Apparatus for measuring electro-magnetic field

Abstract

The present invention relates to an electromagnetic field distribution measuring device, and more specifically, to an electromagnetic field distribution measuring device having a scanning mast in which a plurality of unit receiving antennas are arranged in a vertical direction, and capable of measuring an electromagnetic field distribution while driving the scanning mast in a horizontal direction. The present invention discloses an electromagnetic field distribution measuring device for measuring an electromagnetic field distribution for a wireless power transmission and reception system under near-field conditions, comprising: a scanning mast having a plurality of unit receiving antennas arranged in a vertical direction; a switching circuit for controlling the connection of the plurality of unit receiving antennas; a driving device for moving the scanning mast in a horizontal direction; and a control unit for controlling the driving device and the switching circuit to measure the electromagnetic field distribution for a preset area.

Description

Technology Field

[0001] The present invention relates to an electromagnetic field distribution measuring device, and more specifically, to an electromagnetic field distribution measuring device having a scanning mast in which a plurality of unit receiving antennas are arranged in a vertical direction, and capable of measuring an electromagnetic field distribution while driving the scanning mast in a horizontal direction. Background Technology

[0002] Recently, wireless power transmission technology is rapidly spreading. To give a more specific example, technology that wirelessly transmits power to charge batteries in small home appliances such as smartphones has been commercialized and is in use. Furthermore, wireless power transmission technology is being widely applied in various fields, including electric vehicles.

[0003] However, conventional commercial wireless power transmission technology was limited to transmitting wireless power over short distances using mainly electromagnetic induction or magnetic resonance methods, making it difficult to transmit wireless power over long distances.

[0004] In this regard, attempts are being made to transmit wireless power over long distances using microwaves.

[0005] However, while large transmitting and receiving antennas are required to implement a high-power, high-efficiency wireless power transmission system using microwaves, if the size of the transmitting and receiving antennas becomes several times larger than the wavelength, the far-field condition cannot be satisfied. Consequently, when applying the conventional Friis transmission equation, which uses fixed transmitting and receiving power, antenna gain, and distance under the assumption of a far-field, errors in the calculation of received power and transmission efficiency across the entire reception area may increase.

[0006] Accordingly, in the case of a system using a large antenna that is several times larger than the frequency wavelength, as can be seen in Fig. 1, the received power and transmission efficiency must be calculated using a near-field beam focusing method that takes the antenna gain and distance at each transmitting and receiving position and angle as variables under near-field conditions.

[0007] Therefore, in order to calculate accurate received power and transmission efficiency for a wireless power transmission system under near-field conditions, unlike far-field conditions, a measuring device capable of accurately measuring the electromagnetic field distribution at each reception location is required. Prior art literature

[0008] Korean Published Patent Application No. 10-2013-0107470 (October 2, 2013) The problem to be solved

[0009] The present invention was devised to solve the problems of the prior art described above, and aims to provide an electromagnetic field distribution measuring device capable of accurately measuring the electromagnetic field distribution for each reception location in order to calculate accurate received power, transmission efficiency, etc., for a wireless power transmission system under near-field conditions.

[0010] In addition, the present invention aims to provide an electromagnetic field distribution measuring device capable of rapidly and efficiently processing electromagnetic field distribution measurements in an actual wireless power transmission environment.

[0011] Other detailed objectives of the present invention will be self-evident and understandable to experts or researchers in the art through the specific details described below. means of solving the problem

[0012] An electromagnetic field distribution measuring device according to one aspect of the present invention for solving the above problem comprises: a scanning mast having a plurality of unit receiving antennas arranged in a vertical direction; a switching circuit for controlling the connection of the plurality of unit receiving antennas; a driving device for moving the scanning mast in a horizontal direction; and a control unit for controlling the driving device and the switching circuit to measure the electromagnetic field distribution for a preset area.

[0013] At this time, the control unit may sequentially move the scanning mast to one or more preset positions and sequentially drive the plurality of unit receiving antennas at each position to measure the electromagnetic field distribution for the preset area.

