Design of UWB notch filter using CRLH metamaterials

In this paper, we propose a stop-band notch filter, which rejects the narrow frequency band of the Wi-MAX 802.16d (3.4 GHz to 3.6 GHz) and keeps the remaining UWB spectrum (3.1-3.4 and 3.6-3.9 GHz) unchanged. The proposed filter has been realized using the metamaterial technology based on the CRLH metamaterial structures. The selected center operating frequency is 3.5 GHz, which is the mid-band frequency for the Wi-MAX. The obtained results have shown that the 3-dB notch bandwidth is about 200 MHz frequency band which extends from 3.4 to 3.6 GHz. The filter has been designed, simulated, optimized and fabricated using conventional MICs technologies. The simulation and the measurement results have been compared. The insertion loss shows -29 dB at the frequency of interest. The comparison reveals good agreement between the simulated and the measured results.