A Filtering Impedance Transformer With Complex Load Based on Coupling Matrix
Jingsong Wu, Yuetian Wang, Shanshan Xue, Chang Xu, Xiaolong Wang, Geyu Lu · 2024
A filtering impedance transformer (FIT) consisting of two split ring resonators (SRRs) is proposed in this letter. The impedance normalization is redefined by changing the complex load of the FIT to the real load, which can obtain new transfer and reflection functions. The circuit dimensions of the proposed FIT are determined by the simplified coupling matrix. Measurement results show that the proposed FIT achieves good impedance matching over 7.27% of the fractional bandwidth (FBW) and the return loss (RL) better than 12.5 dB. Measurement results coincide with simulation results, which can verify the design theory.