A compact (0.16 g 0.08 g ) and wide stopband lowpass filter design using open complementary split ring resonator (OCSRR) and defected ground structure (DGS) is presented in this paper. Low pass filter is constructed using two cascaded stages of OCSRR. Since the rejection bandwidth of the OCSRR is narrow, tapered dumbbell shaped DGS section is placed under the OCSRR to enhance the bandwidth. The cutoff frequency (f c ) of the proposed lowpass filter is 1.09 GHz. The rejection bandwidth of the filter covers the entire ultra wideband spectrum. Hence the spurious passband suppression is achieved up to 10 f c . The designed filter has been fabricated and validated by experimental results.
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Karthikeyan et al. (2015) studied this question.