Design of Dual Mode SIR Band pass Filter for Wireless Communication Applications
Emad S. Ahmed1, Hanan J. Abdulkareem2
1Emad S. Ahmed, Department of Electrical Engineering, University of Technology, Baghdad, Iraq.
2Hanan J. Abdulkareem, Department of Electrical Engineering, University of Technology, Baghdad, Iraq.
Manuscript received on July 19, 2013. | Revised Manuscript received on August 03, 2013. | Manuscript published on August 30, 2013. | PP: 173-175 | Volume-2, Issue-6, August 2013.  | Retrieval Number: F2017082613/2013©BEIESP

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Abstract: In this paper, a new design of microstrip dual-mode bandpass filter using stepped impedance resonators (SIRs) is introduced. The filter consists of a two coupled SIR resonators with a 50 ohm impedance port. The presented dual-mode filter works at 2.4 GHz and 2.89 GHz for industrial, scientific and medical (ISM), closed circuit television (CCTV) and wireless local area networks (WLANs). The filter is designed and simulated using commercial electromagnetic simulator CST microwave studio 2009. The return losses of the filter at the operating frequencies are -32.469 dB and -26.18 dB respectively. The filter shows good insertion losses of 0.37 and 0.24 dB within the operating bands and a good out-of- band rejection more than 25 d B.
Keywords: Dual-mode filter, Stepped-impedance resonators, Wireless local area network.