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In this paper, application of a modified Wheeler cap method for the radiation efficiency measurement of balanced electrically small antennas is presented. It is shown that the limitations on the cavity dimension can be overcome and thus measurement in a large cavity is possible. The cavity loss is investigated, and a modified radiation efficiency formula that includes the cavity loss is introduced. Moreover, a modification of the technique is proposed that involves the antenna working complex environment inside the Wheeler Cap and thus makes possible measurement of an antenna close to a hand or head phantom. The measurement procedures are described and the key features of the technique are discussed. The results of simulations and measurements by the proposed method are presented and compared.
Original languageEnglish
Title of host publicationProceedings of AMTA 2010
Publication date2010
StatePublished - 2010
Event32. Annual Meeting & Symposium of Antenna Measurement Techniques Association -


Conference32. Annual Meeting & Symposium of Antenna Measurement Techniques Association
Period01/01/2010 → …


  • Wheeler Cap Method, Radiation Efficiency Measurement, Balanced Antennas, Antenna-on-Body Measurements, Electrically Small Antennas
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ID: 5240014