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http://dx.doi.org/10.5515/KJKIEES.2010.21.1.028

A Design of the UWB Bandpass Filter with a Good Performance of the Stopband, and Notched Band in Passband  

An, Jae-Min (Department of Electronic and Computer Engineering, Chonnam National University)
Kim, Yu-Seon (Department of Electronic and Computer Engineering, Chonnam National University)
Pyo, Hyun-Seong (Department of Electronic and Computer Engineering, Chonnam National University)
Lee, Hye-Sun (Department of Electronic and Computer Engineering, Chonnam National University)
Lim, Yeong-Seog (Department of Electronic and Computer Engineering, Chonnam National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.1, 2010 , pp. 28-35 More about this Journal
Abstract
In this paper, we designed and fabricated a ultra-wideband(UWB) bandpass filter with a good performance of a stopband, and a notched band in passband. The transformed equivalent circuit of the highpass filter was realized by distributed element. A wide-passband with 3-dB fractional bandwidth of more than 100 % was achieved by using optimum response of the HPF. For improving lower and upper stopband characteristic, a cross coupling between feed lines was employed, which was analyzed by desegmentation technique. In order to reject interference of Wireless LAN and Hyper LAN(5.15~5.825 GHz), the narrow notched(rejection) band was realized by a spurline. The fabricated BPF indicated the passband from 3.1 to 10.55 GHz and the flat group delay of less than 0.94 ns over the entire passband except the rejection band. The filter shown sharp attenuation both inside and outside the band and notched band from 5.2 to 6.12 GHz.
Keywords
Ultra-WideBand(UWB); Bandpass Filter; I/O Cross Coupling; Desegmentation Technique; Spurline;
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