CN101625388A - Method for detecting coupling response of cable under excitation of electromagnetic wave - Google Patents

Abstract

The invention discloses a method for detecting coupling response of a cable under the excitation of electromagnetic wave, which comprises the following steps: introducing an equivalent radiation source Si (Gi, Li,), the excitation Gi(gi, phi i) of the equivalent radiation source and cable border KL(1, a, D, sigma, epsilon, mu) into a numerical analysis platform of an electromagnetic field; and analyzing the introduced sources to obtain the current electromagnetic wave total field information Ei(ei, theta i). The invention combines an HFSS platform with a correction Taylor model (see the formula enclosed in the right drawing) under the radiation of a single interference source so as to obtain the terminal response of a cable used for connecting with two interfered devices under the radiation of electromagnetic waves generated by a plurality of interference devices. The method can be used for predicting the coupling response state of a cable under the excitation of incident electromagnetic wave so as to provide reference information for device level and system level electromagnetic compatibility designs.

Description

A kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave

Technical field

The present invention relates to a kind of method for detecting coupling response, more particularly say, be meant a kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave, belong to electromagnetic compatibility technology coupled interference prediction field.

Background technology

In electric or electronic equipment, cable (cable or wire) is to be used for ways of connecting between realization equipment and equipment, the equipments and devices.When the common collaborative work of a plurality of equipment, the equipment that has can produce electromagnetic interference (EMI), and this electromagnetic interference (EMI) can be coupled on another equipment by cable, causes the performance of another equipment to descend, even can't operate as normal.Along with the widespread use of digital device and integrated circuit, electronic equipment is responsive especially to external electromagnetic field, and external electromagnetic field gets more and more people's extensive concerning by the electromagnetic interference (EMI) of the electromagnetic coupled effect generation of cable always.

For the analysis of field-line coupled system, the method for employing mainly is divided into directly based on the Finite Difference-Time Domain branch of Maxwell equation with based on transmission line model two classes at present.The former directly finds the solution the cable boundary value problem from the Maxwell equation.These class methods are strict in theory, but it is in actual applications to computing time and request memory strictness.The latter sets up the equation for transmission line of one group of equivalence by analyzing cable.Present the describing external electromagnetic field based on the Maxwell equation inference coupled transfer line model of cable had three kinds of comparative maturity: Taylor model, Agrawal model and Rachidi model.The common defects of these three kinds of models is that model is to be described by incident wave component, need priori knowledge be arranged to incident wave information, is not suitable for being difficult to obtain or can not obtain in the big system complex electromagnetic environment situation of the definite information of incident wave.

The Taylor model is disclosed in the IEEE TRANSACTIONS ONANTENNAS AND PROPAGATION in August 26 nineteen sixty-five, and article name is " The Response of a TerminatedTwo-Wire Transmission Line Excited by a Nonuniform ElectromagneticField ".

HFSS (High Frequency Structure Simulator) is based on the 3 D electromagnetic simulation software of the analysis microwave engineering problem of electromagnetic finite element method.This software can be realized antenna, array antenna and feed design, radio frequency and microwave device design, high frequency IC design, High Speed PCB Board and the design of RF pcb board etc.Microwave designing person can correctly discern, handle galvanomagnetic effect by HFSS, and this also is the reason why HFSS becomes the golden standard of microwave/RF designs.For any three-D high frequency microwave device, as waveguide, wave filter, coupling mechanism, connector, ferrite device resonant cavity etc., HFSS can both provide instrument to realize S parameter extraction, production debugging and optimization, finally reaches the manufacturing requirement.

The microwave antenna deviser can use HFSS and design, optimizes and predict antenna performance.To complicated radar shielding harness and any feeding network, HFSS its electromagnetic performance that can both calculate to a nicety comprises radiation direction figure, lobe width, internal electromagnetic field distribution or the like from simple monopole antenna.

