Antenna device and communication device

Abstract

This antenna device is provided with: a power feeding antenna element; and a casing including a non-power feeding antenna element which extends in such a way as to be electrically coupled to the power feeding antenna element, and which has a resonant frequency different from that of the power feeding antenna element.

Description

[Technical field]

[0001] The present disclosure relates to an antenna device and a communication device. [Background technology]

[0002] For example, Patent Document 1 discloses a method of giving the housing the same resonant frequency as the feeding antenna element in order to reduce the effect of the housing on the radiation characteristics of the feeding antenna element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 125556 Summary of the Invention [Problem to be solved by the invention]

[0004] It is possible to use the resonant frequency of the housing to achieve multi-band operation, but Patent Document 1 does not consider this point at all.

[0005] One aspect of the present disclosure provides an antenna device and a communication device capable of achieving multi-band operation. [Means for solving the problem]

[0006] An antenna device according to one aspect of the present disclosure includes a powered antenna element, and a housing including a parasitic antenna element extending so as to be electrically coupled to the powered antenna element and having a resonant frequency different from that of the powered antenna element.

[0007] A communication device according to one aspect of the present disclosure comprises a powered antenna element and a housing including a parasitic antenna element extending so as to be electrically coupled to the powered antenna element and having a resonant frequency different from that of the powered antenna element, and communicates using the powered antenna element. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating an example of a schematic configuration of an antenna device according to an embodiment. [Diagram 2] FIG. 4 is a diagram illustrating an example of a schematic configuration of a connection portion. [Diagram 3] FIG. 13 is a diagram illustrating an example of a plurality of resonant frequencies. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following embodiments, the same elements are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0010] The present disclosure will be described in the following order. 1. Embodiment 2. Effects

[0011] 1. Embodiment Fig. 1 is a diagram showing an example of a schematic configuration of an antenna device according to an embodiment. Fig. 1 is also a diagram showing a schematic configuration of a part of a communication device in which the antenna device is incorporated. An example of the communication device is a mobile communication device such as a smartphone. The communication device performs communication using an antenna device 100, more specifically, a power supply antenna element 3 described later, etc.

[0012] The antenna device 100 includes a substrate 1, a housing 2, a fed antenna element 3, a parasitic antenna element 4, and an additional parasitic antenna element 5. As described below, the parasitic antenna element 4 is included in the housing 2. For ease of explanation, an XYZ coordinate system is illustrated. The X-axis and Y-axis directions correspond to the surface direction of the substrate 1. The Z-axis direction corresponds to the thickness direction of the substrate 1.

[0013] The substrate 1 has a ground (hereinafter referred to as "ground GND") having a reference potential. In addition to the elements shown in the figure, various other elements are provided on the substrate 1. Examples of the other elements include a circuit for generating a transmission signal for the power supply antenna element 3, a circuit for processing a received signal, etc.

[0014] The housing 2 houses the substrate 1, the fed antenna element 3, and the additional parasitic antenna element 5. Other elements (not shown, for example, a battery for a communication device) may also be housed in the housing 2. The housing 2 includes a housing 21 and a housing 22. The housings 21 and 22 form a frame (frame portion) that surrounds the substrate 1, the fed antenna element 3, and the additional parasitic antenna element 5 in the XY plane.

[0015] Housing 21 constitutes the upper portion of the frame (the portion on the positive side of the Y axis). Housing 21 constitutes the upper side and both corner portions of the frame. Housing 22 constitutes at least a part of the portion below housing 21 (the portion on the negative side of the Y axis).

[0016] The housing 21 and the housing 22 are conductive. An example of the material is metal. The housing 21 and the housing 22 are separated from each other by the housing 2. In this example, a gap is provided between the housing 21 and the housing 22. The gap may be filled with an insulator such as resin. The upper end portion of the housing 22 (the portion facing the housing 21) may be connected to the ground GND.

[0017] The housing 21 also has a certain degree of length in the Z-axis direction so as to have an inner surface facing the power supply antenna element 3 and the like.

