GB675245A - Improvements in or relating to radio antenn? - Google Patents

Improvements in or relating to radio antenn?

Info

Publication number
GB675245A
GB675245A GB1432350A GB1432350A GB675245A GB 675245 A GB675245 A GB 675245A GB 1432350 A GB1432350 A GB 1432350A GB 1432350 A GB1432350 A GB 1432350A GB 675245 A GB675245 A GB 675245A
Authority
GB
United Kingdom
Prior art keywords
apex
displacement
reflected back
displaced
reflector
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
GB1432350A
Inventor
Leonard Lewin
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
Priority to GB1432350A priority Critical patent/GB675245A/en
Priority to FR1046613D priority patent/FR1046613A/en
Publication of GB675245A publication Critical patent/GB675245A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave
    • H01Q19/13—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination

Abstract

675,245. Aerials. STANDARD TELEPHONES & CABLES, Ltd. June 8, 1950, No. 14323/50. Class 40 (vii). In a directional aerial system comprising a paraboloidal reflector 1 fed at the focus by a waveguide horn 2, mismatch due to energy reflected back to the horn is minimized by displacing a circular apex portion 4, 5 of the reflector along the axis of the system to a position 6, 7 so that the energy reflected back to the form from the displaced apex portion substantially cancels that reflected back from the other portions of the reflector over a relatively wide frequency band. The Specification shows that optimum cancellation is effected when b=#f#/3 and d=(n+1/12)# where b is the radius of the displaced portion, d is the displacement, f is the focal length of the paraloloid, A is the operating wavelength and n is an integer. In order to avoid distortion of the main radiation pattern, d should be as small as possible, i.e. n=o. As shown, the apex portion is displaced towards the focus but the displacement may be in the reverse direction. The displacement may be effected by mounting on the apex a circular plate of thickness d formed to the same curvature as the apex or by spacing a similarly shaped thin plate by brackets, or adjustable supports. Specification 581,457 is referred to.
GB1432350A 1950-06-08 1950-06-08 Improvements in or relating to radio antenn? Expired GB675245A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1432350A GB675245A (en) 1950-06-08 1950-06-08 Improvements in or relating to radio antenn?
FR1046613D FR1046613A (en) 1950-06-08 1951-06-08 Adaptation system of a radiator horn to a reflecting mirror

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1432350A GB675245A (en) 1950-06-08 1950-06-08 Improvements in or relating to radio antenn?

Publications (1)

Publication Number Publication Date
GB675245A true GB675245A (en) 1952-07-09

Family

ID=10039118

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1432350A Expired GB675245A (en) 1950-06-08 1950-06-08 Improvements in or relating to radio antenn?

Country Status (2)

Country Link
FR (1) FR1046613A (en)
GB (1) GB675245A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2778016A (en) * 1953-01-23 1957-01-15 Gabriel Co Wave guide antenna
US2887683A (en) * 1952-12-22 1959-05-19 Motorola Inc Antenna system
US2942266A (en) * 1957-07-16 1960-06-21 Bell Telephone Labor Inc Antenna with means for preventing re-radiation into feed guide
US3176301A (en) * 1963-02-14 1965-03-30 Richard S Wellons Plural horns at focus of parabolic reflector with shields to reduce spillover and side lobes
US3216018A (en) * 1962-10-12 1965-11-02 Control Data Corp Wide angle horn feed closely spaced to main reflector
DE1297708B (en) * 1965-06-11 1969-06-19 Siemens Ag Directional antenna for very short electromagnetic waves

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2887683A (en) * 1952-12-22 1959-05-19 Motorola Inc Antenna system
US2778016A (en) * 1953-01-23 1957-01-15 Gabriel Co Wave guide antenna
US2942266A (en) * 1957-07-16 1960-06-21 Bell Telephone Labor Inc Antenna with means for preventing re-radiation into feed guide
US3216018A (en) * 1962-10-12 1965-11-02 Control Data Corp Wide angle horn feed closely spaced to main reflector
US3176301A (en) * 1963-02-14 1965-03-30 Richard S Wellons Plural horns at focus of parabolic reflector with shields to reduce spillover and side lobes
DE1297708B (en) * 1965-06-11 1969-06-19 Siemens Ag Directional antenna for very short electromagnetic waves

Also Published As

Publication number Publication date
FR1046613A (en) 1953-12-08

Similar Documents

Publication Publication Date Title
US20190051990A1 (en) Horn antenna
GB647890A (en) Directional antenna systems
GB263753A (en) Directive projecting and receiving system for use in wireless telegraphy or telephony
GB1378114A (en) Antenna system
GB973583A (en) Improvements in or relating to microwave aerials
GB1513521A (en) Selective gain reduction antenna
GB675245A (en) Improvements in or relating to radio antenn?
US2767396A (en) Directive antenna systems
US2998602A (en) Energy decoupling of closely spaced radar antenna horns
GB613508A (en) Unidirectional antenna system
GB755011A (en) Improvements relating to radio beam antenna arrangements
US2556087A (en) Directive antenna system
GB978509A (en) Improvements in and relating to aerials
GB708614A (en) Microwave antenna
JPS5547743A (en) Communication system for mobile body
US2644092A (en) Antenna
JPS5773506A (en) Common antenna for multifrequency band
GB818661A (en) Improvements in feed systems for broad band antenna
US2607010A (en) Wave guide antenna system
GB504507A (en) Systems of guiding by radio-electric waves, particularly for guiding aeroplanes in altitude
GB800466A (en) Improvements in or relating to very short wave directional aerial systems
US3224006A (en) Horn reflector antenna with concentric conical reflectors at mouth to increase effective aperture
US2567746A (en) Antenna
US2785398A (en) Radio antennae
GB901005A (en) Improvements in or relating to a parabolic reflector antenna for waves polarized in two directions