Title :
A balanced adaptive beamforming system for broadband wireless communications
Author :
Seong-Sik Jeon ; Yuanxun Wang ; Itoh, T.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
A broadband analog beamformer is realized in the form of balanced variable attenuators using PIN diodes. The phase deviation due to change in junction capacitance of a PIN diode with respect to applied voltage is improved by using a balanced architecture in the design of the variable attenuator. Measurement shows flat phase transition and linear attenuation over the frequency range from 2.5 GHz to 3.0 GHz, which can provide giga bit data throughput for QPSK modulated signal.
Keywords :
array signal processing; attenuators; p-i-n diodes; quadrature phase shift keying; radio equipment; 2.5 to 3.0 GHz; PIN diode; QPSK modulation; analog beamformer; balanced adaptive beamforming system; balanced variable attenuator; broadband wireless communication; Adaptive systems; Array signal processing; Attenuation measurement; Attenuators; Capacitance; Chirp modulation; Frequency measurement; Phase measurement; Throughput; Voltage;
Conference_Titel :
Microwave Symposium Digest, 2002 IEEE MTT-S International
Print_ISBN :
0-7803-7239-5
DOI :
10.1109/MWSYM.2002.1011921
