Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-09-19
1979-01-02
Lieberman, Eli
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
324 95, 343703, C01R 2908
Patent
active
041329929
ABSTRACT:
The circuit includes a receiving circularly polarized crossed slot waveguide antenna having a longitudinal axis and spaced crossed slots disposed on a selected side of said axis spaced therefrom; and a broadband matched magic "TEE" hybrid having an output difference port, an output sum port, a first input port coupled to the receiving antenna to receive therefrom left-hand circularly polarized waves and a second input port coupled to the receiving antenna to receive therefrom right-hand circularly polarized waves. A microwave meter is coupled to the difference port to detect the value of the difference (.DELTA.) of the waves coupled to the first and second input ports and another microwave meter coupled to the sum port to detect the value of the sum (.SIGMA.) of the waves coupled to the first and second input ports to enable solving the equation R = 20 log .SIGMA./.DELTA. to obtain the value R of the radiation axial ratio.
REFERENCES:
patent: 2982960 (1961-05-01), Shanks
patent: 3890571 (1975-06-01), Beyer
Hill Alfred C.
International Telephone and Telegraph Corporation
Lieberman Eli
O'Halloran John T.
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