of the dielectric base materials 22 and 22 are provided (FIG. 10). , The lower substantially U-shaped member) is shifted by Δ in the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. The antenna characteristics when the reference shift dimension Δ is 0.0 mm are the same as those shown in FIG. Then, when one substantially U-shaped member on the lower side of the dielectric base materials 22 and 22 is shifted so that Δ is expanded outward by 0.1 mm, the VSWR characteristic diagram of FIG. As shown in the Smith chart of b), the resonance frequency shifts slightly higher and the impedance changes counterclockwise counterclockwise. Further, when one substantially U-shaped member on the lower side of the dielectric base materials 22 and 22 is shifted so as to be greatly expanded outward so that Δ becomes 0.3 mm, the VSWR shown in FIG. As shown in the characteristic diagram and the Smith chart of (b), the resonance frequency shifts to a higher level and the impedance changes greatly counterclockwise counterclockwise. Further, one substantially U-shaped member on the lower side of the dielectric base materials 22, 22 is disposed in the direction passing through the central position p of the radiation electrode 14 and the power supply terminal 16, and Δ is −0.1 mm in the opposite direction. When the shift is made narrower, the resonance frequency shifts slightly lower than the reference shown in FIG. 3 and the impedance is clockwise as shown in the VSWR characteristic diagram of FIG. 13 and the Smith chart of FIG. 13B. Changes clockwise. Further, when one substantially U-shaped member on the lower side of the dielectric base materials 22 and 22 is shifted so as to be narrowed inward so that Δ becomes −0.3 mm, the VSWR shown in FIG. As shown in the characteristic diagram and the Smith chart of (b), the resonance frequency shifts further to the lower side, and the impedance changes further in the clockwise direction. FIG. 15 is a table showing changes in these resonance frequencies, fL is the lower resonance frequency of the two resonance frequencies of the antenna device, and fH is the higher resonance frequency of the two resonance frequencies. F0 is the average frequency of the two resonance frequencies. FIG. 16 is a graph of FIG. As is clear from FIG. 16, the resonance frequency increases as one of the substantially U-shaped members on the lower side of the dielectric base materials 22, 22 is expanded so as to expand outward, and as it is shifted so as to narrow toward the inner side. The resonance frequency is low. Accordingly, the resonance frequency can be easily adjusted by appropriately shifting one substantially U-shaped member on the lower side of the dielectric base materials 22 and 22 in the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. can do.

  Furthermore, another adjustment method of the first embodiment will be described. FIG. 17 is a view of the radiation electrode 14 and the dielectric base materials 22 and 22 as viewed from above, and is substantially U-shaped for the dielectric base materials 22 and 22 whose positions are shifted in order to adjust the resonance frequency by another method. The member of is shown. As shown in FIG. 17, in the direction passing through the central position p of the radiation electrode 14 and the power supply terminal 16, two substantially U-shaped characters are provided on both sides of the dielectric base materials 22 and 22 where the power supply terminal 16 is provided and on the opposite side. 17 are shifted by Δ / 2 in the direction passing through the central position p of the radiation electrode 14 and the feed terminal 16, respectively (in FIG. 17, upper and lower substantially U-shaped members). The antenna characteristics in the case where the reference total shift dimension Δ is 0.0 mm are the same as those shown in FIG. When the two substantially U-shaped members on the upper and lower sides of the dielectric base materials 22 and 22 are shifted so as to expand outward so that Δ is 0.2 mm by 0.1 mm each, As shown in the VSWR characteristic diagram of FIG. 18 (a) and the Smith chart of (b), the resonance frequency shifts slightly higher and the impedance changes counterclockwise counterclockwise. Furthermore, when the two substantially U-shaped members on the upper and lower sides of the dielectric base materials 22 and 22 are