Antenna device, imaging device, and control method

Abstract

An antenna device (1) comprises: an antenna resonant element (10); an antenna power supply circuit board (20) that provides power to the antenna resonant element (10); and a power supply point movement mechanism (30) that is for moving, in a continuous manner on the antenna resonant element (10), a power supply point (13a) for the power provided to the antenna resonant element (10).

Description

[Technical Field]

[0001] The present disclosure relates to an antenna device, an imaging device, and a control method. [Background technology]

[0002] For example, Patent Document 1 discloses a technique for controlling the frequency characteristics of an antenna by switching between a plurality of pre-provided power feed locations (power feed points). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-273090 Summary of the Invention [Problem to be solved by the invention]

[0004] The control of Patent Document 1 lacks flexibility because it switches power supply points discretely.

[0005] An object of one aspect of the present disclosure is to provide an antenna device, an imaging device, and a control method that are capable of flexibly controlling the frequency characteristics of an antenna. [Means for solving the problem]

[0006] An antenna device according to one aspect of the present disclosure includes an antenna resonating element, an antenna feed circuit board that supplies power to the antenna resonating element, and a feed point moving mechanism that continuously moves the power feed point to the antenna resonating element on the antenna resonating element.

[0007] An imaging device according to one aspect of the present disclosure includes an imaging element, an antenna resonating element, an antenna feed circuit board that supplies power to the antenna resonating element, and a power feed point moving mechanism that continuously moves the power feed point to the antenna resonating element on the antenna resonating element.

[0008] A control method according to one aspect of the present disclosure includes continuously moving, on the antenna resonating element, a point at which power is supplied from an antenna feed circuit board to the antenna resonating element. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an exploded perspective view showing an example of a schematic configuration of an antenna device according to an embodiment. [Figure 2] 1 is a diagram illustrating an example of a schematic configuration of a power supply point moving mechanism and its surroundings. FIG. [Figure 3] 10A and 10B are diagrams illustrating an example of a schematic configuration of a power supply point moving mechanism and a contact portion. [Figure 4] 10A and 10B are diagrams illustrating an example of a schematic configuration of a power supply point moving mechanism and a contact portion. [Figure 5] 10A and 10B are diagrams illustrating an example of a schematic configuration of a power supply point moving mechanism and a contact portion. [Figure 6] 10A and 10B are diagrams illustrating an example of a schematic configuration of a power supply point moving mechanism and a contact portion. [Figure 7] FIG. 10 is a diagram illustrating an example of non-contact coupling. [Figure 8] FIG. 2 is a diagram illustrating an example of a schematic configuration of an antenna feeder circuit board. [Figure 9] 1 is a diagram illustrating an example of a schematic configuration of an antenna device capable of switching antenna lengths. [Figure 10] FIG. 2 is a diagram illustrating an example of a schematic configuration of an antenna length switching circuit. [Figure 11] FIG. 2 is a diagram illustrating an example of a schematic configuration of an antenna length switching circuit. [Figure 12] 10A and 10B are diagrams conceptually illustrating examples of frequency characteristics of an antenna resonating element. [Figure 13] 10A and 10B are diagrams conceptually illustrating examples of frequency characteristics of an antenna resonating element. [Figure 14] 10A and 10B are diagrams conceptually illustrating examples of frequency characteristics of an antenna resonating element. [Figure 15] 10A and 10B are diagrams conceptually illustrating examples of frequency characteristics of an antenna resonating element. [Figure 16] FIG. 1 is an example of a block diagram of an antenna device. [Figure 17] FIG. 1 is an example of a block diagram of a detection circuit. [Figure 18] 5 is a flowchart showing an example of a process (control method) executed in the antenna device. [Figure 19] 5 is a flowchart showing an example of a process (control method) executed in the antenna device. [Figure 20] 5 is a flowchart showing an example of a process (control method) executed in the antenna device. [Figure 21] 5 is a flowchart showing an example of a process (control method) executed in the antenna device. [Figure 22] 5 is a flowchart showing an example of a process (control method) executed in the antenna device. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In each of the following embodiments, unless otherwise specified, the same components are designated by the same reference numerals, and redundant description will be omitted.

[0011] The present disclosure will be described in the following order: 1. Embodiment 1.1 Example of the schematic configuration of an antenna device 1.2 Example of the schematic configuration of an antenna device that can switch antenna lengths 1.3 Examples of processes (control methods) executed in the antenna device 1.4 Application Examples 2. Effects

[0012] 1. Embodiment 1.1 Example of the schematic configuration of an antenna device FIG. 1 is an exploded perspective view showing an example of the schematic configuration of an antenna device according to an embodiment. An XYZ coordinate system is shown in the figure. Each element of the antenna device is shown exploded in the Z-axis direction. The antenna device 1 shown in FIG. 1 is a device capable of controlling the frequency characteristics of an antenna. The "antenna frequency characteristics" may include various characteristics such as the antenna's resonant frequency and frequency-antenna radiation efficiency characteristics. The antenna device 1 shown in FIG. 1 includes an antenna resonant element 10, an antenna feed circuit board 20, a feed point moving mechanism 30, and a contact portion 40.

[0013] Antenna resonating element 10 is a part (element, radiator) that transmits and receives electromagnetic waves in a frequency band that mainly includes the resonant frequency. In this example, antenna resonating element 10 is a slot antenna that includes ground plate 11 with slot 12 formed therein.

[0014] Ground plate 11 forms antenna resonating element 10. In this example, ground plate 11 has a flat plate shape with its surface direction aligned with the XY plane. One surface and the other surface of ground plate 11 (the surface on the positive Z-axis side and the surface on the negative Z-axis side) are shown as front surface 11a and back surface 11b. Ground plate 11 is electrically conductive. Examples of materials for ground plate 11 include metals such as magnesium and gold.

[0015] Slot 12 is provided in ground plate 11. Slot 12 extends to have a length suitable for a desired frequency band. Examples of frequency bands include the 2.4 GHz band, the 5 GHz band, and the 6 GHz band. If the wavelength of the center frequency of the frequency band is λ, the length of slot 12 is set to, for example, λ / 2. Slot 12 may be formed by cutting out (providing a slit) ground plate 11. Slot 12 may be filled with a resin such as plastic, or may be filled with ceramic. Note that slot 12 is not limited to the rectangular shape shown in FIG. 1 and may have various shapes. The same applies to the shape of antenna resonating element 10.

[0016] The area on ground plane 11 where power is fed is referred to as feed area 13 and illustrated. Feed area 13 is a collection of countless potential feed points. Among the countless potential feed points, the location where power is fed during use (transmission and reception) is referred to as feed point 13a and illustrated. Feed point 13a is the point where power is fed from antenna feed circuit board 20 to antenna resonating element 10. The feed point may be a location on antenna resonating element 10 that is electrically coupled to antenna feed circuit board 20. "Electrically coupled" refers to both a physical connection between antenna resonating element 10 and antenna feed circuit board 20, either directly or via another member, and an electrical connection between antenna resonating element 10 and antenna feed circuit board 20 despite being physically separated by a gap. Feed area 13 is located on back surface 11b of ground plane 11 (the surface facing antenna feed circuit board 20). In this example, antenna resonating element 10 is a slot antenna, so feed area 13 is located on both sides of slot 12 (on both sides of the slot line). Feed area 13 extends in the plane direction of ground plane 11 (X-axis direction and Y-axis direction), and therefore has countless feed points continuously in the extension direction. Note that in the embodiment, the extension direction of feed area 13 will be described, particularly the antenna longitudinal direction (X-axis direction).

[0017] Antenna feeder circuit board 20 supplies a transmission signal (or an outgoing signal) to antenna resonating element 10 and processes a received signal received by antenna resonating element 10 (a general term for a board on which contact structures, excluding resonating elements, are mounted). Examples of received signal processing include detection, frequency conversion, and demodulation of the received signal, which are performed using, for example, an RFIC. Processing of the demodulated baseband signal may also be included in the received signal processing. Antenna feeder circuit board 20 is mounted on substrate 21. Substrate 21 has a flat plate shape with its surface direction aligned with the XY plane. One and the other surfaces of substrate 21 (the surface facing the positive Z-axis direction and the surface facing the negative Z-axis direction) are illustrated as front surface 21a and back surface 21b. Front surface 21a of substrate 21 faces back surface 11b of base plate 11. These two surfaces may be parallel to each other. Substrate 21 may be insulating. Examples of materials for substrate 21 include resin, ceramics, and the like. In addition to the spring 41 described below, various elements (not shown) are provided on the substrate 21. Examples of the elements include a power supply, a frequency conversion circuit, a modulation / demodulation circuit, an amplifier circuit, a filter, a switch, and a transmission line.

