NDLI: Miniaturization of a circularly-polarized, uni-directional, ultra-wideband spiral antenna

Content Provider	IEEE Xplore Digital Library
Author	Ting-Yen Shih Behdad, N.
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Wisconsin-Madison, Madison, WI, USA (Ting-Yen Shih; Behdad, N.)
Abstract	A low-profile, miniaturized ground-plane backed spiral antenna with a wideband circularly-polarized response is presented. This antenna is a multilayer structure composed of a center-fed modified Archimedean spiral antenna that includes a novel loading structure, a ring shaped absorber, and a feeding network. The loading structure possesses both inductive and capacitive characteristics, which increase the equivalent electrical length of the antenna while maintaining its maximum dimensions. Using this structure, the volume occupied by a conventional uni-directional Archimedean spiral antenna is miniaturized by a factor of 78%. This antenna is integrated into the multilayer structure along with its differential feeding network. An optimized ring-shape absorber is used to reduce the ground effects on the antenna performance. The measured peak realized gain of the antenna with the feeding network is 2.62 dBiC. The measured 3-dB axial ratio (CP) bandwidth is 2.5:1. The size of the antenna with the feeding network is $0.24λ_{min}$ × $0.24λ_{min}$ × $0.10λ_{min},$ where $λ_{min}$ is the wavelength at the lowest frequency of operation. The design process, simulation, and the measurement results of the antenna are presented and discussed.
Sponsorship	IEEE Antennas & Propag. Soc.
Starting Page	285
Ending Page	286
File Size	143013
Page Count	2
File Format	PDF
ISBN	9781479935383
ISSN	15223965
e-ISBN	9781479935406
DOI	10.1109/APS.2014.6904474
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-07-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spirals Antenna measurements Ultra wideband antennas Loaded antennas Gain measurement Loading
Content Type	Text
Resource Type	Article

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