Transceiver

Abstract

A transmission / reception device comprises a pair of substrates (10, 20) which are coaxially disposed, which respectively have, on annular surfaces (10a, 20a) facing each other, a plurality of transmission antennas (11) and a plurality of reception antennas (21) that transmit and receive signals and that are concentrically arranged, and which are supported in such a manner as to be relatively rotatable about the center axis (O) of the surfaces (10a, 20). The polarization direction (P) of the reception antennas (21) and the polarization direction (P) of the transmission antennas (11) at the frequency of the signals match.

Description

Technical Field

[0001] The present disclosure relates to a transceiver device.

Background Art

[0002] Patent Document 1 discloses a transceiver device that transmits and receives high-frequency signals between a microstrip line on the rotating part side and a microstrip line on the fixed part side.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the transceiver device disclosed in Patent Document 1, when a high-frequency signal propagates from the microstrip line on the rotating part side to the microstrip line on the fixed part side, depending on the rotation angle of the terminating resistance in the microstrip line on the rotating part side with respect to the microstrip line on the fixed part side, there is a possibility that the high-frequency signal cannot be transmitted and received. That is, the transceiver device disclosed in Patent Document 1 has a problem that it cannot transmit and receive high-frequency signals at a specific rotation angle in the rotating part.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a transceiver device that can transmit and receive signals at any rotation angle.

Means for Solving the Problems

[0006] The transmitting and receiving device according to this disclosure comprises a pair of substrates arranged coaxially and having a plurality of transmitting antennas and a plurality of receiving antennas arranged concentrically on mutually opposing annular surfaces, and supported so as to be rotatable relative to each other with respect to the central axis of the opposing surfaces, wherein the polarization direction of the transmitting antenna and the polarization direction of the receiving antenna coincide at the signal frequency. [Effects of the Invention]

[0007] According to this disclosure, signals can be transmitted and received regardless of the rotation angle. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of the external appearance of the transceiver according to Embodiment 1. [Figure 2] Figure 2A shows the transmitting circuit board viewed from the opposite side. Figure 2B shows the receiving circuit board viewed from the opposite side. [Figure 3] This figure shows the signal processing circuit of the transmitting and receiving device according to Embodiment 1. [Figure 4] This is an enlarged view of the main part of the surface of the transmitting side substrate according to Embodiment 1. [Figure 5] This is an enlarged view of the main part of the surface of the transmitting side substrate according to Embodiment 2. [Figure 6] This is an enlarged view of the main part of the surface of the transmitting side substrate according to Embodiment 3. [Figure 7] This is an enlarged view of the main part of the surface of the transmitting side substrate according to Embodiment 4. [Figure 8] This is an enlarged view of the main part of the surface of the transmitting side substrate according to Embodiment 5. [Figure 9] This is a cross-sectional view taken along the line IX-IX in Figure 8. [Figure 10] This is an enlarged view of the main part of the surface of the transmitting side substrate according to Embodiment 6. [Figure 11] This is a cross-sectional view taken along the line XI-XI in Figure 10. [Figure 12] This is an enlarged view of the main part of the surface of the transmitting side substrate according to Embodiment 7. [Modes for carrying out the invention]

[0009] To provide a more detailed explanation of this disclosure, the forms for implementing this disclosure will be described below with reference to the attached drawings.

[0010] Embodiment 1. The transmitting and receiving device according to Embodiment 1 will be described with reference to Figures 1 to 4.

[0011] Figure 1 is an external perspective view of a transceiver according to Embodiment 1. As shown in Figure 1, the transceiver according to Embodiment 1 comprises a pair of transmitting substrates 10 (hereinafter simply referred to as substrate 10) and receiving substrates 20 (hereinafter simply referred to as substrate 20). The substrates 10 and 20 are formed in annular shape and are arranged coaxially. The central axis of substrate 10 and the central axis of substrate 20 coincide on the central axis O. Furthermore, the substrates 10 and 20 are arranged with a predetermined gap in the direction of the central axis. That is, the substrates 10 and 20 are arranged in a non-contact manner and facing each other in the direction of the central axis.

[0012] The transmitting and receiving device according to Embodiment 1 supports the substrates 10 and 20 so that they can rotate relative to each other with respect to the central axis O. When the transmitting and receiving device according to Embodiment 1 supports the substrates 10 and 20 so that they can rotate relative to each other, there are cases where the rotating substrate 10 is rotatable relative to the fixed substrate 20, where the rotating substrate 20 is rotatable relative to the fixed substrate 10, and where both substrates 10 and 20 are on the rotating side. In this case, the rotation of the substrates 10 and 20 can be in either direction, such as rotation to one side (e.g., forward rotation) or rotation to the other side (e.g., reverse rotation). Furthermore, when both substrates 10 and 20 are on the rotating side, their respective rotation directions are opposite to each other.

