Simulation and measurement of log-periodic antenna and double ridged guide horn antenna for optimised field uniformity

摘要

Three basic types of antennas have been designed and simulated for field calibration, i.e. field homogeneity or uniformity, and power efficiency. The objective is to develop the best antenna in terms of field uniformity and power efficiency. Experiments have been performed according to IEC 61000-4-3 for field calibration which analyzes the field uniformity and forward power transmitted by the antennas. A standard logarithmic-periodic antenna, a double logarithmic-periodic dipole antenna, and an extended double-ridged guide antenna have been used for this purpose. The measurement results are compared with 3D full-wave simulation results of those antennas. The first analysis is done with respect to the scattering (S)-parameter, the voltage standing wave ratio, and the gain of the antennas. Then the electric field strength at some distance is compared, and how much the E-field distribution is spread along the desired frequency band. Finally, with respect to the power, the field uniformity and distribution is also investigated.