JP6310097B2 - transceiver - Google Patents

Description

  The present invention relates to a radio apparatus including a metal part and an antenna that are separated by a gap on the outer periphery.

  In order to improve communication characteristics in a wireless device capable of transmitting and receiving information, a technique has been proposed in which a metal is used for a casing of the wireless device and wireless communication is performed using a part of the metal as an antenna.

  For example, Patent Document 1 discloses an electronic device including a peripheral conductive housing member in which a gap is formed. In the electronic device, the peripheral conductive housing member includes a portion connected to the ground plane and a portion that operates as an antenna and is not connected to the ground plane, and is connected to the ground plane. A gap is formed between the portion and the portion that operates as an antenna.

Japanese Patent Gazette “Special Table 2014-508440 (April 3, 2014)”

  However, in the conventional technology as described above, when the user grips the electronic device, the finger touches the gap, and the portion connected to the ground plane and the portion operating as the antenna are connected at a high frequency. There is a problem that the characteristics change.

  The present invention has been made in view of the above problems, and in a wireless device including a metal part and an antenna that are separated by a first gap on the outer periphery, the metal part and the antenna are connected in a high frequency manner. Another object of the present invention is to provide a radio that suppresses the influence of the antenna on the antenna characteristics.

  In order to solve the above-described problem, a wireless device according to one embodiment of the present invention includes a metal portion and a first antenna that are separated by a first gap on an outer periphery, and the metal portion is The end of the metal part on the first gap side has a high impedance with respect to the ground at the communication frequency of the first antenna.

  According to one aspect of the present invention, in a wireless device having a gap separating the metal part and the antenna on the outer periphery, even if the metal part and the antenna are connected at a high frequency, the influence on the antenna characteristics of the antenna is suppressed. Can do.

It is the schematic which shows the structure of the radio | wireless machine which concerns on Embodiment 1 of this invention. (A) is the schematic which shows the structure of the modification 1 of the radio apparatus which concerns on Embodiment 1 of this invention, (b) is the structure of the modification 2 of the radio apparatus which concerns on Embodiment 1 of this invention. FIG. It is the schematic which shows the structure of the radio | wireless machine which concerns on Embodiment 2 of this invention. It is the schematic which shows the structure of the radio | wireless machine which concerns on Embodiment 3 of this invention. (A) is the schematic which shows the structure of the modification 3 of the radio apparatus which concerns on Embodiment 3 of this invention, (b) is the structure of the modification 4 of the radio apparatus which concerns on Embodiment 3 of this invention. FIG. It is the schematic which shows the structure of the radio | wireless machine which concerns on Embodiment 4 of this invention. It is the schematic which shows an example of the structure of the antenna in Embodiment 5 of this invention, (b) is the schematic which shows the other example of the structure of the antenna in Embodiment 5 of this invention, (c) is It is the schematic which shows the further another example of the structure of the antenna in Embodiment 5 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. For convenience of explanation, members having the same functions as those shown in each embodiment are given the same reference numerals, and the description thereof is omitted as appropriate.

  In this specification, a wireless device is a device that a user can operate with a hand and has a communication function using a wireless signal, and a mobile phone, a smartphone, or a tablet terminal is used as an example. The wireless device according to the present invention is not limited to these. For example, a stationary wireless LAN base unit may be used.

Embodiment 1
FIG. 1 is a schematic diagram showing a configuration of a wireless device 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, the wireless device 1 includes a metal part 10, an antenna (first antenna) 20, a slit (first gap) 30, a slit 31, a power feeding part 40, an inductor 50, and a GND 60. .

  The wireless device 1 has a slit 30 and a slit 31 that divide into a metal part 10 and an antenna 20 on the outer periphery. In this specification, the “outer periphery” refers to a surrounding area along the outside of the wireless device 1. In particular, in the present embodiment, the metal part 10 and the antenna 20 are arranged along the outer periphery. The metal unit 10 and the antenna 20 may be the casing of the radio device 1 or may constitute at least a part of the casing of the radio device 1. As an example in which the metal part 10 and the antenna 20 constitute at least a part of the housing of the wireless device 1, a structure formed by sandwiching the metal part 10 and the antenna 20 between two resin molded products is defined as the housing. The structure to do is mentioned. In addition, a housing | casing points out the member which stores the electronic component with which the radio | wireless machine 1 is provided.