[0013] FIG. 2 is a view of substrates 10 and 20 as seen from the surface 10a and 20a sides. As shown in FIG. 2A, substrate 10 has a surface 10a and a back surface 10b. The surface 10a and the back surface 10b are formed in an annular shape. The surface 10a is a mounting surface for attaching a plurality of transmission antennas 11 to the substrate 10. The back surface 10b is a surface located on the opposite side of the surface 10a in the thickness direction or the central axis direction of the substrate 10. As shown in FIG. 2B, substrate 20 has a surface 20a and a back surface 20b. The surface 20a and the back surface 20b are formed in an annular shape. The surface 20a is a mounting surface for attaching a plurality of reception antennas 21 to the substrate 20. The back surface 20b is a surface located on the opposite side of the surface 20a in the thickness direction or the central axis direction of the substrate 20.

[0014] The transmission antenna 11 and the reception antenna 21 transmit and receive signals between them. The signal emitted from the transmission antenna 11 is received by the reception antenna 21. The transmission antenna 11 and the reception antenna 21 are, for example, patch antennas. Also, the signal is, for example, a high-frequency signal.

[0015] As shown in FIGS. 1 and 2, the surfaces 10a and 20a face each other in the central axis direction and are coaxially arranged. Also, the plurality of transmission antennas 11 and the plurality of transmission antennas 12 are arranged concentrically about the central axis O and have a predetermined gap amount in the central axis direction. That is, the surfaces 10a and 20a are opposing surfaces that face each other in the central axis direction.

[0016] FIG. 3 is a diagram showing a signal processing circuit of the transmission / reception apparatus according to Embodiment 1. The direction of the arrow shown in FIG. 3 indicates the signal flow. As shown in FIG. 3, the substrate 10 has a plurality of vias 15 and a distribution circuit 16. The vias 15 are provided one by one for each transmission antenna 11. The vias 15 are provided so as to penetrate the substrate 10 in its thickness direction. For this reason, one end of the via 15 penetrates the front surface 10a of the substrate 10 and is electrically connected to the transmission antenna 11. On the other hand, the other end of the via 15 penetrates the back surface 10b of the substrate 10. The distribution circuit 16 is a signal processing circuit that distributes the signal supplied from outside the apparatus to all the transmission antennas 11 with the same phase and the same amplitude. The distribution circuit 16 is electrically connected to the other end of each via 15.

[0017] Also, as shown in FIG. 3, the substrate 20 has a plurality of vias 25 and a combining circuit 26. The vias 25 are provided one by one for each reception antenna 21. The vias 25 are provided so as to penetrate the substrate 20 in its thickness direction. For this reason, one end of the via 25 penetrates the front surface 20a of the substrate 20 and is electrically connected to the reception antenna 21. On the other hand, the other end of the via 25 penetrates the back surface 20b of the substrate 20. The combining circuit 26 is a signal processing circuit that combines the signals supplied from all the vias 25 with the same phase and the same amplitude. The combining circuit 26 is electrically connected to the other end of each via 25.

[0018] Therefore, the transmission / reception apparatus according to Embodiment 1 can receive the signal emitted from the transmission antenna 11 by the reception antenna 21 in a state where the substrates 10 and 20 are relatively rotated about the central axis O as the rotation center. That is, the transmission / reception apparatus according to Embodiment 1 can transmit a signal in a non-contact manner and at high speed between the relatively rotating substrates 10 and 20.

[0019] Next, the shape and arrangement of the transmitting antenna 11 and the receiving antenna 21 will be explained using Figure 4. Figure 4 is an enlarged view of the main part of the surface 10a of the substrate 10. Note that the shape and arrangement of the transmitting antenna 11 on the surface 10a of the substrate 10 and the shape and arrangement of the receiving antenna 21 on the surface 20a of the substrate 20 are the same. Therefore, in Figure 4, the shape and arrangement of the transmitting antenna 11 are shown as representative. Also, in Figure 4, one wavelength of the signal applied to the transmitting antenna 11 is indicated by λ.

