Abstract
Tunable narrowband impedance matching networks (MNs) can be used to optimize output power in real time, maximizing radar range after operating-frequency changes in spectrum sharing radar transmitters have been accomplished. This paper compares the performance of two similar power-amplifier (PA) designs: one with a fixed, broadband output MN and the other with a tunable, narrowband output MN. The 50 Ohm stable PAs were designed for optimal gain performance in the operating range of 3.1 GHz to 3.5 GHz, with the harmonics terminated to maximize gain. Simulation results show that the design with the tunable output MN can achieve greater than 2 dB increase in gain across the entire frequency range over a fixed broadband MN design. This allows a significant increase in output power and radar detection range, with reconfiguration time being the primary tradeoff incurred from using a reconfigurable matching circuit.
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