Method and system for optimizing electromagnetic radiation performance of metal radiator

Abstract

The invention relates to the technical field of wireless communication, in particular to a method and a system for optimizing electromagnetic radiation performance of a metal radiator. Establishing an electromagnetic simulation model through cooperative work of circuit simulation and electromagnetic field simulation; importing the parameters of the radiator into an electromagnetic simulation model, and simulating to obtain the resonant frequency and electromagnetic radiation intensity characteristics of the radiator so as to evaluate the electromagnetic radiation performance of the radiator in a specific frequency band; when the radiation of the radiator does not meet the design requirement, the influence of the radiator on the wireless receiving performance is reduced by changing the size of the radiator and slotting on the diagonal line of the radiator or enabling the radiator to be far away from an interference source. According to the method, the radiation performance of the metal radiator of the wireless local area network equipment is simulated, and the radiation performance of the metal radiator is optimally designed through simulation evaluation in the digital prototype stage, so that the influence of the metal radiator on the wireless receiving performance is eliminated.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication technology, and in particular to a method and system for optimizing the electromagnetic radiation performance of a metal radiator. Background Art

[0002] With the evolution of wireless LAN communication protocols, the working frequency band of wireless LAN has gradually increased and the working bandwidth has been greatly expanded. Since the attenuation of wireless signals in the high frequency band is more serious, in order to ensure the communication coverage of wireless LAN equipment, it is necessary to increase the power of the wireless signal amplifier, which leads to a significant increase in the power consumption of the whole wireless LAN equipment. In order to ensure the stability of wireless equipment, using metal heat sinks to reduce the temperature of the device chip has become a better solution. However, the metal heat sink will resonate with the high-frequency electromagnetic signal inside the device and transmit it into space. When the electromagnetic resonance frequency of the metal heat sink and the PCB is in the wireless communication working frequency band, it will raise the background noise of the device and affect the receiving performance of the wireless device.

[0003] Regarding the problem of electromagnetic radiation from metal radiators in wireless communication devices affecting wireless reception performance, existing technologies cannot accurately evaluate the impact of metal radiators on wireless reception performance at the digital prototype stage, and therefore cannot eliminate this impact by designing the metal radiator body. The general method of eliminating the impact of metal radiators on wireless reception performance is to suppress the electromagnetic radiation of the radiator by adding absorbing materials, adding grounding connectors, adding filter capacitors, etc. However, these methods are later modification solutions that will increase the cost of the equipment. In addition, they may not be implemented due to limitations such as equipment size and installation location. Summary of the invention

[0004] In response to the above problems, the present disclosure provides a method and system for optimizing the electromagnetic radiation performance of a metal radiator. By simulating the radiation performance of the metal radiator, the radiation performance of the metal radiator is evaluated in the digital prototype stage, and design optimization is performed in advance to solve the impact of the metal radiator on the wireless communication performance.

[0005] In a first aspect, a method for optimizing the electromagnetic radiation performance of a metal heat sink comprises:

[0006] Establish an electromagnetic simulation model through the collaborative work of circuit simulation and electromagnetic field simulation;

[0007] Import the radiator parameters into the electromagnetic simulation model to simulate the resonant frequency and electromagnetic radiation intensity characteristics of the radiator to evaluate the electromagnetic radiation performance of the radiator in a specific frequency band;

[0008] When the radiation of the radiator does not meet the design requirements, the influence of the radiator on the wireless reception performance can be reduced by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source.

[0009] Furthermore, through the collaborative work of circuit simulation and electromagnetic field simulation, an electromagnetic simulation model is established, including:

[0010] Establish a three-dimensional simulation electromagnetic model based on the PCB size, stacking structure, device and microstrip line layout information;

[0011] Convert electromagnetic models into circuit modules through S parameters between interference sources;

[0012] Import the circuit module into the circuit schematic diagram and establish a two-dimensional circuit model;

[0013] The excitation signal is introduced into the two-dimensional circuit model to obtain an electromagnetic simulation model.

