Bi Junjian

A new adaptive noise cancellation method of non-continuous communication signal submerged in multi-interference noise

In this paper, a new adaptive noise cancellation method applied on non-continuous communication signal submerged in multi-interference noise is presented. And the noise cancellation capability of traditional method using single adaptive filter is enhanced. This method could be applied to the designing and manufacturing of new adaptive filter used on non-continuous communication signal which is submerged in multi-interference noise such as fixed frequency noises, random noises and so on. Some simulation results show that this method presented in this paper has a strong capability of noise cancellation. So this research provides some technical guidance for improving the anti-noise performance of communication systems.

Analysis and Design of Conical Equiangular Spiral Antenna Using MPIE and QGA Technique

The mixed-potential integral equation is applied to a triangular patch surface model of the conical equiangular spiral antenna. The relationship between the input impedance characteristics and the geometrical parameters such as base radius, top radius, height, windings and angular-width of the arms are obtained. In order to obtain a wider band and stabler reflectance, when its geometrical parameters are restricted, the quantum genetic algorithm is applied and the geometrical parameters are optimized. A pint-sized of conical equiangular spiral antenna operating between 1GHz and 8.7GHz is obtained. It provides some theoretical guidance for the designing and miniaturization of this type of antenna.