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A modified radiometric method for measuring antenna radiation efficiency

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3 Author(s)
McEwan, N.J. ; Dept. of Electron. & Telecommun., Bradford Univ., UK ; Abd-Alhameed, R.A. ; Abidin, M.N.Z.

Radiation efficiency of antennas is shown to be measurable by a modified radiometric technique where the antenna's physical temperature is varied, rather than the noise temperature of its surroundings. The method is accurate, flexible and much more convenient for routine use. A means of avoiding errors caused by temperature-dependent antenna impedance is described. The accuracy of the method is verified by measuring the radiation efficiency of a horn antenna with a 3 dB attenuator to simulate a 50% efficient antenna, and by using microstrip patch antennas, whose measured efficiencies compared well with values computed from a transmission-line model.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:51 ,  Issue: 8 )

Date of Publication:

Aug. 2003

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