WO2023120678A1 - 無線通信装置、および構造体 - Google Patents

無線通信装置、および構造体 Download PDF

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Publication number
WO2023120678A1
WO2023120678A1 PCT/JP2022/047492 JP2022047492W WO2023120678A1 WO 2023120678 A1 WO2023120678 A1 WO 2023120678A1 JP 2022047492 W JP2022047492 W JP 2022047492W WO 2023120678 A1 WO2023120678 A1 WO 2023120678A1
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WIPO (PCT)
Prior art keywords
conductor
antenna
communication unit
connection
wireless communication
Prior art date
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/JP2022/047492
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English (en)
French (fr)
Japanese (ja)
Inventor
周一 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to EP22911380.8A priority Critical patent/EP4456332A1/en
Priority to JP2023569556A priority patent/JP7612896B2/ja
Priority to US18/723,077 priority patent/US20250062540A1/en
Publication of WO2023120678A1 publication Critical patent/WO2023120678A1/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
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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
    • 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present disclosure relates to wireless communication devices and structures.
  • Patent Literature 1 describes a downsized wireless communication device in which an antenna and a communication unit are built in one housing.
  • a wireless communication device includes an antenna, and a communication unit arranged inside the antenna and performing wireless communication with an external device via the antenna, the antenna extending in a first plane direction. a first conductor, a second conductor facing a first end of the first conductor in the first direction and extending in the first surface direction and connected to the first conductor, and the first conductor of the first conductor in the first direction.
  • a third conductor facing the second end of the and connected to the first conductor and extending in the first surface direction aligned with the second conductor in the first direction; the second conductor; and the third conductor and at least one fourth conductor extending in the first surface direction, positioned apart from the second conductor and the third conductor, and one end connected to the first conductor , a first connection conductor having the other end connected to the second conductor, a second connection conductor having one end connected to the first conductor and the other end connected to the third conductor, and one end connected to a feeding point a power supply conductor having the other end connected to a conductor facing the power supply point among the first conductor, the second conductor, the third conductor, and the fourth conductor;
  • the unit is arranged inside the antenna at a position where the magnetic field strength is relatively strong.
  • a structure according to the present disclosure includes a wireless communication device according to the present disclosure.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication device according to the first embodiment.
  • FIG. 2 is a diagram showing a configuration example of the top conductor of the antenna according to the first embodiment.
  • FIG. 3 is a diagram showing a configuration example of the bottom conductor of the antenna according to the first embodiment.
  • FIG. 4 is a block diagram showing a configuration example of a communication unit according to the first embodiment;
  • FIG. 5 is a diagram showing current flow in the wireless communication device according to the first embodiment.
  • FIG. 6 is a diagram showing the current flow in the top conductor of the antenna according to the first embodiment.
  • FIG. 7 is a diagram showing the current flow in the bottom conductor of the antenna according to the first embodiment.
  • FIG. 8 is a diagram for explaining the flow of the magnetic field inside the antenna according to the first embodiment.
  • FIG. 9 is a diagram showing a simulation result of magnetic field intensity inside the antenna according to the first embodiment.
  • FIG. 10 is a diagram for explaining a method of arranging communication units according to the first comparative example.
  • FIG. 11 is a diagram showing the flow of the magnetic field inside the antenna according to the first comparative example.
  • FIG. 12 is a diagram for explaining the radiation efficiency of the antenna according to the first comparative example.
  • FIG. 13 is a diagram for explaining a method of arranging communication units according to the second comparative example.
  • FIG. 14 is a diagram showing the flow of the magnetic field inside the antenna according to the second comparative example.
  • FIG. 15 is a diagram for explaining the radiation efficiency of the antenna according to the second comparative example.
  • FIG. 16 is a diagram for explaining a method of arranging communication units according to the first embodiment.
  • FIG. 17 is a diagram showing the flow of the magnetic field inside the antenna according to the first embodiment.
  • FIG. 18 is a diagram for explaining radiation efficiency of the antenna according to the first embodiment.
  • FIG. 19 is a diagram for explaining radiation efficiency of the antenna according to the first embodiment.
  • FIG. 20 is a diagram for explaining the orientation of the communication units according to the first embodiment.
  • FIG. 21 is a diagram for explaining the arrangement direction of the communication unit and the radiation efficiency of the antenna according to the first embodiment.
  • FIG. 22 is a diagram illustrating a configuration example of a wireless communication device according to the second embodiment.
  • FIG. 23 is a diagram showing a configuration example of the top conductor of the antenna according to the second embodiment.
  • FIG. 24 is a diagram for explaining the radiation efficiency of the antenna according to the second embodiment.
