WO2018066640A1 - Vehicle antenna and vehicle-mounted device - Google Patents

Vehicle antenna and vehicle-mounted device Download PDF

Info

Publication number
WO2018066640A1
WO2018066640A1 PCT/JP2017/036251 JP2017036251W WO2018066640A1 WO 2018066640 A1 WO2018066640 A1 WO 2018066640A1 JP 2017036251 W JP2017036251 W JP 2017036251W WO 2018066640 A1 WO2018066640 A1 WO 2018066640A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
vehicle
antenna element
dielectric
contact
Prior art date
Application number
PCT/JP2017/036251
Other languages
French (fr)
Japanese (ja)
Inventor
則親 大見
黒田　昌利
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2018066640A1 publication Critical patent/WO2018066640A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • 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 invention relates to a vehicle antenna and an in-vehicle device.
  • This application claims priority based on Japanese Patent Application No. 2016-198499 filed on Oct. 6, 2016, and incorporates all the contents described in the Japanese application.
  • a vehicle communication system that locks and unlocks a vehicle door without using a mechanical key has been put into practical use.
  • a keyless entry system that locks or unlocks a vehicle door by wireless remote control using a portable device possessed by the user, a user who possesses the portable device only approaches the vehicle or holds the door handle Smart entry (registered trademark) system for unlocking vehicle doors has been put into practical use.
  • a vehicle communication system that starts a vehicle engine without using a mechanical key has been put into practical use.
  • a smart start (registered trademark) system that starts an engine simply by a user holding a portable device pressing an engine start switch has been put into practical use.
  • the above vehicle communication system includes an in-vehicle device that receives a signal transmitted wirelessly from a portable device, and the in-vehicle device is provided with a vehicle antenna and a reception circuit for receiving a signal transmitted from the portable device.
  • a vehicle antenna needs to have a certain length in order to obtain a required gain, but it is difficult to form an antenna pattern having a sufficient length on a substrate.
  • Patent Document 1 discloses a technique in which a vehicle antenna having one end connected to a substrate is buried in a lid of a housing of an in-vehicle device.
  • the vehicle antenna according to this aspect includes a linear or belt-like first antenna element that performs power feeding or power reception related to radio wave transmission or reception, and a linear or belt-like second antenna element connected to the first antenna element. And a housing for housing the first and second antenna elements, wherein at least the second antenna element is in contact with the housing, and the housing includes the first antenna element and A high dielectric constant first dielectric that is in contact with the portion on the tip side of the element portion extending from the connection portion of the second antenna element and the tip portion of the second antenna element farthest from the connection portion And a second dielectric having a low dielectric constant that is in contact with the portion on the connection portion side.
  • the in-vehicle device includes the vehicle antenna and a reception unit that receives a signal transmitted from an external transmitter using the vehicle antenna.
  • the present application can be realized not only as a vehicular antenna having such a characteristic configuration, but also as a vehicle antenna manufacturing method that enables such a characteristic configuration. It can be realized as a program to be executed by a computer. Moreover, it can implement
  • FIG. 1 is a schematic diagram showing a vehicle communication system according to an embodiment of the present invention. It is a block diagram which shows the example of 1 structure of the vehicle equipment which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a side sectional view showing a configuration example of a vehicle antenna and an in-vehicle device according to an embodiment of the present invention. It is a graph which shows the relationship between the contact length of a 1st dielectric material and a 2nd antenna element, and the gain of a vehicle antenna. It is a sectional side view which shows one structural example of the vehicle antenna and vehicle equipment which concern on a modification.
  • An object of the present disclosure is to provide a vehicle antenna and a vehicle-mounted device that can reduce the size of an antenna element and increase the communication distance.
  • a vehicle antenna includes a linear or belt-like first antenna element that performs power feeding or power reception related to transmission or reception of radio waves, and a linear or belt-like first antenna element connected to the first antenna element.
  • a vehicle antenna comprising two antenna elements and a housing for housing the first and second antenna elements, wherein at least the second antenna element is in contact with the housing, and the housing is a first antenna Among the element portions extending from the connection portion of the antenna element and the second antenna element and the distal end portion of the second antenna element farthest from the connection portion, the high dielectric constant first contacting the portion on the distal end portion side. 1 dielectric, and a low dielectric constant second dielectric that is in contact with the connecting portion side portion.
  • the vehicle antenna can be reduced in size by the wavelength shortening effect by bringing the first antenna having a high dielectric constant into contact with the second antenna element.
  • a first dielectric material having a high dielectric constant is brought into contact with a portion on the tip end side of the second antenna element, and a second dielectric material having a low dielectric constant is brought into contact with a portion on the connection portion side of the first and second antenna elements.
  • the second antenna element is buried in the first and second dielectrics.
  • the vibration resistance of the vehicle antenna can be further improved.
  • the vehicle-mounted device includes the vehicle antenna according to aspect (1) or aspect (2), and a reception unit that receives a signal transmitted from an external transmitter using the vehicle antenna.
  • the antenna element can be reduced in size and the communication distance can be increased as in the case (1).
  • FIG. 1 is a schematic diagram showing a vehicle communication system according to an embodiment of the present invention.
  • the vehicle communication system according to the present embodiment includes an in-vehicle device 1 that transmits and receives various signals using the LF transmission antennas 2 provided in a plurality of locations of the vehicle C and the vehicle antenna 11 according to the present embodiment, and the in-vehicle device. 1 and a portable device 3 that transmits and receives the signal to and from 1.
  • the plurality of LF transmitting antennas 2 are arranged, for example, at the driver side pillar, the passenger side pillar, and the front and rear portions of the vehicle.
  • FIG. 2 is a block diagram showing a configuration example of the in-vehicle device 1 according to the embodiment of the present invention.
  • the vehicle-mounted device 1 detects the position of the portable device 3 by performing wireless communication with the portable device 3, and performs keyless entry control for controlling the locking and unlocking of the vehicle door according to the detected position of the portable device 3. It has a function.
  • the in-vehicle device 1 includes a control unit 12 that controls the operation of each component of the own device.
  • the control unit 12 is a microcomputer having, for example, one or a plurality of CPUs (Central Processing Unit), a multi-core CPU, and the like.
  • the control unit 12 is provided with a transmission unit 13 and a reception unit 14.
  • the transmission unit 13 is connected to a plurality of LF transmission antennas 2, and a position detection signal for detecting the position of the portable device 3 according to the control of the control unit 12, using radio waves in the LF (Low Frequency) band. Send. For example, when a signal indicating that a request switch for a vehicle door has been operated is input to the control unit 12, the transmission unit 13 transmits a position detection signal. As a carrier wave for the position detection signal, an LF band of 30 kHz to 300 kHz is used, but it is not limited to this frequency band. The strength of the signal transmitted from each LF transmission antenna 2 is set so that the portable device 3 can receive signals from two or more LF transmission antennas 2.
  • the portable device 3 receives the position detection signals transmitted from the plurality of LF transmission antennas 2 and detects the received signal strength of each position detection signal. Then, the portable device 3 transmits a response signal including the received signal strength of each position detection signal obtained by the detection to the in-vehicle device 1 using radio waves in the UHF (Ultra High Frequency) band.
  • the carrier wave uses a UHF band of 300 MHz to 3 GHz, but is not limited to this frequency band.
  • the receiving unit 14 is connected to the vehicle antenna 11, receives various response signals transmitted from the portable device 3 using radio waves in the UHF band, and outputs the response signals to the control unit 12.
  • the control unit 12 specifies the position of the portable device 3 based on the received signal strength included in the response signal. Since the received signal strength of the position detection signal transmitted from each LF transmission antenna 2 is information corresponding to the distance between each LF transmission antenna 2 and the portable device 3, the received signal strength is used to It is possible to specify the position of the portable device 3 with respect to C.
  • the control unit 12 outputs a locking / unlocking signal for instructing locking / unlocking of the vehicle door to a door locking device (not shown).
  • the door locking device includes a locking mechanism that locks and unlocks each door and an actuator that drives the locking mechanism, and locks and unlocks the vehicle door according to a locking and unlocking signal.
  • FIG. 3 is a side sectional view showing a configuration example of the vehicle antenna 11 and the in-vehicle device 1 according to the embodiment of the present invention.
  • the in-vehicle device 1 includes a resin or ceramic substrate 10 having a ground layer, and a receiving unit 14 and a vehicle antenna 11 are disposed on the substrate 10.
  • the substrate 10 on which the vehicle antenna 11 is arranged is accommodated in a container 15.
  • the vehicle antenna 11 is, for example, an inverted L-type monopole antenna, and includes a linear first antenna element 11a that receives power related to reception of a radio wave, and a linear first antenna element 11a connected to the first antenna element 11a. 2 antenna elements 11b.
  • the first and second antenna elements 11a and 11b are formed by bending a linear antenna member made of, for example, a conductive metal such as copper or brass, an alloy, or the like.
