NDLI: Analysis and design of a partitioned circular loop antenna for omni-directional radiation

Content Provider	IEEE Xplore Digital Library
Author	Hasse, R. Hunsicker, W. Naishadham, K. Elseherbeni, A.Z. Kajfez, D.
Copyright Year	2011
Description	Author affiliation: Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, 30332, USA (Hasse, R.; Hunsicker, W.; Naishadham, K.) \|\| Department of Electrical Engineering, The University of Mississippi, 38677, USA (Elseherbeni, A.Z.; Kajfez, D.)
Abstract	A novel printed antenna configured with circular loop geometry of approximately one wavelength perimeter is designed for operation at 5.8 GHz with near omni-directional radiation pattern. The loop is partitioned into multiple segments and loaded with capacitive elements at selected locations so as to decrease phase variations in the current flow and thereby increase the radiation efficiency. A total of five capacitors are used to achieve stable current flow, resulting in phase variations of < 12°. The performance of the loop antenna is first analyzed as a transmitter in free space using a method of moments (MoM) solver for thin-wire structures, and then validated using 3-D finite element method (FEM) and MoM solvers. The simulated radiation pattern for the thin-wire model in the plane of the loop is close to omni-directional with directive gain of 1.46 dBi. A printed circuit antenna model is then designed with alternating top- and bottom-layer conductors of annular geometry on a thin substrate, with regions of conductor overlap functioning as physical capacitors. Simulations of the printed antenna demonstrate omni-directional radiation in the azimuthal plane, with peak directive gain of 1.66 dBi, peak directivity of 1.69 dB, radiation efficiency of 0.98, and input impedance close to 50 Ω. Performance measurement data for a fabricated printed circular loop antenna (in process) will be shown during presentation for comparison and validation.
Starting Page	1379
Ending Page	1382
File Size	526405
Page Count	4
File Format	PDF
ISBN	9781424495627
ISSN	19471491
e-ISBN	9781424495634
DOI	10.1109/APS.2011.5996548
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-07-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antenna radiation patterns Wires Directive antennas Antenna accessories Capacitors Finite element methods phase variations Loop antenna partitioned omni-directional current
Content Type	Text
Resource Type	Article

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