The Evaluation of the Antenna Measurement Accuracy Using Ferrite Cores and Baluns for Small Antennas
Details
It has been reported that the leakage current along the external side of the outer conductor of a feeding cable connected to a wideband antenna causes antenna measurement errors and ferrite cores are often used to reduce those errors. However, the practical loading configuration of ferrite cores is usually determined by trial and error and the quantitative analysis on the loading condition of ferrite cores is important. This report assesses the effect on the leakage-current-reduction by using ferrite cores in terms of the radiation pattern and input impedance measurements. Also, the combination use of baluns and ferrite cores is evaluated quantitatively for the wideband antenna radiation efficiency measurement.
