JP6132540B2 - Resonator and filter - Google Patents

Description

  The present invention relates to a resonator and a filter.

  As a conventional resonator using a transmission line with one end short-circuited and an open transmission line and a filter structure configured by arranging the resonators, there are a resonator and a filter using a hollow coaxial line (for example, see Patent Document 1). Moreover, a resonator and a filter using a hollow coaxial line and a resonator filled with a dielectric in the hollow portion of the filter (see, for example, Non-Patent Document 1), or a dielectric is locally disposed only around the signal line conductor. The structure about a resonator and a filter (for example, refer nonpatent literature 2) is also indicated.

U.S. Pat. No. 5,023,579

Christen Rauscher, “Design of Dielectric-Filled Cavity Filters With Ultrawide Stopband Characteristics,” IEEE Trans. Microw. Theory Tech., Vol. MTT-53, no. 5, pp. 1777-1786, May 2005. Joseph M Chuma and Dariush Mirshekar-Syahkal, “Compact Dielectric Loaded Combline Filter with Low Insertion-loss,” 30th European Microwave Conference, 2000.

  However, in the resonator shown in Patent Document 1, the gap between the open end of the coaxial resonator and the casing portion serving as the ground and the frequency adjusting screw having the same potential as the ground are close to each other in a hollow state. In this case, it is a problem to avoid discharge in the part. In particular, in applications used in vacuum, it is important to avoid multi-pactor discharge caused by electron transfer in vacuum, and ensure a certain gap between signal line conductors with different potentials and ground, or in the gap portion. It is necessary to take measures such as blocking the movement of electrons by interposing a dielectric.

  One method for solving the above problem is to employ a resonator filled with a dielectric as disclosed in Non-Patent Document 1. As a result, it is possible to eliminate a hollow and opposed gap, and avoid multi-pactor discharge. However, a new problem that the loss of the resonator and the filter increases due to the influence of the dielectric loss of the filled dielectric occurs, so that the reduction of the loss becomes a problem.

  As a configuration effective for loss reduction, there is a configuration in which a dielectric is locally disposed as shown in Non-Patent Document 2. In this configuration, by disposing no dielectric near the open end where the electric field is strong, it is possible to reduce the dielectric loss generated at the open end, and to reduce the loss of the resonator and the filter. However, a portion having a strong electric field means that the possibility of discharge is high, and the structure shown in Non-Patent Document 2 avoids discharge during high-power applications, as in the structure of Patent Document 1. It is a problem.

  As described above, in the prior art, there is a problem of coexistence of discharge avoidance at the time of high power use and reduction in loss of the resonator and the filter.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a resonator and a filter capable of achieving both discharge avoidance and low loss of the resonator and the filter when using high power. And

The resonator according to the present invention includes a ground conductor functioning as a ground, a signal line conductor having one end short-circuited to the ground conductor and the other end opened, and a space where the open end of the signal line conductor and the ground conductor face each other. A dielectric disposed in a part, and the dielectric includes a protruding structure disposed in contact with or spaced from the open end of the signal line conductor .

  According to the present invention, the dielectric is disposed in a part of the space where the open end and the ground conductor facing each other with high possibility of discharge, and the dielectric and the cavity region are mixed in the space. By blocking the movement of electrons, discharge avoidance in high power applications can be realized. Further, by providing the cavity region, it is possible to suppress the influence of the dielectric on the loss of the resonator. For this reason, it is possible to achieve both discharge avoidance at the time of high power use and low loss of the resonator and the filter.