[0020] As shown in Figure 4, multiple transmitting antennas 11 are provided on the surface 10a of the substrate 10 along its circumferential direction. One transmitting antenna 11 is, for example, rectangular. Note that the term "rectangle" includes sectors that are close in shape to this rectangle. The rectangular transmitting antenna 11 is formed with a side length equal to half the wavelength of the signal (λ / 2 length). The transmitting antenna 11 has two sets of pairs of sides facing each other. In one set, the two opposing sides extend in the radial direction of the substrate 10 (hereinafter simply referred to as the radial direction), and in the other set, the two opposing sides extend in the circumferential direction of the substrate 10 (hereinafter simply referred to as the circumferential direction). In this case, the transmitting antenna 11 is excited in the length direction of half the wavelength of the signal (λ / 2 length direction). In this case, the transmitting antenna 11 is excited in both the radial and circumferential directions.

[0021] Furthermore, the spacing between adjacent transmitting antennas 11 in the circumferential direction of the substrate 10 is less than or equal to one wavelength (λ) of the signal. In this way, by setting the spacing between the transmitting antennas 11 to less than or equal to one wavelength of the signal, at least a portion of the transmitting antennas 11 will always face one of the receiving antennas 21 in the direction of the central axis, even if the substrates 10 and 20 rotate relative to each other. As a result, the transmitting antennas 11 can prevent a decrease in the signal transmission characteristics.

[0022] Furthermore, in the transmitting antenna 11, the direction in which its polarization plane extends (hereinafter referred to as the polarization direction P) is set based on the position of conductivity with one end of the via 15, which is the feed point of the transmitting antenna 11. That is, the polarization direction P of the transmitting antenna 11 and the polarization direction P of the transmitting antenna 12 coincide at the frequency of the applied signal. The polarization plane is a plane that includes the direction in which the electric field oscillates. In this way, once the polarization plane is set, the electric field oscillates within that polarization plane, and the magnetic field oscillates in a direction perpendicular to the electric field.

[0023] For example, if the transmitting antenna 11 is rectangular, the impedance between the transmission antenna 11 and the feed line (not shown), which is electrically connected to the via 15, can be adjusted by shifting the position of the via 15 radially from the center of the transmitting antenna 11. Figure 4 shows an example in which the impedance of the feed line and the impedance of the transmitting antenna 11 are matched by shifting the position of the via 15 radially when an electromagnetic field with polarization direction P is generated in the radial direction of the substrate 10. As a result, when a high-frequency signal of the same phase and amplitude is fed to the transmitting antenna 11, an electromagnetic field with polarization direction P in the radial direction is uniformly formed in the circumferential direction of the substrate 10. That is, a uniform electromagnetic field distribution is formed in the circumferential direction of the substrate 10. Therefore, the transmitting and receiving device according to Embodiment 1 can stably transmit and receive signals regardless of the rotation angle.

[0024] As described above, the transmitting and receiving device according to Embodiment 1 can transmit and receive signals between the substrates 10 and 20 regardless of the rotation angle of the substrates 10 and 20.

[0025] Embodiment 2. The transmitting and receiving device according to Embodiment 2 will be described with reference to Figure 5. Figure 5 is an enlarged view of the main part on the surface 10a of the substrate 10. The shape and arrangement of the transmitting antenna 12 on the surface 10a of the substrate 10 and the shape and arrangement of the receiving antenna on the surface 20a of the substrate 20 are the same. Therefore, in Figure 5, the shape and arrangement of the transmitting antenna 12 are shown as representative. In Figure 5, one wavelength of the signal applied to the transmitting antenna 12 is indicated by λ. Furthermore, components having the same function as those described in Embodiment 1 above are denoted by the same reference numerals, and their descriptions are omitted.

[0026] The substrate 10 according to Embodiment 2 has a transmitting antenna 12 instead of the transmitting antenna 11 of the substrate 10 according to Embodiment 1.

[0027] As shown in Figure 5, multiple transmitting antennas 12 are provided on the surface 10a of the substrate 10 along its circumferential direction. One transmitting antenna 12 is, for example, a rectangle whose longitudinal direction is aligned with the circumferential direction. Therefore, the transmitting antenna 12 has two sets of pairs of sides facing each other. The two opposing sides of one set extend radially and are formed to a length of half a wavelength of the signal (a length of λ / 2). The two opposing sides of the other set extend circumferentially and are formed to a length from half a wavelength to three-quarters of the signal (a length from λ / 2 to 3λ / 4). In this case, the transmitting antenna 11 is excited in the longitudinal direction of half a wavelength of the signal (a length of λ / 2). In this case, the transmitting antenna 12 is excited in the radial direction.

