A Novel Indirect Method to Determine the Radiation Impedance of a Handheld Antenna Structure

Myles H. Capstick, Jari O. Jekkonen, Andrew C. Marvin, Ian D. Flintoft, and Linda Dawson, in IEEE Transactions on Instrumentation and Measurement, Volume 58, Issue 3, pp. 578–585, March 2009

A novel indirect measurement technique is developed in which the input impedance of an unknown antenna structure is determined by measuring the change in the measured input impedance of a second probe antenna, while the unknown antenna is loaded at its input by a set of known impedances. The feasibility of the approach is explored, examples are presented, and the significant advantage of thenew technique in the accurate measurement of electrically small antennas is confirmed.

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