Abstract
The single-antenna gain calibration method was first proposed by Glimm et al. of Physikalisch-Technische Bundesanstalt in 1999. Their method requires the measurements of the reflection coefficient of an antenna under test (AUT) in free space and the reflection coefficient on a large metal plane using two different measurement setups. On the other hand, we proposed a new single-antenna gain calibration method that can measure these quantities using the same measurement setup. Our proposed method uses the average value of the reflection coefficients of the AUT for various distances from the large metal plane to the AUT. Furthermore, we established a measurement setup for our proposed single-antenna method for a double-ridged guide horn (DRGH) antenna in the frequency range from 1 to 6 GHz. To estimate the antenna gain, we applied the Friis transmission formula, which included the amplitude center distance of the antenna. By using our proposed method and the measurement setup, the expanded uncertainty ( $k = 2$ ) of the DRGH was estimated to be from 0.61 to 1.70 dB over a frequency range from 1 to 6 GHz.
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