WO2022224894A1 - アンテナ及び無線通信装置 - Google Patents

アンテナ及び無線通信装置 Download PDF

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Publication number
WO2022224894A1
WO2022224894A1 PCT/JP2022/017723 JP2022017723W WO2022224894A1 WO 2022224894 A1 WO2022224894 A1 WO 2022224894A1 JP 2022017723 W JP2022017723 W JP 2022017723W WO 2022224894 A1 WO2022224894 A1 WO 2022224894A1
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WIPO (PCT)
Prior art keywords
conductor
antenna
coaxial cable
model
graph
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/017723
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English (en)
French (fr)
Japanese (ja)
Inventor
周一 山本
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Kyocera Corp
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Kyocera Corp
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Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP2023515437A priority Critical patent/JP7618022B2/ja
Publication of WO2022224894A1 publication Critical patent/WO2022224894A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas

Definitions

  • the present disclosure relates to antennas and wireless communication devices.
  • Patent Literature 1 discloses a technique of arranging an antenna on a surface facing a cable extraction surface so that the magnetic field from the antenna is less affected by the cable.
  • An antenna includes an antenna section and a coaxial cable having one end connected to the antenna section and the other end connected to an external device, wherein the antenna section includes a first conductor extending in a first plane direction. a second conductor facing the first end of the first conductor in the first direction and extending in the first surface direction connected to the first conductor; a third conductor facing the two ends, connected to the first conductor, extending in the first surface direction and aligned in the first direction with the second conductor, the second conductor, and the third conductor; at least one fourth conductor extending in the first plane direction spaced apart from the second conductor and the third conductor between the first direction, wherein the coaxial cable is connected to the antenna connected to a connection point at a position displaced in the first direction from the center of the portion in the first direction, extending in the direction of the first surface toward the center in the first direction, and extending in the first direction. It is pulled out to the outside of the antenna section from between the center and the connection point.
  • An antenna includes an antenna section and a coaxial cable having one end connected to the antenna section and the other end connected to an external device, wherein the antenna section includes a first conductor extending in a first plane direction. a second conductor facing the first end of the first conductor in the first direction and extending in the first surface direction connected to the first conductor; a third conductor facing the two ends, connected to the first conductor, extending in the first surface direction and aligned in the first direction with the second conductor, the second conductor, and the third conductor; at least one fourth conductor extending in the first plane direction spaced apart from the second conductor and the third conductor between the first direction, wherein the coaxial cable is connected to the antenna connected to a connection point located at a position displaced in the first direction from the center of the portion in the first direction, and extending in the direction of the first surface in a direction opposite to the direction toward the center in the first direction. It is pulled out to the outside of the antenna section from a position opposite to the center in the first direction.
  • a wireless communication device includes an antenna according to the present disclosure, and a controller that controls the antenna and communicates with an external electronic device.
  • FIG. 1 is a diagram showing a configuration example of an antenna according to an embodiment.
  • FIG. 2 is a diagram showing a configuration example of the upper conductor of the antenna according to the embodiment.
  • FIG. 3 is a diagram showing a configuration example of the lower conductor of the antenna according to the embodiment.
  • FIG. 4 is a diagram for explaining a method of arranging the coaxial cable so that it does not act like an antenna.
  • FIG. 5 is a diagram for explaining a method of arranging the first conductor of the coaxial cable outside.
  • FIG. 6 is a diagram for explaining a method of arranging a coaxial cable to act like an antenna.
  • FIG. 7 is a diagram for explaining a method of arranging a coaxial cable to act like an antenna.
  • FIG. 1 is a diagram showing a configuration example of an antenna according to an embodiment.
  • FIG. 2 is a diagram showing a configuration example of the upper conductor of the antenna according to the embodiment.
  • FIG. 3 is a diagram showing a configuration example of the
  • FIG. 8A is a diagram for explaining an antenna model according to the embodiment
  • FIG. 8B is a diagram for explaining an antenna model according to the embodiment
  • FIG. 8C is a diagram for explaining an antenna model according to the embodiment
  • FIG. 9 is a graph for explaining simulation results of antenna radiation efficiency in free space.
  • FIG. 10 is a graph for explaining simulation results of antenna radiation efficiency on metal.
  • FIG. 11 is a diagram for explaining the angle at the position of the feeding point of the coaxial cable.
  • FIG. 12 is a graph for explaining a simulation result of antenna radiation efficiency according to different angles at which the coaxial cable is pulled out from the antenna section in free space.