[0018] The power-feeding antenna element 3 has a resonant frequency. The resonant frequency of the power-feeding antenna element 3 is a frequency within the operating frequency band of the antenna device 100. An example of the operating frequency band is the communication frequency band of the communication device. Examples of the communication frequency band include a band of 700 MHz to 960 MHz, a band of 1400 MHz to 1510 MHz, a band of 1710 MHz to 2200 MHz, a band of 2300 MHz to 2700 MHz, a band of 3400 MHz to 3600 MHz, a band of 3600 MHz to 4100 MHz, and a band of 4500 MHz to 4600 MHz.

[0019] Examples of the feeding antenna element 3 include an LDS (Laser Direct Structuring) antenna and a metal pattern formed on the substrate 1. In this example, the feeding antenna element 3 is provided near the left corner (X-axis negative direction side) of the housing 22. However, the position of the feeding antenna element 3 is not limited to the example shown in FIG.

[0020] The illustrated feeding antenna element 3 includes a base 31, an extension 32, an extension 33, and an extension 34. The base 31 extends from one end having a feeding point 3a in an upper left direction (a direction between the negative direction of the X-axis and the positive direction of the Y-axis) toward a corner of the housing 22. However, the shape of the feeding antenna element 3 is not limited to the example shown in Fig. 1. In addition to the approximate T-shape shown in Fig. 1, the feeding antenna element 3 may have various shapes such as an L-shape.

[0021] The extension portion 32 extends from both ends of the base portion 31. The extension portion 33 is connected to one end of the extension portion 32 and extends in a direction different from the extending direction of the extension portion 32. The extension portion 34 is connected to the other end of the extension portion 32 and extends in a direction different from the extending direction of the extension portion 32. The extension portions 32, 33, and 34 generally extend along the corner portions of the housing 21. In this example, the extension portion 32 extends so as to face the corner of the housing 21. The extension portion 33 extends downward (Y-axis negative direction) along the left side portion of the housing 21 (portion on the X-axis negative direction side). The extension portion 34 extends rightward (X-axis positive direction) along the upper side portion of the housing 21. At least a part of the extension portion 32, the extension portion 33, and the extension portion 34 may be smoothly curved, for example, along a corner of the housing 21.

[0022] The extension parts 32, 33, and 34 each have a certain degree of length in the Z-axis direction so as to have a surface facing the inner side surface of the housing 21. Specifically, the extension part 32 has a surface facing the inner side surface of a corner portion of the housing 21. The extension part 33 has a surface (a surface extending in the YZ plane) facing the inner side surface of the left side portion of the housing 21. The extension part 34 has a surface (a surface extending in the XZ plane) facing the inner side surface of the upper side portion of the housing 21.

[0023] The fed antenna element 3 has a resonant frequency according to the electrical length of the fed antenna element 3. The electrical length of the fed antenna element 3 is mainly determined by the extensions 32, 33, and 34. The resonant frequency of the fed antenna element 3 is a frequency at which the electrical length from the feeding point F to the tip of the extension 33 or the tip of the extension 34 is λ / 4 (λ is the wavelength).

[0024] The parasitic antenna element 4 is included in the housing 2 (is a part of the housing 2). In this example, the parasitic antenna element 4 is the housing 21. The parasitic antenna element 4 extends so as to be electrically coupled to the fed antenna element 3 in the operating frequency band of the antenna device 100. The electrical coupling between the fed antenna element 3 and the parasitic antenna element 4 includes capacitive coupling.

[0025] The parasitic antenna element 4 has a resonant frequency according to the electrical length of each portion (first portion 41 and second portion 42 described below) of the parasitic antenna element 4. The resonant frequency of the parasitic antenna element 4, like the resonant frequency of the powered antenna element 3, is a frequency within the operating frequency band of the antenna device 100. The resonant frequency of the parasitic antenna element 4 is different from the resonant frequency of the powered antenna element 3. The resonant frequency of the parasitic antenna element 4 may be a frequency included in a band different from the band including the resonant frequency of the powered antenna element 3. The parasitic antenna element 4 may have multiple resonant frequencies each included in a different band.

