Communications: radio wave antennas – Antennas – Antenna components
Patent
1984-12-10
1987-01-20
Lieberman, Eli
Communications: radio wave antennas
Antennas
Antenna components
H01Q 1502
Patent
active
046383247
ABSTRACT:
An angular filter for electromagnetic radiation is formed of a set of elements supported on a dielectric substrate. The elements are electrically conducting and include resistance for dissipating energy of the radiation. Each element is formed as a closed loop in a plane normal to an axis of propagation of the radiation so as to minimize interaction with a transverse magnetic field of the radiation at zero angle of incidence to the filter, the interaction and consequent attenuation increasing with increasing angle of incidence. Thereby, spurious sidelobes of a radiation pattern associated with a radar or other antenna can be reduced by the filter in favor of the main lobe along the antenna axis. The elements may be formed by a set of members spaced apart to introduce capacitance for resonating with inherent inductance of the members, thereby to enhance the filter attenuation.
REFERENCES:
patent: 3148370 (1964-09-01), Bowman
patent: 3633206 (1972-01-01), McMillan
patent: 4169268 (1979-09-01), Schell et al.
patent: 4343002 (1982-08-01), Luh
patent: 4344077 (1982-08-01), Chekroun et al.
patent: 4467330 (1984-08-01), Vidal et al.
patent: 4495506 (1985-01-01), Sasser et al.
patent: 4518966 (1985-05-01), Sadones
Franchi and Mailloux, Theoretical and Experimental Study of Metal Grid Angular Filters for Sidelobe Suppression, 1983 IEEE, pp. 445-450, vol. AP-31, May, No. 3.
Electronics Letters, 4/1/82, vol. 18, No. 7, pp. 294-296--Equivalent Circuit Model for Arrays of Square Loops.
Agovino F. R.
Hazeltine Corporation
Lieberman Eli
Onders E. A.
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