Communications: radio wave antennas – Antennas – Slot type
Patent
1988-06-09
1990-09-18
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Slot type
343771, H01Q 1300
Patent
active
049581651
ABSTRACT:
An element which acts as an antenna and circular-polarizer for the domestic reception of DBS signals has a front plate of aluminum alloy, with two slots and of differing length and orthogonally crossing at their midpoints. The width and length of slots and are chosen in order to provide equal power flow through the slots and adequate bandwidth appropriate to the format of the DBS frequency band.
Behind the plate the element has a rectangular housing to form a cavity containing a suspended strip line with a support whose free end is located below the point of crossing the two slots, and which extends outwardly therefrom in a straight line bisecting the angle formed by adjacent arms of the slots and being in a plane parallel to the plate.
REFERENCES:
patent: 4131894 (1978-12-01), Schiavone
patent: 4242685 (1980-12-01), Sanford
patent: 4443802 (1984-04-01), Mayes
patent: 4614947 (1986-09-01), Rammos
patent: 4626865 (1986-12-01), Rammos
Axford Walter J.
Chana Satwinder S.
Thorm EMI plc
Wimer Michael C.
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