KR101498153B1 - Electromagnetic measurement system with positioning part - Google Patents

Abstract

The supporting device for measuring the electromagnetic wave of the EUT according to an embodiment of the present invention includes a support for supporting the attachment and detachment of the EUT, a support shaft for supporting the rotation of the EUT attached to the EUT, And a second light source part for indicating a horizontal reference point of a receiving antenna which can be attached or fixed to the supporting part or the EUT and which receives a signal of the EUT as a light source, The apparatus rotates the EUT in horizontal and vertical directions, and the vertical light source indicated by the first light source unit and the horizontal light source indicated by the second light source unit are orthogonal.

Description

ELECTROMAGNETIC MEASUREMENT SYSTEM WITH POSITIONING PART FIELD OF THE INVENTION [0001]

The present invention relates to an electromagnetic wave measuring system.

Measurement of the degree of influence of noise or electromagnetic waves generated in electronic devices on the human body or other electronic devices is referred to as electromagnetic wave measurement or electromagnetic compatibility (EMC) testing.

As electronic devices become more and more digital and faster, the circulating currents in the circuits of electronic devices have increased, and electronic devices have become more likely to generate more noise and electromagnetic waves. For this reason, regulations are being tightened against electromagnetic noise or electromagnetic waves generated in electronic devices, and various electromagnetic measurement systems for measuring whether electronic devices satisfy such regulations are being proposed.

Among electromagnetic measurement systems, there is a system for measuring conducted noises (Conducted Emissions), and a system for measuring radiated emissions. Noises or electromagnetic waves generated in electronic devices can be propagated to other electronic devices through wired lines such as a power source. Measuring the noise propagated to other electronic devices through a wire connected to the electronic device is called conductive noise measurement. Alternatively, an electronic device can radiate noise or electromagnetic waves into the air according to the flow of electromagnetic energy in the circuit. The measurement of noise or electromagnetic waves radiated to the air is called a radio noise measurement.

Radioactive noise is received through an electromagnetic measurement antenna and propagated through a wire, and the magnitude of the electrical signal propagated through the wire is small.

On the other hand, setting the position of the EUT accurately is an important factor in the measurement of electromagnetic waves. If the position of the EUT is not correct, errors may occur in determining the measured electromagnetic wave. However, as the size and size of the EUT are small, it becomes necessary to accurately set the position of the EUT.

In view of the above, it is an object of the present invention to provide a positioning function to precisely set the position of an EUT in order to accurately analyze an electromagnetic wave transmitted from an EUT to an electromagnetic measurement antenna.

The support device for measuring the electromagnetic wave of the EUT according to an embodiment of the present invention includes a support for supporting the attachment and detachment of the EUT, a device for instructing the EUT to the light source so that the center of the EUT coincides with the rotation axis of the EUT attached to the equipment And a second light source part for indicating the horizontal reference point of the receiving antenna which is attachable or fixable to the support part or the EUT and which receives the signal of the EUT as a light source, And the vertical light source indicated by the first light source unit and the horizontal light source indicated by the second light source unit are orthogonal.

A system for measuring electromagnetic waves of an EUT according to another embodiment of the present invention, comprising: a supporting device for supporting an EUT; a light source for instructing the EUT so that the center of the EUT coincides with the rotation axis of the EUT attached to the supporting device; And a second light source unit for directing the center of the EUT to a light source at a horizontal reference point of a receiving antenna for receiving a signal of the EUT, And the light emitted from the horizontal light source indicated by the second light source unit are perpendicular to each other.

As described above, when the present invention is implemented, it is possible to precisely select the position of a wireless communication device by using a linear light source such as a laser pointer, to minimize the errors that may occur in the test, to improve the uncertainty and reproducibility of the test evaluation Can be maximized.

