Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1995-08-02
1997-01-07
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342157, H01Q 322, H01Q 324, H01Q 326
Patent
active
055921795
ABSTRACT:
A phased-array antenna (18) for use with a frequency-hopping transmitter (16) includes a plurality of elemental antennas (210), each associated with a phase-shifter (212) which is controlled (20) to form a beam (216) in the desired direction at a base frequency. The antenna elements (210, 212) are formed into subarrays (408t, 408b) each of which is fed from a common port (310). A further phase-shifter (312) is associated with each subarray, for imposing a phase shift on a group of elements of the overall array. The further phase-shifters are controlled when the frequency of the transmitter is away from the base frequency, to cause a stepwise-continuous correction phase across the array, which maintains the desired beam direction.
REFERENCES:
patent: 4045800 (1977-08-01), Tang et al.
patent: 4894660 (1990-01-01), Thomson et al.
patent: 5206655 (1993-04-01), Caille et al.
patent: 5281974 (1994-01-01), Kuramoto et al.
patent: 5414433 (1995-05-01), Chang
Blum Theodore M.
Gomes D. W.
Martin Marietta Corp.
Meise W. H.
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