SAR testing method, electronic equipment, system and storage medium

Abstract

The present application provides a SAR testing method, electronic device, system, and storage medium, relating to the field of SAR testing technology. The method includes: obtaining a distance value between an antenna under test and the top of the device under test; calculating the placement angle of the device under test relative to a body model based on the distance value and a preset angle calculation function, wherein the placement angle is the angle between the plane of the device under test and the upper surface of the body model when the top of the device under test is in contact with the body model, and the placement angle is the same as the angle between the antenna under test and the head model when testing using a head model; controlling a robotic arm to place the device under test on the body model according to the placement angle; obtaining the SAR obtained from the body model test as the test head SAR; and determining whether the radiation of the antenna under test to the human head complies with regulations based on the test head SAR. In this way, there is no need to purchase a head model, which can reduce testing costs.

Description

Technical Field

[0001] The present application relates to the field of SAR testing technology, and in particular to a SAR testing method, electronic equipment, system, and storage medium. Background Art

[0002] The Specific Absorption Rate (SAR) is a measure of radiofrequency exposure. It refers to the amount of radiofrequency energy per unit mass of an exposed object per unit time. It measures the rate at which a living organism absorbs radiofrequency energy from the object being measured (a mobile phone or other electronic device), and is measured in W / kg or mW / g. Biological studies have shown that when humans are exposed to electromagnetic fields with excessive SAR values, tissue heating can reach levels that are hazardous to health. Therefore, the International Commission on Non-Ionizing Radiation (ICNIRP) has established limits for whole-body and local average SAR for the public.

[0003] Currently, SAR testing systems can be used to test whether the SAR of electronic devices to the head (head SAR) exceeds the limit, and also to the body (body SAR) to determine whether the SAR of electronic devices to the body exceeds the limit. Head SAR is measured for electronic devices used near the side of the head, typically in voice-activated calls. Body SAR is measured for electronic devices used near the torso or limbs (excluding head attachments), typically in data communications.

[0004] To test electronic devices, head and body models are used to simulate the human body using electronic devices. Probes on the inner surfaces of these models detect electric field strength, which is then used to derive SAR. Electronic device manufacturers require comprehensive SAR testing systems. However, the high cost of these head models makes them unaffordable. Summary of the Invention

[0005] The present application provides a SAR testing method, electronic equipment, system and storage medium to save the testing cost of SAR testing.

[0006] In a first aspect, an embodiment of the present application provides a SAR testing method, comprising:

[0007] Obtain the distance value between the antenna under test of the device under test and the top of the device under test; calculate the placement angle of the device under test relative to the body model based on the distance value and a preset angle calculation function, wherein the placement angle is the angle between the plane of the device under test and the upper surface of the body model when the top of the device under test is in contact with the body model, and the placement angle is the same as the angle between the antenna under test and the head model when testing using a head model; control the robotic arm to place the device under test on the body model according to the placement angle; obtain the SAR obtained from the body model test as the test head SAR; and determine whether the radiation of the antenna under test to the human head is compliant based on the test head SAR.

[0008] Using this method, an electronic device can obtain the distance between the device's antenna and the top of the device under test. This distance is then substituted into a preset angle calculation function to obtain the placement angle. Placing the device under test on a body model according to this placement angle simulates the angle between the device under test and the head model when the device under test is tested using a head model. This allows the body model to be used to obtain the test head SAR, which can then be used to determine whether the antenna under test radiates to the human head in compliance with regulations. In other words, embodiments of the present application can use a body model to test head SAR, eliminating the need to purchase an additional head model. A large number of test cases for testing head SAR can be obtained using the body model, saving costs.

[0009] In one possible implementation, determining whether the radiation from the antenna under test to the human head is compliant is based on the test head SAR, including: determining whether the test head SAR is less than a preset head SAR limit, where the preset head SAR limit is based on the standard head SAR limit and the test error, where the test error is used to represent the error generated when performing head SAR testing using a body model; if so, determining that the radiation from the antenna under test to the human head is compliant; if not, determining that the radiation from the antenna under test to the human head is non-compliant. The test error can be an error caused by power fluctuations or an error in placement angle. This eliminates the impact of test errors on test results, improves the accuracy of test results, reduces costs, and reduces the risk of unqualified spot checks.

[0010] In one possible implementation, the preset head SAR limit is determined by the following steps:

[0011] The experimental device is tested on a body phantom to obtain the experimental head SAR. The experimental device is then tested on a head phantom to obtain the actual head SAR. The ratio of the experimental head SAR to the actual head SAR is used as the test error. A preset head SAR limit is calculated based on the standard head SAR limit and the test error. Subsequent SAR testing using this preset head SAR limit eliminates the impact of test errors and yields accurate test results.

[0012] In one possible implementation, the experimental antenna of the experimental equipment and the antenna under test have the same frequency band. The preset head SAR limit is calculated based on the standard head SAR limit and the test error, including taking the product of the standard head SAR limit and the test error as the preset head SAR limit. If the application scenario only tests antennas in a single frequency band, the preset head SAR limit can be calculated based on the experimental antenna for that frequency band. This eliminates the test error for antennas in that frequency band, and the preset head SAR limit can be used to accurately measure the radiation compliance of the antenna under test in that frequency band.

