Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1980-11-24
1982-10-05
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural separate diverse type
343778, 343786, H01Q 1302
Patent
active
043530729
ABSTRACT:
A radio frequency antenna including an antenna element having an open-ended waveguide section coupled to a first feed means for establishing radio frequency energy having linear polarization, the electric field vector of such energy being disposed normal to a pair of opposing wall portions of the waveguide. The antenna element includes a microwave circuit means for establishing radio frequency energy having a linear polarization orthogonal to the polarization of the first mentioned radio frequency energy. The microwave circuit includes a dielectric and a conductive sheet disposed over the dielectric; such sheet providing one of the wall portions of the waveguide section. The conductive sheet has an array of notches formed therein, such notches being disposed adjacent the open end of the waveguide section. A second feed means is coupled to the array of notches for establishing radio frequency energy having a linear polarization, the electric field thereof being in the plane of the dielectric and hence normal to the polarization established by the first feed means. With such arrangement, the first and second feed means are fed in quadrature and the phase centers of the orthogonally disposed polarized radio frequency energy at the open end of the waveguide are substantially coincident to thereby enable the antenna to establish circularly polarized radio frequency energy in free space. Further, the radio frequency energy fed to the second feed means is distributed to an array of notch shaped elements thereby increasing the power handling capability of the antenna element. Still further, the antenna element is relatively compact and suitable to be arranged in relatively wide scan angle coverage.
REFERENCES:
patent: 4141012 (1979-02-01), Hockham et al.
Lieberman Eli
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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