Radio communication device
The wireless communication device addresses the issue of increased transmission losses in bent transmission lines by using a waveguide line with a movable second antenna and a design where the side perpendicular to the open surface is at least three wavelengths of the carrier frequency, achieving low-cost, low-loss, and high-speed communication.
Patent Information
- Application Number
- JP2023172150
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-10-03
- Publication Date
- 2025-04-15
AI Technical Summary
Existing wireless communication devices face challenges with increased transmission losses when transmission lines are rapidly bent, leading to incorrect data transmission, retransmission requirements, and difficulties in speeding up communication. Additionally, manufacturing bent lines for combination with metal housings and substrates is costly and difficult.
A wireless communication device is designed with a waveguide line having an open surface along the tube axis, a first terminal to absorb electromagnetic waves, a first antenna, and a second antenna that is movable along the tube axis. The device wirelessly transmits electromagnetic waves between the antennas, with the length of the side perpendicular to the open surface being at least three wavelengths of the carrier frequency, reducing transmission losses.
The solution enables low-cost wireless communication devices with minimal transmission losses, allowing for stable and high-speed communication, even when the waveguide line is bent, by maintaining constant electromagnetic wave intensity within the waveguide.
Smart Images
Figure 2025062844000001_ABST
Abstract
Description
[Technical field]
[0001] The present disclosure relates to wireless communication devices. [Background technology]
[0002] There is an increasing demand for wireless communication technology to make communication lines within equipment wireless. Wireless communication within equipment is expected to have the effect of saving space for communication parts and making wiring maintenance-free. For large equipment, long-distance transmission within the equipment and communication while sliding are expected.
[0003] Patent Document 1 discloses a line configuration that combines a substrate constituting the line with a metal housing that provides a reference potential, as a line configuration that reduces transmission loss even in long-distance transmission. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] JP 2001-230606 A Summary of the Invention [Problem to be solved by the invention]
[0005] In order to wirelessly communicate within a device, a flexible line design is required in order to arrange the transmission line in accordance with the internal structure of the device. However, in the case of a transmission line such as that in Patent Document 1, if the line is suddenly bent in a direction perpendicular to the extension direction, there is a problem that the transmission loss increases. This causes problems such as incorrect data transmission, requiring time for retransmission, and making it difficult to increase the communication speed. Furthermore, when manufacturing a bent line on a substrate to combine it with a metal case, there are also problems such as poor manufacturability and high costs.
[0006] An object of the present disclosure is to realize a wireless communication device with low transmission loss at low cost. [Means for solving the problem]
[0007] The wireless communication device has a waveguide-type line with one side along the tube axis direction being open, a first terminator that absorbs electromagnetic waves at one end of the waveguide-type line, a first antenna, and a second antenna that is movable along the tube axis direction of the waveguide-type line and communicates electromagnetic waves with the first antenna, wherein the waveguide-type line wirelessly transmits electromagnetic waves between the first antenna and the second antenna, and the length of the side perpendicular to the open side is equal to or longer than three wavelengths of the carrier frequency of the electromagnetic waves. Effect of the Invention
[0008] According to the present disclosure, a wireless communication device with low transmission loss can be realized at low cost. [Brief description of the drawings]
[0009] [Figure 1] FIG. 1 illustrates an example of the configuration of a wireless communication device. [Diagram 2] FIG. 13 is a diagram showing a simulation result. [Diagram 3] FIG. 13 is a diagram showing a simulation result. [Figure 4] FIG. 1 illustrates an example of the configuration of a wireless communication device. [Diagram 5] FIG. 13 is a diagram showing a simulation result. [Figure 6] FIG. 13 is a diagram showing a simulation result. [Figure 7] FIG. 1 illustrates an example of the configuration of a wireless communication device. [Figure 8] FIG. 13 is a diagram showing a simulation result. [Figure 9] FIG. 1 illustrates an example of the configuration of a wireless communication device. [Figure 10] FIG. 13 is a diagram showing a simulation result. [Figure 11] FIG. 13 is a diagram showing a simulation result. [Figure 12] FIG. 1 illustrates an example of the configuration of a wireless communication device. [Figure 13]FIG. 1 illustrates an example of the configuration of a wireless communication device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0010] (First embodiment) Hereinafter, an embodiment will be described with reference to the drawings.