[0013] In one possible implementation, there are multiple experimental devices, each with an experimental antenna having a different frequency band. The preset head SAR limit is calculated based on the standard head SAR limit and the test error, including: for each experimental device, multiplying the test error corresponding to the experimental device and the standard head SAR limit as a candidate head SAR limit; and selecting the smallest candidate head SAR limit from the candidate head SAR limits of each experimental device as the preset head SAR limit. In the embodiment of the present application, selecting the smallest candidate head SAR value as the preset head SAR limit is equivalent to adopting the most conservative head SAR limit, which can maximize the control of market sampling risks and improve the quality of electronic products leaving the factory.

[0014] In one possible implementation, the angle calculation function is obtained by the following steps:

[0015] A rectangular coordinate system is established for the head model. According to the placement position of the device under test and the head model during standard testing, a tangent expression for the device under test is obtained. The tangent expression is the expression of the line connecting the ear of the head model's outer contour and the most convex point on the same side of the face. According to the placement position, a preset number of coordinate points are sampled from the ear of the head model's outer contour toward the chin. The sampled coordinate points are fitted into a curve expression. The curve expression is used to represent the curve formed by the probe points on the head model's outer contour. An angle calculation function is obtained using the tangent expression, the curve expression, and trigonometric functions. It can be seen that the embodiment of the present application can calculate the angle calculation function according to the placement position between the device under test and the head model, so that the angle calculation function can accurately represent the angle between the device under test and the head model when the head model is used to perform head SAR testing. The placement angle calculated by the angle calculation function can be used to place the device under test on the surface of the body model, which can replace the head model for head SAR testing, thereby eliminating the need to purchase a head model and saving costs.

[0016] In one possible implementation, the tangent line expression is f1(x1)=-0.0841x1+8, where x1 is the abscissa of the point on the tangent line in the rectangular coordinate system;

[0017] The curve expression is Wherein p1, p2, p3, p4, p5 and p6 are all preset polynomial coefficients, and x2 is the abscissa of the point on the curve in the rectangular coordinate system;

[0018] The angle calculation function is: θ = arctan((8-p6)×(0.9964l) -1 -p1×(0.9964l) 4 -p2×(0.9964l) 3 -p3×(0.9964l) 2 -p4×(0.9964l)-p5)-arctan0.0841, where θ is the placement angle and l is the distance value.

[0019] In a second aspect, an embodiment of the present application provides an electronic device comprising: one or more processors and a memory; the memory is coupled to the one or more processors, the memory is used to store computer program code, the computer program code includes computer instructions, and the one or more processors call the computer instructions to enable the electronic device to execute the method described in the first aspect and any possible implementation method of the first aspect.

[0020] In a third aspect, an embodiment of the present application provides a chip system, which is applied to an electronic device, and the chip system includes one or more processors, which are used to call computer instructions to enable the electronic device to execute the method described in the first aspect and any possible implementation method of the first aspect.

[0021] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, comprising a computer program. When the computer program runs on an electronic device, the electronic device executes the method described in the first aspect and any possible implementation of the first aspect.

[0022] In a fifth aspect, an embodiment of the present application provides a computer program product, which includes: a computer program code, which, when the computer program code runs on an electronic device, enables the electronic device to execute the method described in the first aspect and any possible implementation method of the first aspect.

[0023] In a sixth aspect, an embodiment of the present application provides a SAR testing system, the system comprising a device to be tested, a robotic arm, a body model, and the electronic device of the second aspect;

[0024] A robotic arm, used to place the device under test on the body model according to the placement angle provided by the electronic device;

[0025] Body model, used to feed back the SAR measured by the test to the electronic equipment.

[0026] It is understandable that the electronic device provided in the second aspect, the chip system provided in the third aspect, the computer storage medium provided in the fourth aspect, the computer program product provided in the fifth aspect, and the SAR test system provided in the seventh aspect are all used to perform the methods provided in this application. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects of the corresponding methods and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 is a schematic diagram of a head model in the prior art;

[0029] Figure 2 is a schematic diagram of a body model in the prior art;

[0030] Figure 3 A schematic diagram of a SAR test system provided in an embodiment of the present application;

[0031] Figure 4 A flowchart of a SAR testing method provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the antenna position of a mobile phone provided in an embodiment of the present application;

[0033] Figure 6A A schematic diagram of the three-dimensional structure of the head model provided in an embodiment of the present application;

[0034] Figure 6B A schematic cross-sectional view of a head model provided in an embodiment of the present application;

[0035] Figure 6C A schematic diagram of a rectangular coordinate system established in a cross-section of a head model provided in an embodiment of the present application;

[0036] Figure 6D This is a schematic diagram of the MATLAB interface when fitting a curve expression in an embodiment of the present application;

[0037] Figure 7A and Figure 7B A schematic diagram of the angular relationship between the tangent line and the curve in the rectangular coordinate system;

[0038] Figures 8A-8D Schematic diagram of the effect of placing a mobile phone on a body model at different angles;

[0039] Figure 9 Schematic diagram of the comparison between the test results of the body model and the test results of the head model;

[0040] Figure 10 A schematic diagram of the overall solution of the SAR testing method provided in an embodiment of the present application;

[0041] Figure 11 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0043] It should be noted that, in this application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplarily" or "for example" is intended to present the relevant concepts in a concrete manner.

