MEASUREMENT OF ELECTRICALLY SMALL ANTENNAS

摘要

Measuring and biasing electrically small antennas presents several challenges due to the small impedances and high mismatches of the antennas. When these antennas are fed, however, the mismatch results in currents on the feed cable. These currents radiate, and their effect can be seen in the radiation resistance and radiation pattern. This paper examines the effects of cable radiation on electrically small antennas - specifically center loaded dipoles. We observed cable radiation, and showed that the radiation could be suppressed by use of baluns and ferrites. However our most noteworthy result was that currents on the feed cable diminished without any intervention at the resonant point of the antennas.