shifted so as to greatly expand outward so that Δ is 0.6 mm each by 0.3 mm, As shown in the VSWR characteristic diagram of FIG. 19A and the Smith chart of FIG. 19B, the resonance frequency shifts to a higher side and the impedance changes greatly counterclockwise counterclockwise. In addition, two substantially U-shaped members on the upper side and the lower side of the dielectric base materials 22 and 22 are each set in a direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16 in the opposite direction by −0.1 mm. When Δ is shifted inward by −0.2 mm, the resonance frequency is slightly lower than the reference shown in FIG. 3, as shown in the VSWR characteristic diagram in FIG. 20 and the Smith chart in FIG. As it shifts to a lower level, the impedance changes clockwise. Furthermore, when the two substantially U-shaped members on the upper and lower sides of the dielectric base materials 22 and 22 are shifted so as to be greatly narrowed inward so that Δ is −0.6 mm each by −0.3 mm. As shown in the VSWR characteristic diagram of FIG. 21A and the Smith chart of FIG. 21B, the resonance frequency shifts to a lower side, and the impedance further changes clockwise in the clockwise direction. FIG. 22 is a table showing changes in these resonance frequencies, fL is the lower resonance frequency of the two resonance frequencies of the antenna device, and fH is the higher resonance frequency of the two resonance frequencies. F0 is the average frequency of the two resonance frequencies. FIG. 23 is a graph of FIG. As is clear from FIG. 23, the resonance frequency increases as the two substantially U-shaped members on the upper and lower sides of the dielectric base materials 22 and 22 are shifted outward so as to expand to the outside. The resonance frequency becomes lower as the shift is made narrower. Therefore, the resonance frequency can be simplified by appropriately shifting the two substantially U-shaped members on the upper and lower sides of the dielectric base materials 22 and 22 in the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. Can be adjusted.

  Next, an antenna apparatus used in a second embodiment of the antenna apparatus adjustment method of the present invention will be described with reference to FIG. FIG. 24 is an external perspective view of the antenna device used in the second embodiment.

  The antenna device used in the second embodiment shown in FIG. 24 is an annular device in which the outer shape of the conductor base 10 as a GND electrode is flat and substantially rectangular as viewed from above, and an empty space is provided at the center thereof. In addition, when viewed from above, the dielectric base materials 22, 22 are arranged with a space between two opposed substantially U-shaped portions that are opposed to each other and spaced from each other. The substantially rectangular radiation electrode 14 is slightly cut off in a chamfered shape at two opposite corners of the substantially rectangular diagonal line, and is shifted to one side from the central position p of the radiation electrode 14 so that the feeding terminal 16 is The diagonal direction of the radiation electrode 14 is provided so as to be the current excitation direction. The radiation electrode 14 radiates on the two substantially U-shaped upper surfaces of the dielectric base materials 22 and 22 so that the sides thereof are substantially parallel to the substantially rectangular sides of the dielectric base materials 22 and 22 as a whole. It arrange | positions so that the peripheral part of the electrode 14 may be supported substantially cyclically | annularly. Then, the substantially U-shaped members of the dielectric base materials 22 and 22 are disposed so as to support the two sides of the radiation electrode 14 in the direction orthogonal to the center position p of the radiation electrode 14 and the direction passing through the power supply terminal 16. This is different from the structure used in the first embodiment. The dimensions of the substantially U-shaped members of the dielectric base materials 22 and 22 are, for example, an approximately U-shaped central member of 30.0 mm and both side members of 12.5 mm, and facing U-shaped members facing each other. The distance between the end portions is 5.0 mm, which is the same as the structure used in the first embodiment.

