Improved Stopband of the Dual-Mode Ring Bandpass Filter Using Periodic Complementary Spilt-Ring Resonators

Hung-Wei WU  Min-Hang WENG  Yan-Kuin SU  Cheng-Yuan HUNG  Ru-Yuan YANG  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.8   pp.1255-1258
Publication Date: 2006/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.8.1255
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
dual-mode,  bandpass filter,  complementary split-ring resonators (CSRRs),  spurious suppression,  

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This investigation proposes a modified equivalent circuit of single complementary split-ring resonator (CSRR) in planar transmission media and a dual-mode ring bandpass filter (BPF) that uses periodic CSRRs to suppress the spurious response. The proposed modified equivalent circuit consists of lumped elements that can be easily extracted from the measured S parameters. The proposed dual-mode ring BPF has exhibits a wide stopband characteristic owing to the bandgap resonant characteristic of CSRRs in the harmonic frequency of the dual-mode ring BPF. Good agreement with EM simulation and measurement is demonstrated.