A Study and Design of LPF Using Hairpin Structural Circuit and Chip Capacitor

Shohei HASEGAWA  Takenori YASUZUMI  Tomoki UWANO  Osamu HASHIMOTO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.7   pp.1135-1137
Publication Date: 2010/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.1135
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
low-pass filters,  coupled line,  attenuation pole,  chip capacitor,  

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Summary: 
In this paper, a microstrip lowpass filter using hairpin structure and Chip-Capacitor is proposed. Firstly, the LPF with one hairpin element is briefly designed and optimized with LC prototype structure using circuit simulator. With the capacitor loaded the proposed LPF illustrates the sharp attenuation performance near the cut-off frequency and the wideband rejection characteristics. Then, in order to improve the stopband attenuation the three-hairpin LPF is studied. By optimazing its design the attenuation is improved by 32 dB.