  The adjustment method of the second embodiment will be described using the antenna device having such a structure. FIG. 25 is a view of the radiation electrode 14 and the dielectric base materials 22 and 22 as viewed from above, and shows a substantially U-shaped member of the dielectric base materials 22 and 22 that are shifted in position to adjust the resonance frequency. . As shown in FIG. 25, one substantially U-shaped member of the dielectric base materials 22 and 22 in the direction perpendicular to the direction passing through the central position p of the radiation electrode 14 and the power supply terminal 16 ( The U-shaped member) is shifted by Δ in a direction orthogonal to the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. FIGS. 26A and 26B show antenna characteristics when the reference shift dimension Δ is 0.0 mm. FIG. 26A is a VSWR characteristic diagram and FIG. 26B is a Smith chart. Then, when one substantially U-shaped member on the left side of the dielectric base materials 22 and 22 is shifted so that Δ is expanded outward by 0.1 mm, the VSWR characteristic diagram of FIG. As shown in the Smith chart), the resonance frequency shifts slightly higher and the impedance changes clockwise. Further, when one of the substantially U-shaped members on the left side of the dielectric base materials 22 and 22 is shifted so as to be greatly expanded outward so that Δ is 0.3 mm, the VSWR characteristic shown in FIG. As shown in the Smith chart of FIG. 4B, the resonance frequency shifts to a higher level, and the impedance changes greatly in the clockwise direction. In addition, the dimension Δ for shifting the one substantially U-shaped member on the left side of the dielectric base materials 22 and 22 in the reverse direction in a direction orthogonal to the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16 is given. When shifted so as to narrow inward by -0.1 mm, the resonance frequency shifts slightly lower than the reference shown in FIG. 26 as shown in the VSWR characteristic diagram of FIG. 29 and the Smith chart of FIG. At the same time, the impedance changes counterclockwise counterclockwise. Further, when one of the substantially U-shaped members on the left side of the dielectric base materials 22 and 22 is shifted so as to be narrowed inward so that Δ becomes −0.3 mm, the VSWR characteristic shown in FIG. As shown in the Smith chart of FIG. 5B, the resonance frequency shifts further to the lower side, and the impedance changes greatly counterclockwise counterclockwise. FIG. 31 is a table showing changes in these resonance frequencies, fL is the lower resonance frequency of the two resonance frequencies of the antenna device, and fH is the higher resonance frequency of the two resonance frequencies. F0 is the average frequency of the two resonance frequencies. FIG. 32 is a graph of FIG. As is clear from FIG. 32, as in the first embodiment, the resonance frequency becomes higher as the one substantially U-shaped member on the left side of the dielectric base material 22, 22 is shifted outwardly, The resonance frequency becomes lower as the position is narrowed inward. However, the change in impedance changes in the opposite direction to the first embodiment. Therefore, the resonance frequency is adjusted by appropriately shifting one substantially U-shaped member on the left side of the dielectric base materials 22 and 22 in a direction orthogonal to the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. Can be adjusted easily. Moreover, the change in impedance changes in the opposite direction to that in the first embodiment.

  Another adjustment method of the second embodiment will be described. FIG. 33 is a view of the radiation electrode 14 and the dielectric base materials 22 and 22 as viewed from above, and is a substantially U-shape of the dielectric base materials 22 and 22 whose positions are shifted in order to adjust the resonance frequency by another method. The member of is shown. As shown in FIG. 33, one substantially U-shaped member of the dielectric base materials 22 and 22 in the direction orthogonal to the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16 (the right side in FIG. The U-shaped member) is shifted by Δ in the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. The antenna characteristics when the reference shift dimension Δ is 0.0 mm are the same as those shown in FIG. When one substantially U-shaped member on the right side of the dielectric base materials 22 and 22 is shifted so that Δ is increased outward by 0.1 mm, the VSWR characteristic diagram of FIG. As shown in the Smith chart), the resonance frequency shifts slightly higher and the impedance changes clockwise. Further, when the substantially U-shaped member on the right side of the dielectric base materials 22 and 22 is shifted so as to be greatly enlarged outward so that Δ is 0.3 mm, the VSWR characteristic of FIG. As shown in the Smith chart of FIG. 4B, the resonance frequency shifts to a higher level, and the impedance changes greatly in the clockwise direction. In addition, one substantially U-shaped member on the right side of the dielectric base material 22, 22 is perpendicular to the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16, and Δ is −0. When it is shifted inward by 1 mm, the resonance frequency shifts slightly lower than the reference shown in FIG. 26 and the impedance is lower than the reference shown in FIG. 26, as shown in the VSWR characteristic diagram of FIG. 36 and the Smith chart of FIG. It changes counterclockwise counterclockwise. Further, when one substantially U-shaped member on the right side of the dielectric base materials 22 and 22 is shifted so as to be greatly narrowed inward so that Δ becomes −0.3 mm, the VSWR characteristic shown in FIG. As shown in the Smith chart of FIG. 5B, the resonance frequency shifts further to the lower side, and the impedance changes greatly counterclockwise counterclockwise. FIG. 38 is a table showing changes in these resonance frequencies, fL is the lower resonance frequency of the two resonance frequencies of the antenna device, and fH is the higher resonance frequency of the two resonance frequencies. F0 is the average frequency of the two resonance frequencies. FIG. 39 is a graph of FIG. As is clear from FIG. 39, the resonance frequency increases as the one substantially U-shaped member on the right side of the dielectric base material 22 is shifted outward and the resonance frequency increases. The frequency will be low. Accordingly, the resonance frequency can be simplified by appropriately shifting one substantially U-shaped member on the right side of the dielectric base materials 22 and 22 in a direction orthogonal to the direction passing through the center p of the radiation electrode 14 and the power supply terminal 16. Can be adjusted. Moreover, the change in impedance changes in the opposite direction to that in the first embodiment.

