KR101649514B1 - Electromagnetic compatibility testing apparatus - Google Patents

Electromagnetic compatibility testing apparatus Download PDF

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KR101649514B1
KR101649514B1 KR1020150056605A KR20150056605A KR101649514B1 KR 101649514 B1 KR101649514 B1 KR 101649514B1 KR 1020150056605 A KR1020150056605 A KR 1020150056605A KR 20150056605 A KR20150056605 A KR 20150056605A KR 101649514 B1 KR101649514 B1 KR 101649514B1
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South Korea
Prior art keywords
unit
test
antenna
radio wave
array antenna
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KR1020150056605A
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Korean (ko)
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최준호
신진우
염승환
소준호
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국방과학연구소
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
    • G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0878—Sensors; antennas; probes; detectors

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  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The present invention relates to an electromagnetic compatibility testing apparatus, and more particularly, to a testing apparatus for testing electromagnetic compatibility of a test object, comprising: an array antenna including at least two or more unit antennas arranged; A radiation controller for controlling a phase of each of the unit antennas so that a test radio wave concentrated at a predetermined point is emitted from the array antenna; And a monitoring unit for monitoring a reaction of the test subject due to the test radio wave. Accordingly, the size and weight of the antenna for transmitting radio waves can be greatly reduced, and electric field measurement through the field probe is not performed, so that the test can be performed economically.

Description

[0001] ELECTROMAGNETIC COMPATIBILITY TESTING APPARATUS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an electromagnetic compatibility testing apparatus, and more particularly, to a testing apparatus that performs safety evaluation of various apparatuses against an external propagation environment.

Electromagnetic Compatibility (EMC) refers to a state in which systems, equipment, and components operate normally in an electromagnetic environment. It minimizes unnecessary electromagnetic radiation from electrical and electronic equipment and prevents interference from external electromagnetic environment. It is necessary to have electromagnetic wave immunity to operate normally.

As various electric and electronic equipments are miniaturized, many low-power and high-speed devices are used, and these devices are likely to cause serious trouble due to electromagnetic waves, and thus electromagnetic compatibility is becoming increasingly important. Reflecting this situation, electromagnetic compatibility tests have been carried out in a variety of fields ranging from semiconductors, home electronic devices to automobiles, aircraft, medical, communication, and military equipment, and various standards and specifications have been prepared for them.

A test to evaluate electromagnetic compatibility is a radiated emission test that measures the magnitude of interferences radiated from electronic equipment to the outside and the immunity to performance that is required when electronic equipment is exposed to high field strength environments There is a radiated susceptibility test.

Among them, the radiation immunity test was conducted to prevent radio interference caused by the strong electric field generated during the test, to form a uniform electric field in the area where the equipment under test (EUT) is placed, It is performed in the anechoic chamber, radiates the generated signal to the EUT through the antenna, and monitors the operation state of the EUT by the signal to evaluate the immunity performance.

As described above, since a strong electric field is generated in the radiation immunity test, a high output signal source such as a vacuum tube and a high gain antenna are required. This increases the cost of implementing the test apparatus and increases the weight and size of the antenna. Particularly, since medical, automobile, and military equipment require a stronger electric field, the size of the antenna also increases in proportion to this, so that the above problems are more conspicuous. On the other hand, even when a low-power signal source is used, a large reflector for focusing the signal needs to be separately provided.

In addition, since it is not possible to predict the field strength in the near field, field strength measurement is performed through a plurality of field probes in the conventional radiation immunity test. As a result, there is a problem that time and cost are also required to measure the electric field intensity.

Therefore, it is necessary to design an advanced electromagnetic compatibility testing apparatus which can reduce the time and cost required for the test and the size of the equipment used in the test while ensuring the reliability of the conventional radiation immunity test.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems, and it is an object of the present invention to provide an electromagnetic compatibility testing apparatus which can reduce the weight and volume of a test equipment while maintaining reliability as a result of a conventional radiation immunity test, .

The above object is achieved by a testing apparatus for testing electromagnetic compatibility of a test object according to an aspect of the present invention, comprising: an array antenna including at least two or more unit antennas arranged; A radiation controller for controlling a phase of each of the unit antennas so that a test radio wave concentrated at a predetermined point is emitted from the array antenna; And a monitoring unit for monitoring a response of the test object due to the test radio wave.

The radiation controller may calculate an input phase to be fed to each of the unit antennas on the basis of a distance between each of the unit antennas and the predetermined point. In this case, the radiation controller may control the unit antennas, So that the input phase can be calculated.