[0044] To facilitate understanding, the relevant concepts involved in the embodiments of this application are first introduced.

[0045] SAR is the electromagnetic power absorbed or consumed per unit mass of biological tissue (including human tissue) per unit time, measured in W / kg. A higher SAR value indicates a greater impact on the organism, while a lower SAR value indicates a lower impact. To reduce the harm of electromagnetic radiation to the human body, electronic products must undergo SAR testing before leaving the factory.

[0046] According to the EN / IEC 62209-1 and EN / IEC 62209-2 standards developed by the International Electrotechnical Commission, the SAR test scenarios include head SAR and body SAR. In addition, national standards organizations have also specified SAR limit standards for different test scenarios. For example, the body SAR limit and head SAR limit specified by the Federal Communications Commission (FCC) of the United States are both 1.6W / kg, the SAR limit specified by the European Community (CE) is 2.0W / kg, the SAR limit specified by Industry Canada (IC) is 1.6W / kg, and the SAR limit specified by China is 2.0W / kg.

[0047] Currently, the SAR measurement systems used in certification laboratories primarily include the Dose Assessment System (DASY) and cSAR. For example, the cSAR3D, an array-type diode probe fast SAR measurement system developed by SPEAG of Switzerland, can meet SAR testing requirements from 300MHz to 10GHz. Electronic equipment manufacturers can configure the cSAR3D measurement system for R&D testing.

[0048] For the head SAR test scenario, the head model (cSAR3D Head) used for testing head SAR can be used for testing. Figure 1 As shown, taking the need to test a mobile phone as an example, the head model is placed on a platform, and the mobile phone needs to be fixed on the head model through a bracket and a clip to simulate the state of answering a call. An array diode probe is set on the inner surface of the head model, which can identify the electric field strength through the probe to infer the head SAR.

[0049] For the body SAR test scenario, the body model (cSAR3D Flat) used for testing body SAR can be used for testing. Figure 2 As shown, the inner surface of the body model is provided with array diode probes, which can also be called probes. These diode probes can form a planar array system, namely Figure 2 There are probes below the grid area in the figure. For example, when testing a mobile phone, the phone can be placed flat on the body model to simulate the phone being close to the body. The probes then identify the electric field strength and infer the body SAR.

[0050] However, head models are expensive, costing as much as 2 million yuan per set. To build automated head SAR testing capabilities, factories require multiple sets of these models, which is costly and time-consuming. If factories lack head SAR test cases, they risk noncompliance in market spot checks, significantly impacting the company's image, market share, and financial performance.

[0051] In order to solve the above problems, an embodiment of the present application provides a SAR testing method, which can use a body model to test head SAR, that is, no head model is needed. Without adding equipment, the factory's existing body equipment can be used to build test cases that can cover head SAR, thereby realizing automated testing.

[0052] For ease of understanding, the SAR test system involved in the embodiment of the present application is first introduced. Figure 3 As shown, the system includes an electronic device 301 , a robotic arm 302 , a body model 303 and a device to be tested 304 .

[0053] The electronic device 301 is connected to the robotic arm 302 , and the electronic device 301 is connected to the body model 303 .

[0054] The electronic device 301 can be a laptop computer, a desktop computer, etc. Figure 3 In the figure, the electronic device 301 is taken as a notebook computer as an example.

[0055] The robotic arm 302 has an automatic placement program, which can obtain the placement angle provided by the electronic device 301 and then place the device to be tested 304 on the body model 303 according to the placement angle. Figure 3 The robotic arm 302 is only an example, and the embodiment of the present application does not limit the type of the robotic arm 302.

[0056] The body model 303 is used to test the head SAR of the device under test 304 and feed back the head SAR obtained from the test to the electronic device 301 .

[0057] In the embodiment of the present application, the device under test 304 is described as a mobile phone. The device under test 304 can be any type of electronic product that may generate radiation, such as a wearable device, a tablet computer, etc.

[0058] exist Figure 3 Based on the SAR test system shown in FIG, an embodiment of the present application provides a SAR test method, which is applied to the above-mentioned electronic device 301, such as Figure 4 As shown, the method includes:

[0059] S401: Obtain the distance between the antenna under test of the device under test and the top of the device under test.

[0060] Taking a mobile phone as an example, the device to be tested may be provided with an antenna position diagram of the mobile phone and a distance value between the antenna and the top of the mobile phone from the developer.

[0061] like Figure 5 As shown, Figure 5 A schematic diagram of the antenna position of a mobile phone is exemplarily shown, and the number of the antenna can be obtained, that is, antenna 9, and the distance between the antenna and the top of the mobile phone is 26.9 mm.

[0062] S402: Calculate the placement angle of the device under test relative to the body model based on the distance value and a preset angle calculation function.

[0063] The placement angle is the angle between the plane of the device under test and the upper surface of the body model when the top of the device under test is in contact with the body model. This placement angle is the same as the angle between the antenna under test and the head model when testing with a head model. Figure 3 The angle between the device under test 304 and the body model 303 in FIG.

[0064] To ensure test accuracy, different distance values require different placement angles. The angle calculation function is used to represent the corresponding relationship between the angle between the tangent line of the antenna under test and the head model and the distance value when testing using a head model.

[0065] S403: Control the robotic arm to place the device to be tested on the body model according to the placement angle.

