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RETRACTED

This article has been retracted as it is essentially identical in content with the published article “Design of Compact UWB Band Pass Filter with WLAN Notch,” by Satish Chand Gupta and Mithilesh Kumar, published in the Proceedings of the National Conference on Trends in Signal Processing & Communication (TSPC’11) 10–12 March, 2011 at Bhagwant Institute of Technology, Muzaffarnagar, India.

International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 971097, 4 pages
http://dx.doi.org/10.1155/2012/971097
Research Article

Design of UWB Filter with WLAN Notch

Department of ECE, Bhagwant Institute of Technology, Muzaffarnagar 251315, India, IIT Delhi, New Delhi 110016, India

Received 11 August 2011; Revised 23 November 2011; Accepted 24 December 2011

Academic Editor: Deb Chatterjee

Copyright © 2012 Harish Kumar and MD. Upadhayay. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

UWB technology- (operating in broad frequency range of 3.1–10.6 GHz) based filter with WLAN notch has shown great achievement for high-speed wireless communications. To satisfy the UWB system requirements, a band pass filter with a broad pass band width, low insertion loss, and high stop-band suppression are needed. UWB filter with wireless local area network (WLAN) notch at 5.6 GHz and 3 dB fractional bandwidth of 109.5% using a microstrip structure is presented. Initially a two-transmission-pole UWB band pass filter in the frequency range 3.1–10.6 GHz is achieved by designing a parallel-coupled microstrip line with defective ground plane structure using GML 1000 substrate with specifications: dielectric constant 3.2 and thickness 0.762 mm at centre frequency 6.85 GHz. In this structure a λ/4 open-circuited stub is introduced to achieve the notch at 5.6 GHz to avoid the interference with WLAN frequency which lies in the desired UWB band. The design structure was simulated on electromagnetic circuit simulation software and fabricated by microwave integrated circuit technique. The measured VNA results show the close agreement with simulated results.