An Adaptive Array Antenna Steered by IF Local Signal Phase Shifters for K-Band Broadband Fixed Wireless Access Base Station

Shuichi OBAYASHI  Osamu SHIBATA  Hideo KASAMI  Hiroki SHOKI  Yasuo SUZUKI  

IEICE TRANSACTIONS on Communications   Vol.E84-B   No.9   pp.2523-2529
Publication Date: 2001/09/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems)
Category: Adaptive Antennas
adaptive array antenna,  fixed wireless access,  base station,  local signal phase shifter,  K-band,  

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Broadband fixed wireless access (FWA) systems offer significantly higher bit rates than current cellular systems to which adaptive arrays are partly applied. Digital beam forming is being eagerly explored on account of its flexibility, but it will be difficult to apply to the high-speed systems, because its digital signal processing requires huge resources and power consumption. Conventional phased arrays, on the other hand, utilize phase shifters through RF or IF signal lines, but the phase shifters are usually both bulky and expensive. The authors propose an adaptive array steered by IF local signal phase shifters in this paper. The phase shift and the frequency shift of the signal from each antenna element can be simultaneously accomplished at the down conversion stage by the phase-controlled local signal. A prototype receiver operated in the K-band with the proposed configuration and its beam pattern measurement results are also described.