A Filtering Ultra-Low-Noise Amplifier Based on HISL Platform for <i>Ku</i> -Band Satellite Communication

This letter presents a filtering low-noise amplifier (LNA) based on novel hybrid integrated suspended line (HISL) platform for <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Ku</i>-band satellite communication (SATCOM). Based on the equivalent model established to characterize the optimal noise impedance of the used transistor, a bandpass filtering input matching network (IMN) is designed using the terminated coupled line structure (TCLS). Good noise matching of the entire passband is achieved due to the equivalent model-based design method. High out-of-band rejection is achieved due to multiple controllable transmission zeros (TZs) generated by TCLS, which greatly improves the flexibility and scalability of design. According to the measured results, the proposed LNA achieves a maximum gain of 25.3dB and an ultralow noise of 0.611.06dB from 9.2 to 13.1GHz. The rejection level is larger than 69 and 56dBc for the lower and higher bands, respectively.