1 is a configuration diagram of an electromagnetic interference measuring system to which an embodiment of the present invention is to be combined.
2 is a configuration diagram of the electromagnetic interference measuring system for the communication terminal 11. As shown in Fig.
3 is a supporting device for measuring electromagnetic waves of a wireless communication device according to an embodiment of the present invention.
4 is a diagram illustrating an example of measuring electromagnetic waves of a wireless communication device according to an embodiment of the present invention.
5 is a view showing a center of an EUT according to an embodiment of the present invention, the light source being located on the upper side of the supporting device.
6 is a view showing a center of an EUT according to another embodiment of the present invention, in which a light source is positioned on a receiving antenna.
FIG. 7 is a view illustrating a first light source unit and a second light source unit according to another embodiment of the present invention mounted on the outside of a supporting apparatus. FIG.
8 is a diagram relating to measurement of the unnecessary frequency.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

What is important in the measurement of radiated electromagnetic waves in radio communication equipment is the precise distance between the EUT and the receiving antenna and the vertical and horizontal levels when forming the spherical coordinate system of the EUT. In the case of existing equipment, it is difficult to select the standard position due to the different position and shape of each equipment, so that it is difficult to implement the accurate spherical coordinate system. Therefore, it is aimed to facilitate the standard position setting using the laser pointer. Hereinafter, an embodiment of the present invention will be described with reference to the configuration of a measuring apparatus equipped with a light source unit for indicating vertical and horizontal levels.

1 is a configuration diagram of an electromagnetic interference measuring system to which an embodiment of the present invention is to be combined.

Referring to FIG. 1, an electromagnetic wave radiated from an equipment under test (EUT) 10 is received by an electromagnetic wave measuring antenna 20. The electromagnetic wave received by the electromagnetic wave measuring antenna 20 is transmitted to the analyzer 40 through the cable 30 as an electric signal. The device under test 10 and the electromagnetic measurement antenna 20 may be located within the anechoic chamber 50 and the analyzer 40 may be located outside the anechoic chamber 50. [

The device under test 10 is an electronic device that emits electromagnetic waves. All the electronic devices that emit electromagnetic waves by using electricity such as a television, an electric car, and a communication terminal can be the device under test 10.

The electromagnetic wave measuring antenna 20 receives an electromagnetic wave radiated from the device under test 10. One example of the electromagnetic measurement antenna 20 may be a directional antenna. A directional antenna may have a high reception sensitivity for one or more directions. One example of a directional antenna is a log-periodic antenna. Directional antennas can be used to measure electromagnetic waves at low frequencies, such as 30 MHz. Another example of the electromagnetic wave measuring antenna 20 is a horn antenna. The horn antenna can be used to measure high frequency electromagnetic waves of 300MHz or higher with an antenna made of a metal of a morning glory shape.

The cable 30 can be shielded to transmit an electric signal without being influenced by external electromagnetic waves. The shielded cable 30 has internal conductors for carrying electrical signals, and may have a shielding film surrounding such conductors. The shielding film may be connected to the ground if it is made of a conductive member such as a metal. The cable 30 may include an insulating film between the shielding film and the internal conductor.

The analyzer 40 analyzes the electric signal transmitted from the electromagnetic wave measuring antenna 20 and outputs the result as data or displays the result on a screen. An example of the analyzer 40 is a power meter. The power meter is a device for analyzing or measuring the value of electric energy possessed by an electric signal per hour. The tester measures a magnitude of power of an electric signal transmitted from the electromagnetic wave measuring antenna 20 through a value measured by a power meter . Another example of analyzer 40 is an oscilloscope. The oscilloscope is a device for displaying a waveform on the time axis of an electric signal, and the tester can understand the change in the time axis of the electric signal transmitted from the electromagnetic wave measuring antenna 20 through this oscilloscope.

Another example of analyzer 40 is a spectrum analyzer. The spectrum analyzer measures the magnitude of the frequency-dependent signal for the incoming electrical signal. Electronic devices may be sensitive to electromagnetic waves in a specific frequency band. For example, in the case of a communication terminal, communication disturbance may be caused when it is affected by electromagnetic waves in a frequency band used for communication. For this reason, in a system for measuring electromagnetic interference, a spectrum analyzer can be used to measure the magnitude of a frequency-dependent signal with respect to electromagnetic waves radiated from the device under test 10.

