Compact, deep, and wide rejection bandwidth low‐pass filter using open complementary split ring resonator

A deep and wide rejection bandwidth, sharp cutoff and compact low-pass filter design using open complementary split ring resonator (OCSRR), and open stub is presented in this article.OCSRR is counterpart of the open split ring resonator. The proposed low-pass filter consist of two OCSRR connected in series. The open stubs are attached on both sides of the OCSRR. At the 3 dB cutoff frequency of 1.08 GHz, the proposed filter offers a sharp rejection and wide rejection bandwidth of more than 20 dB up to six times the cutoff frequency. The filter size is very small as 0.22 λg × 0.18 λg, where λg is the guided wavelength at the cutoff frequency. The proposed filter is fabricated and tested; the experimental results are found to be in good agreement with the simulation results. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:845–848, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25874