Design of Concurrent Multiband Matching Networks for Low Noise Amplifiers in Multiband Radios

This paper presents the design and implementation of concurrent multiband impedance matching networks (MBIMNs) for low noise amplifiers (LNAs). The designed MBIMNs were implemented using microstrip lines on FR-4 and Roger’s 5880 substrates. The designed dual band IMN (DBIMN) operates at 900 MHz and 2.0 GHz. The |S11| for DBIMN circuit are -20dB and-23dB at 900 MHz and 2.0 GHz, respectively. For the designed triband IMN (TBIMN), the three bands are centered at 900 MHz, 2.4 GHz and 3.2 GHz and the measured |S11| are -44.6dB, -14.7dB and -33.9 dB, respectively. The proposed technique can be implemented to design MBIMNs at other frequencies.