Radiation target reconstruction method based on common mode impedance correction model
A common-mode impedance and model correction technology, which is applied to antenna radiation patterns, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of expensive instruments, unbearable for small and medium-sized enterprises, and inability to infer circuit radiation characteristics, so as to improve accuracy The effect of improving the accuracy of the method and robustness
Active Publication Date: 2014-07-09
NANJING HUASHI ELECTRONICS SCI
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[0003] At present, research on standard electromagnetic environments such as anechoic chambers has been carried out in high-tech industries such as the military industry. It can give the result of the field strength, but cannot give inferences about the radiation characteristics of the circuit (that is, common mode radiation or differential mode radiation), that is, it cannot make guiding suggestions on the cause of circuit radiation interference
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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] Such as figure 1 as shown, V DM is the PCB voltage signal (differential mode signal), C DM is the distributed capacitance of the PCB board, Ct-c is the distributed capacitance between the radiation cable and the PCB, I CM is the common-mode current of the radiating cable. for figure 1 The radiation model shown can be considered as radiated electromagnetic interference noise caused by the radiation cable itself and the common mode current in the radiation cable. In addition, due to the common mode current in the radiating cable and the PCB voltage signal V DM , PCB distributed capacitance C DM , the distributed capacitance between the radiation cable and the PCB Ct-c , Radiating cable input capacitance Cin , Radiating cable length l , The common mode current distribution of the radiation cable is related to t...
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A radiation target reconstruction method based on a common mode impedance correction model includes the following steps: 1: Use a PCB board with a radiation cable length l=0.5m, set the wavelength λ=4l, and calculate its corresponding frequency f=c / λ , Two: Divide the common-mode current spectrum of the radiation cable into two regions according to f, namely f1 and f2, where f1 <f，而f2>f; according to l <λ 4、l>λ / 4 uses the dipole antenna model and the slender straight antenna radiation model to calculate the common-mode impedance of the radiating cable. Three: For the frequency band f1, use the dipole antenna model to calculate the common-mode impedance of the radiating cable: Four: For For the frequency band f2, the slender straight antenna model is used to calculate the common mode impedance of the radiation cable: where: c is the speed of light, l is the length of the PCB radiation cable, λ is the wavelength, and k is the wave number; the radiation obtained from the third and fourth steps The cable common-mode impedance is substituted into the voltage drive model, that is, the correction of the radiation cable common-mode impedance is realized.< / λ>
Description
technical field [0001] The present invention relates to a method for measuring circuit parameters of a high-speed digital circuit and estimating a method for near-field radiation characteristics of the circuit, in particular to a radiation target reconstruction method based on a common-mode impedance correction model, specifically a high-frequency method based on voltage measurement The analysis and prediction method of electromagnetic radiation characteristics in circuit space provides a prerequisite for the mechanism judgment and suppression of radiated electromagnetic interference (EMI) noise, and belongs to the field of electromagnetic compatibility technology. Background technique [0002] At present, most researches on radiation target reconstruction and mechanism description use standard electromagnetic environments such as anechoic chambers, which can accurately know the radiation field strength, and judge whether it passes the mandatory electromagnetic compatibility...
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IPC IPC(8): G01R27/08G01R29/10G01R29/26
Inventor 张岳明张晨张宇环
Owner NANJING HUASHI ELECTRONICS SCI