Communications: radio wave antennas – Antennas – Slot type
Patent
1997-07-31
2000-02-22
Le, Hoanganh
Communications: radio wave antennas
Antennas
Slot type
343770, H01Q 1310
Patent
active
060285621
ABSTRACT:
A waveguide-implemented antenna comprising a planar array of waveguide slot radiators for communicating electromagnetic signals exhibiting simultaneous dual polarization states. The antenna can consist of parallel waveguides of rectangular or ridged cross section. The broadwalls of each parallel waveguide contain a linear array of input slots for receiving (transmitting) electromagnetic signals having a first polarization state from (to) the parallel waveguide and for transmitting (receiving) those signals into (from) an array of cavity sections. The cavity sections comprise a short section of uniform waveguide with a length of much less than a wavelength in the propagation direction. The cavity sections feed to output slots which are rotated relative to the input slots; such that the output slots exhibit a second polarization state, which they radiate (receive) to (from) free space. By interlacing parallel waveguides with alternating +45 degree and -45 degree rotations of the output slots, two independent antennas are formed exhibiting simultaneous dual polarizations.
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Guler Michael G.
Montgomery James P.
EMS Technologies Inc.
Le Hoang-anh
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