CN113484633A - Shielding effectiveness test system and method suitable for electromagnetic protection performance test of artificial material - Google Patents
Shielding effectiveness test system and method suitable for electromagnetic protection performance test of artificial material Download PDFInfo
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Abstract
The invention provides a shielding effectiveness testing system and a method suitable for testing electromagnetic protection performance of artificial materials, wherein in the system, a synchronous controller is respectively connected with a high-field excitation seed signal source, a continuous wave seed signal source and a strong electromagnetic pulse source; the strong field excitation seed signal source, the strong electromagnetic pulse source and the transmitting antenna I are sequentially connected; the continuous wave seed signal source, the preposed power amplifier, the circulator and the transmitting antenna II are connected in sequence; the receiving antenna, the high-power filtering module and the signal acquisition module are sequentially connected; the shielding dark box is provided with an artificial material testing window; the receiving antenna is arranged in the shielding dark box; the first transmitting antenna and the second transmitting antenna are both arranged outside the shielding dark box. The electromagnetic shielding effectiveness testing device can realize electromagnetic shielding effectiveness testing of the artificial material under different strong electromagnetic pulse environment excitations, and effectively solves the problem that the electromagnetic protection performance of the artificial material is difficult to effectively test.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding effectiveness testing, in particular to a shielding effectiveness testing system and method suitable for electromagnetic protection performance testing of artificial materials.
Background
In recent years, with the rapid development of pulse power technology and high-power microwave technology, strong electromagnetic pulse threat is becoming more and more realistic, great threat is caused to the viability of an electronic system, and the research of protection reinforcement technology is urgently needed to be developed. The strong electromagnetic pulse enters the interior of the electronic system mainly through the coupling of a front door and a rear door, so that the normal work of the electronic system is influenced, and the protection and reinforcement of the front door and the rear door are effective means for improving the strong electromagnetic pulse resistance of the electronic system. Artificial electromagnetic shielding materials have been rapidly developed in recent years due to their unique electromagnetic shielding properties. When the external excitation field strength is lower than a certain limit value, the artificial electromagnetic protection material presents an insulating state, the insertion loss of electromagnetic waves is small, working signals can freely pass through, and an electronic system can normally operate; when the external excitation field strength exceeds a certain limit value, the nonlinear conductive property of the artificial electromagnetic protection material is excited, the material is in a conductive state, and incident electromagnetic waves can be quickly attenuated, so that an electronic system is effectively protected.
For electromagnetic protection materials, accurately characterizing and testing the shielding effectiveness of the materials is crucial to the practical protection application of the materials. At present, a series of testing methods are developed by domestic and foreign scholars aiming at the testing of the shielding effectiveness of electromagnetic protection materials. Generally, the method can be mainly divided into two types based on transmission line loading and free space loading; the transmission line loading method mainly comprises a coaxial flange method and a rectangular waveguide method, and the free space loading method mainly comprises a dielectric lens focusing method and a cavity (baffle) windowing method. In these methods, a continuous wave signal source is generally used as an emission source, and the shielding effectiveness is obtained by comparing and calculating the received signals with and without an electromagnetic protection material, so it is very difficult to realize a material shielding effectiveness test under strong field excitation. For the artificial electromagnetic protection material, the nonlinear conductive characteristic of the material can appear under the excitation of a strong field, so that the electromagnetic shielding efficiency of the material has stronger dependence on the field intensity of an external excitation strong field; therefore, the testing system and the testing method formed by the testing system are difficult to meet the testing requirement of the shielding effectiveness of the artificial electromagnetic protection material. Therefore, a shielding effectiveness testing system and a method suitable for testing the electromagnetic protection performance of the artificial material are developed, the electromagnetic shielding effectiveness test of the artificial material is developed, the electromagnetic protection capability of the artificial material is objectively evaluated, and the electromagnetic protection system and the method have important significance for the electromagnetic protection application of the artificial material and the improvement of the survivability of an electronic system in a complex electromagnetic environment, particularly a strong electromagnetic environment.
