CN113484633B - Shielding efficiency test system and method suitable for electromagnetic shielding performance test of artificial material - Google Patents
Shielding efficiency test system and method suitable for electromagnetic shielding performance test of artificial material Download PDFInfo
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Abstract
The invention provides a shielding effectiveness test system and a shielding effectiveness test method suitable for electromagnetic protection performance test of an artificial material, wherein in the system, a synchronous controller is respectively connected with a strong 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 first transmitting antenna are sequentially connected; the continuous wave seed signal source, the prepositive 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 connected in sequence; the shielding camera bellows is provided with an artificial material test window; the receiving antenna is arranged in the shielding camera bellows; the first transmitting antenna and the second transmitting antenna are both arranged outside the shielding camera bellows. The invention can realize the electromagnetic shielding effectiveness test of the artificial material under the excitation of different strong electromagnetic pulse environments, and effectively solves the problem that the electromagnetic shielding performance of the artificial material is difficult to effectively test.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding effectiveness test, in particular to a shielding effectiveness test system and method suitable for electromagnetic shielding effectiveness test of artificial materials.
Background
In recent years, with the rapid development of pulse power technology and high-power microwave technology, strong electromagnetic pulse threat becomes more and more realistic, and great threat is caused to the viability of electronic systems, so that research on protection reinforcement technology is urgently needed. The strong electromagnetic pulse is mainly coupled into the electronic system through a front door and a back door, so that the normal work of the electronic system is influenced, and the protection and reinforcement of the front door and the back 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 intensity 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 intensity exceeds a certain limit value, the nonlinear conductive characteristic of the artificial electromagnetic protection material is excited, and the material is in a conductive state, so that the incident electromagnetic wave can be attenuated rapidly, and an electronic system is protected effectively.
For electromagnetic shielding materials, accurately characterizing and testing their shielding effectiveness is critical to their practical shielding applications. At present, a series of testing methods are developed by students at home and abroad aiming at the shielding effectiveness test of electromagnetic protection materials. Generally, two types of loading based on transmission lines and free space loading can be largely classified; 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 medium lens focusing method and a cavity (baffle) windowing method. In these methods, a continuous wave signal source is generally used as a transmitting source, and the shielding effectiveness of the signal is obtained by comparing and calculating the received signal under the condition of the presence or absence of electromagnetic protection materials, so that the shielding effectiveness test of the material under the excitation of a strong field is very difficult to realize. For the artificial electromagnetic protection material, as the nonlinear conductive characteristic of the artificial electromagnetic protection material only appears under the excitation of a strong field, the electromagnetic shielding effectiveness of the artificial electromagnetic protection material has a strong dependence on the field intensity of the external excitation strong field; therefore, the test system and the test method formed at present are difficult to meet the test requirement of the shielding effectiveness of the artificial electromagnetic protection material. Therefore, a shielding effectiveness test system and a shielding effectiveness test method suitable for testing the electromagnetic shielding effectiveness of the artificial material are developed, the electromagnetic shielding effectiveness test of the artificial material is developed, the electromagnetic shielding ability of the artificial material is objectively evaluated, and the shielding effectiveness test system and the shielding effectiveness test method have important significance for electromagnetic shielding application of the artificial material and improvement of the survivability of an electronic system in a complex electromagnetic environment, particularly in a strong electromagnetic environment.
Disclosure of Invention
The invention aims to provide a shielding effectiveness test system and method suitable for testing electromagnetic protection performance of an artificial material, so as to solve the problem that the existing test system and test method are difficult to meet the shielding effectiveness test requirement of the artificial electromagnetic protection material.
