基于正态分布宽带信号的无源互调特征行为分析  

Characteristic behavior analysis of passive intermodulation based on normal distribution wideband signal

作　　者：刘瑞哲 金秋延 陈雄 LIU Ruizhe;JIN Qiuyan;CHEN Xiong(School of Information Science and Technology,Southwest Jiaotong University,Chengdu Sichuan 610000,China;Department of Electronic and Electrical Engineering,Southern University of Science and Technology,Shenzhen Guangdong 518055,China;Department of Electronic Engineering,Chinese University of Hong Kong,Shatin Hong Kong 999077,China)

机构地区：[1]西南交通大学信息科学与技术学院,四川成都610000 [2]南方科技大学电子与电气工程系,广东深圳518055 [3]香港中文大学电子工程系,中国香港沙田999077

出　　处：《太赫兹科学与电子信息学报》2023年第7期882-890,共9页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(62101461,U22A2016);安徽大学信息材料与智能感知安徽省实验室开放基金资助项目(IMIS202111)。

摘　　要：在现代无线通信中,无源互调是影响通信信号传输质量的重要因素。双音互调测试能够有效衡量无源器件的非线性特性,却无法准确预测出器件在宽带信号激励下的非线性失真。因此本文提出了一种基于正态分布的宽带信号激励下的射频连接器无源互调特性分析方法。通过双音互调测试,建立射频连接器无源非线性传输数学模型,并将基于正态分布的等效宽带信号作为非线性传输模型的激励源进行模拟仿真。结果表明,宽带无源互调功率分布与宽带信号功率分布相同,n阶宽带无源互调带宽为原宽带信号带宽的n倍,宽带信号的无源互调产物相较于双音测试信号有所增强,且信号的信噪比下降,说明宽带信号在传输过程中受到的干扰更加严重。电路仿真和数值计算呈现出良好的一致性,证明了本分析方法的有效性。In modern wireless communication,passive intermodulation is an important factor affecting the transmission quality of communication signals.Dual-tone intermodulation testing can effectively measure the nonlinear characteristics of passive devices,but it is hard to accurately predict the nonlinear distortion of devices excited by broadband signals.A method for analyzing the Passive Intermodulation characteristics of RF connectors with broadband signal excitation is proposed.Through the dual-tone intermodulation test,the passive nonlinear transmission mathematical models of RF connectors are derived.An equivalent broadband signal considering normal distribution is provided as the excitation source to the connectors.Mathematical calculation results of the proposed model show that the broadband Passive Intermodulation power distribution is the same as the broadband signal power distribution.The bandwidth of the nth-order broadband Passive Intermodulation is n times that of the original broadband signal.It is observed that the power of Passive Intermodulation products with broadband signal excitation are higher than that of the dual-tone signal.Thus,the signal to noise ratio decreases,indicating that the PIM interference induced by the broadband signal in the transmission process is more serious compared with that induced by two Continue Wave(CW)signals.Simulations are conducted by importing the proposed broadband signal and nonlinear transfer function to an equivalent circuit.The simulation results show good consistency to the theoretical calculation,which proves the effectiveness of this analysis method.

关 键 词：同轴连接器 宽带信号 无源互调 非线性器件 

分 类 号：TN972[电子电信—信号与信息处理]