GB1007896A - Tunable aerials - Google Patents

Tunable aerials

Info

Publication number
GB1007896A
GB1007896A GB7464/61A GB746461A GB1007896A GB 1007896 A GB1007896 A GB 1007896A GB 7464/61 A GB7464/61 A GB 7464/61A GB 746461 A GB746461 A GB 746461A GB 1007896 A GB1007896 A GB 1007896A
Authority
GB
United Kingdom
Prior art keywords
coil
aerial
housing
wound
fibre glass
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
Application number
GB7464/61A
Inventor
Roy Ritchie
John Roy Killeen
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Priority to GB7464/61A priority Critical patent/GB1007896A/en
Priority to US175997A priority patent/US3226725A/en
Publication of GB1007896A publication Critical patent/GB1007896A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • H01Q9/145—Length of element or elements adjustable by varying the electrical length

Landscapes

  • Control Of Motors That Do Not Use Commutators (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

1,007,896. Inductors. PYE Ltd. Feb.27, 1962 [March 1, 1961], No. 7464/61. Heading H1T. [Also in Division H3 and H4] The invention relates to tuning an aerial (see Division H4) by means of an adjustable coil or coils 31, 32 within a fibre glass housing 2 and connected in series between a whip aerial element 1 and a further radiating element. In the embodiment shown, a plurality of adjoining ferrite blocks 25 held together by resilient pads 26 are enclosed within that part of the threaded fibre glass tube 24 on which the coil 31 is wound whilst the coil 32 is wound on a part of the threaded tube 24 (or rod) which has a metallized non-magnetic surface 30. The coils 31 and 32 are joined by conductor 29 which passes through nylon nuts 28. Each nut 28 is provided with a projection (not shown) which slides in a longitudinal slot in the wall of the housing 2. As the tube 24 is rotated by drive means 14, turns are removed from one coil and replaced on the other thus changing the resonant frequency of the aerial. In a similar embodiment (Fig. 1, not shown) only one coil and one nylon nut are provided, the coil being wound directly on to the fibre glass former. When the former is rotated, to add or subtract turns from the coil and the slack in the coil being taken up by a tensioned roller. In a further embodiment (Fig. 3 not shown) a fixed coil is formed from part of a copper tape extending between the ends of the housing and embedded therein or formed on the inner wall thereof. This coil is associated with two movable cores, one ferromagnetic and one of conductive paramagnetic or diamagnetic material. The cores are moved by a cable acting against a control spring. In this embodiment the housing is filled with oil and alumina. In each embodiment the tuning may be metered by means of a current transformer (the ferrite core of which is placed around the feeder to the aerial). After rectification this transformer output may be used to give a visual indication on a meter or to drive the means by which the inductance is varied.
GB7464/61A 1961-03-01 1961-03-01 Tunable aerials Expired GB1007896A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB7464/61A GB1007896A (en) 1961-03-01 1961-03-01 Tunable aerials
US175997A US3226725A (en) 1961-03-01 1962-02-27 Centrally loaded inductively tunable whip antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7464/61A GB1007896A (en) 1961-03-01 1961-03-01 Tunable aerials

Publications (1)

Publication Number Publication Date
GB1007896A true GB1007896A (en) 1965-10-22

Family

ID=9833593

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7464/61A Expired GB1007896A (en) 1961-03-01 1961-03-01 Tunable aerials

Country Status (2)

Country Link
US (1) US3226725A (en)
GB (1) GB1007896A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135147A (en) * 1983-02-15 1984-08-22 Imp Clevite Inc Radio circuit

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417403A (en) * 1965-11-18 1968-12-17 Collins Radio Co Electrically small spiral antenna tunable over a wide band
US3419874A (en) * 1965-12-10 1968-12-31 Collins Radio Co Mechanical tuning arrangement for dual helix winding antenna (compact antenna, 30-76 megacycles)
US3541554A (en) * 1967-10-09 1970-11-17 Coil Research L Tunable whip antenna
US3474453A (en) * 1968-07-10 1969-10-21 Frank E Ireland Whip antenna with adjustable tuning
US3671972A (en) * 1970-01-07 1972-06-20 Spilsbury Ashton J Adjustable center loaded antenna arrangement
ES8404573A1 (en) * 1982-11-16 1983-11-01 Bel Moratalla Joaquin Tunable antenna with variable series L-C network
US4725845A (en) * 1986-03-03 1988-02-16 Motorola, Inc. Retractable helical antenna
US5274393A (en) * 1991-09-23 1993-12-28 Allied-Signal Inc. Adjustable helical antenna for a VHF radio
US7176840B1 (en) 2005-04-08 2007-02-13 Michael Peter Kelley Variable spacing inductance coil apparatus and method
JP5587304B2 (en) * 2008-06-05 2014-09-10 クゥアルコム・インコーポレイテッド Ferrite antenna for wireless power transmission
US8259025B2 (en) * 2009-03-26 2012-09-04 Laird Technologies, Inc. Multi-band antenna assemblies
RU2488927C1 (en) * 2012-03-16 2013-07-27 Научно-Производственное Общество С Ограниченной Ответственностью "Кв-Связь" Tunable resonant antenna with matching device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2232693A (en) * 1937-03-18 1941-02-25 Jennings B Dow Antenna system
US2875443A (en) * 1954-06-21 1959-02-24 Itt Antenna
US2894260A (en) * 1958-04-15 1959-07-07 Glenn R Ellis Variable loaded whip antenna
US2931034A (en) * 1958-07-07 1960-03-29 Avco Mfg Corp Variable inductance for loading antenna
US3085215A (en) * 1960-02-15 1963-04-09 Jr Howard F Shepherd Precision variable winding impedance
US3104394A (en) * 1960-12-07 1963-09-17 Torio Company Ltd Telescoping antenna which collapses through centrally mounted loading coil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135147A (en) * 1983-02-15 1984-08-22 Imp Clevite Inc Radio circuit

Also Published As

Publication number Publication date
US3226725A (en) 1965-12-28

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