[0011] 1 shows an example of the configuration of a wireless communication device 10 according to the first embodiment. The wireless communication device 10 includes a waveguide line 100, a transmitting antenna 110, a receiving antenna 120, and a terminator .
[0012] The waveguide line 100 has an open surface 101 along the tube axis direction. The waveguide line 100 is made of metal, and the manufacturing method thereof is not particularly limited. In this embodiment, the waveguide line 100 is a rectangular waveguide line having a rectangular cross-sectional structure, but it does not necessarily have to be rectangular.
[0013] Terminator 130 is disposed at one end of waveguide line 100 close to end 103 where transmitting antenna 110 is not disposed, and absorbs electromagnetic waves at one end of waveguide line 100. Terminator 130 absorbs electromagnetic waves like an absorber. Ends 102 and 103 of waveguide line 100 may be tapered for impedance matching.
[0014] The transmitting antenna 110 is disposed at the other end close to the other end 102 of the waveguide line 100. The receiving antenna 120 is disposed inside or near the outside of the open face 101 of the waveguide line 100, is movable along the axial direction of the waveguide line 100, and communicates electromagnetic waves with the transmitting antenna 110.
[0015] The waveguide line 100 wirelessly transmits electromagnetic waves between the transmitting antenna 110 and the receiving antenna 120. The height H of the waveguide line 100 is the length of the side perpendicular to the open surface 101. The width W of the waveguide line 100 is the length of the side horizontal to the open surface 101.
[0016] Next, a description will be given of the operation of the wireless communication device 10. The electromagnetic wave transmitted from the transmitting antenna 110 is transmitted through the waveguide-type line 100 and is absorbed by the terminator 130. By appropriately selecting the cross-sectional structure of the waveguide-type line 100, the electromagnetic wave input to the waveguide-type line 100 can be transmitted with little loss from end 102 to end 103 of the waveguide-type line 100.
[0017] At this time, the electromagnetic waves input to the waveguide line 100 form a transmission mode within the waveguide line 100, and the electromagnetic waves exist at a constant intensity within the waveguide line 100. Therefore, by arranging the receiving antenna 120 in the vicinity of the waveguide line 100, the receiving antenna 120 can receive the electromagnetic waves at a constant intensity regardless of the position in the tube axis direction of the waveguide line 100. This enables stable communication between the transmitting antenna 110 and the receiving antenna 120.
[0018] When using a waveguide-type line 100 with a cross-sectional structure in which no transmission mode exists within the waveguide-type line 100, the electromagnetic wave leaks out from the open surface 101 while being transmitted from end 102 to end 103 of the waveguide-type line 100. Then, the intensity of the electromagnetic wave within the waveguide-type line 100 is not constant, making it difficult to perform stable communication.
[0019] 2 is a diagram showing the results of a simulation of the transmission characteristics of an electromagnetic wave transmitted from end 102 to end 103 of waveguide line 100 when the width W and height H of the cross-sectional structure of waveguide line 100 are changed. In this case, the carrier frequency of the electromagnetic wave is 60 GHz, and the carrier wave is a millimeter wave. FIG. 2 shows that when height H is three or more wavelengths of the carrier frequency of the electromagnetic wave, transmission from end 102 to end 103 of waveguide line 100 is achieved with low loss.
[0020] In Fig. 2, when the height H is 15 mm or more, the transmission loss is low. When the carrier frequency f of the electromagnetic wave is 60 GHz, 15 mm corresponds to three wavelengths (3 x λ) of the carrier frequency f of the electromagnetic wave, as shown in the following formula. Therefore, it is preferable that the height H is a length of three or more wavelengths of the carrier frequency f of the electromagnetic wave.
