Title :
Multiple beam system with circular arrays
Author :
Sudrez-Fajardo, C. ; Ferrando-Batallur, M. ; Valero, A. ; Rodrigo, V.
Abstract :
The switched beam antenna, a smart antenna technology, consists of an array of antennas, a beamforming network and a switching matrix. It may be used to generate n beams to improve the carrier to interference ratio (CIR) and the reuse of frequency in cellular systems, increasing system capacity. This paper describes simplified hardware and software techniques to improve antenna parameters such as: SLL, crossover, and beam orthogonality, by means of a pair of Butler matrices.
Keywords :
adaptive antenna arrays; antenna radiation patterns; array signal processing; cellular radio; matrix algebra; multibeam antennas; Butler matrices; CIR; SLL; beam orthogonality; beamforming network; carrier to interference ratio; cellular systems; circular arrays; crossover; frequency reuse; multiple beam system; smart antenna; switched beam antenna; switching matrix; system capacity; Antenna arrays; Antenna radiation patterns; Butler matrix; Couplers; Directional antennas; Frequency; Interference; Phase shifters; Phased arrays; Polynomials;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2005 IEEE
Print_ISBN :
0-7803-8883-6
DOI :
10.1109/APS.2005.1552732
