Title :
A Novel Indirect Method to Determine the Radiation Impedance of a Handheld Antenna Structure
Author :
Capstick, M.H. ; Jekkonen, J.O. ; Marvin, A.C. ; Flintoft, I.D. ; Dawson, L.
Author_Institution :
Found. for Res. on Inf. Technol. in Soc. (ITIS), Zurich
fDate :
3/1/2009 12:00:00 AM
Abstract :
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.
Keywords :
antenna radiation patterns; boundary-elements methods; dipole antennas; electric impedance measurement; helical antennas; method of moments; TETRA; dipole antenna; electrically small antenna; handheld antenna structure; handheld radio; helical antenna; impedance measurement; indirect measurement technique; method-of-moment boundary element simulation; radiation impedance; terrestrial trunked radio; Antenna measurements; Dipole antennas; Electric variables measurement; Helical antennas; Impedance measurement; Loaded antennas; Measurement techniques; Mutual coupling; Probes; Scattering parameters; Antenna measurements; antenna radiation impedance; impedance matching; indirect measurement; scattering parameters;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2008.2005263
