| Satellite communication has become an essential part of wireless communications with the continuous advancement of science and technology.It has a wide range of applications in various fields such as the military and civilian sectors with its advanced technical means.Moreover,satellite communication has been developing towards highfrequency broadband in recent years.The RF transceiver front-end,as one of the components of a satellite communication system,plays a vital role in satellite communication.Therefore,developing a Ka-band broadband low-spurious engineering test prototype for satellite communication has high engineering application value for the research on key technologies of Ka-band satellite transceiver module.This thesis introduces a detailed design scheme and process of the Ka-band satellite transceiver front-end.The electrical modulation filter is used to realize the radio frequency segmental filtering scheme,so as to achieve a high stray suppression.In addition,the reference circuit of the phase-locked loop is designed,so that the transceiver front end can better meet the phase noise requirements as a "Satellite communication OnThe-Move" equipment.The test prototype that is finally developed realizes the full band coverage of Ka-band satellite communication,with the uplink frequency of 27.5-31 GHz and the downlink frequency of 17.7-21.2 GHz,achieving the goals of broadband,lowspurious,high phase noise and miniaturization.It can achieve a maximum output power of over 4 W for the Ka transmission channel,a spurious suppression of better than 55 d Bc,a transmission gain of greater than 50 d B,and a third-order intermodulation index of better than-24 d Bc.The receiving channel has a gain of greater than 60 d B and a noise figure of less than 2.7 d B.At the same time,by using digital compensation technology,the gain flatness within the bandwidth of both transmission and reception signals is less than 3 d B,and the gain fluctuation over full temperature range is less than 2 dB. |
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