EP0375416B1 - Ebene Schlitzantenne - Google Patents

Ebene Schlitzantenne Download PDF

Info

Publication number
EP0375416B1
EP0375416B1 EP19890313427 EP89313427A EP0375416B1 EP 0375416 B1 EP0375416 B1 EP 0375416B1 EP 19890313427 EP19890313427 EP 19890313427 EP 89313427 A EP89313427 A EP 89313427A EP 0375416 B1 EP0375416 B1 EP 0375416B1
Authority
EP
European Patent Office
Prior art keywords
conducting surface
coaxial lines
slot antenna
coaxial
central
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.)
Expired - Lifetime
Application number
EP19890313427
Other languages
English (en)
French (fr)
Other versions
EP0375416A3 (en
EP0375416A2 (de
Inventor
Takuji Harada
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.)
Harada Industry Co Ltd
Original Assignee
Harada Industry Co Ltd
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 Harada Industry Co Ltd filed Critical Harada Industry Co Ltd
Publication of EP0375416A2 publication Critical patent/EP0375416A2/de
Publication of EP0375416A3 publication Critical patent/EP0375416A3/en
Application granted granted Critical
Publication of EP0375416B1 publication Critical patent/EP0375416B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01Q13/10—Resonant slot antennas
    • H01Q13/16—Folded slot antennas
    • 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
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0464—Annular ring patch

Definitions

  • the present invention relates to a plane antenna which is installed in a horizontal portion such as roof, trunk lid, etc. of the body surface of an automobile, etc.
  • Antennas without projections are in demand as mobile antennas for use in automobiles, etc., since such antennas eliminate wind noise and improve the external appearance of the vehicle. In this respect, plan or flat plate for antennas are desirable.
  • One type of the plane antenna is a slot antenna.
  • a portion of the antenna conductor is cut out in the form of a circle.
  • the circle cut-out generally is made by uniformly cutting a spaced slots arranged in a circle.
  • a closed-circle slot is formed between a central conductor and a peripheral conductor.
  • the core conductor of a coaxial cable is connected to the edge of the central conductor, and the outer skin of the coaxial cable is connected to the peripheral conductor, so that signals received by the antenna can be led out via the coaxial cable.
  • the radiation pattern of a conventional device of this type has the form of a distorted figure eight.
  • a slot antenna of this general type is shown in EP-A-0261762.
  • the antenna is located in a vehicle roof and has a generally rectangular slot.
  • Separate AM and FM feeds are provided by means of coaxial cables connected across respective perpendicular sides of the slot.
  • the directionality varies according to the position where the coaxial cable is connected (i.e., the signal extraction position).
  • the sensitivity when the direction of motion of the vehicle (such as an automobile, etc) changes, the sensitivity also changes. Accordingly, in cases where the direction of motion of the vehicle is frequently altered, there are frequent changes in the sensitivity. In the case of radio reception, etc., this makes the received signal difficult to hear.
  • the present invention provides a plane slot antenna comprising: a peripheral conducting surface; a central conducting surface provided in said peripheral conducting surface with a space in between; and a plurality of coaxial lines, core conductors of said coaxial lines connected to said central conducting surface at different points on said central conducting surface and outer skins of said coaxial lines, connected to said peripheral conducting surface; characterised by a switching means provided between said coaxial lines and a signal receiver, said switching means switching a connection between one of said coaxial lines and said signal receiver depending upon at least one of the strength and phase of received signal.
  • the reception sensitivity is consistently stable even if the direction of motion of the vehicle is frequently changed.
  • Fig. 1 is an explanatory diagram which illustrates one embodiment of the present invention.
  • a central conductor or central conducting surface 13 is installed in the central portion of a peripheral conductor or peripheral conducting surface 11, and a closed-circle slot or space 12 is formed between the peripheral conductor 11 and central conductor 13.
  • the core conductor 21 of a first coaxial cable or coaxial line 20 is connected to the right edge of the central conductor 13 with respect to Fig. 1, and the outer skin 22 of the first coaxial cable 20 is connected to the peripheral conductor 11 in a position near the right edge of the central conductor 13.
  • the core conductor 31 of a second coaxial cable or coaxial line 30 is connected to the lower edge of the central conductor 13 with respect to Fig. 1, and the outer skin 32 of the second coaxial cable 30 is connected to the peripheral conductor 11 in a position near the lower edge of the central conductor 13.
  • the core conductor 23 on the other end of the coaxial cable 20 and the core conductor 23 at the other end of the coaxial cable 30 are arranged so that switching between the two can be accomplished by means of a switch 40.
  • a detecting means (not shown) is provided so that it detects the strength and/or phase of the reception signal, and operates the switch 40 so that either the coaxial cable 20 or 30 which can provide the most favorable strength and/or phase is selected.
  • the circumference of the closed-circle slot 12 is set so that it is roughly equal to the wavelength of the reception signal.
  • the circular slot antenna 10 as a whole is made of a thin film. In use the antenna is bonded to a plastic trunk lid, etc., of an automobile.
  • the switch 40 In use, if the switch 40 is initially connected to the core conductor 33 of the coaxial cable 30 with the reception signal strength at a prescribed level or higher, and when the direction of motion of the automobile changes so that the strength of the reception signal traveling through the coaxial cable 30 drops below the prescribed level, then this drop in the signal strength is detected by the detecting circuit, and a control means (not shown) switches the switch 40 so that the reception signal is now sent to a receiver (not shown) via the coaxial cable 20. Afterward, if the strength of the signal sent via the coaxial cable 20 should drop, the switch 40 is then switched back to the coaxial cable 30, and the above-mentioned operation is repeated whenever necessary.
  • the switch 40 is used in order to facilitate the description of the invention.
  • the signal extraction position can be selected electronically as described below.
  • a diode is connected to the core conductor 23 of the coaxial cable 20, and a bias is applied to this diode in forward and reverse directions.
  • the system is arranged so that the signal traveling through the coaxial cable 20 passes through when a bias is applied, for example, in the forward direction.
  • a diode is connected to the core conductor 33 of the coaxial cable 30 too, and is arranged so that passing or stopping of the reception signal can be selected by changing the application of the bias.
  • the lengths of the coaxial cables 20 and 30 are extremely short. In other words, it is advantageous to install the diodes close to directly above the closed-circle slot 12. Thus, the transmission loss can be decreased. Of course, it is possible to install the diodes in positions which are not directly above the closed-circle slot 12. Furthermore, it would also be possible to select the signal extraction position electronically by some method other than that described above.
  • the switch 40 is arranged so as to be switched automatically, it would be possible to arrange for manual operation of the switch 40.
  • the core conductors 21 and 31 of the coaxial cables 20 and 30 were connected to the edge portions of the central conductor 13. The reason for this is that the reception signal current is concentrated in the periphery or edge of the central conductor 13, especially in the case of the F frequency band, etc.
  • the closed-circle slot 12 is rectangular, the slot 12 could also be square, circular or elliptical in shape. Generally, the efficiency is better if the closed-circle slot is circular.
  • the lead-out positions of the coaxial cables 20 and 30 are installed on the right edge and lower edge of the central conductor 13 with respect to Fig. 1, they can be provided on the left edge and upper edge of the central conductor 13.
  • a reception sensitivity remains stable even if the direction of motion of the vehicle in question is frequently altered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Waveguide Aerials (AREA)
  • Details Of Aerials (AREA)

