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Paper Abstract and Keywords
Presentation 2016-05-19 15:50
A Novel 4-Port Lumped Element Circulator for High-isolation Front-end system
Kei Matsutani, Takaya Wada, Yusuke Kusumoto, Masayoshi Koshino, Makoto Kawashima (Murata) MW2016-11 Link to ES Tech. Rep. Archives: MW2016-11
Abstract (in Japanese) (See Japanese page) 
(in English) A novel 4-port circulator for multi-standard and multi-band cellular handsets has been successfully developed by
using the Core-Circulator technique. The circulator is realized with lumped element circuits and a weak magnetic field
operation. The insertion loss of 1.3dB maximum in 777-787MHz (Band 13) and the TX-RX isolation of 20dB minimum in 35% fractional bandwidth which is including cellular whole low-band have been obtained. Its size is 2.0 mm width X 2.0 mm length X 0.5 mm height. Experimental results of the combination of conventional SAW filters and the developed 4-port circulator have exhibited an extremely high isolation performance of 79dB and robustness against variations of antenna impedance.
Keyword (in Japanese) (See Japanese page) 
(in English) Lumped element microwave circuit / circulator / duplexer / ferrites / microwave devices / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 51, MW2016-11, pp. 11-14, May 2016.
Paper # MW2016-11 
Date of Issue 2016-05-12 (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 MW2016-11 Link to ES Tech. Rep. Archives: MW2016-11

Conference Information
Committee MW  
Conference Date 2016-05-19 - 2016-05-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave Technologies 
Paper Information
Registration To MW 
Conference Code 2016-05-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Novel 4-Port Lumped Element Circulator for High-isolation Front-end system 
Sub Title (in English)  
Keyword(1) Lumped element microwave circuit  
Keyword(2) circulator  
Keyword(3) duplexer  
Keyword(4) ferrites  
Keyword(5) microwave devices  
1st Author's Name Kei Matsutani  
1st Author's Affiliation Murata Manufacturing Co., Ltd. (Murata)
2nd Author's Name Takaya Wada  
2nd Author's Affiliation Murata Manufacturing Co., Ltd. (Murata)
3rd Author's Name Yusuke Kusumoto  
3rd Author's Affiliation Murata Manufacturing Co., Ltd. (Murata)
4th Author's Name Masayoshi Koshino  
4th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata)
5th Author's Name Makoto Kawashima  
5th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata)
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Speaker Author-1 
Date Time 2016-05-19 15:50:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2016-11 
Volume (vol) vol.116 
Number (no) no.51 
Page pp.11-14 
Date of Issue 2016-05-12 (MW) 

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