  The metal part 10 is connected to the GND 60 at a position where the length to the end on the slit 30 side of the metal part 10 is a length L (hereinafter, the position connected to the GND 60 in the metal part 10 is a ground connection point P). Called). The ground connection point P may be configured such that other components (for example, a USB connector) are also connected to the GND 60 together with the metal portion 10. A specific value of the length L will be described later.

  The antenna 20 is fed by the feeding unit 40 and can transmit and receive radio signals. The antenna 20 is connected to the GND 60 via the inductor 50 in the vicinity of the slit 30 and operates in a ½ wavelength system of the communication frequency of the antenna 20. However, the feeding position and ground position of the antenna 20 are not limited. Further, the antenna 20 may be an antenna that operates in a 1/4 wavelength (λ / 4) system with an open tip, or may be an inverted F antenna that is short-circuited in the middle, and the antenna system is not limited. .

  The slit 30 and the slit 31 are provided so as to separate the metal part 10 and the antenna 20. The slit 30 and the slit 31 are preferably provided so that the capacitance between the metal part 10 and the antenna 20 is 1 pF or less so as not to be capacitively coupled. It should be noted that at least one slit that separates the metal part 10 and the antenna 20 may be provided.

  The GND 60 indicates a ground to which the metal unit 10 and the antenna 20 are connected. For example, the GND 60 may be a ground of a circuit board (not shown) disposed inside the wireless device 1, but the shape of the GND 60 is It is not limited to the shape shown in FIG.

(Length L)
When the wavelength of the radio signal transmitted and received by the antenna 20 is λ, the electrical length of the length L is preferably (2n−1) λ / 8 to (2n + 1) λ / 8 (n is an odd natural number). In particular, the electrical length of the length L is preferably λ / 8 to 3λ / 8 when n = 1, and more preferably λ / 4. In this case, for example, even if the slit 30 is closed with a finger and the metal part 10 and the antenna 20 are connected in high frequency, the metal part 10 has a high impedance that is substantially open to the GND 60 at the position of the slit 30.

  As described above, the wireless device 1 according to the present embodiment includes the metal part 10 and the antenna 20 that are separated by the slit 30 on the outer periphery, and the metal part 10 is located on the slit 30 side of the metal part 10. The terminal has a high impedance with respect to the communication frequency of the antenna 20. Therefore, even if the metal part 10 and the antenna 20 are connected at a high frequency, the end on the slit 30 side of the metal part 10 does not appear to be almost GND with respect to the antenna 20, so that the antenna characteristics of the antenna 20 are affected. Can be suppressed.

  In addition, the metal part 10 is connected to the GND 60 at a ground connection point P such that the end of the metal part 10 on the slit 30 side has a high impedance with respect to the GND 60 at the communication frequency of the antenna 20. Therefore, the end of the metal part 10 on the slit 30 side can be suitably made high impedance.

  The metal part 10 is connected to the GND 60 at a position of a length L where the electrical length is (2n−1) λ / 8 to (2n + 1) λ / 8 (n is an odd natural number). For this reason, even when the metal part 10 and the antenna 20 are connected in a high frequency manner, the end of the metal part 10 on the slit 30 side of the antenna 20 does not appear to be almost GND. Can be suitably suppressed.

[Modification 1]
Modification 1 will be described with reference to FIG. FIG. 2A is a schematic diagram illustrating a configuration of Modification 1 of the wireless device 1 according to the first embodiment.

  For example, when the metal part 10 is shorter than １ ／ of the wavelength of the communication frequency of the antenna 20, as described above, L = (2n−1) λ / 8˜ ( 2n + 1) cannot be connected to the GND 60 at a position of λ / 8 (n is an odd natural number). In this case, even if the metal part 10 and the antenna 20 are connected at high frequency by connecting the metal part 10 to the GND 60 via the reactance element at the ground connection point P, the metal part 10 is slit. A high impedance can be made with respect to the GND 60 at 30 positions.

