NDLI: An improved method for determining normalized site attenuation using log periodic dipole arrays

Content Provider	IEEE Xplore Digital Library
Author	Zhong Chen Foegelle, M.
Copyright Year	2000
Description	Author affiliation: EMC Test Syst., Austin, TX, USA (Zhong Chen)
Abstract	A normalized site attenuation (NSA) measurement, made using LPDA free-space antenna factors (AF) as specified in ANSI C63.4, has up to 3 dB of systematic errors due to limitations in the current theory. The ANSI model fails to account for the log periodic antenna's radiation pattern and its active phase center position, which were shown to be the dominant effects causing these errors. An enhanced theoretical model is introduced in this paper to take these two effects into account. In the enhanced model, antenna radiation patterns and active phase center positions are assumed to be unknown. At each frequency, the unknowns are solved by fitting the theoretical magnitude or phase response to a measured antenna response taken at different heights. The complex fit NSA (CFNSA) is then obtained by including the varied phase center and radiation pattern of the antennas under test. It is shown that the CFNSA model reduces the systematic errors in the current NSA to less than a dB.
Starting Page	511
Ending Page	516
File Size	558327
Page Count	6
File Format	PDF
ISBN	0780356772
DOI	10.1109/ISEMC.2000.874673
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-08-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Log periodic antennas Dipole antennas Antenna measurements Antenna radiation patterns Phase measurement Attenuation measurement Receiving antennas Current measurement Antenna theory Frequency
Content Type	Text
Resource Type	Article

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