  • the first and second antenna elements 11a and 11b according to this embodiment are linear with a circular cross section, but the cross sectional shape is not particularly limited, and may be a prismatic shape or a belt shape. May be.
  • a male terminal 11e for connecting the first antenna element 11a to the substrate 10 is formed at one end of the first antenna element 11a.
  • the board 10 is provided with a female terminal 18 into which a male terminal 11 e is inserted and electrically connected.
  • the female terminal 18 is connected to the receiving unit 14 via a conductor 19.
  • the male terminal 11e is inserted into the female terminal 18, the first antenna element 11a is connected to the substrate 10 in a posture in which the first antenna element 11a is substantially perpendicular to the substrate 10, and the first antenna element 11a is a conductor. 19 is connected to the receiving unit 14 through 19.
  • the other end of the first antenna element 11a is electrically connected to one end of the second antenna element 11b.
  • the second antenna element 11 b is substantially parallel to the substrate 10.
  • connection portion 11c a portion where the other end portion of the first antenna element 11a and one end portion of the second antenna element 11b are electrically connected is referred to as a connection portion 11c, and the connection portion of the end portions of the second antenna element 11b.
  • An end portion farthest from 11c is referred to as a tip portion 11d.
  • the container 15 has a hollow substantially rectangular parallelepiped shape, and includes a bottom plate portion 16 on which the substrate 10 is disposed and a lid portion 17 that covers the bottom plate portion 16.
  • the lid portion 17 has a rectangular top plate portion and a side wall portion formed around the top plate portion. A part of the top plate portion is formed by a first dielectric 17a having a high dielectric constant, and the other portion and the side wall portion of the top plate portion are formed by a second dielectric 17b having a low dielectric constant.
  • the tip side portion of the second antenna element 11b is in contact with and buried in the first dielectric 17a.
  • the connection antenna 11c side portion of the second antenna element 11b is in contact with and buried in the second dielectric 17b.
  • the lid portion 17 having the first dielectric 17a and the second dielectric 17b can be formed by two-color injection molding.
  • the contact length of the second antenna element 11b with the second dielectric 17b in the longitudinal direction is not more than one half of the distance between the connection portion 11c and the tip portion 11d.
  • the contact length of the second antenna element 11b with the second dielectric 17b is preferably 20% or more and 36% or less of the distance between the connection portion 11c and the tip portion 11d. More preferably, the contact length is preferably about 27% to 36% of the distance between the connection portion 11c and the tip portion 11d. More preferably, the contact length is preferably about 27% of the distance between the connecting portion 11c and the tip portion 11d.
  • the first dielectric 17a is a dielectric composite material containing a synthetic resin and ceramic powder, and the relative dielectric constant thereof is preferably 5 or more (for example, International Publication No. WO2010 / 027074).
  • the second dielectric 17b is, for example, air.
  • a thermosetting resin such as an epoxy resin or a thermosetting polyimide resin can be used, but it is thermoplastic in that it can be melt-molded such as injection molding. It is preferable to use a resin.
  • thermoplastic resin examples include polyolefin resins such as polyethylene (low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ultra low density polyethylene), and polypropylene; polystyrene, syndiotactic polystyrene, modified polystyrene, and the like. Polystyrene resin; polyphenylene oxide resin; polyphenylene sulfide resin and the like are preferable.
  • thermoplastic resins include liquid crystal polymer, ABS resin, thermoplastic polyester resin, polyacetal resin, polyamide resin, methylpentene resin, cyclic olefin resin, polycarbonate resin, hot melt fluororesin, thermoplastic polyimide resin, poly Examples include ether imide resins. These synthetic resins can be used alone or in combination of two or more.
  • the ceramic powder is a powder made of titanium oxide or titanate.
  • titanate what shows high dielectric properties, such as calcium titanate, barium titanate, strontium titanate, magnesium titanate, lead titanate, calcium magnesium titanate, neodymium titanate, is preferable, for example.
  • titanium oxide powder, calcium titanate powder, and strontium titanate powder are preferable, and a dielectric composite material that is easy to synthesize, has a low specific gravity, and exhibits a high relative dielectric constant and a low dielectric loss tangent.
  • Calcium titanate powder is particularly preferable because it is easy to obtain.
  • FIG. 4 is a graph showing the relationship between the contact length between the first dielectric 17 a and the second antenna element 11 b and the gain of the vehicle antenna 11.
  • the horizontal axis represents the contact length between the first dielectric 17a and the second antenna element 11b
  • the left vertical axis represents the gain associated with reception of radio waves in the vertical plane with respect to the substrate 10
  • the right vertical axis represents the substrate.
  • 10 shows gain related to reception of radio waves in a horizontal plane with respect to 10.
  • the plot shown in the graph of FIG. 4 is obtained under the following experimental conditions, the rhombus plot indicates the gain in the vertical plane, and the rectangular plot indicates the gain in the horizontal plane.
  • the first antenna element 11a used in the experiment is a rod-shaped element having a length of 18 mm and a diameter of 2 mm
  • the second antenna element 11b is a rod-shaped element having a length of 90 mm and a diameter of 2 mm.
  • the first dielectric 17a is a member having a relative dielectric constant of 28 and a dielectric loss tangent of 0.002.
  • the first dielectric 17a has a substantially rectangular parallelepiped shape, a thickness of 5 mm, and a length in a direction perpendicular to the substrate 10 is 17 mm.
  • the contact portion between the first dielectric 17a and the second antenna element 11b is 50 in the longitudinal direction of the second antenna element 11b rather than the entire longitudinal direction of the second antenna element 11b. It can be seen that the gain is higher when the contact is made in the region of% or less. In addition, the shorter the length of the contact portion between the first dielectric 17a and the second antenna element 11b is, of course, not better, and the gain in the vertical plane with respect to the substrate 10 is the contact length of the second antenna element. It can be seen that a high gain can be obtained by setting it to 20% or more of the total length of 11b.
  • the contact length is set to 27% or more and 36% or less of the entire length of the second antenna element 11b, it can be seen that both the gain in the vertical plane and the gain in the horizontal plane are increased. Furthermore, when the contact length is set to approximately 27% of the entire length of the second antenna element 11b, it can be seen that both the gain in the vertical plane relative to the substrate 10 and the gain in the horizontal plane are maximized.
  • the vehicular antenna 11 can be downsized by the wavelength shortening effect caused by bringing the first dielectric 17a having a high dielectric constant into contact with the second antenna element 11b. can do.
  • the first dielectric 17a is in contact with a part of the second antenna element 11b.
  • the gain of the vehicle antenna 11 can be maintained without increasing the size of the vehicle antenna 11. confirmed.
  • the vehicular antenna 11 housed inside a casing of an ECU (Electronic Control Unit) there is a dimensional limitation, but the size requirement can be satisfied by downsizing the vehicular antenna 11.
  • the size requirement can be met by downsizing the vehicle antenna 11. .
  • the first dielectric 17a having a high dielectric constant is brought into contact with the front end portion of the second antenna element 11b, and the second dielectric 17b having a low dielectric constant is brought into contact with the connecting portion side portion.
  • the communication distance using the vehicle antenna 11 can be increased.
  • the vibration resistance of the vehicle antenna 11 can be further improved by burying the second antenna element 11b in the first dielectric 17a and the second dielectric 17b of the lid portion 17.
  • the vehicle antenna 11 and the vehicle-mounted device 1 can be reduced in weight and cost.
  • the first dielectric 17a is made of a dielectric composite material containing a synthetic resin and a ceramic powder, so that the second dielectric can be easily damaged with high dielectric constant using injection molding or the like. 17b can be manufactured. Accordingly, it is possible to reduce the manufacturing costs related to the vehicle antenna 11 and the vehicle-mounted device 1.
  • the vehicle-mounted device 1 that detects the position of the portable device 3 has been described as an application example of the vehicle antenna 11.
  • the vehicle-mounted device 1 is an example, and is transmitted from a tire pressure sensor provided on each tire of the vehicle C.
  • TPMS Tire Pressure Monitoring System
  • ITS Intelligent road transport systems
  • RES remote engine start
  • the present invention can be applied to any other in-vehicle communication device such as for a remote engine starter system.
  • the vehicle antenna 11 may be a reception-only or transmission-only antenna, or a transmission / reception antenna. Note that when the vehicle antenna 11 is used as a transmission antenna, the first antenna element 11a functions as an antenna element to which power supply related to transmission of radio waves is performed.
  • the inverted L-type antenna has been described as an example.
  • the vehicle antenna 11 has a linear or belt-like antenna element, such as an inverted F-type antenna or an inverted U-shaped antenna, the shape is There is no particular limitation.
  • the location where the first antenna element 11a is buried and the location where the second dielectric 17b is formed in the container 15 are not particularly limited, and various modifications are possible.
  • the second antenna element 11b may be buried in the lid portion 17 so that the tip side portion of the second antenna element 11b reaches the side wall portion of the lid portion 17, and the side wall portion may be formed of the second dielectric 17b. good.
  • FIG. 5 is a side sectional view showing a configuration example of the vehicle antenna 11 and the vehicle-mounted device 101 according to a modification.
  • the vehicular antenna 11 according to the first modification is not buried in the lid portion 17 of the container 15, and the tip side portion of the second antenna element 11 b contacts the first dielectric 17 a of the lid portion 17.
  • the other part of the second antenna element 11b is in contact with the second dielectric 17b.