[0021] 3×λ=3×(3×10 8 / f) =3×{3×10 8 / (60×10 9 )} =0.015[m] =15[mm]
[0022] Fig. 3 is a diagram showing the simulation results of the transmission characteristics from end 102 on the transmitting antenna 110 side of waveguide line 100 to receiving antenna 120. Fig. 3 shows the transmission characteristics when the width W is 2 mm and the height H is 25 mm, and when the width W is 3 mm and the height is 5 mm, and when the position of receiving antenna 120 is 20 mm, 50 mm, and 80 mm from end 102 of waveguide line 100, respectively.
[0023] As shown in Fig. 2, a waveguide line 100 having a width W of 2 mm and a height of 25 mm transmits electromagnetic waves with low loss from end 102 to end 103 of the waveguide line 100. Fig. 3 shows that the transmission characteristics are constant regardless of the distance from end 102 to receiving antenna 120.
[0024] On the other hand, in the case of a waveguide line 100 having a width W of 3 mm and a height H of 5 mm, as shown in Fig. 2, while electromagnetic waves are being transmitted, they leak out from an open surface 101 of the waveguide line 100. Therefore, it is difficult for the electromagnetic waves to reach from end 102 to end 103 of the waveguide line 100, and Fig. 3 shows that the transmission characteristic to the receiving antenna 120 also decreases according to the distance from end 102 to the receiving antenna 120.
[0025] As described above, by making the cross-sectional structure of the waveguide line 100 such that electromagnetic waves are less likely to leak from the open surface 101, electromagnetic waves are present at a constant intensity inside the waveguide line 100. The receiving antenna 120 can receive electromagnetic waves at the same intensity at any position along the tube axis of the waveguide line 100. This allows stable wireless communication to be achieved, enabling high-speed communication.
[0026] The waveguide line 100 can be manufactured by a simple method such as bending a metal plate or digging a groove, thereby realizing a wireless communication device 10 with low transmission loss at low cost.
[0027] In the above, an example has been described in which the antenna 110 is a transmitting antenna and the antenna 120 is a receiving antenna, but the antenna 110 may be a receiving antenna and the antenna 120 may be a transmitting antenna.
[0028] Second Embodiment Fig. 4 is a diagram showing a configuration example of a wireless communication device 20 according to a second embodiment. In the wireless communication device 20 in Fig. 4 described below, the configurations already described in the wireless communication device 10 shown in Fig. 1 are denoted by the same reference numerals and description thereof will be omitted.
[0029] The wireless communication device 20 shown in Fig. 4 includes a waveguide line 200, a transmitting antenna 110, one receiving antenna 120, and a terminator 130. Receiving antennas 120a and 120b shown in Fig. 2 show different positions of one receiving antenna 120 that can be moved within the waveguide line 200.
[0030] 1, the waveguide line 200 is provided with a bending point 204 and is bent 90 degrees horizontally to the open surface 101. At the bending point 204, the waveguide line 200 is bent 90 degrees while maintaining the cross-sectional structure of the waveguide line 200. Also, the waveguide line 200 has an open surface 101 along the tube axis direction that is open.
[0031] Next, the operation of the wireless communication device 20 will be described. In the first embodiment, it has been described that stable communication is possible by a cross-sectional structure in which a transmission mode exists in the waveguide-type line 100. When the waveguide-type line 200 is bent midway, it is possible to bend the electromagnetic wave along the waveguide-type line 200 by making the cross-sectional structure such that the transmission mode does not collapse even at the bending point 204.
[0032] As a result, by disposing the receiving antenna 120 near the waveguide line 200, the receiving antenna 120 can receive electromagnetic waves with a constant intensity regardless of the position of the receiving antenna 120 in the axial direction of the waveguide line 200. As a result, stable communication between the transmitting antenna 110 and the receiving antenna 120 is possible.
[0033] 5 is a diagram showing the results of a simulation of the transmission characteristics of an electromagnetic wave transmitted from end 102 to end 103 of waveguide line 200 when the width W and height H of the cross-sectional structure of waveguide line 200 are changed. In this case, the carrier frequency of the electromagnetic wave is 60 GHz. Fig. 5 shows that when height H is three or more wavelengths of the carrier frequency of the electromagnetic wave and width W is less than or equal to the wavelength of the carrier frequency of the electromagnetic wave, transmission from end 102 to end 103 of waveguide line 200 occurs with low loss.