[0018] The power feed point moving mechanism 30 continuously moves the power feed point 13a on the antenna resonating element 10 in various ways, as described below. The range of movement of the power feed point 13a may correspond to the power feed area 13 described above. In one embodiment, the power feed point moving mechanism 30 moves the power feed point 13a by adjusting the positional relationship between the antenna resonating element 10 and the antenna feed circuit board 20. For example, the power feed point moving mechanism 30 may adjust the positional relationship between the antenna resonating element 10 and the antenna feed circuit board 20 by moving the antenna feed circuit board 20. In this case, the power feed point moving mechanism 30 may move the antenna feed circuit board 20 in a direction parallel to the plane (X-axis direction and Y-axis direction) defined by the antenna resonating element 10 (XY plane), or in a direction perpendicular to the plane (Z-axis direction). In this example, the plane defined by the antenna resonating element 10 is a plane that includes the longitudinal direction (X-axis direction) and the lateral direction (Y-axis direction) of the slot 12. When antenna resonating element 10 has a plate shape, it is a plane including the surface of the plate shape (for example, front surface 11a or back surface 11b of ground plate 11). In the embodiment, the movement direction of antenna feeder circuit board 20 will be described, particularly in the antenna longitudinal direction (X-axis direction). In the example shown in FIG. 1 , feed point movement mechanism 30 is a deformation mechanism 31. Specifically, four deformation mechanisms 31 are arranged between ground plate 11 and substrate 21 in the Z-axis direction so as to surround contact portion 40 (described later). Each deformation mechanism 31 is, for example, contact-connected and fixed to ground plate 11 and substrate 21, and is configured so that its height (length in the Z-axis direction) can be changed. Changing the height of deformation mechanism 31 moves antenna feeder circuit board 20 in the Z-axis direction. Examples of deformation mechanisms 31 include a piezoelectric actuator, an electric actuator, and a servo mechanism. However, various other mechanisms may be used as deformation mechanisms 31.

[0019] Contact portion 40 is provided between antenna resonating element 10 and antenna feeder circuit board 20 and is in contact with and connected to antenna resonating element 10 and antenna feeder circuit board 20. Contact portion 40 is conductive and therefore electrically connects antenna resonating element 10 and antenna feeder circuit board 20. In the Z-axis direction, one end of contact portion 40 (the end on the positive Z-axis side) is in contact with feed area 13. This contact point is feed point 13a. The other end of contact portion 40 (the end on the negative Z-axis side) is in contact with antenna feeder circuit board 20. In the example shown in FIG. 1 , contact portion 40 is a spring 41. Two springs 41 are disposed (fixed) at positions on antenna feeder circuit board 20 where transmission signals are output. Contact portion 40 may be formed integrally with antenna feeder circuit board 20.

[0020] The above-described antenna device 1 is assembled and used such that antenna resonating element 10 and antenna feed circuit board 20 are connected via contact portion 40 (spring 41). As a result, a transmission signal from antenna feed circuit board 20 is supplied to feed point 13a, exciting antenna resonating element 10. Here, in antenna device 1, feed point 13a is moved by feed point moving mechanism 30 (deformation mechanism 31) and contact portion 40 (spring 41). This will be further described with reference to FIG. 2.

[0021] FIG. 2 is a diagram illustrating an example of a schematic configuration of the power feed point moving mechanism and its surroundings. FIG. 2 illustrates ground plate 11, substrate 21, deformation mechanism 31, and spring 41 as viewed from the Y-axis direction. In the figure, several arrows are shown conceptually indicating the movement (deformation) directions of deformation mechanism 31 and spring 41. Spring 41 is provided between ground plate 11 and substrate 21 in the Z-axis direction. Spring 41 elastically deforms so that the contact point with antenna resonating element 10 moves in the antenna longitudinal direction (X-axis direction) in response to changes in the distance between antenna resonating element 10 and antenna feed circuit board 20 (length in the Z-axis direction). In this example, spring 41 has a V-shape including first portion 41a and second portion 41b. First portion 41a and second portion 41b may have a plate shape (see FIG. 1). First portion 41a is fixed to substrate 21. The second portion 41b starts at the connection point with the first portion 41a and extends toward the ground plate 11 while being inclined with respect to the Z-axis direction. The tip of the first portion 41a contacts the rear surface 11b of the ground plate 11. The contact point between the first portion 41a and the ground plate 11 is the power supply point 13a. As described above, when the height of the deformation mechanism 31 changes, the spring 41 deforms in the direction of the angle α, and the power supply point 13a, which is the contact point between the first portion 41a and the ground plate 11, moves continuously in the X-axis direction on the rear surface 11b. Naturally, the spring 41 may be provided so that the power supply point 13a moves continuously in the Y-axis direction instead of or in addition to the X-axis direction. The same applies to the examples shown in Figures 3 to 7, which will be described later.

[0022] Various configurations other than the above-described deformation mechanism 31 and spring 41 may be used for the power feed point moving mechanism 30 and the contact portion 40. Some examples will be described with reference to Fig. 3 to Fig. 6. Fig. 3 to Fig. 6 are diagrams showing examples of the schematic configuration of the power feed point moving mechanism and the contact portion.

[0023] The power supply point moving mechanism and contact portion illustrated in FIG. 3 are a spring 32 and a rotation mechanism 42. The springs 32 are provided on both sides of the substrate 21 so as to expand and contract in the X-axis direction. For example, the substrate 21 moves in the X-axis direction by expanding and contracting the springs 32 using a piston mechanism or the like (not shown). The rotation mechanism 42 includes a base 42a and a rotation portion 42b. The base 42a is fixed on the substrate 21. The rotation portion 42b rotates and moves on the base plate 11 while contacting the rear surface 11b of the base plate 11. The rotation portion 42b has, for example, a spherical shape (ball shape). As the rotation mechanism 42 moves in the X-axis direction together with the substrate 21, the power supply point 13a moves continuously in the X-axis direction on the rear surface 11b.

[0024] 4 is a belt conveyor 33 and the above-described rotation mechanism 42. The belt conveyor 33 supports the rear surface 21b of the substrate 21 and moves the substrate 21 in the X-axis direction. The rotation mechanism 42 moves in the X-axis direction together with the substrate 21, so that the power supply point 13a moves continuously in the X-axis direction on the rear surface 11b.

[0025] The power supply point moving mechanism and contact portion illustrated in FIG. 5 are the linear motor mechanism 34 and the rotation mechanism 42 described above. The linear motor mechanism 34 includes a magnet 34a and a magnet 34b. The magnet 34a is provided on the rear surface 21b of the substrate 21. The magnet 34b is a pair of magnets provided on either side of the magnet 34a in the X-axis direction. The magnet 34a moves in the X-axis direction by controlling the magnetic fields generated by the magnets 34a and 34b. For example, if the magnets 34a and 34b are electromagnets, the magnetic field control is electrically controlled. As the substrate 21 moves in the X-axis direction together with the magnet 34a, the power supply point 13a moves continuously in the X-axis direction on the rear surface 11b.

[0026] The contact portion illustrated in FIG. 6 is spring 43. Spring 43 rotates on the antenna resonating element 10 side, starting from antenna feed circuit board 20, so that the contact point with antenna resonating element 10 moves in the antenna longitudinal direction. Such spring 43 also functions as a feed point moving mechanism. In this example, spring 43 includes base 43a and protrusion 43b. Base 43a is fixed to front surface 21a of substrate 21. Protrusion 43b is expandable in its extension direction and rotates on base 43a as a starting point while contacting back surface 11b of base plate 11. As protrusion 43b rotates on base 43a as a starting point, feed point 13a moves continuously in the X-axis direction on back surface 11b.

[0027] The above describes an example in which antenna resonating element 10 and antenna feeder circuit board 20 are physically and electrically connected via contact portion 40. However, as described above, antenna resonating element 10 and antenna feeder circuit board 20 may be non-contact coupled while being physically separated from each other with a gap therebetween. This will be described with reference to FIG. 7, which shows an example of non-contact coupling.