[0014] Furthermore, the electromagnetic model is converted into a circuit module through the S parameters between the interference sources, including:

[0015] Add ports at both ends of the interference source and calculate the S parameters between the ports; calculate an S parameter between every two ports, and finally form an S parameter matrix;

[0016] The S parameter matrix in the frequency domain is converted into the admittance matrix in the time domain by the following formula; the admittance matrix is ​​a circuit module that reflects the electrical relationship between the voltage and current of each port:

[0017]

[0018] Among them, S is the S-parameter matrix, U is the unit matrix, Y is the admittance matrix, and Z0 is the port impedance.

[0019] Furthermore, the circuit module is imported into the circuit schematic diagram to establish a two-dimensional circuit model, including:

[0020] Import the circuit module into the circuit schematic diagram, and add a real time-domain pulse voltage source to the port of the circuit module to establish a circuit model;

[0021] Assume that the model block has n ports and the voltage sources added to the n ports are {V1, V2, …, V n}, then the excitation signal on each port I={I1,I2,…,I n}, the n*n matrix in the formula is the admittance matrix, and the formula is as follows:

[0022]

[0023] Furthermore, the excitation signal is introduced into the two-dimensional circuit model to obtain an electromagnetic simulation model, including:

[0024] The two-dimensional circuit model is simulated to obtain the excitation signal I of each interference source port, and then the excitation signal I is converted into a frequency domain signal I(ω) by fast Fourier transform. After the conversion is completed, the excitation signal is imported into the electromagnetic simulation model. The conversion formula is as follows:

[0025] I(ω)=FFT(I).

[0026] Furthermore, the radiator parameters are imported into the electromagnetic simulation model to simulate the resonant frequency and electromagnetic radiation intensity characteristics of the radiator to evaluate the electromagnetic radiation performance of the radiator in a specific frequency band, including:

[0027] Determine the frequency band for evaluating the electromagnetic radiation characteristics of the radiator;

[0028] The size, shape and position information of the radiator are imported into the electromagnetic simulation model to obtain the resonant frequency and electromagnetic radiation intensity characteristics of the radiator, which are used to evaluate the electromagnetic radiation performance of the radiator in a specific frequency band.

[0029] Furthermore, the simulation obtains the resonant frequency and electromagnetic radiation intensity characteristics of the radiator, including:

[0030] Based on the electromagnetic simulation model, when simulating the resonant frequency of the radiator, the interference source port excitation is replaced with a wide-band excitation. The frequency at which the radiator first generates a radiation peak within the wide-band is used as the resonant frequency of the radiator, and the electromagnetic radiation intensity corresponding to the resonant frequency is used as the electromagnetic radiation intensity characteristic of the radiator.

[0031] Furthermore, the influence of the radiator on the wireless reception performance can be reduced by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source, including:

[0032] By changing the size of the radiator, the resonant frequency of the radiator is changed;

[0033] Assuming that the side length of the original heat sink is L0 and the height of the heat sink including the fins is H, the range of the path length L of the current flowing through the heat sink is

[0034] If the original resonant frequency of the radiator is f0, the resonant frequency of the radiator changes from f0 to f1 by increasing or decreasing the side length of the radiator by ΔL; the relationship between the change in the side length of the radiator ΔL and the resonant frequencies f0 and f1 of the radiator is as follows:

[0035]

[0036] Where ΔL is the change in the side length of the radiator, c is the speed of light in a vacuum, and ε eis the effective dielectric constant of the medium, f0 is the resonant frequency of the original radiator, and f1 is the resonant frequency of the radiator after the size is changed.

[0037] Furthermore, the influence of the radiator on the wireless reception performance is reduced by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source, and further comprising:

[0038] By making grooves on the diagonal line of the heat sink, the flow direction and path length of the current on the surface of the heat sink are changed, thereby changing the resonant frequency of the heat sink;

[0039] The relationship between the change in the resonant frequency of the heat sink Δf and the length of the heat sink slot is shown in the following formula:

[0040]

[0041] In the formula, c represents the speed of light in vacuum, ε e is the effective dielectric constant of the medium, and L1, L2 and L3 are parameters related to the heat sink size and slot length.