The invention provides a shielding effectiveness test system suitable for electromagnetic protection performance test 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 front 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 first transmitting antenna is connected with the first transmitting antenna;
the synchronous controller is respectively connected with a strong 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 first transmitting antenna are sequentially connected; the continuous wave seed signal source, the prepositive 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 connected in sequence; the shielding camera bellows is provided with an artificial material test 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 camera bellows; 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 generation ports, is used for generating a plurality of independent time sequence trigger pulses, and triggers 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 pulses;
the high-field excitation seed signal source is used for generating a high-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 pre-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 unidirectional transmission of continuous wave signals 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 electromagnetic signals transmitted under the condition that artificial materials exist or do not exist on the artificial material testing window of the shielding camera bellows;
the high-power filtering module is used for filtering strong field excitation signals in electromagnetic signals received by the receiving antenna;
the signal acquisition module is used for acquiring and recording 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 α between the radiation direction of the first transmitting antenna and the normal direction of the artificial material testing window of the shielding camera bellows satisfy the following conditions:
wherein d is the distance between the center of a port surface of the transmitting antenna and the center of an artificial material testing window of the shielding camera bellows, E n The electric field intensity required by the excitation of the nonlinear conductive characteristic of the artificial material is L, which is the size of an artificial material test window of the shielding camera bellows.
Preferably, the artificial material test window of the shielding camera bellows is required to be arranged in the 3dB uniform area of the first transmitting antenna.
Preferably, the high-power filtering module is a band-stop filter.
Further, the stop band bandwidth W of the band-stop filter and the pulse width T of the strong field excitation signal w The following relationships are satisfied:
preferably, the signal acquisition module is a spectrum analyzer.
The invention also provides a shielding effectiveness test method suitable for testing the electromagnetic protection performance of the artificial material, which comprises the following steps:
step 1, arranging the shielding effectiveness test system suitable for electromagnetic protection performance test of the artificial material on a test field;
step 2, the artificial material excitation strong field E is enabled to be in [0, E ] by cooperatively adjusting the output power of the strong electromagnetic pulse source, the gain G of the transmitting antenna, the distance d between the center of the opening surface of the transmitting antenna and the center of the artificial material test window of the shielding camera bellows, and the included angle alpha between the radiation direction of the transmitting antenna and the normal direction of the artificial material test window of the shielding camera bellows max ]Flexible adjustment is performed; e (E) max Representing the excitation strong field maximum of interest;
step 3, setting an artificial material test 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 material min ,f max ]Setting the frequency of the output signal of the continuous wave seed signal source as f cw [i]，f cw [i]∈[f min ,f max ]I=0, 1,2 …, and f cw [0]＝f min The method comprises the steps of carrying out a first treatment on the surface of the Setting the frequency of the output signal of the strong field excitation seed signal source as f hp [i]And f hp [i]The following relationship is satisfied:
meanwhile, the stop band center frequency of the high-power filter module is set to be f hp [i]The stop band width W satisfies
step 6, through the signal acquisition moduleBlock acquisition frequency f cw [i]Amplitude ai of time-transmitted electromagnetic signal]；
Step 7, setting the output signal frequency of the continuous wave seed signal source as the next test frequency f cw [i+1]If:
setting the frequency f of the strong field excitation seed signal source hp [i+1]The method comprises the following steps:
the system is regulated to keep the size of the artificial material excitation intense field E unchanged, and meanwhile, the stop band center frequency of the high-power filter module is set to be f hp [i+1]；
Otherwise, setting the frequency f of the strong field excitation seed signal source hp [i+1]The method comprises the following steps:
f hp [i+1]＝f hp [i]
meanwhile, the stop band center frequency of the high-power filter module is set to be f hp [i+1]；
A＝{A i | i＝0,1,2,… }
step 9, setting an artificial material test window to be in a loading state, namely, artificial materials are present; repeating the steps 4-7 to obtain the test frequency f of the artificial material under the condition that the excitation strong field is E min ,f max ]Amplitude set B of transmitted electromagnetic signals in range:
B＝{B i | i＝0,1,2,… }
step 10, under the condition that the excitation strong field is E, the artificial material is obtained in [ f min ,f max ]Masking in a frequency rangeEfficacy:
SE＝{SE i | i＝0,1,2,… }
wherein:
In particular, f in step 4 when full band testing is performed min ＝10kHz，f max ＝40GHz。
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the shielding effectiveness test system and the shielding effectiveness test method suitable for the electromagnetic protection performance test of the artificial material can realize the electromagnetic shielding effectiveness test 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 test system and method for the electromagnetic protection performance test of the artificial material provided by the invention 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 following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a shielding effectiveness test system suitable for electromagnetic shielding performance test of an artificial material according to an embodiment of the present invention.