The anechoic chamber 50 is a processed room so that electromagnetic waves are not reflected, and electromagnetic waves emitted from the device under test 10 can be absorbed into the wall of the anechoic chamber 50. The wall of the anechoic chamber 50 may include an attachment capable of absorbing electromagnetic waves. Such attachments may be made up of pyramidal shaped pieces. All surfaces within the anechoic chamber 50 may include such pyramid-shaped electromagnetic wave absorbing attachments. A foamable rubber containing a mixture of carbon and iron may be used as the material of the electromagnetic wave absorbing attachment. The attachment that is contained in the wall of the anechoic chamber 50 and absorbs the electromagnetic wave is not limited to the above-described material and shape, and the electromagnetic wave absorbing attachment may be in the form of a flat tile made of ferrite.

The test subject device 10 may be a communication terminal such as a mobile phone. In the following description, the test target device 10 is a communication terminal, but the present invention is not limited thereto. All the electronic devices to be subjected to the electromagnetic interference test are the test target device 10 in the present invention .

2 is a configuration diagram of the electromagnetic interference measuring system for the communication terminal 11. As shown in Fig.

2, the electromagnetic interference measuring system for the communication terminal 11 includes a communication terminal 11 to be tested, an electromagnetic wave measuring antenna 20, a filter 60, an amplifier 70, an analyzer 40 and a table 80), and the like.

One of the characteristics of the communication terminal 11 as the device under test 10 is that the communication terminal 11 emits radio waves of a certain band for communication while the other device under test 10 intentionally radiates electromagnetic waves . The radio waves of this band emitted by the communication terminal 11 are not subjected to electromagnetic wave interference measurement. Also, since the propagation of such a band has a very strong propagation intensity, it may cause malfunction or failure of the analyzer 40 when it is directly transmitted to the analyzer 40. In order to avoid overloading and breakage of the analyzer 40, the analyzer 40 must transmit only electrical signals of a certain size or less (for example, 150 mV or less).

The filter 60 can attenuate the propagation of this communication frequency band. A band reject filter, a low-pass filter, a high-pass filter, or the like may be applied to the filter 60 to attenuate a radio wave in a specific communication frequency band.

Further, the filter 60 can remove noise. A high pass filter for attenuating a signal of 30 MHz or less can be applied to the filter 60 when the band to be measured through the system is 30 MHz or more.

The filter 60 may include both a filter that attenuates a radio wave of a specific communication frequency band and a filter that removes noise. In this case, it may be designed as one filter, but it may be designed in the form of a filter having two or more stages (for example, a two-stage filter).

The analyzer 40 may request an electric signal of a predetermined level or higher as an input. The analyzer 40 may have a noise floor level and the electrical signals below this level may not be able to measure the magnitude.

The amplifier 70 is capable of amplifying an electric signal transmitted from the electromagnetic wave measuring antenna 20. The amplifier 70 amplifies the electric signal transmitted from the electromagnetic wave measuring antenna 20 to a signal level required by the analyzer 40.

The table 80 serves to fix the communication terminal 11 and to rotate the communication terminal 11. [

Referring to FIG. 2, the table 80 may rotate the communication terminal 11 installed on the table 80 by 360 degrees parallel to the horizontal plane as shown by reference numeral 81. Since the communication terminal 11 emits electromagnetic waves in all directions, the tester measures the electromagnetic interference while rotating the communication terminal 11 by 360 degrees.

Some electronic apparatuses (televisions, electric vehicles, etc.) are fixed in the installation direction, and the electromagnetic interference may be measured only on one plane as shown by reference numeral 81. However, since the communication terminal 11 is an electronic device capable of rotating in all directions, the tester measures the residual wave disturbance while rotating in the same direction as the reference numeral 82. Rotation of the reference numeral 82 may be performed by a rotating arm 83 mounted on the table 80.