  For example, as shown in FIG. 2A, the metal part 10 is connected to the GND 60 via the inductor (reactance element) 51 at the ground connection point P. With this configuration, even when the length L from the slit 30 is shorter than 1/8 of the wavelength of the communication frequency band of the antenna 20, the electrical length at the length L of the metal portion 10 is suitably changed. be able to.

  As described above, the wireless device 1 according to this modification further includes the inductor 51, and the metal part 10 is connected to the GND 60 via the inductor 51. Therefore, regardless of the length of the metal part 10, even if the metal part 10 and the antenna 20 are connected at a high frequency, the end of the metal part 10 on the slit 30 side is almost GND with respect to the antenna 20. Since it cannot be seen, the influence on the antenna characteristics of the antenna 20 can be suppressed.

  In addition, although the case where the metal part 10 was shorter than 1/8 length of the wavelength of the communication frequency of the antenna 20 was mentioned as an example, this modification is not limited to this case. For example, even when the metal portion 10 is longer than １ ／ of the wavelength of the communication frequency of the antenna 20, the electrical length from the end on the slit 30 side of the metal portion 10 to the ground connection point P is optimally adjusted. Therefore, the metal part 10 may be connected to the GND 60 via a reactance element corresponding to a capacitive capacitor. This configuration can also be applied to other embodiments and modifications.

[Modification 2]
A second modification of the first embodiment will be described with reference to FIG. FIG. 2B is a schematic diagram illustrating a configuration of the wireless device 1 according to the second modification of the first embodiment.

  For example, when the metal part 10 is shorter than 1/8 of the wavelength of the communication frequency of the antenna 20, the planar metal part 10 that is disposed on the outer periphery and covers the inside of the wireless device 1 is disposed. For example, as shown in FIG. 2 (b), when the metal part 10 covering the inside of the wireless device 1 has a planar shape, it is located at a position other than the outer periphery of the wireless device 1 and is the end on the slit 30 side. To the ground connection point P.

  As described above, the wireless device 1 according to this modification includes the planar metal portion 10 that covers the inside of the wireless device 1, and the metal portion 10 is connected to the GND 60 at a position other than the outer periphery. Therefore, in the configuration in which the ground connection point P cannot be provided on the outer periphery of the radio device 1, even if the metal part 10 and the antenna 20 are connected at a high frequency, the slit of the metal part 10 with respect to the antenna 20. Since the terminal on the 30th side is hardly visible as GND, the influence on the antenna characteristics of the antenna 20 can be suppressed.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. FIG. 3 is a schematic diagram showing the configuration of the wireless device 1a according to the second embodiment of the present invention. In the present embodiment, the antenna 20 can transmit and receive a radio signal using a plurality of communication frequencies different from each other.

  When the antenna 20 transmits and receives radio signals using a plurality of different communication frequencies, the electrical length from the end of the metal part 10 on the slit 30 side is (2n−1) λ / 8 to A connection is made to the GND 60 at a position having a length of (2n + 1) λ / 8 (n is an odd natural number). For example, when the antenna 20 communicates at the communication frequency f1 and the communication frequency f2, the length that becomes an electrical length that is ¼ of the wavelength of the communication frequency f1 is the length L1, and the electrical that is ¼ of the wavelength of the communication frequency f2 The length that becomes the length is defined as length L2. In this case, at a position (ground connection point P1) that is a length L1 away from the end of the metal portion 10 on the slit 30 side, the metal portion 10 is high-frequency connected to the GND 60 at the communication frequency f1, and is further separated from the slit 30 by the length L2. At the position (ground connection point P2), the metal part 10 is connected to the GND 60 by high frequency at the communication frequency f2. With this configuration, even when the metal part 10 and the antenna 20 are connected at a high frequency, the metal part 10 has high impedance with respect to the GND 60 at each of the communication frequency f1 and the communication frequency f2 at the end on the slit 30 side.

