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Paper Abstract and Keywords
Presentation 2019-01-18 14:50
Design of Microstrip Tunable Filtering Antenna with Constant Absolute Bandwidth
Tomoyasu Soma, Masataka Ohira, Zhewang Ma (Saitama Univ.) ED2018-87 MW2018-154 Link to ES Tech. Rep. Archives: ED2018-87 MW2018-154
Abstract (in Japanese) (See Japanese page) 
(in English) A tunable antenna that can change its resonant frequency electronically is one of promising components for future wireless communications. Conventional tunable antennas have problems that the return loss characteristic is worse, and the frequency bandwidth is narrower as the resonant frequency is tuned with a varactor diode. To overcome these disadvantages, the co-design approach of tunable bandpass filter and antenna have been applied to a varactor-tuned antenna. However, a constant frequency bandwidth has not been realized yet with a tunable filtering antenna, since frequency characteristics of circuit parameters, such as coupling coefficients, external Q factor, and radiation Q factor, do not meet their requirements determined from a well-established filter theory. This paper proposes a new microstrip tunable filtering antenna having a constant frequency bandwidth, and also presents its design method. As an example, we design a third-order tunable filtering antenna under design specifications of a tuning center-frequency range 1.94-2.16 GHz and a constant frequency bandwidth 60 MHz. The effectiveness of the proposed tunable filtering antenna is verified through fabrication and measurement.
Keyword (in Japanese) (See Japanese page) 
(in English) tunable antenna / filtering antenna / varactor diode / absolute frequency bandwidth / / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 403, MW2018-154, pp. 97-102, Jan. 2019.
Paper # MW2018-154 
Date of Issue 2019-01-10 (ED, MW) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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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)
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Conference Information
Committee MW ED  
Conference Date 2019-01-17 - 2019-01-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Hitachi, Central Research Lab. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Compound semiconductor, High speed and High frequency devices/Microwave technologies 
Paper Information
Registration To MW 
Conference Code 2019-01-MW-ED 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Design of Microstrip Tunable Filtering Antenna with Constant Absolute Bandwidth 
Sub Title (in English)  
Keyword(1) tunable antenna  
Keyword(2) filtering antenna  
Keyword(3) varactor diode  
Keyword(4) absolute frequency bandwidth  
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1st Author's Name Tomoyasu Soma  
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 2019-01-18 14:50:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # ED2018-87, MW2018-154 
Volume (vol) vol.118 
Number (no) no.402(ED), no.403(MW) 
Page pp.97-102 
#Pages
Date of Issue 2019-01-10 (ED, MW) 


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