Accurate calculation research on scattering characteristics of gap

Abstract

Abstract. For more accurately studying electromagnetic scattering characteristics of slit, the paper proposed a new method of vector cancellation. Firstly, the feasibility of the method is verified by the experimental method, then, this method is used to study the law of the gap electromagnetic scattering with the change of gap width, as well as multi frequency characteristics with the change of incident frequency. Calculation results show that: In the range of about ±30°, the gap induced surface wave scattering increases with the increase of the gap width and increases with the increase of the incident frequency; In the range of grazing incidence -90°~-60° and 60°~90°, the scattering curve of gap gradually become flat with the increase of the incident electromagnetic wave frequency.