Summary of the invention

Obtain the performance impact of the electromagnetic wave of jamming equipment generation for convenience efficiently to Cable Termination Equipment, the present invention proposes a kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave, and this method for detecting coupling response utilizes the correction Taylor model under HFSS platform and the single interference source radiation $\left\{\begin{array}{c}\frac{\∂V\left(x\right)}{\∂x}+Z^{\′}I\left(x\right)=-\mathrm{j\ω}{\mathrm{\μ}}_0{\∫}_0^d{H}_y(x,z)\mathrm{dz}\\ V\left(x\right)=-{\∫}_0^d{E}_z(x,z)\mathrm{dz}\end{array}\right.$ Combine, respond thereby obtain the cable terminations that electromagenetic wave radiation that a plurality of jamming equipments produce being used to down connect two disturbed equipment rooms.Method for detecting coupling response of cable disclosed by the invention can be used to predict the incident electromagnetic wave excitation coupling response situation on the cable down, thereby provides information reference for device level and system-level EMC Design.

A kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave of the present invention is that the method for detecting coupling response of cable under excitation of electromagnetic wave is to be subjected to the electromagnetic wave effect in order to quantize to be connected two cables between the disturbed equipment; Include the following step:

The first step: obtain equivalent radiation source S _i(G _i, L _i)

The equivalence radiation source includes the excitation G of the number i of equivalent radiation source, equivalent radiation source _i(g _i, φ _i) and the size L of equivalent radiation source _i, then any one equivalent radiation source expression-form is S _i(G _i, L _i); The size L of described radiation source _iInclude the long LA of radiation source _i, wide LB _i, high LC _iPerhaps radius LR _i, if radiation source is when being cylindrical shape, the size L of equivalent radiation source then _iChoose long LA _iWith radius LR _iIf radiation source is when being rectangular shape, the size L of radiation source then _iChoose long LA _i, wide LB _i, high LC _i

Second step: obtain the total field information E of equivalent radiate source radiation _i(e _i, θ _i)

With equivalent radiation source S _i(G _i, L _i), the excitation G of equivalent radiation source _i(g _i, φ _i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform, resolves and obtains the current total field information E of electromagnetic wave _i(e _i, θ _i);

At given G _i(g _i, φ _i) under, jamming equipment equivalence radiation source is that the field distribution of cylindrical monopole antenna is:

In the near field region when (r≤λ/2 π), the field distribution of equivalent radiation source $\left\{\begin{array}{c}H=\frac{I\&times;\mathrm{<figure-callout\; id="2"\; label="L\; A\; i"\; filenames="A2009100893700019H1.png"\; state="\{\{state\}\}">L</figure-callout>}{A}_i{}_{}}{2\mathrm{\&pi;}{r}^2}\\ E=\frac{30\&times;I\&times;L{A}_i\&times;\mathrm{\&lambda;}}{\mathrm{\&pi;}{\mathrm{<figure-callout\; id="3"\; label="r"\; filenames="A2009100893700019H1.png"\; state="\{\{state\}\}">r</figure-callout>}}^3}\end{array}\right.,$ And $I=j\frac{\mathrm{\&pi;}{G}_i(g_i,{\mathrm{\&phi;}}_i)}{25\ln \left(\frac{L{A}_i}{L{R}_i}\right)};$

In the far-field region when (r＞λ/2 π), the field distribution of equivalent radiation source $\left\{\begin{array}{c}H=\frac{I\&times;L{A}_i}{\mathrm{\&lambda;r}}\\ E=\frac{120\mathrm{\&pi;}\&times;I\&times;L{A}_i}{\mathrm{\&lambda;r}}\end{array}\right.,$ And $I=j\frac{\mathrm{\&pi;}{G}_i(g_i,{\mathrm{\&phi;}}_i)}{25\ln \left(\frac{L{A}_i}{L{R}_i}\right)};$

With cable border KL (l, a, D, σ, ε is μ) as the Maxwell equation $\left\{\begin{array}{c}\&dtri;\&times;{\stackrel{\&RightArrow;}{H}}_i=\frac{\&PartialD;\mathrm{\&epsiv;}{\stackrel{\&RightArrow;}{E}}_i}{\&PartialD;t}\\ \&dtri;\&times;{\stackrel{\&RightArrow;}{E}}_i=-\frac{\&PartialD;\mathrm{\&mu;}{\stackrel{\&RightArrow;}{H}}_i}{\&PartialD;t}\end{array}\right.$ Boundary condition, find the solution and obtain the total field information E of electromagnetic wave _i(e _i, θ _i);

