Novel Dual-Band Impedance Matching Circuits Implemented by Complementary Compact Microstrip Resonant Cells (CCMRCs)

This paper presents a novel dual-band impedance matching circuit (IMC) based on the quarter-wave-like transformer (QWLT), which can be effectively implemented by complementary compact microstrip resonant cells (CCMRCs). In this study, the dual-band IMC is designed at 3.3 GHz and 4.4 GHz for 5G technology applications in Thailand. In this study, a QWLT implemented by an asymmetric CCMRC can be systematically designed using the ABCD parameters of the CCMRC by solving associated equations of impedance matching simultaneously at both frequencies of interest. It is found that the asymmetric CCMRC can provide the length reduction of 14.8 % with excellent impedance matching at both frequencies of interest, compared to that of the symmetric case.