Design Of Electromagnetic Probe In Plasma

Due to the violent collision with atmospheric molecules on the surface of the aircraft during the reentry of a high-speed aircraft,the kinetic energy of the aircraft is continuously converted into heat energy.During the process of energy conversion,gas molecules are ionized and enveloped on the surface of the hypersonic vehicle to form a plasma sheath with shielding effect.The high-speed aircraft communication and communication,as well as flight control,form a very serious signal interference and even communication interruptions,the so-called "blackout phenomenon." In order to obtain the propagation process of electromagnetic waves in high-speed target plasmas,a correct understanding of the interaction mechanism between electromagnetic waves and plasmas and a deeper understanding of the interaction between plasma and electromagnetic waves—the scattering and transmission characteristics of plasmas to electromagnetic waves and electromagnetic waves in plasmas.The process of propagation evolution requires high-accuracy and hightemporal resolution measurements of changes in the electrical and magnetic fields during the evolution of plasma electromagnetic waves.In this paper,the near-field electromagnetic probes are deeply studied by using high-sensitivity and high-resolution plasma electromagnetic field measurement probes as the design goal.Due to the limitations of the traditional coaxial measurement probe design,the measurement probe's sensitivity and resolution can not be balanced well,so it can not provide very accurate measurement results.1.This article introduces and discusses the theoretical analysis model of the electromagnetic field probe system,and simulates the modeling probe measurement system in the CST,and studies the effect of different structural parameters of the coaxial electromagnetic probe model on the measurement field disturbance,probe sensitivity,and resolution performance.A flexible,high-sensitivity and high-resolution coplanar-wave conducting magnetic field measuring probe(20x10x1mm)has been designed.Unlike the traditional coaxial probe,this coplanar waveguide CPW(Coplanar Waveguide)electromagnetic field measuring probe will provide impedance.The matching link moves inside the probe structure and studies the influence of coplanar waveguide probe impedance matching on the measurement results of the CPW probe;at the same time,since the symmetrical structure of the CPW probe effectively suppresses the induced current generated by the probe itself,it can Effectively improve the measurement accuracy of the probe.2.In order to suppress the disturbance of the surface current due to the radiating structure of the probe to the measurement field,based on the idea of the coaxial probe suppressing the surface current,add a short circuit feeder to both sides of the CPW probe structure designed in this paper.The planar air bridge reduces the disturbance to the measurement field by changing the radiating structure of the probe.The simulation verifies that the flexible design of the CPW electromagnetic field antenna effectively balances the relationship between sensitivity and resolution.Through the theoretical simulation research on the structural parameters of the measuring probe,this paper designs a set of high-precision and high-sensitivity electromagnetic field measuring probes at the working frequency of 6GHz.This set of CPW probes uses a threedimensional moving measurement system to measure the near-electromagnetic fields generated by the microstrip calibration components and compare them with actual results.The results show that the CPW probe measurement results can accurately fit the real field distribution of the microstrip line.