Abstract

A vehicle antenna comprises: a first antenna element that is line-shaped or strip-shaped and used for power feeding or reception related to transmission or reception of radio waves; a second antenna element that is line-shaped or strip-shaped and connected to the first antenna element; and a housing that houses the first and second antenna elements. At least the second antenna element is in contact with the housing, and the housing comprises: a first dielectric material having a high dielectric constant and being in contact with a portion, of an element portion extending from a junction of the first antenna element and the second antenna element to a distal end of the second antenna element that is the farthest from the junction, on the distal end side; and a second dielectric material having a low dielectric constant and being in contact with a portion on the junction side.

Description

車両用アンテナ及び車載機Vehicle antenna and in-vehicle device
　本発明は、車両用アンテナ及び車載機に関する。
　本出願は、２０１６年１０月６日出願の日本出願第２０１６－１９８４９９号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。 The present invention relates to a vehicle antenna and an in-vehicle device.
This application claims priority based on Japanese Patent Application No. 2016-198499 filed on Oct. 6, 2016, and incorporates all the contents described in the Japanese application.
　メカニカルキーを用いずに車両ドアの施錠及び解錠を行う車両用通信システムが実用化されている。具体的には、使用者が所持する携帯機を用いた無線遠隔操作により車両ドアの施錠又は解錠を行うキーレスエントリシステム、携帯機を所持した使用者が車両に近づき、又はドアハンドルを握るだけで車両ドアの解錠を行うスマートエントリ（登録商標）システム等が実用化されている。
　また、メカニカルキーを用いずに車両のエンジン始動を行う車両用通信システムも実用化されている。具体的には、携帯機を所持した使用者がエンジンスタートスイッチを押すだけでエンジンの始動を行うスマートスタート（登録商標）システムが実用化されている。 A vehicle communication system that locks and unlocks a vehicle door without using a mechanical key has been put into practical use. Specifically, a keyless entry system that locks or unlocks a vehicle door by wireless remote control using a portable device possessed by the user, a user who possesses the portable device only approaches the vehicle or holds the door handle Smart entry (registered trademark) system for unlocking vehicle doors has been put into practical use.
Further, a vehicle communication system that starts a vehicle engine without using a mechanical key has been put into practical use. Specifically, a smart start (registered trademark) system that starts an engine simply by a user holding a portable device pressing an engine start switch has been put into practical use.
　以上の車両用通信システムは、携帯機から無線送信される信号を受信する車載機を備え、車載機には携帯機から送信された信号を受信するための車両用アンテナ及び受信回路が設けられている。また、近年、各種ＥＣＵが有する機能が統合され、当該車載機の基板には、所狭しと各種回路及び車両用アンテナが搭載される状況にある。車両用アンテナは、所要の利得を得るために一定の長さを有する必要があるが、基板上に十分な長さのアンテナパターンを形成することが困難である。 The above vehicle communication system includes an in-vehicle device that receives a signal transmitted wirelessly from a portable device, and the in-vehicle device is provided with a vehicle antenna and a reception circuit for receiving a signal transmitted from the portable device. Yes. In recent years, functions of various ECUs are integrated, and various circuits and vehicle antennas are mounted on the board of the in-vehicle device. A vehicle antenna needs to have a certain length in order to obtain a required gain, but it is difficult to form an antenna pattern having a sufficient length on a substrate.
　この問題を解決する技術として、特許文献１には、基板に一端部が接続された車両用アンテナを車載機の収容体の蓋に埋没させる技術が開示されている。 As a technique for solving this problem, Patent Document 1 discloses a technique in which a vehicle antenna having one end connected to a substrate is buried in a lid of a housing of an in-vehicle device.
特開２００９－６０３７４号公報JP 2009-60374 A
　本態様に係る車両用アンテナは、電波の送信又は受信に係る給電又は受電が行われる線状又は帯状の第１アンテナエレメントと、第１アンテナエレメントに接続された線状又は帯状の第２アンテナエレメントと、第１及び第２アンテナエレメントを収容する収容体とを備えた車両用アンテナであって、少なくとも第２アンテナエレメントは前記収容体に接触しており、前記収容体は、第１アンテナエレメント及び第２アンテナエレメントの接続部と、該接続部から最遠の第２アンテナエレメントの先端部とに亘るエレメント部分の内、前記先端部側の部分に接触している高誘電率の第１誘電体と、前記接続部側の部分に接触している低誘電率の第２誘電体とを有する。 The vehicle antenna according to this aspect includes a linear or belt-like first antenna element that performs power feeding or power reception related to radio wave transmission or reception, and a linear or belt-like second antenna element connected to the first antenna element. And a housing for housing the first and second antenna elements, wherein at least the second antenna element is in contact with the housing, and the housing includes the first antenna element and A high dielectric constant first dielectric that is in contact with the portion on the tip side of the element portion extending from the connection portion of the second antenna element and the tip portion of the second antenna element farthest from the connection portion And a second dielectric having a low dielectric constant that is in contact with the portion on the connection portion side.
　本態様に係る車載機は、前記車両用アンテナと、外部の送信機から送信された信号を前記車両用アンテナにて受信する受信部とを備える。 The in-vehicle device according to this aspect includes the vehicle antenna and a reception unit that receives a signal transmitted from an external transmitter using the vehicle antenna.
　なお、本願は、このような特徴的な構成を備える車両用アンテナとして実現することができるだけでなく、かかる特徴的な構成を可能にする車両アンテナ製造方法として実現したり、かかる車両アンテナ製造方法をコンピュータに実行させるためのプログラムとして実現したりすることができる。また、車両用アンテナ及び車載機の一部又は全部を実現する半導体集積回路として実現したり、車両用アンテナ及び車載機を含むその他のシステムとして実現したりすることができる。 The present application can be realized not only as a vehicular antenna having such a characteristic configuration, but also as a vehicle antenna manufacturing method that enables such a characteristic configuration. It can be realized as a program to be executed by a computer. Moreover, it can implement | achieve as a semiconductor integrated circuit which implement | achieves a part or all of a vehicle antenna and vehicle equipment, and can implement | achieve as another system containing a vehicle antenna and vehicle equipment.
本発明の実施形態に係る車両用通信システムを示す模式図である。1 is a schematic diagram showing a vehicle communication system according to an embodiment of the present invention. 本発明の実施形態に係る車載機の一構成例を示すブロック図である。It is a block diagram which shows the example of 1 structure of the vehicle equipment which concerns on embodiment of this invention. 本発明の実施形態に係る車両用アンテナ及び車載機の一構成例を示す側断面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing a configuration example of a vehicle antenna and an in-vehicle device according to an embodiment of the present invention. 第１誘電体及び第２アンテナエレメントの接触長と、車両用アンテナの利得との関係を示すグラフである。It is a graph which shows the relationship between the contact length of a 1st dielectric material and a 2nd antenna element, and the gain of a vehicle antenna. 変形例に係る車両用アンテナ及び車載機の一構成例を示す側断面図である。It is a sectional side view which shows one structural example of the vehicle antenna and vehicle equipment which concern on a modification.
［本開示が解決しようとする課題］
　車両用アンテナの小型化に相反する要求として、車両用アンテナに係る通信距離の更なる長距離化が求められている。また、その他の用途の車両用アンテナも同様の課題を有する。本願発明者等は、かかる問題を解決すべく鋭意検討した結果、車両用アンテナを構成する線状又は帯状のエレメントの先端部分を高誘電率の誘電体に接触させ、非先端部分を低誘電率の誘電体に接触させることによって、車両用アンテナの利得が向上するという知見を得た。
　本開示の目的は、アンテナエレメントの小型化及び通信距離の長距離化が可能な車両用アンテナ及び車載機を提供することにある。 [Problems to be solved by the present disclosure]
As a request contrary to the miniaturization of the vehicle antenna, further increase in the communication distance related to the vehicle antenna is required. In addition, vehicle antennas for other uses have similar problems. As a result of intensive studies to solve such problems, the inventors of the present application have contacted the tip portion of the linear or belt-like element constituting the vehicle antenna with a dielectric having a high dielectric constant, and the non-tip portion has a low dielectric constant. It has been found that the gain of the vehicle antenna is improved by contacting with the dielectric.
An object of the present disclosure is to provide a vehicle antenna and a vehicle-mounted device that can reduce the size of an antenna element and increase the communication distance.
［本開示の効果］
　本開示によれば、アンテナエレメントの小型化及び通信距離の長距離化が可能な車両用アンテナ及び車載機を提供することが可能となる。 [Effects of the present disclosure]
According to the present disclosure, it is possible to provide a vehicle antenna and a vehicle-mounted device that can reduce the size of the antenna element and increase the communication distance.
［本願の実施形態の説明］
　最初に本発明の実施態様を列記して説明する。また、以下に記載する実施形態の少なくとも一部を任意に組み合わせてもよい。 [Description of Embodiment of the Present Application]
First, embodiments of the present invention will be listed and described. Moreover, you may combine arbitrarily at least one part of embodiment described below.
（１）本態様に係る車両用アンテナは、電波の送信又は受信に係る給電又は受電が行われる線状又は帯状の第１アンテナエレメントと、第１アンテナエレメントに接続された線状又は帯状の第２アンテナエレメントと、第１及び第２アンテナエレメントを収容する収容体とを備えた車両用アンテナであって、少なくとも第２アンテナエレメントは前記収容体に接触しており、前記収容体は、第１アンテナエレメント及び第２アンテナエレメントの接続部と、該接続部から最遠の第２アンテナエレメントの先端部とに亘るエレメント部分の内、前記先端部側の部分に接触している高誘電率の第１誘電体と、前記接続部側の部分に接触している低誘電率の第２誘電体とを有する。 (1) A vehicle antenna according to this aspect includes a linear or belt-like first antenna element that performs power feeding or power reception related to transmission or reception of radio waves, and a linear or belt-like first antenna element connected to the first antenna element. A vehicle antenna comprising two antenna elements and a housing for housing the first and second antenna elements, wherein at least the second antenna element is in contact with the housing, and the housing is a first antenna Among the element portions extending from the connection portion of the antenna element and the second antenna element and the distal end portion of the second antenna element farthest from the connection portion, the high dielectric constant first contacting the portion on the distal end portion side. 1 dielectric, and a low dielectric constant second dielectric that is in contact with the connecting portion side portion.
