Abstract
In this letter, we numerically and experimentally investigate the stop-band performance of coplanar waveguide (CPW) band-stop filter (BSF) that consists of circular complementary split ring resonators (CCSRR) [16]. The measured center frequency (fr) of the BSF is 11.56 GHz with high rejection rate, and the 3-dB BW varies by the number of cascading unit the CCSRR cells are loaded with. It has been observed that a single CSRR in the ground plane provides a very high Q factor and also gives a low stop-band BW with low insertion loss. BSFs with unit CCSRR for designs are designed and calculated. A good agreement between simulated and calculated results is achieved [17]. In addition, the CSRR in CPW configuration can be easily integrated into microwave circuit due to purely planar technology, which is favorable to MMIC designs.
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