Dual band satellite communications antenna system with circular polarzation
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorRichard A. Allnutt
Life of this patent
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Abstract
A hand-held dual frequency satellite communication antenna of circular polarization-capable characteristics is disclosed. The antenna system is based on Yagi/Udi spaced elements, including tuned trap-enabled dual frequency elements, disposed in orthogonal planes of a hand-receivable antenna boom element. The antenna system is fabricated from low cost readily obtainable materials and in a manner permitting easy disassembly and packaging for carriage to an isolated location of usage. Configuration of the disclosed antenna system for transmission and reception in two different popular amateur radio satellite communication bands is included. Antenna system field pattern characteristics and actual element lengths are included in the disclosure.
Claims18
Dual band circular polarization-capable portable antenna apparatus comprising the combination of:
- an ultra high radio frequency first array of dipolar antenna elements disposed in a first geometric plane and extending along an antenna boom member in ultra high radio frequency Yagi/Uda element separations;
- said ultra high radio frequency first array of dipolar antenna elements including an ultra high radio frequency energy radiator element disposed intermediate an ultra high radio frequency reflector element and a plurality of ultra high radio frequency director elements along said antenna boom member;
- an ultra high radio frequency and very high radio frequency second array of dipolar antenna elements extending in ultra high radio frequency Yagi/Uda element separations along said antenna boom member within a second geometric plane orthogonal of and coaxial of said first geometric plane;
- said ultra high radio frequency and very high radio frequency second array of dipolar antenna elements including an ultra high radio frequency energy radiator element disposed intermediate an ultra high radio frequency reflector element and a plurality of director elements, including dual radio frequency wavelength director elements of combined very high radio frequency and tuned wave-trap limited ultra high radio frequency effective electrical lengths, along said antenna boom member;
- said dual radio frequency director elements of combined very high radio frequency and tuned wave-trap limited ultra high radio frequency effective electrical lengths additionally comprising a very high radio frequency-tuned antenna energy radiator element and a very high radio frequency-tuned antenna director element;
- said ultra high radio frequency and very high radio frequency second array of dipolar antenna elements extending in said second geometric plane along said antenna boom member in interspersed antenna elements relationship with said first geometric plane first array of ultra high radio frequency dipolar antenna elements;
- and
- an electrical signal frequency responsive and signal phase splitting electrical network apparatus disposed intermediate an electrical port of said circularly polarized portable antenna apparatus and each of said antenna energy radiator elements;
- said signal phase splitting electrical network of said electrical signal frequency responsive and signal phase splitting electrical network apparatus having output signal ports connecting with said ultra high radio frequency energy radiator elements of said first and second arrays of dipolar antenna elements in circular polarized wave generating element phasing determination.
Hand-held circular polarization inclusive dual frequency band satellite communication antenna apparatus comprising the combination of:
- a first array of dipolar electrical radiation elements located in a first plane radially disposed with respect to an antenna longitudinal axis;
- said first array of dipolar electrical radiation elements including a first active radiating element and a plurality of passive director-reflector electrical elements each tuned to first frequency band electrical lengths and dispersed along said antenna longitudinal axis;
- a second array of dipolar electrical radiation elements located in a second plane radially disposed with respect to said antenna longitudinal axis and orthogonally disposed around said longitudinal axis with respect to said first plane;
- said second array of dipolar electrical elements including a pair of active radiating elements and a plurality of passive director-reflector electrical elements each tuned to first frequency band electrical length and dispersed along said antenna longitudinal axis;
- said second array of dipolar electrical elements also including a plurality of doubly tuned, electrically resonant trap-inclusive, dipolar electrical elements of combined first frequency and lower second frequency electrical wavelengths lengths;
- and
- an electrical energy coupling network connected with said active radiating elements and with an electrical energy port of said antenna apparatus;
- said electrical energy coupling network including electrical energy dividing and electrical energy phasing portions.
Dependencies are inferred from the claim text.