　本願にあっては、第２アンテナエレメントに高誘電率の第１誘電体を接触させることによる波長短縮効果によって、車両用アンテナを小型化することができる。また、第２アンテナエレメントの先端部側の部分に高誘電率の第１誘電体を接触させ、第１及び第２アンテナエレメントの接続部側の部分に低誘電率の第２誘電体を接触させることによって、車両用アンテナの利得を向上させることができ、車両用アンテナを用いた通信距離の長距離化が可能になる。 In the present application, the vehicle antenna can be reduced in size by the wavelength shortening effect by bringing the first antenna having a high dielectric constant into contact with the second antenna element. In addition, a first dielectric material having a high dielectric constant is brought into contact with a portion on the tip end side of the second antenna element, and a second dielectric material having a low dielectric constant is brought into contact with a portion on the connection portion side of the first and second antenna elements. Thus, the gain of the vehicle antenna can be improved, and the communication distance using the vehicle antenna can be increased.
（２）前記第２アンテナエレメントは第１及び第２誘電体に埋没している構成が好ましい。 (2) Preferably, the second antenna element is buried in the first and second dielectrics.
　本願にあっては、第２アンテナエレメントは、第１及び第２誘電体に埋没しているため、車両用アンテナの耐振動性をより向上させることができる。 In the present application, since the second antenna element is buried in the first and second dielectrics, the vibration resistance of the vehicle antenna can be further improved.
（３）本態様に係る車載機は、態様（１）又は態様（２）の車両用アンテナと、外部の送信機から送信された信号を前記車両用アンテナにて受信する受信部とを備える。 (3) The vehicle-mounted device according to this aspect includes the vehicle antenna according to aspect (1) or aspect (2), and a reception unit that receives a signal transmitted from an external transmitter using the vehicle antenna.
　本願にあっては、態様（１）と同様、アンテナエレメントの小型化及び通信距離の長距離化が可能である。 In the present application, the antenna element can be reduced in size and the communication distance can be increased as in the case (1).
［本発明の実施形態の詳細］
　本発明の実施形態に係る車両用アンテナ及び車載機の具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 [Details of the embodiment of the present invention]
Specific examples of the vehicle antenna and the in-vehicle device according to the embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.
（実施形態１）
　図１は、本発明の実施形態に係る車両用通信システムを示す模式図である。本実施形態に係る車両用通信システムは、車両Ｃの複数箇所に設けられたＬＦ送信アンテナ２及び本実施形態に係る車両用アンテナ１１を用いて各種信号を送受信する車載機１と、該車載機１との間で該信号を送受信する携帯機３とを備える。複数のＬＦ送信アンテナ２は、例えば、運転席側のピラー、助手席側のピラー、車内の前後部に配されている。 (Embodiment 1)
FIG. 1 is a schematic diagram showing a vehicle communication system according to an embodiment of the present invention. The vehicle communication system according to the present embodiment includes an in-vehicle device 1 that transmits and receives various signals using the LF transmission antennas 2 provided in a plurality of locations of the vehicle C and the vehicle antenna 11 according to the present embodiment, and the in-vehicle device. 1 and a portable device 3 that transmits and receives the signal to and from 1. The plurality of LF transmitting antennas 2 are arranged, for example, at the driver side pillar, the passenger side pillar, and the front and rear portions of the vehicle.
　図２は、本発明の実施形態に係る車載機１の一構成例を示すブロック図である。車載機１は、携帯機３との間で無線通信を行うことにより、携帯機３の位置を検出し、検出された携帯機３の位置に応じて車両ドアの施解錠制御を行うキーレスエントリの機能を有する。具体的には、車載機１は、自機の各構成部の動作を制御する制御部１２を備える。制御部１２は、例えば一又は複数のＣＰＵ（Central Processing Unit）、マルチコアＣＰＵ等を有するマイコンである。制御部１２には、送信部１３及び受信部１４が設けられている。 FIG. 2 is a block diagram showing a configuration example of the in-vehicle device 1 according to the embodiment of the present invention. The vehicle-mounted device 1 detects the position of the portable device 3 by performing wireless communication with the portable device 3, and performs keyless entry control for controlling the locking and unlocking of the vehicle door according to the detected position of the portable device 3. It has a function. Specifically, the in-vehicle device 1 includes a control unit 12 that controls the operation of each component of the own device. The control unit 12 is a microcomputer having, for example, one or a plurality of CPUs (Central Processing Unit), a multi-core CPU, and the like. The control unit 12 is provided with a transmission unit 13 and a reception unit 14.
　送信部１３は複数のＬＦ送信アンテナ２に接続されており、制御部１２の制御に従って、携帯機３の位置を検出するための位置検出用信号を、ＬＦ（Low Frequency）帯の電波を用いて送信する。例えば、制御部１２は、車両ドアのリクエストスイッチが操作されたことを示す信号が入力された場合、送信部１３にて位置検出用信号を送信する。位置検出用信号の搬送波としては３０ｋＨｚ～３００ｋＨｚのＬＦ帯を使用するが、この周波数帯に限定するものでは無い。各ＬＦ送信アンテナ２から送信される信号の強度は、携帯機３が２つ以上のＬＦ送信アンテナ２からの信号を受信できるように設定されている。 The transmission unit 13 is connected to a plurality of LF transmission antennas 2, and a position detection signal for detecting the position of the portable device 3 according to the control of the control unit 12, using radio waves in the LF (Low Frequency) band. Send. For example, when a signal indicating that a request switch for a vehicle door has been operated is input to the control unit 12, the transmission unit 13 transmits a position detection signal. As a carrier wave for the position detection signal, an LF band of 30 kHz to 300 kHz is used, but it is not limited to this frequency band. The strength of the signal transmitted from each LF transmission antenna 2 is set so that the portable device 3 can receive signals from two or more LF transmission antennas 2.
　携帯機３は、複数の各ＬＦ送信アンテナ２から送信された位置検出用信号等を受信し、各位置検出用信号の受信信号強度を検出する。そして、携帯機３は、検出して得られた各位置検出用信号の受信信号強度を含む応答信号を、ＵＨＦ（Ultra High Frequency）帯の電波を用いて車載機１へ送信する。搬送波としては３００ＭＨｚ～３ＧＨｚのＵＨＦ帯を使用するが、この周波数帯に限定するものでは無い。 The portable device 3 receives the position detection signals transmitted from the plurality of LF transmission antennas 2 and detects the received signal strength of each position detection signal. Then, the portable device 3 transmits a response signal including the received signal strength of each position detection signal obtained by the detection to the in-vehicle device 1 using radio waves in the UHF (Ultra High Frequency) band. The carrier wave uses a UHF band of 300 MHz to 3 GHz, but is not limited to this frequency band.
　受信部１４は車両用アンテナ１１に接続されており、携帯機３からＵＨＦ帯の電波を用いて送信された各種応答信号を受信し、制御部１２へ出力する。 The receiving unit 14 is connected to the vehicle antenna 11, receives various response signals transmitted from the portable device 3 using radio waves in the UHF band, and outputs the response signals to the control unit 12.
　制御部１２は、応答信号に含まれる受信信号強度に基づいて携帯機３の位置を特定する。各ＬＦ送信アンテナ２から送信される位置検出用信号の受信信号強度は、各ＬＦ送信アンテナ２と、携帯機３との距離に対応する情報であるため、受信信号強度を利用することによって、車両Ｃに対する携帯機３の位置を特定することが可能である。制御部１２は、携帯機３が所定領域内にある場合、例えばリクエストスイッチ近傍に位置している場合、車両ドアの施解錠を指示する施解錠信号を図示しないドア施錠装置へ出力する。ドア施錠装置は、各ドアの施錠及び解錠を行う施錠機構と、該施錠機構を駆動するアクチュエータとを備え、施解錠信号に従って、車両ドアの施解錠を行う。 The control unit 12 specifies the position of the portable device 3 based on the received signal strength included in the response signal. Since the received signal strength of the position detection signal transmitted from each LF transmission antenna 2 is information corresponding to the distance between each LF transmission antenna 2 and the portable device 3, the received signal strength is used to It is possible to specify the position of the portable device 3 with respect to C. When the portable device 3 is in the predetermined area, for example, when it is located near the request switch, the control unit 12 outputs a locking / unlocking signal for instructing locking / unlocking of the vehicle door to a door locking device (not shown). The door locking device includes a locking mechanism that locks and unlocks each door and an actuator that drives the locking mechanism, and locks and unlocks the vehicle door according to a locking and unlocking signal.
　図３は、本発明の実施形態に係る車両用アンテナ１１及び車載機１の一構成例を示す側断面図である。車載機１は、グランド層を有する樹脂製又はセラミックス製の基板１０を備え、基板１０上には受信部１４及び車両用アンテナ１１が配されている。車両用アンテナ１１が配された基板１０は収容体１５に収容されている。 FIG. 3 is a side sectional view showing a configuration example of the vehicle antenna 11 and the in-vehicle device 1 according to the embodiment of the present invention. The in-vehicle device 1 includes a resin or ceramic substrate 10 having a ground layer, and a receiving unit 14 and a vehicle antenna 11 are disposed on the substrate 10. The substrate 10 on which the vehicle antenna 11 is arranged is accommodated in a container 15.
　車両用アンテナ１１は、例えば逆Ｌ型のモノポールアンテナであり、電波の受信に係る受電が行われる線状の第１アンテナエレメント１１ａと、当該第１アンテナエレメント１１ａに接続された線状の第２アンテナエレメント１１ｂとを有する。第１及び第２アンテナエレメント１１ａ、１１ｂは、例えば、銅、真鍮等の導電性金属、合金等からなる線状のアンテナ部材の折り曲げ加工によって形成される。本実施形態に係る第１及び第２アンテナエレメント１１ａ、１１ｂは円形断面を有する線状であるが、その断面形状は特に限定されるものでは無く、角柱状であっても良いし、帯状であっても良い。
　第１アンテナエレメント１１ａの一端部には、第１アンテナエレメント１１ａを基板１０に接続するための雄端子１１ｅが形成されている。基板１０には、雄端子１１ｅが挿入され、電気的に接続される雌端子１８が設けられおり、雌端子１８は導線１９を介して受信部１４に接続されている。第１アンテナエレメント１１ａは、雄端子１１ｅが雌端子１８に挿入されると、基板１０に対して第１アンテナエレメント１１ａが略垂直になる姿勢で基板１０に接続され、第１アンテナエレメント１１ａは導線１９を介して受信部１４に接続されている。
