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Paper Abstract and Keywords
Presentation 2014-09-19 12:35
A Miniaturized Broadband Lumped Element Circulator for Tunable Front-end system
Reiji Nakajima, Yuki Nakaike, Takaya Wada, Makoto Kawashima (Murata Manufacturing) MW2014-94 Link to ES Tech. Rep. Archives: MW2014-94
Abstract (in Japanese) (See Japanese page) 
(in English) A novel miniaturized broadband circulator for reconfigurable mobile handsets has been successfully developed. The circulator operating in a weak magnetic field below ferromagnetic resonance are derived by analyzing the equivalent circuit. The operating theory of the circulator has been confirmed by using the perturbation theory. The usable isolation band could be expanded to 1.71GHz to 2.17GHz, which is a very small sized 1.2 × 1.0 × h0.5 mm such as 1/25 compared with the conventional one, Core-Circulator is realized. The developed circulator keeps characteristics as the insertion loss of 1.1dB maximum and the TX-RX isolation of 21dB minimum which have achieved the requirements of the tunable RF front-end.
Keyword (in Japanese) (See Japanese page) 
(in English) Admittance matrix / Lumped element microwave circuit / circulators / a weak magnetic field / ferrites / microwave devices / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 219, MW2014-94, pp. 49-53, Sept. 2014.
Paper # MW2014-94 
Date of Issue 2014-09-11 (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 MW2014-94 Link to ES Tech. Rep. Archives: MW2014-94

Conference Information
Committee AP MW  
Conference Date 2014-09-18 - 2014-09-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology, Ookayama Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave and Millimeter-wave, Metamaterials, Antennas and Propagation, Student Session 
Paper Information
Registration To MW 
Conference Code 2014-09-AP-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Miniaturized Broadband Lumped Element Circulator for Tunable Front-end system 
Sub Title (in English)  
Keyword(1) Admittance matrix  
Keyword(2) Lumped element microwave circuit  
Keyword(3) circulators  
Keyword(4) a weak magnetic field  
Keyword(5) ferrites  
Keyword(6) microwave devices  
1st Author's Name Reiji Nakajima  
1st Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
2nd Author's Name Yuki Nakaike  
2nd Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
3rd Author's Name Takaya Wada  
3rd Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
4th Author's Name Makoto Kawashima  
4th Author's Affiliation Murata Manufacturing Co., Ltd. (Murata Manufacturing)
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Speaker Author-1 
Date Time 2014-09-19 12:35:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2014-94 
Volume (vol) vol.114 
Number (no) no.219 
Page pp.49-53 
Date of Issue 2014-09-11 (MW) 

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