Disclosure of Invention
The invention aims to provide a shielding effectiveness testing system and a method suitable for testing electromagnetic protection performance of an artificial material, so as to solve the problem that the conventional testing system and testing method are difficult to meet the shielding effectiveness testing requirement of the artificial electromagnetic protection material.
The invention provides a shielding effectiveness test system suitable for testing electromagnetic protection performance of artificial materials, which comprises a synchronous controller, a strong field excitation seed signal source, a continuous wave seed signal source, a strong electromagnetic pulse source, a first transmitting antenna, a preposed power amplifier, a circulator, a second transmitting antenna, a shielding camera bellows, a receiving antenna, a high-power filtering module and a signal acquisition module, wherein the strong field excitation seed signal source is connected with the continuous wave seed signal source;
the synchronous controller is respectively connected with the strong field excitation seed signal source, the continuous wave seed signal source and the strong electromagnetic pulse source; the strong field excitation seed signal source, the strong electromagnetic pulse source and the transmitting antenna I are sequentially connected; the continuous wave seed signal source, the preposed power amplifier, the circulator and the transmitting antenna II are sequentially connected; the receiving antenna, the high-power filtering module and the signal acquisition module are sequentially connected; the shielding camera bellows is provided with an artificial material testing window; the receiving antenna is arranged in the shielding camera bellows and is opposite to the center of the artificial material testing window of the shielding camera bellows; the first transmitting antenna and the second transmitting antenna are both arranged outside the shielding dark box; the first transmitting antenna is obliquely opposite to the center of the artificial material testing window of the shielding camera bellows, and the second transmitting antenna is opposite to the center of the artificial material testing window of the shielding camera bellows;
the synchronous controller comprises a plurality of independent trigger pulse generating ports and is used for generating a plurality of paths of independent time sequence trigger pulses and triggering the strong field excitation seed signal source, the continuous wave seed signal source and the strong electromagnetic pulse source to work through the time sequence trigger pulses;
the strong field excitation seed signal source is used for generating a strong field excitation seed signal according to the set working parameters under the control of the synchronous controller;
the continuous wave seed signal source is used for generating a continuous wave seed signal according to the set working parameters under the control of the synchronous controller;
the strong electromagnetic pulse source is used for amplifying the strong field excitation seed signal under the control of the synchronous controller to generate a strong field excitation signal;
the first transmitting antenna is used for radiating a strong field excitation signal;
the preposed power amplifier is used for amplifying the continuous wave seed signal and generating a continuous wave signal for testing the shielding effectiveness of the artificial material;
the circulator is used for realizing the unidirectional transmission of the continuous wave signal from the front power amplifier to the second transmitting antenna;
the second transmitting antenna is used for radiating continuous wave signals;
the receiving antenna is used for receiving the electromagnetic signals transmitted by the shielding camera bellows under the condition that the artificial materials exist or do not exist on the artificial material testing window;
the high-power filtering module is used for filtering out a strong field excitation signal in the electromagnetic signal received by the receiving antenna;
the signal acquisition module is used for acquiring and recording the electromagnetic signals filtered by the high-power filtering module.
Further, the maximum output power P of the strong electromagnetic pulse source, the gain G of the first transmitting antenna and the included angle alpha between the radiation direction of the first transmitting antenna and the normal direction of the artificial material test window of the shielding dark box meet the following conditions:
wherein d is the distance between the center of one facet of the transmitting antenna and the center of the artificial material test window of the shielding dark box, EnThe electric field intensity required for exciting the nonlinear conductive characteristic of the artificial material is L, and the dimension of the artificial material test window of the shielding dark box is L.
Preferably, the artificial material test window of the shielding dark box is required to be arranged in a 3dB uniform area of the first transmitting antenna.
Preferably, the high-power filtering module is a band-stop filter.
Furthermore, the stopband bandwidth W of the band-stop filter and the pulse width T of the strong field excitation signalwSatisfies the relationship:
preferably, the signal acquisition module is a spectrum analyzer.
