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Paper Abstract and Keywords
Presentation 2007-12-13 14:25
Bandwidth Enhancement of a Low-Profile Microstrip Antenna Electromagnetically Coupled with a Folded Inverted L-shaped Probe
Kazuki Ikeda, Kenichi Kagoshima, Shigeki Obote (Ibaraki Univ.) AP2007-118
Abstract (in Japanese) (See Japanese page) 
(in English) It is known that a method of bandwidth enhancement for a microstrip antenna (MSA) electromagnetically coupled with an inverted-L shaped probe. Previously, we have confirmed that its antenna can widen the bandwidth whose height of the patch more than 0.06 wave length compared to a conventional MSA fed by a coaxial probe. However, a radiation resistance of the inverted-L shaped probe decreases and cannot widen the MSA in low profile geometry whose height of the patch less than 0.06 wave length.
In this paper, we proposed a folded inverted L-shaped probe (FILP) and an MSA electromagnetically coupled with FILP (FILP fed MSA). The geometry of the FILP is folded an inverted-L shaped probe toward a ground plane and its radiation resistance increases 2.7 times compared to the inverted-L shaped probe when they resonated, so it obtains necessary radiation resistance in low profile. And it shows the FILP to adjust the impedance easily that it clarifies the relationship between impedance characteristics and structural parameters. First, for the FILP fed MSA, it shows the relationship between impedance characteristics and structural parameters which is the same as the FILP. Second, it confirms that useful range, form 0.02 wave length to 0.07 wave length, to widen the bandwidth of the FILP fed MSA compared to inverted-L shaped probe fed MSA. For the radiation patterns, the co-polarization is the same as the conventional coaxial probe fed MSA and the cross-polarization level is reduced. The last, analysis results are verified by an experimental results of the FILP fed MSA using dielectric substrates.
Keyword (in Japanese) (See Japanese page) 
(in English) Microstrip antenna / Folded inverted L-shaped probe / Electroganetic coupling / Bandwidth enhancement / Low profile / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 377, AP2007-118, pp. 19-24, Dec. 2007.
Paper # AP2007-118 
Date of Issue 2007-12-06 (AP) 
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 AP  
Conference Date 2007-12-13 - 2007-12-13 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) etc. 
Paper Information
Registration To AP 
Conference Code 2007-12-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Bandwidth Enhancement of a Low-Profile Microstrip Antenna Electromagnetically Coupled with a Folded Inverted L-shaped Probe 
Sub Title (in English)  
Keyword(1) Microstrip antenna  
Keyword(2) Folded inverted L-shaped probe  
Keyword(3) Electroganetic coupling  
Keyword(4) Bandwidth enhancement  
Keyword(5) Low profile  
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Keyword(7)  
Keyword(8)  
1st Author's Name Kazuki Ikeda  
1st Author's Affiliation Ibaraki University (Ibaraki Univ.)
2nd Author's Name Kenichi Kagoshima  
2nd Author's Affiliation Ibaraki University (Ibaraki Univ.)
3rd Author's Name Shigeki Obote  
3rd Author's Affiliation Ibaraki University (Ibaraki Univ.)
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Speaker Author-1 
Date Time 2007-12-13 14:25:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2007-118 
Volume (vol) vol.107 
Number (no) no.377 
Page pp.19-24 
#Pages
Date of Issue 2007-12-06 (AP) 


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