[0014] In addition, the plurality of unit receiving antennas can be rotatably mounted to measure vertical or horizontal polarization.

[0015] In addition, the scanning mast may be mounted so as to be rotatable about a central axis to change the reception angle of the plurality of unit receiving antennas.

[0016] In addition, the above scanning mast may be provided in multiple numbers, two or more.

[0017] In addition, in the switching circuit, one of the plurality of unit receiving antennas can be connected to a measuring device, and the remaining unit receiving antennas can be grounded by load matching.

[0018] In addition, the control unit may control the omission of measurements at some unit receiving antennas by taking into account the measurements at the plurality of unit receiving antennas.

[0019] Furthermore, the control unit can measure the electric field distribution by moving the scanning mast and simultaneously connecting the unit receiving antenna corresponding to a predetermined measurement target point to a measuring device. Effects of the invention

[0020] Accordingly, in an electromagnetic field distribution measuring device according to one embodiment of the present invention, in order to calculate accurate received power, transmission efficiency, etc. for a wireless power transmission system under near-field conditions, it is possible to accurately measure the electromagnetic field distribution for each receiving location.

[0021] In addition, the electromagnetic field distribution measuring device according to one embodiment of the present invention enables rapid and efficient processing of electromagnetic field distribution measurements in an actual wireless power transmission environment. Brief explanation of the drawing

[0022] The accompanying drawings, which are included as part of the detailed description to aid in understanding the present invention, provide embodiments of the present invention and explain the technical concept of the present invention together with the detailed description. FIG. 1 is a diagram illustrating electromagnetic field measurement in a near-field device according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating the configuration of an electromagnetic field distribution measuring device according to one embodiment of the present invention. FIGS. 3 and 4 are drawings illustrating the structure and operation of an electromagnetic field distribution measuring device according to an embodiment of the present invention. FIG. 5 is a drawing illustrating the specific configuration of an electromagnetic field distribution measuring device according to one embodiment of the present invention. FIG. 6 is a diagram illustrating a switching circuit in an electromagnetic field distribution measuring device according to one embodiment of the present invention. FIG. 7 is a diagram illustrating the operation of an electromagnetic field distribution measuring device according to one embodiment of the present invention. FIGS. 8 to 10 are drawings illustrating control settings of an electromagnetic field distribution measuring device according to an embodiment of the present invention. FIG. 11 is a diagram illustrating the results of measuring an electromagnetic field distribution by an electromagnetic field distribution measuring device according to one embodiment of the present invention. Specific details for implementing the invention

[0023] It should be noted that the technical terms used in this invention are used merely to describe specific embodiments and are not intended to limit the scope of the invention. Furthermore, unless specifically defined otherwise in this invention, the technical terms used in this invention should be interpreted in the sense generally understood by those skilled in the art to which this invention pertains, and should not be interpreted in an overly broad or overly narrow sense. Additionally, if a technical term used in this invention is an incorrect technical term that fails to accurately express the concept of this invention, it should be replaced with a technical term that can be correctly understood by a person skilled in the art. Moreover, general terms used in this invention should be interpreted according to their prior definitions or the context, and should not be interpreted in an overly narrow sense.

[0024] Furthermore, singular expressions used in the present invention include plural expressions unless the context clearly indicates otherwise. In the present invention, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the invention, and should be interpreted as meaning that some of the components or steps may not be included, or that additional components or steps may be included.

[0025] Additionally, terms including ordinal numbers, such as first, second, etc., used in the present invention may be used to describe components, but the components shall not be limited by such terms. The terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0026] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. Identical or similar components are given the same reference numeral regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0027] Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such descriptions could obscure the essence of the invention. Additionally, it should be noted that the attached drawings are intended merely to facilitate an understanding of the technical concept of the present invention and should not be interpreted as limiting the technical concept of the invention.

[0028] Below, exemplary embodiments of an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention will be described in turn with reference to the attached drawings.

