Rapid Prediction Method of Microwave Antenna Pattern under the Obscuration of Near-field Complex Objects

Abstract

The invention provides a method for quickly predicting a directional diagram of a microwave antenna under the occlusion of a near-field complex barrier. The method specifically comprises the following steps: 1) approximating near-field properties of the microwave antenna based on expansion of a spherical surface wave source: by taking an origin of coordinates as a center of circle, making a smallest sphere surrounding a to-be-predicted antenna, wherein an antenna field represents weighted sum of vector wave functions in a space outside the sphere, and an electric field intensity vector and a magnetic field intensity vector are used for expression, so that a radiation near field of a reflector antenna is approximated as the expansion of the spherical surface wave source; 2) constructing a simulation scene by the expanded spherical surface wave source and a complex barrier model, wherein the complex barrier model has coexistence complexity of a dielectric material and a metal material; and 3) performing simulation calculation on the simulation scene constructed in the step 2) with a geometric optical method to obtain a directional diagram curve. According to the method, the problem of near-field occlusion can be solved, the material range is relatively wide and the electric dimension is relatively high in problem solving, the calculation speed is remarkably higher than that in a conventional method, and a prediction result is relatively matched with a test result.

Description

technical field [0001] The invention belongs to the field of electromagnetic compatibility of ships, and in particular relates to a method for quickly predicting the pattern of a microwave antenna under the shadow of complex objects in the near field. Background technique [0002] Usually, when analyzing the radiation characteristics of microwave antennas, the free space environment is considered. There are relatively few methods to consider the influence of the actual background environment, and once complex obstacles (such as complex structures, materials, and large size spans) appear in the near-field area of ​​the antenna in the actual background, it will significantly increase the difficulty of predicting the antenna radiation capability. Traditional integral equation methods are difficult to achieve fast and effective prediction on ordinary workstations. Typical high-frequency methods such as physical optics are not easy to deal with dielectric materials, and methods s...

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Problems solved by technology

[0003] The problem to be solved by the present invention is to provide a microwave antenna pattern under the shadow of complex obstacles in the near field in order to realize the rapid prediction of the microwave antenna pattern under the shadow of complex obstacles in the near field on the ordinary workstation. Fast Prediction Method

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