microstrip low pass filter with wide stopband using T-shaped resonators

In this letter, a microstrip low pass filter with wide stopband using T-shaped resonators is designed. The proposed low pass filter using ADS software is simulated. The filter consists of 5 pairs of symmetrical T-shaped resonators. The 3-dB cutoff frequency is 1.7 GHz, applicable for L-band spectrum. The transition-band is sharp (21 dB/GHz).The stopband bandwidth with 21dB suppression level is extended from 1.97 GHz To 30 GHz (8 unwanted harmonics are rejected). The physicals size of the designed LPF is 815.1 mm2.

Keywords:

low pass filter , microstrip , T-shaped resonator.