[0042] Furthermore, the influence of the radiator on the wireless reception performance is reduced by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source, and further comprising:

[0043] Reduce the radiated power of the radiator by moving it away from interference sources;

[0044] Radiant power P r The relationship with the radiator position is shown in the following formula:

[0045]

[0046] Where P r is the electromagnetic radiation power of the radiator, ε e is the effective dielectric constant of the medium, k is the electrostatic force constant, R radiation is the radiation resistance of the radiator itself, parameter s is the area directly opposite to the interference source, parameter d is the distance between the radiator and the interference source, U DM is the real-time pulse voltage generated on the interference source, and the parameters s and d are the parameters related to the position of the radiator relative to the interference source.

[0047] In a second aspect, a system for optimizing electromagnetic radiation performance of a metal heat sink includes: a modeling unit, an evaluation unit, and an optimization unit;

[0048] A modeling unit, used to establish an electromagnetic simulation model through the collaborative work of circuit simulation and electromagnetic field simulation;

[0049] An evaluation unit, used to import the heat sink parameters into the electromagnetic simulation model, simulate the resonant frequency and electromagnetic radiation intensity characteristics of the heat sink, so as to evaluate the electromagnetic radiation performance of the heat sink in a specific frequency band;

[0050] The optimization unit is used to reduce the influence of the radiator on the wireless receiving performance by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source when the radiation of the radiator does not meet the design requirements.

[0051] In a third aspect, an electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0052] a memory storing a computer program;

[0053] The processor is used to implement the above-mentioned method for optimizing the electromagnetic radiation performance of a metal heat sink when executing the computer program stored in the memory.

[0054] In a fourth aspect, a computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for optimizing the electromagnetic radiation performance of a metal heat sink is implemented.

[0055] The present disclosure has at least the following beneficial effects:

[0056] The present invention discloses a method for evaluating the radiation performance of a metal radiator by using data from a digital prototype, and optimizing and adjusting key radiation factors of the metal radiator according to the evaluation results, so as to eliminate the influence of the metal radiator on wireless receiving performance.

[0057] The present invention simulates the radiation performance of the metal heat sink of the wireless local area network device, and develops a method for optimizing the radiation performance of the metal heat sink through simulation evaluation in the digital prototype stage, thereby eliminating the influence of the metal heat sink on the wireless receiving performance.

[0058] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0060] Figure 1 This is a schematic diagram of the optimization method flow of the embodiment of the present disclosure;

[0061] Figure 2 This is a schematic diagram of the simulation process of the electromagnetic radiation characteristics of the radiator;

[0062] Figure 3 This is a flow chart of the heat sink evaluation and optimization module;

[0063] Figure 4 A three-dimensional schematic diagram of slotting for the radiator;

[0064] Figure 5 This is the current distribution diagram before the heat sink is slotted;

[0065] Figure 6 This is the current distribution diagram after the heat sink is slotted;

[0066] Figure 7 A schematic diagram of an optimization system for an embodiment of the present disclosure;

[0067] Figure 8 It is a schematic diagram of the structure of an electronic device;

[0068] Fig. 9 It is a schematic diagram of the three-dimensional model;

[0069] Fig.10 Schematic diagram of the original radiator and the optimized radiator;

[0070] Fig.11 Schematic diagram of the maximum radiation field intensity of the original and optimized radiators in the 2-6 GHz frequency band;

[0071] Fig.12 Schematic diagram of TIS indicators for two types of radiators. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0073] like Figure 1 As shown, a method for optimizing the electromagnetic radiation performance of a metal heat sink comprises:

[0074] S101, establishing an electromagnetic simulation model through the collaborative work of circuit simulation and electromagnetic field simulation;

[0075] S102, importing the heat sink parameters into the electromagnetic simulation model, simulating the resonant frequency and electromagnetic radiation intensity characteristics of the heat sink to evaluate the electromagnetic radiation performance of the heat sink in a specific frequency band;

[0076] S103, when the radiation of the radiator does not meet the design requirements, reduce the influence of the radiator on the wireless receiving performance by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source.