The 3rd step: obtain cable terminations voltage V _i(l)

According to revising the Taylor model $\left\{\begin{array}{c}\frac{\&PartialD;V\left(X\right)}{\&PartialD;X}+Z^{\&prime;}I\left(X\right)=-\mathrm{j\&omega;}{\mathrm{\&mu;}}_0{\&Integral;}_0^D{H}_Y(X,Z)\mathrm{dz}\\ V\left(X\right)=-{\&Integral;}_0^D{E}_Z(X,Z)\mathrm{dz}\end{array}\right.$ To the total field information E of electromagnetic wave _i(e _i, θ _i) carry out integral operation, thus cable terminations voltage obtained $V_i\left(l\right)=-{\&Integral;}_0^D{E}_i(e_i,{\mathrm{\&theta;}}_i)\mathrm{dz}.$

A kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave of the present invention in complex electromagnetic environment, has a plurality of jamming equipments, and this just need carry out modeling to different radiation sources; When a plurality of jamming equipments are carried out coupling response of cable, repeat the first step to the process in three steps, and note equivalent radiation source model, the jamming equipment excitation of each jamming equipment and the cable terminations voltage under the cable border, utilize superposition principle to obtain cable terminations voltage under a plurality of equipment common interference then.

A kind of advantage that is applicable to the method for detecting coupling response of cable under the excitation of electromagnetic wave of the present invention:

1. based on " road " and transmission line theory, do not need to consider complex conditions, simplified the analysis of field-line coupled system.

2. because correction Taylor model is based on total field component, need not to quantize the response that each independent incident electromagnetic wave is coupled to cable, simplified the difficulty that coupling response detects.

3. in revising the Taylor model, total field component can obtain by numerical simulation platform (HFSS), in conjunction with different aftertreatment platforms, can obtain multi-form resultant field component information, obtain coupling response on the corresponding cable flexibly, for example obtain required resultant field component amplitude maximal value, can analyses and prediction " worst case " end-line coupling response.

4. the correction Taylor model among the present invention is based on resultant field information, and this model fully takes into account the influence of cable surrounding environment to coupling response, is fit to electromagnetic field and is coupled to situation on the cable by labyrinths such as hole slot coupling.

5. the field information that actual test obtains also is the resultant field component information, combines with this correction Taylor model to realize field-line coupling prediction, the engineering significance with reality.

6. under the condition of incidence of a plurality of incident waves, realized " field " the be added to conversion of stack on " road ", simplified complicated degree of analysis, realized " field " collaborative analysis with " road ".

Description of drawings

Fig. 1 is the physical model structure figure of field-line coupled system.

Figure 1A is the equivalent circuit diagram of field-line coupled system.

Fig. 2 is the floor map at HFSS platform of the present invention midfield-line coupled system.

Fig. 2 A is the amplification assumption diagram of equivalent source monopole antenna.

Fig. 3 is the surface chart of Numerical Calculation of Electromagnetic Field platform among the present invention.

Fig. 4 is the coupling response of cable detecting operation process flow diagram of the present invention under excitation of electromagnetic wave.

Fig. 5 is the physical model structure figure that has the field-line coupled system of two jamming equipments.

Fig. 5 A is the amplitude versus frequency characte figure of the resultant field of the cylindrical monopole antenna of A jamming equipment equivalence among the embodiment 1.

Fig. 5 B is the amplitude versus frequency characte figure of the resultant field of the cylindrical monopole antenna of B jamming equipment equivalence among the embodiment 1.

Fig. 6 is the cable terminations response that obtains among the embodiment 1.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing.

