Efficiency measurement of connected arrays using the improved wheeler cap method
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Copyright © 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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We present a method for measuring antenna efficiencyof connected arrays. The method is amodified version of theimproved Wheeler cap (IWC) method where the antenna undertest (AUT) is electrically connected to two walls of the WheelerCap which simulates array connection. Theoretical analyses basedon plane wave and cylindrical wave problems and numericalsimulations using HFSS and FEKO are presented to establishaccuracy estimates for the method. Close attention will be madein comparing two data collection techniques: frequency sweepingversus wall shifting. Finally, we discuss an apparatus for efficiencymeasurement of a 1-D connected array and the measurementresults
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