Polarization agile planar array

Details Polarization agile planar array Polarization agile planar array

1977-12-19

1980-04-08

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343771, H04B 700

Patent

active

041975413

ABSTRACT:
A planar array and associated apparatus providing polarization agility in radar systems. The array is composed of first and second pluralities of generally parallel, slot-radiator, linear arrays. The first group of linear arrays has radiator slots oriented at 45.degree. with respect to the axial (lengthwise) dimension of the linear arrays. The second group also has 45.degree. slots, but they are rotated 90.degree. with respect to the slots of the first group. First and second groups are interleaved, each group being excited in parallel, the first group directly from a transmit/receive port and the second from the same port but through a controllable phase shifter. The setting of the phase shifters of the array comprising the first and second groups of interleaved linear arrays produces a corresponding operating polarization. Each linear array is a length of coaxial transmission line with rectangular or square outer conductor, the slots being cut into the walls thereof. An alternative instrumentation includes an attenuator for charging the relative excitation amplitude between first and second linear array groups and provides elliptical polarization.

REFERENCES:
patent: 3135959 (1964-06-01), Moran
patent: 3286260 (1966-11-01), Howard
patent: 3526898 (1970-09-01), Plunk et al.
patent: 3560975 (1971-02-01), Manuali
patent: 3701162 (1972-10-01), Seaton
patent: 3716856 (1973-02-01), Beguin
patent: 3810186 (1974-05-01), Nakahara et al.
Ferris, Joseph E. Study of Polarization Modulation Techniques, p. 76, Melpar Inc.

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