辐射场中金属接触非线性源的无源互调仿真方法  

A simulation method of passive intermodulation for metallic contact in radiation field

作　　者：曹智 赵小龙[1] 周昊楠 张可越 陈雄 贺永宁[1] CAO Zhi;ZHAO Xiaolong;ZHOU Haonan;ZHANG Keyue;CHEN Xiong;HE Yongning(School of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen 518055,China;School of Electrical Engineering,The Chinese University of Hong Kong,Hong Kong 999077,China)

机构地区：[1]西安交通大学电子与信息工程学部,西安710049 [2]南方科技大学电子与电气工程系,深圳518055 [3]香港中文大学电子工程学系,中国香港999077

出　　处：《空间电子技术》2023年第6期30-35,共6页Space Electronic Technology

基　　金：国家自然科学基金项目(编号:62271240);国家重点实验室基金项目(编号:6142411122115)。

摘　　要：文章提出并验证了一种可以预测被天线接收的金属接触无源互调(passive intermodulation,PIM)幅值的仿真方法。把辐射场中的金属接触界面设置为非线性电流源离散端口,以该非线性电流源作为激励源通过CST场仿真能够获取天线接收端口的PIM响应。通过少量PIM测试结果可以仿真提取待测样(device under test,DUT)的非线性参数,进而仿真预测DUT在辐射场中任意位置的PIM响应。针对铝合金金属接触DUT,首先采用方同轴缝隙天线测试辐射场中某一位置的三阶PIM(third-order passive intermodulation,PIM3)幅值,其次基于场仿真提取了非线性电流源的三阶非线性参数,最后利用确定的非线性电流源仿真预测辐射中不同位置处的PIM3响应,仿真评估和实验测试结果一致。文章为辐射场复杂场景中金属接触PIM的评估及其非线性参数的提取提供了一种可靠且方便的途径。The paper proposes and verifies a simulation method that can predict the passive intermodulation(PIM)product for metallic contact received by an antenna.The metallic contact interface in the radiation field is set as a discrete port of a nonlinear current source,and the PIM response accepted by the receiving port of the antenna can be obtained by CST field simulation with the nonlinear current source as the excitation source.A small amount of PIM test results can be applied to simulate and extract the nonlinear parameters of the device under test(DUT),which enables us to simulate and predict the PIM level of DUT at any position in the radiation field.Firstly,we employ a slotted coaxial antenna to measure the third-order PIM(PIM3)amplitude for the DUT of aluminum metallic contact at a specific position in the radiation field.Then,based on the field simulation the third-order nonlinear coefficient of DUT can be extracted.Finally,by adopting the determined nonlinear current sources,we can simulate and predict the PIM3 levels at different positions in the radiation field.The simulation evaluation and experimental results are consistent.This research provides a reliable and convenient approach to evaluating the PIM response of metallic contact and extracting the DUT’s nonlinear parameter in complex radiation field scenarios.

关 键 词：无源互调 金属接触 辐射场 非线性电流源 非线性参数 

分 类 号：V443[航空宇航科学与技术—飞行器设计]