[0026] The resonant frequency of the parasitic antenna element 4 may be lower than the resonant frequency of the powered antenna element 3. If the resonant frequency of the parasitic antenna element 4 is lower than the resonant frequency of the powered antenna element 3, the powered antenna element 3 becomes smaller relative to the parasitic antenna element 4, and can be structurally contained within the parasitic antenna element 4, which contributes to miniaturization. In addition, the powered antenna element 3 can be coupled to the parasitic antenna element 4 as a transmission path without interfering with radiation from the powered antenna element 3 alone.

[0027] The parasitic antenna element 4 includes a first portion 41 and a second portion 42. In this example, the first portion 41 is the portion on the left side (negative direction of the X-axis), and the second portion 42 is the portion on the right side (positive direction of the X-axis). The length of the first portion 41 (boundary with the second portion 42) is determined by the position of a contact point 4b, which will be described later. The first portion 41 is the left portion including the contact point 4b, and the second portion 42 is the portion on the right side of the contact point 4b.

[0028] The first portion 41 corresponds to a left corner portion of the housing 21. The first portion 41 extends along the extension direction of the feeding antenna element 3 so as to generate capacitive coupling with the feeding antenna element 3 (constituting a transmission line). Since the housing 21 faces the extending portion 32, the extending portion 33, and the extending portion 34 of the feeding antenna element 3 at the corner portion, capacitive coupling is generated between the first portion 41 and the feeding antenna element 3.

[0029] The length of the first portion 41 may be longer than the length of the fed antenna element 3. This can improve the electrical coupling between the first portion 41 of the parasitic antenna element 4 and the fed antenna element 3. Specifically, by making the resonant frequency of the parasitic antenna element 4 lower than the resonant frequency of the fed antenna element 3, it is possible to couple the fed antenna element 3 to the parasitic antenna element 4 as a transmission path without interfering with radiation from the fed antenna element 3 alone.

[0030] The second portion 42 extends adjacent to the first portion 41. The second portion 42 is electrically coupled to the feeding antenna element 3 via the first portion 41.

[0031] The parasitic antenna element 4 has a contact 4a, a contact 4b and a contact 4c which can be connected to the ground GND.

[0032] Contact 4a and contact 4b are provided on the first portion 41. Contact 4a is provided on one end portion of the first portion 41 (the end portion opposite the second portion 42). Contact 4b is provided on the other end portion of the first portion 41 (the end portion on the second portion 42 side). In other words, contact 4b determines the position of the other end portion of the first portion 41 in the parasitic antenna element 4 (the boundary between the first portion 41 and the second portion 42).

[0033] The contact point 4c is provided on the second portion 42. The contact point 4c is provided on the other end portion of the second portion 42 (the end portion opposite the first portion 41). One end portion of the second portion 42 (the end portion on the first portion 41 side) is connected to the other end portion of the first portion 41.

[0034] The antenna device 100 also includes connection parts that enable connection of the contacts 4a, 4b, and 4c to the ground GND. This ensures the ground for the parasitic antenna element 4, allowing the parasitic antenna element 4 to have a resonant frequency. The connection parts will be described with reference to FIG. 2.

[0035] 2 is a diagram showing an example of a schematic configuration of the connection parts, in which three connection parts 6a, 6b, and 6c are shown.

[0036] The connection portion 6a is a first connection portion provided between the contact 4a and the ground GND. The connection portion 6a includes a contact portion 61a and a connection circuit 62a.

[0037] The contact portion 61a brings the contact 4a into contact with the substrate 1. The configuration of the contact portion 61a is not particularly limited, but may be, for example, a contact terminal such as a contact spring, a conductive screw, or the like.