[0028] Furthermore, the spacing between adjacent transmitting antennas 11 in the circumferential direction of the substrate 10 is a length from one wavelength to 3 / 2 wavelength of the signal (a length from λ to 3λ / 2). If the two opposing sides of the other pair are set to a length of 1 / 2 wavelength of the signal, the spacing becomes less than or equal to one wavelength of the signal. Also, if the two opposing sides of the other pair are set to a length of 3 / 4 wavelength of the signal, the spacing becomes less than or equal to 3 / 2 wavelength of the signal.

[0029] Thus, even when the installation interval of the transmitting antennas 12 is set to a length from one wavelength to 3 / 2 wavelength of the signal, at least a portion of the transmitting antennas 12 will always face one of the receiving antennas in the central axis direction, even if the substrates 10 and 20 rotate relative to each other. For this reason, the transmitting and receiving device according to Embodiment 2 can reduce the number of transmitting antennas 12 installed by increasing the installation interval. Furthermore, the transmitting and receiving device according to Embodiment 2 can miniaturize the distribution circuit 16 and the combining circuit 26 by reducing the number of transmitting antennas 12 installed.

[0030] Furthermore, the polarization direction P in the transmitting antenna 12 is set based on the connection position with one end of the via 15 in the transmitting antenna 12. The polarization plane is a plane that includes the direction in which the electric field oscillates. In this way, once the polarization plane is set, the electric field oscillates within that polarization plane, and the magnetic field oscillates in a direction perpendicular to the electric field.

[0031] For example, if the transmitting antenna 12 is rectangular, the impedance between the transmission antenna 12 and the feed line electrically connected to the via 15 can be adjusted by shifting the position of the via 15 radially from the center of the transmitting antenna 12. Figure 5 shows an example in which the impedance of the feed line and the impedance of the transmitting antenna 12 are matched by shifting the position of the via 15 radially when an electromagnetic field with polarization direction P is generated in the radial direction of the substrate 10. As a result, when a high-frequency signal of the same phase and amplitude is fed to the transmitting antenna 12, an electromagnetic field with polarization direction P in the radial direction is uniformly formed in the circumferential direction of the substrate 10. That is, a uniform electromagnetic field distribution is formed in the circumferential direction of the substrate 10. Therefore, the transmitting and receiving device according to Embodiment 3 can stably transmit and receive signals regardless of the rotation angle.

[0032] As described above, in the transmitting and receiving device according to Embodiment 2, even if the installation interval of the transmitting antennas 12 is increased, an electromagnetic field having a polarization direction P in the radial direction is uniformly formed in the circumferential direction. Furthermore, in the transmitting and receiving device according to Embodiment 2, the number of antennas can be reduced by increasing the installation interval of the transmitting antennas 12.

[0033] Embodiment 3. The transmitting and receiving device according to Embodiment 3 will be described with reference to Figure 6. Figure 6 is an enlarged view of the main part on the surface 10a of the substrate 10. The shape and arrangement of the transmitting antenna 13 on the surface 10a of the substrate 10 and the shape and arrangement of the receiving antenna on the surface 20a of the substrate 20 are the same. Therefore, in Figure 6, the shape and arrangement of the transmitting antenna 13 are shown as representative. In Figure 6, one wavelength of the signal applied to the transmitting antenna 13 is indicated by λ. Furthermore, components having the same function as those described in Embodiment 1 above are denoted by the same reference numerals, and their descriptions are omitted.

[0034] The substrate 10 according to Embodiment 3 has a transmitting antenna 13 instead of the transmitting antenna 11 of the substrate 10 according to Embodiment 1.

[0035] As shown in Figure 6, multiple transmitting antennas 13 are provided on the surface 10a of the substrate 10 along its circumferential direction. One transmitting antenna 13 is, for example, a rectangle whose longitudinal direction is aligned with the circumferential direction. Therefore, the transmitting antenna 13 has two sets of pairs of sides facing each other. The two opposing sides of one set extend radially and are formed with a length of less than half a wavelength of the signal (less than λ / 2). The two opposing sides of the other set extend circumferentially and are formed with a length of half a wavelength of the signal (λ / 2). In this case, the transmitting antenna 13 is excited in the longitudinal direction of half a wavelength of the signal (λ / 2). In this case, the transmitting antenna 13 is excited in the circumferential direction.