[0034] In Fig. 5, when the height H is 15 mm or more and the width W is 5 mm or less, the transmission loss is low. When the carrier frequency f of the electromagnetic wave is 60 GHz, the height H of 15 mm corresponds to three wavelengths (3 x λ) of the carrier frequency f of the electromagnetic wave, as described above. Furthermore, the width W of 5 mm corresponds to the wavelength (λ) of the carrier frequency f of the electromagnetic wave, as shown in the following formula. Therefore, it is preferable that the height H of the waveguide line 200 is three or more wavelengths of the carrier frequency f of the electromagnetic wave, and the width W is less than or equal to the wavelength of the carrier frequency f of the electromagnetic wave.
[0035] λ=3×10 8 / f =3×10 8 / (60×10 9 ) =0.005[m] =5[mm]
[0036] Fig. 6 is a diagram showing the results of a simulation of the transmission characteristics from the end 102 of the waveguide line 200 on the transmitting antenna 110 side to the receiving antenna 120. Fig. 6 shows the cases where the receiving antenna 120 is disposed at the position indicated by receiving antenna 120a and the position indicated by receiving antenna 120b for the cases where the width W is 2 mm and the height H is 25 mm and the width W is 3 mm and the height H is 5 mm. Receiving antenna 120a indicates the position where the receiving antenna 120 is disposed on the transmitting antenna 110 side of the bending point 204. Receiving antenna 120b indicates the position where the receiving antenna 120 is disposed on the terminator 130 side of the bending point 204.
[0037] As shown in Fig. 5, a waveguide-type line 200 having a width W of 2 mm and a height H of 25 mm transmits electromagnetic waves with low loss from end 102 to end 103 of the waveguide-type line 200. Fig. 6 shows that good transmission characteristics are obtained at the positions of receiving antennas 120a and 120b before and after passing through bending point 204.
[0038] On the other hand, in the case of a waveguide line 200 having a width W of 3 mm and a height H of 5 mm, as shown in Fig. 5, the electromagnetic wave cannot bend completely at bending point 204 and leaks out from open surface 101 of waveguide line 200, making it difficult for the electromagnetic wave to reach end 102 to end 103 of waveguide line 200. For this reason, Fig. 6 shows that the passing characteristic to receiving antenna 120 is also significantly degraded at the position of receiving antenna 120b after passing bending point 204.
[0039] As described above, by making the cross-sectional structure of the waveguide line 200 such that electromagnetic waves are less likely to leak from the open surface 101 and are easily bent along the waveguide line 200, electromagnetic waves are present at a constant intensity within the waveguide line 200. The receiving antenna 120 can receive electromagnetic waves at the same intensity at any position along the tube axis of the waveguide line 200. This allows stable wireless communication to be achieved, enabling high-speed communication.
[0040] (Third embodiment) Fig. 7 shows a configuration example of a wireless communication device 30 according to a third embodiment. In the wireless communication device 30 in Fig. 7 described below, the configurations already described in the wireless communication device 20 shown in Fig. 4 are denoted by the same reference numerals and description thereof will be omitted.
[0041] The wireless communication device 30 shown in Fig. 7 has the same configuration as the wireless communication device 20 shown in Fig. 4. Receiving antennas 120a, 120b, 120c, and 120d shown in Fig. 7 indicate the positions of the movable receiving antenna 120.
[0042] Receiving antenna 120a indicates a position where receiving antenna 120 is located inside (below) open surface 101, closer to transmitting antenna 110 than bending point 204. Receiving antenna 120b indicates a position where receiving antenna 120 is located inside open surface 101, closer to terminator 130 than bending point 204. Receiving antenna 120c indicates a position where receiving antenna 120 is located outside (upper) open surface 101, closer to transmitting antenna 110 than bending point 204. Receiving antenna 120d indicates a position where receiving antenna 120 is located outside open surface 101, closer to terminator 130 than bending point 204.
