GB608506A - Improvements in antenna - Google Patents

Improvements in antenna

Info

Publication number
GB608506A
GB608506A GB31409/45A GB3140945A GB608506A GB 608506 A GB608506 A GB 608506A GB 31409/45 A GB31409/45 A GB 31409/45A GB 3140945 A GB3140945 A GB 3140945A GB 608506 A GB608506 A GB 608506A
Authority
GB
United Kingdom
Prior art keywords
line
bore
order
impedance
quarter
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
GB31409/45A
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 GB608506A publication Critical patent/GB608506A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
    • H01Q21/205—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path providing an omnidirectional coverage

Landscapes

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

Abstract

608,506. High-frequency transmission lines. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Nov. 21, 1945, No. 31409. Convention date, July 25, 1944. Drawings to Specification. [Class 40 (iv)] [Also in Group XL (c)] An aerial array comprising a plurality of dipoles fed effectively in parallel is mounted on a metallic mast with a cylindrical longitudinal bore through which a central conductor extends coaxially; the central conductor and the wall of the bore forming the feeding transmission line. In order to avoid excitation of the line in undesirable modes, #/2 times the sum of the diameter of the bore and the diameter of the inner conductor must be less than one wavelength of the frequency of operation. Tubular spacers of insulating material are used in the line and are made half-a-wavelength long at the velocity of propogation through the insulating material in order to prevent reflection. In order to match the comparatively low impedance of the aerial array to that of the line a conductive sleeve one-quarter of the wavelength long engaging the inner conductor and cooperating with the wall of the bore to form a line section with an impedance less than that of the line is used. Owing to the impedance inversion characteristics of quarter-wave lines this section operates as a transformer to provide the desired matching.
GB31409/45A 1944-07-25 1945-11-21 Improvements in antenna Expired GB608506A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US546449A US2471515A (en) 1944-07-25 1944-07-25 Antenna

Publications (1)

Publication Number Publication Date
GB608506A true GB608506A (en) 1948-09-16

Family

ID=24180466

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31409/45A Expired GB608506A (en) 1944-07-25 1945-11-21 Improvements in antenna

Country Status (2)

Country Link
US (1) US2471515A (en)
GB (1) GB608506A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518321A1 (en) * 1981-12-15 1983-06-17 Thomson Csf RADIANT ASSEMBLY WITH TWO SUPERPOSED ANTENNAS WORKING IN THE SAME RANGE OF FREQUENCIES

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2566703A (en) * 1947-05-14 1951-09-04 Rca Corp Radio wave focusing device
US2658143A (en) * 1950-03-16 1953-11-03 Rca Corp Ultrahigh-frequency broadcast antenna system
US2691102A (en) * 1950-08-14 1954-10-05 Rca Corp High gain vhf antenna system
US2714706A (en) * 1951-07-23 1955-08-02 Univ Ohio State Res Found Power equalizer
US2808585A (en) * 1952-06-11 1957-10-01 Andrew Corp Skew antenna system
US2888677A (en) * 1953-12-31 1959-05-26 Rca Corp Skewed antenna array
US3019438A (en) * 1957-03-18 1962-01-30 Gen Electric Antenna structure
US3394379A (en) * 1965-10-18 1968-07-23 Navy Usa Dual band stationary tacan antenna

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2183784A (en) * 1935-01-04 1939-12-19 Rca Corp Directional antenna
US2199635A (en) * 1939-03-31 1940-05-07 Rca Corp Ultra high frequency antenna
BE472233A (en) * 1939-07-26
US2269991A (en) * 1940-03-08 1942-01-13 Gen Electric High frequency transmission line
US2289856A (en) * 1940-09-25 1942-07-14 Internat Telephone & Eadio Mfg Broadcasting antenna system
US2267550A (en) * 1940-10-31 1941-12-23 Rca Corp Turnstile antena
US2298449A (en) * 1941-11-08 1942-10-13 Bell Telephone Labor Inc Antenna
BE471543A (en) * 1943-11-10

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518321A1 (en) * 1981-12-15 1983-06-17 Thomson Csf RADIANT ASSEMBLY WITH TWO SUPERPOSED ANTENNAS WORKING IN THE SAME RANGE OF FREQUENCIES
EP0082053A1 (en) * 1981-12-15 1983-06-22 Thomson-Csf Radiating system comprising two stacked antennas working in the same frequency band

Also Published As

Publication number Publication date
US2471515A (en) 1949-05-31

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