[0036] In this way, the width of the transmitting antenna 13 can be reduced by forming the two radially extending sides with a length of less than half a wavelength of the signal wavelength. Therefore, the transmitting and receiving device according to Embodiment 3 can reduce the outer diameter of the substrates 10 and 20, and thus the device can be miniaturized.

[0037] Furthermore, the spacing between adjacent transmitting antennas 11 in the circumferential direction of the substrate 10 is less than or equal to one wavelength (λ) of the signal. In this way, by setting the spacing between the transmitting antennas 13 to less than or equal to one wavelength of the signal, at least a portion of the transmitting antenna 13 always faces one of the receiving antennas 21 in the direction of the central axis, even if the substrates 10 and 20 rotate relatively. As a result, the transmitting antenna 11 can prevent a decrease in the signal transmission characteristics.

[0038] Furthermore, the polarization direction P of the transmitting antenna 13 is set based on the connection position with one end of the via 15 in the transmitting antenna 13. The polarization plane is a plane that includes the direction in which the electric field oscillates. In this way, once the polarization plane is set, the electric field oscillates within that polarization plane, and the magnetic field oscillates in a direction perpendicular to the electric field.

[0039] For example, if the transmitting antenna 13 is rectangular, the impedance between the feed line electrically connected to the via 15 and the transmitting antenna 13 can be adjusted by shifting the position of the via 15 circumferentially from the center of the transmitting antenna 13. Figure 6 shows an example in which the impedance of the feed line and the impedance of the transmitting antenna 13 are matched by shifting the position of the via 15 circumferentially when an electromagnetic field with polarization direction P is generated in the circumferential direction of the substrate 10. As a result, when a high-frequency signal of the same phase and amplitude is fed to the transmitting antenna 13, an electromagnetic field with polarization direction P in the circumferential direction is uniformly formed in the substrate 10. That is, a uniform electromagnetic field distribution is formed in the circumferential direction on the substrate 10. Therefore, the transmitting and receiving device according to Embodiment 3 can stably transmit and receive signals regardless of the rotation angle.

[0040] As described above, the transmitting and receiving device according to Embodiment 3 allows for a reduction in the outer diameter of the substrates 10 and 20, thereby enabling miniaturization of the device.

[0041] Embodiment 4. The transmitting and receiving device according to Embodiment 4 will be described with reference to Figure 7. Figure 7 is an enlarged view of the main part of the surface 10a of the substrate 10 according to Embodiment 4. Components that have the same function as those described in Embodiment 1 above are denoted by the same reference numerals and their descriptions are omitted.

[0042] As shown in Figure 7, the transceiver according to Embodiment 4 is the transceiver according to Embodiment 1 with the addition of radio wave absorbing members 31 and 32. The transceiver according to Embodiment 4 only needs to be equipped with at least one of the radio wave absorbing members 31 and 32. Figure 7 shows an example of the transceiver according to Embodiment 4 equipped with both radio wave absorbing members 31 and 32.

[0043] The radio wave absorbing members 31 and 32 absorb electromagnetic noise associated with the transmission and reception of signals. The radio wave absorbing member 31 is formed in an annular shape and is provided over the entire inner circumference of the substrate 10. The radio wave absorbing member 32 is also formed in an annular shape and is provided over the entire outer circumference of the substrate 10.

[0044] Here, the radio wave absorbing member 31 only needs to be provided on at least a portion of the inner circumference edge of the substrate 10. The radio wave absorbing member 32 only needs to be provided on at least a portion of the outer circumference edge of the substrate 10. Similarly, although not shown in the figures, the radio wave absorbing members 31 and 32 are also provided on the inner and outer circumference edges of the substrate 20.

[0045] As described above, the transmitting and receiving device according to Embodiment 4 can suppress leakage of electromagnetic noise from the transmitting and receiving device by providing radio wave absorbing members 31 and 32 at the inner and outer edges of the substrates 10 and 20.

[0046] Embodiment 5. The transmitting and receiving device according to Embodiment 5 will be described with reference to Figures 8 and 9. Figure 8 is an enlarged view of the main part of the surface 10a of the substrate 10 according to Embodiment 5. Figure 9 is a cross-sectional view taken along the line IX-IX in Figure 8. Components having the same function as those described in Embodiment 1 above are denoted by the same reference numerals, and their descriptions are omitted.

