Design and Implementation of Broadband Satellite IF Transceiver

This paper proposes a broadband IF subsystem used in Ku-band satellite transceiver, and performs I/Q amplitude and phase imbalance calibration. This paper also designs a 16-channel microstrip Wilkinson power divider with a working frequency of 950-2150MHz. For the proposed transceiver, broadband image rejection tests are performed after I/Q imbalance calibration. The innovation of this paper is to use the adjustable gain module of amplification-attenuation-amplification to increase the dynamic range of the transceiver and avoid self-excitation caused by direct cascading of amplifiers. In addition, a high and low local oscillator switching filter is designed to filter out the second and above high-order harmonics to ensure the orthogonality of modulation and demodulation. The test results show that the proposed transceiver has good IRR and EVM performance, applicable for broadband satellite communication.