Title :
Evaluation and Improvement of the Accuracy of TEM Transmission Cells with Internal Field Measurements
Author :
Jokela, K. ; Puranen, L.
Author_Institution :
Institute of Radiation Protection, P O Box 268, SF-00101 HELSINKI 10, FINLAND
Abstract :
Two square TEM transmission cells with side heights 30 cm and 50 cm were designed for the calibration of RF-hazard monitors. The error due to reflections was reduced from ±10 % to ±2 % (input VSWR < 1.2) by lengthening straight sections and measuring the longitudinal E-field patterns at calibration frequencies. Comparison measurements with small probes showed that the maximum difference between the cells was 7 % except some sharp resonance points caused by TEM harmonics and TE01 mode. The vertical field non-uniformity was also examined.
Keywords :
Antenna measurements; Calibration; Electrical resistance measurement; Frequency response; Magnetic field measurement; Magnetic resonance; Probes; Reflection; Spectral analysis; TEM cells;
Conference_Titel :
Microwave Conference, 1983. 13th European
Conference_Location :
Nurnberg, Germany
DOI :
10.1109/EUMA.1983.333312