  Furthermore, another adjustment method of the second embodiment will be described. FIG. 40 is a view of the radiation electrode 14 and the dielectric base materials 22 and 22 as viewed from above, and is substantially U-shaped for the dielectric base materials 22 and 22 whose positions are shifted in order to adjust the resonance frequency by other methods. The member of is shown. As shown in FIG. 40, two substantially U-shaped members of the dielectric base materials 22 and 22 in the direction orthogonal to the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16 (on the left side and the right side in FIG. 40). Are shifted by Δ / 2 in a direction orthogonal to the center position p of the radiation electrode 14 and the direction passing through the power supply terminal 16. The antenna characteristics when the reference shift dimension Δ is 0.0 mm are the same as those shown in FIG. When the two substantially U-shaped members on the upper and lower sides of the dielectric base materials 22 and 22 are shifted so as to expand outward so that Δ is 0.2 mm by 0.1 mm each, As shown in the VSWR characteristic diagram of FIG. 41 (a) and the Smith chart of (b), the resonance frequency shifts slightly higher and the impedance changes clockwise in a clockwise direction. Further, when the two substantially U-shaped members on the left and right sides of the dielectric base materials 22 and 22 are shifted so as to greatly expand outward so that Δ is 0.6 mm by 0.3 mm each, As shown in the VSWR characteristic diagram of (a) and the Smith chart of (b) shown in FIG. 42, the resonance frequency shifts to a higher side and the impedance changes greatly in the clockwise direction. Further, two substantially U-shaped members on the left and right sides of the dielectric base materials 22 and 22 are respectively opposite to each other in the direction orthogonal to the direction passing through the central position p of the radiation electrode 14 and the feeding terminal 16. When it is shifted by 0.1 mm so that Δ is narrowed inward by −0.2 mm, as shown in the VSWR characteristic diagram of FIG. 43 and the Smith chart of FIG. As the frequency shifts slightly lower, the impedance changes counterclockwise counterclockwise. Furthermore, when the two substantially U-shaped members on the left and right sides of the dielectric base materials 22 and 22 are shifted so as to be narrowed inward so that Δ is −0.6 mm by −0.3 mm each, As shown in the VSWR characteristic diagram of (a) and the Smith chart of (b) shown in FIG. 44, the resonance frequency shifts further to the lower side, and the impedance greatly changes counterclockwise counterclockwise. FIG. 45 is a table showing changes in these resonance frequencies, fL is the lower resonance frequency of the two resonance frequencies of the antenna device, and fH is the higher resonance frequency of the two resonance frequencies. F0 is the average frequency of the two resonance frequencies. FIG. 46 is a graph of FIG. As is clear from FIG. 46, the resonance frequency increases as the two substantially U-shaped members on the left and right sides of the dielectric base materials 22 and 22 are shifted outwardly to the outside, respectively, The resonance frequency becomes lower as the shift is made narrower. Accordingly, the two substantially U-shaped members on the left and right sides of the dielectric base materials 22 and 22 are appropriately shifted in a direction orthogonal to the direction passing through the central position p of the radiation electrode 14 and the power supply terminal 16 to thereby resonate. The frequency can be adjusted easily. Moreover, the change in impedance changes in the opposite direction to that in the first embodiment.

