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On the Error Analysis and Correction Techniques of Planar NearField Scanning for UltraLow Sidelobe Antenna Measurements
Author: ZhangFuShun
Tutor: LiuQiZhong；MaoNaiHong
School: Xi'an University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: UltraLowSideLobe Antennas Planar NearFiled Measurement Amplitude and Phase Errors Finite Scanning Truncation Errors Scanning Position Errors Instrumentation Errors Random errors Multiplereflection Errors Measurement Environment Errors.
CLC: TN820
Type: PhD thesis
Year: 1999
Downloads: 423
Quote: 11
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Abstract
ABSTRACTttis dissertaion deals with the ermr analysis and correchon techniques of planarnear field scanning for ultralowsidelobe antennas measurementS. First, the errors causedby the various ermrsources are equivaleflt to the amplitude and phase errors of the datameasured in the near field plane. For simplicity the amplitude and phase distribution ofantenna under test (AUT) on the grids in the nearfield sctring plane is equivalent to thedistriblltion on an antenna array The expressions of sidelobe measurement errors versusthe relative parameters of AUT are presented when ultralowsidelobe antermas are testedby the planar nearfield measurements. The erroruPperbotmds expressions of antermaspallem ermrs resultCd frOm the finite scanning truncation errors, position errors,instoentation errors, multiplereflection errors and measurement environrnent errors innear filed measurement are derived respectively. Then, the effect of some main errorsources in near field measurement on the sidelobe of ultralowsidelobe antennas patternare simulated by computer simulation method. Finally the effective methods fOr thoseerror sources to be reduced are made with computer simulation and the "self correction"method for the errors produced by multiplereflection and environment to be reduced areproved with the experiment. The dissertation is divided into 6 chapters. The main contcntsof these chapters are as follows:ChaPter l is Preface. The principles of planar near field measurement are introduced inthis chaPter. The aristates and history of the near field measurement tecImiques arereviewed systematically. The measurement of ultralowsidelobe antennas by the planarnear field technique is outlined and the significance of this research prOject is surveyed.The studied works and the diagrarns of this dissertation are also given.ChaPter 2 is The Basic Theory The relative mathematical formulations used in thedissertation are listed, which include the relative mathematical theory in advancemathematics, engineering mathematics, probability and statistics, error theoryelectromagnetic theory and the theory of near field anenna measurement.ChaPter 3 is The Main ErrorUpperBounds Analysis of Near Field MeasurementTecdriques for UltraLowSidelobe Anennas Measurements. There are 8 Sections in thischaPer. The expression of the sidelobe measurement errors versus the relative parametersof AUT is analyzed when the ultralowsidelobe amennas are tested by the planarnearfield measuremellts. The ermruPperbouhds evaluaion expressions of the amermas pattemerrors, caused by the trite scanning trUllcation errors, POsihon ermrs, inientationvlIerrors, multiplereflection errors and measurement environment errors in the near filed measurement, are derived respectively, and these expressions are explained and discussed.Chapter 4 is Main Errors Simulation for the UltraLowSideLobe Antennas Tested by Near Field Measurement Techniques. First, the mathematical expressions are deduced for simulation processes. Then, the effect of the total AUT amplitude and phase errors m the nearfield scanning plane, the finite scanning truncation errors, position errors, instrumentation errors, multiplereflection errors and the measurement environment errors on the sidelobe of the ultralowsidelobe antenna patterns are qualitatively analyzed by computer simulation method.Chapter 5 is The Computer Simulations Method for the Main Errors Correction of the UltraLowSideLobe Antenna Tested by NearField Measurements. The simulation of the errors correction methods are made for the errors resulted from the AUT amplitude and phase measured errors on the scanning plane, the finite scanning truncation errors, position errors, and instrumentation random errors in the near field on the mathematical models given in Chapter 4 and the simulation results of the errors correction methods are given.Chapter 6 is Method for the Multiplereflection Errors an

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > General issues
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