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Paper Abstract and Keywords
Presentation 2007-05-22 11:15
Suspended Coupled Balun for Microwave Band Using Multi-Layer Liquid Crystal Polymer Substrate
Futoshi Takeuchi, Suguru Kameda, Hiroyuki Nakase, Tadashi Takagi, Kazuo Tsubouchi (Tohoku Univ.) MW2007-24
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents a suitable structure of a balun using a multi-layer substrate. In a conventional planar balun, it is necessary to narrow the space between the coupled lines for obtaining wideband characteristics, but the space between coupled lines has constraints of the production process. Since coupled line of the proposed balun is a suspended line using the multi-layer wiring structure, the coupling factor can be large without constraints of the production process. The wider bandwidth characteristics can be obtained easily. The proposed balun has the perfect symmetrical circuit to realize wideband and good balance characteristics at high frequency. We fabricated the balun using Liquid Crystal Polymer (LCP) substrate for the 5GHz band. From the measurement result, the frequency range of 1dB increase from the minimum value of the transmission loss is 3.23 - 6.15GHz (bandwidth of 2.92GHz, fractional bandwidth of 58.4%, and center frequency of 5GHz), the amplitude differences were within 0+-1dB and phase differences were 180[deg.]+-10[deg.] over the frequency range of 3.23 - 6.15GHz respectively.
Keyword (in Japanese) (See Japanese page) 
(in English) Balun / Multi-Layer Substrate / Liquid Crystal Polymer / Microwave / 5GHz / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 49, MW2007-24, pp. 67-72, May 2007.
Paper # MW2007-24 
Date of Issue 2007-05-14 (MW) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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  
Conference Date 2007-05-21 - 2007-05-22 
Place (in Japanese) (See Japanese page) 
Place (in English) University of Hyogo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave Technologies 
Paper Information
Registration To MW 
Conference Code 2007-05-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Suspended Coupled Balun for Microwave Band Using Multi-Layer Liquid Crystal Polymer Substrate 
Sub Title (in English)  
Keyword(1) Balun  
Keyword(2) Multi-Layer Substrate  
Keyword(3) Liquid Crystal Polymer  
Keyword(4) Microwave  
Keyword(5) 5GHz  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Futoshi Takeuchi  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Suguru Kameda  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Hiroyuki Nakase  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Tadashi Takagi  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
5th Author's Name Kazuo Tsubouchi  
5th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2007-05-22 11:15:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2007-24 
Volume (vol) vol.107 
Number (no) no.49 
Page pp.67-72 
#Pages 6 
Date of Issue 2007-05-14 (MW) 

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