[0029] First, FIG. 1 describes the measurement of electromagnetic field distribution for a wireless power transmission and reception system under near-field conditions in an electromagnetic field distribution measuring device according to one embodiment of the present invention.

[0030] More specifically, in order to implement a high-power, high-efficiency long-distance wireless power transmission and reception system using microwaves, a large transmitting and receiving antenna is required.

[0031] However, if the aperture size of the transmitting and receiving antenna becomes larger than a predetermined threshold compared to the wavelength (e.g., several times larger), it becomes difficult to satisfy the far-field condition as shown in Equation 1 below in the operating environment of a wireless power transmitting and receiving system.

[0032] [Mathematical Formula 1]

[0033]

[0034] Furthermore, when applying the Friis transmission equation based on fixed transmit / receive power, antenna gain, and distance values ​​under the assumption of the above far-field (see Equation 2 below), a problem arises in which the error in calculating the receive power and transmission efficiency in the entire receiving area can increase, making it difficult to apply.

[0035] [Mathematical Formula 2]

[0036]

[0037] Therefore, as shown in Fig. 1, for systems using large antennas that are several times larger than the frequency wavelength, such as microwave wireless power transmission systems, a method for calculating and measuring received power and transmission efficiency using a near-field beam focusing method is required, which calculates the antenna gain and distance for each transmission and reception position and angle under near-field conditions as shown in Equation 3 below.

[0038] [Mathematical Formula 3]

[0039]

[0040] Accordingly, in an electromagnetic wave distribution measuring device (100) according to one embodiment of the present invention, a device capable of measuring the electromagnetic field distribution for each receiving location is provided in order to calculate accurate received power and transmission efficiency for a wireless power transmission and reception system under near-field conditions.

[0041] More specifically, FIG. 2 illustrates the structure of an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention.

[0042] At this time, as can be seen in FIG. 2, an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention may be configured to include a scanning mast (110) in which a plurality of unit receiving antennas (111) are arranged in a vertical direction, a switching circuit (120) that controls the connection to the plurality of unit receiving antennas (111), a driving device (130) that moves the scanning mast (110) in a horizontal direction, and a control unit (140) that controls the driving device (130) and the switching circuit (120) to measure the electromagnetic field distribution for a preset area.

[0043] In addition, as can be seen in FIG. 3, the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention may be provided with a body part (150) on which the scanning mast (110) is mounted.

[0044] At this time, as can be seen in FIG. 4, the body part (150) may be equipped with all or part of the switching circuit (120) and the control part (140), and the driving device (130) may be equipped to drive the scanning mast (110), and furthermore, a measuring device (160) used to measure the electromagnetic field distribution may be equipped.

[0045] Additionally, as can be seen in FIG. 3, the plurality of unit receiving antennas (111) can be mounted to be tiltable so as to measure vertical or horizontal polarization.

[0046] Additionally, as can be seen in FIG. 4, the scanning mast (110) can be mounted so as to be rotatable about a central axis to change the reception angle of the plurality of unit receiving antennas (111), and accordingly, the optimal reception angle can be derived by measuring the electromagnetic field distribution while changing the reception angle in the actual usage environment of the wireless power transmission and reception system, and furthermore, it is also possible to measure backscattering from the opposite direction.

[0047] Hereinafter, with reference to FIGS. 2 to 4, an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention will be examined in more detail by dividing it into each component.

[0048] First, a plurality of unit receiving antennas (111) can be arranged in a vertical direction on the scanning mast (110).

[0049] At this time, the scanning mast (110) may be configured in a shape such as a cylinder or a cuboid, but the present invention is not necessarily limited thereto and may be configured in various other shapes such as a flat plate.

[0050] Additionally, the scanning mast (110) may be made of a material such as metal, but the present invention is not necessarily limited thereto, and furthermore, the scanning mast (110) may be made of a material and shape that can minimize the effect on the measurement of electromagnetic wave distribution at each unit receiving antenna (111) due to reflection of radio waves, etc.

