An Elliptic-Function Bandpass Filter Utilizing Left-Handed Operations of an Inter-Digital Coupled Line

Hiromitsu UCHIDA  Naofumi YONEDA  Yoshihiko KONISHI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.11   pp.1772-1777
Publication Date: 2008/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.11.1772
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-wave Technologies)
Category: 
Keyword: 
bandpass filter,  inter-digital coupled-line,  left-handed operations,  negative coupling,  attenuation pole,  

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Summary: 
A new elliptic-function bandpass filter (BPF) is proposed, which utilizes an inter-digital coupled line (IDCPL) as a left-handed transmission line. The IDCPL is employed in order to realize a negative coupling between non-adjacent resonators in a wideband BPF. As the authors' knowledge, the left-handed operations of the IDCPL has rarely utilized before, although the IDCPL itself has been widely used in many microwave circuits without being paid attention to the left-handed operations. Measured characteristics of two BPFs are presented in this paper, one is targeted for 3-4 GHz WiMAX systems, and the other is for 3-5 GHz ultra wideband communication systems (UWB).