[0038] The connection circuit 62a is connected between the contact portion 61a and the ground GND. The connection circuit 62a defines the connection state between the contact portion 61a and the ground GND, i.e., the connection state between the contact 4a of the parasitic antenna element 4 and the ground GND. By defining various connection states, the parasitic antenna element 4 can have more resonant frequencies.

[0039] Examples of the connection state are a state in which the contact 4a is connected to the ground GND (short state) and a state in which the contact 4a is not connected to the ground GND (e.g., open state). The connection circuit 62a may define the connection state for each frequency band. For example, the connection circuit 62a sets the contact 4a in a short state in a specific frequency band and sets the contact 4a in an open state in other frequency bands. Such a connection circuit 62a includes, for example, a filter. An example of a filter is a bandpass filter that passes signals in a specific frequency band. As a filter, a filter circuit including coils and / or capacitors arranged in series and / or parallel may be used.

[0040] Another example of the connection state is the impedance and phase from the contact 4a to the ground GND. The impedance and phase adjust the electrical length of the first portion 41 of the parasitic antenna element 4, and therefore the resonant frequency of the first portion 41. The connection circuit 62a may define the connection state according to the frequency band used. For example, the connection circuit 62a adjusts the impedance and phase from the contact 4a to the ground GND so that the resonant frequency of the first portion 41 of the parasitic antenna element 4 is included in the frequency band used. Such a connection circuit 62a is configured to include an active element. An example of the active element is a switch such as an SP4T. The switch is provided to provide multiple paths between the contact 4a and the ground GND. Circuit elements and the like may be provided on several paths so that each path has a different impedance and phase. The switch switches the impedance and phase from the contact 4a to the ground GND. The antenna device 100 may also include a control unit and the like required for switch control.

[0041] The connection circuit 62a may have a configuration that combines both the filter and switch configurations described above.

[0042] The connection portion 6b is a second connection portion provided between the contact 4b and the ground GND. The connection portion 6b includes a contact portion 61b and a connection circuit 62b. The contact portion 61b brings the contact 4b into contact with the substrate 1. The connection circuit 62b defines the connection state between the contact portion 61b and the ground GND, i.e., the connection state between the contact 4b of the parasitic antenna element 4 and the ground GND. The details are the same as those of the contact portion 61a and the connection circuit 62a described above, and therefore will not be described repeatedly. The specific frequency band (e.g., the pass band of a filter) in which the connection circuit 62b shorts the connection state may be a frequency band different from the specific frequency band in the connection circuit 62a described above.

[0043] The connection portion 6c is a third connection portion provided between the contact 4c and the ground GND. The connection portion 6c includes a contact portion 61c and a connection circuit 62c. The contact portion 61c brings the contact 4c into contact with the substrate 1. The connection circuit 62c defines the connection state between the contact portion 61c and the ground GND, i.e., the connection state between the contact 4c of the parasitic antenna element 4 and the ground GND. The details are the same as those of the contact portion 61a and the connection circuit 62a described above, and therefore will not be described repeatedly. The specific frequency band in which the connection circuit 62c shorts the connection state may be a frequency band different from the specific frequency band in the connection circuit 62a described above and the specific frequency band in the connection circuit 62b.

[0044] Returning to FIG. 1, the additional parasitic antenna element 5 will be described. The additional parasitic antenna element 5 is a parasitic antenna element separate from the parasitic antenna element 4, and is provided on the substrate 1 in this example. One end of the additional parasitic antenna element 5 (the end closer to the fed antenna element 3 in this example) is connected to the ground GND. The additional parasitic antenna element 5 is electrically coupled to the fed antenna element 3 via the substrate 1. Examples of the additional parasitic antenna element 5 include an LDS antenna, a metal pattern formed on the substrate 1, and the like. The metal pattern is provided in a portion of the substrate 1 where there is no ground GND pattern. The LDS antenna may be provided in a portion of the substrate 1 where there is a ground GND pattern, or may be provided in a portion of the substrate 1 where there is no ground GND pattern.

