We have already proposed a single antenna method for an antenna factor estimation [1]. Our method makes it possible to measure separately the reflection wave at the ground plane and the intrinsic self-reflection wave of the antenna under test (AUT) using time-domain subtraction. However, our previous proposed method uses the fixed antenna distance. For this reason, main source of measurement uncertainty of far field antenna factor estimation is dependence of antenna distance. In order to decrease a measurement uncertainty, we propose a new estimation method for determining the antenna distance at each frequency that to estimate the far field antenna factor. Our proposed method is based on the techniques of a time domain analysis and a time-frequency analysis using a short time Fourier transform. This method
can determined the antenna distance at each frequency. In
this paper, we explain the single antenna method to estimate
a free space transmission wave of a log-periodic antenna
(LPDA), which is commercially available. Next, difference
between the estimated antenna factor and a far field antenna
factor using phase center modified Friis transformation is
explained.
We have already proposed a single antenna method for an antenna factor estimation [1]. Our method makes it possible to measure separately the reflection wave at the ground plane and the intrinsic self-reflection wave of the antenna under test (AUT) using time-domain subtraction. However, our previous proposed method uses the fixed antenna distance. For this reason, main source of measurement uncertainty of far field antenna factor estimation is dependence of antenna distance. In order to decrease a measurement uncertainty, we propose a new estimation method for determining the antenna distance at each frequency that to estimate the far field antenna factor. Our proposed method is based on the techniques of a time domain analysis and a time-frequency analysis using a short time Fourier transform. This methodcan determined the antenna distance at each frequency. Inthis paper, we explain the single antenna method to estimatea free space transmission wave of a log-periodic antenna(LPDA), which is commercially available. Next, differencebetween the estimated antenna factor and a far field antennafactor using phase center modified Friis transformation isexplained.
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