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US 5,305,001 AGranted
Horn radiator assembly with stepped septum polarizer
AssigneeHughes Aircraft Company
InventorsMon N. Wong, Gregory D. Kroupa
Life of this patent
Estimating the term…
Abstract
A circularly polarized wave entering the horn is converted to a linearly polarized wave which appears in one of the ports depending on the sense of the polarization. The stepped configuration of the impedance matching section minimizes mutual coupling among horns of the respective assemblies of the array antenna.
Claims11
A horn radiator assembly comprising:
- a waveguide section having a front end and a back end and being of square cross-section, said waveguide section having a top wall and a bottom wall, there being a middle portion of said waveguide section located between said front end and said back end;
- a septum upstanding from said bottom wall within said waveguide section, said septum extending from said middle portion of said waveguide section in longitudinal direction toward said back end and increasing in height stepwise with progression toward said back end, a maximum height of said septum extending from said bottom wall to said top wall enabling said septum to bisect a portion of said waveguide section into first and second waveguide ports of rectangular cross section;
- a circular cylindrical horn having a front end and a back end spaced apart along a longitudinal axis of said horn, a radiating aperture being located at said front end of said horn, said back end of said horn being coupled to said front end of said waveguide section;
- and
- wherein a circularly polarized wave entering said radiator assembly via said horn exits said radiator assembly as a linearly polarized wave via said first port for right-handed circular polarization and via said second port for left-handed circular polarization of said circularly polarized wave.
2 more elements
An array antenna comprising a beamformer and a plurality of horn radiator assemblies coupled to said beamformer, each of said horn radiator assemblies comprising:
- a waveguide section having a front end and a back end and being of square cross-section, said waveguide section having a top wall and a bottom wall, there being a middle portion of said waveguide section located between said front end and said back end;
- a septum upstanding from said bottom wall within said waveguide section, said septum extending from said middle portion of said waveguide section in longitudinal direction toward said back end and increasing in height stepwise with progression toward said back end, a maximum height of said septum extending from said bottom wall to said top wall enabling said septum to bisect a portion of said waveguide section into first and second waveguide ports of rectangular cross section;
- and
- a circular cylindrical horn having a front end and a back end spaced apart along a longitudinal axis of said horn, a radiating aperture being located at said front end of said horn, said back end of said horn being coupled to said front end of said waveguide section.
1 more element
Dependencies are inferred from the claim text.