Multimode array antenna

Details Multimode array antenna Multimode array antenna

1980-12-23

1983-03-08

Lieberman, Eli

Communications: radio wave antennas

Antennas

Slot type

H01Q 1310

Patent

active

043762816

ABSTRACT:
An array antenna having a plurality of radiating elements positioned in a planar configuration is divided into four separate quadrants. The array antenna is capable of being switched between two modes, a narrow pencil beam mode and a cosec.sup.2 .theta.cos.theta. mode, through the use of a single switch and a pair of phase shifters. In the pencil beam mode, the transmitted energy is symmetrically divided between the four quadrants of the antenna. By changing the switch to its second position the power is diverted to only the upper half of the antenna and a pair of phase shifters introduces a phase shift to the radiating elements along the lower half of the upper portion of the antenna. This causes an asymmetric radiation pattern from the antenna creating the cosec.sup.2 .theta.cos.theta. beam which is well suited for ground mapping.

REFERENCES:
patent: 3247512 (1966-04-01), Diamond
patent: 3286260 (1966-10-01), La Var Howard
patent: 3305867 (1967-02-01), Miccioli et al.
patent: 3604012 (1971-09-01), Lindley
patent: 3893124 (1975-07-01), Barker
patent: 3969729 (1976-07-01), Nemit
patent: 3971022 (1976-07-01), Lenz
patent: 4057803 (1977-11-01), Coleman
patent: 4121220 (1978-10-01), Scillieri et al.

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