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Switchable square ring bandpass to bandstop filter for ultra-wideband applications

Published online by Cambridge University Press:  14 October 2015

Mushtaq Alqaisy ,
Chandan K. Chakrabraty ,
Jawad K. Ali ,
Adam Reda Alhawari  and
Tale Saeidi
Mushtaq Alqaisy*
Affiliation:
Department of Electronics and Communication Engineering, College of Engineering, Universiti Tenaga Nasional, Malaysia. Phone: +60122497145 Ministry of Science and Technology, Baghdad, Iraq
Chandan K. Chakrabraty
Affiliation:
Department of Electronics and Communication Engineering, College of Engineering, Universiti Tenaga Nasional, Malaysia. Phone: +60122497145
Jawad K. Ali
Affiliation:
Microwave Research Group, Department of Electrical Engineering, University of Technology, Assinaa Street, 10066, Baghdad, Iraq
Adam Reda Alhawari
Affiliation:
Centre of Excellence for Wireless and Photonics Network, Department of Computer and Communication Systems Engineering, Faculty of Engineering, Universiti Putra Malaysia, Malaysia
Tale Saeidi
Affiliation:
Centre of Excellence for Wireless and Photonics Network, Department of Computer and Communication Systems Engineering, Faculty of Engineering, Universiti Putra Malaysia, Malaysia
*
Corresponding author: M. Alqaisy Email: mushtaq_alqaisy@yahoo.com
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Abstract

In this manuscript, serial-shunt of square ring resonators with step-impedance open circuited stub resonators to produce a new on-off switchable bandpass to bandstop response in the same ultra-wideband microstrip filter structure is proposed. The closed ring of series-shunt square ring resonators with a combine stubs are introduced to excite the bandpass response while bandstop characteristic excited when gaps are embedded in the corners of the square ring resonators. The main advantage of this microstrip filter is its capability to switch from bandpass-to-bandstop operation using open-short gap, respectively. A microwave simulator is utilized to show the switchable case by replacing Skyworks radio frequency diodes (RF-PIN) instead of those gaps. The entire filter models have been simulated using the computer simulation technology (CST) Microwave Studio. The computed results for the proposed filters were compared with the measured results of the both prototype structures (bandpass- and bandstop-filter). The codes also showed good agreement between them. Other advantages include being small in size, and low in effective cost.

Keywords

Switchable filterRing resonatorPIN diodeTransmission zeroRoll-off
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 1 , February 2017 , pp. 51 - 60
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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