  • 13A and 13B are graphs for explaining simulation results of antenna radiation efficiency according to different angles at which the coaxial cable is pulled out from the antenna section in free space.
  • FIG. 14 is a diagram showing an antenna model in which the coaxial cable is pulled out from the antenna section and then bent.
  • FIG. 15 is a graph for explaining changes in antenna radiation efficiency when the coaxial cable is bent when the coaxial cable is drawn out from the antenna section in free space.
  • FIG. 16 is a block diagram illustrating a configuration example of a wireless communication device according to an embodiment
  • an XYZ orthogonal coordinate system is set, and the positional relationship of each part will be described with reference to this XYZ orthogonal coordinate system.
  • the direction parallel to the X-axis in the horizontal plane is the X-axis direction
  • the direction parallel to the Y-axis in the horizontal plane orthogonal to the X-axis is the Y-axis direction
  • the direction parallel to the Z-axis orthogonal to the horizontal plane is the Z-axis direction.
  • a plane containing the X-axis and the Y-axis is appropriately referred to as an XY plane.
  • a plane containing the X-axis and the Z-axis is appropriately called an XZ plane.
  • a plane containing the Y-axis and the Z-axis is appropriately referred to as a YZ plane.
  • the XY plane is parallel to the horizontal plane.
  • the XY plane, the XZ plane, and the YZ plane are orthogonal.
  • FIG. 1 is a diagram showing a configuration example of an antenna according to an embodiment.
  • FIG. 2 is a diagram showing a configuration example of the upper conductor of the antenna according to the embodiment.
  • FIG. 3 is a diagram showing a configuration example of the lower conductor of the antenna according to the embodiment.
  • the antenna 1 includes a first conductor 10, a second conductor 12, a third conductor 14, a fourth conductor 16, a first connection conductor 201, a first connection conductor 20-2, a second connection conductor 22-1, a second connection conductor 22-2 , a feed conductor 24, a coaxial cable 30, and a metal member 40.
  • the connection conductor 222 is sometimes called an antenna section.
  • the first connection conductor 20-1 and the first connection conductor 20-2 may be collectively referred to as the first connection conductor 20 in some cases.
  • the second connection conductor 22-1 and the second connection conductor 22-2 may be collectively referred to as the second connection conductor 22 in some cases.
  • the antenna 1 is configured to be able to radiate circularly polarized waves.
  • the antenna 1 is configured to exhibit an artificial magnetic wall characteristic (Artificial Magnetic Conductor Character) with respect to electromagnetic waves of a predetermined frequency incident on the XY plane of the antenna 1 from the positive direction side of the Z axis.
  • artificial magnetic wall properties means properties of a surface where the phase difference between an incident wave and a reflected wave is 0 degree. On the surface having artificial magnetic wall characteristics, the phase difference between the incident wave and the reflected wave is ⁇ 90 degrees to +90 degrees in the frequency band.
  • the first conductor 10 is a conductor extending in the XY plane.
  • the XY plane is sometimes called the first plane.
  • the first conductor 10 is, for example, substantially rectangular, but is not limited to this.
  • the width of the first conductor 10 in the Y-axis direction is wider than the widths of the second conductor 12 , the third conductor 14 , and the fourth conductor 16 .
  • the first conductor 10 is arranged on, for example, a plate-like metal member 40 .
  • the antenna 1 does not have to include the metal member 40 .
  • the metal member 40 is a type of conductive article.
  • the second conductor 12, the third conductor 14, and the fourth conductor 16 are located apart from the first conductor 10 in the Z-axis direction.
  • the second conductor 12 , the third conductor 14 and the fourth conductor 16 face the first conductor 10 .
  • the second conductor 12 , the third conductor 14 and the fourth conductor 16 are sometimes called upper conductors of the antenna 1 .
  • the widths in the Y-axis direction of the second conductor 12, the third conductor 14, and the fourth conductor 16 may be the same.
  • the width in the X-axis direction of the second conductor 12 and the third conductor 14 may be the same.
  • the width of the fourth conductor 16 in the X-axis direction is wider than the width of the second conductor 12 and the third conductor 14 in the X-axis direction.
  • the second conductor 12 faces the first end of the first conductor 10 in the X-axis direction.
  • the X-axis direction is also called the first direction.
  • the first end is the end of the first conductor 10 on the negative direction side of the X axis.
  • the second conductor 12 is, for example, substantially rectangular, but is not limited to this.
