GB517342A - Improvements in or relating to antennas - Google Patents

Improvements in or relating to antennas

Info

Publication number
GB517342A
GB517342A GB21984/38A GB2198438A GB517342A GB 517342 A GB517342 A GB 517342A GB 21984/38 A GB21984/38 A GB 21984/38A GB 2198438 A GB2198438 A GB 2198438A GB 517342 A GB517342 A GB 517342A
Authority
GB
United Kingdom
Prior art keywords
wires
wire
wave
aerial
impedance
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
GB21984/38A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB517342A publication Critical patent/GB517342A/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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength

Landscapes

  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

517,342. Aerials. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 25, 1938, No. 21984. Convention date, July 24, 1937. [Class 40 (v)] A short-wave television aerial comprises a number of parallel conductors spaced apart by a small fraction of the operating wavelength, one free end being connected to the transmission line and the other being left open, or also connected to the line without the use of a terminating impedance. The arrangement presents a flat impedance over a wide range of frequencies without the use of a matching transformer. As shown in Fig. 1, the aerial consists of a closely-spaced pair of half-wave wires A, B connected together at both ends, the transmission line being directly coupled to a centre break in the wire B. The current distribution in each wire is shown in dotted lines, and is additive for the pair. For a given current, the radiation resistance of the two wires in parallel is four times that of a single dipole, thus giving the broad resonance and impedance characteristics required in television. Wires 3/4 or 5/4 of a wave in length can be used to present a higher impedance. The wire A may be broken in the centre, and the gap bridged by a quarter-wave loop. As shown in Fig. 8 three wires are used to give nine times the radiation resistance of a single dipole ; whilst the four-wire arrangement of Fig. 11 gives a 16 : 1 ratio. Fig. 14 shows an aerial assembly corresponding to Fig. 8. Specifications 424,698, and 438,326, are referred to. The Specification, as open to inspection under Sect. 91, comprises also an aerial in which a centre gap is bridged by a resistance ; this subject-matter does not appear in the Specification as accepted.
GB21984/38A 1937-07-24 1938-07-25 Improvements in or relating to antennas Expired GB517342A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US155385A US2283914A (en) 1937-07-24 1937-07-24 Antenna

Publications (1)

Publication Number Publication Date
GB517342A true GB517342A (en) 1940-01-26

Family

ID=22555213

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21984/38A Expired GB517342A (en) 1937-07-24 1938-07-25 Improvements in or relating to antennas

Country Status (2)

Country Link
US (1) US2283914A (en)
GB (1) GB517342A (en)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472106A (en) * 1943-09-20 1949-06-07 Sperry Corp Broad band antenna
US2505115A (en) * 1944-09-11 1950-04-25 Belmont Radio Corp Dipole antenna system
GB588044A (en) * 1944-10-31 1947-05-13 Standard Telephones Cables Ltd Improvements in aerial arrays
US2481801A (en) * 1945-12-08 1949-09-13 American Phenolic Corp Antenna array
US2566491A (en) * 1946-03-15 1951-09-04 Belmont Radio Corp Antenna construction
US2624000A (en) * 1946-05-03 1952-12-30 Rca Corp Antenna system
BE473382A (en) * 1946-05-21
US2494665A (en) * 1946-08-09 1950-01-17 Dielectric Products Company In Dipole antenna construction
US2578973A (en) * 1946-12-11 1951-12-18 Belmont Radio Corp Antenna array
US2611086A (en) * 1947-06-06 1952-09-16 Amy Aceves & King Inc Antenna system
BE488516A (en) * 1948-04-16
US2576748A (en) * 1948-05-15 1951-11-27 Gershom N Carmichael Antenna structure
US2558145A (en) * 1948-05-20 1951-06-26 Jr Wesley C Mock Antenna
US2647211A (en) * 1949-01-11 1953-07-28 Lynne C Smeby Radio antenna
US2596479A (en) * 1949-01-21 1952-05-13 Rca Corp Heat radiator and antenna
US2533900A (en) * 1949-09-09 1950-12-12 Collins Radio Co Antenna
US2598005A (en) * 1950-01-13 1952-05-27 Technical Appliance Corp High-gain directionalized antenna
US2682608A (en) * 1950-03-16 1954-06-29 Rca Corp Indoor television antenna
US2649545A (en) * 1951-02-28 1953-08-18 Zenith Radio Corp Loop antenna
US2749543A (en) * 1951-08-15 1956-06-05 Marvin P Middlemark Directional antenna systems
US2777123A (en) * 1952-10-30 1957-01-08 David E Shetron Television antenna
US2780808A (en) * 1953-12-15 1957-02-05 Marvin P Middlemark High frequency antennas
US2993206A (en) * 1959-01-22 1961-07-18 Lindsay Antenna And Specialty Multiband doublet antenna
US3229298A (en) * 1962-11-27 1966-01-11 Dean O Morgan Bent-arm multiband dipole antenna wherein overall dimension is quarter wavelength on low band
US3875572A (en) * 1973-04-23 1975-04-01 Kay Townes Inc Broad-band antenna having folded dipoles with hairpin transformers
US5892484A (en) * 1996-10-30 1999-04-06 Amplifier Research Corporation E-field generator
US7973731B2 (en) * 2008-05-23 2011-07-05 Harris Corporation Folded conical antenna and associated methods
US7864127B2 (en) * 2008-05-23 2011-01-04 Harris Corporation Broadband terminated discone antenna and associated methods
WO2011083502A1 (en) * 2010-01-05 2011-07-14 株式会社 東芝 Antenna and wireless device
US8450664B2 (en) 2010-07-13 2013-05-28 Harris Corporation Radio frequency heating fork
JP5172925B2 (en) 2010-09-24 2013-03-27 株式会社東芝 Wireless device
JP5417389B2 (en) 2011-07-13 2014-02-12 株式会社東芝 Wireless device
JP5414749B2 (en) 2011-07-13 2014-02-12 株式会社東芝 Wireless device
US9157304B2 (en) 2012-12-03 2015-10-13 Harris Corporation Hydrocarbon resource recovery system including RF transmission line extending alongside a well pipe in a wellbore and related methods
US9057241B2 (en) 2012-12-03 2015-06-16 Harris Corporation Hydrocarbon resource recovery system including different hydrocarbon resource recovery capacities and related methods
JP6121705B2 (en) 2012-12-12 2017-04-26 株式会社東芝 Wireless device

Also Published As

Publication number Publication date
US2283914A (en) 1942-05-26

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