Referring to shown in Figure 1, to realize being connected by cable between the disturbed equipment of A and the disturbed equipment of B among the figure, this cable can be realized mutual transmission information between disturbed equipment of A and the disturbed equipment of B.In working order down, the electromagnetic wave that jamming equipment produces can be coupled on the disturbed equipment by cable, and the work quality of disturbed equipment is exerted an influence.The disturbed equipment of A, the disturbed equipment of B, cable and electromagnetic wave just form a field-line coupled system physical model.The length of on the scene-line coupled system physical model cable is designated as l, and (unit: m), the radius of cable is designated as a, and (unit: m), the distance on cable and ground is designated as D (unit: m).

Shown in Figure 1A, this Figure 1A is the equivalent electrical circuit of field-line coupled system physical model shown in Figure 1.The disturbed equipment equivalence of A is first impedance Z among the figure ₁, the disturbed equipment equivalence of B is second impedance Z ₂With the direction perpendicular to ground is that the Z axle is set up a right-handed coordinate system, and wherein true origin O is first impedance Z ₁The projected centre point of projection on the ground, the positive dirction of X-axis are that direction is stretched on vertical edge of cable, point to first impedance Z by ground ₁Direction be the positive dirction of Z axle.

In order to quantize first impedance Z in the equivalent electrical circuit shown in Figure 1A ₁With second impedance Z ₂Be subjected to the electromagnetic wave effect (promptly to be connected two cables between jamming equipment, the cable of this cable under equivalent radiation source model, jamming equipment excitation and the cable boundary condition of jamming equipment is subjected to the electromagnetic wave effect, this influence degree has adopted magnitude of voltage to express), the present invention proposes a kind of detection method that conveniently detects under the Electromagnetic Interference that the equipment that is interfered produces.

Referring to shown in Figure 4, a kind of method for detecting coupling response of cable under excitation of electromagnetic wave of the present invention, this detection step is:

The first step: obtain equivalent radiation source S _i(G _i, L _i)

The process of jamming equipment radiation field can be come equivalence by setting up an equivalent radiation source model, and equivalent radiation source is described by radiation source form and excitation.By setting up equivalent radiation source model, corresponding driving source and radiation border are set, by means of electromagnetic field numerical simulation platform (HFSS platform), can obtain the information of jamming equipment radiation field.

The equivalence radiation source includes the excitation G of the number i of equivalent radiation source, equivalent radiation source _i(g _i, φ _i) and the size L of equivalent radiation source _i, then any one equivalent radiation source expression-form is S _i(G _i, L _i).The size L of described radiation source _iInclude the long LA of radiation source _i, wide LB _i, high LC _iPerhaps radius LR _i, if radiation source is when being cylindrical shape, the size L of equivalent radiation source then _iChoose long LA _iWith radius LR _iIf radiation source is when being rectangular shape, the size L of radiation source then _iChoose long LA _i, wide LB _i, high LC _i

Shown in Fig. 2, Fig. 2 A, in the present invention, be a cylindrical monopole antenna with a jamming equipment equivalence among Fig. 1, the radiation information of this cylindrical monopole antenna is designated as S ₁(G ₁, LA ₁, LR ₁).If two jamming equipments are arranged under the environment of cable place, then have two radiation sources, radiation information is designated as first radiation information respectively and is designated as S at this moment ₁(G ₁, LA ₁, LR ₁), second radiation information is designated as S ₂(G ₂, LA ₂, LR ₂).

The present invention is that cylindrical monopole antenna is owing to the jamming equipment radiated electromagnetic wave mainly is that common mode radiation causes with the jamming equipment equivalence.And the structure of monopole antenna can simulate the process of common mode radiation well.

Second step: obtain the total field information E of equivalent radiate source radiation _i(e _i, θ _i)

Referring to shown in Figure 3, with equivalent radiation source S _i(G _i, L _i), the excitation G of equivalent radiation source _i(g _i, φ _i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform, resolves and obtains the current total field information E of electromagnetic wave _i(e _i, θ _i).