  • the third conductor 14 faces the second end of the first conductor 10 in the X-axis direction.
  • the second end is the end of the first conductor 10 on the positive side of the X axis.
  • the third conductor 14 is, for example, substantially rectangular, but is not limited to this.
  • the third conductor 14 is aligned with the second conductor 12 along the X-axis direction.
  • the fourth conductor 16 is positioned between the second conductor 12 and the third conductor 14 .
  • the fourth conductor 16 is aligned with the second conductor 12 and the third conductor 14 along the X-axis direction.
  • the fourth conductor 16 is not in contact with the second conductor 12 and the third conductor 14 . That is, there are gaps between the second conductor 12 and the fourth conductor 16 and between the third conductor 14 and the fourth conductor 16 .
  • the fourth conductor 16 faces the first conductor 10 between the second conductor 12 and the third conductor 14 .
  • the fourth conductor 16 is, for example, substantially rectangular, but is not limited to this.
  • a plurality of fourth conductors 16 may be positioned between the second conductors 12 and the third conductors 14 .
  • the respective fourth conductors 16 are not in contact with each other.
  • the fourth conductors 16 are arranged side by side along the X-axis direction with gaps between them. That is, at least one fourth conductor 16 is positioned between the second conductor 12 and the third conductor 14 .
  • the second conductor 12 and the fourth conductor 16 are capacitively connected through a gap.
  • the third conductor 14 and the fourth conductor 16 are capacitively connected through a gap.
  • the respective fourth conductors are capacitively connected via a gap. .
  • the first connection conductor 20-1 and the first connection conductor 20-2 are configured to connect the first conductor 10 and the second conductor 12 together.
  • the first connection conductor 20-1 and the first connection conductor 20-2 are , for example, columnar bodies extending in the Z-axis direction.
  • the first connection conductor 20-1 and the first connection conductor 20-2 are arranged along the Y-axis direction.
  • the second connection conductor 22-1 and the second connection conductor 22-2 are configured to connect the first conductor 10 and the third conductor .
  • the second connection conductor 22-1 and the second connection conductor 22-2 are columnar bodies extending in the Z-axis direction, for example.
  • the second connection conductor 22-1 and the second connection conductor 22-2 are arranged along the Y-axis direction.
  • the feed conductor 24 is configured to connect the first conductor 10 and the fourth conductor 16 .
  • the feed conductor 24 is, for example, a columnar body extending in the Z-axis direction.
  • the feed conductor 24 is connected to the feed point P1 of the first conductor 10 .
  • the feed conductor 24 may be configured to connect the first conductor 10 and the second conductor 12 .
  • the feed conductor 24 may be configured to connect the first conductor 10 and the third conductor 14 .
  • the second conductor 12 to the fourth conductor 16 may be arranged on the same surface of an insulating substrate (not shown).
  • an insulating substrate is positioned above the second conductor 12 to the fourth conductor 16 in FIG. 1 may be used.
  • a structure in which an insulating substrate is positioned below the first conductor 10 in FIG. 1 may also be used.
  • One end of the coaxial cable 30 is connected to the feeding point P1.
  • the coaxial cable 30 is connected to an external device (not shown) at the other end.
  • One end of the coaxial cable 30 is connected to the feed point P1 by, for example, a connector terminal (not shown).
  • the feed point P1 is sometimes called a connection point.
  • the antenna characteristics of the antenna 1 change because the coaxial cable 30 acts like an antenna.
  • the coaxial cable 30 By arranging the coaxial cable 30 so as not to act like an antenna, it is required to stabilize the antenna characteristics of the antenna 1 regardless of the presence or absence of the metal member 40 .
  • FIG. 4 is a diagram for explaining a method of arranging the coaxial cable so that it does not act like an antenna.
  • the first conductor 10 is shown in FIG. In FIG. 4, the X-axis direction is sometimes called the longitudinal direction, and the Y-axis direction is sometimes called the lateral direction. It is assumed that the feeding point P1 is provided at a position L1 in the positive X-axis direction from the center O1 of the first conductor 10 in the X-axis direction and at a position L2 in the negative Y-axis direction from the upper side of the first conductor 10 .
  • the Y-axis direction is also called the second direction.
  • the feeding point P1 is normally arranged off the center of the first conductor 10 for impedance adjustment.