[0051] Additionally, the scanning mast (110) can be mounted so as to be rotatable about a central axis so as to change the reception angle of the plurality of unit receiving antennas (111).

[0052] In addition, in an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, the scanning mast (110) is configured to have a detachable structure and can be attached to the body part (150) of the electromagnetic field distribution measuring device (110), and furthermore, the electromagnetic field distribution device (100) may be equipped with two or more scanning masts (110).

[0053] Accordingly, in the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, the scanning mast (110) can be detached and moved to an outdoor measuring location, and then the scanning mast (110) can be mounted to perform moving and measuring operations more conveniently.

[0054] Furthermore, in the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, when a plurality of scanning masts (110) are provided, some of them are controlled to measure the electromagnetic field distribution while others are controlled to move in a horizontal direction, thereby shortening the time required for measuring the electromagnetic field distribution and enabling more efficient measurement of the electromagnetic field distribution.

[0055] Additionally, a plurality of unit receiving antennas (111) provided on the scanning mast (110) may be horn antennas, flat plate antennas, etc., but the present invention is not necessarily limited thereto.

[0056] At this time, the plurality of unit receiving antennas (111) may be spaced apart by more than 1 wavelength (λ) to suppress mutual interference.

[0057] In addition, the plurality of unit receiving antennas (111) can be mounted in a tiltable structure to measure vertical or horizontal polarization.

[0058] Next, the switching circuit (120) controls the connection to the plurality of unit receiving antennas (111).

[0059] More specifically, the switching circuit (120) may select one of the plurality of unit receiving antennas (111) and connect it to a measuring device (160) to measure the electromagnetic field distribution at the corresponding point.

[0060] In addition, in the switching circuit (120), one of the plurality of unit receiving antennas (111) is connected to the measuring device (160), and the remaining unit receiving antennas (111) are grounded by matching the load, thereby preventing the influence of the remaining unit receiving antennas (111) that are not used for measurement.

[0061] Furthermore, in the switching circuit (120), two or more of the plurality of unit receiving antennas (111) may be connected to operate as array antennas to increase the sensitivity of electromagnetic field distribution measurement.

[0062] In addition, the above driving device (130) moves the scanning mast (110) in a horizontal direction.

[0063] At this time, the driving device (130) may be a motor driven by electricity, but the present invention is not necessarily limited thereto.

[0064] In addition, the control unit (140) controls the driving device (130) and the switching circuit (120) to measure the electromagnetic field distribution in a preset area.

[0065] At this time, the control unit (140) can control the scanning mast (110) to sequentially move to one or more preset positions and to sequentially drive the plurality of unit receiving antennas (111) at each position to measure the electromagnetic field distribution for the preset area.

[0066] Furthermore, in the above control unit (140), when a plurality of scanning masts (110) are provided, some of them are controlled to measure the electromagnetic field distribution while others are controlled to move in a horizontal direction, thereby reducing the time required for measuring the electromagnetic field distribution.

[0067] In addition, the control unit (140) may control the omission of measurements at some unit receiving antennas (111) by considering the measurements at the plurality of unit receiving antennas (111). For a more specific example, if the electromagnetic field strength measured in an adjacent area does not meet a predetermined reference value, or if the estimated electromagnetic field strength in the current area calculated by considering the electromagnetic field strength measured in the adjacent area is expected to decrease or does not meet the reference value, the control unit (140) controls the omission of measurements at some unit receiving antennas (111), thereby enabling more efficient measurement while reducing the time required for measurement.

[0068] Furthermore, the control unit (140) moves the scanning mast (110) and simultaneously connects the unit receiving antenna corresponding to a predetermined measurement target point to a measuring device to measure the electric field distribution, thereby enabling the movement and measurement to be performed simultaneously and further reducing the time required for measurement.

[0069] In addition, FIG. 5 illustrates the specific configuration of an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, divided by function.

