Null control of multiple beam antenna

Details Null control of multiple beam antenna Null control of multiple beam antenna

1980-07-14

1982-06-15

Lieberman, Eli

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

343100LE, H01Q 330

Patent

active

043353886

ABSTRACT:
This specification discloses a multibeam antenna which produces a null at one or more specified points with greater frequency band width for a given null depth. For example, a ring of beams about the null are set to have a phase difference between adjacent beams of 360.degree. divided by the number of beams in the ring. The amplitude of each of the beams is chosen so that each such ring set is self-nulled at the intended null and any common change in the side lobes of all beams of a ring set at the null due to frequency change is substantially equal. Thus, even with change in frequency, the null depth and position is substantially unchanged.

REFERENCES:
Dion; Optimization of a Communication Satellite Multiple-Beam Antenna, Lincoln Lab, MIT, Tech Note 1975-39, May 27, 1975, pp. 20-41.
Tomiyasu; Sequential Phasing in Multiple Beam Antenna for Interference Reduction; 1977 IEEE AP-S Symposium Digest, pp. 428-431.
Dion et al.; A Variable-Coverage Satellite Antenna System; Proc. IEEE, Feb. 1971, pp. 252-262.

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