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UWB bandpass filter with notched band using broadside-coupled microstrip-coplanar waveguide structure

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5 Author(s)
Bowen Liu ; Nat. Lab. of Antennas & Microwave Technol., Xidian Univ., Xi''an, China ; Yingzeng Yin ; Yi Yang ; Yuqing Wei
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In this paper, a novel and compact ultra-wideband (UWB) bandpass filter with a narrow notched band in the UWB passband using broadside-coupled microstrip-coplanar waveguide (CPW) structure is presented. To avoid the interference with the WLAN system, the operation band centered at 5.8 GHz (5.725-5.825 GHz) is notched by embedding open stubs in the microstrip lines. The resonances of stubs introduce a narrow rejection band in the UWB passband. Another two symmetric open stubs are etched on the feed lines to improve the property of the upper-stopband. The filter prototype is optimized and fabricated to demonstrate the notch-band-included and upper-stopband-improved UWB bandpass performances. Good agreement is found between the simulated and measured results.

Published in:

Microwave Technology & Computational Electromagnetics (ICMTCE), 2011 IEEE International Conference on

Date of Conference:

22-25 May 2011