[0066] Among them, the electronic device can send the calculated placement angle to the robotic arm, and then the automatic placement program in the robotic arm controls the movement of the robotic arm according to the placement angle, so that the robotic arm places the device to be tested on the body model according to the placement angle.

[0067] For example, Figure 3 The effect after placement is shown in FIG.

[0068] S404: Obtain the SAR obtained from the body model test as the test head SAR.

[0069] Since the angle between the device to be tested and the head model is simulated when the device to be tested is placed, in this case, the SAR obtained by using the body model test can be used as the head SAR. In the embodiment of the present application, the head SAR obtained by using the body model test is referred to as the test head SAR.

[0070] S405: Determine whether the radiation of the antenna to be tested to the human head complies with regulations based on the test head SAR.

[0071] It is understandable that the electronic device can determine whether the head SAR meets the head SAR limit. If so, it is determined that the radiation of the antenna under test to the human head is compliant. Otherwise, it is determined that the radiation of the antenna under test to the human head is not compliant, and further, it can be determined that the radiation of the device under test to the human head is not compliant.

[0072] Using this method, an electronic device can obtain the distance between the device's antenna and the top of the device under test. This distance value is then substituted into a preset angle calculation function to determine the placement angle. Placing the device under test on a body model according to this placement angle simulates the angle between the device under test and the head model when the device under test is tested using a head model. This allows the body model to be used to determine the test head SAR, which can then be used to determine compliance with head radiation regulations. In other words, embodiments of the present application can use a body model to test head SAR, eliminating the need to purchase an additional head model and saving costs.

[0073] In this embodiment, the use of a body phantom instead of a head phantom for SAR testing introduces certain placement errors. Fluctuations in the body phantom's probe's received power and the antenna's transmit power can also lead to test errors. This can cause some discrepancy between the test head SAR measured using this method and the actual head SAR. To improve the accuracy of the final test results, this embodiment eliminates the impact of these errors on the test results by pre-establishing preset head SAR limits.

[0074] The preset head SAR limit is obtained based on the standard head SAR limit and the test error. The test error is used to represent the error generated when performing head SAR testing using a body model.

[0075] Furthermore, after obtaining the test head SAR during the test process, it is determined whether the test head SAR is less than the preset head SAR limit; if so, it is determined that the radiation of the antenna under test to the human head is compliant; if not, it is determined that the radiation of the antenna under test to the human head is not compliant.

[0076] In this way, the impact of test errors on test results can be eliminated, and costs can be reduced while improving the accuracy of test results.

[0077] The following describes how to construct preset head SAR limits.

[0078] In the embodiment of the present application, the test head SAR obtained by using the body model test may also be referred to as the substitute body SAR. The head SAR obtained by using the body model test and the real head SAR (head SAR obtained by using the head model test) have the following relationship:

[0079] Replaced body SAR = head SAR * σ

[0080] Here, σ is used to represent the proportional coefficient of the test error caused by power error and placement error.

[0081] After dividing both sides of the equation by the "head SAR limit" (standard head SAR limit), and shifting σ, we get the following formula:

[0082]

[0083] In the embodiment of the present application, the head SAR limit *σ is defined as the body SAR limit (i.e., the preset SAR limit), and the above formula is modified to obtain:

[0084]

[0085] Since the replaced body SAR=head SAR*σ, the above formula can be transformed into replaced body SAR limit=head SAR limit*σ.

[0086] Based on the above principles, the preset head SAR limit is determined through the following steps:

[0087] Step 1: Use a body model to perform head SAR test on the experimental equipment to obtain the experimental head SAR.

[0088] The experimental device is the device under test used to calculate the preset head SAR limit. This means that the embodiments of this application can calculate a reasonable preset head SAR limit through preliminary experiments. Accordingly, the experimental head SAR is the test head SAR obtained by testing using a body phantom in place of the head phantom, i.e., the replaced body SAR in the above formula.

[0089] Step 2: Use the head model to perform head SAR test on the experimental equipment to obtain the real head SAR.

[0090] The head model is a standard head model, and accordingly, the real head SAR is the head SAR in the above formula.

[0091] Step 3: The ratio of the experimental head SAR to the real head SAR is used as the test error.

[0092] It can be understood that the test error is the above-mentioned σ.

[0093] Step 4: Calculate the preset head SAR limit based on the standard head SAR limit and the test error.

[0094] It should be noted that the test error values caused by antennas in different frequency bands are different.

[0095] In one implementation, if the manufacturer only needs to test antennas in a single frequency band, the test error can be calculated based on the antennas in that frequency band. Specifically, the selected test equipment and the antennas of the device under test (DUT) in the actual test have the same frequency band. Accordingly, step 4 can be implemented by multiplying the standard head SAR limit by the test error as the preset head SAR limit. This allows subsequent SAR testing using this preset head SAR limit to eliminate the impact of test errors and achieve accurate test results.

[0096] In another implementation, if a manufacturer needs to test antennas in multiple frequency bands, or needs to obtain a more universal preset head SAR limit applicable to antennas in various frequency bands, the limit can be calculated for each frequency band separately, and then the minimum limit can be selected as the preset head SAR limit to obtain the most conservative preset head SAR limit.