It is a figure which shows the structure of the resonator and filter which concern on Embodiment 1 of this invention. It is a figure which shows the structure of the resonator and filter which concern on Embodiment 2 of this invention. It is a simulation result regarding a loss reduction effect. It is a figure which shows the structure of the resonator and filter which concern on Embodiment 3 of this invention. It is a figure which shows the structure of the resonator and filter which concern on Embodiment 4 of this invention. It is a figure which shows the structure of the resonator and filter which concern on Embodiment 5 of this invention. It is a figure which shows the structure of the resonator and filter which concern on Embodiment 6 of this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a structure of a resonator and a filter according to Embodiment 1 of the present invention. (A) is a sectional view about the BB plane in (b), (b) is a sectional view about the AA plane in (a), (c) is an exploded view of each component in (b), (d ) Is a detailed view of the dielectric part, and (e) is a detailed view of the cover conductor part.

  As shown in FIG. 1, the resonator and the filter according to the first embodiment include a metal casing 10, a signal line conductor 11, a cover conductor 20, and a dielectric 30. As shown in FIG. 1B, the resonator according to the first embodiment is a resonator using a distributed constant line with one end short-circuited and the other end open, and a signal line constituting the distributed constant line. The conductor 11 has a structure in which one end is short-circuited and the other end is opened.

The metal housing 10 functions as a ground conductor.
The signal line conductor 11 has a cylindrical shape, is electrically connected to the metal casing 10 at the short-circuit end 12, and is electrically isolated from both the metal casing 10 and the cover conductor 20 at the open end 13. It has become.
Note that the open end 13 refers to a portion near the open end of the signal line conductor 11, and will be described with reference to FIG. 1. The open end 13 is formed by the upper surface of the signal line conductor 11 and the side surface near the upper surface.

The cover conductor 20 functions as a ground conductor, like the metal housing 10.
As shown in FIG. 1 (e), the cover conductor 20 is provided with a hollow region 21 that is recessed in a columnar shape. In FIG. 1 (b) showing the assembled state of the above components, the signal line conductor 11 is shown. In this structure, the periphery of the open end 13 enters the cavity region 21.

  As shown in FIG. 1B, a dielectric 30 is disposed in a part of the space where the open end 13 and the cover conductor 20 that is a ground conductor face each other. Here, the cavity region 21 is divided into a cavity region 31 that is a region on the signal line conductor 11 side from the dielectric 30 and a cavity region 32 that is a region on the cover conductor 20 side from the dielectric 30.

  As shown in FIG. 1 (d), the dielectric 30 has a shape in which the central portion of the disk is recessed in a cylindrical shape, and a cylindrical protrusion 33 is formed at the center of the dielectric 30, and a collar is provided around the disk. Part 34. As shown in FIG. 1B, the collar portion 34 is in contact with the cover conductor 20 and the projection 33 is in contact with the open end portion 13 of the signal line conductor 11 or in close proximity with a minute gap. . Alternatively, the projection 33 may be placed in contact with the open end portion 13 of the signal line conductor 11 and the collar portion 34 may be in contact with the cover conductor 20 or close to the cover conductor 20 with a minute gap.

As shown in FIG. 1C, when the above-described component is provided so that the collar portion 34 and the cover conductor 20 are in contact with each other, first, the dielectric 30 is detachably fitted into the cover conductor 20. For this reason, the diameter of the portion to be fitted in the dielectric 30 is formed to be smaller than the diameter of the cavity region 21. At this time, by providing the collar portion 34, it is possible to limit the depth of fitting. Thereafter, the cover conductor 20 fitted with the dielectric 30 can be assembled so as to be electrically connected to the metal housing 10.
Alternatively, when the protrusion 33 and the open end 13 are provided so as to contact each other, the protrusion 30 is first brought into contact with the upper surface of the open end 13 to position the dielectric 30, and then the cover conductor 20 is electrically connected to the metal housing 10. Can be assembled. For this reason, the diameter of the portion of the dielectric 30 that enters the cavity region 21 is formed to be smaller than the diameter of the cavity region 21 so as to facilitate assembly.
The conduction between the cover conductor 20 and the metal housing 10 can be realized by conduction by screws, conduction by a conductive material, or the like.