Also, the radiation control unit may control the beam width of the test radio wave in consideration of the size of the test object and the required electric field intensity, and may perform beam steering through the phase adjustment of the unit antennas, The test may be carried out on the test device.

In addition, the emission control unit may control the sequentially changing intensity of the test radio wave and the frequency band so that the test is performed in various test environments and conditions.

On the other hand, based on at least any one of the radiation pattern of the unit antenna, the intensity of the power inputted to the unit antenna, and the distance between the unit antenna and the unit area of the plane including the point, and an electric field calculation unit for calculating an array factor, calculating an electric field strength based on the array coefficient, and feeding back the information about the radio wave for test to the emission control unit.

The apparatus may further include a rotation table for rotating the test object in accordance with the monitoring progress of the monitoring unit, in order to increase the convenience of the test. For example, a rail may be extended from the array antenna along one direction, and the rotary table may be configured to be movable on the rail so that the distance between the test object and the array antenna can be adjusted.

As described above, according to the present invention, the size and weight of the antenna for transmitting radio waves can be greatly reduced, and electric field measurement through the field probe is not performed, so that the test can be performed economically.

Further, according to the present invention, antenna height and angle adjustment through conventional mechanical mechanisms can be achieved through electronic beam steering, thereby enhancing test convenience.

1 is a schematic configuration diagram of an electromagnetic compatibility testing apparatus according to an embodiment of the present invention;
FIG. 2 is a reference diagram for explaining an example of calculating an antenna array coefficient; FIG. And
3 is a graph showing a power density variation according to a distance between an array antenna and a target point.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

1 is a schematic configuration diagram of an electromagnetic compatibility testing apparatus according to an embodiment of the present invention. 1, an electromagnetic compatibility testing apparatus according to an embodiment of the present invention includes an array antenna 10, a radiation control unit 20, an electric field calculation unit 30, a monitoring unit 40, and a rotary table 50 And shall be placed on an outdoor test site or electromagnetic anechoic chamber prepared for electromagnetic compatibility testing.

The array antenna 10 is for radiating a test radio wave to an electromagnetic compatibility test object (EUT). A plurality of unit antennas 1 are arranged at a predetermined interval in a matrix form. A dipole, Slots, micro strip patches, and the like can be applied. The array antenna 10 may be implemented in various sizes considering the antenna gain and the frequency band required for the test.

The array antenna 10 includes a power amplifier for amplifying the output, a phase shifter for adjusting the phase of the unit antenna 1, and the like.

The radiation control unit 20 adjusts the input phase of each unit antenna 1 so that the array antenna 10 concentrates and emits the beam to a predetermined target point P. [ For reference, the target point P is a point where the beam emitted from the array antenna 10 is concentrated. If the irradiated beam can be irradiated to the test object EUT on the electromagnetic compatibility test object EUT, EUT) may be determined as the target point P. The position of the target point P is selected in consideration of the size of the test object (EUT), the test region, the beam width of the array antenna 10, the required electric field intensity, and the like.

The radiation control unit 20 calculates an input phase to be fed to each unit antenna 1 based on the distance between each unit antenna 1 and the target point P of the array antenna 10, And controls the array antenna 10 based on the received signal.

In this manner, the radiation control unit 20 adjusts the phase of each unit antenna 1 so as to concentrate the beam at the target point P by making the constructive interference in the specific direction and destructive interference in the other direction.

An example in which the radiation control unit 20 calculates the input phase of each unit antenna 1 can be expressed as the following equation.

Figure 112015039191205-pat00001

Figure 112015039191205-pat00002

Assuming that the unit antennas 1 of the array antenna 10 are arranged in m rows and n columns,

Figure 112015039191205-pat00003
The distance between each unit antenna 1 and the target point P,
Figure 112015039191205-pat00004
The center wavelength,
Figure 112015039191205-pat00005
A parameter relating to the temporal delay of the waveform generated by the difference in distance between each unit antenna 1 and the target point P,
Figure 112015039191205-pat00006
Is the input phase of each unit antenna 1, and
Figure 112015039191205-pat00007
Means the number of propagation waves.

The radiation control unit 20 calculates the input phase based on the distance between each unit antenna 1 and the target point P and calculates the input phase based on the distance between the unit antenna 1 and the target point P 1) and the target point (P). According to the above formula, the closer the distance between each unit antenna 1 and the target point P is, the larger the phase difference between adjacent unit antennas 1 becomes.