  • FIG. 25 is a diagram showing a method of arranging the communication unit on the bottom conductor of the antenna according to the second embodiment.
  • FIG. 26 is a diagram showing a configuration example of a bottom conductor according to a modification of the second embodiment.
  • an XYZ orthogonal coordinate system is set, and the positional relationship of each part will be explained 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 a wireless communication device according to the first embodiment.
  • FIG. 2 is a diagram showing a configuration example of the top conductor of the antenna according to the first embodiment.
  • FIG. 3 is a diagram showing a configuration example of the bottom conductor of the antenna according to the first embodiment.
  • FIG. 1 shows a sectional view taken along line II in FIG.
  • the wireless communication device 1 includes an antenna 2 and a communication unit 3.
  • the antenna 2 includes a first conductor 10, a second conductor 12, a third conductor 14, a fourth conductor 16, a first connection conductor 20-1 , a first connection conductor 20-2 , and a second connection conductor 22-1. , a second connection conductor 222 , a feed conductor 24 and a housing 26 .
  • the connection conductor 222 and the feed conductor 24 are housed in a housing 26 .
  • 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 2 is mounted on the metal member 4 on the first conductor 10 side, for example.
  • the antenna 2 may not be mounted on the metal member 4 on the first conductor 10 side.
  • the metal member 4 is a kind of conductive article.
  • the antenna 2 is configured to be able to radiate circularly polarized waves.
  • the antenna 2 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 2 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 X-axis direction is sometimes called the first direction, and the Y-axis direction is sometimes called the second direction.
  • the first conductor 10 is sometimes called the bottom conductor of the antenna 2 .
  • the first conductor 10 is, for example, substantially rectangular, but is not limited to this.
  • the first conductor 10 has a rectangular shape whose length in the X-axis direction is longer than the length in the Y-axis direction.
  • the width of the first conductor 10 in the X-axis direction is wider than the widths of the second conductor 12 , the third conductor 14 , and the fourth conductor 16 .
  • 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 referred to as top conductors of the antenna 2 .
  • the widths in the Y-axis direction of the first conductor 10, 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 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, gaps are formed 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 When multiple fourth conductors 16 are positioned, the respective fourth conductors 16 are not in contact with each other. When a plurality of fourth conductors 16 are positioned, gaps are formed between the respective fourth conductors 16 and are aligned along the X-axis direction. That is, at least one fourth conductor 16 should be 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 16 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 such that one end is connected to the feed point P ⁇ b>1 and the other end is connected to the second conductor 12 .
  • the feeding point P1 is provided in the vicinity of the first connection conductor 202 in the first conductor 10 .
  • the feeding point P1 may be provided in the vicinity of the first connection conductor 20 1 , the second connection conductor 22 1 , or the second connection conductor 22 2 in the first conductor 10 .
  • the feed conductor 24 is, for example, a columnar body extending in the Z-axis direction. As shown in FIG. 3, a clearance C is provided between the feeding point P1 and the first conductor 10. As shown in FIG. That is, the feeding point P1 is provided on the first conductor 10 with a gap therebetween.
  • the feeding conductor 24 may be configured such that one end is connected to the feeding point P ⁇ b>1 and the other end is connected to the third conductor 14 .
  • the feeding conductor 24 may be configured such that one end is connected to the feeding point P ⁇ b>1 and the other end is connected to the fourth conductor 16 . That is, the feeding conductor 24 may have one end connected to the feeding point P1 and the other end connected to any one of the second conductor 12, the third conductor 14, and the fourth conductor 16 facing the feeding point P1. .
  • the communication unit 3 is arranged inside the antenna 2.
  • the communication unit 3 is arranged on the first conductor 10 .
  • the communication unit 3 is mounted, for example, on a mounting portion (not shown) provided on the first conductor 10 .
  • the communication unit 3 may be adhered to the first conductor 10 by, for example, double-sided tape or adhesive.
  • the communication unit 3 has a structure shielded by a metal cap or the like.
  • the communication unit 3 is formed in, for example, a rectangular parallelepiped shape. In the example shown in FIG. 3, the communication unit 3 is shorter in the Y-axis direction than in the X-axis direction. In this embodiment, the communication unit 3 is described as being formed in a rectangular parallelepiped shape, but the present disclosure is not limited to this.
  • the communication unit 3 may be formed in a cubic shape, or may be formed in a cylindrical shape.
  • One end of a feeder line 5 such as a cable is connected to the communication unit 3, for example.
  • the other end of the power supply line 5 is connected to the power supply point P1. That is, the communication unit 3 is connected to the feeding point P1 via the feeding line 5 .
  • the communication unit 3 and the feeding point P1 may be connected by a feeding pattern extending from the feeding point P1 to the communication unit 3 .
