Vol. 109

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2022-04-05

Poly-Resonator Lowpass Filter for 26th Order Harmonic Suppression

By Thevaruparambil Abdulnazer Nisamol, Parambil Abdulla, and Thulaseedharan Rekha
Progress In Electromagnetics Research M, Vol. 109, 179-189, 2022
doi:10.2528/PIERM22022502

Abstract

In this brief, an ultra-vast stopband lowpass filter with miniaturized circuit size for 26th harmonic suppression using poly-resonators and an inclined stepped-impedance transmission line (ISTL) is developed. The poly-resonators such as radial stub resonator and resonator modules constitute the significant part of the filter, and the discontinuity in the inclined angle of the ISTL is balanced by 75% chamfering. The coupling with ISTL has influence over the stopband behavior, and the equivalent circuit for the first transmission zero is analysed. The normalised circuit size is reduced to 16.6%, and additional frequency rejection is achieved using resonator modules RM1 and RM2. The relative stopband width of 185.4% is attained with a 3 dB cut-off frequency of 1.51 GHz. L band communication applications having circuit area limitations can make use of the Poly-resonator ISTL filter for achieving high-frequency noise rejection.

Citation


Thevaruparambil Abdulnazer Nisamol, Parambil Abdulla, and Thulaseedharan Rekha, "Poly-Resonator Lowpass Filter for 26th Order Harmonic Suppression," Progress In Electromagnetics Research M, Vol. 109, 179-189, 2022.
doi:10.2528/PIERM22022502
http://www.jpier.org/PIERM/pier.php?paper=22022502

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