EP0254415A1 - Antenna system - Google Patents

Antenna system Download PDF

Info

Publication number
EP0254415A1
EP0254415A1 EP87305421A EP87305421A EP0254415A1 EP 0254415 A1 EP0254415 A1 EP 0254415A1 EP 87305421 A EP87305421 A EP 87305421A EP 87305421 A EP87305421 A EP 87305421A EP 0254415 A1 EP0254415 A1 EP 0254415A1
Authority
EP
European Patent Office
Prior art keywords
loop
antenna
sections
loop antenna
antenna system
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.)
Withdrawn
Application number
EP87305421A
Other languages
German (de)
English (en)
French (fr)
Inventor
Roger British Aerospace plc Worth
David Alun British Aerospace plc Griffiths
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.)
BAE Systems PLC
Original Assignee
British Aerospace PLC
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 British Aerospace PLC filed Critical British Aerospace PLC
Publication of EP0254415A1 publication Critical patent/EP0254415A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01Q7/02—Collapsible antennas; Retractable antennas

Definitions

  • This invention relates to loop antennas and in particular but not exclusively to loop antennas which are collapsible.
  • ground wave propagation In the ground wave mode, propagation is typically up to about 30 km, and skywave mode propagation covers the range 100 km upwards. There is therefore a skip distance in the range 30 - 100 km where neither mode provides good communication.
  • current ground wave transmitters employ a whip antenna of 4 m or so mounted on a vehicle. Such antennas are susceptible to damage due to their height and furthermore may indicate the presence of an otherwise hidden vehicle.
  • Current skywave transmitters require that a half wave dipole wire antenna be erected, typically consisting of radiating elements some 150 metres long. It will be appreciated that this arrangement is difficult to erect quickly.
  • an antenna system comprises an antenna of loop form including a plurality of separable sections and means for applying an electrical drive signal across ends of the loop.
  • said sections are of a common unit length, and interconnected by several corner elements.
  • said loop antenna is of generally rectangular shape.
  • said loop antenna includes tuner apparatus connected thereto for matching the impedance of said loop with that of the signal transmitter.
  • the antenna system includes a rectangular loop antenna 10 which is made up of interchangeable sections 11 a-f of electrically conducting material.
  • the sections 11a-d are of common unit length, typically about 1 m long whilst the sections 11e and 11f are of different length.
  • Each of the sections 11a-f is adapted to allow end-to-end connection with another section.
  • respective ends of the sections are swaged to form reduced diameter portions which fit snugly within respective other ends of the adjacent section.
  • Electrically conducting corner pieces 12a-c connect adjacent ones of the sections 11a-f at 90° to each other.
  • Stands 13 are provided for supporting the loop antenna in a stable condition on the ground.
  • An automatic tuning unit 14 takes the place of a corner piece 12 and is connected between two sections 11e and 11f to allow the impedance of the loop antenna to be matched with that of the H.F. transceiver 15.
  • the system also includes an add-on interface 16 which is capable of tuning a range of existing whip antennas 17, 17' etc. when only short range ground wave communication is required.
  • a switch on the side of the interface unit 16 selects the correct whip configuration and the automatic tuning capability of the unit 14 tunes the configuration.
  • This combination of the loop and whip systems with a common tuning unit provides a capability for operation either on a vehicle or remote from it.
  • the need for antennas or conspicuous tall masts is removed by the use of the loop for frequencies about 10MHz.
  • the loop antenna will be disassembled and stored with the automatic tunign unit.
  • the antenna may be transported by one man.
  • the height and width dimensions of the loop may be adjusted in units of 1 m to suit the particular characteristics required.
  • the loop antenna may also be secured to a land or sea vehicle. In this case there is no need for the loop to be disassembled for storage. Instead it may form a permanent feature of the vehicle, for example, being attached to the side of the vehicle with the plane of the loop generally vertical.

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
EP87305421A 1986-06-20 1987-06-18 Antenna system Withdrawn EP0254415A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8615018 1986-06-20
GB868615018A GB8615018D0 (en) 1986-06-20 1986-06-20 Antennas

Publications (1)

Publication Number Publication Date
EP0254415A1 true EP0254415A1 (en) 1988-01-27

Family

ID=10599754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305421A Withdrawn EP0254415A1 (en) 1986-06-20 1987-06-18 Antenna system

Country Status (3)

Country Link
EP (1) EP0254415A1 (zh)
GB (1) GB8615018D0 (zh)
IN (1) IN169569B (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1053459A (fr) * 1952-04-05 1954-02-02 Antenne pour appareils de radio installés à bord des véhicules automobiles
US3174781A (en) * 1962-09-06 1965-03-23 Everett J Eastman Separable coupling
US4075634A (en) * 1977-01-10 1978-02-21 Edward Gutha Portable antenna assembly for television receiver
DE3023754A1 (de) * 1980-06-25 1982-01-14 Jürgen 5170 Jülich Keck Durch kondensatoren unterteilte ringantenne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1053459A (fr) * 1952-04-05 1954-02-02 Antenne pour appareils de radio installés à bord des véhicules automobiles
US3174781A (en) * 1962-09-06 1965-03-23 Everett J Eastman Separable coupling
US4075634A (en) * 1977-01-10 1978-02-21 Edward Gutha Portable antenna assembly for television receiver
DE3023754A1 (de) * 1980-06-25 1982-01-14 Jürgen 5170 Jülich Keck Durch kondensatoren unterteilte ringantenne

Also Published As

Publication number Publication date
IN169569B (zh) 1991-11-09
GB8615018D0 (en) 1986-11-26

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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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19880714

17Q First examination report despatched

Effective date: 19891123

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19910416

R18W Application withdrawn (corrected)

Effective date: 19910416

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GRIFFITHS, DAVID ALUNBRITISH AEROSPACE PLC

Inventor name: WORTH, ROGERBRITISH AEROSPACE PLC