[0097] Right now,

[0098]

[0099] On this basis, there are multiple experimental devices, and the frequency band of the experimental antenna of each experimental device is different. Step 4 can be specifically implemented as follows:

[0100] For each experimental device, the product of the test error corresponding to the experimental device and the standard head SAR limit is taken as a candidate head SAR limit. The smallest candidate head SAR limit is selected from the candidate head SAR limits of each experimental device as the preset head SAR limit.

[0101] It is understandable that a body model can be used to perform a head SAR test on each experimental device to obtain the experimental head SAR of each experimental device, and a head model can be used to perform a head SAR test on each experimental device to obtain the true head SAR of each experimental device. Then, for each experimental device, the ratio of the head SAR of the experimental device to the true SAR is used as the test error corresponding to the experimental device.

[0102] Since the SAR limit is set relatively low in factory mass production control, the stricter the test, the higher the requirements for electronic products. Therefore, in the embodiment of the present application, the smallest candidate head SAR value is selected as the preset head SAR limit, which is equivalent to adopting the most conservative head SAR limit, which can maximize the control of market sampling risks and improve the quality of electronic products leaving the factory.

[0103] It should be noted that after the preset head SAR limit is calculated, it can be used in subsequent actual testing processes. There is no need to recalculate the preset head SAR limit for each test. Therefore, manufacturers do not need to purchase head models separately for actual testing, which can save costs.

[0104] In the embodiment of the present application, the angle calculation function is also pre-generated, and the angle calculation function is obtained by the following steps:

[0105] Step A: Establish a rectangular coordinate system for the head model. According to the placement of the device under test and the head model during standard testing, obtain the tangent expression of the device under test. The tangent expression is the expression of the line connecting the ear of the head model and the most convex point of the face on the same side.

[0106] According to the IEC 62209-1 standard, the three-dimensional structure of the head model is as follows: Figure 6A As shown, the cross-section of the head model is as follows Figure 6B As shown, Figure 6B The side length of each square is 10 mm.

[0107] In the embodiment of the present application, Figure 6BThe head model shown in the figure establishes a rectangular coordinate system, with the central axis of the head model as the x-axis, the vertical line from the most convex point of the ear of the head model to the central axis of the head model as the y-axis, and the intersection of the central axis and the vertical line as the coordinate origin. Figure 6C shown. Figure 6C The line segment extending from the line connecting the ear of the mid-head model to the most convex point on the face is the tangent line l1 of the simulated position of the device under test, and the coordinates of the point on l1 are (x1, y1).

[0108] It should be noted that during SAR testing, an antenna lock step is typically performed, meaning that only the power transmitted by one antenna when operating is considered, while the other antennas are inactive. In this case, the tangent line to the phone's antenna can be approximated as the line along which the phone's side view lies when placed in the corresponding position on the head model during standard testing. According to regulatory requirements, the phone is placed on the head model surface with its top resting on the ear of the head model's outer contour and its center resting on the most convex point of the face as a support point. Therefore, the tangent line to the phone's antenna passes through the coordinates of the ear of the head model's outer contour (0, 8) and the coordinates of the most convex point of the face (4.4, 7.63). Based on this, the tangent line expression is: f1(x1) = -0.0841x1 + 8.

[0109] Step B: Sample a preset number of coordinate points from the ear to the chin of the head model's outer contour according to the placement position, and fit the sampled coordinate points into a curve expression. The curve expression is used to represent the curve formed by the probe points of the head model's outer contour.

[0110] The preset number of sampling points can be found in Figure 6C The coordinates of the points on the outer contour of the head model can be sampled to fit the curve l2 on the surface of the head model. The coordinates of the points on l2 are (x2, y2); the unit is cm.

[0111] Use MATLAB software to perform polynomial fitting on these points to generate the head model surface curve function expression:

[0112]

[0113] MATLAB is a mathematical software used for data analysis. For example, the MATLAB fitting interface is as follows: Figure 6D As shown, Figure 6DThe curve in the figure is the fitted curve, and the points near the curve are the sampled coordinates. When the polynomial degree is 5, the root mean square error (RMSE) and coefficient of determination (R-square) reach their minimum values, indicating that the error between the fitted curve and the true value is minimal. This indicates that the curve has a high similarity to the head model's outer contour and a good fitting effect. p1, p2, p3, p4, p5, and p6 are all preset polynomial coefficients.

[0114] Step C: using the tangent expression and the curve expression to obtain the angle calculation function of the angle between the device under test and the head model.

[0115] Among them, Figure 7A As shown, Figure 7A The straight line where the line segment OP is located is the tangent line, the curve where OQ is located is the curve of the outer contour of the head model, and P(x, y1) and Q(x, y2) are the intersection points of the tangent line and the curve with the same straight line perpendicular to the x-axis respectively.

[0116] right Figure 7A After simplification, the more intuitive effect is as follows Figure 7B Based on Figure 7B The angle relationship shown can be used to obtain the angle calculation function using trigonometric functions. The specific calculation process is:

[0117]

[0118]

[0119] Where, x = cosβ × l = 0.9964l;

[0120] Can get,

[0121] Where, x = 0.99641; y1 = -0.0841x + 8;

[0122] y2=p1x 5 +p2x 4 +p3x 3 +p4x 2 +p5x+p6;

[0123] therefore,

[0124]

[0125] θ=α-β=arctan((8-p6)x -1 -p1x 4 -p2x 3 -p3x 2-p4x-p5)-arctan0.0841

[0126] Substituting into l we get:

[0127] θ=α-β=arctan((8-p6)×(0.9964l) -1 -p1×(0.9964l) 4 -p2×(0.9964l) 3 -p3×(0.9964l) 2 -p4×(0.9964l)-p5)-arctan0.0841.