  Thus, in the wireless device 1a according to the present embodiment, the antenna 20 performs wireless communication at a plurality of different communication frequencies. The metal part 10 is connected to the GND 60 at a connection position where the end of the metal part 10 on the slit 30 side has a high impedance with respect to the GND 60 at each of the plurality of different frequencies. Therefore, in the configuration in which the antenna 20 transmits and receives radio signals using a plurality of communication frequencies, even when the metal unit 10 and the antenna 20 are connected at a high frequency, the metal unit 10 is connected to the antenna 20. Since the end on the slit 30 side does not look almost GND, the influence on the antenna characteristics of the antenna 20 can be suppressed.

  Further, as shown in FIG. 3, the ground connection point P1 and the ground connection point P2 may be connected to the GND 60 via a filter 52 and a filter 53 that pass only a desired frequency, respectively. Moreover, it may replace with a filter and the structure connected to GND60 through the switch for letting only a desired frequency pass.

[Embodiment 3]
The following will describe another embodiment of the present invention with reference to FIG. FIG. 4 is a schematic diagram illustrating a configuration of a wireless device 1b according to the third embodiment of the present invention. In the present embodiment, the wireless device 1b includes two antennas.

  In addition to the configuration of the wireless device 1 in the first embodiment, the wireless device 1b further includes an antenna 21 that is separated from the metal part 10 by a slit (second gap) 32 on the outer periphery, as shown in FIG. ing. The antenna 20 is fed with an antenna by a feeding unit 40, and the antenna 21 is fed with an antenna by a feeding unit 41, and transmits and receives a radio signal using the same communication frequency.

  First, as in the above-described embodiment, as shown in FIG. 4, the position of the length L that is an electrical length of ¼ of the wavelength of the communication frequency of the antenna 20 from the end on the slit 30 side of the metal portion 10 (ground At the connection point P3), the metal part 10 is connected to the GND 60. With this configuration, even when the metal part 10 and the antenna 20 are connected in a high frequency manner, the influence on the antenna characteristics of the antenna 20 can be suppressed.

  On the other hand, when the antenna 21 and the metal part 10 are connected at a high frequency, a current flows from the antenna 21 to the metal part 10, which affects the antenna characteristics of the antenna 21. Therefore, the metal part 10 is connected to the GND 60 from the end of the metal part 10 on the slit 32 side at a position (ground connection point P4) having a length L that is ¼ of the wavelength of the communication frequency of the antenna 21. .

  Thus, in addition to the configuration of the wireless device 1 described above, the wireless device 1b according to the present embodiment is a slit 32 on the outer periphery, and is separated from the metal part 10 by a slit 32 different from the slit 30. The metal part 10 is connected to the GND 60 at a connection position where the end of the metal part 10 on the slit 32 side has a high impedance with respect to the GND 60 at the communication frequency of the antenna 21. Therefore, even when the metal part 10 and the antenna 21 are connected in a high frequency manner, the influence on the antenna characteristics of the antenna 21 can be suppressed. That is, even when at least one of the antenna 20 and the antenna 21 and the metal part 10 are connected at a high frequency, the influence on the antenna characteristics of the antenna 20 and the antenna 21 can be suppressed.

  When the position of the length L from the end of the metal portion 10 on the slit 30 side and the position of the length L from the end of the metal portion 10 on the slit 32 side coincide with each other, the position is connected to the ground connection point P3 and the ground connection. The structure shared as the point P4 may be sufficient.

[Modification 3]
Modification 3 will be described with reference to FIG. FIG. 5A is a schematic diagram illustrating a configuration of Modification 3 of the wireless device 1b according to the third embodiment.

  For example, when the metal part 10 is short and cannot be connected to the GND at a position that is 1/8 of the wavelength of the communication frequency of the antenna 20 and the antenna 21 from the end on the slit 30 side, the reactance element at the ground connection point P3 and the ground connection point P4, respectively. The metal part 10 is connected to the GND 60 via With this configuration, even when at least one of the antenna 20 and the antenna 21 and the metal part 10 are connected at a high frequency, a high impedance is provided to the GND 60 at the position of the slit 30 connected at a high frequency. Can do.

