The accurate measurement of radiation patterns of electrically small antennas (ESAs) requires a reflectionless environment and minimal disturbance from the antenna support and feed cable.

These influence factors constitute the ‘antenna-to-range interface’ and hence the deviation of the antenna performance from an ideal non-invasive set-up.

To eliminate the large distortion associated with the unwanted radiation from a coaxial cable an electro-optical (EO) transducer was employed. Numerical results for the radiation pattern of a dielectric resonator ESA operating at 2.45 GHz are compared with the measured results using an EO transducer or a cable.

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