[0128] Therefore, the angle calculation function in the embodiment of the present application is θ=arctan((8-p6)×(0.9964l) -1 -p1×(0.9964l) 4 -p2×(0.9964l) 3 -p3×(0.9964l) 2 -p4×(0.9964l)-p5)-arctan0.0841.

[0129] This angle calculation function is applicable to various antenna positions.

[0130] It should be noted that the angle calculation function is pre-calculated. During the actual test process, the distance between the antenna and the top of the device under test can be directly substituted into the function to obtain the placement angle.

[0131] To verify the feasibility of the angle calculation function, the distance values from the working antenna of some mobile phones to the top of the mobile phone were randomly selected in the embodiment of the present application. After substituting them into the angle calculation function, the corresponding relationship between the distance value and the placement angle is shown in Table 1.

[0132] Table 1

[0133]

[0134]

[0135] In order to comprehensively verify the feasibility of the SAR test method provided in the embodiment of the present application, a mobile phone was randomly selected and the distance value l = 2.69 cm of one of the working antennas was obtained.

[0136] Substituting this distance value into the above angle calculation function, we can get:

[0137] θ=arctan((8-p6)×(0.9964l) -1 -p1×(0.9964l) 4-p2×(0.9964l) 3 -p3×(0.9964l) 2 -p4×(0.9964l)-p5)-arctan0.0841=3.5334°.

[0138] Then, the mobile phone was placed on the body model at different angles for testing. Figures 8A-8D As shown, four different placement angles are shown as examples.

[0139] In addition, the mobile phone was placed on the head model according to the standard testing method for testing.

[0140] During the actual test, the antennas of 10 different frequency bands of the mobile phone were tested at four different placement angles, namely 0 degrees, 3 degrees, 6 degrees and 9 degrees. The comparison results of the test results of the body model and the head model are as follows: Figure 9 As shown, Figure 9 The horizontal axis represents the antenna frequency band, and the vertical axis represents the SAR value. These include antennas for 10 different frequency bands: Global System for Mobile Communications (GSM) 1800, GSM900, Long Term Evolution (LTE) B1, LTE B20, LTE B28, LTE B3, LTE B7, LTE B8, Universal Mobile Telecommunications System (UMTS) B1, and UMTS B8.

[0141] pass Figure 9 It can be seen that when the placement angle is around 3 degrees, the head SAR obtained using the body model test is closer to the head SAR obtained using the head model test than when the placement angles are 0 degrees, 6 degrees, and 9 degrees. Therefore, it can be considered that the angle θ = 3.5334° calculated using the angle calculation function is reasonable.

[0142] On this basis, the placement angle is fixed at 3.5° to verify the reliability of the preset head SAR limit calculated in the above embodiment.

[0143] The standard test method can be used to test the head SAR of the mobile phone in different frequency bands using a head model. The mobile phone is then placed on the body model at an angle of 3.5°, and the test head SAR (i.e., the substitute body SAR) in different frequency bands is obtained using the body model.

[0144] Since the standard head SAR limit is 1.6W / kg, the preset head SAR limit (i.e., the replaced body SAR limit) can be calculated as 1.067 using the following formula.

[0145]

[0146] Then, in order to verify the reliability of the preset head SAR limit, 1.067 was substituted into the inverse formula for different frequency bands to inversely deduce the head SAR limit. The inverse formula is:

[0147]

[0148] If the inferred head SAR limit is less than the standard head SAR limit of 1.6, it can be determined that the preset head SAR limit calculated in the embodiment of the present application is reliable. Taking the case of no power fluctuation as an example, the final comparison results are shown in Table 2.

[0149] Table 2

[0150]

[0151]

[0152] It can be seen from Table 2 that in each frequency band, the inferred head SAR limit is lower than the standard head SAR limit. Therefore, the head SAR limit calculated by the embodiment of the present application is reasonable.

[0153] Thus, the method of the present invention can accurately perform head SAR testing on a large number of devices under test without purchasing head models, thus saving costs. Because the antenna position of the mobile phone is known, this method is applicable to testing mobile phones of various brands and has a wide range of applications.

[0154] Based on the introduction of the above embodiments, Figure 10 As shown, the embodiment of the present application mainly uses a body model instead of a head model, and can use a placement angle calculation model to pre-derive an angle calculation function. The angle calculation model is used to calculate the angle between the tangent line where the mobile phone antenna is located and the surface of the head model, and the angle is used as the placement angle. And based on the SAR limit calculation model, the preset head SAR limit is obtained in advance, thereby eliminating the test error between this method and the standard test method. Then, in the actual test process, it can be based on Figure 4 The method shown controls the robotic arm to implement an automated testing solution.

[0155] The placement angle calculation model refers to the mathematical model of the method for calculating the angle calculation function described in the above embodiment, and the SAR limit value calculation model refers to the mathematical model of the method for calculating the preset head SAR described in the above embodiment.