　第１アンテナエレメント１１ａの他端部は、第２アンテナエレメント１１ｂの一端部に対して電気的に接続されている。第２アンテナエレメント１１ｂは基板１０に対して略平行である。以下、第１アンテナエレメント１１ａの他端部と、第２アンテナエレメント１１ｂの一端部とが電気的に接続される部位を接続部１１ｃと呼び、第２アンテナエレメント１１ｂの端部の内、接続部１１ｃから最遠の端部を先端部１１ｄと呼ぶ。 The vehicle antenna 11 is, for example, an inverted L-type monopole antenna, and includes a linear first antenna element 11a that receives power related to reception of a radio wave, and a linear first antenna element 11a connected to the first antenna element 11a. 2 antenna elements 11b. The first and second antenna elements 11a and 11b are formed by bending a linear antenna member made of, for example, a conductive metal such as copper or brass, an alloy, or the like. The first and second antenna elements 11a and 11b according to this embodiment are linear with a circular cross section, but the cross sectional shape is not particularly limited, and may be a prismatic shape or a belt shape. May be.
A male terminal 11e for connecting the first antenna element 11a to the substrate 10 is formed at one end of the first antenna element 11a. The board 10 is provided with a female terminal 18 into which a male terminal 11 e is inserted and electrically connected. The female terminal 18 is connected to the receiving unit 14 via a conductor 19. When the male terminal 11e is inserted into the female terminal 18, the first antenna element 11a is connected to the substrate 10 in a posture in which the first antenna element 11a is substantially perpendicular to the substrate 10, and the first antenna element 11a is a conductor. 19 is connected to the receiving unit 14 through 19.
The other end of the first antenna element 11a is electrically connected to one end of the second antenna element 11b. The second antenna element 11 b is substantially parallel to the substrate 10. Hereinafter, a portion where the other end portion of the first antenna element 11a and one end portion of the second antenna element 11b are electrically connected is referred to as a connection portion 11c, and the connection portion of the end portions of the second antenna element 11b. An end portion farthest from 11c is referred to as a tip portion 11d.
　収容体１５は、中空略直方体形状をなし、基板１０が配される底板部１６と、該底板部１６を覆う蓋部１７とを備える。蓋部１７は、矩形状の天板部分と、天板部の周囲に形成された側壁部分とを有する。天板部分の一部は、高誘電率の第１誘電体１７ａによって形成され、天板部分の他部及び側壁部分は、低誘電率の第２誘電体１７ｂによって形成されている。第２アンテナエレメント１１ｂの先端部側部分は、第１誘電体１７ａに接触し、埋没している。第２アンテナエレメント１１ｂの接続部１１ｃ側部分は第２誘電体１７ｂに接触し、埋没している。第１誘電体１７ａ及び第２誘電体１７ｂを有する蓋部１７は、２色射出成形によって成形することができる。 The container 15 has a hollow substantially rectangular parallelepiped shape, and includes a bottom plate portion 16 on which the substrate 10 is disposed and a lid portion 17 that covers the bottom plate portion 16. The lid portion 17 has a rectangular top plate portion and a side wall portion formed around the top plate portion. A part of the top plate portion is formed by a first dielectric 17a having a high dielectric constant, and the other portion and the side wall portion of the top plate portion are formed by a second dielectric 17b having a low dielectric constant. The tip side portion of the second antenna element 11b is in contact with and buried in the first dielectric 17a. The connection antenna 11c side portion of the second antenna element 11b is in contact with and buried in the second dielectric 17b. The lid portion 17 having the first dielectric 17a and the second dielectric 17b can be formed by two-color injection molding.
　第２アンテナエレメント１１ｂの長手方向における第２誘電体１７ｂとの接触長は、接続部１１ｃと、先端部１１ｄとの距離の２分の１以下である構成が好ましい。また、後述するように第２アンテナエレメント１１ｂの第２誘電体１７ｂとの接触長は、接続部１１ｃと、先端部１１ｄとの距離の２０％以上３６％以下である構成が好ましい。より好ましくは、当該接触長は、接続部１１ｃと、先端部１１ｄとの距離の約２７％以上３６％以下である構成が好ましい。更に好ましくは、接触長は、接続部１１ｃと、先端部１１ｄとの距離の約２７％である構成が好ましい。 It is preferable that the contact length of the second antenna element 11b with the second dielectric 17b in the longitudinal direction is not more than one half of the distance between the connection portion 11c and the tip portion 11d. As will be described later, the contact length of the second antenna element 11b with the second dielectric 17b is preferably 20% or more and 36% or less of the distance between the connection portion 11c and the tip portion 11d. More preferably, the contact length is preferably about 27% to 36% of the distance between the connection portion 11c and the tip portion 11d. More preferably, the contact length is preferably about 27% of the distance between the connecting portion 11c and the tip portion 11d.
　第１誘電体１７ａは、合成樹脂とセラミックス粉末とを含有する誘電性複合材料であり、その比誘電率は５以上が好ましい（例えば、国際公開番号ＷＯ２０１０／０２７０７４号）。第２誘電体１７ｂは、例えば空気である。
　第１誘電体１７ａを構成する合成樹脂としては、エポキシ樹脂、熱硬化性ポリイミド樹脂等の熱硬化性樹脂を用いることができるが、射出成形等の溶融成形加工が可能である点で、熱可塑性樹脂を用いることが好ましい。熱可塑性樹脂としては、例えば、ポリエチレン（低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、線状低密度ポリエチレン、超低密度ポリエチレン）、ポリプロピレン等のポリオレフィン樹脂；ポリスチレン、シンジオタクチックポリスチレン、変性ポリスチレン等のポリスチレン樹脂；ポリフェニレンオキシド樹脂；ポリフェニレンスルフィド樹脂等が好ましい。これらの他、熱可塑性樹脂としては、液晶ポリマー、ＡＢＳ樹脂、熱可塑性ポリエステル樹脂、ポリアセタール樹脂、ポリアミド樹脂、メチルペンテン樹脂、環状オレフィン樹脂、ポリカーボネート樹脂、熱溶融性フッ素樹脂、熱可塑性ポリイミド樹脂、ポリエーテルイミド樹脂等が挙げられる。これらの合成樹脂は、それぞれ単独で、あるいは２種以上を組み合わせて用いることができる。
　セラミックス粉末は、酸化チタン又はチタン酸塩からなる粉末である。チタン酸塩としては、例えば、チタン酸カルシウム、チタン酸バリウム、チタン酸ストロンチウム、チタン酸マグネシウム、チタン酸鉛、チタン酸カルシウムマグネシウム、チタン酸ネオジウム等、高誘電性を示すものが好ましい。これらのセラミックス粉末の中でも、酸化チタン粉末、チタン酸カルシウム粉末、及びチタン酸ストロンチウム粉末が好ましく、合成が容易で、比重が小さく、かつ、高い比誘電率と低い誘電正接を示す誘電性複合材料が得られ易い点で、チタン酸カルシウム粉末が特に好ましい。 The first dielectric 17a is a dielectric composite material containing a synthetic resin and ceramic powder, and the relative dielectric constant thereof is preferably 5 or more (for example, International Publication No. WO2010 / 027074). The second dielectric 17b is, for example, air.
As the synthetic resin constituting the first dielectric 17a, a thermosetting resin such as an epoxy resin or a thermosetting polyimide resin can be used, but it is thermoplastic in that it can be melt-molded such as injection molding. It is preferable to use a resin. Examples of the thermoplastic resin include polyolefin resins such as polyethylene (low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ultra low density polyethylene), and polypropylene; polystyrene, syndiotactic polystyrene, modified polystyrene, and the like. Polystyrene resin; polyphenylene oxide resin; polyphenylene sulfide resin and the like are preferable. In addition to these, thermoplastic resins include liquid crystal polymer, ABS resin, thermoplastic polyester resin, polyacetal resin, polyamide resin, methylpentene resin, cyclic olefin resin, polycarbonate resin, hot melt fluororesin, thermoplastic polyimide resin, poly Examples include ether imide resins. These synthetic resins can be used alone or in combination of two or more.
The ceramic powder is a powder made of titanium oxide or titanate. As a titanate, what shows high dielectric properties, such as calcium titanate, barium titanate, strontium titanate, magnesium titanate, lead titanate, calcium magnesium titanate, neodymium titanate, is preferable, for example. Among these ceramic powders, titanium oxide powder, calcium titanate powder, and strontium titanate powder are preferable, and a dielectric composite material that is easy to synthesize, has a low specific gravity, and exhibits a high relative dielectric constant and a low dielectric loss tangent. Calcium titanate powder is particularly preferable because it is easy to obtain.
　図４は、第１誘電体１７ａ及び第２アンテナエレメント１１ｂの接触長と、車両用アンテナ１１の利得との関係を示すグラフである。横軸は、第１誘電体１７ａと、第２アンテナエレメント１１ｂとの接触長を示し、左側縦軸は、基板１０に対する垂直面内における電波の受信に係る利得を示し、右側縦軸は、基板１０に対する水平面内における電波の受信に係る利得を示している。
　図４のグラフに示すプロットは、以下の実験条件で得られたものであり、菱形のプロットは、垂直面内における利得を示し、矩形のプロットは水平面内における利得を示している。実験で用いられた第１アンテナエレメント１１ａは、長さ１８ｍｍ、直径２ｍｍの棒状のエレメントであり、第２アンテナエレメント１１ｂは、長さ９０ｍｍ、直径２ｍｍの棒状のエレメントである。第１誘電体１７ａの比誘電率は２８、誘電正接は０．００２の部材である。第１誘電体１７ａは、平板略直方体形状をなし、厚みは５ｍｍ、基板１０に垂直な方向の長さは１７ｍｍである。そして、このように構成された車両用アンテナ１１を用いて、３１５ＭＨｚの電波を受信したときの利得を測定し、図４にプロットした。 FIG. 4 is a graph showing the relationship between the contact length between the first dielectric 17 a and the second antenna element 11 b and the gain of the vehicle antenna 11. The horizontal axis represents the contact length between the first dielectric 17a and the second antenna element 11b, the left vertical axis represents the gain associated with reception of radio waves in the vertical plane with respect to the substrate 10, and the right vertical axis represents the substrate. 10 shows gain related to reception of radio waves in a horizontal plane with respect to 10.
The plot shown in the graph of FIG. 4 is obtained under the following experimental conditions, the rhombus plot indicates the gain in the vertical plane, and the rectangular plot indicates the gain in the horizontal plane. The first antenna element 11a used in the experiment is a rod-shaped element having a length of 18 mm and a diameter of 2 mm, and the second antenna element 11b is a rod-shaped element having a length of 90 mm and a diameter of 2 mm. The first dielectric 17a is a member having a relative dielectric constant of 28 and a dielectric loss tangent of 0.002. The first dielectric 17a has a substantially rectangular parallelepiped shape, a thickness of 5 mm, and a length in a direction perpendicular to the substrate 10 is 17 mm. Then, using the vehicle antenna 11 configured as described above, the gain when receiving a 315 MHz radio wave was measured and plotted in FIG.