[0077] The specific implementation is as follows:

[0078] This technical solution adopts the following radiator electromagnetic radiation performance evaluation and optimization system and is applied to the digital prototype stage of wireless communication equipment, including:

[0079] Through the collaborative work of circuit simulation and electromagnetic field simulation, the characteristics of the radiator such as the resonant frequency and electromagnetic radiation intensity are simulated.

[0080] Evaluate the electromagnetic radiation performance of the radiator in a specific frequency band. If the radiation of the radiator does not meet the design requirements, optimize the radiator by adjusting key factors to reduce the impact of the radiator on wireless reception performance.

[0081] S101, combine circuit simulation with electromagnetic field simulation, use the high-speed pulse signal on the interference source port as the excitation signal of the model, so that the simulation model is as close to the real radiation scene as possible, which is conducive to accurately simulating the electromagnetic radiation characteristics of the metal radiator. For specific logic and process, see Figure 2 , the execution process is as follows:

[0082] S201, establish a three-dimensional electromagnetic simulation model: establish a three-dimensional full-wave electromagnetic simulation model based on the size, stacking structure, device and microstrip line layout information of the PCB. Some microstrip lines on the PCB carry high-speed pulse signals, thus becoming interference sources that cause electromagnetic radiation of the radiator.

[0083] S202, convert the electromagnetic model into a circuit model through S parameters: add ports at both ends of the interference source and calculate the S parameters between the ports. An S parameter is calculated between every two ports, and finally an S parameter matrix is ​​formed. Through formula (1), the S parameter matrix in the frequency domain can be converted into the admittance matrix in the time domain. The admittance matrix reflects the electrical relationship between the voltage and current of each port, so it can be used as a circuit module and added to the schematic diagram for circuit simulation. In formula (1), S is the S parameter matrix, U is the unit matrix, Y is the admittance matrix, and Z0 is the port impedance.

[0084]

[0085] S203, establish a two-dimensional circuit model and add an excitation signal: import the circuit module obtained above into the circuit schematic diagram, and add a real time domain pulse voltage source to the port of the circuit module to establish a circuit model. Assume that the model block has n ports, and the voltage source added to the n ports is {V1, V2, ..., V n}, then the excitation signal on each port I={I1,I2,…,I n} can be calculated by formula (2), where the n*n matrix is ​​the calculated admittance matrix.

[0086]

[0087] S204, import the excitation signal into the three-dimensional electromagnetic simulation model: simulate the circuit model to obtain the excitation signal I of each interference source port, and then convert the excitation signal I into a frequency domain signal I(ω) through fast Fourier transform, as shown in formula (3). Since the electromagnetic field is calculated in the frequency domain, the excitation signal is converted to the frequency domain to facilitate the electromagnetic field calculation. After the conversion is completed, the excitation signal is imported into the electromagnetic simulation model.

[0088] I(ω)=FFT(I) (3)

[0089] Import radiator model: Import the radiator model into the electromagnetic simulation model based on the radiator's size, shape, and position information.

[0090] Simulate the electromagnetic radiation characteristics of the radiator: First, simulate and calculate the electromagnetic radiation intensity of the radiator. When simulating the resonant frequency of the radiator, replace the interference source port excitation with a wide-band excitation, and use the frequency at which the radiator first produces a strong radiation peak in the wide band as the resonant frequency of the radiator.

[0091] S102, determining an evaluation frequency band: determining a frequency band for evaluating electromagnetic radiation characteristics of the radiator, which frequency band is usually a wireless communication frequency band.