  • the coaxial cable 30 is preferably extended from the feed point P1 toward the center of the first conductor 10 and pulled out of the antenna section. Specifically, the coaxial cable 30 is preferably pulled out from the upper side of the first conductor 10 within the range of the distance L1. The coaxial cable 30 may be pulled out from the lower side of the first conductor 10 within the range of the distance L1.
  • the direction of the current I1 flowing in the antenna 1 is opposite to the direction of the current I10 flowing in the coaxial cable 30. direction.
  • the current I1 flows in the positive direction of the X-axis
  • the current I10 flows in the negative direction of the X-axis.
  • the coaxial cable 30 is drawn outside the antenna section from the position P11.
  • the position P11 may be the position where the upper sides of the upper conductor and the lower conductor spatially overlap.
  • the coaxial cable 30 may be fixed at the position P11 with a fastener, resin, or the like to prevent displacement.
  • the direction of the electric field radiated by the antenna 1 is opposite between the positive direction side and the negative direction side of the X-axis from the center O1. Therefore, the direction of the electric field radiated by the antenna 1 is the same at the position P11 and the feeding point P1. Therefore, the direction of the magnetic field generated from the antenna 1 and the direction of the magnetic field generated from the coaxial cable 30 are opposite to each other. In other words, the magnetic field of antenna 1 weakens the magnetic field generated from coaxial cable 30 .
  • the weakening of the magnetic field from the coaxial cable 30 makes it difficult for the coaxial cable 30 to act as an antenna.
  • the coaxial cable 30 should be arranged at a longer distance from the feeding point P1 with respect to the longitudinal direction of the first conductor 10 .
  • the distance L3 from the feeding point P1 to one of the short sides should be compared with the distance L4 to the other short side, and the longer side should be placed.
  • the coaxial cable 30 should be pulled out from the distance L3 side.
  • the coaxial cable 30 may be pulled out of the antenna section so that the overlapping distance between the coaxial cable 30 and the first conductor 10 is increased.
  • the feeding point P1 is displaced from the center of the first conductor 10 in the longitudinal direction (positive direction of the X-axis) and the lateral direction (negative direction of the Y-axis).
  • the coaxial cable 30 may be pulled out from the upper side or the lower side of the first conductor 10 as long as it is within the range of the distance L1.
  • the coaxial cable 30 is preferably arranged in the longer distance from the feeding point P1 in the lateral direction of the first conductor 10 .
  • the distance L2 from the feeding point P1 to one long side is compared with the distance L5 to the other long side, and the longer side should be arranged.
  • FIG. 4 the distance L2 from the feeding point P1 to one long side is compared with the distance L5 to the other long side, and the longer side should be arranged.
  • the coaxial cable 30 should be pulled out from the distance L2 side, that is, from the upper side of the first conductor 10 .
  • the coaxial cable 30 may be pulled out of the antenna section so that the overlapping distance between the coaxial cable 30 and the first conductor 10 is increased.
  • FIG. 5 is a diagram for explaining a method of arranging the first conductor 10 of the coaxial cable 30 outside.
  • the coaxial cable 30 may be oriented in a direction different from the direction in which it extends inside the antenna section. As shown in FIG. 5, for example, the coaxial cable 30 may be bent in the direction along the Y-axis after being pulled out from the position P11.
  • the coaxial cable 30 is not limited to the example shown in FIG. 5, and may be bent in any direction according to the design after being pulled out from the position P11.
  • the coaxial cable 30 it is also possible to arrange the coaxial cable 30 to act like an antenna. Antenna efficiency can be improved if the antenna 1 is used only in free space. In this embodiment, use of the antenna 1 in free space may mean use in a state where the metal member 40 is not included.
  • FIGS. 6 and 7 are diagrams for explaining a method of arranging the coaxial cable to act like an antenna.
  • the first conductor 10 is shown in FIG.
  • the coaxial cable 30 should be extended in the direction opposite to the direction toward the center O1 and pulled out from the antenna section.
  • the coaxial cable 30 may be pulled out from the position P21 on the upper side of the first conductor 10 within the range of the distance L4.
  • the direction of the current I1 flowing through the antenna 1 and the direction of the current I20 flowing through the coaxial cable 30 become the same.
  • the current I1 flows in the positive direction of the X-axis
  • the current I20 flows in the positive direction of the X-axis. Since the position P21 and the feeding point P1 are both located on the positive direction side from the center O1, the direction of the electric field radiated by the antenna 1 is the same at the position P21 and the feeding point P1.