[0047] As shown in Figures 8 and 9, the transmitting and receiving device according to Embodiment 5 is a transmitting and receiving device according to Embodiment 1 with the addition of an electromagnetic bandgap structure 40. The electromagnetic bandgap structure 40 suppresses the propagation of electromagnetic noise in the frequency band of the signals used for transmitting and receiving. The electromagnetic bandgap structure 40 is provided on the substrate 10 and is positioned radially inward from the transmitting antenna 11. Note that the electromagnetic bandgap structure 40 only needs to be provided on at least one of the radially inward or radially outward sides of the transmitting antenna 11. Similarly, although not shown in the figures, the electromagnetic bandgap structure 40 is also provided on the substrate 20.

[0048] The electromagnetic bandgap structure 40 includes, for example, electrodes 41, vias 42, and GND 43. The electrodes 41 are formed in a flat plate shape and are provided on the surface 10a of the substrate 10. These electrodes 41 are arranged in two rows along the circumferential direction of the substrate 10. Note that the number of electrodes 41 arranged can be one or more. The vias 42 are provided so as to penetrate the substrate 10 in its thickness direction. GND 43 is provided on the back surface 10b of the substrate 10. Each electrode 41 and GND 43 are electrically connected by one via 42. The transmitting antenna 11 is electrically connected to GND 43 via via 15.

[0049] The electromagnetic bandgap structure 40 can block electromagnetic waves of a specific frequency band by adjusting, for example, the size of the electrodes 41, the spacing between adjacent electrodes 41 in the circumferential direction, the spacing between adjacent electrodes 41 in the radial direction, and the diameter of the vias 42 and the axial length of the vias 42.

[0050] As described above, the transmitting and receiving device according to Embodiment 5 can suppress leakage of electromagnetic wave noise from the transmitting and receiving device by providing an electromagnetic bandgap structure 40 on the substrates 10 and 20.

[0051] Embodiment 6. The transmitting and receiving device according to Embodiment 6 will be described with reference to Figures 10 and 11. Figure 10 is an enlarged view of the main part of the surface 10a of the substrate 10 according to Embodiment 6. Figure 11 is a cross-sectional view taken along the line XI-XI in Figure 10. Components having the same function as those described in Embodiment 1 above are denoted by the same reference numerals, and their descriptions are omitted.

[0052] As shown in Figures 10 and 11, the transceiver according to Embodiment 6 is a transceiver according to Embodiment 1 with the addition of an electromagnetic bandgap structure 50. The electromagnetic bandgap structure 50 suppresses the propagation of electromagnetic noise in the frequency band of the signals used for transmission and reception. The electromagnetic bandgap structure 50 is provided on the substrate 10 and is positioned radially inward from the transmitting antenna 11. Note that the electromagnetic bandgap structure 50 only needs to be provided on at least one of the radially inward or radially outward sides of the transmitting antenna 11. Similarly, although not shown in the figures, the electromagnetic bandgap structure 50 is also provided on the substrate 20.

[0053] The electromagnetic bandgap structure 50 includes, for example, an electrode 51, a via 52, and a GND 53. The electrode 51 is formed in a flat plate shape and is provided on the surface 10a of the substrate 10. This electrode 51 is formed in an annular shape so as to follow the circumferential direction of the substrate 10. The via 52 penetrates the substrate 10 in its thickness direction. The GND 53 is provided on the back surface 10b of the substrate 10. Each electrode 51 and the GND 53 are electrically connected by one via 52. In this case, one end of the via 52 is connected to the outer peripheral end 51b of the electrode 51. Therefore, the inner peripheral end 51a of the electrode 51 is an open end and has a strong electric field. On the other hand, the outer peripheral end 51b of the electrode 51 is a short-circuit end and has zero electric field.

[0054] Furthermore, the other end of via 15 is electrically connected to the feed line 16a that constitutes the distribution circuit 16. At this time, the radial length between the radially innermost end (radially inner end) of the transmitting antenna 11 and the inner circumference end 51a of the electrode 51 is half the wavelength of the signal. Note that the radially innermost end of the transmitting antenna 11 is the side that extends in the circumferential direction of the transmitting antenna 11.

[0055] The electromagnetic bandgap structure 50 can block electromagnetic waves of a specific frequency band by adjusting, for example, the size of the electrode 51, such as its width or circumferential length, the diameter of the via 52, or the axial length of the via 52.

[0056] Thus, in the electromagnetic bandgap structure 50, the open end of the electrode 51 with a strong electric field is located at a distance of half a wavelength of the signal wavelength from the radially innermost end of the transmitting antenna 11, while the short-circuited end of the electrode 51 without an electric field is adjacent to the transmitting antenna 11. For this reason, the transmitting and receiving device according to Embodiment 6, by including the electromagnetic bandgap structure 50, can suppress leakage of electromagnetic noise from the transmitting and receiving device without interfering with the electrical coupling between the transmitting antenna 11 and the receiving antenna 21 with an electric field.