  By arranging a plurality of resonators assembled in this way as shown in FIG. 1A and coupling them with a desired amount of coupling between the resonators, it is possible to resonate at a desired frequency and operate as a filter. As a method for realizing a desired amount of coupling between resonators, for example, a method of adjusting the size of the iris-shaped coupling hole 50 as shown in FIG. 1A or a method of adjusting the distance between the signal line conductors 11 is used. can do.

  There are comb line filters in which the short-circuit ends 12 are arranged on the same side with a plurality of resonators, and interdigital filters in which the short-circuit ends 12 are alternated between adjacent resonators. . In FIG. 1, a comb line filter will be described as an example. In the comb line filter, since the cover conductor 20 in FIG. 1 is on the same side, there is a feature that the component configuration is simplified compared to the interdigital filter.

In the resonator and filter structure according to the first embodiment shown in FIG. 1, an electric field is generated between the signal line conductor 11 and the metal casing 10 and the cover conductor 20 that are ground conductors at the resonance frequency, and the electric field strength. Becomes stronger in the vicinity of the open end 13.
As described above, since the vicinity of the open end 13 has entered the cavity region 21, the ground conductor located at the shortest distance from the signal line conductor 11 near the open end 13 becomes the cover conductor 20. A strong electric field is generated with a gap between the line conductor 11 and the cover conductor 20. In high-power applications and vacuum applications, it is important to avoid multi-pactor discharges caused by the movement of electrons in vacuum at sites where the electric field is strong.
According to the structure of the resonator and the filter according to the first embodiment shown in FIG. 1, the gap between the open end 13 of the signal line conductor 11 that generates a strong electric field and the cover conductor 20 is blocked by the dielectric 30. Therefore, it is possible to block the movement of electrons in the part and to avoid multi-pactor discharge.

  In the resonator and filter structure according to the first embodiment shown in FIG. 1, the electric field becomes strong near the open end 13 as described above, and the dielectric loss of the dielectric 30 arranged near the open end 13 is reduced. to be influenced. However, the space where the signal line conductor 11 and the cover conductor 20 face each other in the vicinity of the open end 13 has a structure in which the dielectric 30, the cavity region 31, and the cavity region 32 are mixed. Compared with the case where all 32 are filled with a dielectric, the influence of dielectric loss can be reduced. That is, the loss of the resonator and the filter can be reduced.

  As described above, the resonator and the filter according to the first embodiment can achieve both the avoidance of discharge at the time of high power use, which has been a conventional problem, and the reduction of the loss of the resonator and the filter.

In FIG. 1, the signal line conductor 11 has been described as a cylindrical structure with a uniform cross-sectional structure, but other structures may be used, and the cross-sectional structure in which the thickness of the signal line conductor 11 changes midway is one. An unstructured structure may be used. In addition, the open end portion 13 of the signal line conductor 11 has been described using a flat structure having a circular cross section, but it is also possible to use a rounded tip end.
The signal line conductor 11 and the metal casing 10 may have a structure in which the signal line conductor 11 and the metal casing 10 are short-circuited at the short-circuit end portion 12, and as shown in FIG. Good. Alternatively, a structure may be employed in which the signal line conductor 11 and the metal housing 10 are individually manufactured and made conductive during assembly.

  Although the method of dividing and assembling the cover conductor 20 serving as the ground conductor and the metal housing 10 in FIG. 1 has been described, the number of divisions may be any number. Further, the dividing plane may be selected at a position other than the position shown in FIG.

  In FIG. 1, the columnar cavity region has been described as the cavity region 21 provided in the cover conductor 20, but other structures such as a prism and a sphere may be used. Similarly, the structure of the dielectric 30 has been described as a shape in which a disk is recessed in a cylindrical shape in accordance with the structure of the cavity region 21, but other structures may be used.

