CAD AND EXPERIMENTAL RESEARCH OF THE MICROSTRIP EQUALIZER FOR TWT AMPLIFIER

Theoretical and experimental research have been done for external TWT equalizer by using microstrip circuit. In order to further improve the performance of TWT, a CAD method is employed to optimize the circuit parameters, and then the gain variation can be reduced from 11.2 dB to 2.74 dB at a bandwidth of 2.8-7.0 GHz. A two-stage equalizer has been also tested. After adjusting six parameters in the microstrip circuit by the use of computer, the gain variation could be reduced from 13.6 dB to 2.73 dB at a bandwith of 2.5--7.5 GHz. But the experimental results is about 5 dB. The deviation between them is analyzed qualitatively.