  For example, as shown in FIG. 5A, the metal part 10 is connected to the GND 60 via the inductor 51 at the ground connection point P3 which is a position of a length L from the end of the metal part 10 on the slit 30 side. The metal part 10 is connected to the GND 60 via the inductor 51 at the ground connection point P4 that is a position of a length L from the end on the slit 32 side. With this configuration, the electrical length in the length L from the end on the slit 30 side of the metal part 10 and the electrical length in the length L from the end on the slit 32 side of the metal part 10 can be changed.

  As described above, in the wireless device 1b according to the present modification, the metal part 10 is connected to the GND 60 via the inductor 51 at the ground connection point P3 and the ground connection point P4. Therefore, regardless of the length of the metal part 10, even if at least one of the antenna 20 and the antenna 21 and the metal part 10 are connected at a high frequency, the antenna characteristics of the antenna 20 and the antenna 21 are affected. Can be suppressed.

[Modification 4]
Modification 4 will be described with reference to FIG. FIG. 5B is a schematic diagram illustrating a configuration of Modification 4 of the wireless device 1b according to the third embodiment.

  For example, when the metal part 10 is short and cannot be connected to the GND at the position of the electrical length of 1/8 of the wavelength of the communication frequency of the antenna 20 and the antenna 21 from the ends of the slit 30 and the slit 32 of the metal part 10, respectively. The communication frequency of 21 is increased. Here, since the communication frequency and the wavelength are inversely proportional (λ = c / f where f is the communication frequency, λ is the wavelength, and c is the propagation speed), the communication frequency of the antenna 21 is increased when the communication frequency of the antenna 21 is increased. The wavelength can be shortened.

  For example, if the length of the electrical length of ¼ of the wavelength of the communication frequency of the antenna 20 is L5, the length L5 from the end of the metal part 10 on the slit 30 side is shown in FIG. The metal part 10 is connected to the GND 60 at the position (ground connection point P5). Furthermore, if the length of the electrical length that is ¼ of the wavelength of the communication frequency of the antenna 21 is L6, as shown in FIG. 5B, the length L6 from the end of the metal portion 10 on the slit 32 side is shown. At the position (ground connection point P6), the metal part 10 is connected to the GND 60. Here, since the communication frequency of the antenna 21 is higher than the communication frequency of the antenna 20, the length L6 is shorter than the length L5.

  Thus, in the wireless device 1b according to this modification, the communication frequency of the antenna 21 is set higher than the communication frequency of the antenna 20. Thereby, the length L6 from the terminal by the side of the slit 32 of the metal part 10 can be shortened. Therefore, regardless of the length of the metal part 10, even if at least one of the antenna 20 and the antenna 21 and the metal part 10 are connected at a high frequency, the antenna characteristics of the antenna 20 and the antenna 21 are affected. Can be suppressed.

[Embodiment 4]
The following will describe another embodiment of the present invention with reference to FIG. FIG. 6 is a schematic diagram illustrating a configuration of a wireless device 1c according to the fourth embodiment of the present invention. In the present embodiment, in the wireless device 1c, the metal part 10 is divided by the slit 32 between the slit 30 and the ground connection point P.

  As shown in FIG. 1, the metal part 10 is connected to the GND 60 at a ground connection point P, which is a position having a length L that is ¼ of the wavelength of the communication frequency of the antenna 20 from the end on the slit 30 side. In this case, from the communication frequency of the antenna 20, unnecessary resonance occurs in the metal part 10. Therefore, the wireless device 1 shown in FIG. 1 has a slightly deteriorated free space characteristic as compared with the case where it is not connected to the GND 60 at the ground connection point P. Therefore, by adding the slit 34 between the slit 30 and the ground connection point P, the metal part 10 does not resonate at the communication frequency of the antenna 20, so that the free space characteristics can be prevented from deteriorating.

