Simple antenna characterisation using multiple VNAs: Page 6 of 7

May 25, 2017 // By Ing. C. Culotta-Lopez, Dipl.-Ing. T. Dallmann, IHF RWTH, Aachen, Germany and Dipl.-Ing. F. Gerhardes, Anritsu, Germany
This article shows how a set of two single-port vector network analysers (VNAs) that can be remotely operated via a LAN interface can be used for low-cost scalar transmission measurements for simple antenna characterisation. Practical results are included to show how antenna pattern and antenna gain measurements can be carried out with a very limited investment.

Measurement results

Typical gain results are shown in Tables 1 and 2, while the radiation patterns in Figures 2 and 3 are normalised to the maximum value in bore sight direction and smoothed with an average moving filter with a span of 3.

Table 1: Qualitative difference between the applied gain calculation methods for USLP 9143.

Table 2: Qualitative difference for SAS-571 between specified and calculated gain.

Figure 2: Relative gain of antenna under test (USLP 9143).

Figure 3: Antenna radiation pattern results.

Comparing the results with USLP 9143 supplier specification shows that the form and shape are matching, but the results are more fringed than and not as smooth as those given by the supplier. This is due to reflections resulting from the non-ideal environment (distance to earth, lighting masts close to the measurement area, buildings etc.).

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