The use of GTD method to evaluate the effect of finite metallic plane of OATS on NSA in UHF (300 ∼ 1000MHz) region

This paper reveals the feasibility of using the GTD method to evaluate the effect of a finite metallic plane of Open Area Test Site on NSA, which is used to measure the performance of an open area test site at frequencies below 1 GHz. The sites typically consist of large ground planes. In fact, an infinite metallic plane is impracticable. Nevertheless, it is worthwhile probing the deviation of NSA under the finite metallic plane condition due to a close tie between the metallic plane and the construction cost. As a result, it is required to analyze the length and width of a rectangle metallic plane that influence the NSA. We adopt the GTD method to analyze the NSA deviation by calculating the edge diffraction of the finite metallic plane. From the comparison of the numerical and measured results, the key factor affecting NSA is the width of rectangle metallic plane, which should be regarded as a priority to reduce the NSA deviation under the consideration of the finite test site.