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Omnidirectional Slots Antenna

Omnidirectional Slots Antenna

Junping Geng

Omnidirectional Slots Antenna

Junping Geng Department of Electrical Engineering Shanghai Jiao Tong University Shanghai, China

ISBN 978-981-15-9088-7 ISBN 978-981-15-9089-4 (eBook) https://doi.org/10.1007/978-981-15-9089-4 Jointly published with Shanghai Jiao Tong University Press The print edition is not for sale in China (Mainland). Customers from China (Mainland) please order the print book from: Shanghai Jiao Tong University Press. © Shanghai Jiao Tong University Press, Shanghai and Springer Nature Singapore Pte Ltd. 2021 This work is subject to copyright. All rights are solely and exclusively licensed by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publishers, the authors, and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publishers nor the authors or the editors give a warranty, express or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publishers remain neutral with regard to jurisdictional claims in published maps and institutional affiliations. This Springer imprint is published by the registered company Springer Nature Singapore Pte Ltd. The registered company address is: 152 Beach Road, #21-01/04 Gateway East, Singapore 189721, Singapore

Preface

The omnidirectional slots antenna has been studied for several years by our group. The whip antenna is an economic antenna for omnidirectional radiation on the base station or moving vehicles, but its length and gain contracted each other, and only just vertical polarization. In the real case, circular polarization omnidirectional antenna is very necessary to mobile communication in the earth, but it is difficult to realize to take place of the whip. According to our many years antenna experiences, combining characteristics of the whip antenna, slot antenna and running TEM wave in coaxial wire, we propose the orthogonal slots array on the coaxial wire to leak the TEM wave to radiate omnidirectional circular polarization wave around the coaxial wire. After first simulation, it confirms our idea that the left hand rotated electric field appeared around the coaxial wire with several round orthogonal slots array, and there is the CP omnidirectional pattern at some frequency point. In f