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J. Electromagn. Eng. Sci > Volume 10(3); 2010 > Article
Journal of the Korean Institute of Electromagnetic and Science 2010;10(3):92-98.
DOI: https://doi.org/10.5515/JKIEES.2010.10.3.092   
Wideband Bandstop Filter Based on Capacitively Coupled λ/4 Short-Circuited Lines
Thai Hoa Duong1, Ihn-Seok Kim2
1University of Melborn
2College of Electronics & Information, Kyung Hee University
Abstract
A new wideband bandstop filter(BSF) with a sharp roll-off characteristic is introduced in a stripline structure in this paper. The BSF consists of two sections: the first is two capacitively coupled $lambda/4$ short-circuited lines with opposite ground positions, while the second is a capacitively coupled $lambda/4$ short-circuited line. The BSF provides three transmission zeros within the stopband and better than 22 dB rejection over the whole wireless local area network (WLAN) band from 5.15 to 5.825 GHz. The BSF, cascaded to an U.S. ultra-wideband(UWB: 3.1~10.6 GHz) band-pass filter(BPF), is simulated with HFSS and realized with low-temperature co-fired ceramic(LTCC) green tape with a dielectric constant of 7.8. The measurement results agree well with the HFSS simulation results. The size of the UWB BPF including the BSF is $3{times}6.3times0.45;mm^3$.
Key words: Ultra Wideband(UWB), Bandpass Filter(BPF), Wireless Local Area Network(WLAN), Bandstop Filter(BSF), Capacitive Coupling, Capacitively Coupled $\lambda/4$ Short-Circuited Lines, Low-Temperature Co-fired Ceramics(LTCC)
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