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A compact planar diplexer based on via-free CRLH TL for WiMAX and WLAN applications

Published online by Cambridge University Press:  03 December 2018

Abhishek Kumar
Affiliation:
Department of Electronics and Communication Engineering, Birla Institute of Technology (BIT), Mesra, Ranchi, Jharkhand 835215, India
Dileep Kumar Upadhyay
Affiliation:
Department of Electronics and Communication Engineering, Birla Institute of Technology (BIT), Mesra, Ranchi, Jharkhand 835215, India
Corresponding
E-mail address:

Abstract

In this paper, design and development of a via-free composite right/left handed transmission line (CRLH TL)-based diplexer for WiMAX and WLAN bands is reported. The diplexer is having two channels, where each channel consists of a separate bandpass filter (BPF). The BPF of both channels are designed on via-free CRLH TLs based on a newly proposed right-angled corner-modified split ring resonator (RAC-MSRR) structure. The RAC-MSRR incorporates meander paths because of which working scope of frequencies is focused for measured center frequencies (f1) 3.5 GHz with −3 dB fractional bandwidth (FBW) of 21.21% (BPF1 channel) and (f2) 5.6 GHz with −3 dB FBW of 13.29% (BPF2 channel). For diplexer design, T-section is used for joining two BPFs which results in very good isolation of more than 32.5 dB over the frequency band of 2.5–8.0 GHz. The designed diplexer has passband insertion loss of −0.87 dB at f1 and −1.25 dB at f2. Overall size of the fabricated diplexer including 50 Ω feed line is 18 × 15 mm2. Equivalent lumped circuit model parameters of the diplexer are obtained from the pseudo-inverse matrix technique. Measured results show good concurrence with simulated results and subsequently approve the proposed model design.

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

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A compact planar diplexer based on via-free CRLH TL for WiMAX and WLAN applications
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