GB1235191A - Improvements in or relating to aerials of adjustable resonant frequency - Google Patents

Improvements in or relating to aerials of adjustable resonant frequency

Info

Publication number
GB1235191A
GB1235191A GB792568A GB792568A GB1235191A GB 1235191 A GB1235191 A GB 1235191A GB 792568 A GB792568 A GB 792568A GB 792568 A GB792568 A GB 792568A GB 1235191 A GB1235191 A GB 1235191A
Authority
GB
United Kingdom
Prior art keywords
slot
open
aerial
slug
bosses
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
GB792568A
Inventor
Donald Norfolk Biltcliffe
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.)
Airtech Ltd
Original Assignee
Airtech 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 Airtech Ltd filed Critical Airtech Ltd
Priority to GB792568A priority Critical patent/GB1235191A/en
Publication of GB1235191A publication Critical patent/GB1235191A/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
    • H01Q9/30—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

Landscapes

  • Insulators (AREA)

Abstract

1,235,191. Aerials. AIRTECH Ltd. 11 Feb., 1969 [19 Feb., 1968], No. 7925/68. Heading H4A. In a notch, or open-ended slot aerial 10, Fig. 1, a plate 13 extends perpendicularly from a base 11, strengthening ribs (e.g. 15) are provided on each side, and a parallel-sided slot 18 extends from the front end of said plate almost to said ribs. Pairs of opposed bosses 23, 24 and 25, 26 are provided near the open and the closed ends of the slot 18, respectively. A socket fitting on the underside of the base 10 comprises a fixing plate 33 and a threaded portion 34, and it is connected to the upper part of the slot 18 by a cable 32 which passes through the bosses 25, 26. The cable 32 is surrounded by a tubular feed insulator 35 which is itself surrounded by an upper feed insulator 36 and a lower feed insulator 37. The insulator 36 is secured to the faces of the slot by means of epoxy resin. At the open end of the slot 18 an insulating tube 28, which is coaxial with the bosses 23, 24, extends across the said slot and is likewise secured to its faces by means of epoxy resin. The tube 28 contains an upper slug 27, which is fixed to the boss 23, and a lower slug 31, which is adjustable for . tuning purposes by means of a threaded portion 30 which engages with a threaded hole 29 in the boss 24. After adjustment, the open end of the hole below the slug 31 is sealed flush. The aerial is stated to be particularly suitable for fixing to road and rail vehicles, where it can withstand rough usage. A closed slot may be used instead of an open slot, the aerial being otherwise as described above. .
GB792568A 1968-02-19 1968-02-19 Improvements in or relating to aerials of adjustable resonant frequency Expired GB1235191A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB792568A GB1235191A (en) 1968-02-19 1968-02-19 Improvements in or relating to aerials of adjustable resonant frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB792568A GB1235191A (en) 1968-02-19 1968-02-19 Improvements in or relating to aerials of adjustable resonant frequency

Publications (1)

Publication Number Publication Date
GB1235191A true GB1235191A (en) 1971-06-09

Family

ID=9842421

Family Applications (1)

Application Number Title Priority Date Filing Date
GB792568A Expired GB1235191A (en) 1968-02-19 1968-02-19 Improvements in or relating to aerials of adjustable resonant frequency

Country Status (1)

Country Link
GB (1) GB1235191A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553586A1 (en) * 1983-10-13 1985-04-19 Applic Rech Electronique Half-loop antenna with automatic tuning over a wide band

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2553586A1 (en) * 1983-10-13 1985-04-19 Applic Rech Electronique Half-loop antenna with automatic tuning over a wide band

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