High Q Dual Band Super High Frequency Notch Filter Based on Complementary Metamaterial

High Q dual band notch filters are vital constituent of modern microwave, mobile and satellite communication systems to enhance multiband operations. In this paper, resonant type metamaterial concept is used to design a high Q dual band super high frequency (SHF) notch filter. For this purpose, a multi-mode complementary metamaterial structure named complementary symmetric split ring resonator (CSSRR) is proposed. By simulation, fabrication and experiment, the resonance frequency of first notch is 5.35 GHz with attenuation level 62.08 dB, fractional bandwidth 36.07% and Q factor 267.5. While resonance frequency of second notch is 8.06 GHz with attenuation level 19.46 dB, fractional bandwidth 15.63% and Q factor 53.7. Proposed SHF notch filter has some unique features like small size, large stopband attenuation, wider bandwidth, and high Q factor.