Radiation target reconstruction method based on common mode impedance correction model
A technology of common mode impedance and correction model, applied in antenna radiation pattern, measuring resistance/reactance/impedance, measuring device, etc., can solve problems such as expensive instruments, unbearable for small and medium-sized enterprises, and inability to provide guiding suggestions for the reasons of circuit radiation interference , to achieve the effect of improving the accuracy and robustness, and improving the accuracy of the method
Active Publication Date: 2012-07-04
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 comprises the following steps: 1 utilizing a printed circuit board (PCB) with a radiation cable in the length of l=0.5m, enabling a wavelength lambada to be 41, calculating the frequency f corresponding to the wavelength according to a formula of f=c / lambada; 2 dividing radiation cable common mode current frequency spectrum into two areas according to f, namely f1 and f2, wherein f1<f while f2>f; respectively utilizing a doublet antenna model and a thin and long straight antenna radiation model to calculate radiation cable common mode impedance according to l (lambada / 4, l) lambada / 4; 3 as for the frequency range f1, utilizing the doublet antenna model to calculate the radiation cable common mode impedance; 4 as for the frequency range f2, utilizing the thin and long straight antenna radiation model to calculate radiation cable common mode impedance; wherein c represents for light speed, l represents for the length of the radiation cable of the PCB, the lambada represents for the wavelength, and k represents for the wave number; and substituting the radiation cable common mode impedance obtained in the step 3 and the radiation cable common mode impedance obtained in the step 4 into a voltage driving module, and achieving common mode impedance correction of the radiation cable.
Description
Technical field [0001] The present invention involves the method of analyzing the circuit parameters and estimated circuit's near -field radiation characteristics of the high -speed digital circuit measurement circuit parameters, especially a radiation target reconstruction method based on the co -impedance correction model.Analysis and estimation method of electromagnetic radiation characteristics of circuit space, providing prerequisite for the mechanism judgment and suppression of radiation electromagnetic interference (EMI) noise, which belongs to the field of electromagnetic compatibility technology. Background technique [0002] At present, most of the radiation target reconstruction and mechanism description research adopts standard electromagnetic environments such as radio waves, which can accurately learn the strong radiation field. Based on this, it is determined whether it is compatible with electromagnetic compatibility.In order to effectively solve the problem of ra...
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Login to View More IPC IPC(8): G01R27/08G01R29/10G01R29/26
Inventor 张岳明张晨张宇环
Owner NANJING HUASHI ELECTRONICS SCI