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Characterisation of a Fibre-Optic Active Probe for Compensation of the Test-Zone Field

: Gemmer, T.M.; Mann, W.; Heberling, D.


European Association on Antennas and Propagation -EurAAP-; Institute of Electrical and Electronics Engineers -IEEE-:
14th European Conference on Antennas and Propagation, EuCAP 2020 : 15 - 20 March 2020, Copenhagen, Denmark, online
Piscataway, NJ: IEEE, 2020
ISBN: 978-1-7281-3712-4
ISBN: 978-88-31299-00-8
5 S.
European Conference on Antennas and Propagation (EuCAP) <14, 2020, Online>
Fraunhofer FHR ()

Compensation of the non-ideal Test Zone Field (TZF) in which an antenna under test is characterised requires a precise determination of the incident electric field. In order to perform spherical measurements of the test zone, a probe is, thus, inevitable which interacts with the TZF as slightly as possible. Therefore, a fibre-optic probe is used which primarily consists of dielectric parts. To correct for the measuring test-zone probe, a thorough determination of its radiation pattern and polarisation ratio is mandatory. To this end, full-wave simulations are carried out on the probe model and compared to spherical near-field measurements, thereby ensuring an accurate probe characterisation. Subsequently, the probe is included to simulated TZF data via spherical wave expansion in order to demonstrate the suitability of this fibre-optic probe for measuring the incident field and the importance of test-zone probe correction.