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

Authors

SOHRAB MAJIDIFAR
MOHSEN HAYATI

DOI

10.3906/elk-1609-130

Abstract

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 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.

Keywords

Lowpass filter, circuit model, scaling, EM simulation

First Page

4013

Last Page

4022

Recommended Citation

MAJIDIFAR, SOHRAB and HAYATI, MOHSEN (2017) "Design of a sharp response microstrip lowpass filter using taper loaded and radial stub resonators," Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 25: No. 5, Article 42. https://doi.org/10.3906/elk-1609-130
Available at: https://journals.tubitak.gov.tr/elektrik/vol25/iss5/42