The radiation control unit 20 can control the beam width of the test radio wave radiated from the array antenna 10 in consideration of the size of the test object EUT and the electric field intensity required for the test. That is, when the test radio wave is to be irradiated with a wide beam width, as in the case where the size of the test object (EUT) is large, or vice versa, when the number of the unit antennas (1) It is possible to control the width of the beam width of the test radio wave through the control of the power transmitted to the unit antenna 1. At this time, it is necessary to consider the electric field intensity required for the test in consideration of the power loss caused in the process of adjusting the beam width.

Since the electromagnetic compatibility test needs to be performed at various points and in various directions according to the characteristics and usage of the test object (EUT), the radiation control unit 20 performs beam steering through the phase adjustment of each unit antenna 1 So that the test radio wave is radiated to various target points (P) so that the test can be performed on various surfaces of the test object (EUT) in various directions.

Electromagnetic compatibility test should be performed in the uniform electric field area, and it is necessary to grasp current electric field intensity in the test process. However, according to the embodiment of the present invention, the field intensity is measured using a plurality of field probes, including the electric field calculation unit 30, The electric field intensity can be predicted through calculation.

The electric field calculator 30 calculates the electric field of the unit antenna 1 based on the radiation pattern of the unit antenna 1, the intensity of the electric power inputted to the unit antenna 1, the distance between the unit areas of the plane including the unit antenna 1 and the target point P An array factor (AF) of the array antenna 10 is calculated on the basis of any one of the elements, the electric field strength is calculated based on the array factor, and the information about the test radio wave is fed back to the radiation controller 20.

Fig. 2 is a reference diagram for explaining an example in which array coefficients are calculated through the electric field calculation unit 30. Fig. Referring to FIG. 2, the electric field calculation unit 30 can calculate the array coefficient AF through the following equation.

Figure 112015039191205-pat00008

In the above formula,

Figure 112015039191205-pat00009
The intensity of the power input to each unit antenna 1,
Figure 112015039191205-pat00010
A function representing the radiation pattern of the unit antenna 1,
Figure 112015039191205-pat00011
Is the propagation constant,
Figure 112015039191205-pat00012
The distance between the unit antennas 1,
Figure 112015039191205-pat00013
The input phase of each unit antenna 1,
Figure 112015039191205-pat00014
The center wavelength,
Figure 112015039191205-pat00015
Means a distance between planar unit areas including each unit antenna 1 and a target point P, respectively.

The electric field calculation unit 30 calculates an antenna gain and an electric field intensity using the array coefficient calculated as described above, and feeds back the calculated antenna gain and electric field intensity to the radiation control unit 20. The radiation controller 20 controls the array antenna 10 based on the fed back information to adjust the strength, beam direction, beam width, and the like of the radiated test radio wave.

The monitoring unit 40 monitors the response of the test object (EUT) due to the test radio wave radiated from the array antenna 10. The monitoring unit 40 can check whether the normal operation is performed by extracting a response characteristic curve from the test object (EUT).

The monitoring unit 40 records the test progress so that the test is performed on all frequency bands and field strengths required for the test. The radiation control unit 20 sequentially changes the intensity and frequency band of the test radio wave based on the recorded test progress information of the monitoring unit 40 so that the test can be performed in all the environments and conditions to be tested.

Meanwhile, the electromagnetic compatibility testing apparatus according to the embodiment of the present invention may further include a turn table 50 for rotating the test object (EUT). It is necessary to scan the entire surface according to the test object EUT. Therefore, the test object EUT is automatically or remotely controlled in accordance with the test progress of the monitoring unit 40, So that the test can be performed.

3 is a graph showing a change in power density according to a distance d between the array antenna 10 and the target point P. In FIG. Referring to FIG. 3, it can be seen that as the distance d increases, the region where energy is concentrated becomes wider. According to this, it can be expected that this can be achieved by increasing the distance between the array antenna 10 and the target point P when a test radio wave should be radiated over a wider area due to the size of the test object EUT .

In consideration of this, the rotary table 50 can be moved not only in the rotation direction but also in the horizontal direction, so that the horizontal distance between the array antenna 10 and the test object EUT can be adjusted automatically or remotely have. For example, a rail (not shown) extending along one direction from the array antenna 10 is provided on the bottom of the electromagnetic anechoic chamber, and a rotary table 50 is configured to be movable along the rail, Can be made to approach or move away from the array antenna 10.

As described above, in the electromagnetic compatibility testing apparatus according to the present invention, by adopting the array antenna 10 while eliminating a large-size antenna for achieving high gain, it is possible to economically realize a device with a small antenna The complex mechanical mechanism for adjusting the height and the angle of the antenna, and the field probe for measuring the electric field strength can be omitted, thereby achieving the convenience of testing and economical efficiency.

Although some embodiments of the present invention have been described above, those skilled in the art will appreciate that various modifications may be made without departing from the spirit of the present invention.

