Compact Bandpass Filter Based on Split Ring Resonators

The advances in communication technology stands for the need of compact size, easy to fabricate microwave devices. Herein, we propose a robust, tunable, band-pass filter, operating in the X-band (9.1 GHz). Metamaterial based on split-ring resonators (SRRs) is suggested to implement the proposed filter. The proposed design showed an improvement of 84% and 58% in the insertion loss (0.348 dB) and reflection loss (23.8 dB) respectively with respect to previous publications. In addition, the filter provided an acceptable sharpness to be utilized in radar applications. A tunability in the resonance frequency can be easily reached by changing the SRRs gap where a frequency range between 8.62 GHz and 9.46 GHz can be tuned. A fabricated filter is demonstrated where the mismatching between simulation and experimental results is justified.