Embodiment 2. FIG.
FIG. 2 is a diagram showing a structure of a resonator and a filter according to Embodiment 2 of the present invention. (A) is a sectional view about the BB plane in (b), (b) is a sectional view about the AA plane in (a), (c) is an exploded view of each component in (b), (d ) Is a detailed view of the dielectric part, and (e) is a detailed view of the cover conductor part.

The resonator and filter according to Embodiment 2 have a structure in which a screw hole 41 is provided in the cover conductor 20 as shown in FIG. Then, as shown in FIGS. 2B and 2C, the metal screw 40 is inserted into the screw hole 41, and the metal screw end portion 42 that is the end portion of the metal screw 40 is inserted into the cavity region 21. It has a structure. Further, as shown in FIG. 2D, the protrusion 33 provided in a columnar shape on the dielectric 30 has a structure having a hollow region 35 that penetrates the protrusion 33.
In FIG. 2, the metal screw 40 has a columnar structure and the cavity region 35 has a cylindrical structure, and the diameter of the metal screw 40 is smaller than the diameter of the cavity region 35.

  Other structures are the same as those in the first embodiment, and the description thereof is omitted.

  In FIG. 2, since the metal screw 40 is electrically connected to the cover conductor 20, the metal screw 40 functions as a ground conductor. For this reason, a capacitance between the signal line conductor and the ground conductor is generated between the metal screw end portion 42 and the open end portion 13. Since the capacitance is a value that determines the resonance frequency of the resonator, the resonance frequency of the resonator can be adjusted by changing the position of the metal screw end 42, that is, the insertion length of the metal screw 40. Therefore, the metal screw 40 functions as a resonance frequency adjusting conductor.

As described above, since a signal line conductor-ground conductor capacitance is generated between the metal screw end portion 42 and the open end portion 13, the portion becomes a region where the electric field becomes strong.
Here, according to the structure of the resonator and the filter according to the second embodiment shown in FIG. 2, the dielectric 30 forms the gap between the signal line conductor 11 and the metal screw end 42 in the portion where a strong electric field is generated. Since the structure is cut off, the movement of electrons in the part is cut off, and multi-pactor discharge can be avoided as in the resonator and the filter according to the first embodiment.
Further, as described in the first embodiment, the portion is greatly affected by the dielectric loss of the dielectric 30. Here, according to the structure shown in FIG. 2, the cavity region 35 is not provided because the cavity region 35 is formed through the dielectric in the region where the metal screw end 42 and the open end 13 face each other. The dielectric occupancy is lower than that of the structure. Therefore, the influence of the dielectric loss in the cavity region 35 can be avoided, and the loss of the resonator and the filter can be reduced.

  FIG. 3 shows the result of a simulation performed to confirm the loss reduction effect by providing the cavity region 35. The unloaded Q value, which is an index of loss for the resonator and filter, was calculated by simulation. For the simulation, a three-dimensional electromagnetic field simulation by a finite element method was used.

  In FIG. 3, # 1 is a structure (hollow structure) from which the dielectric 30 is removed in FIG. 2, # 2 is the structure of the second embodiment shown in FIG. 2, and # 3 is a dielectric in the cavity region 35 in FIG. The filled structure, # 4, shows the simulation result of the unloaded Q value in the structure in which both the cavity region 35 and the cavity region 31 are filled with a dielectric in FIG. In the simulation, the conductivity of the metal part was set to a silver conductivity of 6.1 × 10 7 S / m, and the dielectric material constant was set to a relative dielectric constant of 2.1 and a dielectric loss tangent of 0.001.

