Communications: radio wave antennas – Antennas – Slot type
Patent
1999-03-01
2000-10-03
Le, Hoanganh
Communications: radio wave antennas
Antennas
Slot type
343770, H01Q 1310
Patent
active
061279854
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 ridged waveguides having rectangular or "T"-shaped ridged cross sections. The ridged walls of each parallel ridged waveguide contain a linear array of input slots for receiving (transmitting) electromagnetic signals having a first polarization state from (to) the parallel ridged waveguides and for transmitting (receiving) those signals into (from) a corresponding array of cavity sections. The cavity sections comprise a short section of uniform waveguide with a thickness 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 ridged waveguides with alternating +45 degree and -45 degree rotations of the output slots, two independent antennas are formed exhibiting simultaneous dual polarizations. Because the input slots are located in the ridge wall of the parallel ridged waveguides, the parallel ridged waveguides can be fed from their broad wall side. Feeding the parallel ridged waveguides from their broad wall side eliminates a need for a complex feed network.
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A two-beam slotted leaky waveguide array for mobile reception of dual polarization DBS; Department of Electric and Electronic Eng. Tokyo Institute of Technology.
EMS Technologies Inc.
Le Hoang-anh
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