GB677860A - Antenna of small dimensions - Google Patents

Antenna of small dimensions

Info

Publication number
GB677860A
GB677860A GB18895/50A GB1889550A GB677860A GB 677860 A GB677860 A GB 677860A GB 18895/50 A GB18895/50 A GB 18895/50A GB 1889550 A GB1889550 A GB 1889550A GB 677860 A GB677860 A GB 677860A
Authority
GB
United Kingdom
Prior art keywords
antenna
dipole
rods
wavelength
plane
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
GB18895/50A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB677860A publication Critical patent/GB677860A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
    • H01Q3/14—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying the relative position of primary active element and a refracting or diffracting device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators

Landscapes

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

Abstract

677,860. Aerials. STANDARD TELEPHONES & CABLES, Ltd. July 28, 1950 [Nov. 19, 1949], No. 18895/50. Class 40 (vii). A radio antenna assembly comprises a radiating antenna of small length relative to half a wavelength at the operating frequency enclosed within a structure which although surrounding the antenna allows the passage of radiation in one plane. The antenna may comprise a dipole of the order of a tenth of a wavelength long which is easy to rotate at high speeds owing to its small physical size but which will, by itself, have a very low radiation resistance. The enclosing structure increases the effective radiation resistance of the antenna, enabling it to be matched to its feeder. It may consist of an open wire cage made of rods 6 perpendicular to the plane of polarization of the dipole 2 secured at the top and bottom to plane conductive discs 5 and 4. The rods are spaced closely enough to form a polarization grating to filter the vertically polarized components and pass the horizontally polarized energy. Matching is only completely achieved at one frequency but the assembly is effective over a relatively wide band-width. In an example, where the dipole was of 30 degrees electrical length at 800 Mc/s. the spacing between the plates and diameter of the plates was made half a wavelength and twenty uniformly spaced rods were used.
GB18895/50A 1949-11-19 1950-07-28 Antenna of small dimensions Expired GB677860A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US128332A US2774967A (en) 1949-11-19 1949-11-19 Balanced doublet antenna of small dimension

Publications (1)

Publication Number Publication Date
GB677860A true GB677860A (en) 1952-08-20

Family

ID=22434820

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18895/50A Expired GB677860A (en) 1949-11-19 1950-07-28 Antenna of small dimensions

Country Status (5)

Country Link
US (1) US2774967A (en)
BE (1) BE499425A (en)
CH (1) CH298003A (en)
FR (1) FR1027809A (en)
GB (1) GB677860A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132022A (en) * 1982-05-21 1984-06-27 Decca Ltd Radio frequency antenna and radio direction finding apparatus incorporating such antenna

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI80346C (en) * 1983-07-07 1990-05-10 Instrumentarium Oy RF-SPOLARRANGEMANG VID NMR-UNDERSOEKNINGSAPPARATUR.
US4694255A (en) * 1983-11-04 1987-09-15 General Electric Company Radio frequency field coil for NMR
US4692705A (en) * 1983-12-23 1987-09-08 General Electric Company Radio frequency field coil for NMR

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE636809C (en) * 1930-08-08 1936-10-17 Rudolf Weyrich Dr Device for transmitting or receiving electromagnetic waves with reflectors arranged in the vicinity of a transmitting or receiving device
US2415094A (en) * 1938-01-17 1947-02-04 Board Radio measurement of distances and velocities
GB550127A (en) * 1940-12-12 1942-12-23 Marconi Wireless Telegraph Co Improvements in electromagnetic tapered wave-guide radiators
US2359620A (en) * 1942-06-13 1944-10-03 Rca Corp Short wave antenna
US2465416A (en) * 1943-10-02 1949-03-29 Zenith Radio Corp Resonant circuit and radiator
US2418084A (en) * 1945-11-05 1947-03-25 United Air Lines Inc Antenna
US2539680A (en) * 1945-11-26 1951-01-30 Rca Corp Ultra high frequency antenna
US2532919A (en) * 1947-04-21 1950-12-05 Johnson William Arthur Radio aerial system, and particularly directive aerial system
US2572041A (en) * 1947-10-29 1951-10-23 Sperry Corp Selective azimuth signaling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132022A (en) * 1982-05-21 1984-06-27 Decca Ltd Radio frequency antenna and radio direction finding apparatus incorporating such antenna

Also Published As

Publication number Publication date
US2774967A (en) 1956-12-18
FR1027809A (en) 1953-05-15
CH298003A (en) 1954-04-15
BE499425A (en)

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