[0028] FIG. 7 shows how antenna resonating element 10 and antenna feeder circuit board 20 are electrically coupled without contact. Substrate 21 of antenna feeder circuit board 20 has metal pattern 21c. Metal pattern 21c is electrically coupled to a metal portion of antenna resonating element 10, for example, through capacitive coupling between antenna resonating element 10. In this example, the metal portion of antenna resonating element 10 is ground plate 11. However, a metal plate (not shown) provided separately from ground plate 11 may also be used as the metal portion. The position of strongest coupling (the center of the non-contact coupling in this example) is shown as feed point 13a. Feed point 13a can be moved by controlling the capacitance between antenna resonating element 10 (the metal portion of the antenna) and metal pattern 21c. For example, by moving substrate 21 using one of the various feed point moving mechanisms 30 described above and changing the facing area and distance between antenna resonating element 10 and metal pattern 21c, feed point 13a can be continuously moved in the X-axis direction on back surface 11b. If the surface of the substrate 21 is protected by being covered with a resist or the like, the resist or the like may be removed (opened) so that the metal pattern 21c is exposed.

[0029] The power feed point moving mechanisms and contact portions shown in Figures 2 to 7 may be used in appropriate combination. In antenna device 1, the frequency characteristics of antenna resonating element 10 can be flexibly controlled by continuously moving power feed point 13a. The principle of controlling the frequency characteristics of antenna resonating element 10 by moving power feed point 13a can be summarized as follows: the antenna can radiate at a specific frequency by matching the impedance at the power feed point with the antenna length. Moving power feed point 13a changes the frequency at which impedance matching can be achieved, and the radiated frequency changes from the frequency before the movement.

[0030] Contact portion 40 may be selected from a plurality of portions (contact portion candidates) that contact antenna resonating element 10 at different positions. In the case of an antenna that is fed at two points, such as a slot antenna or a notch antenna, the plurality of portions refers to, for example, one or more pairs of portions that are provided separately from the pair of contact portions 40 shown in FIG. 1. In the case of an antenna that is fed at one point, such as a patch antenna, the plurality of portions refers to one or more separately provided portions. A configuration in which contact portion 40 is selected from a plurality of portions will be described with reference to FIG. 8.

[0031] FIG. 8 is a diagram illustrating an example of the schematic configuration of an antenna feed circuit board. Antenna feed circuit board 201 illustrated in FIG. 8 includes switches 261 to 263, a power supply 272, and switches 281 to 283. Furthermore, springs 411 to 413 are provided at the output position of antenna feed circuit board 201 as examples of the above-described portions (candidates for contact portions). In this example, each of springs 411 to 413 has the same configuration as spring 41 described above with reference to FIG. 2. In antenna feed circuit board 201, switch 261, power supply 272, and switch 281 are connected in series between a pair of springs 411. Power supply 272 generates the above-described transmission signal. Switch 262, power supply 272, and switch 282 are connected in series between a pair of springs 412. Switch 263, power supply 272, and switch 283 are connected in series between a pair of springs 413. The three series-connected circuits share only the power supply 272, and other corresponding parts are provided in parallel with respect to the power supply 272. The springs 411 to 413 are arranged at different positions on the antenna feed circuit board 201 (for example, on the board 21 in FIG. 1). The pair of springs 411, the pair of springs 412, and the pair of springs 413 may be arranged at different positions in the antenna longitudinal direction (X-axis direction).

[0032] The connection state between the springs 411 to 413 and the power source 272 (i.e., the contact portion used for power feeding) is switched by the switches 261 to 263 and the switches 281 to 283. Of the springs 411 to 413, the contact portion between the springs 411 to 413 used for power feeding and the ground plate 11 functions as the contact portion 40 that provides the power feeding point 13a. As described above, the springs 411 to 413 are arranged in different positions, and therefore, by selecting the spring used for power feeding from the springs 411 to 413 (by switching the position of the contact portion 40), the position of the power feeding point 13a can be changed. This further widens the adjustable frequency range.

[0033] It should be noted that other elements not shown (such as the frequency conversion circuit, modulation / demodulation circuit, amplifier circuit, filter, switch, transmission line, etc., as previously mentioned) may also be included in antenna feeder circuit board 201.

[0034] The above-described configuration in which the power supply portion 13a can be switched using a plurality of portions (contact portion candidates) may be appropriately combined with the configuration in which the power supply portion 13a can be continuously moved as previously described with reference to Figures 1 to 7. This further widens the adjustable frequency range.

[0035] 1.2 Example of the schematic configuration of an antenna device that can switch antenna lengths By also using an antenna length switching circuit that changes the electrical length of antenna resonating element 10, it is possible to control the frequency of slot 12 over an even wider range. This will be described with reference to FIG.

[0036] Fig. 9 is an exploded perspective view showing an example of the schematic configuration of an antenna device that is also capable of switching antenna lengths. For convenience of explanation, the antenna device shown in Fig. 9 will also be referred to as antenna device 1, as in Fig. 1 described above. The antenna device 1 shown in Fig. 9 differs from the case of Fig. 1 in that it further includes an antenna length switching circuit 50. The antenna length switching circuit 50 is connected to the antenna resonating element 10.

[0037] The points on the ground plate 11 to which the antenna length switching circuit 50 is connected are shown in the figure as contacts 14. In this example, the contacts 14 are located on both sides of the slot 12 on the back surface 11b of the ground plate 11. The contacts 14 are located, for example, near (including) the center of the slot 12 in the X-axis direction.

[0038] Antenna length switching circuit 50 switches the electrical length of antenna resonating element 10. The electrical length is switched by switching at least one of the physical length and the electrical length. Antenna length switching circuit 50 may be a variable impedance circuit. In this case, the electrical length of antenna resonating element 10 changes as the impedance of antenna length switching circuit 50 changes. FIG. 9 shows, among the components of antenna length switching circuit 50, substrate 51 and contact terminal 52. Contact terminal 52 contacts contact 14 of antenna resonating element 10, thereby connecting antenna length switching circuit 50 to antenna resonating element 10. In this example, contact terminal 52 is a conductive probe that is elastically stretchable in the Z-axis direction. In addition, various other elements (not shown) that make up antenna length switching circuit 50 are provided on substrate 51. One side and the other side of substrate 51 are illustrated as front side 51a and back side 51b. An example of the configuration of the antenna length switching circuit 50 will be described with reference to FIGS.

[0039] Fig. 10 is a diagram showing an example of the schematic configuration of an antenna length switching circuit. Antenna length switching circuit 501 shown in Fig. 10 includes contact terminal 521, switch 561, switch 571, and reactance 581. In this example, contact terminal 521 has the same configuration as contact terminal 52 described above with reference to Fig. 9. Reactance 581 may be either an inductor or a capacitor, or may include both an inductor and a capacitor. Reactance 581 may be a variable reactance. Switch 561 and switch 571 and reactance 581 connected in series are connected in parallel between the pair of contact terminals 521.

[0040] Switches 561 and 571 switch the connection state between a pair of contact terminals 521 (i.e., the impedance between contacts 14 on both sides of slot 12). When switch 561 is ON, contact terminals 521 are shorted, and therefore antenna resonating element 10 has an electrical length given by the length from feed point 13a to contact 14. When switch 571 is ON (switch 561 is OFF), a circuit impedance (reactance 581) appears at contact terminal 521, and therefore antenna resonating element 10 has an electrical length given by reactance 581 being connected in parallel (in shunt) to the slot line.

[0041] Fig. 11 is a diagram showing an example of the schematic configuration of an antenna length switching circuit. The antenna length switching circuit 502 shown in Fig. 11 includes contact terminals 522 to 524, switches 562 to 564, a reactance 572, and switches 582 to 584. In this example, the contact terminals 522 to 524 have the same configuration as the contact terminal 52 described above with reference to Fig. 9. Between the pair of contact terminals 522, the switch 562, the reactance 572, and the switch 582 are connected in series. Between the pair of contact terminals 523, the switch 563, the reactance 572, and the switch 583 are connected in series. Between the pair of contact terminals 524, the switch 564, the reactance 572, and the switch 584 are connected in series. These three series-connected circuits share only the reactance 572, and the other corresponding parts are provided in parallel with respect to the reactance 572. The contact terminals 522 to 524 are arranged at different positions (on the substrate 51) of the antenna length switching circuit 50. The pair of contact terminals 522, the pair of contact terminals 523, and the pair of contact terminals 524 may be arranged at different positions in the antenna longitudinal direction.