Fig. 2 is a flowchart of a shielding effectiveness test method suitable for electromagnetic shielding performance test of an artificial material according to an embodiment of the present invention.
Icon: the device 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-front power amplifier, a 7-circulator, an 8-transmitting antenna II, a 9-shielding camera bellows, a 10-artificial material test window, an 11-receiving antenna, a 12-high power filtering module and a 13-signal acquisition module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, the present embodiment provides a shielding effectiveness test system suitable for electromagnetic protection performance test 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 camera bellows 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 first transmitting antenna 5 are sequentially connected; the continuous wave seed signal source 3, the prepositive power amplifier 6, the circulator 7 and the transmitting antenna II 8 are sequentially connected; the receiving antenna 11, the high-power filtering module 12 and the signal acquisition module 13 are connected in sequence; the shielding camera bellows 9 is provided with an artificial material test 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 camera bellows 9; the first transmitting antenna 5 is obliquely opposite to the center of the artificial material testing window 10 of the shielding camera bellows 9, and the second transmitting antenna 8 is opposite to the center of the artificial material testing window 10 of the shielding camera bellows 9;
the synchronous controller 1 comprises 3 independent trigger pulse generation ports, is used for generating 3 paths of independent time sequence trigger pulses, and triggers 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 strong field excitation seed signal is a specified narrow-band high-power microwave seed signal, and the model number of the strong field excitation seed signal source 2 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 3 of the continuous wave seed signal source 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 1.5GHz, pulse width 50 ns);
the first transmitting antenna 5 is used for radiating a strong field excitation signal, namely a narrow-band high-power microwave signal;
the pre-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 unidirectional transmission of the continuous wave signal from the front power amplifier 6 to the transmitting antenna II 8;
the second transmitting antenna 8 is used for radiating continuous wave signals;
the receiving antenna 11 is used for receiving electromagnetic signals transmitted under the condition that artificial materials exist or do not exist on the artificial material testing window 10 of the shielding camera bellows 9;
the high-power filtering module 12 is configured to filter out 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 (may be 0.8 MW) of the strong electromagnetic pulse source 4, the gain G of the first transmitting antenna 5, and the included angle α between the radiation direction of the first transmitting antenna 5 and the normal direction of the artificial material testing window 10 of the shielding camera bellows 9 satisfy the following conditions:
wherein d is the distance between the center of the opening 5 of the transmitting antenna and the center of the artificial material testing window 10 of the shielding camera bellows 9, E n The electric field intensity required by the excitation of the nonlinear conductive characteristic of the artificial material is L, which is the size (which may be 0.6 m) of an artificial material test window 10 of the shielding camera bellows 9.
Further, the artificial material test window 10 of the shielding camera bellows 9 needs to be disposed in the 3dB uniform area of the first transmitting antenna 5.
