Design of a sharp response microstrip lowpass filter using taper loaded and radial stub resonators

Sohrab MAJIDIFAR, Mohsen HAYATI
2017 Turkish Journal of Electrical Engineering and Computer Sciences  
This paper proposes a compact microstrip lowpass filter with a wide stopband and a very sharp roll-off. This structure consists of two dual taper-loaded resonators that are connected to the radial stubs. The resonators are described using an LC model, and its Z-and S-parameters are extracted as a function of the LC component. In the proposed filter, cut-off frequency is placed at 1.76 GHz, roll-off rate is higher than 142 dB/GHz, insertion loss is less than 0.42 dB from DC to 1.5 GHz, and
more » ... 1.5 GHz, and rejection is greater than -24 dB from 1.88 to 15.2 GHz. The proposed filter is designed, fabricated, and measured, and the measured values are in good agreement with the EM-simulated results.
doi:10.3906/elk-1609-130 fatcat:vz64jbztvbctjja72okdymbst4