Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1986-12-29
1989-11-21
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342375, 455277, H01Q 302
Patent
active
048825891
ABSTRACT:
A coherent multiple beam antenna switching system is disclosed. The invention is adapted for use with an antenna having a switch for directing a signal through a first feed via a first channel into a output port and for directing a signal received by a second feed into said first channel at a time T. The invention includes a power detection circuit for measuring the power in the signal in the first channel via the first feed and a controller responsive to the measured power for activating the switch prior to time T to direct the signal via the second feed and a second channel to the output port. The controller includes the capability of predicting the switching of feeds and switches in the second channel in anticipation thereof. Phase detection and correction circuits are provided for aligning the signal in the second channel with the signal in the first channel. When the signals are aligned, the channels are switched at baseband to provide for coherent switching with minimal switching transients.
REFERENCES:
patent: 2494309 (1950-01-01), Peterson
patent: 3922685 (1975-11-01), Opas
patent: 4234956 (1980-11-01), Adderley et al.
patent: 4255816 (1981-03-01), Grunza et al.
patent: 4328587 (1982-05-01), Mizuno et al.
patent: 4499472 (1985-02-01), Willet
patent: 4626858 (1986-12-01), Copeland
patent: 4633519 (1986-12-01), Gotoh et al.
Denson-Low Wanda K.
Hughes Aircraft Company
Mitchell Steven M.
Swann Tod
Tarcza Thomas H.
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