[0043] Next, the operation of the wireless communication device 30 will be described. As described above, a cross-sectional structure in which a transmission mode exists within the waveguide-type line 200 enables stable communication even when the bent waveguide-type line 200 is used. At this time, the electromagnetic waves do not leak from the open surface 101, but exist strongly inside the open surface 101. Therefore, by arranging the receiving antenna 120 inside the open surface 101, it is possible to obtain a larger gain.
[0044] Fig. 8 is a diagram showing a simulation result of the transmission characteristics from the end 102 on the transmitting antenna 110 side of the waveguide line 200 to the receiving antenna 120. The transmission characteristics in Fig. 8 show the transmission characteristics at the positions of the receiving antenna 120a, the receiving antenna 120b, the receiving antenna 120c, and the receiving antenna 120d.
[0045] 8 shows that the positions of the receiving antennas 120a and 120b arranged inside the open surface 101 of the waveguide-type line 200 provide a larger gain than the positions of the receiving antennas 120c and 120d arranged outside. The receiving antenna 120 is preferably arranged inside the waveguide-type line 200.
[0046] As described above, by arranging the receiving antenna 120 inside the open surface 101 of the waveguide line 200, the gain becomes larger, enabling more stable communication.
[0047] (Fourth embodiment) Fig. 9 is a diagram showing a configuration example of a wireless communication device 40 according to a fourth embodiment. In the wireless communication device 40 in Fig. 9 described below, the configurations already described in the wireless communication device 20 shown above are denoted by the same reference numerals, and description thereof will be omitted.
[0048] 9 includes a waveguide-type line 400, a transmitting antenna 110, a receiving antenna 120, and a terminator 130. The waveguide-type line 400 is bent 180 degrees at a bending point 204 while maintaining its cross-sectional structure. The waveguide-type line 400 has an open surface 101 along the tube axis direction that is open. Receiving antennas 120a and 120b indicate different positions of the receiving antenna 120 that can be moved within the waveguide-type line 400.
[0049] Next, a description will be given of the operation of the wireless communication device 40. As described above, a cross-sectional structure in which a transmission mode exists in the waveguide-type line 400 enables stable communication even when a bent waveguide-type line 400 is used.
[0050] 10 is a diagram showing the simulation results of the transmission characteristics of an electromagnetic wave transmitted from end 102 to end 103 of waveguide line 400 when the width W and height H of the cross-sectional structure of waveguide line 400 are changed. In this case, the carrier frequency of the electromagnetic wave is 60 GHz.
[0051] FIG. 10 shows that when height H is four or more wavelengths of the carrier frequency of the electromagnetic wave and width W is half or less of the wavelength of the carrier frequency of the electromagnetic wave, transmission occurs with low loss from end 102 to end 103 of waveguide line 400.
[0052] In Fig. 10, when the height H is 20 mm or more and the width W is 2.5 mm or less, the transmission loss is low. When the carrier frequency f of the electromagnetic wave is 60 GHz, the height H of 20 mm corresponds to four wavelengths (4 × λ) of the carrier frequency f of the electromagnetic wave, as shown in the following formula.
[0053] 4×λ=4×(3×10 8 / f) =4×{3×10 8 / (60×10 9 )} =0.02[m] =20[mm]
[0054] Moreover, the width W of 2.5 mm corresponds to half the wavelength (λ / 2) of the carrier frequency f of the electromagnetic wave, as shown in the following formula: Therefore, it is preferable that the height H of the waveguide line 400 is equal to or longer than four wavelengths of the carrier frequency f of the electromagnetic wave, and the width W is equal to or shorter than half the wavelength of the carrier frequency f of the electromagnetic wave.
[0055] λ / 2=(3×10 8 / f) / 2 ={3×10 8 / (60×10 9 )} / 2 =0.0025[m] =2.5[mm]
[0056] Fig. 11 is a diagram showing the simulation results of the transmission characteristics from the end 102 on the transmitting antenna 110 side of the waveguide line 400 to the receiving antenna 120. Fig. 11 shows the transmission characteristics at the positions of the receiving antenna 120a and the receiving antenna 120b for a width W of 2 mm and a height of 25 mm, and for a width W of 3 mm and a height H of 5 mm.