  • FIG. 4 is a block diagram showing a configuration example of a communication unit according to the first embodiment
  • the communication unit 3 includes a memory 30, a controller 32, a sensor 34, and a battery 36.
  • the memory 30 may include, for example, semiconductor memory. Memory 30 may be configured to function as a work memory for controller 32 . Memory 30 may be included in controller 32 . The memory 30 stores a program describing processing details for realizing each function of the wireless communication device 1, information used in the wireless communication device 1, and the like.
  • the controller 32 may include, for example, a processor. Controller 32 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 32 may be either a SoC (System-on-a-Chip) with which one or more processors cooperate, or a SiP (System in a Package).
  • the controller 32 may store in the memory 30 various information or programs for operating each component of the wireless communication device 1 .
  • the controller 32 may be configured to generate a transmission signal to be transmitted from the wireless communication device 1. Controller 32 may be configured to obtain measurement data from sensor 34, for example. Controller 32 may be configured to generate a transmission signal responsive to the measured data. Controller 32 may be configured to transmit baseband signals to antenna 2 .
  • the sensor 34 includes various sensors.
  • the sensor 34 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 34 may include a GNSS (Global Navigation Satellite System) sensor that acquires current location information of the wireless communication device 1 .
  • GNSS Global Navigation Satellite System
  • the battery 36 may be configured to power the wireless communication device 1 .
  • Battery 36 may be configured to power at least one of memory 30 , controller 32 , and sensor 34 .
  • Battery 36 may include at least one of a primary battery and a secondary battery.
  • a negative electrode of the battery 36 may be configured to be electrically connected to a ground terminal of a circuit board (not shown).
  • FIG. 5 is a diagram showing current flow in the wireless communication device according to the first embodiment.
  • FIG. 5 shows a cross section at the same position as the II line shown in FIG.
  • FIG. 6 is a diagram showing the current flow in the top conductor of the antenna according to the first embodiment.
  • FIG. 7 is a diagram showing the current flow in the bottom conductor of the antenna according to the first embodiment.
  • the current I flows through the first conductor 10, the first connecting conductor 20, the second conductor 12, the fourth conductor 16, the third conductor 14, the second connecting conductor 22, and the first conductor 10. It flows so as to circulate in the order of
  • FIG. 8 is a diagram for explaining the flow of the magnetic field inside the antenna 2 according to the first embodiment.
  • FIG. 8 schematically shows the magnetic field flow between the first conductor 10 and the second, third and fourth conductors 12 , 14 and 16 .
  • the magnetic field M1 is a magnetic field generated by the current flowing through the first connection conductor 20-1 .
  • the magnetic field M2 is a magnetic field generated by the current flowing through the first connection conductor 202.
  • the magnetic field M1 and the magnetic field M2 are counterclockwise circular magnetic fields surrounding the first connection conductors 20-1 and 20-2 , respectively, when viewed from the top of the XY plane.
  • the magnetic field M3 is a magnetic field generated by the current flowing through the second connection conductor 22-1 .
  • the magnetic field M4 is a magnetic field generated by the current flowing through the second connection conductor 222 . Since the directions of the currents flowing through the second connection conductors 22-1 and 22-2 are the same, the directions of the magnetic field M3 and the magnetic field M4 are the same.
  • the magnetic field M3 and the magnetic field M4 are clockwise circular magnetic fields surrounding the second connection conductors 22-1 and 22-2 , respectively, when viewed from the top of the XY plane.
  • the directions of the currents flowing through the first connection conductor 20 and the second connection conductor 22 are opposite, the directions of the magnetic field M1 and the magnetic field M2 are opposite to the directions of the magnetic field M3 and the magnetic field M4.
  • the magnetic field M5 is a magnetic field generated by the current flowing through the power supply conductor 24.
  • the magnetic field M5 is a counterclockwise circular magnetic field surrounding the power supply conductor 24 when viewed from the top of the XY plane. Since the direction of the current flowing through the feed conductor 24 is the same as the direction of the current flowing through the first connection conductor 20, the directions of the magnetic field M5 and the magnetic fields M1 and M2 are the same.
  • a magnetic field M6 is a magnetic field near the center in the X-axis direction generated by currents flowing through the first conductor 10, the second conductor 12, the third conductor 14, and the fourth conductor 16.
  • the magnetic field M6 is a magnetic field parallel to the Y-axis direction in a top view of the XY plane.
  • the magnetic field M6 is a magnetic field that flows from the -Y-axis direction to the +Y-axis direction.
  • the currents flowing through the first conductor 10 and the currents flowing through the second conductor 12, the third conductor 14 and the fourth conductor 16 are opposite in direction.