　図４に示すグラフから分かるように、第１誘電体１７ａ及び第２アンテナエレメント１１ｂの接触部位は、第２アンテナエレメント１１ｂの長手方向全体に亘るよりも、第２アンテナエレメント１１ｂの長手方向における５０％以下の領域で接触した方が、利得が高いことが分かる。
　また、第１誘電体１７ａ及び第２アンテナエレメント１１ｂの接触部位の長さは、もちろん短ければ短い程良いということは無く、基板１０に対する垂直面内の利得については、接触長が第２アンテナエレメント１１ｂの全長の２０％以上に設定すると、高い利得が得られることが分かる。同様に、接触長を第２アンテナエレメント１１ｂの全長の２７％以上３６％以下に設定すると、垂直面内における利得、水平面内における利得の双方が高くなることが分かる。更に、接触長を第２アンテナエレメント１１ｂの全長の略２７％に設定すると、基板１０に対する垂直面内における利得、水平面内における利得の双方が最大になることがわかる。 As can be seen from the graph shown in FIG. 4, the contact portion between the first dielectric 17a and the second antenna element 11b is 50 in the longitudinal direction of the second antenna element 11b rather than the entire longitudinal direction of the second antenna element 11b. It can be seen that the gain is higher when the contact is made in the region of% or less.
In addition, the shorter the length of the contact portion between the first dielectric 17a and the second antenna element 11b is, of course, not better, and the gain in the vertical plane with respect to the substrate 10 is the contact length of the second antenna element. It can be seen that a high gain can be obtained by setting it to 20% or more of the total length of 11b. Similarly, when the contact length is set to 27% or more and 36% or less of the entire length of the second antenna element 11b, it can be seen that both the gain in the vertical plane and the gain in the horizontal plane are increased. Furthermore, when the contact length is set to approximately 27% of the entire length of the second antenna element 11b, it can be seen that both the gain in the vertical plane relative to the substrate 10 and the gain in the horizontal plane are maximized.
　このように構成された車両用アンテナ１１及び車載機１によれば、第２アンテナエレメント１１ｂに高誘電率の第１誘電体１７ａを接触させることによる波長短縮効果によって、車両用アンテナ１１を小型化することができる。なお、本実施形態では、第２アンテナエレメント１１ｂの一部に第１誘電体１７ａを接触させる構成であるが、車両用アンテナ１１を大型化せずとも、車両用アンテナ１１の利得を保持できることが確認された。なお、ＥＣＵ（Electronic Control Unit）の筐体内部に収容される車両用アンテナ１１の場合、寸法的な制限があるが、車両用アンテナ１１の小型化によって、寸法要求を満たすことができる。また、車両Ｃの天井外側に設置されるアンテナの場合、空気抵抗、車高制限等の問題から、寸法的な制限があるが、車両用アンテナ１１の小型化によって、寸法要求を満たすことができる。
　また、第２アンテナエレメント１１ｂの先端部側部分に高誘電率の第１誘電体１７ａを接触させ、接続部側部分に低誘電率の第２誘電体１７ｂを接触させることによって、車両用アンテナ１１の利得を向上させることができ、車両用アンテナ１１を用いた通信距離の長距離化が可能になる。 According to the vehicular antenna 11 and the vehicle-mounted device 1 configured as described above, the vehicular antenna 11 can be downsized by the wavelength shortening effect caused by bringing the first dielectric 17a having a high dielectric constant into contact with the second antenna element 11b. can do. In the present embodiment, the first dielectric 17a is in contact with a part of the second antenna element 11b. However, the gain of the vehicle antenna 11 can be maintained without increasing the size of the vehicle antenna 11. confirmed. In the case of the vehicular antenna 11 housed inside a casing of an ECU (Electronic Control Unit), there is a dimensional limitation, but the size requirement can be satisfied by downsizing the vehicular antenna 11. Further, in the case of an antenna installed outside the ceiling of the vehicle C, there are dimensional limitations due to problems such as air resistance and vehicle height limitation, but the size requirement can be met by downsizing the vehicle antenna 11. .
Further, the first dielectric 17a having a high dielectric constant is brought into contact with the front end portion of the second antenna element 11b, and the second dielectric 17b having a low dielectric constant is brought into contact with the connecting portion side portion. The communication distance using the vehicle antenna 11 can be increased.
　また、第２アンテナエレメント１１ｂを、蓋部１７の第１誘電体１７ａ及び第２誘電体１７ｂに埋没させることによって、車両用アンテナ１１の耐振動性をより向上させることができる。 Moreover, the vibration resistance of the vehicle antenna 11 can be further improved by burying the second antenna element 11b in the first dielectric 17a and the second dielectric 17b of the lid portion 17.
　更に、低誘電率の第２誘電体１７ｂを低誘電率の樹脂で構成することによって、車両用アンテナ１１及び車載機１の軽量化及びコストの低減が可能である。 Furthermore, by configuring the low dielectric constant second dielectric 17b with a low dielectric constant resin, the vehicle antenna 11 and the vehicle-mounted device 1 can be reduced in weight and cost.
　更にまた、第１誘電体１７ａを、合成樹脂とセラミックス粉末とを含有する誘電性複合材料で構成することによって、射出成形等を用いて容易に高誘電率で、かつ破損しにくい第２誘電体１７ｂを製造することができる。従って、車両用アンテナ１１及び車載機１に係る製造コストの低減が可能である。 Furthermore, the first dielectric 17a is made of a dielectric composite material containing a synthetic resin and a ceramic powder, so that the second dielectric can be easily damaged with high dielectric constant using injection molding or the like. 17b can be manufactured. Accordingly, it is possible to reduce the manufacturing costs related to the vehicle antenna 11 and the vehicle-mounted device 1.
　なお、上記実施形態では、車両用アンテナ１１の適用例として、携帯機３の位置を検出する車載機１を説明したが、一例であり、車両Ｃの各タイヤに設けられたタイヤ空気圧センサから送信される空気圧信号を受信し、各タイヤの空気圧を監視する車両用通信システム（ＴＰＭＳ：Tire Pressure Monitoring System）用、テレマティクス用、高度道路交通システム（ITS：Intelligent Transport Systems）用、リモートエンジンスタート（RES：Remote Engine Starter）システム用等、その他の任意の車載通信機に本発明を適用することができる。 In the above embodiment, the vehicle-mounted device 1 that detects the position of the portable device 3 has been described as an application example of the vehicle antenna 11. However, the vehicle-mounted device 1 is an example, and is transmitted from a tire pressure sensor provided on each tire of the vehicle C. For vehicle communication systems (TPMS: Tire Pressure Monitoring System), telematics, intelligent road transport systems (ITS: Intelligent Transport Systems), remote engine start (RES) The present invention can be applied to any other in-vehicle communication device such as for a remote engine starter system.
　また、車両用アンテナ１１は、受信専用又は送信専用のアンテナであっても良いし、送受信用のアンテナであっても良い。なお、車両用アンテナ１１を送信用のアンテナとして利用する場合、第１アンテナエレメント１１ａは、電波の送信に係る給電が行われるアンテナエレメントとして機能する。 Further, the vehicle antenna 11 may be a reception-only or transmission-only antenna, or a transmission / reception antenna. Note that when the vehicle antenna 11 is used as a transmission antenna, the first antenna element 11a functions as an antenna element to which power supply related to transmission of radio waves is performed.
　更に、上記実施形態では、逆Ｌ型アンテナを例に説明したが、逆Ｆ型アンテナ、逆Ｕ字型アンテナ等、線状又は帯状のアンテナエレメントを有する車両用アンテナ１１であれば、その形状は特に限定されない。 Furthermore, in the above embodiment, the inverted L-type antenna has been described as an example. However, if the vehicle antenna 11 has a linear or belt-like antenna element, such as an inverted F-type antenna or an inverted U-shaped antenna, the shape is There is no particular limitation.
　更にまた、収容体１５における第１アンテナエレメント１１ａの埋没箇所、第２誘電体１７ｂの形成箇所は特に限定されるものでは無く、種々の変形が可能である。例えば、第２アンテナエレメント１１ｂの先端部側部分が蓋部１７の側壁部に達するように第２アンテナエレメント１１ｂを蓋部１７に埋没させ、当該側壁部を第２誘電体１７ｂで形成しても良い。 Furthermore, the location where the first antenna element 11a is buried and the location where the second dielectric 17b is formed in the container 15 are not particularly limited, and various modifications are possible. For example, the second antenna element 11b may be buried in the lid portion 17 so that the tip side portion of the second antenna element 11b reaches the side wall portion of the lid portion 17, and the side wall portion may be formed of the second dielectric 17b. good.
　更にまた、図３に示した車両用アンテナ１１及び誘電体の構成及び接触態様は一例であり、種々の変形が可能である。 Furthermore, the configurations and contact modes of the vehicle antenna 11 and the dielectric shown in FIG. 3 are merely examples, and various modifications are possible.
　図５は、変形例に係る車両用アンテナ１１及び車載機１０１の一構成例を示す側断面図である。第１の変形例に係る車両用アンテナ１１は、収容体１５の蓋部１７に埋没しておらず、第２アンテナエレメント１１ｂの先端部側部分は、蓋部１７の第１誘電体１７ａに接触し、第２アンテナエレメント１１ｂの他部は第２誘電体１７ｂに接触している。このように、第２アンテナエレメント１１ｂを第１誘電体１７ａ及び第２誘電体１７ｂに接触させることによって、上記実施形態と同様の効果を得ることができる。 FIG. 5 is a side sectional view showing a configuration example of the vehicle antenna 11 and the vehicle-mounted device 101 according to a modification. The vehicular antenna 11 according to the first modification is not buried in the lid portion 17 of the container 15, and the tip side portion of the second antenna element 11 b contacts the first dielectric 17 a of the lid portion 17. The other part of the second antenna element 11b is in contact with the second dielectric 17b. As described above, by bringing the second antenna element 11b into contact with the first dielectric 17a and the second dielectric 17b, it is possible to obtain the same effect as in the above embodiment.
　１，１０１　車載機
　２　ＬＦ送信アンテナ
　３　携帯機
　１０　基板
　１１　車両用アンテナ
　１１ａ　第１アンテナエレメント
　１１ｂ　第２アンテナエレメント
　１１ｃ　接続部
　１１ｄ　先端部
　１１ｅ　雄端子
　１２　制御部
　１３　送信部
　１４　受信部
　１５　収容体
　１６　底板部
　１７　蓋部
　１７ａ　第１誘電体
　１７ｂ　第２誘電体
　１８　雌端子
　１９　導線
　Ｃ　車両
  DESCRIPTION OF SYMBOLS 1,101 In-vehicle machine 2 LF transmission antenna 3 Portable machine 10 Board | substrate 11 Vehicle antenna 11a 1st antenna element 11b 2nd antenna element 11c Connection part 11d Tip part 11e Male terminal 12 Control part 13 Transmission part 14 Reception part 15 Housing | casing body 16 Bottom plate portion 17 Lid portion 17a First dielectric 17b Second dielectric 18 Female terminal 19 Conductor C Vehicle