  • the direction of the magnetic field generated from the antenna 1 and the direction of the magnetic field generated from the coaxial cable 30 are the same. In this case, the magnetic field of antenna 1 does not weaken the magnetic field of coaxial cable 30 . That is, coaxial cable 30 behaves as an antenna.
  • the first conductor 10 is shown in FIG. If the coaxial cable 30 is to act like an antenna, it should be extended beyond the center O1 and pulled out from the antenna section. For example, the coaxial cable 30 may be pulled out from the position P31 on the upper side of the first conductor 10 within the range of the distance L6.
  • the direction of the current I1 flowing through the antenna 1 and the direction of the current I30 flowing through the coaxial cable 30 become opposite.
  • the current I1 flows in the positive direction of the X-axis
  • the current I30 flows in the negative direction of the X-axis.
  • the direction of the electric field radiated by the antenna 1 is opposite between the positive direction side and the negative direction side of the X-axis from the center O1. Therefore, in the example shown in FIG.
  • the direction of the magnetic field generated by the coaxial cable 30 is opposite to the direction of the magnetic field generated by the antenna 1 in the portion located within the range of the distance L1, and the direction of the magnetic field generated by the antenna 1 is opposite to the direction of the magnetic field generated by the antenna 1 within the range of the distance L6.
  • the direction of the magnetic field generated from the antenna 1 is the same as that of the portion where the magnetic field is formed. Therefore, the portion of the coaxial cable 30 located within the range of the distance L1 becomes difficult to act as an antenna, but the portion located within the range of the distance L acts as an antenna. Thereby, the coaxial cable 30 behaves as an antenna.
  • FIGS. 8A, 8B, and 8C are diagrams for explaining the antenna model according to the embodiment.
  • the antenna model 100 includes a first conductor model 102, a second conductor model 104, a third conductor model 106, a fourth conductor model 108, and first connection conductor models 110 1 and 110 2 . , second connection conductor models 112 1 and 112 2 , a feed conductor model 114 , a connector model 116 and a coaxial cable model 118 .
  • An antenna model 100 is a model corresponding to the antenna 1 .
  • a first conductor model 102 corresponds to the first conductor 10 .
  • a second conductor model 104 corresponds to the second conductor 12 .
  • a third conductor model 106 corresponds to the third conductor 14 .
  • a fourth conductor model 108 corresponds to the fourth conductor 16 .
  • the first connection conductor models 110 1 and 110 2 correspond to the first connection conductors 20 1 and 20 2 respectively.
  • the second connection conductor models 112 1 and 112 2 correspond to the second connection conductors 22 1 and 22 2 respectively.
  • a feed conductor model 114 corresponds to the feed conductor 24 .
  • a first conductor model 102, a second conductor model 104, a third conductor model 106, a fourth conductor model 108, first connection conductor models 110 1 and 110 2 , and second connection conductor models 112 1 and 112 1 . 112 2 and the feeding conductor model 114 can be antenna part models corresponding to the antenna part.
  • the coaxial cable model 118 is pulled out of the antenna part model within the range of the distance L10 between the center O10 of the first conductor model 102 and the feed conductor model 114. ing. That is, the antenna model 100 is a model in which the coaxial cable 30 of the antenna 1 is arranged so as not to act like an antenna.
  • the coaxial cable model 118 is outside the antenna part model in the range of the distance L20 between the center O10 of the first conductor model 102 and the left end of the first conductor model 102. is drawn out to That is, the antenna model 100A is a model in which the coaxial cable 30 of the antenna 1 is arranged so as to act like an antenna.
  • the coaxial cable model 118 is pulled out of the antenna part model within the range of the distance L30 between the feeding conductor model 114 and the right end of the first conductor model 102.
  • the antenna model 100B is a model in which the coaxial cable 30 of the antenna 1 is arranged so as to act like an antenna.
  • FIG. 9 is a graph for explaining simulation results of antenna radiation efficiency in free space.
  • the horizontal axis indicates frequency [MHz]
  • the vertical axis indicates antenna radiation efficiency [dB].
  • FIG. 9 shows a graph G1, a graph G2, and a graph G3.
  • Graph G1 shows simulation results of the antenna radiation efficiency in free space for the antenna model 100 shown in FIG. 8A.
  • a graph G2 shows simulation results of the antenna radiation efficiency in free space of the antenna model 100A shown in FIG. 8B.
  • a graph G3 shows simulation results of the antenna radiation efficiency in free space of the antenna model 100B shown in FIG. 8C.
