Techniques for cophasing elements of a phased antenna array

Details Techniques for cophasing elements of a phased antenna array Techniques for cophasing elements of a phased antenna array

1978-06-02

1979-08-28

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343854, H01Q 326

Patent

active

041662741

ABSTRACT:
The present invention relates to a method of cophasing the feed elements of a transmitting or a receiving phased array antenna. To cophase a transmitting antenna, the method entails transmitting a lower sideband and an upper sideband signal from a first and a second one of the feed elements, respectively, while transmitting a carrier signal used to generate the sideband signals on all other feed elements of the array. At each receiver the reference phase angle between the received sideband signals is measured and stored. The above step is sequentially repeated for the first and a third, the first and a fourth, etc., one of the feed elements, and the phase angle measured, subtracted from the reference phase angle, and stored. With the above method, the phase angle between each feed element and the second one of the feed elements is determined and stored and subsequently transmitted back to the transmitter for use in transmitting signals to each receiver. To cophase a receiving antenna, a received signal is modulated at sequential pairs of the feed elements to produce the upper and lower side-band signals and enable the above cophasing sequence to be performed.

REFERENCES:
patent: 3140490 (1964-07-01), Sichak et al.
patent: 3271770 (1966-09-01), Lees
patent: 3378846 (1968-04-01), Lowenschuss
patent: 3453623 (1969-07-01), Blackband et al.
patent: 3646558 (1972-02-01), Campanella
patent: 3757336 (1973-09-01), Rosen
Markow, "Servo Phase Control Shapes Antenna Pattern", Electronics, Jan. 2, 1959, pp. 50-52.

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