[0070] As can be seen in FIG. 5, an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention may be composed of a unit receiving antenna (111) for receiving an electromagnetic field, a scanning mast (110) on which the unit receiving antenna (111) is mounted, a body part (150) that supports the scanning mast (110) and is equipped with a driving device (130), such as a motor, for moving the scanning mast (110), a switching circuit (120) for changing an electrical connection structure, a measuring device (160), such as a spectrum analyzer, for measuring power received from the unit receiving antenna (111), and a high-frequency (RF) coaxial line for transmitting high-frequency (RF) signals between each component device.

[0071] At this time, a plurality of the unit receiving antennas (111) may be arranged along the axis of the scanning mast (110), and each unit receiving antenna (111) may be connected to the switching circuit (120) through the high frequency (RF) coaxial line, etc.

[0072] In addition, the scanning mast (110) is equipped with a plurality of unit receiving antennas (111), and in order to minimize mutual coupling between each unit receiving antenna (111), it is preferable that the distance between the central axes of each unit receiving antenna (111) be at least one wavelength, and in one embodiment of the present invention, 16 unit receiving antennas (111) are arranged at intervals of 3.8 wavelengths.

[0073] Furthermore, the scanning mast (110) may include a jig capable of mounting the unit receiving antenna (111), and the jig may have a structure capable of tilting 90 degrees for electric / magnetic plane (E- / H-plane) scanning.

[0074] Additionally, the scanning mast (110) may be assembled and disassembled with the body part (150), and furthermore, the number of scanning masts (110) assembled to the body part (150) can be expanded to multiple.

[0075] Additionally, the body part (150) may be equipped with a driving device (130), such as a motor, for horizontally moving the scanning mast (110), and the movement state can be controlled through graphic user interface (GUI) software, etc.

[0076] In addition, the strength of the electromagnetic signal received through the switching circuit (120) can be measured through a measuring device (160), such as an electromagnetic spectrum analyzer, and the operating state of the switching circuit (120), etc. can be controlled through the GUI software, etc.

[0077] At this time, the switching circuit (120) may be configured to include a power module (121), a TTL-based control module (122), and an RF switch (123).

[0078] Furthermore, the switching circuit (120) may be configured as a Single-Pole N-Throw (SPNT) switch having a plurality (N) of contacts for one input / output terminal, and as can be seen in Fig. 6 (b), the Single-Pole N-Throw (SPNT) switch may be configured as an absorbent type switch to eliminate reflected signals from the remaining ports that are not in contact with the antenna.

[0079] Additionally, the control unit (140) may be configured to include a drive control unit (141) that controls a drive device (130), such as a motor, and a control terminal (142).

[0080] At this time, the drive control unit (141) may be configured to include a power module (141a) and a PLC-based control module (141b), and the control terminal (142) may set and monitor the operation of the electromagnetic field distribution measuring device (100) through various graphic user interfaces (GUI).

[0081] Accordingly, in the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, in order to verify the electromagnetic field distribution characteristics radiated in the operating environment of a wireless power transmission and reception system, such as outdoors, several tens of meters 2 In the range reaching [a certain range], ultra-high frequency signals can be effectively scanned and measured, and accordingly, in the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, the measurement time, which previously took several hours to several days, can be shortened from minutes to several hours.

[0082] More specifically, FIG. 7 illustrates an electromagnetic field distribution measurement operation in an electromagnetic field distribution measurement device (100) according to one embodiment of the present invention.

[0083] As can be seen in FIG. 7, in an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, the electromagnetic field distribution for the preset area is measured by sequentially moving the scanning mast (110) to one or more preset positions and sequentially driving the plurality of unit receiving antennas (111) at each position.

[0084] At this time, the time required to measure the electromagnetic field distribution for the area set in the embodiment of FIG. 7 can be expressed as Equation 4 below.

[0085] [Mathematical Formula 4]

[0086]

[0087] Here, M is the number of measurement points on the horizontal axis, N is the number of measurement points on the vertical axis, Td is the time taken at the measurement point, T m is the travel time between measurement points, T s represents the switching time per switch port.