Therefore, it is to be understood that the embodiments of the present invention are by way of example only and that the technical spirit of the present invention is defined from the claims, and that the scope of the present invention is applied to equivalents.

10: array antenna 20: radiation control unit
30: electric field calculation unit 40: monitoring unit
50: Rotating table

Claims (9)

A test apparatus for testing electromagnetic compatibility of a test object,
An array antenna in which at least two or more unit antennas are arranged;
A radiation controller for controlling a phase of each of the unit antennas so that a test radio wave concentrated at a predetermined point is emitted from the array antenna;
A monitoring unit for monitoring a reaction of the test subject due to the test radio wave; And
And an array coefficient of the array antenna based on at least any one of a radiation pattern of the unit antenna, an intensity of power input to the unit antenna, and a distance between the unit antenna and a unit area of a plane including the point and an electric field calculation unit for calculating the electric field intensity based on the array coefficient and feeding back the information about the test radio wave to the radiation control unit,
Wherein the radiation controller controls at least one of intensity, beam direction, and beam width of a test radio wave to be radiated by controlling the array antenna based on the feedback information. The method according to claim 1,
Wherein the radiation control unit calculates an input phase to be fed to each unit antenna based on a distance between each unit antenna and the predetermined point. 3. The method of claim 2,
And the radiation control unit calculates the input phase by compensating for a waveform delay corresponding to a difference in distance between the unit antenna and the predetermined point. The method according to claim 1,
Wherein the radiation control unit controls the beam width of the test radio wave in consideration of the size of the test object and the required electric field intensity. The method according to claim 1,
And the radiation control unit performs beam steering through the phase adjustment of each of the unit antennas. The method according to claim 1,
And the radiation control unit controls the intensity and the frequency band of the test radio wave sequentially. delete The method according to claim 1,
And a rotation table for rotating the test object in accordance with the monitoring progress of the monitoring unit. 9. The method of claim 8,
Further comprising a rail extending along one direction from the array antenna,
Wherein the rotary table is movably provided on the rail so that a distance between the test object and the array antenna can be adjusted.
KR1020150056605A 2015-04-22 2015-04-22 Electromagnetic compatibility testing apparatus KR101649514B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101946720B1 (en) * 2017-08-08 2019-02-11 한국과학기술원 Full-Field MAS Scanning System and Method
KR101969146B1 (en) * 2018-09-20 2019-04-16 국방과학연구소 Apparatus and method for supporting design of electromagnetic wave absorber
KR102207103B1 (en) * 2020-07-22 2021-01-22 김대진 Apparatus for testing Electromagnetic Susceptibility
CN112904091A (en) * 2021-01-13 2021-06-04 成都四威功率电子科技有限公司 PID-based field intensity radiation automatic test system control method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1164487A (en) * 1997-08-26 1999-03-05 Nippon Denki Denpa Kiki Eng Kk Monitoring system for phased array antenna
JP2007049691A (en) * 2005-07-13 2007-02-22 Murata Mfg Co Ltd Antenna module and radio apparatus
KR101337343B1 (en) * 2012-12-18 2013-12-06 주식회사 현대케피코 Method for estimating field uniformity for electromagnetic susceptibility test
JP5678854B2 (en) * 2011-09-28 2015-03-04 株式会社デンソー Electromagnetic test equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1164487A (en) * 1997-08-26 1999-03-05 Nippon Denki Denpa Kiki Eng Kk Monitoring system for phased array antenna
JP2007049691A (en) * 2005-07-13 2007-02-22 Murata Mfg Co Ltd Antenna module and radio apparatus
JP5678854B2 (en) * 2011-09-28 2015-03-04 株式会社デンソー Electromagnetic test equipment
KR101337343B1 (en) * 2012-12-18 2013-12-06 주식회사 현대케피코 Method for estimating field uniformity for electromagnetic susceptibility test

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101946720B1 (en) * 2017-08-08 2019-02-11 한국과학기술원 Full-Field MAS Scanning System and Method
KR101969146B1 (en) * 2018-09-20 2019-04-16 국방과학연구소 Apparatus and method for supporting design of electromagnetic wave absorber
KR102207103B1 (en) * 2020-07-22 2021-01-22 김대진 Apparatus for testing Electromagnetic Susceptibility
CN112904091A (en) * 2021-01-13 2021-06-04 成都四威功率电子科技有限公司 PID-based field intensity radiation automatic test system control method
CN112904091B (en) * 2021-01-13 2023-11-21 成都四威功率电子科技有限公司 Control method of field intensity radiation automatic test system based on PID

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