3 that the hollow structure of # 1 has the highest unloaded Q value 6232 and the lowest loss filter can be configured. On the other hand, in the # 4 structure in which the vicinity of the open end 13 is filled with the dielectric, the unloaded Q value is reduced to 1380. This is a reduction of 78% in terms of the reduction rate from the hollow structure of # 1, and it can be seen that the loss of the filter is greatly increased.
When the structure of # 3, which is a structure in which the cavity region 35 is filled with a dielectric and the cavity region 31 is a cavity, is adopted, the decrease rate of the unloaded Q value from the # 1 hollow structure is improved to 41%, Further, in the # 2 structure in which the hollow region 35 between the metal screw end portion 42 and the open end portion 13 is also hollow, the reduction rate of the unloaded Q value from the # 1 hollow structure is suppressed to 32%. be able to.
As described above, according to the structure of the second embodiment, it is possible to confirm the effect of reducing the influence of the dielectric loss and reducing the loss of the resonator and the filter.

  As described above, the resonator and the filter according to the second embodiment can reduce the dielectric loss in the vicinity of the screw end that adjusts the resonance frequency in addition to the effects of the first embodiment.

  Although the example in which the metal screw 40 has a cylindrical structure has been described with reference to FIG. 2, other structures may be used, and a structure in which the cross-sectional structure is not uniform so that the thickness of the metal screw 40 changes in the middle may be used. Good. The shape of the hollow region 35 has also been described by taking the cylindrical structure as an example, but other structures may be used.

  Although the structure in which the cross-sectional size of the metal screw 40 is smaller than the cross-sectional size of the cavity region 35 has been described with reference to FIG. 2, the magnitude relationship may be the same or opposite.

Further, the metal screw 40 and the screw hole 41 are not screw structures but are metal members having a hole and a cross section having the same shape as the hole, and the insertion length can be changed by providing a catch such as a collar portion on the metal member. You may design as follows.
In addition to metals, other materials (such as conductive polymers) may be used as long as they function as conductors.

Embodiment 3 FIG.
FIG. 4 is a diagram showing the structure of the resonator and filter according to Embodiment 3 of the present invention. (A) is a sectional view about the BB plane in (b), (b) is a sectional view about the AA plane in (a), (c) is an exploded view of each component in (b), (d ) Is a detailed view of the dielectric part, and (e) is a detailed view of the cover conductor part.

4 has a structure in which the protrusion 33 of the dielectric 30 is removed from the resonator and filter according to the first embodiment shown in FIG.
Other structures are the same as those in the first embodiment, and the description thereof is omitted.

According to the structure of FIG. 4, the dielectric 30 is provided between the open end 13 of the signal line conductor 11 that generates a strong electric field and the cover conductor 20, similarly to the resonator and filter according to Embodiment 1 shown in FIG. 1. Therefore, the movement of electrons in the part can be blocked and multi-pactor discharge can be avoided.
Further, according to the structure of FIG. 4, since the influence of the dielectric loss due to the protrusion 33 can be eliminated by removing the protrusion 33 shown in FIG. 1, the resonator is further compared with the structure of FIG. And loss of the filter can be reduced.

  In the structure of FIG. 1, since the protrusion 33 is arranged in contact with or close to the open end portion 13, the dielectric 30 is easily fixed. However, in FIG. 4, since the protrusion 33 is not provided, It is necessary to fix the dielectric 30 separately. As a fixing method, there are a method of press-fitting the dielectric 30 into the cover conductor 20, a method of bonding the dielectric 30 to the cover conductor 20 with an adhesive, a method of screwing the dielectric 30 to the cover conductor 20, and the like. An arbitrary position may be selected as the bonding position, and a method of bonding only the collar portion 34 may be employed. The same applies to the screwing locations. For example, a method of screwing the collar portion 34 to the cover conductor 20 may be adopted.

  Moreover, it is good also as a structure which provided the metal screw 40 demonstrated in Embodiment 2. FIG. In this case, as a hollow region corresponding to the hollow region 35 described in the second embodiment, the thickness of the dielectric portion in the region where the metal screw 40 and the open end portion 13 of the dielectric 30 face each other is reduced. A hollow region may be provided. By providing such a cavity region, the dielectric occupancy can be reduced as compared with a structure in which the cavity region is not provided.

