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Paper Abstract and Keywords
Presentation 2018-12-13 10:10
A High-order Cul-de-Sac Coupling Bandpass Filter Design Using Even/Odd-mode Stepped Impedance Resonators
Ryo Mikase, Masataka Ohira, Zhewang Ma (Saitama Univ.) MW2018-115 Link to ES Tech. Rep. Archives: MW2018-115
Abstract (in Japanese) (See Japanese page) 
(in English) In the design of bandpass filters (BPFs), transmission zeros (TZs) can be generated at arbitrary frequency positions by using a generalized Chebyshev function, thereby providing a high degree of freedom for filter synthesis. A fully canonical N-th order Cul-de-Sac BPF can generate up to N TZs, which is the maximal number that can be produced by the filter synthesis theory. In order to generate N TZs, a source to load coupling must be introduced, resulting in low attenuation level at stopband. To solve this problem, a novel Cul-de-Sac coupling topology having two resonators between source and load is introduced in this paper for large attenuation level at stopband. In addition, a microstrip BPF realizing the novel Cul-de-Sac coupling topology is also proposed. The proposed BPF employs even/odd-mode stepped impedance resonators for a wide stopband response. The effectiveness of the proposed Cul-de-Sac BPF are demonstrated through two design examples. The first design example is a fifth-order BPF having two TZs at lower stopband and one TZ at upper stopband, while the second one is a sixth-order BPF which having two TZs at symmetric frequency positions with respect to center frequency. The validity of the proposed Cul-de-Sac coupling topology and its microstrip BPF structure is verified by the comparison of the frequency responses between EM-simulated and measured results.
Keyword (in Japanese) (See Japanese page) 
(in English) bandpass filter / transmission zeros / coupling matrix / Cul-de-Sac coupling / stepped impedance resonators / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 361, MW2018-115, pp. 7-12, Dec. 2018.
Paper # MW2018-115 
Date of Issue 2018-12-06 (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 MW2018-115 Link to ES Tech. Rep. Archives: MW2018-115

Conference Information
Committee MW  
Conference Date 2018-12-13 - 2018-12-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Kanagawa Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To MW 
Conference Code 2018-12-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A High-order Cul-de-Sac Coupling Bandpass Filter Design Using Even/Odd-mode Stepped Impedance Resonators 
Sub Title (in English)  
Keyword(1) bandpass filter  
Keyword(2) transmission zeros  
Keyword(3) coupling matrix  
Keyword(4) Cul-de-Sac coupling  
Keyword(5) stepped impedance resonators  
1st Author's Name Ryo Mikase  
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 2018-12-13 10:10:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2018-115 
Volume (vol) vol.118 
Number (no) no.361 
Page pp.7-12 
Date of Issue 2018-12-06 (MW) 

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