Claims (3)

  1. 　電波の送信又は受信に係る給電又は受電が行われる線状又は帯状の第１アンテナエレメントと、第１アンテナエレメントに接続された線状又は帯状の第２アンテナエレメントと、第１及び第２アンテナエレメントを収容する収容体とを備えた車両用アンテナであって、
    　少なくとも第２アンテナエレメントは前記収容体に接触しており、
    　前記収容体は、
    　第１アンテナエレメント及び第２アンテナエレメントの接続部と、該接続部から最遠の第２アンテナエレメントの先端部とに亘るエレメント部分の内、前記先端部側の部分に接触している高誘電率の第１誘電体と、前記接続部側の部分に接触している低誘電率の第２誘電体とを有する
    　車両用アンテナ。     A linear or belt-like first antenna element that performs power feeding or power reception related to transmission or reception of radio waves, a linear or belt-like second antenna element connected to the first antenna element, and first and second antenna elements A vehicle antenna comprising a housing for housing
    At least the second antenna element is in contact with the container;
    The container is
    A high dielectric constant that is in contact with a portion on the tip portion side of the element portion extending from the connection portion of the first antenna element and the second antenna element and the tip portion of the second antenna element farthest from the connection portion. A vehicle antenna comprising: a first dielectric body; and a low dielectric constant second dielectric body in contact with the portion on the connection portion side.
  2. 　前記第２アンテナエレメントは第１及び第２誘電体に埋没している
    　請求項１に記載の車両用アンテナ。     The vehicle antenna according to claim 1, wherein the second antenna element is buried in the first and second dielectrics.
  3. 　請求項１又は請求項２に記載の車両用アンテナと、
    　外部の送信機から送信された信号を前記車両用アンテナにて受信する受信部と
    　を備える車載機。
          The vehicle antenna according to claim 1 or 2,
    A vehicle-mounted device comprising: a receiving unit that receives a signal transmitted from an external transmitter by the vehicle antenna.
PCT/JP2017/036251 2016-10-06 2017-10-05 Vehicle antenna and vehicle-mounted device WO2018066640A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016198499A JP2018061175A (en) 2016-10-06 2016-10-06 Antenna for vehicle and on-vehicle machine
JP2016-198499 2016-10-06