  As described above, the resonator and the filter according to the third embodiment can further reduce the loss of the resonator and the filter in addition to the effects of the first embodiment.

Embodiment 4 FIG.
FIG. 5 is a diagram showing a structure of a resonator and a filter according to Embodiment 4 of the present invention. (A) is a sectional view about the BB plane in (b), (b) is a sectional view about the AA plane in (a), (c) is an exploded view of each component in (b), (d ) Is a detailed view of the dielectric part, and (e) is a detailed view of the cover conductor part.

5, the shapes of the resonator 30 and the dielectric 30 of the filter in the first embodiment shown in FIG. 1 are different. Specifically, in FIG. 1, the structure is fitted into the cover conductor 20, whereas in FIG. 5, the structure is fitted into the open end 13 of the signal line conductor 11.
Other structures are the same as those in the first embodiment, and the description thereof is omitted.

  As shown in FIG. 5, the dielectric 30 according to the fourth embodiment has a cylindrical shape with a hollow inside and one bottom surface as an opening, and the inner diameter is larger than the diameter of the signal line conductor 11. The signal line conductor 11 is formed so as to cover the open end 13 of the signal line conductor 11. By adopting such a structure, the structure can be simplified and miniaturized as compared with the dielectric 30 shown in FIG.

  Further, according to the structure of FIG. 5, the dielectric between the open end 13 of the signal line conductor 11 that generates a strong electric field and the cover conductor 20 is the same as in the resonator and filter according to the first embodiment shown in FIG. Since the structure is blocked by the body 30, movement of electrons in the part can be blocked, and multi-pactor discharge can be avoided.

  Further, according to the structure of FIG. 5, the space where the signal line conductor 11 and the cover conductor 20 face each other in the vicinity of the open end 13 has a structure in which the dielectric 30 and the cavity region are mixed. Compared with the case where the dielectric is filled, the influence of the dielectric loss can be reduced. That is, similarly to the resonator and the filter according to the first embodiment, the loss of the resonator and the filter can be reduced.

In the structure of FIG. 5, since the dielectric 30 is only in contact with the open end portion 13, it is necessary to fix the dielectric 30 separately as in the third embodiment. As a fixing method, there are a method of press-fitting the signal line conductor 11 into the dielectric 30, a method of bonding the dielectric 30 to the signal line conductor 11 with an adhesive, a method of screwing the dielectric 30 to the signal line conductor 11, and the like. . Arbitrary locations may be selected for locations to be bonded and screw locations.
Further, by using the dielectric 30 formed so that the inner diameter is larger than the fitting degree than the outer diameter of the open end portion 13, the press-fitting location, the adhesion location, the screwing location, and the like other than the open end portion 13 of the signal line conductor 11. The dielectric 30 may be provided close to the open end 13 with a minute gap.

  Moreover, it is good also as a structure which provided the metal screw 40 demonstrated in Embodiment 2. FIG. In this case, as a hollow region corresponding to the hollow region 35 described in the second embodiment, the thickness of the dielectric portion in the region where the metal screw 40 and the open end portion 13 of the dielectric 30 face each other is reduced. A hollow region may be provided. By providing such a cavity region, the dielectric occupancy can be reduced as compared with a structure in which the cavity region is not provided.

  As described above, the resonator and the filter according to the fourth embodiment can simplify and reduce the component configuration of the resonator and the filter in addition to the effects of the first embodiment.

Embodiment 5. FIG.
FIG. 6 is a diagram showing the structure of the resonator and the filter according to the fifth embodiment of the present invention. (A) is a sectional view about the BB plane in (b), (b) is a sectional view about the AA plane in (a), (c) is an exploded view of each component in (b), (d ) Is a detailed view of the dielectric part, and (e) is a detailed view of the cover conductor part.