The invention also provides a shielding effectiveness testing method suitable for testing the electromagnetic protection performance of the artificial material, which comprises the following steps:
step 1, laying a shielding effectiveness testing system suitable for testing the electromagnetic protection performance of the artificial material on a test field;
step 2, the strong electromagnetic pulse source output power, the gain G of the transmitting antenna, the distance d between the center of one facet of the transmitting antenna and the center of the artificial material testing window of the shielding dark box and the included angle alpha between the radiation direction of the transmitting antenna and the normal direction of the artificial material testing window of the shielding dark box are cooperatively adjusted to enable the strong excitation field E of the artificial material to be in the range of 0 and Emax]Flexible adjustment is carried out; emaxRepresents the excitation intensity field maximum of interest;
step 3, setting the artificial material testing window to be in an idle state, namely, no artificial material exists;
step 4, testing the frequency range [ f ] according to the shielding effectiveness of the artificial materialmin,fmax]Setting the output signal frequency of the continuous wave seed signal source to be fcw[i]，fcw[i]∈[fmin,fmax]I is 0,1,2 …, and fcw[0]＝fmin(ii) a Setting the output signal frequency of the strong field excitation seed signal source as fhp[i]And f ishp[i]The following relationship is satisfied:
meanwhile, the center frequency of a stop band of the high-power filter module is set to be fhp[i]The stop band width W satisfies
step 6, acquiring the frequency f through a signal acquisition modulecw[i]Amplitude of time-transmitted electromagnetic signal A [ i ]]；
Step 7, setting the output signal frequency of the continuous wave seed signal source as the next test frequency fcw[i+1]If:
then the frequency f of the strong field excitation seed signal source is sethp[i+1]Comprises the following steps:
adjusting the system to keep the size of the artificial material excitation strong field E unchanged, and setting the center frequency of the stop band of the high-power filter module to be fhp[i+1]；
Otherwise, setting the frequency f of the strong field excitation seed signal sourcehp[i+1]Comprises the following steps:
fhp[i+1]＝fhp[i]
meanwhile, the center frequency of a stop band of the high-power filter module is set to be fhp[i+1]；
A＝{Ai|i＝0,1,2,…}
step 9, setting the artificial material testing window to be in a loading state, namely, artificial materials exist; repeating the step 4 to the step 7 to obtain the artificial material, and testing the frequency [ f ] under the condition that the excitation intensity field is Emin,fmax]Set of transmission electromagnetic signal amplitudes within range B:
B＝{Bi|i＝0,1,2,…}
step 10, obtaining the artificial material in the condition that the excitation intensity field is Emin,fmax]Shielding effectiveness in the frequency range:
SE＝{SEi|i＝0,1,2,…}
wherein:
In particular, when the full band test is performed in step 4, fmin＝10kHz，fmax＝40GHz。
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the shielding effectiveness testing system and method suitable for testing the electromagnetic protection performance of the artificial material, provided by the invention, can realize the electromagnetic shielding effectiveness testing of the artificial material under the excitation of different strong electromagnetic pulse environments, and effectively solve the problem that the electromagnetic protection performance of the artificial material is difficult to effectively test.
2. The shielding effectiveness testing system and method suitable for testing the electromagnetic protection performance of the artificial material can obtain the full-band (10 kHz-40 GHz) electromagnetic shielding effectiveness of the artificial material in different states (such as an insulating state and a conducting state), and has important significance for objective and comprehensive evaluation of the electromagnetic protection performance of the artificial material.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a shielding effectiveness testing system suitable for testing electromagnetic protection performance of an artificial material according to an embodiment of the present invention.
Fig. 2 is a flowchart of a shielding effectiveness testing method suitable for testing electromagnetic protection performance of an artificial material according to an embodiment of the present invention.