[0057] Embodiment 7. The transceiver according to Embodiment 7 will be described with reference to Figure 12. Figure 12 is an enlarged view of the main part of the surface 10a of the substrate 10 according to Embodiment 6. Components having the same function as those described in Embodiment 1 above are denoted by the same reference numerals and their descriptions are omitted.

[0058] The transmitting and receiving device according to Embodiment 1 is equipped with a transmitting antenna 11 having the same frequency for the corresponding signals, whereas the transmitting and receiving device according to Embodiment 7 is equipped with transmitting antennas 11 and 14 having different frequencies for the corresponding signals.

[0059] As shown in Figure 12, the transceiver according to Embodiment 7 is equipped with multiple transmitting antennas 11 and 14 on a single substrate 10. Each of the transmitting antennas 11 and 14 is formed in a rectangular shape. Transmitting antenna 11 is larger than transmitting antenna 14. Furthermore, the transmitting antennas 11 and 14 are arranged concentrically around a central axis O. In this case, transmitting antenna 14 is positioned radially inward from transmitting antenna 11.

[0060] The transmitting antenna 11 is formed with a side length equal to half the wavelength of the signal (λa / 2). The transmitting antenna 11 is excited in the direction of half the wavelength of the signal (λa / 2). In this case, the transmitting antenna 11 is excited in both the radial and circumferential directions. Furthermore, the spacing between adjacent transmitting antennas 11 in the circumferential direction of the substrate 10 is less than or equal to one wavelength of the signal (λa or less). In addition, the polarization direction Pa of the transmitting antenna 11 is set in the radial direction of the substrate 10 based on the conductivity position with one end of the via 15 in the transmitting antenna 11.

[0061] The transmitting antenna 14 is formed with a side length equal to half the wavelength of the signal (λb / 2). The transmitting antenna 11 is excited in the direction of half the wavelength of the signal (λb / 2). In this case, the transmitting antenna 14 is excited in both the radial and circumferential directions. Furthermore, the spacing between adjacent transmitting antennas 14 in the circumferential direction of the substrate 10 is less than or equal to one wavelength of the signal (λb or less). In addition, the polarization direction Pb of the transmitting antenna 14 is set in the radial direction of the substrate 10 based on the conductivity position with one end of the via 15 in the transmitting antenna 14.

[0062] In this case, the polarization direction Pa of the transmitting antenna 11, the polarization direction Pb of the transmitting antenna 14, and the polarization directions of each receiving antenna facing the transmitting antennas 11 and 14 are the same. In this case, each polarization direction is the same in the radial direction.

[0063] The frequency of the signal corresponding to transmitting antenna 14 is higher than the frequency of the signal corresponding to transmitting antenna 11. Here, the wavelength of the signal becomes shorter as the frequency decreases. Therefore, when comparing transmitting antennas 11 and 14, the installation interval that is less than one wavelength is shorter for transmitting antenna 11, which corresponds to a lower frequency, and longer for transmitting antenna 14, which corresponds to a higher frequency. Thus, when transmitting antennas 11 and 14 are arranged in concentric circles, the number of transmitting antennas 11 needs to be increased to compensate for the shorter installation interval, so they are placed radially outward from transmitting antenna 14, while the number of transmitting antennas 14 can be reduced to compensate for the longer installation interval, so they are placed radially inward from transmitting antenna 11.

[0064] In the transceiver according to Embodiment 7, one circuit board 10 is equipped with transmitting antennas 11 and 14 with different frequencies for corresponding signals, and one circuit board 20 is equipped with receiving antennas with different frequencies for corresponding signals.

[0065] As described above, the transmitting and receiving device according to Embodiment 7 is equipped with transmitting antennas 11 and 14 with different frequencies for the signals they correspond to, and is therefore capable of transmitting and receiving signals of different frequencies, i.e., two types of signals.