[0045] The additional parasitic antenna element 5 has a resonant frequency different from the resonant frequency of the powered antenna element 3 and the parasitic antenna element 4. The resonant frequency of the additional parasitic antenna element 5, like the resonant frequencies of the powered antenna element 3 and the parasitic antenna element 4, is a frequency within the operating frequency band of the antenna device 100. The resonant frequency of the additional parasitic antenna element 5 may be a frequency included in a band different from the band including the resonant frequency of the powered antenna element 3 and the band including the resonant frequency of the parasitic antenna element 4. The resonant frequency of the additional parasitic antenna element 5 may be lower than the resonant frequency of the powered antenna element 3.

[0046] A plurality of resonant modes can coexist in the antenna device 100 having the above-described configuration. Some examples of the resonant modes will be described with reference to FIG.

[0047] 3 is a diagram showing examples of a plurality of resonance modes, in which six resonance modes M1 to M6 are illustrated.

[0048] Resonant mode M1 is a mode in which resonance occurs at a frequency (first resonant frequency) where the electrical length of the entire parasitic antenna element 4 is λ / 2. An example of the first resonant frequency is a frequency in the 700 MHz band. At the first resonant frequency, contact 4a is in a shorted state. Contact 4b is in an open state. Contact 4c is in a shorted state.

[0049] The resonant mode M2 ​​is a mode that resonates at a frequency (second resonant frequency) where the electrical length of the first portion 41 of the parasitic antenna element 4 is λ / 2. An example of the resonant frequency is a frequency in the 1800 MHz band. At the second resonant frequency, the contact 4a is in a short state. The contact 4b is in a short state. The contact 4c is in an arbitrary state. In order to avoid unexpected and unnecessary resonance, the short state may be adopted as the arbitrary state.

[0050] The resonant mode M3 is a mode in which the antenna resonates at a frequency (third resonant frequency) where the electrical length of the first portion 41 of the parasitic antenna element 4 is λ / 4. An example of the third resonant frequency is a frequency in the 900 MHz band. At the third resonant frequency, the contact 4a is in an open state, the contact 4b is in a short state, and the contact 4c is in an arbitrary state.

[0051] The resonant mode M4 is a mode that resonates at a frequency (fourth resonant frequency) where the electrical length of the second portion 42 of the parasitic antenna element 4 is λ / 2. An example of the fourth resonant frequency is a frequency in the 1500 MHz band. At the fourth resonant frequency, the contact 4a is in an arbitrary state. The contact 4b is in a shorted state. The contact 4c is in a shorted state.

[0052] The resonant mode M5 is a mode in which the power supply antenna element 3 resonates at a frequency (fifth resonant frequency) where the electrical length of the power supply antenna element 3 is λ / 4. An example of the fifth resonant frequency is a frequency in the 3500 MHz band. At the fifth resonant frequency, the contact 4a is in a shorted state. The contact 4b is in a shorted state. The contact 4c is in an arbitrary state.

[0053] The resonant mode M6 is a mode in which the additional parasitic antenna element 5 resonates at a frequency (sixth resonant frequency) at which the electrical length of the additional parasitic antenna element 5 is λ / 4. An example of the sixth resonant frequency is a frequency in the 2500 MHz band. At the sixth resonant frequency, the contact 4a is in an arbitrary state. The contact 4b is in an arbitrary state. The contact 4c is in an arbitrary state.

[0054] As described above, the connection circuits 62a, 62b, and 62c define the connection state for each frequency band. In the example shown in FIG. 3, the connection circuit 62a shorts the contact 4a in the 700 MHz band, the 1800 MHz band, and the 3500 MHz band, and opens the contact 4a in the 900 MHz band. The connection circuit 62b shorts the contact 4b in the 1800 MHz band, the 900 MHz band, the 1500 MHz band, and the 3500 MHz band, and opens the contact 4b in the 700 MHz band. The connection circuit 62c shorts the contact 4c in the 700 MHz band and the 1500 MHz band. When the connection circuits 62a, etc. adjust the impedance or phase between the contact 4a, etc. and the ground GND, the first to fourth resonant frequencies can also be adjusted, for example.

