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The authors propose a novel method for measuring the Total Radiated Power (TRP) of small radio terminals, such as mobile phones, active RFID tags, and UWB devices, using a spheroidal cavity coupler in which an Equipment Under Test (EUT) and a receiving antenna are displaced symmetrically around the focal points of the spheroid. The proposed method provides a compact, low-cost TRP measurement system with high sensitivity and high speed. Although the behavior of electromagnetic waves in the coupler is complex due to multiple reflections, they can evaluate the maximum TRP from the EUT by using the displacement technique and calibration method.
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