NDLI: Effect of flush mounted turntables on site attenuation

Content Provider	IEEE Xplore Digital Library
Author	Friesen, D.R. Flores, V.
Copyright Year	1989
Description	Author affiliation: Electro-Mech. Co., Austin, TX, USA (Friesen, D.R.; Flores, V.)
Abstract	When performing various electromagnetic emissions tests, rotation of the equipment under test is often accomplished by the use of turntables. The increasing use of flush mounted metal turntables, instead of above-ground nonmetallic turntables, leads to the problem of how to characterize the interface between the metallic turntable and the ground plane. Several different approaches are used to address this problem: ignoring it, single-point grounding, capacitive coupling, and massively parallel grounding. Site attenuation measurements were made at an open-area test site that has a 12 m by 42 m ground screen and an 8 ft diameter aluminum turntable. The graphs shown include the cable loss (which is constant throughout this test) and thus do not represent true site attenuation, but the anomalies measured translate directly to site attenuation curves. Both horizontally and vertically swept site response measurements were made from 20 MHz to 1000 MHz using biconical and log-periodic broadband antennas. A best case was determined by covering the gap between the turntable and ground screen with copper foil tape. This became the reference with which all other measurements were compared. The impedance across the gap between the turntable and the ground plane was measured, using a vector impedance analyzer, to determine any correlation to site anomalies.<>
Starting Page	163
Ending Page	165
File Size	305860
Page Count	3
File Format	PDF
DOI	10.1109/NSEMC.1989.37172
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-05-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Testing Antenna measurements Grounding Attenuation measurement Broadband antennas Impedance Performance evaluation Aluminum Loss measurement Copper
Content Type	Text
Resource Type	Article

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Experimental comparison of the various validation method using broadband antenna for radiated emission test site

The letter-rack antenna - A wide-band flush-mounted antenna of log-periodic design

Extension of site attenuation for radiated emission test site evaluation above 1 GHz

Three-site study of variations introduced by standard site imperfections using the ANSI63.5-1988 standard site method for antenna calibration

Shorted patches mounted on high impedance ground planes

A Critique on Traceability in Site Validation Measurements

Estimate the measurement uncertainty of broadband antenna (30MHz to 1GHz) calibration system

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Broadband antenna measurement comparisons

Effect of flush mounted turntables on site attenuation

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