At given G _i(g _i, φ _i) under, jamming equipment equivalence radiation source is that the field distribution of cylindrical monopole antenna is:

In the near field region when (r≤λ/2 π), the field distribution of equivalent radiation source $\left\{\begin{array}{c}H=\frac{I\&times;\mathrm{<figure-callout\; id="2"\; label="L\; A\; i"\; filenames="A2009100893700019H1.png"\; state="\{\{state\}\}">L</figure-callout>}{A}_i{}_{}}{2\mathrm{\&pi;}{r}^2}\\ E=\frac{30\&times;I\&times;L{A}_i\&times;\mathrm{\&lambda;}}{\mathrm{\&pi;}{\mathrm{<figure-callout\; id="3"\; label="r"\; filenames="A2009100893700019H1.png"\; state="\{\{state\}\}">r</figure-callout>}}^3}\end{array}\right.,$ And $I=j\frac{\mathrm{\&pi;}{G}_i(g_i,{\mathrm{\&phi;}}_i)}{25\ln \left(\frac{L{A}_i}{L{R}_i}\right)};$

In the far-field region when (r＞λ/2 π), the field distribution of equivalent radiation source $\left\{\begin{array}{c}H=\frac{I\&times;L{A}_i}{\mathrm{\&lambda;r}}\\ E=\frac{120\mathrm{\&pi;}\&times;I\&times;L{A}_i}{\mathrm{\&lambda;r}}\end{array}\right.,$ And $I=j\frac{\mathrm{\&pi;}{G}_i(g_i,{\mathrm{\&phi;}}_i)}{25\ln \left(\frac{L{A}_i}{L{R}_i}\right)}.$

With cable border KL (l, a, D, σ, ε is μ) as the Maxwell equation $\left\{\begin{array}{c}\&dtri;\&times;{\stackrel{\&RightArrow;}{H}}_i=\frac{\&PartialD;\mathrm{\&epsiv;}{\stackrel{\&RightArrow;}{E}}_i}{\&PartialD;t}\\ \&dtri;\&times;{\stackrel{\&RightArrow;}{E}}_i=-\frac{\&PartialD;\mathrm{\&mu;}{\stackrel{\&RightArrow;}{H}}_i}{\&PartialD;t}\end{array}\right.$ Boundary condition, find the solution and obtain the total field information E of electromagnetic wave _i(e _i, θ _i).

The 3rd step: obtain cable terminations voltage V _i(l)

According to revising the Taylor model $\left\{\begin{array}{c}\frac{\&PartialD;V\left(X\right)}{\&PartialD;X}+Z^{\&prime;}I\left(X\right)=-\mathrm{j\&omega;}{\mathrm{\&mu;}}_0{\&Integral;}_0^D{H}_Y(X,Z)\mathrm{dz}\\ V\left(X\right)=-{\&Integral;}_0^D{E}_Z(X,Z)\mathrm{dz}\end{array}\right.$ To the total field information E of electromagnetic wave _i(e _i, θ _i) carry out integral operation, thus cable terminations voltage obtained $V_i\left(l\right)=-{\&Integral;}_0^D{E}_i(e_i,{\mathrm{\&theta;}}_i)\mathrm{dz};$

In complex electromagnetic environment, have a plurality of jamming equipments, this just need carry out modeling to different radiation sources.When a plurality of jamming equipments are carried out coupling response of cable, repeat the first step to the process in three steps, and note the excitation of the equivalent radiation source model of each jamming equipment, equivalent radiation source and the cable terminations voltage under the cable border, utilize superposition principle to obtain cable terminations voltage under a plurality of equipment common interference then.

In the present invention, transmission line model is when analyzing the field wire coupled problem, based on Maxwell equation, and by rationally approximate, one group of the telegraph equation that obtains about the current/voltage on the cable.Also can equivalence encourage transmission line for voltage source and the current source that distributes, wherein voltage source of Fen Buing and current source are by the incident field component statement.

Embodiment 1:

Referring to shown in Figure 5, cable is connected between disturbed equipment of A and the disturbed equipment of B, and cable carries out coupling response of cable and detects and to be under the electromagnetic interference (EMI) that is subjected to A jamming equipment and B jamming equipment:

Cable parameter: l=1m, d=0.01m, a=0.0015m, Z ₁=Z ₂=300 Ω.

