A 3.1 to 5 GHz Low-Loss Planar Filter for MB-OFDM UWB Applications

Young-Pyo HONG  Seong-Sik MYOUNG  Jong-Gwan YOOK  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.4   pp.1098-1101
Publication Date: 2011/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1098
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
low loss,  miniaturized filter,  planar filter,  ultra-wideband filter,  parallel-coupled line filter,  

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Summary: 
A low-loss ultra-wide band (UWB) filter is presented, which uses miniaturized parallel coupled line along with an standard printed circuit board (PCB) technology. By analyzing even- and odd-mode impedances (in comparison with conventional parallel coupled lines) of miniaturized parallel coupled line, this structure provides tight coupling, thus, relaxing the requirements on physical dimensions width and spacing when designing broadband filters. A bandpass filter for Mode 1 (the first 3 sub-bands) in the 3.1-5 GHz band for Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) UWB is realized and compared with a conventional parallel coupled line filter. The experimental results show as much as 0.9 dB insertion loss improvement over the conventional counterpart.