Claims (7)

  1. Ebene Schlitzantenne mit:
       einer äußeren Leiteroberfläche (11);
       einer mittleren Leiteroberfläche (13), die in der äußeren Leiteroberfläche mit einem dazwischenliegenden Raum (12) vorgesehen ist; und
       einer Mehrzahl von Koaxialleitungen (20,30), Mittenleitern (21,31) der Koaxialleitungen, die an verschiedenen Punkten auf der mittleren Leiteroberfläche an die mittlere Leiteroberfläche angeschlossen sind, und Außenschichten (22,32) der Koaxialleitungen, die an die äußere Leiteroberfläche angeschlossen sind; gekennzeichnet durch
       eine Umschalteeinrichtung, die zwischen den Koaxialleitungen und einem Signalempfänger vorgesehen ist, wobei die Umschalteeinrichtung eine Verbindung zwischen einer der Koaxialleitungen und dem Signalempfänger abhängig von mindestens entweder der Stärke oder der Phase des empfangenen Signals umschaltet.
  2. Ebene Schlitzantenne nach Anspruch 1, dadurch gekennzeichnet, daß sie desweiteren eine Erfassungseinrichtung aufweist, die die Stärke und Phase des empfangenen Signals so erfaßt, daß die Umschalteeinrichtung die Verbindung zwischen den Koaxialleitungen und dem Signalempfänger umschaltet.
  3. Ebene Schlitzantenne nach Anspruch 2, dadurch gekennzeichnet, daß die Erfassungseinrichtung eine Diode aufweist, die an jede Koaxialleitung (20,30) angeschlossen ist.
  4. Ebene Schlitzantenne nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Mittenleiter (21,31) der Koaxialleitungen (20,30) an Kantenbereiche des mittleren Leiters (13) angeschlossen sind.
  5. Ebene Schlitzantenne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichent, daß der Raum (12) quadratisch oder rechteckig ist.
  6. Ebene Schlitzantenne nach Anspruch 5, gekennzeichnet durch ein Beinhalten erster und zweiter Koaxialleitungen, wobei die Mittenleiter (21,31) und Außenschichten (22,32) der Koaxialleitungen über erste und zweite senkrechte Seiten des Raums (12) an die Leiteroberflächen (11,13) angeschlossen sind.
  7. Ebene Schlitzantenne nach Anspruch 1 oder 2, die erste und zweite Koaxialleitungen beinhaltet, dadurch gekennzeichnet, daß:
       die äußere Leiteroberfläche (11), die mittlere Leiteroberfläche (13) der Mittenleiter (21) und die Außenschicht (22) der ersten Koaxialleitung zusammen eine erste Schaltung bilden;
       die äußere Leiteroberfläche (11), die mittlere Leiteroberfläche (13), der Mittenleiter (31) und die Außenschicht (32) der zweiten Koaxialleitung zusammen eine zweite Schaltung bilden; und
       die Mittenleiter (21,31) und die Außenschichten (22,23) der Koaxialleitungen (20,30) derart an die äußere Leiteroberfläche (11) und die mittlere Leiteroberfläche (13) angeschlossen sind, daß die Richtungen, in denen die ersten und zweiten Schaltungen empfindlich auf Signale sind, zueinander senkrecht sind.
EP19890313427 1988-12-23 1989-12-21 Ebene Schlitzantenne Expired - Lifetime EP0375416B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP325505/88 1988-12-23
JP32550588A JPH02170702A (ja) 1988-12-23 1988-12-23 プレーンアンテナ

