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Quad notched-band UWB BPF based on quintuple-mode resonator

Published online by Cambridge University Press:  27 June 2017

Seyyed Jamal Borhani
Affiliation:
Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
Mohammad Amin Honarvar*
Affiliation:
Department of Electrical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Isfahan, Iran
Bal S. Virdee
Affiliation:
Faculty of Life Sciences and Computing, Centre for Communications Technology, London Metropolitan University, London, UK
*
Corresponding author: M.A. Honarvar Email: Amin.Honarvar@pel.iaun.ac.ir

Abstract

The design of a novel microstrip ultra-wideband (UWB) bandpass filter with quad narrow notched-band functionality is presented. The filter consists of a multi-mode resonator (MMR) constituted from two modified stepped-impedance stubs that generate six resonate modes, five of which are within the UWB passband where the sixth mode is used to extend the upper stopband of the filter. Two transmission zeroes are located at the 3-dB edge of the passband to enhance the filter's selectivity with a skirt factor of 0.955. The MMR is fed through asymmetric interdigital coupled-lines feed to produce controllable notched-band. Additional notched-bands are generated with a parasitic coupled line. The notched-bands are centered exactly to eliminate interference at 5.2 GHz (wireless local area network (WLAN)), 5.8 GHz (WLAN), 6.8 GHz (radio-frequency identification), and 8 GHz (X-band). Good agreement is obtained between simulation and measurement results. The highly compact filter has dimensions of 8.0 × 9.83 mm2.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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