[0057] Receiving antenna 120a indicates a position of receiving antenna 120 on the transmitting antenna 110 side of bending point 204. Receiving antenna 120b indicates a position of receiving antenna 120 on the terminator 130 side of bending point 204.
[0058] 10, the waveguide line 400 having a width W of 2 mm and a height H of 25 mm transmits electromagnetic waves with low loss from end 102 to end 103 of the waveguide line 400. At this time, FIG. 11 shows that good transmission characteristics are obtained at the positions of receiving antennas 120a and 120b before and after bending point 204.
[0059] On the other hand, in the case of a waveguide line 400 having a width W of 3 mm and a height H of 5 mm, as shown in Fig. 10, the electromagnetic waves cannot bend completely at bending point 204 and leak out from open surface 101 of waveguide line 400, making it difficult for the electromagnetic waves to reach end 102 to end 103 of waveguide line 400. For this reason, Fig. 11 shows that the transmission characteristics to receiving antenna 120 are also significantly degraded at the position of receiving antenna 120b after bending point 204.
[0060] As described above, by configuring the cross-sectional structure of waveguide line 400 so that electromagnetic waves are less likely to leak from open surface 101 and are easily bent along waveguide line 400, electromagnetic waves can be made to exist at a constant intensity within waveguide line 400. Receiving antenna 120 can receive electromagnetic waves at the same intensity at any position along the tube axis of waveguide line 400. This enables faster wireless communication and improved reliability.
[0061] Fifth embodiment Fig. 12 is a diagram showing a configuration example of a wireless communication device 50 according to a fifth embodiment. In the wireless communication device 50 in Fig. 12 described below, the configurations already described in the wireless communication device 20 shown above are denoted by the same reference numerals, and description thereof will be omitted.
[0062] The wireless communication device 50 shown in FIG. 12 includes a waveguide line 200, a transmitting antenna 501, a receiving antenna 120, and terminators 503 and 504.
[0063] The transmitting antenna 501 is disposed inside or near the outside of the open face 101 of the waveguide line 200 with respect to the waveguide line 200, and is movable along the axial direction of the waveguide line 200. The receiving antenna 120 and the transmitting antenna 501 are preferably disposed inside the waveguide line 200.
[0064] For example, the transmitting antenna 501 is disposed between the inflection point 204 and the edge 102. The receiving antenna 120 is disposed between the inflection point 204 and the edge 103.
[0065] Terminator 504 is disposed at one end of waveguide line 200 close to one end 103, and absorbs electromagnetic waves at one end of waveguide line 200. Terminator 503 is disposed at the other end of waveguide line 200 close to the other end 102, and absorbs electromagnetic waves at the other end of waveguide line 200.
[0066] The waveguide line 200 is bent at the bending point 204 in the range of 0 degrees to 180 degrees while maintaining its cross-sectional structure.
[0067] Next, a description will be given of the operation of the wireless communication device 50. An electromagnetic wave transmitted from the transmitting antenna 501 is transmitted through the waveguide line 200 and is absorbed by the terminators 503 and 504.
[0068] The electromagnetic waves input to the waveguide line 200 are transmitted with little loss to the ends 102 and 103 of the waveguide line 200, if the cross-sectional structure of the waveguide line 200 is suitable for forming a transmission mode. At this time, the electromagnetic waves input to the waveguide line 200 exist with a constant intensity inside the waveguide line 200. Therefore, no matter where the receiving antenna 120 is located in the axial direction of the waveguide line 200, the receiving antenna 120 receives the electromagnetic waves with a constant intensity, and stable communication can be achieved between the transmitting antenna 501 and the receiving antenna 120. This enables faster wireless communication and improved reliability.
[0069] Sixth embodiment Fig. 13 is a diagram showing a configuration example of a wireless communication device 60 according to a sixth embodiment. In the wireless communication device 60 in Fig. 13 described below, the configurations already described in the wireless communication device 20 shown above are denoted by the same reference numerals, and description thereof will be omitted.
