Design of High Performance LPF with Excellent Return Loss Using Stepped Impedance and Radial Resonators
In this paper, the author proposed a novel microstrip LowPass Filter (LPF) using stepped impedance, radial and open stub resonators. The insertion loss of the proposed filter is less than 0.4dB in frequency range from DC up to 1.65GHz. The transition band is from 1.796 up to 2.060GHz with -3 and -40dB attenuation points, respectively. LC equivalent circuit of the proposed main resonator is calculated precisely. The stopband bandwidth with a suppression factor of 25dB is from 2.023 up to 15.14GHz is reached; hence, a wide stopband with high suppression is accomplished.