NDLI: Low Profile Vertically Polarized Omnidirectional Wideband Antenna With Capacitively Coupled Parasitic Elements

Content Provider	IEEE Xplore Digital Library
Author	Jungsuek Oh Sarabandi, K.
Copyright Year	1963
Abstract	This communication presents a low profile and electrically small wideband antenna with omnidirectional radiation pattern and vertical polarization. A novel design approach manipulating the topology of a low profile folded monopole antenna with capacitively coupled parasitic elements in the same plane is presented to achieve omnidirectional radiation pattern. The 10-dB return loss fractional bandwidth of 43% is achieved with the dimension of 0.2λ_LF ×0.2λ_LF ×0.06λ_LF where λ_LF is the wavelength at the lowest frequency of the operation. Unlike the convention wideband λ/4 monopole antennas utilizing inductively coupled parasitic elements, the λ/2 folded monopole antenna allows for positioning the capacitively coupled parasitic elements in the middle of the antenna where maximum electric stored energy is formed. This, together with reducing the lateral dimension of the folded monopole antenna, enables the cancellation of radiated fields from electric currents in the horizontal plane of the proposed antenna, which is essential to achieve vertically polarized omnidirectional radiation. The compact parasitic elements introduce additional resonances that significantly increase the antenna bandwidth. Effects of design parameters on two resonant frequencies and impedance matching to a 50 Ω feed are investigated using the equivalent circuit model of the parasitic element and full-wave electromagnetic (EM) simulations. Based on this analysis, a design procedure to optimize the antenna topology is established.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	977
Ending Page	982
Page Count	6
File Size	1381976
File Format	PDF
ISSN	0018926X
Volume Number	62
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antenna radiation patterns Broadband antennas Bandwidth Resonant frequency Integrated circuit modeling omni directional antennas electrically small antennas
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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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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