New Design Approach to Multiple-Beam Forming Network for Beam-Steerable Phased Array Antennas

Fumio KIRA
Kenji UENO
Takashi OHIRA
Hiroyo OGAWA

IEICE TRANSACTIONS on Electronics   Vol.E82-C    No.7    pp.1195-1201
Publication Date: 1999/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: Phased Arrays and Antennas
multi-beam matrix,  beam steering,  BFN,  phased array antenna,  satellite communication onboard systems,  

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The onboard antenna beam forming network (BFN) of the next-generation communication satellites must offer multiple beam forming and beam steering. The conventional BFN, which directly controls the array elements, is not suitable for a large-scale array antenna because of the difficulty of BFN control. This paper proposes a new BFN configuration that consists of three/four-way variable power dividers and a Butler matrix (FFT circuit). This BFN can offer continuous beam steering with fewer variable components. By introducing new techniques based upon excluding FFT periods and power evaluations by definite integration, the deviation in beamwidth is reduced by 75% or more and the maximum sidelobe level is improved by 10 dB or more.