An electric motor is included in the table 80 and the rotary arm 83 so that each rotation can be controlled automatically.

The electromagnetic wave measuring antenna 20 can receive electromagnetic waves sensitively for both the horizontal and vertical polarizations. The electromagnetic wave measuring antenna 20 measures the electromagnetic wave interference once with respect to the horizontal polarized wave and rotates 90 degrees (21) to measure the electromagnetic wave interference once with respect to the vertical polarized wave.

3 is a supporting device for measuring electromagnetic waves of a wireless communication device according to an embodiment of the present invention. The support device of Fig. 3 may be an apparatus comprising a combination of reference numerals 80 and 83 as seen in Fig.

The support device 300 for measuring the electromagnetic wave of the wireless communication device includes supporting parts 150 and 160, a first laser light part 110, a second laser light part 120, and a rotation part 140. The rotation part 140 and the support part 150 may be coupled to each other. The two elements 150, 160 constituting the supporting part are combined to form a single supporting part, and the rotating part 160 is rotated as indicated by 102. The direction of rotation of 101 and the direction of rotation of 102 are perpendicular to each other. In the drawings and description, the wireless communication equipment is illustrated as an example of the EUT, but the present invention is not limited thereto, and various kinds of EUT may be installed to measure electromagnetic waves. In addition, although the laser light source unit is provided as an embodiment of the light source unit, this is an embodiment, and all the light sources having the linearity can be applied to the light source unit of the present invention.

In FIG. 3, the support unit 160 supports detachment of the wireless communication equipment. The first laser light source unit 110 directs the wireless communication device to a light source such that the rotation axis of the wireless communication device 130 attached to the device 300 matches the center of the wireless communication device 130. The center pointed by the first laser light source 110 means the rotation axis of the wireless communication device 130 with respect to the rotation direction indicated by the reference numeral 101. The first laser light source unit 110 diverges as shown at 111. That is, the laser divergence axis of the first laser light source unit 110 coincides with the rotation axis of the rotation unit 140.

The second laser light source unit 120 is attached or fixed to the support unit 160 or the wireless communication equipment and indicates a horizontal reference point of the reception antenna that receives the signal of the wireless communication equipment as a light source. The second laser light source unit 120 diverges as indicated by reference numeral 121. That is, the laser divergence axis of the second laser light source unit 120 coincides with the central axis of the vertical rotation 102 of the wireless communication equipment.

The apparatus 300 rotates the wireless communication equipment in the horizontal direction 101 and the vertical direction 102. The vertical light source indicated by the first laser light source unit and the horizontal light source indicated by the second laser light source unit are at right angles. Thus, the wireless communication equipment 130 attached to the device 300 maintains vertical and horizontal levels.

The second laser light source unit 120 may further include a function of measuring a distance between the wireless communication device 130 and the reception antenna.

The rotation directions of 101 and 102 in Fig. 3 can also be implemented in the opposite direction. That is, the rotation directions of 101 and 102 include all directions perpendicular to each other. This applies equally to all the drawings described below.

310 controls the rotation unit 140, the support unit 150 and the support unit 160 of the present invention as an automatic control unit so that the test sample 130 can rotate in the 101 rotation direction and the 102 rotation direction. Of course, such control of rotation includes controlling the direction of rotation as well as its direction and the speed of its rotation. When the signal of the automatic control device is transmitted / received from the outside of the anechoic chamber to the inside, a cable which can block the noise outside the anechoic chamber is used, and the optical cable can be used.

The automatic control device 310 for controlling the support device 300 is not shown for the sake of simplicity.

4 is a diagram illustrating an example of measuring electromagnetic waves of a wireless communication device according to an embodiment of the present invention.

Reference numeral 20 denotes a receiving antenna for receiving unwanted electromagnetic waves of the wireless communication equipment 130.