  • the antenna radiation efficiency of the antenna model 100 in the frequency band from 750 MHz to 950 MHz is about -13 dB to -3 dB.
  • a magnetic field is generated around coaxial cable model 118 in antenna model 100A.
  • the antenna radiation efficiency of the antenna model 100A in the frequency band from 750 MHz to 950 MHz is about -7 dB to -1.5 dB. That is, the antenna model 100A has improved antenna radiation efficiency compared to the antenna model 100.
  • a magnetic field is generated around the coaxial cable model 118 in the antenna model 100B.
  • the antenna radiation efficiency of the antenna model 100B in the frequency band from 750 MHz to 950 MHz is about -9 dB to -1 dB. That is, the antenna model 100B has improved antenna radiation efficiency compared to the antenna model 100.
  • FIG. 10 is a graph for explaining simulation results of antenna radiation efficiency on metal. Specifically, FIG. 10 shows simulation results of the antenna radiation efficiency when the first conductor model 102 shown in FIGS. 8A to 8C is placed on metal (not shown). In FIG. 10, the horizontal axis indicates frequency [MHz], and the vertical axis indicates antenna radiation efficiency [dB].
  • FIG. 10 shows a graph G11, a graph G12, and a graph G13.
  • a graph G11 shows simulation results of the antenna radiation efficiency on metal of the antenna model 100 shown in FIG. 8A.
  • a graph G2 shows simulation results of the antenna radiation efficiency on metal of the antenna model 100A shown in FIG. 8B.
  • a graph G3 shows simulation results of the antenna radiation efficiency on metal of the antenna model 100B shown in FIG. 8C.
  • graph G11, graph G12, and graph G13 substantially match in the frequency band from 750 MHz to 950 MHz.
  • the antenna radiation efficiency of the antenna models 100 to 100B in the frequency band from 750 MHz to 950 MHz is about -12 dB to -2.5 dB.
  • antenna model 100A and antenna model 100B do not generate a magnetic field around coaxial cable model 118 on metal, and the antenna radiation efficiency does not improve.
  • the coaxial cable 30 when the coaxial cable 30 is arranged so as not to act like an antenna, there is no change in the characteristics between when the antenna 1 is used in free space and when it is set on metal. In other words, the characteristics of the antenna 1 can be stabilized by arranging the coaxial cable 30 so as not to act like an antenna.
  • the antenna 1 can be improved when used in free space. That is, by arranging the coaxial cable 30 to act like an antenna, the antenna 1 can be configured as an antenna with high antenna radiation efficiency in free space.
  • the coaxial cable 30 may be arranged so as not to act like an antenna, or arranged so as to act like an antenna.
  • FIG. 11 is a diagram for explaining the angle at the position of the feeding point P1 of the coaxial cable.
  • the angle on the positive side of the Y-axis is 0°
  • the angle on the negative side of the X-axis is 90°
  • the angle on the negative side of the Y-axis is 180°
  • the angle on the positive side of the X-axis is Let the angle be 270°.
  • FIG. 12 is a graph for explaining the simulation results of the antenna radiation efficiency depending on the angle at which the coaxial cable is pulled out from the antenna section in free space.
  • the horizontal axis indicates frequency [MHz]
  • the vertical axis indicates antenna radiation efficiency [dB].
  • FIG. 12 shows a graph G21, a graph G22, a graph G23, a graph G24, a graph G25, and a graph G26.
  • a graph G21 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 80°.
  • a graph G22 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 70°.
  • a graph G23 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 50°.
  • a graph G24 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 30°.
  • a graph G25 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 0°.
  • a graph G26 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 330°.
  • the graph G21 and the graph G22 show the simulation result of the antenna radiation efficiency when the coaxial cable 30 is pulled out from the antenna section within the range of the distance L6 in the example shown in FIG.
  • a graph G23 and a graph G24 show simulation results of the antenna radiation efficiency when the coaxial cable 30 is pulled out from the antenna section within the range of the distance L1 in the example shown in FIG.
  • a graph G26 shows a simulation result of the antenna radiation efficiency when the coaxial cable 30 is pulled out from the antenna section within the range of the distance L3 in the example shown in FIG.
  • the antenna radiation efficiency is relatively low.
  • the magnetic field generated from the coaxial cable 30 is weak, meaning that the coaxial cable 30 does not act as an antenna.
  • the antenna radiation efficiency is relatively high when the coaxial cable 30 is pulled out from the antenna section at angles of 80°, 70°, 0°, and 330°.
