Design of Bandpass Filter Based on Asymmetrical T-shaped Resonators

Two different T-shared resonators are used for the proposed bandpass filter with wide rejection band. Each resonator is considered with dissimilar impedance and electrical length because of the harmonics resonant response generating with difference positions. All theoretical and experimental results are verifying this concept at the fundamental frequency 2.45 GHz. The insertion loss is 2.74 dB and the return loss is 21.95 dB respectively. The levels of stopband are lower than 25 dB up to 20 GHz.