[0070] 13 includes a waveguide line 600, a transmitting antenna 110, a receiving antenna 120, and a terminator 130. Receiving antennas 120a, 120b, and 120c indicate different positions of the receiving antenna 120 that can be moved within the waveguide line 600.
[0071] The waveguide-type line 600 has a first bending point 604 and a second bending point 605. The waveguide-type line 600 is bent at the two bending points 604 and 605 in the range of 0 degrees to 180 degrees while maintaining the cross-sectional structure. In addition, the waveguide-type line 600 has an open surface 101 along the tube axis direction that is open. The waveguide-type line 600 can be bent at two or more bending points.
[0072] Next, the operation of the wireless communication device 60 will be described. The electromagnetic wave transmitted from the transmitting antenna 110 is transmitted through the waveguide-type line 600 and absorbed by the terminator 130. If the cross-sectional structure of the waveguide-type line 600 is suitable for forming a transmission mode, the electromagnetic wave input to the waveguide-type line 600 is transmitted to the end 103 of the waveguide-type line 600 with small loss. At this time, the electromagnetic wave input to the waveguide-type line 600 exists in the waveguide-type line 600 with a constant intensity. Therefore, no matter where the receiving antenna 120 is located in the tube axis direction of the waveguide-type line 600 such as the receiving antennas 120a, 120b, and 120c shown in FIG. 13, the receiving antenna 120 receives the electromagnetic wave with a constant intensity. This enables stable communication between the transmitting antenna 110 and the receiving antenna 120, and enables high-speed wireless communication and improved reliability.
[0073] It should be noted that the above-described embodiments are merely illustrative of specific examples of implementing the present disclosure, and the technical scope of the present disclosure should not be interpreted as being limited by these embodiments. In other words, the present disclosure can be implemented in various forms without departing from its technical concept or main features.
[0074] The disclosure of this embodiment includes the following configuration. (Configuration 1) a waveguide type line having an open surface along the tube axis; a first terminator that absorbs electromagnetic waves at one end of the waveguide line; A first antenna; a second antenna that is movable along the axial direction of the waveguide line and that communicates electromagnetic waves with the first antenna; The waveguide-type line wirelessly transmits electromagnetic waves between the first antenna and the second antenna, and the length of a side perpendicular to the open surface is equal to or longer than three wavelengths of the carrier frequency of the electromagnetic waves. (Configuration 2) 2. The wireless communication device according to claim 1, wherein the first antenna is disposed at the other end of the waveguide line. (Configuration 3) a second terminator that absorbs electromagnetic waves at the other end of the waveguide line; 2. The wireless communication device according to claim 1, wherein the first antenna is movable along an axial direction of the waveguide line. (Configuration 4) 4. The wireless communication device according to any one of configurations 1 to 3, wherein the second antenna is disposed inside the waveguide line. (Configuration 5) 4. The wireless communication device according to configuration 3, wherein the first antenna and the second antenna are disposed inside the waveguide line. (Configuration 6) 6. The wireless communication device according to any one of configurations 1 to 5, wherein the first antenna is a transmitting antenna, and the second antenna is a receiving antenna. (Configuration 7) 6. The wireless communication device according to any one of configurations 1 to 5, wherein the first antenna is a receiving antenna, and the second antenna is a transmitting antenna. (Configuration 8) 8. The wireless communication device according to any one of configurations 1 to 7, wherein the waveguide line is bent while maintaining its cross-sectional structure. (Configuration 9) 9. The wireless communication device according to configuration 8, wherein the waveguide line is bent in a range of 0 degrees to 180 degrees while maintaining a cross-sectional structure. (Configuration 10) 10. The wireless communication device according to configuration 9, wherein the waveguide line is bent at 90 degrees while maintaining its cross-sectional structure. (Configuration 11) The wireless communication device according to configuration 10, wherein the length of the side perpendicular to the open surface of the waveguide line is equal to or greater than three wavelengths of the carrier frequency of the electromagnetic wave, and the length of the side horizontal to the open surface is equal to or less than the wavelength of the carrier