GB663166A - Improvements in or relating to antenna - Google Patents

Improvements in or relating to antenna

Info

Publication number
GB663166A
GB663166A GB596448A GB596448A GB663166A GB 663166 A GB663166 A GB 663166A GB 596448 A GB596448 A GB 596448A GB 596448 A GB596448 A GB 596448A GB 663166 A GB663166 A GB 663166A
Authority
GB
United Kingdom
Prior art keywords
reflector
system
paraboloidal
mirror
guide
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
GB596448A
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.)
US Departament of Commerce
Original Assignee
US Departament of Commerce
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
Priority to US617318A priority Critical patent/US2671855A/en
Application filed by US Departament of Commerce filed Critical US Departament of Commerce
Publication of GB663166A publication Critical patent/GB663166A/en
Application status is Expired legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/02Details
    • H01Q19/021Means for reducing undesirable effects
    • H01Q19/025Means for reducing undesirable effects for optimizing the matching of the primary feed, e.g. vertex plates

Abstract

663,166. Aerials. DEPARTMENT OF COMMERCE, DIRECTOR OF THE OFFICE OF TECHNICAL SERVICES OF. Feb. 27, 1948 [Sept. 19, 1945], No. 5964/48. Class 40 (vii). A broad band antenna system comprises a primary element and a reflector together with a further element positioned to alter the phase of some of the energy reflected back to the primary element relative to the rest so that the primary element is more closely matched to the system. It is stated that such a system is less frequency sensitive than previous arrangements and can handle a wider frequency band. The system may comprise a waveguide fed dipole 13 in a paraboloidal reflector 10 (shown cut away). A disc 14 reflects energy back to the reflector 10 and resonator 15 prevents coupling to the outside of the guide. Between the dipole and the reflector an annular disc 16 is placed on the guide at approximately an eighth of a wavelength in front of the reflector and of such size that the amount of energy reflected back into the aerial feed therefrom counterbalances that from the reflector 10. The size and precise position of the reflector 16 may be determined by experiment, it need not be circular or flat but may, for example, be elliptical in outline or paraboloidal in shape. In another embodiment, Fig. 2 (not shown), a wave-guide horn directs energy into a paraboloidal mirror the centre portion of which is covered by a reflecting element placed approximately an eighth of a wavelength in front of it and fulfilling the same purpose as the element 16 in Fig. 1. By moving the compensating reflector an integral multiple of half wavelengths nearer the radiator the increase in the side lobe energy caused by its insertion is reduced, on the other hand the band width is also reduced. A compromise is to have a series of reflectors of increasing size, Fig. 3 (not shown), spaced a half wavelength apart, the final and largest one being an eighth of a wavelength from the paraboloidal reflector. A system producing a horizontally polarized beam sharp in the horizontal plane, Fig. 4 (not shown), may consist of a waveguide fed mirror comprising a portion of a paraboloid as cut by two parallel horizontal planes parallel to the axis, the centre portion of the mirror carrying an auxiliary reflector spaced in front of it or an auxiliary reflector supported by the wave-guide being arranged to lie in a similar position. This reflector is made small in the horizontal direction. The system, or the mirror only, may be pivotally mounted to change the direction of the antenna radiation.
GB596448A 1945-09-19 1948-02-27 Improvements in or relating to antenna Expired GB663166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US617318A US2671855A (en) 1945-09-19 1945-09-19 Antenna

Publications (1)

Publication Number Publication Date
GB663166A true GB663166A (en) 1951-12-19

Family

ID=24473149

Family Applications (1)

Application Number Title Priority Date Filing Date
GB596448A Expired GB663166A (en) 1945-09-19 1948-02-27 Improvements in or relating to antenna

Country Status (2)

Country Link
US (1) US2671855A (en)
GB (1) GB663166A (en)

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