Effective Bandwidth Improvement Technique Based On Mismatch Analysis
暂无分享,去创建一个
The mismatch in cascaded two ports is a common cause of ripple increase and bandwidth reduction in broadband systems. A new mismatch factor, D, is defined to deal with the individual S21 and global S21 parameters in a cascaded network. The relationship between this D factor and the effective bandwidth is presented. This bandwidth can be improved inserting a matched attenuator. The method has been applied to a Q band broadband amplifier, based on two cascaded multistage MMIC amplifiers, used in a radiometer for a space application. Effective bandwidth has been improved inserting a series thin film resistor attenuator. The design expressions and criteria of such microstrip attenuators are described
[1] M. E. Tiuri,et al. Radio Astronomy Receivers , 1964, IEEE Transactions on Military Electronics.
[2] Beatriz Aja,et al. Q-Band Monolithic GaAs PHEMT Low Noise Amplifiers: Comparative Study of Depletion and Enhancement Mode Transistors , 2002 .
[3] Pekka Kangaslahti,et al. Technology for Millimetre Wave Radiometers , 2003, 2003 33rd European Microwave Conference, 2003.