  • the direction of the magnetic field generated by the current flowing through the first conductor 10 and the magnetic field generated by the current flowing through the second conductor 12, the third conductor 14, and the fourth conductor 16 are opposite.
  • the magnetic fields between the first conductor 10, the second conductor 12, the third conductor 14, and the fourth conductor 16 are in the same direction, such as in the +Y-axis direction or the -Y-axis direction.
  • the magnetic field M6 is composed of the magnetic field generated by the current flowing through the first conductor 10, the magnetic field generated by the current flowing through the second conductor 12, the third conductor 14, and the fourth conductor 16, the first connection conductor 20, and the second connection conductor 22.
  • the directions of the magnetic fields M1 to M4 between the first conductor 10, the second conductor 12, the third conductor 14, and the fourth conductor 16 are each in the +Y-axis direction.
  • the connection conductors are separated from each other, the influence of the magnetic fields M1 to M4 on the magnetic field M6 is relatively small.
  • the directions of the magnetic field M1 and the magnetic field M2 are opposite. Therefore, between the first connection conductors 20-1 and 20-2 , the magnetic field M1 and the magnetic field M2 cancel each other out, and the magnetic field is weakened.
  • the directions of the magnetic field M3 and the magnetic field M4 are opposite. Therefore, the magnetic field M3 and the magnetic field M4 cancel each other out between the second connection conductors 22-1 and 22-2 , and the magnetic field is weakened.
  • FIG. 9 is a diagram showing a simulation result of magnetic field intensity inside the antenna 2 according to the first embodiment.
  • regions with stronger magnetic field strength are shown in darker colors, and regions with weaker magnetic field strengths are shown in lighter colors.
  • areas around the first connection conductor 20 1 , the first connection conductor 20 2 , the second connection conductor 22 1 , the second connection conductor 22 2 , and the feeding conductor 24 are Inside the antenna 2, the region near the center in the longitudinal direction, which is the region where the magnetic field strength is the strongest, is the region where the magnetic field strength is relatively strong.
  • the area between the first connection conductor 20-1 and the first connection conductor 20-2 and the area between the second connection conductor 22-1 and the second connection conductor 22-2 generate a magnetic field. This is the area with the weakest intensity.
  • the location of the communication unit 3 is determined based on at least one of the magnetic field flow and the magnetic field strength inside the antenna 2 .
  • the communication unit 3 is arranged inside the antenna 2 at a position where the magnetic field strength is relatively high. Specifically, in this embodiment, the communication unit 3 is arranged near the first connection conductor 20 or the second connection conductor 22 having a relatively strong magnetic field strength.
  • FIG. 10 is a diagram for explaining a method of arranging the communication units 3 according to the first comparative example.
  • FIG. 10 is a top view of the first conductor 10.
  • the communication unit 3 is arranged in the first conductor 10 between the second connection conductor 22-1 and the second connection conductor 22-2 .
  • the communication unit 3 is connected to the first conductor 10 by the second connection conductor 22-1 and the second connection conductor 22-2 so that the longitudinal direction of the communication unit 3 and the longitudinal direction of the first conductor 10 are aligned. is placed between
  • FIG. 11 is a diagram showing the flow of the magnetic field inside the antenna 2 according to the first comparative example.
  • FIG. 11 shows a cross-sectional view taken along line AA of FIG.
  • the communication unit 3 is arranged between the second connection conductor 22-1 and the second connection conductor 22-2 .
  • a magnetic field M3 is generated around the second connection conductor 22-1 .
  • a magnetic field M4 is arranged around the second connection conductor 22-2 . Since the communication unit 3 is arranged in a region where the magnetic field is weak, almost no magnetic field flows in the space between the third conductor 14 and the communication unit 3 . That is, when the communication unit 3 is placed in an area where the magnetic field is weak because the direction of the magnetic field M3 and the direction of the magnetic field M4 are opposite to each other, the magnetic fields do not weaken each other in that area. the magnetic field becomes stronger.
  • FIG. 12 is a diagram for explaining the radiation efficiency of the antenna according to the first comparative example.
  • a graph G1 shows the total radiation efficiency of the antenna 2 when the communication unit 3 is not arranged.
  • Graph G2 shows the total radiation efficiency of the antenna 2 when the communication unit 3 is arranged in the first conductor 10 between the second connection conductor 22-1 and the second connection conductor 22-2 in the first conductor 10. .
  • the resonance frequency of the antenna 2 is about 900 MHz, as shown in graph G1.
  • the resonance frequency of the antenna 2 when arranged between the second connection conductor 22-1 and the second connection conductor 22-2 is 800 MHz or less.
