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Paper Abstract and Keywords
Presentation 2007-09-06 11:10
Single-Layer Slotted Waveguide Array with Reflection Canceling Stairs
Yasuhiro Tsunemitsu, Goro Yoshida (JRC), Jiro Hirokawa, Makoto Ando (Tokyo Tech), Naohisa Goto (Radial Antenna Laboratory) AP2007-78
Abstract (in Japanese) (See Japanese page) 
(in English) Single-layer slotted waveguide arrays are developed for microwave and millimeter wave application. An alternating phase fed array, which is one type, consists of a slotted plate and a waveguide base joined by a screw and is easy to fabricate. A new feed structure for single-layer slot array which is called a center-feed has been developed. This type of antenna has two important design advantages: the array bandwidth is doubled and the direction of the boresight beam is frequency independent. On the other hand, the aperture efficiency is relatively low, about 57% in the calculation.
The first reason for low efficiency is that a unit element in the array, which consists of a slot with reflection canceling inductive wall, produces a transmission phase advance; so the slot spacing is large and the number of slots is relatively small. The second reason is that the slots are staggered about the center of the radiation waveguide broad wall with increasing offsets towards the waveguide end for compensating the decreasing energy. In the alternating phase-fed planar array, the slot offset create high side-lobes in phi=45 degree plane. To solve the latter problem, radiating waveguides were staggered so that the slot offset may be decreased in Asociated Prof.Kimura's research.
In this paper, we reports a new slotted waveguide array for solving the above two problems. A novel reflection-canceling unit consisting of a slot and a stair beneath on the broad wall of the waveguide is proposed. It brings about the transmission phase delay resulting in dense slot arrangement while the increase of slot coupling toward the waveguide end dispenses with the increasing slot offset. The improvement of the array characteristics is predicted.
Keyword (in Japanese) (See Japanese page) 
(in English) Waveguide / Slot array antenna / Single-layer / Reflection canceling stair / Fixed Wireless Access / efficiency / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 210, AP2007-78, pp. 25-30, Sept. 2007.
Paper # AP2007-78 
Date of Issue 2007-08-30 (AP) 
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 AP  
Conference Date 2007-09-06 - 2007-09-06 
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 2007-09-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Single-Layer Slotted Waveguide Array with Reflection Canceling Stairs 
Sub Title (in English)  
Keyword(1) Waveguide  
Keyword(2) Slot array antenna  
Keyword(3) Single-layer  
Keyword(4) Reflection canceling stair  
Keyword(5) Fixed Wireless Access  
Keyword(6) efficiency  
Keyword(7)  
Keyword(8)  
1st Author's Name Yasuhiro Tsunemitsu  
1st Author's Affiliation Japan Radio Co., Ltd. (JRC)
2nd Author's Name Goro Yoshida  
2nd Author's Affiliation Japan Radio Co., Ltd. (JRC)
3rd Author's Name Jiro Hirokawa  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
4th Author's Name Makoto Ando  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
5th Author's Name Naohisa Goto  
5th Author's Affiliation Radial Antenna Laboratory (Radial Antenna Laboratory)
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Speaker Author-1 
Date Time 2007-09-06 11:10:00 
Presentation Time 25 minutes 
Registration for AP 
Paper # AP2007-78 
Volume (vol) vol.107 
Number (no) no.210 
Page pp.25-30 
#Pages 6 
Date of Issue 2007-08-30 (AP) 

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