The first laser light source unit 110 displays the center of the wireless communication device 130 as 111 and the wireless communication device 130 when the rotation unit 140 of the device 300 horizontally rotates in the direction of arrow 101, And continuously displays the center of the communication equipment 130. As a result, the wireless communication device 130 can confirm whether the central point is changed by the rotation.

The second laser light source unit 120 emits a light source such as 121 at the center of the wireless communication device 130 to rotate the receiving antenna 20 . In this case, it can be confirmed that the light source of the receiving antenna 20 is displayed whether or not the wireless communication device 130 is positioned at the center of the rotation axis by the vertical rotation of the wireless communication device 130. In addition, the second laser light source unit 120 may include a distance measuring function to accurately measure a distance between the wireless communication device 130 and the receiving antenna 20 of various sizes.

In FIGS. 3 and 4, the case where the light source is coupled to a supporting device or coupled to an EUT has been described. Hereinafter, an embodiment in which the light source emits light toward the support device and the position of the EUT can be confirmed will be described.

5 is a view showing a center of an EUT according to an embodiment of the present invention, the light source being located on the upper side of the supporting device. Since the other components in Fig. 5 are the same as those in Fig. 3, they are replaced with the description of Fig.

In FIG. 5, the first laser light source 510 is located at the center of the rotation shaft 101 and indicates the center of the EUT 130, such as 511. As a result, in the direction 101, the supporting device 300 indicates the central axis of the horizontal rotation 101. In FIG. 5, the first laser light source unit 510, which is one embodiment of the first light source unit, may be installed in an anechoic room ceiling as shown in FIG.

6 is a view showing a center of an EUT according to another embodiment of the present invention, in which a light source is positioned on a receiving antenna. Since the other components in Fig. 6 are the same as in Figs. 3 and 4, the description of Figs. 3 and 4 replaces them.

6, the laser light source unit 620 is located at the receiving antenna 20 and directs the EUT 130 in the 621 direction. As a result, the laser divergence axis of the second laser light source 520 coincides with the central axis of the vertical rotation 102 of the wireless communication equipment. 6, the second laser light source unit 520, which is an embodiment of the second light source unit, may be coupled to the receiving antenna 20 as shown in FIG. 6, May be installed.

3 to 6 can be combined with the system shown in Figs. 1 and 2 as a whole. Embodiments of the present invention are summarized as follows.

3 and 4, the support device for measuring the electromagnetic wave of the EUT includes a supporting part for supporting the attachment and detachment of the EUT, and a supporting part for supporting the EUT so that the center of the EUT is aligned with the rotation axis of the EUT attached to the equipment. And a second light source part for indicating a horizontal reference point of the receiving antenna which can be attached or fixed to the supporting part or the EUT and receives a signal of the EUT as a light source. The apparatus rotates the EUT in horizontal and vertical directions, and the vertical light source indicated by the first light source unit and the horizontal light source indicated by the second light source unit are at right angles, and the first and second light source units can be a straight-ahead light source. Also, the supporting part may be coupled to the rotation part, and the divergence axis of the light of the first light part may coincide with the rotation axis of the rotation part. And the divergence axis of the light of the second light source unit coincides with the center axis of the vertical rotation of the EUT. The second light source unit may further include a function of measuring a distance between the EUT and the receiving antenna.

The system for measuring the electromagnetic wave of the EUT in the embodiment of FIGS. 5 and 6 includes a supporting device for supporting the EUT and a light source for instructing the EUT so that the center of the EUT coincides with the rotation axis of the EUT attached to the supporting device, And a second light source unit for directing the center of the EUT to a light source at a horizontal reference point of a receiving antenna for receiving a signal of the EUT. In addition, the vertical light source indicated by the first light source unit and the light emitted from the horizontal light source indicated by the second light source unit may be orthogonal to each other, and the first and second light source units may be a direct light source.

In addition, the divergent axis of the light of the first light source unit may be coincident with the horizontal axis of rotation of the rotary unit constituting the support device. And the divergence axis of the light of the second light source unit coincides with the center axis of the vertical rotation of the EUT. The second light source unit may further include a function of measuring a distance between the EUT and the receiving antenna.

