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

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5 Author(s)
Capstick, M.H. ; Found. for Res. on Inf. Technol. in Soc. (ITIS), Zurich ; Jekkonen, J.O. ; Marvin, A.C. ; Flintoft, I.D.
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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 using method-of-moment boundary element simulations of the interaction between two dipole antennas in free space. Examples of the measurement of the helical antenna of a terrestrial trunked radio (TETRA) handheld radio and a small portable device with an electrically small antenna are presented. The significant advantage of the technique in the accurate measurement of electrically small antennas is confirmed.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:58 ,  Issue: 3 )