Further, the high-power filtering module 12 is a band-stop filter. The stop band bandwidth W of the band stop filter can be 200MHz, which is equal to the pulse width T of the strong field excitation signal w The following are satisfied:
with the above shielding effectiveness testing system suitable for electromagnetic protection performance testing of an artificial material, this embodiment also provides a shielding effectiveness testing method suitable for electromagnetic protection performance testing of an artificial material, as shown in fig. 2, including the following steps:
step 1, arranging the shielding effectiveness test system suitable for electromagnetic protection performance test of the artificial material on a test field;
step 2, the artificial material excitation strong field E is enabled to be in [0, E ] by cooperatively adjusting the output power of the strong electromagnetic pulse source 4, the gain G of the first 5 opening surface of the transmitting antenna, the distance d between the center of the first 5 opening surface of the transmitting antenna and the center of the artificial material test window 10 of the shielding camera bellows 9 and the included angle alpha between the radiation direction of the first 5 opening surface of the transmitting antenna and the normal direction of the artificial material test window 10 of the shielding camera bellows 9 max ]Flexible adjustment is performed; e (E) max Representing the excitation strong field maximum of interest; the range of the excitation strong field is [0,20kV/m ]]I.e. E max ＝20kV/m；
Step 3, setting an artificial material test 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 material min ,f max ]In this embodiment, full-band test is performed, f min ＝10kHz，f max =40 GHz, i.e. artificial material shielding effectiveness test frequency range [10khz,40GHz]Setting the frequency of the output signal of the continuous wave seed signal source 3 as f cw [i]，f cw [i]∈[f min ,f max ]I=0, 1,2 …, and f cw [0]＝f min =10khz; setting the frequency of the output signal of the strong field excitation seed signal source 2 as f hp [i]And f hp [i]The following relationship is satisfied:
meanwhile, the stop band center frequency of the high-power filter module 12 is set to be f hp [i]In this embodiment, 1.5GHz is adopted, and the stop band width W is 200MHz, which satisfies the requirement
step 6, obtaining the frequency f through the signal acquisition module 13 cw [i]Amplitude ai of time-transmitted electromagnetic signal]；
Step 7, setting the output signal frequency of the continuous wave seed signal source 3 as the next test frequency f cw [i+1]If:
f cw [i+1]∈[1.4,1.6](GHz)
then the frequency f of the strong field excitation seed signal source 2 is set hp [i+1]The method comprises the following steps:
f hp [i+1]＝1.7(GHz)
and the system is regulated to keep the intensity of the artificial material excitation intense field E unchanged, and meanwhile, the stop band center frequency of the high-power filter module 12 is set to be f hp [i+1]＝1.7GHz；
Otherwise, setting the frequency f of the strong field excitation seed signal source 2 hp [i+1]The method comprises the following steps:
f hp [i+1]＝1.5(GHz)
meanwhile, the stop band center frequency of the high-power filter module 12 is set to be 1.5GHz;
A＝{A i | i＝0,1,2,… }
step 9, setting an artificial material test window 10 to be in a loading state, namely, artificial materials are present; repeating the steps 4 to 7 to obtain a transmission electromagnetic signal amplitude set B of the artificial material within the test frequency [10kHz,40GHz ] range under the condition that the excitation strong field is E:
B＝{B i | i＝0,1,2,… }
step 10, under the condition that the excitation strong field is E, the shielding effectiveness of the artificial material in the frequency range of [10kHz,40GHz ] is obtained:
SE＝{SE i | i＝0,1,2,… }
wherein:
and 11, changing the excitation strong field size of the artificial material, and repeating the steps 3-10 to obtain the electromagnetic shielding effectiveness of the artificial material in the frequency range of the concerned excitation strong field [0,20kV/m ], [10kHz,40GHz ], thereby completing the electromagnetic shielding effectiveness test of the artificial material in the frequency range of [10kHz,40GHz ] under different excitation strong fields.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The shielding effectiveness test system suitable for the electromagnetic protection performance test of the artificial material 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 front 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 a strong 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 first transmitting antenna are sequentially connected; the continuous wave seed signal source, the prepositive 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 connected in sequence; the shielding camera bellows is provided with an artificial material test 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 camera bellows; 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 generation ports, is used for generating a plurality of independent time sequence trigger pulses, and triggers 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 pulses;
the high-field excitation seed signal source is used for generating a high-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 pre-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 unidirectional transmission of continuous wave signals 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 electromagnetic signals transmitted under the condition that artificial materials exist or do not exist on the artificial material testing window of the shielding camera bellows;
the high-power filtering module is used for filtering strong field excitation signals in electromagnetic signals received by the receiving antenna;
the signal acquisition module is used for acquiring and recording electromagnetic signals filtered by the high-power filtering module;
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 testing window of the shielding camera bellows meet the following conditions:
wherein d is the distance between the center of a port surface of the transmitting antenna and the center of an artificial material testing window of the shielding camera bellows, E n The electric field intensity required by the excitation of the nonlinear conductive characteristic of the artificial material is L, which is the size of an artificial material test window of the shielding camera bellows.