[0088] At this time, in the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, the switch switching time T s is very short at the μs level, so the above T d , T m Since it becomes negligible compared to, it can be simplified as in mathematical equation 4.

[0089] Accordingly, in the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, the time required for measuring the electromagnetic field distribution is the time T required for the scanning mast (110) to move by means of the above M and N, i.e., the measurement area or measurement resolution and the motor, etc. m It comes to depend on.

[0090] However, in the present invention, the scanning mast (110) and the unit receiving antenna (111) must operate sequentially to measure the electromagnetic field distribution as shown in FIG. 7, and in addition, the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention can measure the electromagnetic field distribution in various ways.

[0091] In addition, FIGS. 8 to 10 illustrate control settings of an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention.

[0092] At this time, for the control setting of the electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, the device may include an automatic / manual measurement mode selection window (Fig. 8), a control setting window (Fig. 9) configured for controlling an RF switching circuit (120), a measuring device (160) such as an electromagnetic spectrum analysis device, and a driving device (130) such as a motor, and a measurement result window (Fig. 10) including a function for displaying and saving electromagnetic field distribution detection results and a capture function.

[0093] More specifically, as can be seen in FIG. 8, the user can select an automatic measurement mode (Fig. 8 (a)) and a manual measurement mode (Fig. 8 (a)) through the automatic / manual measurement mode selection window and perform a measurement.

[0094] More specifically, the user can select an automatic or manual measurement mode from the mode selection window of FIG. 8. Accordingly, in the automatic measurement mode, the electromagnetic field distribution is measured by receiving a signal at each measurement point according to the setting value of the control setting window.

[0095] On the other hand, in manual measurement mode, the user sets one or more desired measurement points and measures the electromagnetic field distribution by receiving signals at each measurement point.

[0096] In addition, as can be seen in FIG. 9, the control setting window is composed of an RF switching circuit (120) setting window, a measuring device (160) setting window such as an electromagnetic spectrum analysis device, and a driving device (130) setting window for controlling a motor, etc., and can be linked with each corresponding device.

[0097] More specifically, in the setting window of the RF switching circuit (120), the selection of a measurement switch port, insertion loss compensation (switch insertion loss and connection coaxial line loss, etc.), and switching time (switch sequence time considering switching, control command, measurement, data transmission, storage time, etc.) can be set.

[0098] In addition, in the measurement device (160) setting window for the above-mentioned electromagnetic spectrum analysis device, etc., measurement device settings such as measurement frequency band, resolution, average number of measurements, offset, and Peak / Marker measurement type can be performed.

[0099] In addition, the setting window of the driving device (130) can perform a home operation for setting the reference position of the scanning mast (110), a scanning mast movement function for setting the measurement start position, a spacing setting within the measurement area, and a scanning mast (110) movement speed setting.

[0100] Accordingly, once all necessary settings are completed in the control setting window, as can be seen in FIG. 10, the measurement result window allows observation of whether the measurement has started and the progress of the measurement.

[0101] At this time, the measurement result window performs measurement start / stop / continue control functions and plots an electromagnetic field distribution graph (the X-axis of the graph represents the step value set in the motion setting or the position of the scanning mast (110), and the Y-axis of the graph represents the number of unit receiving antennas (111) of the scanning mast (110)). At this time, a color-mapping function is provided for the graph based on the minimum / maximum measurement values, and furthermore, data such as the measurement reception strength and frequency at the current measurement point can be displayed. In the case of manual measurement mode, the switching circuit setting process is replaced, and furthermore, a measurement status capture function and a measurement result saving function can be provided.

[0102] Accordingly, in an electromagnetic field distribution measuring device (100) according to one embodiment of the present invention, as can be seen in FIG. 11, the electromagnetic field distribution in a set area can be measured and the received wireless power measurement results can be displayed. However, the present invention is not necessarily limited to this, and it is also possible to perform measurements in various ways, such as measurements at specific measurement points or measurements in some areas, and to provide the results in various output formats.

