Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1991-02-25
1993-02-02
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
H01Q 322, H01Q 324, H01Q 326
Patent
active
051841401
ABSTRACT:
Disclosed herein is an antenna system comprising a plurality of element antennas, a plurality of variable phase shifters and a plurality of variable amplitude type devices connected to the plurality of element antennas respectively, and an arithmetic unit used to perform the arithmetical operation of the excitation amplitude and phase for exciting each of the plurality of element antennas. The arithmetic unit includes the four means and performs the arithmetical operation of the excitation amplitude and phase used to define a desired radiation pattern composed by each of the element antennas with respect to a preset allowable variation width D of the excitation amplitude. Since the arithmetic unit serves to fix the excitation amplitude and perform the arithmetical operation of the excitation phase separately, the antenna system capable of performing the arithmetical operation of the excitation amplitude and phase for obtaining a desired radiation pattern with respect to the preset allowable variation width D of the excitation amplitude, and obtaining a desired radiation pattern even when the allowable variation width D of the excitation amplitude is given, can be realized.
REFERENCES:
patent: 4217586 (1980-08-01), McGuffin
patent: 4313116 (1982-01-01), Powell et al.
patent: 4338605 (1982-07-01), Mims
patent: 4752969 (1988-06-01), Rilling
patent: 4983981 (1991-01-01), Feldman
Klein, C. A., "Design of Shaped-Beam Antennas Through Minimax Gain Optimization", IEEE Transactions on Antennas and Propagation, vol. AP-32, No. 9, Sep. 1984, pp. 963--968.
Chiba Isamu
Hariu Kenichi
Mano Seiji
Blum Theodore M.
Mitsubishi Denki & Kabushiki Kaisha
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