frequency of the electromagnetic wave. (Configuration 12) 10. The wireless communication device according to configuration 9, wherein the waveguide-type line is bent by 180 degrees while maintaining its cross-sectional structure. (Configuration 13) The wireless communication device according to configuration 12, wherein the length of the side perpendicular to the open surface of the waveguide line is equal to or greater than four wavelengths of the carrier frequency of the electromagnetic wave, and the length of the side horizontal to the open surface is equal to or less than half the wavelength of the carrier frequency of the electromagnetic wave. (Configuration 14) 9. The wireless communication device according to configuration 8, wherein the waveguide-type line is bent at two or more points. (Configuration 15) 15. The wireless communication device according to any one of configurations 1 to 14, wherein the waveguide-type line has a rectangular cross-sectional structure. (Configuration 16) 16. The wireless communication device according to any one of configurations 1 to 15, wherein the carrier wave is a millimeter wave. [Explanation of symbols]
[0075] 10, 20, 30, 40, 50, 60 Wireless communication device; 100, 200, 400, 600 Waveguide line; 101 Open surface of waveguide line; 102, 103 End of waveguide line; 110, 501 Transmitting antenna; 120 Receiving antenna; 130, 503, 504 Termination device; 204, 604, 605 Bend point of waveguide line
Claims
1. a waveguide type line having an open surface along the tube axis; a first terminator for absorbing electromagnetic waves at one end of the waveguide line; A first antenna; a second antenna that is movable along an axial direction of the waveguide line and that communicates electromagnetic waves with the first antenna, The waveguide-type line wirelessly transmits electromagnetic waves between the first antenna and the second antenna, and the length of a side perpendicular to the open surface is equal to or longer than three wavelengths of the carrier frequency of the electromagnetic waves.
2. The wireless communication device according to claim 1 , wherein the first antenna is disposed at the other end of the waveguide line.
3. a second terminator for absorbing electromagnetic waves at the other end of the waveguide line; 2. The wireless communication device according to claim 1, wherein the first antenna is movable along an axial direction of the waveguide line.
4. The wireless communication device according to claim 1 , wherein the second antenna is disposed inside the waveguide-type line.
5. 4. The wireless communication device according to claim 3, wherein the first antenna and the second antenna are disposed inside the waveguide line.
6. 2. The wireless communication device according to claim 1, wherein the first antenna is a transmitting antenna and the second antenna is a receiving antenna.
7. 2. The wireless communication device according to claim 1, wherein the first antenna is a receiving antenna and the second antenna is a transmitting antenna.
8. 2. The wireless communication device according to claim 1, wherein the waveguide-type line is bent while maintaining its cross-sectional structure.
9. 9. The wireless communication device according to claim 8, wherein the waveguide-type line is bent in a range of 0 degrees to 180 degrees while maintaining a cross-sectional structure.
10. 10. The wireless communication device according to claim 9, wherein the waveguide type line is bent by 90 degrees while maintaining its cross-sectional structure.
11. 11. The wireless communication device according to claim 10, wherein the length of a side perpendicular to the open surface of the waveguide line is equal to or greater than three wavelengths of the carrier frequency of the electromagnetic wave, and the length of a side horizontal to the open surface is equal to or less than the wavelength of the carrier frequency of the electromagnetic wave.
12. 10. The wireless communication device according to claim 9, wherein the waveguide-type line is bent by 180 degrees while maintaining its cross-sectional structure.
13. 13. The wireless communication device according to claim 12, wherein the length of a side perpendicular to the open surface of the waveguide line is equal to or greater than four wavelengths of the carrier frequency of the electromagnetic wave, and the length of a side horizontal to the open surface is equal to or less than half the wavelength of the carrier frequency of the electromagnetic wave.
14. 9. The wireless communication device according to claim 8, wherein the waveguide-type line is bent at two or more points.
15. 2. The wireless communication device according to claim 1, wherein the waveguide type line has a rectangular cross-sectional structure.
16. 2. The wireless communication device according to claim 1, wherein the carrier wave is a millimeter wave.
Citation Information
Patent Citations
Microstrip line and microwave device using the same
JP2001230606A