[0042] Switches 562-564 and switches 582-584 switch the connection state between contact terminals 522-524 and reactance 572 (the contact terminals used to switch the electrical length of antenna resonating element 10). That is, from contact terminals 522-524, a contact terminal at which the impedance of antenna length switching circuit 501 (e.g., reactance 572) appears is selected. As described above, contact terminals 522-524 are arranged in different positions. By switching the contact terminal used to switch the electrical length of antenna resonating element 10, the position of reactance 572 connected in parallel to antenna resonating element 10 can be changed. This allows for more precise adjustment of the electrical length of antenna resonating element 10.

[0043] 10 and 11 may be used in combination as appropriate. By changing (continuously moving and switching) feed point 13a using antenna feed circuit board 20, feed point moving mechanism 30, and contact portion 40, as well as by switching the electrical length of antenna resonating element 10 using antenna length switching circuit 50, the frequency characteristics of antenna resonating element 10 can be controlled even more flexibly. Since the frequency of the slot antenna with the electrical length of antenna resonating element 10 is determined approximately by λ / 2, the slot length can be electrically shortened by short-circuiting the antenna midway or by inserting a reactance, allowing for a large change in frequency.

[0044] Returning to FIG. 9, the antenna device 1 described above is assembled and used such that, compared to the previously described case of FIG. 1, antenna resonating element 10 and antenna length switching circuit 50 are further connected.

[0045] The following describes an example of the roles of antenna feeder circuit board 20 and antenna length switching circuit 50 in antenna device 1. In one embodiment, antenna feeder circuit board 20 is used for fine tuning the frequency characteristics of antenna resonating element 10 (e.g., changing to a different channel within the same frequency band, ensuring bandwidth, etc.). This is because it facilitates precise control of feed point 13a. An example of fine tuning of the frequency characteristics is changing to a different channel within the same frequency band (each channel within the 5 GHz band). On the other hand, antenna length switching circuit 50 is used for large adjustment of the frequency characteristics of antenna resonating element 10 (e.g., changing to a different frequency band). This is because it facilitates large-scale switching of the electrical length of antenna resonating element 10. An example of large-scale adjustment of the frequency characteristics is changing to a different operating frequency band (e.g., 2.4 GHz band, 5 GHz band, etc.). However, these uses are merely examples, and antenna feeder circuit board 20 and antenna length switching circuit 50 may be used appropriately depending on the required degree of adjustment of the frequency characteristics of antenna resonating element 10. A hybrid configuration including both antenna feed circuit board 20 and antenna length switching circuit 50 allows for more flexible control of the frequency characteristics of antenna resonating element 10. Hereinafter, the method of fine-tuning the frequency characteristics by moving feed point 13a on antenna feed circuit board 20 or the like is sometimes referred to as the "feed movement method." The method of largely adjusting the frequency characteristics by switching the electrical length of antenna resonating element 10 using antenna length switching circuit 50 is sometimes referred to as the "shunt method."

[0046] Examples of configurations using the feed moving method and the shunt method are summarized below. Examples of configurations using the feed moving method (such as the antenna feed circuit board 20) include a configuration in which the power feed point is switched using a switch, as previously described with reference to FIG. 8, and a configuration in which the power feed position is continuously moved, as previously described with reference to FIGS. 1 to 7. Examples of configurations using the shunt method (such as the antenna length switching circuit 50) include a configuration in which reactance (inductor and / or capacitor) is switchable, as previously described with reference to FIGS. 10 and 11, a configuration in which reactance is used as a filter, and a configuration in which an LPF and an HPF are used as filters for switching the power feed point. In the latter configuration in which an LPF and an HPF are used, specifically, an LPF is inserted to feed power on the low-frequency side, and an HPF is inserted to feed power on the high-frequency side. This makes it possible to feed power at the optimal position for each frequency band. The antenna device 1 may have a hybrid configuration that combines these various configurations.

[0047] Some examples of controlling frequency characteristics will be described with reference to Figures 12 to 15. Figures 12 to 15 are diagrams conceptually showing examples of frequency characteristics of antenna resonating elements. The horizontal axis of the graph represents frequency, and the vertical axis represents antenna radiation efficiency.

[0048] In Figure 12, the dashed graph lines SET_A, SET_B, and SET_C represent the antenna radiation efficiencies of three antenna resonant elements with individual variations. By fine-tuning the frequency characteristics of each element using, for example, a feed movement method, it is possible to align them to the frequency characteristics shown by the solid graph line SET_ABC. In this way, the frequency deviation caused by individual variations can be corrected to the appropriate frequency.

[0049] In FIG. 13, the dashed graph line BW indicates the antenna radiation efficiency of the frequency characteristics covering the entire frequency band (e.g., the 5 GHz band). The solid graph lines CH_A and CH_B indicate the antenna radiation efficiency of the frequency characteristics covering some channels within the frequency band. With frequency characteristics covering a wide range, as shown by graph line BW, the antenna radiation efficiency is generally low. However, by fine-tuning the frequency characteristics covering some channels, for example, using a feed shift method, a higher antenna radiation efficiency can be obtained, as shown by graph lines CH_A and CH_B. This is useful when other channels are congested and the transfer rate is low.

[0050] The same is true when the graph line BW in Figure 13 indicates the antenna radiation efficiency in a wide frequency band including multiple bands (for example, including the 5 GHz band and the 6 GHz band). That is, the antenna radiation efficiency of the frequency characteristics covering the entire graph line BW is generally low. In contrast, by adjusting the frequency characteristics covering a specific band (for example, the 6 GHz band) using, for example, a feed shift method, a higher antenna radiation efficiency can be obtained. This is useful when other bands (for example, the 5 GHz band) are congested and the transfer rate is low. Similar control can also be achieved by adjusting the frequency characteristics using a shunt method.

[0051] In FIG. 14, the solid graph line N indicates the antenna radiation efficiency under normal conditions. The dashed graph line D indicates the antenna radiation efficiency when it has deteriorated due to the influence of a nearby object (such as a human body). Examples of the influence of a nearby object include frequency shifts and a decrease in antenna radiation efficiency. For example, by fine-tuning the frequency characteristics using a feed movement method, the antenna radiation efficiency that has deteriorated as shown by graph line D can be restored to the antenna radiation efficiency shown by graph line N.

[0052] 15, graph line BW1 represents the antenna radiation efficiency of a frequency characteristic covering the entirety of a certain frequency band (e.g., the 2.4 GHz band). Graph line BW2 represents the antenna radiation efficiency of a frequency characteristic covering the entirety of another frequency band (e.g., the 5 GHz band). By significantly adjusting the frequency characteristic, for example, using a shunt method, the frequency characteristic of antenna resonating element 10 can be significantly switched from the frequency band shown by graph line BW1 to the frequency band shown by graph line BW2.

[0053] Further configuration of the antenna device 1 will be described with reference to FIG.

[0054] 16 is an example of a block diagram of an antenna device. In addition to the antenna resonating element 10, antenna feed circuit board 20, feed point moving mechanism 30, contact portion 40, and antenna length switching circuit 50 described above, antenna device 1 includes a detection circuit 60 and a control unit 70. Detection circuit 60 and control unit 70 are provided on substrate 21, for example. Detection circuit 60 and control unit 70 will be further described.

[0055] The detection circuit 60 detects the state of the antenna device 1. The detection circuit 60 will be further described with reference to FIG.

[0056] 17 is an example of a block diagram of the detection circuit 60. In this example, the detection circuit 60 includes a feedback circuit 61, a proximity sensor circuit 62, a reception level detection circuit 63, and a mode selection circuit 64.

[0057] Feedback circuit 61 measures the state of antenna resonating element 10 and outputs the measurement results. Examples of the output of feedback circuit 61 include information indicating the strength (magnitude) and / or phase of the reflection coefficient (the ratio of reflected power to input power, typically expressed as S11 or return loss) of antenna resonating element 10, and information indicating whether the target frequency (the frequency desired for communication (use)) is in an optimal state. The target frequency is not limited to a specific frequency, but may refer to a frequency range (target channel) including that frequency. The optimal state is, for example, a state in which the reflection coefficient is in a range (including the minimum value) smaller than a predetermined value. Various known circuits may be employed as such feedback circuit 61.

[0058] The proximity sensor circuit 62 detects an object (proximate object) in proximity to the antenna resonating element 10 and outputs the detection result. The object may be an object that can affect the frequency characteristics of the antenna resonating element 10 (such as frequency shift or reduction in antenna radiation efficiency), such as a part of the user's body (such as a finger). An example of the output from the proximity sensor circuit 62 is the positional relationship (distance, direction, etc.) between the antenna resonating element 10 and the object. It is preferable to calibrate the proximity sensor circuit 62 in advance so that the detection result from the proximity sensor circuit 62 indicates the positional relationship between the antenna resonating element 10 and the object. Various known circuits (including proximity sensors) may be used as the proximity sensor circuit 62.

