Vol. 112

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2021-04-19

An Analysis of High Selectivity and Harmonic Suppression Based on Stepped-Impedance Resonator Structure for Dual-Mode Diplexer

By Jessada Konpang and Natchayathorn Wattikornsirikul
Progress In Electromagnetics Research C, Vol. 112, 45-54, 2021
doi:10.2528/PIERC21032102

Abstract

A high selectivity microstrip dual-mode diplexer with a stepped-impedance opened-end structure is implemented to reduce the size of a dual-mode resonator and suppress the harmonics. The proposed dual-mode resonator structure consists of a microstrip half-wavelength resonator and an open-circuited stepped-impedance stub. The stepped-impedance opened-end structure can control an even mode in the upper and lower desired bands to improve the cutoff responses. The sharp cutoff selectivity of the filter is created to improve the diplexer performance and wide suppress harmonics. The dual-mode diplexer prototype is analyzed, fabricated, and measured. The measured result agrees well with the analyzed result. The simulated and measured dual-mode diplexers are designed at the operational frequency of Tx/Rx at 1.95 GHz and 2.14 GHz, respectively. It is shown that the dual-mode filter has a wide stopband, including the first spurious resonance frequency due to the stepped-impedance stub.

Citation


Jessada Konpang and Natchayathorn Wattikornsirikul, "An Analysis of High Selectivity and Harmonic Suppression Based on Stepped-Impedance Resonator Structure for Dual-Mode Diplexer," Progress In Electromagnetics Research C, Vol. 112, 45-54, 2021.
doi:10.2528/PIERC21032102
http://jpier.org/PIERC/pier.php?paper=21032102

References