  • the magnetic field generated from the coaxial cable 30 is strong, which means that the coaxial cable 30 acts as an antenna.
  • FIG. 13 is a graph for explaining simulation results of antenna radiation efficiency due to differences in the angle at which the coaxial cable is pulled out from the antenna section in free space.
  • the horizontal axis indicates frequency [MHz]
  • the vertical axis indicates antenna radiation efficiency [dB].
  • FIG. 13 shows a graph G31, a graph G32, a graph G33, a graph G34, a graph G35, and a graph G36.
  • a graph G31 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 0°.
  • a graph G32 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 330°.
  • a graph G33 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 30°.
  • a graph G34 shows simulation results of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 180°.
  • a graph G35 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 210°.
  • a graph G36 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 150°.
  • the coaxial cable 30 is linearly symmetrical with respect to the X-axis, depending on whether the angle at which the coaxial cable 30 is pulled out from the antenna section is 0° or 180°.
  • the coaxial cable 30 is linearly symmetrical with respect to the X-axis, depending on whether the angle at which the coaxial cable 30 is pulled out from the antenna section is 30 degrees or 150 degrees.
  • the coaxial cable 30 is linearly symmetrical with respect to the X-axis when the angle at which the coaxial cable 30 is pulled out from the antenna section is 210° and when it is 330°.
  • the antenna radiation efficiency is relatively high.
  • the magnetic field generated from the coaxial cable 30 is strong, meaning that the coaxial cable 30 acts as an antenna.
  • the antenna radiation efficiency is relatively low when the angles at which the coaxial cable 30 is pulled out from the antenna section are 30° and 150°. Comparing the graph G33 and the graph G36, the antenna radiation efficiency is higher when the angle at which the coaxial cable 30 is pulled out from the antenna section is 150 degrees than when it is 30 degrees. This is because the distance over which the first conductor 10 and the fourth conductor 16 overlap when the coaxial cable 30 is pulled out from the antenna section is longer when the angle of the feeding point P1 of the coaxial cable 30 is 30° than when it is 150°. Because it is long. When the coaxial cable 30 is pulled out from the antenna section, the longer the distance over which the first conductor 10 and the fourth conductor 16 overlap, the more the coaxial cable 30 can be suppressed from acting as an antenna.
  • FIG. 14 is a diagram showing an antenna model in which the coaxial cable 30 is bent after being pulled out from the antenna section.
  • the antenna model 100C when the coaxial cable model 118 is pulled out from the antenna part model, the first conductor model 102 and the upper side of the fourth conductor model 108 are bent along the Y axis from the position where they spatially overlap. The change of antenna radiation efficiency in case is analyzed.
  • FIG. 15 is a graph for explaining changes in antenna radiation efficiency when the coaxial cable is bent when the coaxial cable is pulled out from the antenna section in free space.
  • the horizontal axis indicates frequency [MHz]
  • the vertical axis indicates antenna radiation efficiency [dB].
  • FIG. 15 shows a graph G41, a graph G42, a graph G43, and a graph G44.
  • a graph G41 shows a simulation result of the antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 70°.
  • a graph G42 shows a simulation result of antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 30°.
  • a graph G43 shows a simulation result of the antenna radiation efficiency when the angle of the coaxial cable 30 at the feed point P1 is 70° and the coaxial cable 30 is bent in the direction of 0° when pulled out from the antenna section.
  • a graph G44 shows a simulation result of the antenna radiation efficiency when the angle at which the coaxial cable 30 is pulled out from the antenna section is 30° and the coaxial cable 30 is bent in the direction of 0° when being pulled out from the antenna section.
  • the coaxial cable 30 after the coaxial cable 30 is drawn out from the antenna section, it may be freely bent.
  • FIG. 16 is a block diagram showing a configuration example of a wireless communication device according to this embodiment.
  • the wireless communication device 200 includes at least an antenna 1 and a controller 3.
  • Wireless communication device 200 may further include memory 2 , sensor 4 , and battery 5 .
  • the memory 2 may include, for example, a semiconductor memory. Memory 2 may be configured to function as a work memory for controller 3 . Memory 2 may be included in controller 3 . The memory 2 stores a program describing the processing content for realizing each function of the wireless communication device 200, information used in the wireless communication device 200, and the like.
  • the controller 3 may include, for example, a processor. Controller 3 may include one or more processors.
