Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1989-08-23
1992-06-16
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With polarization filter or converter
343786, 343787, 333 21A, 333 243, H01Q 1300, H01P 117
Patent
active
051228106
ABSTRACT:
An antenna arrangement for receiving television signals from a satellite comprises a parabolic dish which collects the signals and feeds them through a feedhorn, then through a polarization switch and to a low noise block to the receiver. The polarization switch comprises a ferrite rod supported in a dielectric holder within a circular waveguide. The ferrite rod is surrounded by a solenoid coil which is energizable to rotate the plane of polarization of the signals passed along the waveguide, so as to enable the switch to select either horizontally or vertically polarized signals. The current in the coil is switchable between two values, one having a predetermined magnitude in one direction through the coil and the other having the same predetermined magnitude but in the opposite direction through the coil. The current levels are seleced such that the corresponding angular positions for the plane of polarization are +45.degree. relative to the datum position for the polarization plane and -45.degree. with reference to this datum position. The dielectric holder has a stepped configuration so as to match the loaded waveguide to the empty waveguide.
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Zinburg, "Circular Polarization System for Suppression of Rain Echoes", Luftfahrttechnik, Raumfahrttechnik 9 (1963) No. 2., Feb.
Baird Andrew P.
Ferguson Robert M.
Nisbet William T.
Racal-Mesl Limited
Wimer Michael C.
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