  • the antenna 2 when the communication unit 3 is arranged between the second connection conductor 22-1 and the second connection conductor 22-2 has a large inductance component, so the resonance frequency is on the low frequency side. shift to That is, in the first conductor 10, when the communication unit 3 is arranged between the second connection conductor 22-1 and the second connection conductor 22-2 , the antenna when the communication unit 3 is not arranged in the first conductor 10 2 means that the radiation characteristics change.
  • FIG. 13 is a diagram for explaining a method of arranging the communication units 3 according to the second comparative example.
  • FIG. 13 is a top view of the first conductor 10.
  • the communication unit 3 is placed in the center of the first conductor 10 .
  • the longitudinal direction of the communication unit 3 and the longitudinal direction of the first conductor 10 are arranged in the central portion of the first conductor 10 .
  • FIG. 14 is a diagram showing the flow of the magnetic field inside the antenna 2 according to the second comparative example.
  • FIG. 14 shows a BB cross-sectional view of FIG.
  • the communication unit 3 is arranged in the central portion of the first conductor 10 .
  • a magnetic field M6 is generated in the central portion of the first conductor 10 .
  • a portion of the magnetic field M6 is blocked by the communication unit 3, and the remainder flows through the space between the third conductor 14 and the communication unit 3. That is, by arranging the communication unit 3 in the central portion of the first conductor 10, the magnetic field in the central portion of the first conductor 10 becomes weaker than when the communication unit 3 is not arranged.
  • FIG. 15 is a diagram for explaining the radiation efficiency of the antenna according to the second comparative example.
  • the horizontal axis indicates frequency [MHz], and the vertical axis indicates total radiation efficiency [dB].
  • a graph G1 shows the total radiation efficiency of the antenna 2 when the communication unit 3 is not arranged.
  • a graph G3 shows the total radiation efficiency of the antenna 2 when the communication unit 3 is placed in the center of the first conductor 10 so that the longitudinal direction of the communication unit 3 and the longitudinal direction of the first conductor 10 are aligned. .
  • the resonance frequency of the antenna 2 is approximately 900 MHz, as shown in the graph G1.
  • the resonance frequency of antenna 2 is 900 MHz or higher when communication unit 3 is arranged in the center of first conductor 10 . Since the antenna 2 in which the communication unit 3 is arranged in the center of the first conductor 10 has a small inductance component, the resonance frequency shifts to the high frequency side. That is, when the communication unit 3 is arranged in the central portion of the first conductor 10, the radiation characteristics are different from those of the antenna 2 when the communication unit 3 is not arranged on the first conductor 10.
  • FIG. 16 is a diagram for explaining a method of arranging the communication units 3 according to the first embodiment.
  • FIG. 16 is a top view of the first conductor 10.
  • the communication unit 3 is arranged in the vicinity of the second connection conductor 22-1 of the first conductor 10.
  • the communication unit 3 is arranged near the second connection conductor 221 of the first conductor 10 so that the longitudinal direction of the communication unit 3 and the longitudinal direction of the first conductor 10 are aligned.
  • FIG. 17 is a diagram showing the flow of the magnetic field inside the antenna 2 according to the first embodiment.
  • FIG. 17 shows a CC sectional view of FIG.
  • the communication unit 3 is arranged near the second connection conductor 22-1 .
  • a magnetic field M3 is generated around the second connection conductor 22-1 . Since the communication unit 3 is arranged near the second connection conductor 221 , the strength of the magnetic field M3 around the communication unit 3 is strong. Therefore, the magnetic field M3 flows through the space between the communication unit 3 and the third conductor 14 without being blocked by the communication unit 3 . As a result, the magnetic field M3 generated around the second connection conductor 22-1 and the magnetic field M4 generated around the second connection conductor 22-2 cancel each other out.
  • FIG. 18 is a diagram for explaining radiation efficiency of the antenna according to the first embodiment.
  • a graph G1 shows the overall radiation efficiency of the antenna 2 when the communication unit 3 is not arranged.
  • a graph G4 shows the total radiation efficiency of the antenna 2 when the communication unit 3 is arranged in the vicinity of the second connection conductor 22-1 in the first conductor 10.
  • the resonance frequency of graph G1 and the resonance frequency of graph G4 are each 900 MHz and substantially match.
  • the overall radiation efficiency at the resonance frequency of graph G1 is about -2 dB, which is good.
  • the total radiation efficiency at the resonance frequency of graph G4 is slightly lower than -2 dB, but good.
  • Graph G4 shows characteristics close to graph G1 in the band from 750 MHz to 950 MHz. That is, it can be said that the radiation characteristics of the antenna 2 in which the communication unit 3 is arranged near the second connection conductor 221 are approximately the same as the radiation characteristics of the antenna 2 in which the communication unit 3 is not arranged. That is, by arranging the communication unit 3 in the vicinity of the second connection conductor 221 in the first conductor 10, the antenna 2 and the communication unit 3 can be integrated without changing the characteristics of the antenna 2. . Thereby, the wireless communication device 1 can be miniaturized.
