volume | PIER Journals

2019-03-20

Electronically Switchable Ultra-Wide Band /Dual-Band Bandpass Filter Using Defected Ground Structures

Eman Gamal Ouf,

Dr. Eman Gamal Ouf

Electronics Research Institute

Egypt

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Esmat A. F. Abdallah,

Dr. Esmat A. F. Abdallah

Microstrip Department

Electronics Research Institute

Egypt

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Ashraf Shouki Seliem Mohra,

Prof. Ashraf Shouki Seliem Mohra

Department of Electrical Engineering, Faculty of Engineering

University of Benha

Egypt

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Hadia El-Hennawy

Professor Hadia El-Hennawy

Electronics and Communications Dept.

Ain Shams University

Egypt

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Progress In Electromagnetics Research C, Vol. 91, 83-96, 2019

doi:10.2528/PIERC19010702

Abstract

In this paper, an electronically switchable ultra-wideband (UWB)/dual-band bandpass filter using defected ground structures (DGSs) is proposed. The proposed filter consists of meandered inter-digital coupled line sections, stepped impedance open stubs, coupled lines, and rectangular DGSs to realize high performance in the operation band with a compact size of 12.5 mm × 10 mm. The proposed filter is designed on an RT/Teflon substrate (ε_r = 2.2, h = 0.7874 mm). The main advantage of the proposed filter is the reconfiguration of ultra-wide bandpass filter to dual-band bandpass filter. UWB has passband from 3.6 GHz to 10.6 GHz with upper wide stopband attenuation better than 20 dB up to 18 GHz. The dual passbands extend from 3.8 GHz to 5 GHz and from 9.5 GHz to 10.8 GHz. This filter is able to provide interference immunity from unwanted radio signals, such as wireless local area networks (WLAN), worldwide interoperability for microwave access (WIMAX) that cohabit within the UWB spectrum, and X (Military) band of satellite from 7 GHz to 8 GHz. The state of filter can be changed by using switching matrix equipment (mini circuit, replacement of PIN diodes). To validate the design theory, an electronically switchable UWB/dual-band bandpass filter using DGSs is designed, fabricated, and measured. Good agreement is found between simulated and measured results.

Citation

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Eman Gamal Ouf, Esmat A. F. Abdallah, Ashraf Shouki Seliem Mohra, and Hadia El-Hennawy, "Electronically Switchable Ultra-Wide Band /Dual-Band Bandpass Filter Using Defected Ground Structures," Progress In Electromagnetics Research C, Vol. 91, 83-96, 2019.
doi:10.2528/PIERC19010702

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