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Paper Abstract and Keywords
Presentation 2019-03-15 14:55
An Automated Design Method of Microstrip BPF with Transmission Zeros Using Both Forward and Inverse Models of Neural Network
Ao Yamashita, Masataka Ohira, Zhewang Ma (Saitama Univ.) MW2018-178 ICD2018-122
Abstract (in Japanese) (See Japanese page) 
(in English) A forward model of neural-network (NN) using poles and residues in rational function of S parameters has already been proposed to rapidly calculate frequency characteristics of microwave bandpass filters (BPF) from structural parameters, which may be suitable for optimization designs of BPF with transmission zeros (TZs). However, the conventional method has two problems: one is that initial values of optimization cannot be determined by the forward model, and the other is that the forward model becomes complicated because the number of parameters to be treated in NN is sextuple the filter order. To solve the problems, in this paper, we propose an automatic optimization design method of BPF with TZs using both forward and inverse models of NN. In the proposed method, a new forward model of NN is introduced to evaluate TZ frequency positions in addition to the forward model for passband evaluation, leading to reduce the number of parameters to be treated in NN. Thus, the proposed method makes it possible to find good initial values with inverse model, and efficiently optimize structural parameters of BPF thanks to two forward models. As an example, we demonstrate that a fourth-order microstrip BPF with two TZs is automatically designed just by inputting a theoretically synthesized coupling matrix. The effectiveness of the proposed method is proven by comparing EM simulated frequency responses of the designed filter with ideal ones.
Keyword (in Japanese) (See Japanese page) 
(in English) Bandpass filter / neural network / automatic design / / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 506, MW2018-178, pp. 121-126, March 2019.
Paper # MW2018-178 
Date of Issue 2019-03-07 (MW, ICD) 
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 MW2018-178 ICD2018-122

Conference Information
Committee MW ICD  
Conference Date 2019-03-14 - 2019-03-15 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave Integrated Circuit/Microwave Technologies 
Paper Information
Registration To MW 
Conference Code 2019-03-MW-ICD 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Automated Design Method of Microstrip BPF with Transmission Zeros Using Both Forward and Inverse Models of Neural Network 
Sub Title (in English)  
Keyword(1) Bandpass filter  
Keyword(2) neural network  
Keyword(3) automatic design  
1st Author's Name Ao Yamashita  
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 2019-03-15 14:55:00 
Presentation Time 25 
Registration for MW 
Paper # IEICE-MW2018-178,IEICE-ICD2018-122 
Volume (vol) IEICE-118 
Number (no) no.506(MW), no.507(ICD) 
Page pp.121-126 
#Pages IEICE-6 
Date of Issue IEICE-MW-2019-03-07,IEICE-ICD-2019-03-07 

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