[0092] like Figure 3 As shown, the electromagnetic radiation characteristics of the radiator are evaluated: the size, shape, position and other parameters of the radiator are input, and the electromagnetic radiation characteristics of the radiator in the evaluation frequency band are evaluated, including the resonant frequency and electromagnetic radiation intensity of the radiator.

[0093] Determine whether the electromagnetic radiation characteristics of the radiator meet the design requirements: If the electromagnetic radiation characteristics of the radiator do not meet the design requirements, optimize the key factors affecting the radiation characteristics of the radiator. If the electromagnetic radiation characteristics of the radiator meet the design requirements, output the radiator design solution.

[0094] Optimize key factors: If the evaluation results of the electromagnetic radiation of the heat sink do not meet the design requirements, optimize the key factors that affect the radiation characteristics of the heat sink, such as size, slots, and distance from the interference source, to change the electromagnetic radiation characteristics of the heat sink. This method is used for multiple iterative designs until the electromagnetic radiation characteristics of the heat sink meet the design requirements.

[0095] Output radiator design solution: If the electromagnetic radiation characteristics of the original or optimized radiator in the evaluation frequency band meet the design requirements, the radiator design solution is output.

[0096] S103, the influence of key factors on the electromagnetic radiation characteristics of metal radiators is as follows:

[0097] The effect of changing the size of the heat sink on the electromagnetic radiation characteristics of the metal heat sink: By changing the size of the heat sink, the resonant frequency of the heat sink is changed. Assuming that the side length of the original heat sink is L0 and the height of the heat sink (including the fins) is H, the range of the path length L of the current flowing through the heat sink is If the original resonant frequency of the radiator is f0, the resonant frequency of the radiator changes from f0 to f1 by increasing or decreasing the side length of the radiator by ΔL. The relationship between the change in the side length of the radiator ΔL and the resonant frequencies f0 and f1 of the radiator is shown in formula (4). In formula (4), ΔL is the change in the side length of the radiator, c is the speed of light in a vacuum, and ε is e is the effective dielectric constant of the medium, f0 is the resonant frequency of the original heat sink, and f1 is the resonant frequency of the heat sink after changing its size.

[0098]

[0099] The effect of slotting on the electromagnetic radiation characteristics of metal heat sinks: By slotting the diagonal lines of the heat sink, the flow direction and path length of the current on the surface of the heat sink are changed, thereby achieving the purpose of changing the resonant frequency of the heat sink. Figure 4 When the heat sink (size 55mm×55mm×1mm) is not slotted, the current distribution on the heat sink surface is simulated in the 2.4GHz frequency band as shown in the figure below. Figure 5 As shown. Figure 5 It can be seen that in the 2.4 GHz frequency band of the embodiment, through the simulation of the current direction, the current is fed from the interference source into the heat sink and diffuses to the far end. The current is most densely distributed near the diagonal of the heat sink, that is, the current mainly flows along the dotted line on the main diagonal. The current path length is distributed in Within the range, H is the height of the flat-plate radiator (without fins). The resonant frequency corresponding to a part of the current path falls within the 2.4G operating frequency of WiFi. The radiator in the slotted embodiment is a flat-plate radiator without fins. The slotting mechanism of the finned radiator is the same as that of the flat-plate radiator, and the purpose of changing the resonant frequency of the radiator is also achieved by changing the length of the current path. After hollowing out a slot with a length of 2*L3 on the diagonal line of the radiator perpendicular to the current path, the current needs to bypass the slot and flow along the solid line. After slotting, the distribution of current on the surface of the radiator is as shown in Figure 6 As shown. The current flow path becomes longer, and the main current path length is The corresponding heat sink resonant frequency avoids the 2.4 GHz frequency band of Wi-Fi operation. The relationship between the change in the heat sink resonant frequency Δf and the length of the heat sink slot is shown in formula (5). In formula (5), c represents the speed of light in vacuum, ε e is the effective dielectric constant of the medium. L1, L2 and L3 are parameters related to the size of the heat sink and the length of the slot. Hollowing out slots on the diagonal is not the only way. As long as the slotting method can change the length of the current path on the heat sink, such as opening a cross slot, opening multiple hollow slots, etc., it is within the scope of protection of this disclosure.

