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Paper Abstract and Keywords
Presentation 2016-01-14 13:00
Design of Fully Canonical Cul-de-Sac Coupling Microstrip Filters Having Transmission Zeros for Symmetric and Asymmetric Frequency Responses
Toshiki Kato, Masataka Ohira, Zhewang Ma (Saitama Univ.) MW2015-159 Link to ES Tech. Rep. Archives: MW2015-159
Abstract (in Japanese) (See Japanese page) 
(in English) A microwave bandpass filter having a generalized Chebyshev function characteristic can generate transmission zeros at arbitrary frequencies in stopbands. Thus, it is possible to realize a symmetric or asymmetric frequency response with respect to the center frequency of passband. As such versatility can be more attractive than conventional characteristic functions, we have proposed a fully canonical Cul-de-Sac coupling microstrip filter to provide a generalized Chebyshev function with a single-layer planar filter structure. However, a direct source/load(S/L) coupling appearing in the filter, which is greater than a desired value obtained by the circuit synthesis, may degrade stopband responses. In this paper, we propose a new fully canonical Cul-de-Sac coupling filter structure that can suppress the direct S/L coupling by using a novel excitation structure for resonators. The proposed filter structure allows us to adjust the direct S/L coupling, thereby realizing fully canonical filters having the maximum number of transmission zeros. To show the effectiveness, we have designed three fourth-order bandpass filters with four transmission zeros located at symmetric or asymmetric frequency positions with respect to the same passband response.
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. 391, MW2015-159, pp. 1-6, Jan. 2016.
Paper # MW2015-159 
Date of Issue 2016-01-07 (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 MW2015-159 Link to ES Tech. Rep. Archives: MW2015-159

Conference Information
Committee MW  
Conference Date 2016-01-14 - 2016-01-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave Technologies / 50th Anniversary Special Talks 
Paper Information
Registration To MW 
Conference Code 2016-01-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Design of Fully Canonical Cul-de-Sac Coupling Microstrip Filters Having Transmission Zeros for Symmetric and Asymmetric Frequency Responses 
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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Date Time 2016-01-14 13:00:00 
Presentation Time 30 minutes 
Registration for MW 
Paper # MW2015-159 
Volume (vol) vol.115 
Number (no) no.391 
Page pp.1-6 
Date of Issue 2016-01-07 (MW) 

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