  • FIG. 19 is a diagram for explaining radiation efficiency of the antenna according to the first embodiment.
  • a graph G1 shows the radiation efficiency of the antenna 2 when the communication unit 3 is not arranged on the first conductor 10.
  • FIG. A graph G4 shows the radiation efficiency of the antenna 2 when the communication unit 3 is arranged in the vicinity of the second connection conductor 22-1 in the first conductor 10.
  • FIG. A graph G5 shows the radiation efficiency of the antenna 2 when the communication unit 3 is arranged in the vicinity of the second connection conductor 222 in the first conductor 10 .
  • a graph G6 shows the radiation efficiency of the antenna 2 when the first conductor 10 is arranged in the vicinity of the first connecting conductor 201.
  • FIG. In the example shown in FIG. 19, the first conductors 10 are arranged such that the longitudinal direction of the communication unit 3 and the longitudinal direction of the first conductors 10 are aligned.
  • graph G4 and graph G5 are substantially the same. That is, in the first conductor 10, when the communication unit 3 is arranged near the second connection conductor 22-1 and when the communication unit 3 is arranged near the second connection conductor 22-2 , the antenna 2 are almost identical.
  • Graph G6 has a radiation characteristic of about -2 dB at the resonance frequency. Graph G6 substantially agrees with graph G1 in radiation characteristics at the resonance frequency.
  • the radiation characteristics of the antenna 2 at the resonance frequency when the communication unit 3 is arranged near the first connection conductor 201 are as follows: almost agree with the radiation characteristics of That is, in the first conductor 10, it is preferable to arrange the communication unit 3 near the first connection conductor 20-1 rather than near the second connection conductors 22-1 and 22-2 .
  • the communication unit 3 is arranged in the vicinity of the first connection conductor 20 1 , the second connection conductor 22 1 , or the second connection conductor 22 2 in the first conductor 10. By arranging them, the antenna 2 and the communication unit 3 can be integrated.
  • the feeding point P1 and the feeding conductor 24 are provided near the first connection conductor 202 , so due to space restrictions, the communication unit 3 is placed near the first connection conductor. There is a possibility that it cannot be placed in the vicinity of 20 2 . Therefore, in the communication unit 3, the first connecting conductor 20 1 , the second connecting conductor 22 1 and the second connecting conductor 22 2 other than the first connecting conductor 20 2 provided near the feeding point P1 and the feeding conductor 24 is preferably arranged in the vicinity of any one of However, the communication unit 3 may be arranged in the vicinity of the first connection conductor 202 if the limitation of the arrangement space is eliminated by reducing the size of the communication unit 3 or the like.
  • the communication unit 3 and the feeding point P1 are connected by a feeding line 5.
  • FIG. 5 From the viewpoint of routing of the power supply line 5, rather than arranging the communication unit 3 near the second connection conductor 22-1 or the second connection conductor 22-2 , the first connection conductor 20-1 or the first connection conductor 20-2 It is preferable to arrange them in the vicinity.
  • FIG. 20 is a diagram for explaining the arrangement direction of the communication unit 3 according to the first embodiment.
  • the communication unit 3 is arranged in the vicinity of the second connection conductor 221 in the first conductor 10 so that the longitudinal direction is along the lateral direction of the first conductor 10 .
  • FIG. 21 is a diagram for explaining the arrangement direction of the communication unit and the radiation efficiency of the antenna according to the first embodiment.
  • a graph G1 shows the radiation efficiency of the antenna 2 when the communication unit 3 is not arranged on the first conductor 10.
  • FIG. Graph G4 shows the overall radiation efficiency of the antenna 2 when the communication unit 3 is arranged in the vicinity of the second connection conductor 221 in the first conductor 10 with its longitudinal direction parallel to the longitudinal direction of the first conductor 10.
  • Graph G7 shows the overall radiation efficiency of the antenna 2 when the communication unit 3 is arranged in the vicinity of the second connection conductor 221 in the first conductor 10 with the longitudinal direction parallel to the short direction of the first conductor 10. indicates
  • the The resonance frequency is 900 MHz or less.
  • the communication unit 3 is placed in the vicinity of the second connection conductor 22-1 with its longitudinal direction parallel to the width direction of the first conductor 10, the communication unit 3 is connected to the second connection conductor 22-1 and the second connection conductor 22-2 . can reach up to the region where the magnetic field weakens between Therefore, since the magnetic fields do not weaken each other in the region between the second connection conductor 22-1 and the second connection conductor 22-2 , the magnetic field is stronger than when the communication unit 3 is not arranged. That is, in the first conductor 10, the antenna 2 when the communication unit 3 is arranged between the second connection conductor 22-1 and the second connection conductor 22-2 has a large inductance component and a low resonance frequency. Shift to the frequency side.