[0055] For example, the above-mentioned multiple resonant modes can provide multiband operation for the antenna device 100. Furthermore, by using the housing 2 including the parasitic antenna element 4, the antenna device 100 can be made smaller than when the parasitic antenna element 4 is provided separately from the housing 2.

[0056] Although the embodiments of the present disclosure have been described above, the technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present disclosure. Some examples will be described.

[0057] Some of the connecting parts may not have a connecting circuit. For example, the connecting part 6c may not have the connecting circuit 62c and the contact part 61c may be directly connected to the ground GND. Even in this case, the connection state of the contact 4c for each frequency band described above with reference to FIG. 3 may be specified.

[0058] The number and positions of contacts provided on the parasitic antenna element 4 are not limited to the contacts 4a, 4b, and 4c. Any number of contacts may be provided at any positions.

[0059] A number of additional parasitic antenna elements 5 may be provided.

[0060] The frequency band including the resonant frequency is not limited to the specific frequency bands described above with numerical values.

[0061] The antenna device 100 may be incorporated into various devices such as a radar device and the like in addition to a communication device.

[0062] 2.Effects The above-described antenna device 100 is specified, for example, as follows: As described with reference to Fig. 1 and Fig. 3 etc., the antenna device 100 includes a housing 2 including a powered antenna element 3 and a parasitic antenna element 4 that extends so as to be electrically coupled to the powered antenna element 3 and has a resonant frequency different from that of the powered antenna element 3.

[0063] According to the above antenna device 100, it is possible to achieve multi-band operation by coexisting the resonant frequency of the powered antenna element 3 and the resonant frequency of the parasitic antenna element 4 included in the housing 2. In addition, it is possible to make the antenna device 100 smaller than when a parasitic antenna element is provided separately from the housing 2.

[0064] 2 and the like, the antenna device 100 may include the connection parts 6a, 6b, and 6c provided between the parasitic antenna element 4 and the ground GND. This ensures the ground for the parasitic antenna element 4, and allows the parasitic antenna element 4 to have a resonant frequency corresponding to the ground.

[0065] 2 and 3, the connection portion 6a, the connection portion 6b, and the connection portion 6c may include a connection circuit 62a, a connection circuit 62b, and a connection circuit 62c that define the connection state between the parasitic antenna element 4 and the ground GND. The connection circuit 62a, the connection circuit 62b, and the connection circuit 62c may include a filter that defines the connection state for each frequency band, or may include a switch that defines the connection state according to the frequency band used. This allows the parasitic antenna element 4 to have more resonant frequencies.

[0066] 1 and the like, the feeding antenna element 3 may have a base 31 having a feeding point 3a and extensions 32 extending to both sides from the ends of the base 31. For example, an antenna having such a T-shape can be used as the feeding antenna element 3.

[0067] 1 and the like, the parasitic antenna element 4 may include a first portion 41 extending along the extension direction of the powered antenna element 3 so as to generate capacitive coupling between the parasitic antenna element 4 and the powered antenna element 3, and a second portion 42 extending in contact with the first portion 41. For example, in this manner, the parasitic antenna element 4 can be electrically coupled to the powered antenna element 3.

[0068] 1 and the like, the length of the first portion 41 of the parasitic antenna element 4 may be longer than the length of the powered antenna element 3. This can improve the electrical coupling between the first portion 41 of the parasitic antenna element 4 and the powered antenna element 3.

[0069] As described with reference to FIG. 1 and FIG. 2, the connection portion 6a may be a first connection portion provided between one end portion (where the contact 4a is provided) of the first portion 41 of the parasitic antenna element 4 and the ground GND. The connection portion 6b may be a second connection portion provided between the other end portion (where the contact 4b is provided) of the first portion 41 of the parasitic antenna element 4 and the ground GND. The connection portion 6c may be a third connection portion provided between the end portion (where the contact 4b is provided) of the second portion 42 of the parasitic antenna element 4 opposite to the first portion 41 and the ground GND. For example, by providing such a plurality of connection portions 6a, 6b, and 6c, the parasitic antenna element 4 can have many resonant frequencies.