Icon: the system comprises a 1-synchronous controller, a 2-strong field excitation seed signal source, a 3-continuous wave seed signal source, a 4-strong electromagnetic pulse source, a 5-transmitting antenna I, a 6-prepositive power amplifier, a 7-circulator, an 8-transmitting antenna II, a 9-shielding dark box, a 10-artificial material testing window, an 11-receiving antenna, a 12-high power filtering module and a 13-signal acquisition module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the present embodiment provides a shielding effectiveness testing system suitable for testing electromagnetic protection performance of an artificial material, which includes a synchronous controller 1, a strong field excitation seed signal source 2, a continuous wave seed signal source 3, a strong electromagnetic pulse source 4, a first transmitting antenna 5, a pre-power amplifier 6, a circulator 7, a second transmitting antenna 8, a shielding dark box 9, a receiving antenna 11, a high-power filtering module 12, and a signal acquisition module 13;
the synchronous controller 1 is respectively connected with a strong field excitation seed signal source 2, a continuous wave seed signal source 3 and a strong electromagnetic pulse source 4; the strong field excitation seed signal source 2, the strong electromagnetic pulse source 4 and the transmitting antenna I5 are connected in sequence; the continuous wave seed signal source 3, the preposed power amplifier 6, the circulator 7 and the transmitting antenna II 8 are connected in sequence; the receiving antenna 11, the high-power filtering module 12 and the signal acquisition module 13 are connected in sequence; the shielding dark box 9 is provided with an artificial material testing window 10; the receiving antenna 11 is arranged in the shielding camera bellows 9 and is opposite to the center of the artificial material testing window 10 of the shielding camera bellows 9; the first transmitting antenna 5 and the second transmitting antenna 8 are both arranged outside the shielding dark box 9; the first transmitting antenna 5 is obliquely opposite to the center of the artificial material testing window 10 of the shielding dark box 9, and the second transmitting antenna 8 is opposite to the center of the artificial material testing window 10 of the shielding dark box 9;
the synchronous controller 1 comprises 3 independent trigger pulse generating ports and is used for generating 3 independent time sequence trigger pulses and triggering the strong field excitation seed signal source 2, the continuous wave seed signal source 3 and the strong electromagnetic pulse source 4 to work through the time sequence trigger pulses;
the strong field excitation seed signal source 2 is used for generating a strong field excitation seed signal according to the set working parameters under the control of the synchronous controller 1; the high-field excitation seed signal is a designated narrow-band high-power microwave seed signal, and the type 2 of the high-field excitation seed signal source can be N5172B;
the continuous wave seed signal source 3 is used for generating a continuous wave seed signal according to the set working parameters under the control of the synchronous controller 1; the model of the continuous wave seed signal source 3 can be E8257D;
the strong electromagnetic pulse source 4 is used for amplifying the strong field excitation seed signal under the control of the synchronous controller 1 to generate a strong field excitation signal; the strong field excitation signal is a narrow-band high-power microwave signal (signal frequency is 1.5GHz and pulse width is 50 ns);
the transmitting antenna I5 is used for radiating a strong field excitation signal, namely a narrow-band high-power microwave signal;
the preposed power amplifier 6 is used for amplifying the continuous wave seed signal and generating a continuous wave signal for testing the shielding effectiveness of the artificial material;
the circulator 7 is used for realizing the unidirectional transmission of the continuous wave signal from the front power amplifier 6 to the second transmitting antenna 8;
the second transmitting antenna 8 is used for radiating continuous wave signals;
the receiving antenna 11 is used for receiving electromagnetic signals transmitted by the artificial material on the artificial material testing window 10 of the shielding dark box 9 under the condition that the artificial material exists or does not exist;
the high-power filtering module 12 is configured to filter a strong-field excitation signal in the electromagnetic signal received by the receiving antenna 11;
the signal acquisition module 13 is used for acquiring and recording the electromagnetic signals filtered by the high-power filtering module 12; the signal acquisition module 13 is preferably a spectrum analyzer.
Further, the maximum output power P (which may be 0.8MW) of the strong electromagnetic pulse source 4, the gain G of the transmitting antenna one 5, and the included angle α between the radiation direction of the transmitting antenna one 5 and the normal direction of the artificial material testing window 10 of the shielding dark box 9 satisfy the following conditions:
wherein d is the distance between the center of the first 5-aperture surface of the transmitting antenna and the center of the artificial material testing window 10 of the shielding dark box 9, EnRequired for exciting nonlinear conductive characteristic of artificial materialThe electric field strength, L, is the artificial material test window 10 size (which may be 0.6m) of the shielded dark box 9.
