University of Twente Student Theses
Characterization of vibrating intrinsic reverberation chamber and comparison with classical reverberation chamber for antenna efficiency measurements
Alizada, R. (2018) Characterization of vibrating intrinsic reverberation chamber and comparison with classical reverberation chamber for antenna efficiency measurements.
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| Abstract: | The primary focus of this thesis is to evaluate the use of the vibrating intrinsic reverberation chamber (VIRC) as a lightweight and fast alternative to antenna efficiency measurements. The VIRC is a transportable reverberation chamber with varying angles between wall, floor, and ceiling, where wave diffusion is achieved by the vibration of the flexible walls. For the purpose of showing whether the VIRC may have an impact on the implementation of antenna efficiency measurements, we have carried out a comparison of measurements of two wideband antennas, namely, vertically polarized, discone antenna and a double ridge guide (DRG) horn antenna. Measurements were performed in a classical RC (1.5 m x 1.3 m x 1 m) and a VIRC (1.5 m x 1.2 m x 1 m) at the University of Twente, Enschede, the Netherlands. The antenna efficiency is measured using two subcategories of the non-reference antenna measurement method, namely, the one-antenna and the two-antenna methods. It is observed that the effect of non-ideal field uniformity in both RCs, as defined by the enhanced backscatter coefficients being different from $2$, is eliminated by the two-antenna method. In spite of the two chambers differing in dimensions and stirring mechanisms, the antenna efficiency measured using the two-antenna method is similar in both the classical RC and the VIRC. VIRC has very close agreement between the results calculated by using both one- and two-antenna methods for frequencies above 700 MHz (with combined relative uncertainty of 0.12 for AUT1 and 0.08 for AUT2) but Classical RC's one-antenna and two antenna methods provide relatively larger difference in the efficiencies (<5% for AUT2 and 12% for AUT1). These results demonstrate the feasibility of implementing non-reference antenna efficiency measurements in VIRC and its use as an alternative tool for antenna efficiency measurements. The presented results add to the wealth of other results aiming at the VIRC, and RC in general, becoming a fully standardized and accepted facility within the wireless and EMC measurement industries. |
| Item Type: | Essay (Master) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology |
| Programme: | Electrical Engineering MSc (60353) |
| Link to this item: | https://purl.utwente.nl/essays/76949 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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