With the equivalence of A jamming equipment is first cylindrical monopole antenna (shown in Fig. 2 A), its length L A ₁=1.077 * 10 ^-4M, radius LR ₁=5 * 10 ^-6M, driving source voltage amplitude v ₁=3V, phase ₁=25 °, simulation frequency f=696.5MHZ.

With the equivalence of B jamming equipment is second cylindrical monopole antenna (shown in Fig. 2 A), its length L A ₂=8.965 * 10 ^-5M, radius LR ₂=5 * 10 ^-6M, driving source voltage amplitude v ₂=3.4V, phase ₂=-1.6 °, simulation frequency f=836.5MHZ.

Cable border: conductivity σ=5.7 * 10 ⁷(S/m of unit), DIELECTRIC CONSTANT=8.85 * 10 ^-12(F/m of unit), magnetic permeability μ=4 π * 10 ^-7(H/m of unit).

Above-mentioned parameter is carried out typing by interface shown in Figure 3, resolve the total field information of electromagnetic wave under the electromagnetic interference (EMI) that obtains A jamming equipment and the generation of B jamming equipment by the Numerical Calculation of Electromagnetic Field platform, shown in Fig. 5 A, Fig. 5 B.In Fig. 5 A, solid line represents that the A jamming equipment distributes at the electric field phase of cable terminations along the Z axle.Dotted line represents that the A jamming equipment distributes in the electric field amplitude of cable terminations along the Z axle.In Fig. 5 B, solid line represents that the B jamming equipment distributes at the electric field phase of cable terminations along the Z axle.Dotted line represents that the B jamming equipment distributes in the electric field amplitude of cable terminations along the Z axle.Fig. 5 A and Fig. 5 B are contrasted as can be known, and under the amplitude and phase condition of difference excitation, the response that connects the cable of disturbed equipment is different.

The corresponding data of Fig. 5 A, Fig. 5 B is brought into correction Taylor model $\left\{\begin{array}{c}\frac{\&PartialD;V\left(X\right)}{\&PartialD;X}+Z^{\&prime;}I\left(X\right)=-\mathrm{j\&omega;}{\mathrm{\&mu;}}_0{\&Integral;}_0^D{H}_Y(X,Z)\mathrm{dz}\\ V\left(X\right)=-{\&Integral;}_0^D{E}_Z(X,Z)\mathrm{dz}\end{array}\right.$ In find the solution and obtain as shown in Figure 6.

Each parameter of cable and resultant field component information are brought into the voltage responsive that correction Taylor model obtains two radiation sources, i.e. V ₁(l) and V ₂(l), V ₁(l) voltage responsive, the V of expression A jamming equipment ₂(l) voltage responsive of expression B jamming equipment.Use superposition principle then and obtain the terminal voltage response of cable under the common excitation of two radiation sources, as shown in Figure 6.

Embodiment 2:

Referring to shown in Figure 5, cable is connected between disturbed equipment of A and the disturbed equipment of B, and cable carries out coupling response of cable and detects and to be under the electromagnetic interference (EMI) that is subjected to A jamming equipment and B jamming equipment:

Cable parameter: l=1m, d=0.01m, a=0.0015m, Z ₁=Z ₂=300 Ω.

With the equivalence of A jamming equipment is first rectangular monopole antenna (shown in Fig. 2 B), its length L A ₁=5 * 10 ^-6M, wide LB ₁=5 * 10 ^-6M, high LC _i=1.077 * 10 ^-4M, driving source voltage amplitude v ₁=3V, phase ₁=25 °, simulation frequency f=696.5MHZ.

With the equivalence of B jamming equipment is second square cylindricality monopole antenna (shown in Fig. 2 B), its length L A ₂=5 * 10 ^-6M, wide LB _i=5 * 10 ^-6M, high LC _i=8.965 * 10 ^-5M, driving source voltage amplitude v ₂=3.4V, phase ₂=-1.6 °, simulation frequency f=836.5MHZ.

Cable border: conductivity σ=5.7 * 10 ⁷(S/m of unit), DIELECTRIC CONSTANT=8.85 * 10 ^-12(F/m of unit), magnetic permeability μ=4 π * 10 ^-7(H/m of unit).

