Improved Coupling Based Wide Pass-Band Filter with Double Square Complementary Split Ring Resonator

Frequency selection in objective domain plays a vital role in Band-pass filtering. Certain signals are only allowed in the ambit of Band-pass filter and attenuating frequencies outside the range. Complications arise while providing a wider pass-band spread in the domain. This paper proposes a coupling based approach for obtaining a broad spectrum. The methodology involves use of dual parallel coupled micro-strip lines along with double square complementary split ring resonator. The proposed coupling method is found to produce better results in terms of frequency selectivity, rejection rates, fraction band-width, Q-factor along with low average insertion losses in comparison to other filtering techniques.