研究目的
To evaluate and compare the measurement uncertainty of the absorption cross section (ACS) calculated by the time-domain method in a reverberation chamber.
研究成果
The overall uncertainty of the time-domain ACS is 0.02 averaged over the frequency range of 1~3GHz by the measurements in eight different configurations of absorbers and antennas in the RC, which is lower than the literature results and shows good experimental stability.
研究不足
The experimental errors caused by paddle positions setup and proximity effect should be avoided. The smaller the number of paddle positions is and the closer the AUT is from any metal surface, the greater the relative errors are.
1：Experimental Design and Method Selection:
A time-domain method is adopted to calculate ACS in a reverberation chamber.
2：Sample Selection and Data Sources:
Measurements were performed in the National Institute of Metrology (NIM)’s RC with absorbers and antennas.
3：List of Experimental Equipment and Materials:
The transmitting antenna is a log periodic antenna (ZHINAN, ZN30603D) and the receiving antenna is a horn antenna (Dayang Microwave, OBH08180). The absorbers are supplied by Dongshin Microwave. A vector network analyzer (Rohde & Schwarz ZVA 24) is used.
4：0). The absorbers are supplied by Dongshin Microwave. A vector network analyzer (Rohde & Schwarz ZVA 24) is used. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: For every measurement, 22001 points of the S-parameter are sampled in the frequency ranging from
5：9 to 1 GHz. Data Analysis Methods:
The uncertainty of repeated measurements and the overall uncertainty are analyzed.
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