In order to meet the rapid development of satellite communication in millimeter-wave,a novel Q band transmission amplicated circuit for space application is presented in this paper.Firstly,the scheme diagram of Q band transmission amplicated circuit is given.The local oscillator-doubler chain and radio frequency-signal amplification circuits have been totally integrated in a single multi-chip module.Then,some measures have been taken to improve the broadband characteristics of designed transmitter.The impedance matching network has been simulated and a new kind of waveguide-coaxial-microstrip probe is optimized to increase its operating bandwidth and decrease the insertion loss with the open stubs.the gain flatness in a wide bandwidth has significantly improved.Lastly,the method to avoid cavity resonance?interference is also introduced.the anti-interference ability of designed circuit is improved by optimizing its DC power supply.This designed Q band transmission amplicated circuit is fabricated and tested.A agreement results have been achieved.It has broad application in the future.
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