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Range distance requirements for large antenna measurements

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2 Author(s)
Uno, T. ; Dept. of Electr. Eng., Tohoku Univ., Sendai, Japan ; Adachi, S.

The dependence of the radiation patterns and antenna gains on the measurement distance when both transmitting antenna and receiving antenna have the same order of large dimensions is discussed. The antenna under test is the transmitting antenna. The near-zone radiation patterns (Fresnel pattern) and the antenna gains of various kinds of circular aperture distributions vs the measurement distances are calculated for an arbitrary size of the receiving probe antenna. It is found both theoretically and experimentally that the near-zone measurement error of the radiation patterns introduced when the receiving antenna is of comparable or the same dimension as the transmitting antenna is smaller than the error introduced when the receiving antenna is very small. Thus, it is concluded that as a range criterion 2D2a/λ is more appropriate than 2(Da+Db)2 /λ for pattern measurements (Da and Db are linear dimensions of the transmitting and receiving antennas, and DaDb is assumed). It is shown that the gain error for any aperture distribution obtained by using a large receiving probe antenna is greater at any range distance than the error obtained by using a small antenna such as a dipole

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:37 ,  Issue: 6 )

Date of Publication:

Jun 1989

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