[0100]

[0101] The influence of the radiator away from the interference source on the electromagnetic radiation characteristics of the metal radiator: Keeping the radiator away from the interference source can reduce the radiated power of the radiator. r The relationship between P and the radiator position is shown in formula (6). r is the electromagnetic radiation power of the radiator, ε e is the effective dielectric constant of the medium, and k is the electrostatic force constant. radiation is the radiation resistance of the radiator itself, parameter s is the area directly opposite to the interference source, and parameter d is the distance between the radiator and the interference source. DM is the real-time pulse voltage generated on the interference source. The parameters s and d are related to the position of the radiator relative to the interference source. When the radiator is far away from the interference source, the area s facing the radiator and the interference source becomes smaller, and the distance d between the radiator and the interference source becomes larger. According to formula (6), when the radiator is far away from the interference source, the electromagnetic radiation power of the radiator decreases.

[0102]

[0103] like Figure 7 As shown, a system for optimizing electromagnetic radiation performance of a metal heat sink includes: a modeling unit 701, an evaluation unit 702 and an optimization unit 703;

[0104] A modeling unit 701 is used to establish an electromagnetic simulation model through the cooperation of circuit simulation and electromagnetic field simulation;

[0105] An evaluation unit 702 is used to import the heat sink parameters into the electromagnetic simulation model, and simulate the resonant frequency and electromagnetic radiation intensity characteristics of the heat sink to evaluate the electromagnetic radiation performance of the heat sink in a specific frequency band;

[0106] The optimization unit 703 is used to reduce the influence of the radiator on the wireless receiving performance by changing the size of the radiator, slotting the diagonal of the radiator, or moving the radiator away from the interference source when the radiation of the radiator does not meet the design requirements.

[0107] In specific implementation, the resonance frequency and electromagnetic radiation intensity characteristics of the radiator are obtained through the coordinated work of circuit simulation and electromagnetic field simulation;

[0108] Evaluate the electromagnetic radiation performance of the radiator in a specific frequency band; when the radiation of the radiator does not meet the design requirements, optimize the radiator by adjusting key factors to reduce the impact of the radiator on wireless reception performance.

[0109] like Figure 8 As shown, the present disclosure provides an electronic device, including a processor 801, a communication interface 802, a memory 803 and a communication bus 804, wherein the processor 801, the communication interface 802 and the memory 803 communicate with each other through the communication bus 804;

[0110] Memory 803, storing computer programs;

[0111] The processor 801 is configured to implement the above method when executing the computer program stored in the memory 803 .

[0112] The present disclosure provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above method when executed by a processor.

[0113] The computer-readable storage medium may be included in the device / apparatus described in the above embodiment; or it may exist independently without being assembled into the device / apparatus. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the method according to the embodiment of the present disclosure is implemented.

[0114] According to an embodiment of the present disclosure, a computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0115] In order to enable those skilled in the art to better understand the present disclosure, the principles of the present disclosure are described as follows in conjunction with the accompanying drawings:

[0116] The three-dimensional model of the embodiment is shown in Fig. 9 , a wireless communication device is modeled. The PCB in the model is a two-layer structure with a size of 146mm*110mm. A pair of clock differential microstrip lines and two pairs of DQS differential microstrip lines are modeled on the PCB as interference sources of electromagnetic radiation from the radiator. The fundamental frequency of the signal transmitted by these microstrip lines is 800MHz. The original designed radiator is an aluminum plate fin radiator with a size of 40mm*40mm. The simulation shows that the resonant frequency of the radiator is at 3GHz, which is close to the 2.4GHz Wi-Fi frequency band and may affect the wireless reception performance. The radiator is optimized according to formula (4). It is calculated that optimizing the side length of the radiator from 40mm to 27.5mm can make the resonant frequency of the radiator near 4GHz, which is far away from the Wi-Fi frequency band, thereby reducing the impact of the radiator on the wireless reception performance. The original radiator and the optimized radiator are shown in Figure 4. Fig.10 shown.