  Thus, in the wireless device 1c according to the present embodiment, the metal part 10 is divided between the slit 30 and the ground connection point P. Therefore, in the free space, the metal part 10 resonates at a length shorter than the length L of the electrical length that is ¼ of the wavelength of the communication frequency of the antenna 20, and thus does not affect the antenna characteristics of the antenna 20. Even when the slit 30 and the slit 34 are connected at high frequency, the end of the metal part 10 on the slit 30 side has a high impedance with respect to the GND 60 at the communication frequency of the antenna 20. Does not affect antenna characteristics. Even when only the slit 34 is connected at a high frequency, the metal part 12 is not connected to the GND 60, and thus does not affect the antenna characteristics of the antenna 20.

[Embodiment 5]
The following will describe another embodiment of the present invention with reference to FIG. FIG. 7A is a schematic diagram illustrating an example of the configuration of the antenna 20 according to the fifth embodiment of the present invention, and FIG. 7B illustrates another example of the configuration of the antenna 20 according to the fifth embodiment of the present invention. It is a schematic diagram, (c) is a schematic diagram showing still another example of the configuration of the antenna 20 in Embodiment 5 of the present invention. The wireless device 1d according to the present embodiment includes an antenna 20 that includes a missing part that is partially missing.

  As described above, a structure generated by sandwiching the metal part 10 and the antenna 20 between two molded articles made of resin may be used as the casing of the wireless device 1d. In this case, there is a possibility that the two resin moldings may be separated because the metal part 10 and the antenna 20 exist between them.

  Therefore, for example, as shown in FIG. 7A, the antenna 20 having the rectangular missing part 70 is sandwiched between two molded products made of resin. And also in the missing part 70, two resin moldings are bonded together. With this configuration, it is possible to suppress separation of the two resin molded products.

  Note that the shape and number of missing portions are not limited to the missing portions 70 shown in FIG. For example, as shown in FIG. 7B, the antenna 20 may include a circular missing portion 71 and a circular missing portion 72. Other examples of the shape of the missing part may be an ellipse, a polygon, or the like, and any shape can be used. Further, the number of missing parts is preferably provided with a plurality of missing parts in order to improve the adhesion strength between the two molded products made of resin.

  Further, the position where the missing part is provided is not limited to (a) and (b) in FIG. For example, as shown in FIG. 7C, the antenna 20 has a rectangular missing portion 73 and a rectangular missing portion 74 as shown in FIG. Also good.

  In addition, the size of the missing part is preferably set so as not to affect the antenna characteristics of the antenna 20. For example, when the missing part 70 is rectangular as shown in FIG. 7A, the influence on the antenna characteristics is obtained by setting the communication frequency of the antenna 20 to 1/8 wavelength × 1/8 wavelength or less. Can be suitably suppressed.

  As described above, in the radio device 1d according to the present embodiment, the antenna 20 has a missing part that is partially missing, and the area of the missing part is 1/8 of the wavelength of the communication frequency of the antenna 20. The area is less than or equal to the square of. Therefore, in the case where the antenna 20 is sandwiched between two resin moldings, the two resin moldings can be peeled off because the two resin moldings can be bonded even at the missing portion. Can be suppressed.

  In the present specification, at the position of the length L where the electrical length is (2n−1) λ / 8 to (2n + 1) λ / 8 (n is an odd natural number) from the end of the metal part 10 on the slit 30 side. However, the present invention is not limited as long as the terminal on the slit 30 side has a high impedance with respect to the GND 60 at the communication frequency of the antenna 20.

  For example, the metal part 10 is connected to the GND 60 via a resistor having a large resistance value, and the metal part 10 is set to have a high impedance with respect to the GND 60, so that the metal part 10 is connected to the GND 60 regardless of the position where it is connected. The terminal may be configured to have a high impedance with respect to the GND 60 at the communication frequency of the antenna 20.

  Alternatively, the metal part 10 and the GND 60 may not be connected, so that the end of the metal part 10 on the slit 30 side has a high impedance with respect to the GND 60 at the communication frequency of the antenna 20.

  Furthermore, when the metal part 10 is a metal having a resistance component, the end on the slit 30 side is connected to the GND 60 at the communication frequency of the antenna 20 by connecting to the GND 60 at a position having a length different from the length L. It may be configured to have a high impedance.

