Practical accuracy of directivity, efficiency and gain from the spherical near field

Measurement error in an anechoic chamber causes uncertainty in measured antenna parameters and various calibration techniques are used to minimize these. For the user, there is usually confusion as to what is being measured and presented, when using a commercial system. Here we compare the results from two methods of calibration used in the Satimo-SG64 chamber, a widely-used instrument for both research and certification. In particular, we discuss the differences in the calibration approaches and the results of the gain, efficiency and directivity for a low-gain standard antenna.