[0059] The reception level detection circuit 63 detects the reception level of the antenna resonating element 10 and outputs the detection result. The reception level is information indicating the strength of the reception sensitivity (or the strength of the received signal). Various known circuits may be employed as the reception level detection circuit 63.

[0060] The mode selection circuit 64 accepts a mode selection and outputs a mode selection result. The mode selection includes selection of a communication mode using the antenna resonating element 10. Examples of modes are a distance-priority mode and a speed-priority mode. When the distance-priority mode is selected, a frequency band that provides a longer communication distance (e.g., the 2.4 GHz band out of the 2.4 GHz band and the 5 GHz band) is selected. When the speed-priority mode is selected, a frequency band that provides a faster communication speed (e.g., the 5 GHz band out of the 2.4 GHz band and the 5 GHz band) is selected. Another example of a mode is an indoor mode and an outdoor mode. For example, when the indoor mode is selected, a frequency band that provides a faster communication speed is selected. When the outdoor mode is selected, a frequency band that provides a longer communication distance is selected. The mode selection may be performed by a user operation. The user operation may be performed via a displayed UI realized by software, or may be performed by a physical UI (e.g., a manual dial, etc.).

[0061] 16, the control unit 70 controls the antenna device 1 based on the detection result of the detection circuit 60. The control by the control unit 70 includes control of the power feed point moving mechanism 30, control of the switches of the antenna feed circuit board 20 (such as the switch 261 in FIG. 8), control of the switches of the antenna length switching circuit 50 (such as the switch 561 in FIG. 10 and the switch 562 in FIG. 11), and control of the variable reactance. The control unit 70 may be configured to include a CPU (Central Processing Unit) and the like. A driver (not shown) required for driving the power feed point moving mechanism 30 may be used for the control.

[0062] The control unit 70 may set the required frequency adjustment amount from the output of the detection circuit 60, and may selectively use the feed movement method or the shunt method depending on the frequency adjustment amount. To set the frequency adjustment amount, for example, an algorithm, table data, or the like for obtaining the frequency adjustment amount from the output result of the detection circuit 60 may be used. The feed movement method may be used when the frequency adjustment amount is relatively small, and the shunt method may be used when the frequency adjustment amount is relatively large. A threshold judgment may be used to determine whether the frequency adjustment amount is large or small.

[0063] The control unit 70 may selectively use the feed movement method or the shunt method depending on the state of the antenna device 1 ascertained from the detection results of the detection circuit 60, regardless of the frequency adjustment amount. Examples of the state of the antenna device 1 include individual variations, a decrease in antenna radiation efficiency due to the proximity of a human body, a decrease in transfer rate due to a crowded environment, and a transfer mode switching state. These are detected from the outputs of the feedback circuit 61, the proximity sensor circuit 62, the reception level detection circuit 63, and the mode selection circuit 64. For example, individual variations, a decrease in antenna radiation efficiency due to the proximity of a human body, and a decrease in transfer rate due to a crowded environment can be addressed using the feed movement method. In this case, the control unit 70 may control the frequency characteristics of the antenna resonating element 10 using the feed movement method. In this case, the transfer mode switching state can be addressed using the shunt method. In this case, the control unit 70 may control the frequency characteristics of the antenna resonating element 10 using the shunt method.

[0064] The proper use of the feed movement method and the shunt method depending on the amount of frequency adjustment or the state of the antenna device 1 will be described later with reference to FIGS.

[0065] A more specific example of control according to the outputs of the feedback circuit 61, the proximity sensor circuit 62, the reception level detection circuit 63, and the mode selection circuit 64 will be described below.

[0066] The control unit 70 may control the frequency characteristics of the antenna resonating element 10 so that the output of the feedback circuit 61 is optimal at the target frequency. An example of the optimal state is a state in which the reflection coefficient is within a range (including the minimum value) smaller than a predetermined value, as described above. For example, the frequency characteristics of the antenna resonating element 10 are controlled so that the reflection coefficient is equal to or less than a threshold value. The threshold value is determined appropriately depending on the communication performance required of the antenna resonating element 10. The communication performance may be determined based on requirements such as the amount of data to be transmitted and the time required for transmission. The frequency characteristics of the antenna resonating element 10 may be searched and controlled to minimize the reflection coefficient. Alternatively, a data table may be prepared that describes the relationship between the target frequency and the position of the power feed point 13a and / or the state of the antenna feed circuit board 20 (e.g., the state of the switch). Such a data table may be created based on experimental data, design data, or the like. The control unit 70 may control the frequency characteristics of the antenna resonating element 10 based on the output result of the feedback circuit 61 and the data table.

[0067] Controller 70 may control the frequency characteristics of antenna resonating element 10 to reduce the influence of nearby objects. In this case, controller 70 controls the frequency characteristics of antenna resonating element 10 according to the positional relationship between antenna resonating element 10 and nearby objects, as indicated by the output result of proximity sensor circuit 62. For example, a data table may be prepared that associates the position of nearby objects with the position of power feed point 13a and / or the state of antenna feed circuit board 20 (e.g., switch state) that can reduce the influence of nearby objects. Such a data table may be created based on experimental data, design data, etc. Controller 70 may control the frequency characteristics of antenna resonating element 10 based on the output result of proximity sensor circuit 62 and the data table. In such control, fine adjustment of the frequency characteristics using a feed movement method may be particularly effective.

[0068] The control unit 70 may control the frequency characteristics of the antenna resonating element 10 so as to improve the reception level. In this case, the control unit 70 controls the frequency characteristics of the antenna resonating element 10 so as to increase the reception level of the antenna resonating element 10 indicated in the output result of the reception level detection circuit 63. For example, the frequency characteristics of the antenna resonating element 10 are controlled so that the reception level is equal to or higher than a threshold. The threshold is determined appropriately depending on the communication performance required of the antenna resonating element 10. The communication performance may be determined depending on requirements such as the amount of transmission data and the time required for transmission. The frequency characteristics of the antenna resonating element 10 may be searched for and controlled so as to maximize the reception level.

[0069] Controller 70 may control the frequency characteristics of antenna resonating element 10 according to the mode selection result. In this case, controller 70 controls the frequency characteristics of antenna resonating element 10 according to the mode selection result indicated by the output result of mode selection circuit 64. For example, when distance-priority mode is selected, the frequency characteristics of antenna resonating element 10 are controlled to match a frequency band that provides a longer communication distance. When speed-priority mode is selected, the frequency characteristics of antenna resonating element 10 are controlled to match a frequency band that provides a faster communication speed. In such control, significant adjustment of the frequency characteristics using a shunt method may be particularly effective.

[0070] The above-described control of the frequency characteristics of antenna resonating element 10 by control unit 70 may be combined as appropriate. Control by control unit 70 may also include control using AI (Artificial Intelligence). In this case, for example, when data corresponding to the output of detection circuit 60 described above is input, a trained model generated using training data may be used to output data corresponding to the control content by control unit 70.

[0071] 1.3 Examples of processes (control methods) executed in the antenna device 18 is a flowchart showing an example of a process (control method) executed in the antenna device. In this example, in response to detection of a nearby object (such as a human body), the frequency characteristics of antenna resonating element 10 are controlled using a feed movement method, more specifically, antenna feed circuit board 20, feed point movement mechanism 30 (deformation mechanism 31), and contact portion 40 (spring 41) (FIG. 1).

[0072] In step S11, the detection result of the proximity sensor is acquired. For example, control unit 70 acquires the positional relationship between antenna resonating element 10 and a nearby object, which is indicated by the output result of proximity sensor circuit 62 of detection circuit 60.

[0073] In step S12, it is determined whether an object is in proximity. For example, the control unit 70 determines that an object is in proximity if the distance indicated in the detection result acquired in the previous step S11 is equal to or shorter than a predetermined distance. Examples of the predetermined distance include several mm to several tens of mm, several cm to several tens of cm, etc. If the object is in proximity (step S12: Yes), the process proceeds to step S13. If not (step S12: No), the process returns to step S11.

[0074] In step S13, the movement distance is set. For example, the control unit 70 sets the movement distance of the power supply point 13a according to the distance acquired in the previous step S11.

