An Improved Equivalent Circuit Model for CSRR-Based Bandpass Filter Design With Even and Odd Modes

作者：Liu Ji Chyun^*; Lin Hsieh Chih; Zeng Bing Hao; Yeh Kuan Dih; Chang Dau Chyrh

来源：IEEE Microwave and Wireless Components Letters, 2010, 20(4): 193-195.

DOI：10.1109/LMWC.2010.2042548

• Bandpass filter (BPF)
• complementary split-ring resonator (CSSR)
• even and odd modes

We present a new equivalent circuit model that incorporates the resonances and transmission zeros in terms of even and odd modes for CSRR-based bandpass filter (BPF) design. The circuit model and three resonance characteristics are consistent with the geometry of the CSRR-based BPF. The variations of distance ratio, related gap and loop number are investigated. The good performance of lower insertion loss (0.87 dB), deeper and symmetric transmission zero level (-53.20 dB), wider bandwidth (fractional BW 89.4%) and wider stopband (extended to 2.9 below -28.5 dB rejection level) at the central frequency f(0) = 1.88 GHz are achieved by this methodology.

• 出版日期2010-4