  • the communication unit 3 is configured so that the magnetic field between the second connection conductor 22-1 and the second connection conductor 22-2 does not reach the weak region in the vicinity of the second connection conductor 22-1. is preferably placed in In the present embodiment, it is preferable that the communication unit 3 is arranged so that the short direction is parallel to the short direction of the first conductor 10 .
  • FIG. 22 is a diagram illustrating a configuration example of a wireless communication device according to the second embodiment.
  • FIG. 23 is a diagram showing a configuration example of the top conductor of the antenna according to the second embodiment.
  • FIG. 22 shows a cross-sectional view taken along line II-II in FIG. Note that the configuration of the lower surface conductor of the antenna according to the second embodiment is the same as the configuration of the first conductor 10 shown in FIG. 3, so description thereof will be omitted.
  • the wireless communication device 1A includes an antenna 2A and a communication unit 3.
  • the antenna 2A includes a first conductor 10, a second conductor 12A, a third conductor 14A, a fourth conductor 16A, a first connection conductor 20-1 , a first connection conductor 20-2 , and a second connection conductor 22-1. , a second connection conductor 222 , a feed conductor 24 and a housing 26 .
  • the second embodiment differs from the wireless communication device 1 shown in FIG. 1 in that the communication unit 3 is arranged on the second conductor 12A or the third conductor 14A among the top conductors inside the antenna 2A.
  • the communication unit 3 is arranged on the second conductor 12A.
  • the communication unit 3 is arranged near the first connection conductor 201 with its longitudinal direction parallel to the longitudinal direction of the antenna 2A.
  • the communication unit 3 may be arranged on the third conductor 14A.
  • the second conductor 12A is longer in the X-axis direction than the second conductor 12 shown in FIG. Specifically, the second conductor 12A is formed long in the X-axis direction to such an extent that the communication unit 3 can be arranged in the vicinity of the first conductor 10 so that its longitudinal direction is parallel to the longitudinal direction of the antenna 2A.
  • the third conductor 14A is longer in the X-axis direction than the third conductor 14 shown in FIG. Specifically, the third conductor 14A is formed long in the X-axis direction to such an extent that the communication unit 3 can be arranged in the vicinity of the second conductor 12 so that its longitudinal direction is parallel to the longitudinal direction of the antenna 2A.
  • the length of the second conductor 12A in the X-axis direction and the length of the third conductor 14A in the X-axis direction are the same.
  • the fourth conductor 16A is arranged on the X axis longer than the fourth conductor 16 shown in FIG. 2 by the amount that the second conductor 12A and the third conductor 14A are formed longer than the second conductor 12 and the third conductor 14 shown in FIG.
  • the length in the direction is formed short.
  • the length of the fourth conductor 16A in the X-axis direction is shorter than the lengths of the second conductor 12A and the third conductor 14A.
  • the feeding point P1 is provided on the second conductor 12A.
  • a clearance C is provided between the feeding point P1 and the second conductor 12A.
  • the feed conductor 24 has one end connected to the feed point P1 and the other end connected to the first conductor 10 . Since a clearance C is provided between the feeding point P1 and the second conductor 12A, the feeding conductor 24 and the second conductor 12A are not connected.
  • the feeding point P1 may be provided with a gap between the third conductor 14A and the fourth conductor 16A.
  • one end of the feeding conductor 24 is connected to the feeding point P1 provided to any one of the second conductor 12A, the third conductor 14A, and the fourth conductor 16A with a gap therebetween.
  • the end may be connected to the first conductor 10 facing the feed point P1.
  • FIG. 24 is a diagram for explaining the radiation efficiency of the antenna according to the second embodiment.
  • a graph G10 shows the overall radiation efficiency of the antenna 2A when the communication unit 3 is not arranged.
  • the graph G11 is for the antenna 2A when the communication unit 3 is arranged in the vicinity of the first connection conductor 201 in the first conductor 10 with its longitudinal direction parallel to the longitudinal direction of the antenna 2A. Shows radiation efficiency.
  • the feeding point P1 is provided on the first conductor 10 with a clearance C therebetween.
  • the feeding point P1 is once connected to the feeding point P1, and the other end is connected to the second conductor 12A facing the feeding point P1.
  • a graph G12 shows the radiation efficiency of the antenna 2A when the communication unit 3 is arranged in the vicinity of the first connection conductor 201 in the second conductor 12A with the longitudinal direction parallel to the longitudinal direction of the antenna 2A.