In FIG. 6, the cover conductor 20 of the resonator and the filter in the first embodiment shown in FIG. 1 is changed to a flat plate structure without a hollow region. Further, by reducing the height of the signal line conductor 11 compared to the height of the metal casing 10, the open end 13 and the cover conductor 20 are in contact with each other when the cover conductor 20 has a flat plate structure. The structure has been avoided. The dielectric 30 is the same as that of the fourth embodiment shown in FIG.
Other structures are the same as those in the fourth embodiment, and a description thereof will be omitted.

  As shown in FIG. 6, the cover conductor 20 in the fifth embodiment has a flat plate structure, and the structure can be simplified as compared with the cover conductor 20 shown in FIG.

  Further, according to the structure of FIG. 6, the dielectric between the open end 13 of the signal line conductor 11 that generates a strong electric field and the cover conductor 20 is dielectric like the resonator and the filter according to the first embodiment shown in FIG. 1. Since the structure is blocked by the body 30, movement of electrons in the part can be blocked, and multi-pactor discharge can be avoided.

  Further, according to the structure of FIG. 6, the space where the signal line conductor 11 and the cover conductor 20 face each other in the vicinity of the open end 13 has a structure in which the dielectric 30 and the cavity region are mixed. Compared with the case where the dielectric is filled, the influence of the dielectric loss can be reduced. That is, similarly to the resonator and the filter according to the first embodiment, the loss of the resonator and the filter can be reduced.

  Since dielectric 30 is the same as dielectric 30 in the fourth embodiment, the positioning method and the like are the same as those described in the fourth embodiment.

  In FIG. 6, it is good also as a structure which provided the metal screw 40 demonstrated in Embodiment 2. FIG. In this case, as a hollow region corresponding to the hollow region 35 described in the second embodiment, the thickness of the dielectric portion in the region where the metal screw 40 and the open end portion 13 of the dielectric 30 face each other is reduced. A hollow region may be provided. By providing such a cavity region, the dielectric occupancy can be reduced as compared with a structure in which the cavity region is not provided.

  As described above, the resonator and the filter according to the fifth embodiment can simplify the component configuration of the resonator and the filter in addition to the effects of the first embodiment.

Embodiment 6 FIG.
FIG. 7 is a diagram showing a structure of a resonator and a filter according to the sixth embodiment of the present invention. (A) is a sectional view about the BB plane in (b), (b) is a sectional view about the AA plane in (a), (c) is an exploded view of each component in (b), (d ) Is a detailed view of the dielectric part, and (e) is a detailed view of the cover conductor part.

7 has a structure in which the dielectric 30 in the fifth embodiment shown in FIG. 6 is attached to the cover conductor 20 side, for example. If the inner diameter of the dielectric 30 is formed to be larger than the diameter of the signal line conductor 11 like the inner diameter in the fifth embodiment, the central axis of the dielectric 30 and the central axis of the signal line conductor 11 during assembly As a result, the inner diameter of the dielectric 30 in the sixth embodiment is larger than that of the structure shown in FIG.
Other structures are the same as those of the fifth embodiment, and the description thereof is omitted.

  The structure shown in FIG. 7 makes it possible to simplify the structure of the cover conductor 20 in a flat plate shape as described in the fifth embodiment.

  Further, according to the structure of FIG. 7, the dielectric between the open end 13 of the signal line conductor 11 that generates a strong electric field and the cover conductor 20 is the same as the resonator and filter according to the first embodiment shown in FIG. Since the structure is blocked by the body 30, movement of electrons in the part can be blocked, and multi-pactor discharge can be avoided.

  Further, according to the structure of FIG. 7, the space where the signal line conductor 11 and the cover conductor 20 face each other in the vicinity of the open end 13 has a structure in which the dielectric 30 and the cavity region are mixed. Compared with the case where the dielectric is filled, the influence of the dielectric loss can be reduced. That is, similarly to the resonator and the filter according to the first embodiment, the loss of the resonator and the filter can be reduced.

  The method of fixing the dielectric 30 to the cover conductor 20 is the same as the method described in Embodiment 3 in which the dielectric 30 is fixed to the cover conductor 20.

