Waveguide crescent slot array for low-loss, low-profile...

Details Waveguide crescent slot array for low-loss, low-profile... Waveguide crescent slot array for low-loss, low-profile...

2006-01-31

2008-10-14

Phan, Tho G (Department: 2821)

Communications: radio wave antennas

Antennas

Slot type

C343S770000

Reexamination Certificate

active

07436371

ABSTRACT:
A low-loss, low-profile dual-polarization slotted waveguide antenna includes one or more waveguides having a characteristic wavelength. Radiation apertures comprised of a waveguide slot pairs are formed in each or the waveguides of the antenna. Each waveguide slot pair includes a first waveguide slot and a second waveguide slot which are configured for inducing a circularly polarized (CP) radiated field in the waveguide. The waveguide slots of each waveguide slot pair may be generally crescent-shaped and spaced a distance of at least approximately one-fourth of the characteristic wavelength from each other. The waveguide slots may further be positioned for allowing the antenna to receive and/or radiate both left-hand and right-hand circularly polarized fields (LHCP and RHCP) and for providing control of the sense of a circularly polarized (CP) field radiated by the antenna by changing the direction of incidence of an electromagnetic source wave propagated in the waveguide.

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