3, 4, 5, and 6, of course.

For example, the first light source unit may be attached to the support device and the second light source unit may be fixed to the receiving antenna or the wall surface of the measurement system as shown in FIG. 5, the first light source unit may be fixed to the ceiling of the measurement system and the second light source unit may be attached to the support apparatus.

Both the first and second light sources can be fixed to the ceiling and wall of the measurement system. This can be implemented as shown in FIG.

FIG. 7 is a view illustrating a first light source unit and a second light source unit according to another embodiment of the present invention mounted on the outside of a supporting apparatus. FIG.

In FIG. 7, the first light source unit may be attached to a ceiling such as 510, and the second light source unit may be attached to a wall surface, such as 620, or may be attached to an antenna.

Also, the first light source unit and the second light source unit may be controlled by the automatic control unit 310 shown in FIG. This can be controlled in the process of changing the position of the receiving antenna, changing the supporting device, or precisely adjusting the rotation of the supporting device.

8 is a diagram relating to measurement of the unnecessary frequency.

8, reference numeral 810 denotes a spherical coordinate system, and reference numeral 820 denotes a circumferential coordinate system. 810 and 820, the principle of the spherical coordinate system and the circumferential coordinate system can be used to realize a completely spherical radio signal (unwanted electromagnetic wave). Therefore, the system for measuring electromagnetic waves according to the present invention can measure a radio signal using a spherical coordinate system and a circumferential coordinate system as shown in FIG.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (8)

1. A system for measuring electromagnetic waves in a mobile phone,
A receiving antenna for receiving electromagnetic waves of the mobile phone;
A band reject filter for attenuating a radio wave in a communication frequency band of the mobile phone from an electric signal transmitted from the receiving antenna;
An amplifier for amplifying an electric signal transmitted from the band reject filter;
An analyzer for analyzing an electric signal transmitted from the amplifier and displaying the analyzed electric signal in a spherical coordinate system or a circumferential coordinate system; And
And a support device for rotating the mobile phone horizontally and vertically,
The support device comprises:
A rotating part rotating in a first direction,
A support portion coupled to the rotation portion and supporting the detachment / attachment of the mobile phone and rotating the mobile phone in a second direction perpendicular to the first direction,
A first light source unit positioned on the rotation unit and directing the mobile phone to a light source such that the rotation axis of the mobile phone coincides with the center of the mobile phone;
And a second light source unit that is attached to or fixed to the mobile phone and directs a horizontal reference point of the receiving antenna to a light source.
delete delete The method according to claim 1,
Wherein the second light source portion further comprises a function of measuring a distance between the mobile phone and the receiving antenna.
1. A system for measuring electromagnetic waves in a mobile phone,
A receiving antenna for receiving electromagnetic waves of the mobile phone;
A band reject filter for attenuating a radio wave in a communication frequency band of the mobile phone from an electric signal transmitted from the receiving antenna;
An amplifier for amplifying an electric signal transmitted from the band reject filter;
An analyzer for analyzing an electric signal transmitted from the amplifier and displaying the analyzed electric signal in a spherical coordinate system or a circumferential coordinate system; And
And a support device for rotating the mobile phone horizontally and vertically,
The support device comprises:
A rotating part rotating in a first direction,
A support portion coupled to the rotation portion and supporting the detachment / attachment of the mobile phone and rotating the mobile phone in a second direction perpendicular to the first direction;
And a first light source unit positioned on the rotation unit and directing the mobile phone to a light source such that the first direction rotation axis of the mobile phone and the center of the mobile phone coincide with each other,
The receiving antenna includes:
And a second light source located at a horizontal reference point of the reception antenna and indicating the center of the mobile phone as a light source.
delete delete 6. The method of claim 5,
Wherein the second light source portion further comprises a function of measuring a distance between the mobile phone and the receiving antenna.

Images