Real free space antenna factors for validating completely absorber lined chambers?

Validation of completely absorber lined chambers with an optically driven antenna and free space antenna factors

“…[5]. Actually this antenna was not developed for wide-band SA-measurements, it was tuned at a frequency of 900 Based upon the results as presented in [2] we can even more firmly support the idea that 'there is only one reference which is Free Space, where the wave impedance Z, is traceable' [6]. The test set-up for the measurements has not been changed and is given in Figure 2.…”

“…The result is given in Figure 8. We again [2] have to emphasize our concern about two aspects of the prescribed procedure:…”

“…Validating a CALC with antennas calibrated on an OATS causes problems. Most of these problems have been solved in the meantime, an essential step has been to use the AF,, [2]. Practically this means that the well known equations used for the OATS have to be derived again for the CALC [2].…”

“…Most of these problems have been solved in the meantime, an essential step has been to use the AF,, [2]. Practically this means that the well known equations used for the OATS have to be derived again for the CALC [2]. Actually these problems incorporate also the influence of the large metal groundplane on the antenna factor.…”