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A miniature fractal-based dual-mode dual-band microstrip bandpass filter design

Published online by Cambridge University Press:  24 April 2014

Mushtaq Alqaisy ,
Chandan Chakrabraty ,
Jawad Ali  and
Adam R.H. Alhawari
Mushtaq Alqaisy
Affiliation:
Department of Electronics and Communication Engineering, College of Engineering, Universiti Tenaga Nasional, Selangor, Malaysia
Chandan Chakrabraty
Affiliation:
Department of Electronics and Communication Engineering, College of Engineering, Universiti Tenaga Nasional, Selangor, Malaysia
Jawad Ali
Affiliation:
Microwave Research Group, Department of Electrical Engineering, University of Technology, Assinaa Street, 10001 Baghdad, Iraq
Adam R.H. Alhawari*
Affiliation:
Wireless and Photonics Research Centre, Department of Computer and Communication Systems Engineering, Faculty of Engineering, Universiti Putra Malaysia, Selangor, Malaysia
*
Corresponding author: A.R.H. Alhawari Email: adamreda@upm.edu.my
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Abstract

In this paper, a fractal-based complementary split-ring resonator (CSRR) has been introduced as a defected ground structure (DGS) in the ground plane of a dual-mode microstrip bandpass filter to produce a new compact filter with dual-band response. The conventional double square ring resonator structure is modified such that its inner ring is made with a fractal shape instead of a square. Measured and simulation results show that the resulting filter offers a dual passband response; the higher passband is attributed to the dual-mode microstrip ring structure, whereas the lower passband is as a result of the embedded CSRR DGS structure. In addition, the results show that the position of the lower passband could be varied, to a certain extent, without affecting the position of the higher passband by applying higher fractal iteration levels to the inner split ring. These features, together with the compact size the proposed filter offers, make it suitable for use in a wide variety of dual-band communication applications. Measured results, carried out on filter prototypes, have been found in agreement with those theoretically predicted.

Keywords

FiltersCircuit Design and Applications
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Issue 2 , April 2015 , pp. 127 - 133
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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