[0070] The parasitic antenna element 4 may have a resonant frequency lower than the resonant frequency of the powered antenna element 3. This allows, for example, the powered antenna element 3 to be coupled to the parasitic antenna element 4 as a transmission path without interfering with radiation from the powered antenna element 3 alone.

[0071] As described with reference to Figures 1 and 3, the antenna device 100 may include an additional parasitic antenna element 5 that is electrically coupled to the fed antenna element 3 and has a resonant frequency different from the resonant frequency of the parasitic antenna element 4 and the resonant frequency of the additional parasitic antenna element 5. The additional parasitic antenna element 5 may be electrically coupled to the fed antenna element 3 via the substrate 1. The additional parasitic antenna element 5 may have a resonant frequency lower than the resonant frequency of the fed antenna element 3. By including such an additional parasitic antenna element 5, the number of coexisting resonant frequencies can be increased to achieve further multi-band support.

[0072] A communication device that performs communication using the antenna device 100 is also one aspect of the present disclosure. That is, the communication device includes a powered antenna element 3 and a housing 2 that includes a parasitic antenna element 4 that extends so as to be electrically coupled to the powered antenna element 3 and has a resonant frequency different from that of the powered antenna element 3, and performs communication using the powered antenna element 3. In such a communication device, it is possible to achieve multi-band operation and to reduce the size of the device.

[0073] The effects described in this disclosure are merely examples and are not limited to the disclosed contents. Other effects may be obtained. The parasitic antenna element 4 may be fed. For example, the parasitic antenna element 4 (second antenna element) may be fed together with or instead of the feeding of the feeding antenna element 3 (first antenna element). Even in this case, it is possible to achieve multi-band operation and to miniaturize the device.

[0074] The present technology can also be configured as follows. (1) A feeding antenna element; a housing including a parasitic antenna element extending so as to be electrically coupled to the powered antenna element and having a resonant frequency different from that of the powered antenna element; Equipped with Antenna device. (2) A connection portion is provided between the parasitic antenna element and a ground. An antenna device as described in (1). (3) The connection unit includes a connection circuit that defines a connection state between the parasitic antenna element and ground. An antenna device as described in (2). (4) the connection circuit includes a filter that defines the connection state for each frequency band; An antenna device as described in (3). (5) the connection circuit includes a switch that determines the connection state according to a frequency band used; An antenna device as described in (3) or (4). (6) The feeding antenna element is A base having a power supply point; An extension portion extending from an end of the base portion on both sides; having An antenna device according to any one of (1) to (5). (7) The parasitic antenna element is a first portion extending along an extension direction of the feeding antenna element so as to generate capacitive coupling between the feeding antenna element and the first portion; a second portion extending adjacent to the first portion; Including, An antenna device according to any one of (1) to (6). (8) The length of the first portion of the parasitic antenna element is longer than the length of the powered antenna element. The antenna device according to (7). (9) a plurality of connection parts provided between the parasitic antenna element and a ground; The plurality of connection portions include a first connection portion provided between one end of the first portion of the parasitic antenna element and a ground; a second connection portion provided between the other end of the first portion of the parasitic antenna element and a ground; Including, An antenna device as described in (7) or (8). (10) The plurality of connection portions include a third connection portion provided between a tip end of the second portion of the parasitic antenna element opposite to the first portion and ground. The antenna device according to (9). (11) The parasitic antenna element has a resonant frequency lower than a resonant frequency of the powered antenna element. An antenna device according to any one of (1) to (10). (12) an additional parasitic antenna element electrically coupled to the powered antenna element and having a resonant frequency different from the resonant frequency of the powered antenna element and the resonant frequency of the parasitic antenna element; An antenna device according to any one of (1) to (11). (13) the additional parasitic antenna element is electrically coupled to the powered antenna element via a substrate; The antenna device according to (12). (14) The additional parasitic antenna element has a resonant frequency lower than a resonant frequency of the powered antenna element. An antenna device as described in (12) or (13). (15) A feeding antenna element; a housing including a parasitic antenna element extending so as to be electrically coupled to the powered antenna element and having a resonant frequency different from that of the powered antenna element; Equipped with Communication is performed using the power supply antenna element. Communications equipment. [Explanation of symbols]

