A method for generating a standard magnetic field in a circular waveguide

In order to minimize the effect of electromagnetic interference and the surrounding conductive materials in the calibration of small loop antennas used above HF frequencies, a novel method for generating a standard magnetic field in a circular waveguide is proposed. A method for obtaining the average magnetic-field strength incident on a receiving loop by placing the radiating and receiving circular loop antennas within a circular waveguide operated below the cutoff frequency region is described. The differences between the theoretical and experimental values of the field strength are within 0.1 dB between 10 and 150 MHz for the radiating and receiving loops with radii of 1.0 cm and within 0.15 dB between 10 and 110 MHz for radiating and receiving loops with a radii of 1.5 cm.<
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