Emc Study Of Medium-wave Transmitting Antenna Based On MoM

Today, people remain listening to the radio as important part of daily life although the rapid development of internet. So, it is of great practical significance that study on the radio antennas, such as improving the efficiency of far-field radiation, and reducing the power of near-field radiation in order to protecting staff's health who works in the region of radio transmitting station. Now, EMC's research at home and abroad is focused on the high-voltage transmission line, micro-strip antenna and high-frequency printed circuit board, while is rarely seen on the AM broadcast band.This dissertation elucidates the advantages of EMC studying about medium-wave antenna by using MoM. A brief introduction to medium-wave antennas, knowledge of MoM and EMC, then elucidated how to model medium-wave antenna using MoM detailed.Modeling medium-wave antenna based on EFIE, Using two different methods when selecting basic function. The first model is using two forms of Hallen and Pocklington, basic function were selected using the entire-domain sine and the form of sub-domain piecewise pulse. The second model is using RWG edge element, basic function is actually infinitely small electric dipole. The surface current distribution of antenna is obtained, then according to the relevant electromagnetic theory, calculate characteristics of far-field radiation, near-field radiation. With HFSS simulation software, scale model of AM antenna was simulated. Comparison of the calculation of MoM, simulation results and actual test results at Lhasa mw transmitting station agree very well,and they are consistent with the theoretical analysis.Degree of coupling is an important parameter that measure of mutual interference, a new method adopting Friis formula is presented that computating degree of coupling between AM antennas...