  In addition, the radiation electrode 14 of the antenna device used in the above-described embodiment has two corners opposed to one diagonal of a substantially rectangular shape slightly cut off in a chamfered shape, but is not limited thereto. One corner may be cut off slightly in a chamfered shape, and the diagonal direction of the radiation electrode 14 may be configured to be the current excitation direction.

It is an external appearance perspective view of the antenna apparatus used by 1st Example. In the first embodiment, the radiation electrode and the dielectric base material are viewed from above, and a substantially U-shaped member of the dielectric base material whose position is shifted in order to adjust the resonance frequency is shown. 2A and 2B show the antenna characteristics when the reference shift dimension Δ is 0.0 mm, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 2 shows the antenna characteristics when Δ is 0.1 mm by the adjustment of FIG. 2, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 2 shows the antenna characteristics when Δ is 0.3 mm by the adjustment of FIG. 2, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 2 shows antenna characteristics when Δ is −0.1 mm by the adjustment of FIG. 2, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 2 shows the antenna characteristics when Δ is −0.3 mm by the adjustment of FIG. 2, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. It is the table | surface which showed the change of the resonant frequency by adjustment of FIG. It is the figure which made the table | surface of FIG. 8 a graph. In the first embodiment, the radiation electrode and the dielectric base material are viewed from above, and the substantially U-shaped member of the dielectric base material that shifts the position to adjust the resonance frequency by another method is shown. FIG. 10 shows the antenna characteristics when the shift dimension Δ is 0.1 mm by adjustment according to another method of FIG. 10, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 10 shows the antenna characteristics when Δ is 0.3 mm by adjustment by another method of FIG. 10, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 10 shows the antenna characteristics when Δ is −0.1 mm by adjustment according to another method of FIG. 10, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 10 shows the antenna characteristics when Δ is −0.3 mm by adjustment according to another method of FIG. 10, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. 11 is a table showing changes in resonance frequency by adjustment by another method of FIG. 10. It is the figure which made the table | surface of FIG. 15 a graph. In the first embodiment, the radiation electrode and the dielectric base material are viewed from above, and the substantially U-shaped member of the dielectric base material that shifts the position in order to adjust the resonance frequency by another method is shown. FIG. 17 shows the antenna characteristics when the overall displacement Δ is 0.2 mm by adjustment by another method, FIG. 17A is a VSWR characteristic diagram, and FIG. 17B is a Smith chart. FIG. 17 shows the antenna characteristics when Δ is 0.6 mm by adjustment by another method, FIG. 17A is a VSWR characteristic diagram, and FIG. 17B is a Smith chart. FIG. 17 shows antenna characteristics when Δ is −0.2 mm by adjustment by another method, FIG. 17A is a VSWR characteristic diagram, and FIG. 17B is a Smith chart. FIG. 17 shows the antenna characteristics when Δ is −0.6 mm by adjustment by another method of FIG. 17, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. It is the table | surface which showed the change of the resonant frequency by adjustment by the other method of FIG. It is the figure which made the table | surface of FIG. 22 a graph. It is an external appearance perspective view of the antenna apparatus used by 2nd Example. In 2nd Example, it is the figure which looked at the radiation electrode and the dielectric base material from the top, and shows the substantially U-shaped member of the dielectric base material which shifts a position in order to adjust the resonance frequency. FIG. 25 shows the antenna characteristics when the reference shift dimension Δ is 0.0 mm, with (a) being a VSWR characteristic diagram and (b) being a Smith chart. 25 shows the antenna characteristics when Δ is 0.1 mm by adjustment in FIG. 25, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. 25 shows the antenna characteristics when Δ is 0.3 mm by the adjustment of FIG. 25, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. 25 shows the antenna characteristics when Δ is −0.1 mm by the adjustment of FIG. 25, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. 