[Summary]
The wireless devices (1 to 1c) according to the first aspect of the present invention include a metal part (10) and a first antenna (antenna 20) that are separated by a first gap (slit 30) on the outer periphery. The metal part has a high impedance with respect to the ground at the communication frequency of the first antenna at the end of the metal part on the first gap side.

  According to the above configuration, the end of the metal part on the first gap side of the metal part has high impedance with respect to the ground at the communication frequency of the first antenna. Therefore, even if the metal part and the first antenna are connected at a high frequency, the end of the metal part on the first gap side of the first antenna is almost invisible to the ground. The influence on the antenna characteristics can be suppressed.

  In the wireless device according to aspect 2 of the present invention, in the aspect 1, the metal part is configured such that the end of the metal part on the first gap side is higher than the ground at the communication frequency of the first antenna. It may be connected to the ground at a connection position (ground connection point P) that provides impedance.

  According to said structure, the terminal by the side of the 1st clearance gap of a metal part can be made high impedance suitably.

  In the wireless device according to aspect 3 of the present invention, in the above aspect 2, when the wavelength of the communication frequency of the first antenna is λ, the terminal on the first gap side of the metal part from the connection position with the ground The electrical length up to (2n−1) λ / 8 to (2n + 1) λ / 8 (n is an odd natural number) may be used.

  According to said structure, a metal part is a position whose electrical length to the terminal by the side of the 1st clearance gap is the length of (2n-1) (lambda) / 8- (2n + 1) (lambda) / 8 (n is an odd natural number). In FIG. For this reason, the end of the metal part on the first gap side can be suitably made high impedance, and thus the influence on the antenna characteristics of the first antenna can be suppressed.

  The wireless device according to aspect 4 of the present invention may further include a reactance element (inductor 51) in the aspect 2 or 3, and the metal part may be connected to the ground via the reactance element.

  According to the above configuration, even if the metal part cannot be connected to the ground at a desired position, the position connected to the ground from the first gap side of the metal part by connecting to the ground via the reactance element. The electrical length of the metal part up to can be changed. Therefore, regardless of the length of the metal part, even when the metal part and the first antenna are connected in high frequency, the influence on the antenna characteristics of the first antenna can be suppressed.

  The wireless device according to aspect 5 of the present invention is the wireless device according to any one of the aspects 2 to 4, wherein the first antenna performs wireless communication at a plurality of communication frequencies different from each other, and the metal part includes the metal part described above. The terminal on the first gap side may be connected to the ground at a connection position where the impedance is high with respect to the ground at each of the plurality of different communication frequencies.

  According to the above configuration, even when the first antenna performs wireless communication at a plurality of communication frequencies, the metal portion is the first of the metal portion with respect to the ground at each of the plurality of communication frequencies. Since the end on the gap side has a high impedance, the influence on the antenna characteristics of the first antenna can be suppressed.

  The wireless device according to Aspect 6 of the present invention is the second gap (slit 32) on the outer periphery according to any one of Aspects 2 to 5, wherein the second gap is different from the first gap. A second antenna (antenna 21) that is separated from the metal part by the metal part, wherein the metal part further has an end on the second gap side of the metal part at a communication frequency of the second antenna. Further, it may be connected to the ground at a connection position where the impedance is high with respect to the ground.

  According to the above configuration, in the configuration in which the wireless device includes the first antenna and the second antenna, even when the metal portion and the first antenna are connected at a high frequency, the first gap of the metal portion The terminal on the side has a high impedance with respect to the ground at the communication frequency of the first antenna, and the influence on the antenna characteristics of the first antenna can be suppressed. Furthermore, even when the metal part and the second antenna are connected at a high frequency, the end on the second gap side of the metal part has a high impedance with respect to the ground at the communication frequency of the second antenna. The influence on the antenna characteristics of the second antenna can be suppressed.

  In the radio device according to aspect 7 of the present invention, in any one of the above aspects 2 to 6, the metal part is connected to the ground in the first gap and the metal part (ground connection part P). It may be divided between and.

