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Paper Abstract and Keywords
Presentation 2015-12-17 15:15
A Single-layer Planar Filter Structure to Realize Fully Canonical Cul-de-Sac Coupling Matrix and Design of Bandpass Filters with Transmission Zeros
Toshiki Kato, Masataka Ohira, Zhewang Ma (Saitama Univ.) MW2015-142 Link to ES Tech. Rep. Archives: MW2015-142
Abstract (in Japanese) (See Japanese page) 
(in English) A Cul-de-Sac coupling matrix can be obtained by matrix transformation from a transversal array coupling matrix that can synthesize a bandpass filter with transmission zeros (TZs) at arbitrary frequencies, and also it does not need a multi-branch circuit for excitation. So far a waveguide filter and a two-layer microstrip filter have been reported to provide the Cul-de-Sac coupling matrix, but the Cul-de-Sac coupling matrix has not been realized by a single-layer planar structure yet. In this paper, we propose a single-layer planar microstrip structure to implement a fully canonical Cul-de-Sac coupling matrix that can produce the maximum number of TZs. For the filter design considering a frequency-dependent direct S/L coupling, a circuit synthesis with the help of optimization technique is introduced, so that a bandpass filter can be easily designed with evaluation of coupling coefficient and external Q factor. As an example, we design a bandpass filter with 2-GHz center frequency, 6% bandwidth in passband, and four TZs located very near the passband, resulting in very high skirt selectivity. Finally, the validity of the proposed structure is verified by the comparison between the simulated and measured results.
Keyword (in Japanese) (See Japanese page) 
(in English) Bandpass filters / transmission zeros / fully Canonical Cul-de-Sac coupling matrix / direct S/L coupling / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 372, MW2015-142, pp. 53-58, Dec. 2015.
Paper # MW2015-142 
Date of Issue 2015-12-10 (MW) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF MW2015-142 Link to ES Tech. Rep. Archives: MW2015-142

Conference Information
Committee MW  
Conference Date 2015-12-17 - 2015-12-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Univ. of Science 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Students Session / Microwave Technologies 
Paper Information
Registration To MW 
Conference Code 2015-12-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Single-layer Planar Filter Structure to Realize Fully Canonical Cul-de-Sac Coupling Matrix and Design of Bandpass Filters with Transmission Zeros 
Sub Title (in English)  
Keyword(1) Bandpass filters  
Keyword(2) transmission zeros  
Keyword(3) fully Canonical Cul-de-Sac coupling matrix  
Keyword(4) direct S/L coupling  
1st Author's Name Toshiki Kato  
1st Author's Affiliation Saitama University (Saitama Univ.)
2nd Author's Name Masataka Ohira  
2nd Author's Affiliation Saitama University (Saitama Univ.)
3rd Author's Name Zhewang Ma  
3rd Author's Affiliation Saitama University (Saitama Univ.)
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Speaker Author-1 
Date Time 2015-12-17 15:15:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2015-142 
Volume (vol) vol.115 
Number (no) no.372 
Page pp.53-58 
Date of Issue 2015-12-10 (MW) 

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