  • the resonance frequency of antenna 2A when communication unit 3 is not arranged is approximately 850 MHz.
  • the overall radiation efficiency at the resonance frequency of graph G10 is about -3 dB, which is good.
  • the resonance frequency of the antenna 2A when the communication unit 3 is arranged near the first connection conductor 201 with its longitudinal direction parallel to the longitudinal direction of the antenna 2A is It is about 850MHz.
  • the overall radiation efficiency at the resonance frequency of graph G11 is about -3 dB, which is good.
  • the resonance frequency of the antenna 2A when the communication unit 3 is arranged near the first connection conductor 201 with its longitudinal direction parallel to the longitudinal direction of the antenna 2A is It is about 850MHz.
  • the overall radiation efficiency at the resonance frequency of graph G12 is about -3 dB, which is good.
  • the resonance frequencies and the radiation characteristics at the resonance frequencies of the graphs G11 and G12 substantially match the resonance frequencies and the radiation characteristics at the resonance frequencies of the graph G10. Also, the resonance frequencies of the graphs G11 and G12 substantially match the resonance frequency of the graph G10.
  • the radiation characteristics of graphs G11 and G12 are substantially the same in the range from 700 MHz to 950 MHz. That is, the radiation characteristics in the range from 700 MHz to 950 MHz substantially match when the communication unit 3 is arranged on the first conductor 10 and when arranged on the second conductor 12A. That is, therefore, in the second embodiment, the communication unit 3 can be arranged on any one of the first conductor 10, the second conductor 12A, and the third conductor 14A.
  • the communication unit 3 may be arranged on the second conductor 12A or may be arranged on the third conductor 14A. From the viewpoint of routing of the power supply line 5, it is preferable to arrange the second conductor 12A or the third conductor 14A closer to the power supply point P1. In the example shown in FIGS. 22 and 23, the communication unit 3 is preferably arranged on the second conductor 12A.
  • the second embodiment has been described assuming that the communication unit 3 is mounted on the second conductor 12A or the third conductor 14A.
  • the lower surface conductor may be formed of a single sheet metal or the like.
  • FIG. 26 is a diagram showing a configuration example of a bottom conductor according to a modification of the second embodiment.
  • the lower surface conductor 40 includes a first conductor 10A, a first connection conductor 20A- 1 , a first connection conductor 20A- 2 , a second connection conductor 22A- 1 , a second connection conductor 22A- 2 , and a feed conductor 24A.
  • the lower surface conductor 40 includes the first conductor 10A, the first connection conductor 20A- 1 , the first connection conductor 20A- 2 , the second connection conductor 22A- 1 , the second connection conductor 22A- 2 , and the feed conductor 24 integrated together. It is formed sheet metal.
  • the first connection conductor 20A- 1 and the first connection conductor 20A- 2 are bent in the X-axis direction so as to be parallel to the Z-axis direction, thereby connecting the first conductor 10A and a second conductor (not shown). It is configured to
  • the second connection conductor 22A 1 , the second connection conductor 22A 2 , and the feed conductor 24A are bent in the ⁇ X-axis direction so as to be parallel to the Z-axis direction, thereby connecting the first conductor 10A and the It becomes the structure which connects with a 4th conductor.
  • a first conductor 10A, a first connection conductor 20A -1 , a first connection conductor 20A- 2 , a second connection conductor 22A- 1 , a second connection conductor 22A- 2 , and a feed conductor 24A are connected.
  • the integration makes it easier to manufacture the antenna 2A shown in FIG. The manufacturing cost of the antenna 2A can be suppressed.
  • the antenna 2 according to the first embodiment and the antenna 2A according to the second embodiment may be mounted on various structures.
  • structures include containers and pallets used for transportation of various goods.
  • the antenna 2 or the antenna 2A transmits/receives various kinds of information about the articles housed in the container to/from the server device or the like.
  • the structure may be, for example, a delivery box that houses deliveries.
  • 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.

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EP22911380.8A EP4456332A1 (en) 2021-12-24 2022-12-22 Wireless communication device and structure
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US18/723,077 US20250062540A1 (en) 2021-12-24 2022-12-22 Wireless communication apparatus and structure

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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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0983240A (ja) 1995-09-12 1997-03-28 Toshiba Corp 通信モジュール
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
WO2020262404A1 (ja) * 2019-06-25 2020-12-30 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
JP2021087062A (ja) * 2019-11-26 2021-06-03 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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0983240A (ja) 1995-09-12 1997-03-28 Toshiba Corp 通信モジュール
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
WO2020262404A1 (ja) * 2019-06-25 2020-12-30 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
JP2021087062A (ja) * 2019-11-26 2021-06-03 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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