[0156] Figure 11 A schematic diagram of an electronic device portion provided in an embodiment of the present application, the electronic device may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, a wireless communication module 150, a display screen 160, etc.

[0157] It should be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the electronic device. In other embodiments, the electronic device may include more or fewer components than shown, or may combine or separate certain components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0158] The processor 110 may include one or more processing units. For example, the processor 110 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU). The different processing units may be independent devices or integrated into one or more processors.

[0159] The controller can be the nerve center and command center of the electronic device. The controller can generate operation control signals based on the instruction opcode and timing signals to complete the control of instruction fetching and execution.

[0160] Processor 110 may also include a memory for storing instructions and data. In some embodiments, the memory in processor 110 is a cache memory. This memory can store instructions or data that have just been used or are recycled by processor 110. If processor 110 needs to use the same instruction or data again, it can directly call it from the memory. This avoids repeated accesses, reduces processor 110 latency, and thus improves system efficiency.

[0161] In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an I2C interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, etc.

[0162] It is understood that the interface connection relationship between the modules illustrated in this embodiment is only for illustrative purposes and does not constitute a structural limitation on the electronic device. In other embodiments, the electronic device may also adopt different interface connection methods from the above embodiments, or a combination of multiple interface connection methods.

[0163] The charging management module 140 is used to receive charging input from a charger. The charger can be a wireless charger or a wired charger. While charging the battery 142, the charging management module 140 can also power the electronic device through the power management module 141.

[0164] The power management module 141 is used to connect the battery 142, the charging management module 140, and the processor 110. The power management module 141 receives input from the battery 142 and / or the charging management module 140 and provides power to the processor 110, the internal memory 121, the external memory, the display 160, and the wireless communication module 150. In some embodiments, the power management module 141 and the charging management module 140 can also be provided in the same device.

[0165] The wireless communication module 150 can provide wireless communication solutions including WLAN (such as Wi-Fi), Bluetooth, global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), etc., which are applied to electronic devices. The wireless communication module 150 can be one or more devices that integrate at least one communication processing module. The wireless communication module 150 receives electromagnetic waves via an antenna, modulates the frequency of the electromagnetic wave signal and filters it, and sends the processed signal to the processor 110. The wireless communication module 150 can also receive the signal to be sent from the processor 110, modulate the frequency of the signal, amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0166] The electronic device implements display functionality through a GPU, display screen 160, and an application processor. A GPU is a microprocessor for image processing that connects display screen 160 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or modify display information.

[0167] The display screen 160 is used to display images, videos, etc. The display screen 160 includes a display panel.

[0168] The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device. The external memory card communicates with the processor 110 via the external memory interface 120 to implement data storage functions. For example, files such as music and videos can be stored on the external memory card.

[0169] The internal memory 121 can be used to store computer executable program codes, which include instructions. The processor 110 executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory 121. For example, in an embodiment of the present application, the processor 110 can execute the instructions stored in the internal memory 121, and the internal memory 121 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area can store data created during the use of the electronic device (such as audio data, a phone book, etc.), etc. In addition, the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc. In a specific implementation, the present application also provides a computer storage medium, including a computer program program, wherein, when the computer program runs on an electronic device, the electronic device executes some or all of the steps in the above embodiment. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0170] In a specific implementation, an embodiment of the present application further provides a computer program product, which includes computer program code. When the computer program code runs on an electronic device, the electronic device executes some or all of the steps in the above method embodiment.

[0171] The various embodiments of the mechanisms disclosed in this application can be implemented in hardware, software, firmware, or a combination of these implementation methods. The embodiments of the present application can be implemented as a computer program or program code executed on a programmable system, which includes at least one processor, a storage system (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device.

[0172] Program code can be applied to input instructions to perform the functions described herein and generate output information. The output information can be applied to one or more output devices in a known manner. For the purposes of this application, a processing system includes any system having a processor such as, for example, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), or a microprocessor.

[0173] Program code can be implemented with a high-level programming language or an object-oriented programming language to communicate with the processing system. Where necessary, program code can also be implemented in assembly language or machine language. In fact, the mechanism described in this application is not limited to the scope of any particular programming language. In either case, the language can be a compiled language or an interpreted language.

[0174] In some cases, the disclosed embodiments can be implemented in hardware, firmware, software or any combination thereof. The disclosed embodiments can also be implemented as instructions carried or stored on one or more temporary or non-temporary machine-readable (e.g., computer-readable) storage media, which can be read and executed by one or more processors. For example, instructions can be distributed over a network or by other computer-readable media. Therefore, machine-readable media can include any mechanism for storing or transmitting information in a machine (e.g., computer) readable form, including but not limited to, floppy disks, optical disks, optical disks, compact disc read-only memories (Compact Disc Read Only Memory, CD-ROMs), magneto-optical disks, read-only memories (ROM), random access memories (RAM), erasable programmable read-only memories (EPROM), electrically erasable programmable read-only memories (EEPROM), magnetic cards or optical cards, flash memory, or tangible machine-readable memories for transmitting information (e.g., carrier waves, infrared signal digital signals, etc.) using the Internet in electrical, optical, acoustic or other forms of propagation signals. Accordingly, machine-readable media includes any type of machine-readable media suitable for storing or transmitting electronic instructions or information in a form readable by a machine (eg, a computer).

