Analysis and Optimization of the Frequency Selectivity for the Short-wave Radio Station Receiver System

In this paper, the model of an existing superheterodyne receiver system with poor performance is built and solved in order to depict the frequency selectivity curve of the entire receiver system. In addition, the main intermodulation products which will bring strong power and fall into the actual receiving channels are theoretically predicted. Meanwhile, to effectively suppress the potential interference signal among each part, the method of optimizing the frequency selectivity of sub-components (such as filters) is presented. Finally it achieves to the whole system selectivity optimization and reinforces the electromagnetic compatibility. The simulation results fully demonstrated that this optimized system shows the great effect of electromagnetic compatibility reinforcement.