[0103] Accordingly, in an electromagnetic field distribution measuring device according to one embodiment of the present invention, in order to calculate accurate received power, transmission efficiency, etc. for a wireless power transmission system under near-field conditions, it is possible to accurately measure the electromagnetic field distribution for each receiving location.

[0104] In addition, the electromagnetic field distribution measuring device according to one embodiment of the present invention enables rapid and efficient processing of electromagnetic field distribution measurements in an actual wireless power transmission environment.

[0105] The embodiments and drawings described herein are merely illustrative and do not limit the scope of the invention in any way. Furthermore, the connections of lines or connecting members between the components depicted in the drawings are illustrative of functional connections and / or physical or circuit connections, and may be replaced or additionally represented as various functional connections, physical connections, or circuit connections in the actual device. Additionally, unless specifically stated with terms such as "essential" or "importantly," a component may not be strictly necessary for the application of the invention.

[0106] In the specification of the present invention (particularly in the claims), the use of the term "the above" and similar descriptive terms may be in both singular and plural. Furthermore, where a range is described in the present invention, it is implied to include inventions applying individual values ​​belonging to said range (unless otherwise stated), and is equivalent to describing each individual value constituting said range in the detailed description of the invention. Additionally, the steps presented in the method inventions of the present invention are not intended to impose a constraint on their sequential order, and the order may be appropriately changed as necessary, unless a specific step must necessarily precede another step depending on the nature of each process. The use of all examples or exemplary terms (e.g., etc.) in the present invention is merely for the purpose of describing the present invention in detail, and the scope of the present invention is not limited by such examples or exemplary terms unless limited by the claims. Furthermore, a person skilled in the art will understand that various modifications, combinations, and changes may be made according to design conditions and elements within the scope of the claims or equivalents. Explanation of the symbols

[0107] 100: Electromagnetic field distribution measuring device 110 : Scanning Mast 111: Unit receiving antenna 120 : Switching circuit 121: Power module 122 : Control Module 123 : Switch 130 : Driving device 140 : Control unit 141 : Drive control unit 141a: Power module 141b: Control Module 142 : Control terminal 150 : Body part 160 : Measuring device

Claims

Claim 1 An electromagnetic field distribution measuring device for a wireless power transmission and reception system under near-field conditions, comprising: a scanning mast having a plurality of unit receiving antennas arranged in a vertical direction; a switching circuit for controlling the connection of the plurality of unit receiving antennas; a driving device for moving the scanning mast in a horizontal direction; and a control unit for controlling the driving device and the switching circuit to measure the electromagnetic field distribution for a preset area; wherein the control unit controls the omission of measurements at some unit receiving antennas by considering the measurements at the plurality of unit receiving antennas. Claim 2 An electromagnetic field distribution measuring device according to claim 1, wherein the control unit sequentially moves the scanning mast to one or more preset positions and sequentially drives the plurality of unit receiving antennas at each position to measure the electromagnetic field distribution for the preset area. Claim 3 An electromagnetic field distribution measuring device according to claim 1, characterized in that the plurality of unit receiving antennas are rotatably mounted to measure vertical or horizontal polarization. Claim 4 An electromagnetic field distribution measuring device according to claim 1, characterized in that the scanning mast is mounted so as to be rotatable about a central axis to change the reception angle of the plurality of unit receiving antennas. Claim 5 An electromagnetic field distribution measuring device according to claim 1, characterized in that the scanning mast is provided with two or more multiple units. Claim 6 An electromagnetic field distribution measuring device according to claim 1, characterized in that, in the switching circuit, one of the plurality of unit receiving antennas is connected to a measuring device, and the remaining unit receiving antennas are load-matched and grounded. Claim 7 delete Claim 8 An electromagnetic field distribution measuring device according to claim 1, characterized in that the control unit measures the electric field distribution by moving the scanning mast while simultaneously connecting the unit receiving antenna corresponding to a predetermined measurement target point to a measuring device.

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