  • the processor may include a general-purpose processor that loads a specific program to execute a specific function, and a dedicated processor that specializes in specific processing.
  • a dedicated processor may include an application specific IC. Application-specific ICs are also called ASICs (Application Specific Integrated Circuits).
  • a processor may include a programmable logic device. A programmable logic device is also called a PLD (Programmable Logic Device).
  • the PLD may include an FPGA (Field-Programmable Gate Array).
  • the controller 3 may be either SoC (System-on-a-Chip) or SiP (System in a Package) in which one or more processors cooperate.
  • the controller 3 may store various information or programs for operating each component of the wireless communication device 200 in the memory 2 .
  • the controller 3 can be configured to generate a transmission signal to be transmitted from the wireless communication device 200 .
  • Controller 3 may, for example, be configured to obtain measurement data from sensor 4 .
  • the controller 3 may be arranged to generate a transmission signal responsive to the measured data.
  • Controller 3 may be configured to transmit baseband signals to antenna 1 .
  • the sensor 4 includes various sensors.
  • the sensor 4 includes, for example, a speed sensor, a vibration sensor, an acceleration sensor, a gyro sensor, a rotation angle sensor, an angular velocity sensor, a geomagnetic sensor, a magnet sensor, a temperature sensor, a humidity sensor, an atmospheric pressure sensor, an optical sensor, an illuminance sensor, a UV sensor, and a gas sensor.
  • gas concentration sensor, atmosphere sensor, level sensor, smell sensor, pressure sensor, air pressure sensor, contact sensor, wind sensor, infrared sensor, motion sensor, displacement sensor, image sensor, weight sensor, smoke sensor, leak sensor, Vital sensors, battery level sensors, ultrasonic sensors, and the like may be included.
  • the sensor 4 may include a GNSS (Global Navigation Satellite System) sensor that acquires current location information of the wireless communication device 200 .
  • GNSS Global Navigation Satellite System
  • the battery 5 may be configured to power the wireless communication device 200 .
  • Battery 5 may be configured to power at least one of memory 2 , controller 3 and sensor 4 .
  • Battery 5 may include at least one of a primary battery and a secondary battery.
  • a negative electrode of the battery 5 can be configured to be electrically connected to a ground terminal of a circuit board (not shown).
  • the present invention is not limited by the contents of these embodiments.
  • the components described above include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those within the so-called equivalent range.
  • the components described above can be combined as appropriate.
  • various omissions, replacements, or modifications of components can be made without departing from the gist of the above-described embodiments.
  • antenna 10 first conductor 12 second conductor 14 third conductor 16 fourth conductor 20 first connection conductor 22 second connection conductor 24 feeding conductor 30 coaxial cable 40 metal member 100, 100A, 100B, 100C antenna model 102 first conductor model 104 second conductor model 106 third conductor model 108 fourth conductor model 110 1 , 110 2 first connection conductor model 112 1 , 112 2 second connection conductor model 114 feeder conductor model 116 connector model 200 wireless communication device

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Publication number Priority date Publication date Assignee Title
WO2025070393A1 (ja) * 2023-09-28 2025-04-03 京セラ株式会社 アンテナおよび無線通信装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010116675A1 (ja) * 2009-03-30 2010-10-14 日本電気株式会社 共振器アンテナ
WO2018174026A1 (ja) * 2017-03-21 2018-09-27 京セラ株式会社 構造体、アンテナ、無線通信モジュール、および無線通信機器
WO2021132181A1 (ja) * 2019-12-26 2021-07-01 京セラ株式会社 アンテナ、無線通信モジュール及び無線通信機器
WO2021132143A1 (ja) * 2019-12-24 2021-07-01 京セラ株式会社 アンテナ、無線通信モジュール及び無線通信機器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010116675A1 (ja) * 2009-03-30 2010-10-14 日本電気株式会社 共振器アンテナ
WO2018174026A1 (ja) * 2017-03-21 2018-09-27 京セラ株式会社 構造体、アンテナ、無線通信モジュール、および無線通信機器
WO2021132143A1 (ja) * 2019-12-24 2021-07-01 京セラ株式会社 アンテナ、無線通信モジュール及び無線通信機器
WO2021132181A1 (ja) * 2019-12-26 2021-07-01 京セラ株式会社 アンテナ、無線通信モジュール及び無線通信機器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025070393A1 (ja) * 2023-09-28 2025-04-03 京セラ株式会社 アンテナおよび無線通信装置

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