25 shows the antenna characteristics when Δ is −0.3 mm by the adjustment in FIG. 25, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. It is the table | surface which showed the change of the resonant frequency by adjustment of FIG. It is the figure which made the table | surface of FIG. 31 a graph. In 2nd Example, it is the figure which looked at the radiation electrode and the dielectric base material from the top, and shows the substantially U-shaped member of the dielectric base material which shifts a position in order to adjust the resonance frequency by another method. FIG. 33 shows the antenna characteristics when the shift dimension Δ is 0.1 mm by adjustment by another method of FIG. 33, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 33 shows the antenna characteristics when Δ is 0.3 mm by adjustment by another method of FIG. 33, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 33 shows antenna characteristics when Δ is −0.1 mm by adjustment by another method of FIG. 33, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. FIG. 33 shows antenna characteristics when Δ is −0.3 mm by adjustment by another method of FIG. 33, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. It is the table | surface which showed the change of the resonant frequency by adjustment by another method of FIG. It is the figure which made the table | surface of FIG. 38 a graph. In 2nd Example, it is the figure which looked at the radiation electrode and the dielectric base material from the top, and shows the substantially U-shaped member of the dielectric base material which shifts a position in order to adjust the resonance frequency by another method. 40 shows the antenna characteristics when the overall displacement Δ is 0.2 mm by adjustment by another method, FIG. 40A is a VSWR characteristic diagram, and FIG. 40B is a Smith chart. 40 shows antenna characteristics when Δ is 0.6 mm by adjustment by another method, FIG. 40A is a VSWR characteristic diagram, and FIG. 40B is a Smith chart. 40 shows the antenna characteristics when Δ is −0.2 mm by adjustment by another method, FIG. 40A is a VSWR characteristic diagram, and FIG. 40B is a Smith chart. 40 shows antenna characteristics when Δ is −0.6 mm by adjustment by another method of FIG. 40, (a) is a VSWR characteristic diagram, and (b) is a Smith chart. It is the table | surface which showed the change of the resonant frequency by adjustment by the other method of FIG. It is the figure which made the table | surface of FIG. 45 a graph. It is an external appearance perspective view of the conventional planar antenna apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Conductor base 12, 22 Dielectric base material 14 Radiation electrode 16 Feeding terminal p Center position

Claims (2)

On the conductor base as the GND electrode, the end is flat and has a substantially rectangular outer shape with an open space in the center, and is divided into two when viewed from above, and is opposed to two opposing substantially U-shapes. A dielectric base material is disposed with a space between the portions, and a substantially rectangular radiation electrode is disposed on the top surface of the dielectric base material so that the side thereof is substantially parallel to the side of the dielectric base material. Then, the peripheral portion of the radiation electrode is supported in an annular shape by the dielectric substrate, and one corner of the radiation electrode or two opposite corners are slightly cut off in a chamfered shape, and the diagonal direction of the radiation electrode Is provided so as to be shifted to one side from the central position of the radiation electrode so that the current excitation direction is in the direction of current excitation, and the two sides of the radiation electrode in the direction passing through the central position of the radiation electrode and the power supply terminal are provided. A substantially U-shaped dielectric base material is disposed so as to support it. In the antenna device, the arrangement position of the substantially U-shaped one or two members of the dielectric substrate with respect to the radiation electrode is shifted in a direction passing through the center position of the radiation electrode and the feeding terminal. A method for adjusting an antenna device, characterized by adjusting a resonance frequency. On the conductor base as the GND electrode, the end is flat and has a substantially rectangular outer shape with an open space in the center, and is divided into two when viewed from above, and is opposed to two opposing substantially U-shapes. A dielectric base material is disposed with a space between the portions, and a substantially rectangular radiation electrode is disposed on the top surface of the dielectric base material so that the side thereof is substantially parallel to the side of the dielectric base material. Then, the peripheral portion of the radiation electrode is supported in an annular shape by the dielectric substrate, and one corner of the radiation electrode or two opposite corners are slightly cut off in a chamfered shape, and the diagonal direction of the radiation electrode The feed terminal is provided so as to be shifted to one side from the center position of the radiation electrode so that is in the direction of current excitation, and the radiation in the direction perpendicular to the center position of the radiation electrode and the direction passing through the feed terminal. The front of the approximately U-shape to support the two sides of the electrode In the antenna device in which the dielectric base material is disposed, the disposition position of the substantially U-shaped one or two members of the dielectric base material with respect to the radiation electrode is defined as the center position of the radiation electrode and the A method for adjusting an antenna device, wherein the resonance frequency is adjusted by shifting in a direction orthogonal to a direction passing through a power supply terminal.