Publications (3)

Publication Number Publication Date
EP0375416A2 EP0375416A2 (de) 1990-06-27
EP0375416A3 EP0375416A3 (en) 1990-11-14
EP0375416B1 true EP0375416B1 (de) 1995-07-12

Family

ID=18177626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890313427 Expired - Lifetime EP0375416B1 (de) 1988-12-23 1989-12-21 Ebene Schlitzantenne

Country Status (4)

Country Link
EP (1) EP0375416B1 (de)
JP (1) JPH02170702A (de)
DE (1) DE68923440T2 (de)
ES (1) ES2076969T3 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355144A (en) * 1992-03-16 1994-10-11 The Ohio State University Transparent window antenna
KR0145052B1 (ko) * 1993-12-29 1998-08-01 와다 요시히로 차량용 안테나 및 그 설정방법
GB9813129D0 (en) * 1998-06-17 1998-08-19 Harada Ind Europ Limited Multiband vehicle screen antenna
GB9910246D0 (en) * 1999-05-05 1999-06-30 Asg Technology Limited Concealed radio atenna system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665480A (en) * 1969-01-23 1972-05-23 Raytheon Co Annular slot antenna with stripline feed
US4229744A (en) * 1979-03-14 1980-10-21 The United States Of America As Represented By The Field Operations Bureau Of The Federal Communications Commission Directional annular slot antenna
JPS583302A (ja) * 1981-06-29 1983-01-10 Mitsubishi Electric Corp 車載用アンテナ装置
US4737795A (en) * 1986-07-25 1988-04-12 General Motors Corporation Vehicle roof mounted slot antenna with AM and FM grounding
US4721963A (en) * 1986-07-25 1988-01-26 General Motors Corporation Vehicle roof mounted slot antenna with separate AM and FM feeds

Also Published As

Publication number Publication date
EP0375416A3 (en) 1990-11-14
DE68923440D1 (de) 1995-08-17
EP0375416A2 (de) 1990-06-27
JPH02170702A (ja) 1990-07-02
ES2076969T3 (es) 1995-11-16
DE68923440T2 (de) 1995-12-07

Similar Documents

Publication Publication Date Title
US4631546A (en) Electronically rotated antenna apparatus
EP0375415B1 (de) Ebene Schlitzantennen und deren Verwendung in Automobilen
US8188918B2 (en) Antenna system having a steerable radiation pattern based on geographic location
JPH09260925A (ja) アンテナ装置
CA2110712A1 (en) Telecommunications System Using Directional Antennas
DE3788954D1 (de) Kreisförmiger Streifenleiter als Antenne für ein Fahrzeug.
EP0762542A3 (de) Antennendiversity
US20080026705A1 (en) Digital Broadcast Receiving Antenna Apparatus and Movable Body Incorporating the Same
KR100302052B1 (ko) 차량용창유리안테나장치
EP0375416B1 (de) Ebene Schlitzantenne
EP0367555A3 (de) Empfangssystem auf Glasscheibe
JPS61210705A (ja) 自動車のダイバ−シテイ−アンテナ装置
EP0998058A3 (de) Scanning-Antennen-Diversity-System für Fahrzeuge
US4769655A (en) Vehicle slot antenna with passive ground element
US4091386A (en) Rear window direction finding antenna
CN212725547U (zh) 一种圆极化微带天线及obu装置及车辆玻璃
JPH10504955A (ja) アンテナ列を有する受信機
CN101542839B (zh) 测向天线系统及其使用方法
US6040799A (en) Beam steering antenna unit
JPH02186728A (ja) 選択指向性アンテナ
EP0831597A3 (de) Nachrichtenempfangssystem und dazugehöriges Steuerverfahren
EP0877440A1 (de) Antennendiversity mit veränderbarer Richtcharakteristik
US6774817B2 (en) Reflection multiplier radio wave marker system and traffic system
US20240079768A1 (en) Switching antenna for uwb communication for vehicle
KR940011485B1 (ko) 전방향성 루프 안테나

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900111

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE ES FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE ES FR GB IT SE

17Q First examination report despatched

Effective date: 19930603

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT SE

ITF It: translation for a ep patent filed

Owner name: BUGNION S.P.A.

ET Fr: translation filed
REF Corresponds to:

Ref document number: 68923440

Country of ref document: DE

Date of ref document: 19950817

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2076969

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20031114

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20031216

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20031217

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20031230

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20040226

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041222

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041222

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050701

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20041221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050831

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051221

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20041222