Publications (1)

Publication Number Publication Date
WO2018066640A1 true WO2018066640A1 (en) 2018-04-12

Family

ID=61831026

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/036251 WO2018066640A1 (en) 2016-10-06 2017-10-05 Vehicle antenna and vehicle-mounted device

Country Status (2)

Country Link
JP (1) JP2018061175A (en)
WO (1) WO2018066640A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7046299B2 (en) * 2018-08-22 2022-04-04 住友電装株式会社 Antenna device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003298345A (en) * 2002-04-04 2003-10-17 Matsushita Electric Ind Co Ltd Antenna
JP2008167393A (en) * 2006-12-04 2008-07-17 Toshiba Corp Surface-mounted antenna device
JP2009060374A (en) * 2007-08-31 2009-03-19 Auto Network Gijutsu Kenkyusho:Kk On-vehicle wireless device
JP2011130239A (en) * 2009-12-18 2011-06-30 Tdk Corp Double resonant antenna, method for manufacturing the same, and communication device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003298345A (en) * 2002-04-04 2003-10-17 Matsushita Electric Ind Co Ltd Antenna
JP2008167393A (en) * 2006-12-04 2008-07-17 Toshiba Corp Surface-mounted antenna device
JP2009060374A (en) * 2007-08-31 2009-03-19 Auto Network Gijutsu Kenkyusho:Kk On-vehicle wireless device
JP2011130239A (en) * 2009-12-18 2011-06-30 Tdk Corp Double resonant antenna, method for manufacturing the same, and communication device

Also Published As

Publication number Publication date
JP2018061175A (en) 2018-04-12

Similar Documents

Publication Publication Date Title
US8988207B2 (en) Information acquiring device
CN110520585B (en) Method for activating a vehicle function from a portable access device and related activation module
JP4625724B2 (en) Vehicle anti-theft device
US6433728B1 (en) Integrally molded remote entry transmitter
US7095381B2 (en) Antenna coil
CN103262128B (en) The compact type ID transmitter with wireless near field communication scheme of Motor vehicles connecting system
US20120071214A1 (en) Inductively Coupled Signal Booster For A Wireless Communication Device And In Combination Therwith
US20060170610A1 (en) Antenna system for remote control automotive application
JP5109172B2 (en) Transmitting antenna device and door handle in which transmitting antenna device is accommodated
US8598983B2 (en) Transceiver and electronic key including transceiver
US7564415B2 (en) Antenna system for remote control automotive application
US11459801B2 (en) Motor vehicle door handle with device for detecting an intention to lock and to unlock a motor vehicle door
JP2010209525A (en) Door handle
WO2018066640A1 (en) Vehicle antenna and vehicle-mounted device
WO2018066639A1 (en) Vehicle antenna and on-vehicle machine
JP3826881B2 (en) Vehicle door handle device
JP5088026B2 (en) Smart keyless entry system
US20190296427A1 (en) Antenna device
JP3897728B2 (en) Vehicle door handle device
JP2001352587A (en) Radio communication equipment
JP7017387B2 (en) Proximity sensor and keyless entry device equipped with it
US8681055B2 (en) Coupling structure for antenna device
JP2007068115A (en) On-vehicle radio receiver
JP2009212923A (en) Combined antenna, communication apparatus, and electronic key system
JP2007150823A (en) Vehicle-mounted radio receiver

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17858476

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17858476

Country of ref document: EP

Kind code of ref document: A1