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Highly compact UWB bandpass filter based on composite right/left-handed transmission line and meander fractal like ring slot in ground

Published online by Cambridge University Press:  21 December 2016

Babu Lal Shahu*
Affiliation:
Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Deoghar Campus, Deoghar-814142, India. Phone: +919334492400
Srikanta Pal
Affiliation:
Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi-835215, India
Neela Chattoraj
Affiliation:
Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi-835215, India
Dileep Kumar Upadhyay
Affiliation:
Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi-835215, India
*
Corresponding author: B.L. Shahu Email: sahu.babulal@gmail.com

Abstract

An ultra-wideband (UWB) highly compact bandpass filter with extremely high passband bandwidth is presented. The proposed structure is made using three-staged stepped-impedance lines and a composite right/left-handed transmission line (CRLH-TL) synthesized with meander fractal like ring slot in the ground and series capacitive gap in conductor strip. The capacitive gap in conductor strip and meander fractal like ring slot in the ground plane play major role for controlling the lower and higher cut-off frequencies. The equivalent circuit model of proposed filter is demonstrated and lumped parameters are extracted. A prototype is fabricated to experimentally validate the performance of proposed filter. The proposed UWB filter has extremely wide −10 dB return loss passband bandwidth from 3.14 to 18.26 GHz with relative bandwidth of 142% and insertion loss better than 0.5 dB. Also it achieves a wide upper-stopband from 19.7 to 24.4 GHz with insertion loss better than 13.0 dB, return loss <1.5 dB and sharpened rejection skirts outside the passband at both lower and upper frequency ends. Good agreement is found between simulated and measured results with measured group delay variation in the passband <0.65 ns.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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Highly compact UWB bandpass filter based on composite right/left-handed transmission line and meander fractal like ring slot in ground
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