[0175] In the accompanying drawings, some structural or method features may be shown in a particular arrangement and / or order. However, it should be understood that such a particular arrangement and / or order may not be required. Rather, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the accompanying drawings. In addition, the inclusion of a structural or method feature in a particular figure does not imply that such a feature is required in all embodiments, and in some embodiments, such features may not be included or may be combined with other features.

[0176] It should be noted that the units / modules mentioned in the various device embodiments of the present application are all logical units / modules. Physically, a logical unit / module can be a physical unit / module, or a part of a physical unit / module, or can be implemented as a combination of multiple physical units / modules. The physical implementation of these logical units / modules themselves is not the most important. The combination of functions implemented by these logical units / modules is the key to solving the technical problems raised by this application. In addition, in order to highlight the innovative part of this application, the above-mentioned device embodiments of this application do not introduce units / modules that are not closely related to solving the technical problems raised by this application. This does not mean that other units / modules do not exist in the above-mentioned device embodiments.

[0177] It should be noted that in the examples and description of this patent, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0178] Although the present application has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the application.

Claims

1. A SAR testing method, characterized in that: include: Obtaining a distance value between the antenna under test of the device under test and the top of the device under test; Calculating a placement angle of the device under test relative to the body model based on the distance value and a preset angle calculation function, wherein the placement angle is the angle between the plane of the device under test and the upper surface of the body model when the top of the device under test contacts the body model. The placement angle is the same as the angle between the antenna under test and the head model when testing using a head model; Controlling the robotic arm to place the device under test on the body model according to the placement angle; Obtaining the specific absorption rate (SAR) obtained from the body model test as the test head SAR; Determining whether the radiation of the antenna to be tested to the human head complies with regulations based on the test head SAR; The angle calculation function is obtained by the following steps: Establishing a rectangular coordinate system for the head model, and obtaining a tangent expression for the device under test according to the placement of the device under test and the head model during standard testing, wherein the tangent expression is an expression for a line connecting the ear of the head model's outer contour and the most convex point on the same side of the face; According to the placement position, a preset number of coordinate points are sampled from the ear to the chin of the outer contour of the head model, and the sampled coordinate points are fitted into a curve expression, where the curve expression is used to represent the curve formed by the probe points of the outer contour of the head model; The angle calculation function is obtained using the tangent expression, the curve expression and trigonometric functions.

2. The method according to claim 1, characterized in that The determining whether the radiation of the antenna to be tested to the human head complies with regulations based on the test head SAR includes: determining whether the test head SAR is less than a preset head SAR limit, where the preset head SAR limit is obtained based on a standard head SAR limit and a test error, where the test error represents an error generated when performing a head SAR test using the body model; If yes, it is determined that the radiation of the antenna to be tested to the human head complies with the regulations; If not, it is determined that the radiation of the antenna to be tested to the human head is not compliant.

3. The method according to claim 2, characterized in that The preset head SAR limit is determined by the following steps: Performing a head SAR test on the experimental equipment using the body model to obtain an experimental head SAR; Performing a head SAR test on the experimental equipment using the head model to obtain a real head SAR; The ratio of the experimental head SAR to the real head SAR is used as the test error; The preset head SAR limit is calculated based on a standard head SAR limit and the test error.

4. The method according to claim 3, characterized in that The experimental antenna of the experimental equipment has the same frequency band as the antenna to be tested; and calculating the preset head SAR limit value based on the standard head SAR limit value and the test error includes: The product of the standard head SAR limit and the test error is used as the preset head SAR limit.

5. The method according to claim 3, characterized in that There are multiple experimental devices, and the experimental antennas of each experimental device have different frequency bands; and calculating the preset head SAR limit based on the standard head SAR limit and the test error includes: For each experimental device, the product of the test error corresponding to the experimental device and the standard head SAR limit is used as a candidate head SAR limit; The smallest candidate head SAR limit value is selected from the candidate head SAR limit values of each experimental device as the preset head SAR limit value.

6. The method according to claim 1, characterized in that The tangent line expression is f1(x1)=-0.0841x1+8, where x1 is the abscissa of the point on the tangent line in the rectangular coordinate system; The curve expression is: Wherein p1, p2, p3, p4, p5 and p6 are all preset polynomial coefficients, and x2 is the abscissa of the point on the curve in the rectangular coordinate system; The angle calculation function is θ = arctan ((8-p6) × (0.9964l) -1 -p1×(0.9964l) 4 -p2×(0.9964l) 3 -p3×(0.9964l) 2 -p4×(0.9964l)-p5)-arctan0.0841, where θ is the placement angle and l is the distance value.

7. An electronic device, characterized in that: include: one or more processors and memory; The memory is coupled to the one or more processors, and the memory is used to store computer program code, where the computer program code includes computer instructions. The one or more processors call the computer instructions to enable the electronic device to execute the method according to any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that The method comprises a computer program, which, when running on an electronic device, causes the electronic device to perform the method according to any one of claims 1 to 6.

9. A SAR test system, characterized in that: The system comprises a device to be tested, a robotic arm, a body model, and the electronic device according to claim 7; The robotic arm is used to place the device under test on the body model according to the placement angle provided by the electronic device; The body model is used to feed back the SAR obtained from the test to the electronic device.

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