[0075] 1 Board 2. Chassis 21 Case 22 Case 3 Powered antenna element 31 Base 32 Extension 33 Extension part 34 Extension 4 Parasitic antenna elements 41 First Part 42 Second Part 4a Contact 4b Contact 4c Contact 5 Additional parasitic antenna elements 6a Connection 6b Connection 6c Connection 61a Contact part 61b Contact part 61c Contact part 62a Connection circuit 62b Connection circuit 62c Connection circuit 100 Antenna device (communication device)

Claims

1. A feeding antenna element; a housing including a parasitic antenna element extending so as to be electrically coupled to the powered antenna element and having a resonant frequency different from that of the powered antenna element; Equipped with The parasitic antenna element is a first portion extending along an extension direction of the feeding antenna element so as to generate capacitive coupling between the feeding antenna element and the first portion; a second portion extending adjacent to the first portion; Including, Antenna device.

2. A connection portion is provided between the parasitic antenna element and a ground.

2. The antenna device according to claim 1.

3. The connection unit includes a connection circuit that defines a connection state between the parasitic antenna element and ground.

3. The antenna device according to claim 2.

4. the connection circuit includes a filter that defines the connection state for each frequency band; 4. The antenna device according to claim 3.

5. the connection circuit includes a switch that determines the connection state according to a frequency band used; 4. The antenna device according to claim 3.

6. The feeding antenna element is A base having a power supply point; An extension portion extending from an end of the base portion on both sides; having 2. The antenna device according to claim 1.

7. The length of the first portion of the parasitic antenna element is longer than the length of the powered antenna element.

2. The antenna device according to claim 1.

8. a plurality of connection parts connected between the parasitic antenna element and a ground; The plurality of connection portions include a first connection portion provided between one end of the first portion of the parasitic antenna element and a ground; a second connection portion provided between the other end of the first portion of the parasitic antenna element and a ground; Including, 2. The antenna device according to claim 1.

9. the plurality of connection portions include a third connection portion provided between a tip end of the second portion of the parasitic antenna element opposite to the first portion and ground, 9. The antenna device according to claim 8.

10. The parasitic antenna element has a resonant frequency lower than a resonant frequency of the powered antenna element.

2. The antenna device according to claim 1.

11. an additional parasitic antenna element electrically coupled to the powered antenna element and having a resonant frequency different from the resonant frequency of the powered antenna element and the resonant frequency of the parasitic antenna element; 2. The antenna device according to claim 1.

12. A substrate on which the additional parasitic antenna element is provided, the substrate, the powered antenna element, and the additional parasitic antenna element are accommodated in the housing; the additional parasitic antenna element is electrically coupled to the powered antenna element via the substrate; 12. The antenna device according to claim 11.

13. The additional parasitic antenna element has a resonant frequency lower than a resonant frequency of the powered antenna element.

12. The antenna device according to claim 11.

14. A feeding antenna element; a housing including a parasitic antenna element extending so as to be electrically coupled to the powered antenna element and having a resonant frequency different from that of the powered antenna element; Equipped with A communication device, comprising: The parasitic antenna element is a first portion extending along an extension direction of the feeding antenna element so as to generate capacitive coupling between the feeding antenna element and the first portion; a second portion extending adjacent to the first portion; Including, The communication device performs communication using the power supply antenna element. Communications equipment.

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