Method for predicting electrical properties of deformed log-periodic antennae based on electromechanical coupling model

基于机电耦合模型的变形对数周期天线电性能预测方法

Abstract

本发明公开一种基于机电耦合模型的变形对数周期天线电性能预测方法,主要解决对数周期天线中机电分离的问题。其方法包括:基于对数周期天线的结构设计参数建立有限元模型,加载自重及随机风等环境载荷,并进行有限元分析,得到其结构位移场。利用该分析结果,得到对数周期天线中各振子单元的电流分布以及由于振子单元位置和偏转引起的相位差,根据叠加定理,计算天线远区电场方向图;得到天线电性能参数,实现对数周期天线的机电耦合分析。本发明可使对数周期天线结构设计人员提高天线设计与制造质量。
The invention discloses a method for predicting electrical properties of deformed log-periodic antennae based on an electromechanical coupling model, aiming to mainly solve the problem of electromechanical separation in the log-periodic antennae. The method comprises the following steps: building a finite element model based on the structural design parameters of the log-periodic antennae, loading dead load, random wind and other environmental loads and carrying out finite element analysis to obtain the structure displacement field of the log-periodic antennae; utilizing the analysis results to obtain current distribution of oscillator units in the log-periodic antennae and phase difference caused by the positions and deflection of the oscillator units and computing the far field patternsof the log-periodic antennae according to the superposition theorem; and obtaining the electrical property parameters of the log-periodic antennae to realize electromechanical coupling analysis of the log-periodic antennae. The method can help the log-periodic antenna structural design personnel improve the antenna design and manufacturing quality.

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