Above-mentioned parameter is carried out typing by interface shown in Figure 3, resolve the total field information of electromagnetic wave under the electromagnetic interference (EMI) that obtains A jamming equipment and the generation of B jamming equipment by the Numerical Calculation of Electromagnetic Field platform.

The total field information corresponding data of electromagnetic wave is brought into correction Taylor model $\left\{\begin{array}{c}\frac{\&PartialD;V\left(X\right)}{\&PartialD;X}+Z^{\&prime;}I\left(X\right)=-\mathrm{j\&omega;}{\mathrm{\&mu;}}_0{\&Integral;}_0^D{H}_Y(X,Z)\mathrm{dz}\\ V\left(X\right)=-{\&Integral;}_0^D{E}_Z(X,Z)\mathrm{dz}\end{array}\right.$ In find the solution the voltage responsive that obtains disturbed equipment of A and the disturbed equipment of B respectively, use superposition principle then and obtain the terminal voltage response of cable under the common excitation of A jamming equipment and B jamming equipment.

A kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave of the present invention is by with equivalent radiation source S _i(G _i, L _i), the excitation G of equivalent radiation source _i(g _i, φ _i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform (HFSS), resolves and obtains the current total field information E of electromagnetic wave _i(e _i, θ _i), then with the total field information E of equivalent radiate source radiation _i(e _i, θ _i) substitution correction Taylor model $\left\{\begin{array}{c}\frac{\&PartialD;V\left(X\right)}{\&PartialD;X}+Z^{\&prime;}I\left(X\right)=-\mathrm{j\&omega;}{\mathrm{\&mu;}}_0{\&Integral;}_0^D{H}_Y(X,Z)\mathrm{dz}\\ V\left(X\right)=-{\&Integral;}_0^D{E}_Z(X,Z)\mathrm{dz}\end{array}\right.$ To the total field information E of electromagnetic wave _i(e _i, θ _i) carry out integral operation, thus cable terminations voltage obtained $V_i\left(l\right)=-{\&Integral;}_0^D{E}_i(e_i,{\mathrm{\&theta;}}_i)\mathrm{dz}.$ The correction Taylor model that the present invention uses $\left\{\begin{array}{c}\frac{\&PartialD;V\left(X\right)}{\&PartialD;X}+Z^{\&prime;}I\left(X\right)=-\mathrm{j\&omega;}{\mathrm{\&mu;}}_0{\&Integral;}_0^D{H}_Y(X,Z)\mathrm{dz}\\ V\left(X\right)=-{\&Integral;}_0^D{E}_Z(X,Z)\mathrm{dz}\end{array}\right.$ Adopt total field component to be described, need not each jamming equipment is carried out separate analysis, therefore be suitable for complex electromagnetic environments in the big system.

Following table is the physical significance of letter in the formula involved in the present invention:

Claims (4)

1, a kind of method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave is characterized in that: the method for detecting coupling response of cable under excitation of electromagnetic wave is to be subjected to the electromagnetic wave effect in order to quantize to be connected two cables between the disturbed equipment; Include the following step:

The first step: obtain equivalent radiation source S _i(G _i, L _i)

The equivalence radiation source includes the excitation G of the number i of equivalent radiation source, equivalent radiation source _i(g _i, φ _i) and the size L of equivalent radiation source _i, then any one equivalent radiation source expression-form is S _i(G _i, L _i); The size L of described radiation source _iInclude the long LA of radiation source _i, wide LB _i, high LC _iPerhaps radius LR _i, if radiation source is when being cylindrical shape, the size L of equivalent radiation source then _iChoose long LA _iWith radius LR _iIf radiation source is when being rectangular shape, the size L of radiation source then _iChoose long LA _i, wide LB _i, high LC _i

Second step: obtain the total field information E of equivalent radiate source radiation _i(e _i, θ _i)

With equivalent radiation source S _i(G _i, L _i), the excitation G of equivalent radiation source _i(g _i, φ _i) and cable border KL (l, a, D, σ, ε μ) introduces in the Numerical Calculation of Electromagnetic Field platform, resolves and obtains the current total field information E of electromagnetic wave _i(e _i, θ _i);