  If the metal part is not divided between the first gap side and the position connected to the ground, the metal part will cause unnecessary resonance from the communication frequency of the first antenna. However, according to the above configuration, the metal portion does not resonate at the communication frequency of the first antenna. Therefore, the wireless device can improve the free space characteristics as compared with the case where the wireless device is not divided between the first gap and the position connected to the ground in the metal portion.

  In the wireless device according to aspect 8 of the present invention, in any of the above aspects 1 to 7, the metal part may be disposed along the outer periphery.

  According to said structure, since a metal part is arrange | positioned along outer periphery, the structure which uses a metal part as a housing | casing of a radio | wireless machine, or the structure which uses a metal part as at least one part of the housing | casing of a radio | wireless machine is realizable. .

  In the wireless device according to aspect 9 of the present invention, in any one of aspects 1 to 8, the first antenna may be disposed along the outer periphery.

  According to said structure, since a 1st antenna is arrange | positioned along outer periphery, the structure which uses a 1st antenna as a housing | casing of a radio | wireless machine, or a 1st antenna is at least one part of the housing | casing of a radio | wireless machine The configuration can be realized.

  In the radio device according to aspect 10 of the present invention, in any one of the above aspects 1 to 9, the first antenna has a missing part (70, 71, 72, 73, 74) in which a part is missing. The area of the missing portion may be an area that is less than or equal to 1/8 of the wavelength of the communication frequency of the first antenna.

  According to the above configuration, when the first antenna is sandwiched between two resin moldings, the two resin moldings can be bonded even at the missing portion, so two resin moldings are possible. It can suppress that an object peels.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be widely used for a wireless device including a metal part and an antenna arranged on the outer periphery via a gap.

1, 1a, 1b, 1c, 1d Radio 10, 11, 12 Metal part 20 Antenna (first antenna)
21 Antenna (second antenna)
30 slit (first gap)
31, 33 slit 32 slit (second gap)
34 Slit (third gap)
40, 41 Feed point 50 Inductor 51 Inductor (inductance element)
52, 53 Filter 60 GND (Ground)
L, L1, L2, L3, L4, L5, L6 Length P, P1, P2, P3, P4, P5, P6 Ground connection point 70, 71, 72, 73, 74 Missing part

Claims (10)

In the radio,
A metal portion and a first antenna that are separated by a first gap on the outer periphery that is a surrounding area along the outside of the wireless device ;
The metal part is a wireless device in which the first gap side end of the metal part has a high impedance with respect to the ground at the communication frequency of the first antenna.   The metal part is connected to the ground at a connection position where the end of the first gap side of the metal part has a high impedance with respect to the ground at the communication frequency of the first antenna. The wireless device according to claim 1, wherein:   When the wavelength of the communication frequency of the first antenna is λ, the electrical length from the connection position to the ground to the end of the metal part on the first gap side is (2n−1) λ / 8 to ( 3. The radio according to claim 2, wherein 2n + 1) λ / 8 (n is an odd natural number). Further comprising a reactance element;
The radio device according to claim 2 or 3, wherein the metal part is connected to the ground via the reactance element. The first antenna performs wireless communication at a plurality of different communication frequencies,
The metal part is connected to the ground at a connection position where the end of the metal part on the first gap side has a high impedance to the ground at each of the plurality of different communication frequencies. The wireless device according to any one of claims 2 to 4, wherein: A second gap on the outer periphery, further comprising a second antenna separated from the metal part by a second gap different from the first gap;
The metal part is further connected to the ground at a connection position where the end of the metal part on the second gap side has a high impedance with respect to the ground at the communication frequency of the second antenna. The wireless device according to any one of claims 2 to 5, wherein:   The said metal part is divided | segmented between said 1st clearance gap and the connection position connected to the said ground in the said metal part, The any one of Claims 2-6 characterized by the above-mentioned. Radio.   The wireless device according to claim 1, wherein the metal part is disposed along the outer periphery.   The wireless device according to claim 1, wherein the first antenna is arranged along the outer periphery. The first antenna has a missing part that is partially missing,
10. The wireless device according to claim 1, wherein an area of the missing portion is an area equal to or less than 1/8 of a wavelength of a communication frequency of the first antenna. 11.

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