Polarization agility in an RF radiator module for use in a phase

Details Polarization agility in an RF radiator module for use in a phase Polarization agility in an RF radiator module for use in a phase

1991-11-20

1994-04-19

Lee, Benny T.

Communications: radio wave antennas

Antennas

Wave guide type

343756, 333117, 333 21A, 333 241, 333158, H01Q 336, H01P 1161, H01P 516, H01P 118

Patent

active

053049993

ABSTRACT:
A 90.degree. coupling circuit cascaded with a pair of hybrid mode latchable phase shifters provides polarization agility for an RF radiator module of the type typically used in a phased array. For example, such radiator modules typically may utilize an active microwave integrated circuit (MIC), a monolithic microwave integrated circuit (MMIC) or a passive reciprocal hybrid mode element (RHYME) circuit. These circuits are arranged to provide duplex RF transmit/receive functions with controllable phase shifts at each radiator site in a phased array. By appropriately setting the two controllable phase shifters to different combinations of phase shifts (e.g., 0.degree. and/or 90.degree.) to a dual orthogonal mode radiator, different spatial polarizations for RF radiator transmit/receive functions can be defined. The radiator itself may include a square or circular waveguide including, in some cases, a reciprocal dielectric quarter-wave plate and a non-reciprocal ferrite quarter-wave plate. If a square waveguide is utilized, then 0.degree., 90.degree. hybrid mode latchable phase shifters may be arranged on either side of a common ground plane with direct waveguide coupling into a septum polarizer waveguide section of the radiator element. A 90.degree. Lange hybrid coupler also may be used by itself in conjunction with an electrically rotatable ferrite quarter-wave plate radiating element to achieve a certain degree of polarization agility.

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"A Collection of Writings Pertaining to Fast Switching, Ferrite Phase Shifters," Mar. 20, 1991, by Electromagnetic Sciences, Inc., Norcross, Ga.

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