At given G _i(g _i, φ _i) under, jamming equipment equivalence radiation source is that the field distribution of cylindrical monopole antenna is:

In the near field region when (r≤λ/2 π), the field distribution of equivalent radiation source $\left\{\begin{array}{c}H=\frac{I\&times;{\mathrm{LA}}_i}{2\mathrm{\&pi;}{r}^2}\\ E=\frac{30\&times;I\&times;{\mathrm{LA}}_i\&times;\mathrm{\&lambda;}}{\mathrm{\&pi;}{r}^3}\end{array}\right.,$ And

$I=j\frac{\mathrm{\&pi;}{G}_i(g_i,{\mathrm{\&phi;}}_i)}{25\ln \left(\frac{{\mathrm{LA}}_i}{{\mathrm{LR}}_i}\right)};$

In the far-field region when (r＞λ/2 π), the field distribution of equivalent radiation source $\left\{\begin{array}{c}H=\frac{I\&times;{\mathrm{LA}}_i}{\mathrm{\&lambda;}r}\\ E=\frac{120\mathrm{\&pi;}\&times;I\&times;{\mathrm{LA}}_i}{\mathrm{\&lambda;r}}\end{array}\right.,$ And

$I=j\frac{\mathrm{\&pi;}{G}_i(g_i,{\mathrm{\&phi;}}_i)}{25\ln \left(\frac{{\mathrm{LA}}_i}{{\mathrm{LR}}_i}\right)};$

With cable border KL (l, a, D, σ, ε is μ) as the Maxwell equation $\left\{\begin{array}{c}\&dtri;\&times;{\stackrel{\&RightArrow;}{H}}_i=\frac{\&PartialD;\mathrm{\&epsiv;}{\stackrel{\&RightArrow;}{E}}_i}{\&PartialD;t}\\ \&dtri;\&times;{\stackrel{\&RightArrow;}{E}}_i=-\frac{\&PartialD;\mathrm{\&mu;}{\stackrel{\&RightArrow;}{H}}_i}{\&PartialD;t}\end{array}\right.$ Boundary condition, find the solution and obtain the total field information E of electromagnetic wave _i(e _i, θ _i);

The 3rd step: obtain cable terminations voltage V _i(l)

According to revising the Taylor model $\left\{\begin{array}{c}\frac{\&PartialD;V}{\&PartialD;X}+Z^{\&prime;}I\left(X\right)=-\mathrm{j\&omega;}{\mathrm{\&mu;}}_0{\&Integral;}_0^D{H}_Y(X,Z)\mathrm{dz}\\ V\left(X\right)=-{\&Integral;}_0^D{E}_Z(X,Z)\mathrm{dz}\end{array}\right.$ To the total field information E of electromagnetic wave _i(e _i, θ _i) carry out integral operation, thus cable terminations voltage obtained $V_i\left(l\right)=-{\&Integral;}_0^D{E}_i(e_i,{\mathrm{\&theta;}}_i)\mathrm{dz}.$

2, the method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave according to claim 1 is characterized in that: in complex electromagnetic environment, have a plurality of jamming equipments, this just need carry out modeling to different radiation sources; When a plurality of jamming equipments are carried out coupling response of cable, repeat the first step to the process in three steps, and note equivalent radiation source model, the jamming equipment excitation of each jamming equipment and the cable terminations voltage under the cable border, utilize superposition principle to obtain cable terminations voltage under a plurality of equipment common interference then.

3, the method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave according to claim 1, it is characterized in that: transmission line model is when analyzing the field wire coupled problem, based on Maxwell equation, by rationally approximate, one group of the telegraph equation that obtains about the current/voltage on the cable.

4, the method for detecting coupling response of cable that is applicable under the excitation of electromagnetic wave according to claim 1, it is characterized in that: transmission line model is when analyzing the field wire coupled problem, based on Maxwell equation, by rationally approximate, obtain voltage source and the current source excitation transmission line of equivalence for distributing, wherein voltage source of Fen Buing and current source are by the incident field component statement.

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