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Compact D-CRLH resonator for low-pass filter with wide rejection band, high roll-off, and transmission zeros

Published online by Cambridge University Press:  05 November 2018

Dilip Kumar Choudhary
Affiliation:
Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, India
Mahmoud A. Abdalla
Affiliation:
Electromagnetic Waves Group, Electronic Engineering Department, Military Technical College, Cairo, Egypt
Raghvendra Kumar Chaudhary*
Affiliation:
Department of Electronics Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad-826004, India
*
Author for correspondence: Raghvendra Kumar Chaudhary, E-mail: raghvendra.chaudhary@gmail.com

Abstract

A compact low-pass filter (LPF) with wide rejection band based on T-type circuit of an enhanced dual composite right-/left-handed (D-CRLH) resonator is presented in this paper. The resonator has only one cell with series and parallel tank circuit. The parallel LC tank circuit has been realized by an interdigital capacitor and one shorted finger, whereas its series LC tank circuit is realized by an air gap capacitance and a short circuit stub. The filter has wide rejection band bandwidth with three transmission zeros (TZs). The filter bandwidth and TZs frequencies are controlled by the D-CRLH element values. The results of the proposed filter demonstrate minimum insertion loss in passband, high roll-off rate, and good figure of merit. The measured results are in good agreement with the simulated results. The detailed filter design is discussed in terms of circuit modeling, dispersion analysis, and full-wave simulation. Finally, the filter size is compact (0.10 λg × 0.15 λg) at cut-off frequency.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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