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Open loop resonator bandpass filter with wide stopband using spurlines and microstrip stubs

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5 Author(s)
Xiao-Qun Chen ; Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi''an, China ; Ping Li ; Hao-Jia Lin ; Jian-Zhao Tong
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This paper presents a new microstrip open loop resonator bandpass filter (BPF) for wireless local area networks (WLAN) with wide stopband response. The proposed BPF is composed of a pair of half-wavelength open loop resonators and two additional resonators operating at the center frequency of 2.44 GHz. Two novel resonators consisted of asymmetrical spurlines and quarter-wavelength open-circuited stubs are adopted at the input/output (I/O) feed lines to improve its stopband performance. For the outband spurious respond suppression, its upper stopband attenuation loss is lower than -20 dB from 2.6 GHz to 10 GHz, without affecting the center frequency and insertion loss. Good agreement between simulated and measured results.

Published in:

Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on

Date of Conference:

8-11 May 2010

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