[0075] In step S14, the antenna feed circuit board is moved. For example, control unit 70 controls feed point moving mechanism 30 (deformation mechanism 31) to move substrate 21 of antenna feed circuit board 20 in the Z-axis direction.

[0076] In step S15, the spring is deformed and the power feed point moves. For example, spring 41 (FIGS. 1 and 2) is deformed, which causes power feed point 13a to move. This changes the frequency characteristics of antenna resonating element 10.

[0077] After the process of step S15 is completed, the process returns to step S11. By repeatedly executing the processes of steps S11 to S15, the frequency characteristics of antenna resonating element 10 controlled in response to the detection of a nearby object (such as a human body) are obtained as needed.

[0078] 19 is a flowchart showing an example of a process (control method) executed in the antenna device. In this example, the frequency characteristics of antenna resonating element 10 are controlled using a feed movement method, more specifically, antenna feed circuit board 20, feed point movement mechanism 30 (spring 32), and contact portion 40 (rotation mechanism 42) (FIG. 3), in accordance with the output of feedback circuit 61.

[0079] In step S21, the output of the feedback circuit is obtained. For example, control unit 70 obtains the reflection coefficient of antenna resonating element 10.

[0080] In step S22, it is determined whether or not the power feed point needs to be changed. For example, the control unit 70 determines that the power feed point needs to be changed if the reflection coefficient indicated in the output of the feedback circuit 61 obtained in the previous step S21 is greater than a predetermined value. If the power feed point needs to be changed (step S22: Yes), the process proceeds to step S23. If not (step S22: No), the process returns to step S21.

[0081] In step S23, the moving distance is set. For example, the control unit 70 sets the moving distance of the power supply point 13a so that the reflection coefficient indicated in the output of the feedback circuit 61 becomes smaller than a predetermined value.

[0082] In step S24, the antenna feed circuit board is moved. For example, the control unit 70 controls the power feed point moving mechanism 30 (spring 32) to move the board 21 of the antenna feed circuit board 20 in the X-axis direction.

[0083] In step S25, the rotation mechanism rotates, and the power feed point moves. For example, rotation mechanism 42 rotates in the X-axis direction together with substrate 21 of antenna feed circuit board 20, thereby moving power feed point 13a. This changes the frequency characteristics of antenna resonating element 10.

[0084] After the process of step S25 is completed, the process returns to step S21. By repeatedly executing the processes of steps S21 to S25, the frequency characteristics of antenna resonating element 10 controlled in accordance with the output of feedback circuit 61 are obtained as needed.

[0085] 20 is a flowchart showing an example of a process (control method) executed in the antenna device. In this example, in response to a mode selection (manual selection) using a dial, the frequency characteristics of antenna resonating element 10 are controlled using a shunt method, more specifically, antenna length switching circuit 50 (FIG. 9).

[0086] In step S31, the selected mode is acquired. For example, the control unit 70 acquires the mode selection result indicated by the output result of the mode selection circuit 64 of the detection circuit 60.

[0087] In step S32, the type of mode is determined. For example, the control unit 70 determines whether the mode acquired in the previous step S31 is the distance priority mode or the speed priority mode. If the mode is the distance priority mode, the process proceeds to step S33. If the mode is the speed priority mode, the process proceeds to step S36.

[0088] In step S33, the electrical length of the antenna is set. For example, control unit 70 sets the state of antenna length switching circuit 50 to adapt the frequency characteristics of antenna resonating element 10 to a low frequency band (e.g., 2.4 GHz band) for long-distance communication.

[0089] In step S34, the state of antenna length switching circuit 50 is switched. For example, control unit 70 controls antenna length switching circuit 50 so that the impedance of antenna length switching circuit 50 becomes almost infinite (open state). This increases the electrical length of antenna resonating element 10, and changes the frequency characteristics of antenna resonating element 10 to suit the low frequency band.

[0090] In step S35, the electrical length of the antenna is set. For example, control unit 70 sets the state of antenna length switching circuit 50 to adapt the frequency characteristics of antenna resonating element 10 to a high frequency band (e.g., 5 GHz band) for high-speed communication.

[0091] In step S36, the state of antenna length switching circuit 50 is switched. For example, control unit 70 controls antenna length switching circuit 50 so that the impedance of antenna length switching circuit 50 becomes approximately 0 (short-circuit state). This shortens the electrical length of antenna resonating element 10, and the frequency characteristics of antenna resonating element 10 change to suit the high frequency band.

[0092] After the processing of step S35 or step S36 is completed, the process returns to step S31. By repeatedly executing the processing of steps S31 to S36, the frequency characteristics of antenna resonating element 10 controlled according to the mode selection result are obtained as needed.

[0093] 21 is a flowchart showing an example of a process (control method) executed in the antenna device. In this example, the feed movement method and the shunt method are used selectively depending on the amount of frequency adjustment.

[0094] In step S41, the outputs of the detection circuits are obtained. For example, the outputs of the feedback circuit 61, the proximity sensor circuit 62, the reception level detection circuit 63, and the mode selection circuit 64 of the detection circuit 60 are obtained.

[0095] In step S42, it is determined whether the frequency adjustment amount is less than a threshold value. For example, the control unit 70 sets the necessary frequency adjustment amount from the output of the detection circuit acquired in the previous step S41, and compares it with a predetermined threshold value. If the frequency adjustment amount is less than the threshold value (step S42: Yes), the process proceeds to step S43. If not (step S42: No), the process proceeds to step S44.

[0096] In step S43, the frequency characteristics are controlled using the feed movement method, for example, by control unit 70 controlling the frequency characteristics of antenna resonating element 10 using the feed movement method so as to obtain the frequency adjustment amount used in the determination in the previous step S42.

[0097] In step S44, the frequency characteristics are controlled using the shunt method. For example, control unit 70 controls the frequency characteristics of antenna resonating element 10 using the shunt method so as to obtain the frequency adjustment amount used in the determination in the previous step S42.

[0098] After the process of step S43 or step S44 is completed, the process returns to step S41. By repeatedly executing the processes of steps S41 to S44, the frequency characteristics of antenna resonating element 10 controlled by either the feed movement method or the shunt method can be obtained as needed depending on whether the frequency adjustment amount (frequency movement range) is large or not.

[0099] Fig. 22 is a flowchart showing an example of a process (control method) executed in the antenna device. In this example, the feed movement method and the shunt method are used depending on the state of the antenna device 1 grasped from the detection result of the detection circuit 60, regardless of the frequency adjustment amount as shown in Fig. 21 above.

[0100] In step S51, the outputs of the detection circuits are obtained. For example, the outputs of the feedback circuit 61, the proximity sensor circuit 62, the reception level detection circuit 63, and the mode selection circuit 64 of the detection circuit 60 are obtained.

[0101] In step S52, the frequency characteristics are controlled using a method according to the output of the detection circuit. For example, the control unit 70 selectively uses the feed movement method or the shunt method depending on the state of the antenna device 1 determined from the detection result of the detection circuit 60 acquired in the previous step S51. Examples of the state of the antenna device 1 include the above-mentioned individual variations, a decrease in antenna radiation efficiency due to the proximity of a human body, a decrease in transfer rate due to being in a crowded environment, and a transfer mode switching state. Since the individual variations, a decrease in antenna radiation efficiency due to the proximity of a human body, and a decrease in transfer rate due to being in a crowded environment can be addressed using the feed movement method, in this case, the control unit 70 may control the frequency characteristics of the antenna resonating element 10 using the feed movement method. Since the transfer mode switching state can be addressed using the shunt method, in this case, the control unit 70 may control the frequency characteristics of the antenna resonating element 10 using the shunt method.

[0102] After the process of step S52 is completed, the process returns to step S51. By repeatedly executing the processes of steps S51 and S52, the frequency characteristics of antenna resonating element 10 controlled according to the state of antenna device 1 grasped from the detection result of detection circuit 60 are obtained as needed.

[0103] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. In the above embodiments, an example has been described in which antenna feed circuit board 20 is moved by power feed point moving mechanism 30. However, antenna resonating element 10 may move instead of antenna feed circuit board 20 or together with antenna feed circuit board 20. Various techniques (such as modified examples of power feed point moving mechanism 30) that enable such movement may be used.

[0104] In the above embodiment, a slot antenna has been described as an example of an antenna, but various antennas other than a slot antenna (such as a patch antenna or a notch antenna) may be used.

[0105] In the above embodiment, an example has been described in which antenna resonating element 10 includes one antenna, but antenna resonating element 10 may include multiple antennas.

