NDLI: Electrically small antennas design challenges

Content Provider	IEEE Xplore Digital Library
Author	Abdallah, M.N. Dyab, W. Sarkar, T.K. Salazar-Palma, M.
Copyright Year	2015
Description	Author affiliation: Dept. of Signal Theor. & Commun., Univ. Carlos III de Madrid, Leganés, Spain (Salazar-Palma, M.) \|\| Dept. of Electr. Eng. & Comput. Sci., Syracuse Univ., New York, NY, USA (Abdallah, M.N.; Dyab, W.; Sarkar, T.K.)
Abstract	The Electrically Small Antennas (ESAs) perform well compared to larger antennas under matched conditions. In this paper, we study the difficulties in achieving a good design of an ESA matched to 50 O system. These difficulties are summarized in three topics: First, the Quality (Q) factor of an ESA, in general, is high and cannot be less than the Chu limit. The Q factor of an antenna is inversely proportional to the bandwidth of the antenna so this will impose a limit on the bandwidth of the antenna. Second, losses are always there in the impedance matching network, these losses associated with the matching network can dominate the small radiation resistance of an ESA which will degrade the efficiency of the ESA. Third, we are limited by the Fano-Bode gain-bandwidth limit when using the lossless passive matching network techniques. To overcome these issues, several solutions are presented briefly, either we try to alter the shape of the ESA so as to make the Q factor of the antenna close to the optimum lower limit or to use the concept of non-Foster matching networks to overcome the Fano-Bode limit. Finally, we design a four-arm meander line folded monopole which is considered an ESA at 1 GHz; it is shown that this design is matched to 50 Ω with low quality factor.
Sponsorship	IEEE
Starting Page	768
Ending Page	769
File Size	361131
Page Count	2
File Format	PDF
e-ISBN	9781479978151
DOI	10.1109/APS.2015.7304771
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Q-factor Bandwidth Dipole antennas Resistance Capacitors Inductors
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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