Further, the artificial material test window 10 of the shielding dark box 9 needs to be arranged in a 3dB uniform area of the first transmitting antenna 5.
Further, the high power filter module 12 is a band-stop filter. The stopband bandwidth W of the bandstop filter can be 200MHz, and the stopband bandwidth W is equal to the pulse width T of the strong field excitation signalwThe interval satisfies:
by using the shielding effectiveness testing system suitable for testing the electromagnetic protection performance of the artificial material, the embodiment further provides a shielding effectiveness testing method suitable for testing the electromagnetic protection performance of the artificial material, as shown in fig. 2, which includes the following steps:
step 1, laying a shielding effectiveness testing system suitable for testing the electromagnetic protection performance of the artificial material on a test field;
step 2, the output power of the strong electromagnetic pulse source 4, the gain G of the transmitting antenna I5, the distance d between the center of the opening surface of the transmitting antenna I5 and the center of the artificial material testing window 10 of the shielding dark box 9 and the included angle alpha between the radiation direction of the transmitting antenna I5 and the normal direction of the artificial material testing window 10 of the shielding dark box 9 are cooperatively adjusted to enable the strong excitation field E of the artificial material to be in the range of 0 and Emax]Flexible adjustment is carried out; emaxRepresents the excitation intensity field maximum of interest; in this embodiment, the range of the excitation intensity field is [0,20kV/m ]]I.e. Emax＝20kV/m；
Step 3, setting the artificial material testing window 10 to be in an idle state, namely, no artificial material exists;
step 4, testing the frequency range [ f ] according to the shielding effectiveness of the artificial materialmin,fmax]In this example, full band test is performed, fmin＝10kHz，fmax40GHz, i.e. frequency range for artificial material shielding effectiveness test [10kHz,40GHz ]]Setting the output signal frequency of the continuous wave seed signal source 3 to be fcw[i]，fcw[i]∈[fmin,fmax]I is 0,1,2 …, and fcw[0]＝fmin10 kHz; setting the output signal frequency of the strong field excitation seed signal source 2 as fhp[i]And f ishp[i]The following relationship is satisfied:
meanwhile, the center frequency of the stop band of the high-power filter module 12 is set to be fhp[i]In this embodiment, 1.5GHz and a stop band width W of 200MHz are adopted, which satisfy
step 6, acquiring the frequency f through the signal acquisition module 13cw[i]Amplitude of time-transmitted electromagnetic signal A [ i ]]；
Step 7, setting the output signal frequency of the continuous wave seed signal source 3 as the next test frequency fcw[i+1]If:
fcw[i+1]∈[1.4,1.6](GHz)
the frequency f of the high field excitation seed signal source 2 is sethp[i+1]Comprises the following steps:
fhp[i+1]＝1.7(GHz)
the system is adjusted to keep the size of the artificial material excitation strong field E unchanged, and meanwhile, the stop band center frequency of the high-power filter module 12 is set to be fhp[i+1]＝1.7GHz；
Otherwise, setting the frequency f of the strong field excitation seed signal source 2hp[i+1]Comprises the following steps:
fhp[i+1]＝1.5(GHz)
meanwhile, the center frequency of the stop band of the high-power filter module 12 is set to be 1.5 GHz;
A＝{Ai|i＝0,1,2,…}
step 9, setting the artificial material testing window 10 to be in a loading state, namely, artificial materials exist; repeating the step 4 to the step 7 to obtain a transmission electromagnetic signal amplitude set B of the artificial material in the range of the test frequency [10kHz,40GHz ] under the condition that the excitation strong field is E:
B＝{Bi|i＝0,1,2,…}
step 10, obtaining the shielding effectiveness of the artificial material in the frequency range of [10kHz,40GHz ] under the condition that the excitation intensity field is E:
SE＝{SEi|i＝0,1,2,…}
wherein:
and 11, changing the size of the excitation strong field of the artificial material, and repeating the steps 3-10 to obtain the electromagnetic shielding effectiveness of the artificial material in the frequency ranges of the concerned excitation strong field [0,20kV/m ], [10kHz,40GHz ], so as to complete the electromagnetic shielding effectiveness test of the artificial material in the frequency ranges of [10kHz,40GHz ] under different excitation strong fields.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A shielding effectiveness test system suitable for testing electromagnetic protection performance of artificial materials is characterized by comprising a synchronous controller, a strong field excitation seed signal source, a continuous wave seed signal source, a strong electromagnetic pulse source, a first transmitting antenna, a preposed power amplifier, a circulator, a second transmitting antenna, a shielding camera bellows, a receiving antenna, a high-power filtering module and a signal acquisition module;