[0066] Within the scope of this disclosure, it is possible to freely combine the embodiments, modify any component in each embodiment, or omit any component in each embodiment. [Industrial applicability]

[0067] The transmitting and receiving device according to this disclosure can transmit and receive signals regardless of the rotation angle of the substrate by matching the polarization direction of the transmitting antenna with the polarization direction of the receiving antenna, and is suitable for use in transmitting and receiving devices and the like. [Explanation of Symbols]

[0068] 10 Transmitting board, 10a Front, 10b Back, 11,12,13,14 Transmitting antenna, 15 Via, 16 Distribution circuit, 16a Feed line, 20 Receiving board, 20a Front, 20b Back, 21 Receiving antenna, 25 Via, 26 Combining circuit, 31,32 Radio wave absorbing material, 40 Electromagnetic bandgap structure, 41 Electrode, 42 Via, 43 GND, 50 Electromagnetic bandgap configuration, 51 Electrode, 51a Inner edge, 51b Outer edge, 52 Via, 53 GND, O Central axis, P, Pa, Pb Polarization direction.

Claims

1. It comprises a pair of substrates arranged coaxially and having a plurality of transmitting antennas and a plurality of receiving antennas for transmitting and receiving signals concentrically on their opposing annular surfaces, and supported so as to be rotatable relative to each other with respect to the central axis of the opposing surfaces. The polarization direction of the transmitting antenna and the polarization direction of the receiving antenna at the signal frequency are coincide. A transmitting and receiving device characterized by the following features.

2. The polarization direction in the transmitting antenna and the receiving antenna coincides with the radial or circumferential direction in the pair of substrates. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

3. The polarization direction in the transmitting antenna and the receiving antenna is the radial direction of the pair of substrates. The radial length of the transmitting antenna and the receiving antenna is the length of half a wavelength of the signal. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

4. The circumferential spacing between the transmitting antenna and the receiving antenna is less than or equal to one wavelength of the signal. The transmitting and receiving device according to claim 3, characterized in that it is a transceiver.

5. The transmitting antenna and the receiving antenna are rectangular, with each side having a length equal to half the wavelength of the signal. The transmitting and receiving device according to claim 3 or 4.

6. The circumferential length of the transmitting antenna and the receiving antenna is between half a wavelength and three-quarters of a wavelength of the signal. The transmitting and receiving device according to claim 3, characterized in that it is a transceiver.

7. The circumferential spacing between the transmitting antenna and the receiving antenna is a length ranging from one wavelength to 3 / 2 wavelength of the signal. The transmitting and receiving device according to claim 6, characterized in that it is a transceiver.

8. The polarization direction in the transmitting antenna and the receiving antenna is the circumferential direction of the pair of substrates. The circumferential length of the transmitting antenna and the receiving antenna is the length of half a wavelength of the signal. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

9. The radial length of the transmitting antenna and the receiving antenna is less than half the wavelength of the signal. The transmitting and receiving device according to claim 8, characterized in that it is a transceiver.

10. The circumferential spacing between the transmitting antenna and the receiving antenna is less than or equal to one wavelength of the signal. The transmitting and receiving device according to claim 9.

11. The pair of substrates includes an electromagnetic wave absorbing member provided on at least one of the inner and outer edges. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

12. The transmitting antenna and the receiving antenna are provided with an electromagnetic bandgap structure located on at least one of the radially inner and radially outer sides. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

13. The aforementioned electromagnetic bandgap structure is An annular electrode provided on the opposing surface, A GND is provided on the surface located on the opposite side of the aforementioned opposing surface, It has a via connecting the electrode and the GND, The inner circumferential end of the electrode is an open end, and the outer circumferential end of the electrode is a short-circuit end connected to the via. The distance between the open end and the radially inner end of the transmitting antenna or the receiving antenna is the length of half a wavelength of the signal. The transmitting and receiving device according to claim 12, characterized in that it is a transceiver.

14. The plurality of transmitting antennas and the plurality of receiving antennas are each arranged in two rows along the circumferential direction. The frequency of the signals corresponding to the transmitting and receiving antennas in the radially inner row of two rows of transmitting and receiving antennas is greater than the frequency of the signals corresponding to the transmitting and receiving antennas in the radially outer row. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

15. The radial and circumferential lengths of the transmitting antenna and the receiving antenna are equal to the length of half a wavelength of the signal. The polarization direction of the transmitting antenna and the receiving antenna is determined by the conductivity position between the transmitting antenna and the feed point of the transmitting antenna and the receiving antenna. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

16. A distribution circuit is provided on the substrate on which the transmitting antennas are mounted, and distributes the signal to each transmitting antenna with the same phase and the same amplitude. The system includes a combining circuit provided on the substrate on which the receiving antennas are mounted, which combines the signals from each receiving antenna so that they have the same phase and the same amplitude. The transmitting and receiving device according to claim 1, characterized in that it is a transceiver.

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