Mutual coupling compensation analysis method for microstrip array antenna

Abstract

The invention discloses a mutual coupling compensation analysis method for a microstrip array antenna. The method comprises the following steps of: modeling an array antenna structure, and performing delaunay triangulation on the structure by using the delaunay of a MATLAB function to divide the surface of a metal to be researched into a series of triangles, wherein each pair of triangles with common sides forms corresponding Rao-Wilton-Glisson (RWG) side elements; and replacing the surface current distribution of the RWG side elements of two triangles by using an infinitesimal dipole with an equivalent dipole moment or strength by adopting a dipole modeling method, and determining the electromagnetic radiation characteristics of a free space for surface current. A mutual impedance array, solved by adopting a moment method, of the microstrip array antenna takes the effect of mutual coupling between adjacent radiation elements into account. Therefore, a mutual coupling weight vector of an array unit is corrected during weight vector calculation mutual coupling effect correction to further optimize the output direction characteristics of an array.

Description

[0001] The surface current distribution of the array element is an important parameter for analyzing the array antenna, which determines the array radiation and scattering characteristics. There are many methods to analyze this characteristic, among which the method of moments is the most typical one. The most commonly used basis function in the method of moments is the impulse basis function, which is matched with point matching, which requires more sampling points, which increases the amount of calculation, and it cannot effectively represent some vector functions. [0002] The RWG (Rao-Wilton-Glisson) edge element method divides the antenna surface into many triangular small units. The triangular patch can satisfy the solution of any shape or boundary conductor. The changing conductor surface current density can be obtained in the small triangular patch Expressed conveniently and intuitively. The scope of RWG edge elements is a triangular area, which is easier to conform to ...

AI Technical Summary

Problems solved by technology

The mutual coupling effect of the antenna directly affects the change of the electrical parameters of the antenna performance. For example, if the current distribution changes, the input impedance and gain will also change, causing the radiation pattern to be distorted, the main beam direction to shift, and the side lobe to rise. SNR drop

In short, the existence of the mutual coupling effect of the antenna makes the antenna not reach the best design effect

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