[0106] 1.4 Application Examples The antenna device 1 described above may be incorporated into electronic devices, etc. An example of an electronic device is an imaging device. The imaging device may include an imaging element such as a CCD or CCMOS, a data processing unit that processes the imaging results of the imaging element, an output unit that outputs (including display) the processed results, an operation unit that accepts user operations, and the like. The imaging device may also include a housing that houses at least some of these components. In this case, antenna resonating element 10 may be formed using part of the housing of the imaging device. For example, by cutting out part of a metal housing to form a slot antenna, the part of the housing where the slot antenna is provided can be used as antenna resonating element 10. Antenna feed circuit board 20 may be provided within the housing. The same applies to other components such as power feed point moving mechanism 30, contact unit 40, antenna length switching circuit 50, detection circuit 60, and control unit 70.

[0107] According to the imaging device described above, for example, various pieces of information obtained from the imaging results of the imaging element can be transmitted using antenna resonating element 10. In this case, the frequency characteristics of antenna resonating element 10 can be flexibly controlled as described above.

[0108] 2. Effects The above-described antenna device 1 is specified, for example, as follows. As described with reference to FIG. 1 etc., antenna device 1 includes antenna resonating element 10, antenna feed circuit board 20, and feed point moving mechanism 30. Antenna feed circuit board 20 supplies power to antenna resonating element 10. Feed point moving mechanism 30 continuously moves feed point 13a on antenna resonating element 10. Feed point 13a is the point where power is supplied to antenna resonating element 10.

[0109] According to the above-described antenna device 1, by continuously moving feed point 13a, the frequency characteristics of antenna resonating element 10 can be controlled more flexibly than, for example, when the feed point is switched discretely.

[0110] Furthermore, since switches, lumped constant elements, etc. used to discretely switch the power feed point are no longer necessary, loss can be reduced accordingly, and a highly efficient antenna can be realized. Since the electrical coupling is not interrupted even when the power feed point 13a is moved, the power feed point 13a can be automatically moved during transmission and reception to tune the frequency characteristics.

[0111] As described with reference to FIGS. 1 to 5, etc., power feed point moving mechanism 30 (deformation mechanism 31) may move power feed point 13a by adjusting the positional relationship between antenna resonating element 10 and antenna feed circuit board 20. Power feed point moving mechanism 30 (deformation mechanism 31) as described with reference to FIGS. 1 and 2 may move power feed point 13a by moving antenna feed circuit board 20. Alternatively, power feed point moving mechanism 30 (spring 32, belt conveyor 33, and linear motor mechanism 34) as described with reference to FIGS. 3 to 5 may move power feed point 13a by moving antenna feed circuit board 20. For example, power feed point 13a can be moved continuously in this manner.

[0112] 1 to 6, etc., antenna device 1 may further include contact portion 40. Contact portion 40 may be provided between antenna resonating element 10 and antenna feeder circuit board 20, be in contact with antenna resonating element 10, and be integral with antenna feeder circuit board 20. In this case, the point of contact between antenna resonating element 10 and contact portion 40 is feed point 13a. Feed point 13a can be provided by electrically connecting antenna resonating element 10 and antenna feeder circuit board 20 via contact portion 40.

[0113] As described with reference to FIGS. 1 and 2 , feed point moving mechanism 30 moves antenna feed circuit board 20 in a direction perpendicular to antenna resonating element 10 (Z-axis direction) relative to a plane defined by antenna resonating element 10 (XY plane), and spring 41 may elastically deform so that the point of contact with antenna resonating element 10 moves in response to a change in the distance between antenna feed circuit board 20 and antenna resonating element 10. In this case, spring 41 may be configured to change an angle of inclination α relative to the plane defined by antenna feed circuit board 20 (XY plane), and angle of inclination α may change in response to a change in the distance. Spring 41 includes first portion 41a fixed to antenna resonating element 10 and second portion 41b extending from a connection point with first portion 41a at an angle relative to the vertical direction (Z-axis direction), and angle of inclination α may be the angle of inclination of second portion 41b relative to the plane defined by antenna feed circuit board 20 (XY plane). Alternatively, as described with reference to FIGS. 3 to 5, etc., rotation mechanism 42 may include base 42a connected to antenna feed circuit board 20 and rotation part 42b that contacts antenna resonating element 10 at feed point 13a and is rotatable relative to base 42a. Alternatively, as described with reference to FIG. 6, etc., spring 43 may rotate from antenna feed circuit board 20 as a starting point toward antenna resonating element 10 so that the contact point with antenna resonating element 10 moves. For example, by using such contact part 40 (spring 41, rotation mechanism 42, or spring 43), feed point 13a can be moved continuously. Since feed point 13a can be moved without moving antenna feed circuit board 20, space for moving antenna feed circuit board 20 is not required. Furthermore, by incorporating rotational motion, such as rotation mechanism 42 and spring 43, friction can be reduced.

[0114] 8 and other figures, contact portion 40 may be selected from a plurality of springs 411-413 that contact antenna resonating element 10 at different positions. By using these plurality of springs 411-413 to change the position of power feeding point 13a, the adjustable frequency range can be further expanded.

[0115] As described with reference to Figure 7 and other figures, antenna feeder circuit board 20 may have metal pattern 21c that is non-contact coupled to a metal portion (such as ground plate 11 or another metal plate) that constitutes antenna resonating element 10. In this case, the position of non-contact coupling (e.g., the center position) is feed point 13a. This allows feed point 13a to be provided even if antenna resonating element 10 and antenna feeder circuit board 20 are physically separated with a gap between them.

[0116] As described with reference to Figures 16 and 17, etc., antenna device 1 may further include detection circuit 60 and control unit 70. Detection circuit 60 may detect the state of antenna device 1. Control unit 70 may control power feed point moving mechanism 30 based on the detection result of detection circuit 60. Detection circuit 60 may detect the reflection coefficient of antenna resonating element 10, an object in the vicinity of antenna resonating element 10, the reception level of antenna resonating element 10, and the selection of a communication mode using antenna resonating element 10. This allows the frequency characteristics of antenna resonating element 10 to be flexibly controlled in accordance with various states of antenna device 1.

[0117] 1 and other figures, antenna resonating element 10 may be a slot antenna, which allows for flexible control of the frequency characteristics of the slot antenna.

[0118] As described with reference to Fig. 9 and other figures, antenna device 1 may further include antenna length switching circuit 50 that switches the electrical length of antenna resonating element 10. This allows the electrical length of antenna resonating element 10 to be switched as well, thereby enabling more flexible control of the frequency characteristics of antenna resonating element 10. This effect becomes more pronounced when a hybrid configuration is used that combines control (fine adjustment) of the frequency characteristics of antenna resonating element 10 by moving power feeding point 13a and control (large adjustment) of the frequency characteristics of antenna resonating element 10 by antenna length switching circuit 50.

[0119] 10 etc., antenna length switching circuit 501 may be a variable impedance circuit. In this case, the electrical length of antenna resonating element 10 can be changed by changing the impedance of antenna length switching circuit 501.

[0120] As described with reference to FIG. 11 etc., antenna length switching circuit 502 may include contact terminals 522 to 524 and switches 562 to 564 and 582 to 584. Contact terminals 522 to 524 come into contact with antenna resonating element 10 at different positions. Switches 562 to 564 and 582 to 584 select, from contact terminals 522 to 524, a contact terminal at which the impedance of antenna length switching circuit 501 (e.g., reactance 572) appears. In this manner, the impedance of antenna length switching circuit 501 can be changed, and the electrical length of antenna resonating element 10 can be changed.

[0121] Antenna device 1 may be incorporated into an imaging device. Such an imaging device is also one aspect of the present disclosure. The imaging device may have any of the configurations of antenna device 1 described above. Antenna resonating element 10 may be provided in the housing of the imaging device, and antenna feed circuit board 20 may be provided within the housing. For example, in this manner, antenna device 1 can be incorporated into an imaging device, thereby providing an imaging device that can flexibly control the frequency characteristics of antenna resonating element 10.

[0122] 18 and 19 is also one aspect of the present disclosure. That is, the control method includes continuously moving feed point 13a on antenna resonating element 10 (steps S14, S15, S24, and S25). This control method also allows for flexible control of the frequency characteristics of antenna resonating element 10, similar to antenna device 1.

[0123] The effects described in this disclosure are merely examples and are not limited to the disclosed contents. Other effects may also be obtained.

[0124] 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 within the scope of the gist of the present disclosure. Furthermore, components of different embodiments and modifications may be combined as appropriate.