the synchronous controller is respectively connected with the strong field excitation seed signal source, the continuous wave seed signal source and the strong electromagnetic pulse source; the strong field excitation seed signal source, the strong electromagnetic pulse source and the transmitting antenna I are sequentially connected; the continuous wave seed signal source, the preposed power amplifier, the circulator and the transmitting antenna II are sequentially connected; the receiving antenna, the high-power filtering module and the signal acquisition module are sequentially connected; the shielding camera bellows is provided with an artificial material testing window; the receiving antenna is arranged in the shielding camera bellows and is opposite to the center of the artificial material testing window of the shielding camera bellows; the first transmitting antenna and the second transmitting antenna are both arranged outside the shielding dark box; the first transmitting antenna is obliquely opposite to the center of the artificial material testing window of the shielding camera bellows, and the second transmitting antenna is opposite to the center of the artificial material testing window of the shielding camera bellows;
the synchronous controller comprises a plurality of independent trigger pulse generating ports and is used for generating a plurality of paths of independent time sequence trigger pulses and triggering the strong field excitation seed signal source, the continuous wave seed signal source and the strong electromagnetic pulse source to work through the time sequence trigger pulses;
the strong field excitation seed signal source is used for generating a strong field excitation seed signal according to the set working parameters under the control of the synchronous controller;
the continuous wave seed signal source is used for generating a continuous wave seed signal according to the set working parameters under the control of the synchronous controller;
the strong electromagnetic pulse source is used for amplifying the strong field excitation seed signal under the control of the synchronous controller to generate a strong field excitation signal;
the first transmitting antenna is used for radiating a strong field excitation signal;
the preposed power amplifier is used for amplifying the continuous wave seed signal and generating a continuous wave signal for testing the shielding effectiveness of the artificial material;
the circulator is used for realizing the unidirectional transmission of the continuous wave signal from the front power amplifier to the second transmitting antenna;
the second transmitting antenna is used for radiating continuous wave signals;
the receiving antenna is used for receiving the electromagnetic signals transmitted by the shielding camera bellows under the condition that the artificial materials exist or do not exist on the artificial material testing window;
the high-power filtering module is used for filtering out a strong field excitation signal in the electromagnetic signal received by the receiving antenna;
the signal acquisition module is used for acquiring and recording the electromagnetic signals filtered by the high-power filtering module.
2. The shielding effectiveness testing system suitable for the electromagnetic protection performance test of the artificial material according to claim 1, wherein the maximum output power P of the strong electromagnetic pulse source, the gain G of the first transmitting antenna, and the included angle α between the radiation direction of the first transmitting antenna and the normal direction of the artificial material testing window of the shielding dark box satisfy the following conditions:
wherein d is the distance between the center of one facet of the transmitting antenna and the center of the artificial material test window of the shielding dark box, EnThe electric field intensity required for exciting the nonlinear conductive characteristic of the artificial material is L, and the dimension of the artificial material test window of the shielding dark box is L.
3. The system of claim 1, wherein the window for testing the electromagnetic shielding performance of the shielding camera is located in a 3dB uniform region of the first transmitting antenna.
4. The shielding effectiveness testing system suitable for the electromagnetic protection performance test of the artificial material as claimed in claim 1, wherein the high-power filtering module is a band-stop filter.