2. The shielding effectiveness test system for electromagnetic shielding performance test of artificial materials according to claim 1, wherein the artificial material test window of the shielding camera bellows is required to be disposed in a 3dB uniform area of the first transmitting antenna.
3. The shielding effectiveness test system for electromagnetic shielding performance test of artificial materials according to claim 1, wherein the high-power filter module is a band-stop filter.
4. The shielding effectiveness test system for electromagnetic shielding performance test of artificial materials according to claim 3, wherein the stopband bandwidth W of the bandstop filter and the pulse width T of the strong field excitation signal w The following relationships are satisfied:
5. the shielding effectiveness test system for electromagnetic shielding performance test of an artificial material according to claim 1, wherein the signal acquisition module is a spectrum analyzer.
6. The shielding effectiveness test method suitable for the electromagnetic protection performance test of the artificial material is characterized by comprising the following steps of:
step 1, arranging the shielding effectiveness test system suitable for electromagnetic protection performance test of artificial materials according to any one of claims 1-5 on a test site;
step 2, the artificial material excitation strong field E is enabled to be in [0, E ] by cooperatively adjusting the output power of the strong electromagnetic pulse source, the gain G of the transmitting antenna, the distance d between the center of the opening surface of the transmitting antenna and the center of the artificial material test window of the shielding camera bellows, and the included angle alpha between the radiation direction of the transmitting antenna and the normal direction of the artificial material test window of the shielding camera bellows max ]Flexible adjustment is performed; e (E) max Representing the excitation strong field maximum of interest;
step 3, setting an artificial material test 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 material min ,f max ]Setting the frequency of the output signal of the continuous wave seed signal source as f cw [i]，f cw [i]∈[f min ,f max ]I=0, 1,2 …, and f cw [0]＝f min The method comprises the steps of carrying out a first treatment on the surface of the Setting the frequency of the output signal of the strong field excitation seed signal source as f hp [i]And f hp [i]The following relationship is satisfied:
meanwhile, the stop band center frequency of the high-power filter module is set to be f hp [i]The stop band width W satisfies
Step 5, setting a synchronous controller to generate time sequence trigger pulses, 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 pulses;
step 6, obtaining the frequency f through a signal acquisition module cw [i]Transmitted by electromagnetic signalsAmplitude A [ i ]]；
Step 7, setting the output signal frequency of the continuous wave seed signal source as the next test frequency f cw [i+1]If:
setting the frequency f of the strong field excitation seed signal source hp [i+1]The method comprises the following steps:
the system is regulated to keep the size of the artificial material excitation intense field E unchanged, and meanwhile, the stop band center frequency of the high-power filter module is set to be f hp [i+1]；
Otherwise, setting the frequency f of the strong field excitation seed signal source hp [i+1]The method comprises the following steps:
f hp [i+1]＝f hp [i]
meanwhile, the stop band center frequency of the high-power filter module is set to be f hp [i+1]；
Step 8, repeating the steps 5 to 7 to obtain the test frequency [ f ] under the conditions that the artificial material test window of the shielding camera bellows is not loaded with artificial materials and the excitation strong field is E min ,f max ]Amplitude set a of transmitted electromagnetic signals in range:
step 9, setting an artificial material test window to be in a loading state, namely, artificial materials are present; repeating the steps 4-7 to obtain the test frequency f of the artificial material under the condition that the excitation strong field is E min ,f max ]Amplitude set B of transmitted electromagnetic signals in range:
step 10, under the condition that the excitation strong field is E, the artificial material is obtained in [ f min ,f max ]Shielding effectiveness in the frequency range:
wherein:
step 11, changing the excitation strong field size of the artificial material, and repeating the steps 3 to 10 to obtain the concerned excitation strong field [0, E ] max ]、[f min ,f max ]The electromagnetic shielding effect of the artificial material in the frequency range is further finished, and the [ f ] of the artificial material under different excitation strong fields is further finished min ,f max ]Electromagnetic shielding effectiveness test over a range of frequencies.
7. The shielding effectiveness test method for electromagnetic shielding performance test of artificial materials according to claim 6, wherein in step 4, f is as follows when full-band test is performed min ＝10kHz，f max ＝40GHz。
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