[0125] Furthermore, the effects of each embodiment described in this specification are merely examples and are not intended to be limiting, and other effects may also be obtained.

[0126] The present technology can also be configured as follows. (1) an antenna resonating element; an antenna feeder circuit board for supplying power to the antenna resonating element; a power supply point moving mechanism that continuously moves a power supply point to the antenna resonating element on the antenna resonating element; Equipped with Antenna device. (2) the power feed point moving mechanism moves the power feed point by adjusting a positional relationship between the antenna resonating element and the antenna feed circuit board. The antenna device described in (1). (3) the power feed point moving mechanism moves the antenna feed circuit board to move the power feed point; The antenna device described in (2). (4) a contact portion provided between the antenna resonating element and the antenna feeder circuit board, the contact portion being in contact with the antenna resonating element and being integral with the antenna feeder circuit board; The contact point between the antenna resonating element and the contact portion is the power supply point. The antenna device according to any one of (1) to (3). (5) the feed point moving mechanism moves the antenna feed circuit board in a direction perpendicular to a plane defined by the antenna resonating element; the contact portion elastically deforms so that a contact point with the antenna resonating element moves in response to a change in the distance between the antenna resonating element and the antenna feeder circuit board. The antenna device according to (4). (6) the contact portion has a configuration in which an angle of inclination with respect to a plane defined by the antenna feeder circuit board can be changed, The angle of the inclination changes in response to a change in the distance. (5) An antenna device according to the present invention. (7) the contact portion includes a first portion fixed to the antenna feeder circuit board and a second portion extending from a connection point with the first portion at an angle with respect to the vertical direction, the inclination angle is an inclination angle of the second portion with respect to a plane formed by the antenna feed circuit board. (6) An antenna device according to the present invention. (8) the contact portion includes a base portion connected to the antenna feeder circuit board, and a rotating portion that contacts the antenna resonating element at the feed point and has a structure that is rotatable relative to the base portion. The antenna device according to (4). (9) the contact portion rotates from the antenna feeder circuit board side as a starting point toward the antenna resonating element so that a contact point with the antenna resonating element moves; The antenna device according to (4). (10) the contact portion is selected from a plurality of portions that contact the antenna resonating element at different locations. The antenna device according to any one of (4) to (9). (11) the antenna feeder circuit board has a metal pattern that is contactlessly coupled to a metal portion that constitutes the antenna resonating element, The position of the non-contact coupling is the power supply point. The antenna device according to any one of (1) to (3). (12) a detection circuit for detecting a state of the antenna device; a control unit that controls the power feeding point moving mechanism based on a detection result of the detection circuit; Further provided with The antenna device according to any one of (1) to (11). (13) the detection circuit detects at least one of a reflection coefficient of the antenna resonating element, an object in proximity to the antenna resonating element, a reception level of the antenna resonating element, and a selection of a communication mode using the antenna resonating element. The antenna device according to (12). (14) the antenna resonating element is a slot antenna; The antenna device according to any one of (1) to (13). (15) further comprising an antenna length switching circuit that switches the electrical length of the antenna resonating element; The antenna device according to any one of (1) to (14). (16) the antenna length switching circuit is a variable impedance circuit; The antenna device according to (15). (17) The antenna length switching circuit a plurality of contact terminals that contact the antenna resonating element at different positions; a switch for selecting a contact terminal from the plurality of contact terminals at which the impedance of the antenna length switching circuit appears; Including, An antenna device according to (15) or (16). (18) An imaging element; an antenna resonating element; an antenna feeder circuit board for supplying power to the antenna resonating element; a power supply point moving mechanism that continuously moves a power supply point to the antenna resonating element on the antenna resonating element; Equipped with Imaging device. (19) the antenna resonating element is configured using a part of a housing of the imaging device, the antenna feeder circuit board is provided inside the housing; The imaging device according to (18). (20) a power supply point from an antenna feed circuit board to an antenna resonating element being continuously moved on the antenna resonating element; A method for controlling an antenna device. [Explanation of symbols]

[0127] 1 Antenna device 10 Antenna resonating element 11 Main plate 12 slots 13 Power supply area 13a Power supply point 20 Antenna power supply circuit board 21 PCB 30 Power supply point moving mechanism 31 Transformation mechanism 32 Spring 33 Conveyor Belt 34 Linear motor mechanism 40 Contact area 41 Spring 42 Rotation mechanism 43 Spring 50 Antenna length switching circuit 51 PCB 52 Contact terminal 60 Detection circuit 61 Feedback Circuit 62 Proximity sensor circuit 63 Receiving level detection circuit 64 Mode selection circuit 70 Control Unit

Claims

1. an antenna resonating element; an antenna feeder circuit board for supplying power to the antenna resonating element; a power supply point moving mechanism that continuously moves a power supply point to the antenna resonating element on the antenna resonating element; Equipped with the power feed point moving mechanism moves the power feed point by adjusting a positional relationship between the antenna resonating element and the antenna feed circuit board. Antenna device.

2. the power feed point moving mechanism moves the antenna feed circuit board to move the power feed point; The antenna device according to claim 1 .

3. a contact portion provided between the antenna resonating element and the antenna feeder circuit board, the contact portion being in contact with the antenna resonating element and being integral with the antenna feeder circuit board; The contact point between the antenna resonating element and the contact portion is the power supply point. The antenna device according to claim 1 .

4. the feed point moving mechanism moves the antenna feed circuit board in a direction perpendicular to a plane defined by the antenna resonating element; the contact portion elastically deforms so that a contact point with the antenna resonating element moves in response to a change in the distance between the antenna resonating element and the antenna feeder circuit board. The antenna device according to claim 3 .

5. the contact portion has a configuration in which an angle of inclination with respect to a plane defined by the antenna feeder circuit board can be changed, The angle of the inclination changes in response to a change in the distance.

5. The antenna device according to claim 4.

6. the contact portion includes a first portion fixed to the antenna feeder circuit board and a second portion extending from a connection point with the first portion at an angle with respect to the vertical direction, the inclination angle is an inclination angle of the second portion with respect to a plane defined by the antenna feed circuit board; 6. The antenna device according to claim 5.

7. the contact portion includes a base portion connected to the antenna feeder circuit board, and a rotating portion that contacts the antenna resonating element at the feed point and has a structure that is rotatable relative to the base portion. The antenna device according to claim 3 .

8. the contact portion rotates from the antenna feeder circuit board side as a starting point toward the antenna resonating element so that a contact point with the antenna resonating element moves; The antenna device according to claim 3 .

9. the contact portion is selected from a plurality of portions that contact the antenna resonating element at different locations. The antenna device according to claim 3 .

10. the antenna feeder circuit board has a metal pattern that is contactlessly coupled to a metal portion that constitutes the antenna resonating element, The position of the non-contact coupling is the power supply point. The antenna device according to claim 1 .

11. a detection circuit for detecting a state of the antenna device; a control unit that controls the power feeding point moving mechanism based on a detection result of the detection circuit; Further provided with The antenna device according to claim 1 .

12. the detection circuit detects at least one of a reflection coefficient of the antenna resonating element, an object in proximity to the antenna resonating element, a reception level of the antenna resonating element, and a selection of a communication mode using the antenna resonating element. The antenna device according to claim 11.

13. the antenna resonating element is a slot antenna; The antenna device according to claim 1 .

14. further comprising an antenna length switching circuit that switches the electrical length of the antenna resonating element; The antenna device according to claim 1 .

15. the antenna length switching circuit is a variable impedance circuit; 15. The antenna device according to claim 14.

16. The antenna length switching circuit a plurality of contact terminals that contact the antenna resonating element at different positions; a switch for selecting a contact terminal from the plurality of contact terminals to be connected to a reactance element of the antenna length switching circuit; Including, 15. The antenna device according to claim 14.

17. An imaging element; an antenna resonating element; an antenna feeder circuit board for supplying power to the antenna resonating element; a power supply point moving mechanism that continuously moves a power supply point to the antenna resonating element on the antenna resonating element; Equipped with Imaging device.

18. the antenna resonating element is configured using a part of a housing of the imaging device, the antenna feeder circuit board is provided inside the housing; The imaging device according to claim 17.

19. a power feeding point from an antenna feed circuit board to an antenna resonating element is continuously moved on the antenna resonating element; the moving includes moving the feeding point by adjusting a positional relationship between the antenna resonating element and the antenna feeder circuit board. A method for controlling an antenna device.

Images