5. Artificial material according to claim 4, suitable for use in materials of artificial originThe shielding effectiveness test system for testing the electromagnetic protection performance is characterized in that the stop band bandwidth W of the band elimination filter and the strong field excitation signal pulse width TwSatisfies the relationship:
6. the shielding effectiveness testing system suitable for the electromagnetic protection performance test of the artificial material as claimed in claim 1, wherein the signal acquisition module is a spectrum analyzer.
7. A shielding effectiveness testing method suitable for electromagnetic protection performance testing of artificial materials is characterized by comprising the following steps:
step 1, laying a shielding effectiveness testing system suitable for testing the electromagnetic protection performance of the artificial material according to any one of claims 1 to 6 on a test field;
step 2, the strong electromagnetic pulse source output power, the gain G of the transmitting antenna, the distance d between the center of one facet of the transmitting antenna and the center of the artificial material testing window of the shielding dark box and the included angle alpha between the radiation direction of the transmitting antenna and the normal direction of the artificial material testing window of the shielding dark box are cooperatively adjusted to enable the strong excitation field E of the artificial material to be in the range of 0 and Emax]Flexible adjustment is carried out; emaxRepresents the excitation intensity field maximum of interest;
step 3, setting the artificial material testing window to be in an idle state, namely, no artificial material exists;
step 4, testing the frequency range [ f ] according to the shielding effectiveness of the artificial materialmin,fmax]Setting the output signal frequency of the continuous wave seed signal source to be fcw[i]，fcw[i]∈[fmin,fmax]I is 0,1,2 …, and fcw[0]＝fmin(ii) a Setting the output signal frequency of the strong field excitation seed signal source as fhp[i]And f ishp[i]The following relationship is satisfied:
meanwhile, the center frequency of a stop band of the high-power filter module is set to be fhp[i]The stop band width W satisfies
Step 5, setting a synchronous controller to generate a time sequence trigger pulse, and triggering a strong field excitation seed signal source, a continuous wave seed signal source and a strong electromagnetic pulse source to work through the time sequence trigger pulse;
step 6, acquiring the frequency f through a signal acquisition modulecw[i]Amplitude of time-transmitted electromagnetic signal A [ i ]]；
Step 7, setting the output signal frequency of the continuous wave seed signal source as the next test frequency fcw[i+1]If:
then the frequency f of the strong field excitation seed signal source is sethp[i+1]Comprises the following steps:
adjusting the system to keep the size of the artificial material excitation strong field E unchanged, and setting the center frequency of the stop band of the high-power filter module to be fhp[i+1]；
Otherwise, setting the frequency f of the strong field excitation seed signal sourcehp[i+1]Comprises the following steps:
fhp[i+1]＝fhp[i]
meanwhile, the center frequency of a stop band of the high-power filter module is set to be fhp[i+1]；
Step 8, repeating the step 5 to the step 7, and obtaining the test frequency [ f ] under the conditions that the artificial material test window of the shielding dark box is not loaded with the artificial material and the excitation strong field is Emin,fmax]Set of transmission electromagnetic signal amplitudes within range a:
A＝{Ai|i＝0,1,2,…}
step 9, setting the artificial material testing window to be in a loading state, namely, artificial materials exist; repeating the step 4 to the step 7 to obtain the artificial material, and testing the frequency [ f ] under the condition that the excitation intensity field is Emin,fmax]Set of transmission electromagnetic signal amplitudes within range B:
B＝{Bi|i＝0,1,2,…}
step 10, obtaining the artificial material in the condition that the excitation intensity field is Emin,fmax]Shielding effectiveness in the frequency range:
SE＝{SEi|i＝0,1,2,…}
wherein:
step 11, changing the size of the excitation intensity field of the artificial material, and repeating the steps 3-10 to obtain the excitation intensity field [0, E ] concernedmax]、[fmin,fmax]Electromagnetic shielding effect of artificial material in frequency range, and completing the artificial material under different excitation fieldmin,fmax]And testing the electromagnetic shielding effectiveness in the frequency range.
8. The method as claimed in claim 7, wherein f is the frequency band of the full band test in step 4min＝10kHz，fmax＝40GHz。
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