[0117] The maximum radiation field strength of the original radiator and the optimized radiator in the 2-6 GHz frequency band is as follows: Fig.11 As shown. Fig.11 It can be seen that the resonant frequency of the original radiator is at 3GHz, and the resonant frequency of the optimized radiator is at 4GHz, which is consistent with the theoretical calculation. The original radiator and the optimized radiator are installed in the wireless communication device respectively, and the TIS (Total Isotropic Sensitivity) index of the antenna is tested as follows Fig.12 The smaller the TIS index is, the better the wireless reception performance of the antenna is. Fig.12 It can be seen that after optimizing the radiator, the TIS index of the antenna is generally reduced, which means that the influence of the metal radiator on the wireless reception performance has been eliminated.

[0118] Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A method for optimizing the electromagnetic radiation performance of a metal radiator, characterized in that: The method comprises: Establish an electromagnetic simulation model through the collaborative work of circuit simulation and electromagnetic field simulation; Import the radiator parameters into the electromagnetic simulation model to simulate the resonant frequency and electromagnetic radiation intensity characteristics of the radiator to evaluate the electromagnetic radiation performance of the radiator in a specific frequency band; When the radiation of the radiator does not meet the design requirements, the influence of the radiator on the wireless reception performance can be reduced by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source.

2. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 1, characterized in that: Through the collaborative work of circuit simulation and electromagnetic field simulation, an electromagnetic simulation model is established, including: Establish a three-dimensional simulation electromagnetic model based on the PCB size, stacking structure, device and microstrip line layout information; Convert electromagnetic models into circuit modules through S parameters between interference sources; Import the circuit module into the circuit schematic diagram and establish a two-dimensional circuit model; The excitation signal is introduced into the two-dimensional circuit model to obtain an electromagnetic simulation model.

3. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 2, characterized in that: The electromagnetic model is converted into a circuit module through the S parameters between interference sources, including: Add ports at both ends of the interference source and calculate the S parameters between the ports; calculate an S parameter between every two ports, and finally form an S parameter matrix; The S parameter matrix in the frequency domain is converted into the admittance matrix in the time domain by the following formula; the admittance matrix is ​​a circuit module that reflects the electrical relationship between the voltage and current of each port: Among them, S is the S-parameter matrix, U is the unit matrix, Y is the admittance matrix, and Z0 is the port impedance.

4. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 3, characterized in that: Import the circuit module into the circuit schematic diagram and build a two-dimensional circuit model, including: Import the circuit module into the circuit schematic diagram, and add a real time-domain pulse voltage source to the port of the circuit module to establish a circuit model; Assume that the model block has n ports and the voltage sources added to the n ports are {V1, V2, …, V n }, then the excitation signal on each port I={I1,I2,…,I n }, the n*n matrix in the formula is the admittance matrix, and the formula is as follows:

5. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 2, characterized in that: Import the excitation signal into the two-dimensional circuit model to obtain the electromagnetic simulation model, including: The two-dimensional circuit model is simulated to obtain the excitation signal I of each interference source port, and then the excitation signal I is converted into a frequency domain signal I(ω) by fast Fourier transform. After the conversion is completed, the excitation signal is imported into the electromagnetic simulation model. The conversion formula is as follows: I(ω)=FFT(I).

6. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 1, characterized in that: Import the heat sink parameters into the electromagnetic simulation model to simulate the resonant frequency and electromagnetic radiation intensity characteristics of the heat sink to evaluate the electromagnetic radiation performance of the heat sink in a specific frequency band, including: Determine the frequency band for evaluating the electromagnetic radiation characteristics of the radiator; The size, shape and position information of the radiator are imported into the electromagnetic simulation model to obtain the resonant frequency and electromagnetic radiation intensity characteristics of the radiator, which are used to evaluate the electromagnetic radiation performance of the radiator in a specific frequency band.

7. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 1, characterized in that: The simulation obtains the resonant frequency and electromagnetic radiation intensity characteristics of the radiator, including: Based on the electromagnetic simulation model, when simulating the resonant frequency of the radiator, the interference source port excitation is replaced with a wide-band excitation. The frequency at which the radiator first generates a radiation peak within the wide-band is used as the resonant frequency of the radiator, and the electromagnetic radiation intensity corresponding to the resonant frequency is used as the electromagnetic radiation intensity characteristic of the radiator.

8. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 1, characterized in that: Reduce the impact of the radiator on wireless reception performance by changing the radiator size, slotting the radiator diagonally, or moving the radiator away from interference sources, including: By changing the size of the radiator, the resonant frequency of the radiator is changed; Assuming that the side length of the original heat sink is L0 and the height of the heat sink including the fins is H, the range of the path length L of the current flowing through the heat sink is If the original resonant frequency of the radiator is f0, the resonant frequency of the radiator changes from f0 to f1 by increasing or decreasing the side length of the radiator by ΔL; the relationship between the change in the side length of the radiator ΔL and the resonant frequencies f0 and f1 of the radiator is as follows: Where ΔL is the change in the side length of the radiator, c is the speed of light in a vacuum, and ε e is the effective dielectric constant of the medium, f0 is the resonant frequency of the original radiator, and f1 is the resonant frequency of the radiator after the size is changed.

9. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 1, characterized in that: Reduce the impact of the radiator on wireless reception performance by changing the radiator size, slotting the radiator diagonally, or moving the radiator away from interference sources. This also includes: By making grooves on the diagonal line of the heat sink, the flow direction and path length of the current on the surface of the heat sink are changed, thereby changing the resonant frequency of the heat sink; The relationship between the change in the resonant frequency of the heat sink Δf and the length of the heat sink slot is shown in the following formula: In the formula, c represents the speed of light in vacuum, ε e is the effective dielectric constant of the medium, and L1, L2 and L3 are parameters related to the heat sink size and slot length.

10. The method for optimizing electromagnetic radiation performance of a metal heat sink according to claim 1, characterized in that: Reduce the impact of the radiator on wireless reception performance by changing the radiator size, slotting the radiator diagonally, or moving the radiator away from interference sources. This also includes: Reduce the radiated power of the radiator by moving it away from interference sources; Radiator radiant power P r The relationship with the radiator position is shown in the following formula: Where P r is the electromagnetic radiation power of the radiator, ε e is the effective dielectric constant of the medium, k is the electrostatic force constant, R radiation is the radiation resistance of the radiator itself, parameter s is the area directly opposite to the interference source, parameter d is the distance between the radiator and the interference source, U DM is the real-time pulse voltage generated on the interference source, and the parameters s and d are the parameters related to the position of the radiator relative to the interference source.

11. A system for optimizing electromagnetic radiation performance of a metal radiator, characterized in that: include: Modeling Unit, Evaluation Unit and Optimization Unit; A modeling unit, used to establish an electromagnetic simulation model through the collaborative work of circuit simulation and electromagnetic field simulation; An evaluation unit, used to import the heat sink parameters into the electromagnetic simulation model, simulate the resonant frequency and electromagnetic radiation intensity characteristics of the heat sink, so as to evaluate the electromagnetic radiation performance of the heat sink in a specific frequency band; The optimization unit is used to reduce the influence of the radiator on the wireless receiving performance by changing the size of the radiator, slotting the radiator diagonally, or moving the radiator away from the interference source when the radiation of the radiator does not meet the design requirements.

12. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; a memory storing a computer program; A processor is used to implement a method for optimizing the electromagnetic radiation performance of a metal heat sink as described in any one of claims 1 to 10 when executing a computer program stored in a memory.

13. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, a method for optimizing the electromagnetic radiation performance of a metal heat sink according to any one of claims 1 to 10 is implemented.

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