In FIG. 7, since the dielectric 30 and the cover conductor 20 are in contact with each other, when the metal screw 40 functioning as the resonance frequency adjusting conductor as shown in the second embodiment is employed, the cover conductor 20 It is necessary to provide a gap for arranging the metal screw 40 between the dielectric 30 and the dielectric 30. For example, the gap 30 may be separately provided in the dielectric 30.
Further, in this case, as a hollow region corresponding to the hollow region 35 described in the second embodiment, the thickness of the dielectric portion in the region where the metal screw 40 and the open end portion 13 of the dielectric 30 face each other is reduced. Further, a hollow region may be provided. By providing such a cavity region, the dielectric occupancy can be reduced as compared with a structure in which the cavity region is not provided.

  As described above, the resonator and the filter according to the sixth embodiment can simplify the component configuration of the resonator and the filter in addition to the effects of the first embodiment.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  DESCRIPTION OF SYMBOLS 10 Metal housing | casing, 11 Signal line conductor, 12 Short-circuit end part, 13 Open end part, 20 Cover conductor, 21 Cavity area, 30 Dielectric, 31 Cavity area, 32 Cavity area, 33 Protrusion, 34 Brim part, 35 Cavity area , 40 metal screws, 41 screw holes, 42 metal screw ends, 50 iris-like coupling holes.

Claims (12)

A ground conductor that functions as a ground;
A signal line conductor having one end short-circuited to the ground conductor and the other end opened;
A dielectric disposed in a part of a space where the open end of the signal line conductor and the ground conductor face each other ;
The resonator includes a protrusion-like structure disposed in contact with or spaced from an open end portion of the signal line conductor . A ground conductor that functions as a ground;
A signal line conductor having one end short-circuited to the ground conductor and the other end opened;
A dielectric disposed in a part of a space where the open end of the signal line conductor and the ground conductor face each other ;
The resonator has a collar-like structure in a direction perpendicular to an attachment direction, and is a resonator that is detachably fitted in a recess of the ground conductor . A ground conductor that functions as a ground;
A signal line conductor having one end short-circuited to the ground conductor and the other end opened;
A dielectric disposed in a part of a space where the open end of the signal line conductor and the ground conductor face each other ;
The ground conductor includes a resonance frequency adjusting conductor,
The dielectric includes a cavity region in a region where the resonance frequency adjusting conductor and the open end of the signal line conductor face each other . The resonator according to any one of claims 1 to 3, wherein the ground conductor has a concave portion that is recessed in a direction opposite to the open end portion at a position facing the open end portion of the signal line conductor. . The resonator according to claim 3 , wherein the dielectric is disposed in contact with or spaced from at least one of the ground conductor and the open end of the signal line conductor. The resonator according to claim 2, 3, or 5, wherein the dielectric includes a protruding structure disposed in contact with or spaced from an open end portion of the signal line conductor. Said dielectric is provided with a collar-like structure to the mounting direction perpendicular to the direction, the resonator according to removably claim 1 or claim 3 or claim 5 is fitted into the concave portion of the ground conductor. The ground conductor, resonator according to claim 1 or claim 2 comprising a resonant frequency adjusting conductor. The resonator according to claim 8 , wherein the dielectric includes a hollow region in a region where the resonance frequency adjusting conductor and the open end of the signal line conductor face each other. The protruding structure of the dielectric includes a hollow region inside,
The ground conductor, resonator according to claim 1 or claim 6 comprising a resonant frequency adjusting conductor on the back opposed to the position of the protruding structure of the dielectric. 2. The ground conductor is formed of a first ground conductor including a short-circuit end portion of the signal line conductor and at least one second ground conductor not including a short-circuit portion of the signal line conductor. The resonator according to claim 10 . A filter configured by arranging a plurality of resonators according to any one of claims 1 to 11 .

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