Dual-frequency printed dipole antenna and testing method thereof

Abstract

The invention belongs to the technical field of microwave equipment, and provides a dual-frequency printed dipole antenna and a testing method thereof. The antenna comprises at least three layers, the first layer is a first dielectric plate, the first layer comprises a trunk distributed on the first dielectric plate, a first dipole and a second dipole, the first dipole and the second dipole are perpendicular to the top end of the trunk and extend towards one side, and the second dipole is formed by being perpendicular to the side wall of the trunk and extending in the opposite direction of the first dipole; the second layer is a dielectric layer; the third layer is a second dielectric plate and comprises a micro-strip balun structure distributed on the second dielectric plate, a third dipole which extends from the top end of the trunk, is opposite to the first dipole and has the same length as the first dipole, and a fourth dipole which extends perpendicular to the side wall of the trunk, is opposite to the second dipole and has the same length as the second dipole; the microstrip balun structure is formed by enclosing a trunk bottom and quarter arc lines on two side walls of the trunk bottom. Compared with the prior art, the antenna can effectively work in two frequency bands of 0.85 GHz and 1.5 GHz so as to meet the requirement of a wireless communication technology for a high-performance dual-frequency antenna.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave devices, and particularly relates to a dual-band printed dipole antenna and a testing method thereof. The antenna is designed to meet the requirements for dual-band antennas in modern wireless communication systems. Background Art

[0002] With the rapid development of wireless communication technology, the requirements for antenna performance are also increasing day by day. Especially in the fields of mobile communication, wireless local area network (WLAN), and global positioning system (GPS), the demand for dual-band antennas that can work simultaneously in multiple frequency bands is continuously growing.

[0003] In the prior art, for example, Chinese Patent Application Publication No. CN115882236A, with the publication title of "Positive-feed excited millimeter-wave broadband OAM reflectarray antenna", specifically discloses that "it includes a dielectric substrate, a ground plane, an air layer, a feed source, and a microstrip split-ring reflectarray; the microstrip split-ring reflectarray includes n split-ring units, and the n split-ring units are uniformly arranged on the upper surface of the dielectric substrate according to a certain relationship, and the microstrip split-ring reflectarray faces the feed source; each split-ring unit includes a rectangular ring composed of 4 metal strip lines; the back of the dielectric substrate is an air layer, and the back of the air layer is a ground plane." Although this patent application has the effects of phase adjustment and gain improvement by adjusting the number of metal strip line rectangular rings in the microstrip split-ring reflectarray antenna, and achieving the generation of vortex beams with high mode numbers, etc., such an antenna does not have the characteristics of wideband and multi-band effective operation, cannot adapt to multiple wireless communication standards, and thus cannot meet the requirements of modern communication systems for antenna versatility. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the purpose of the present invention is to provide a dual-band printed dipole antenna to solve at least one of the technical problems proposed in the background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A dual-band printed dipole antenna, the antenna includes at least three layers, wherein the first layer is a first dielectric plate, and the first layer includes a main trunk distributed on the first dielectric plate, a first dipole and a second dipole extending perpendicularly from the top end of the main trunk towards one side, and the second dipole is formed by extending perpendicularly from the side wall of the main trunk and being arranged in the opposite direction to the first dipole;

[0007] The second layer is a dielectric layer;

[0008] The third layer is the second dielectric plate, which includes a microstrip balun structure distributed on the second dielectric plate, a third dipole extending from the top of the main trunk in the opposite direction and having the same length as the first dipole, and a fourth dipole extending from the side wall perpendicular to the main trunk in the opposite direction and having the same length as the second dipole. The microstrip balun structure is formed by enclosing a quarter circular arc line at the bottom of the main trunk and on both side walls of the bottom of the main trunk.

[0009] As a preferred technical solution of the present invention, the thickness h of the first dielectric plate and the second dielectric plate is 1.48 mm, the length L of the first dielectric plate and the second dielectric plate is 240 mm, the width of the first dielectric plate and the second dielectric plate is 150 mm, and the relative dielectric constant ε r = 2.3;

[0010] And the value range of the length L1 of the first dipole is 145 mm - 150 mm, the value range of the length L2 of the second dipole is 68 mm - 72 mm, the width w of the main trunk is 3 mm, the distance d between the first dipole and the second dipole is 57.3 mm, and the distances from the first dipole and the second dipole to the edge are both a = 40 mm.

[0011] As a preferred technical solution of the present invention, the length L1 of the first dipole is 150 mm, and the length L2 of the second dipole is 72 mm.

[0012] As a preferred technical solution of the present invention, the material selected for the dielectric layer is ZEONEX RS420.

[0013] The present invention application also provides a test method for the dual - frequency printed dipole antenna as described above. This method includes

[0014] The first step: Design of the dual - frequency printed dipole antenna. The design of the dual - frequency printed dipole antenna is carried out according to the structure of the above - mentioned dual - frequency printed dipole antenna. For the 3D model construction, a simulation software is used, and a 3D model of the dual - frequency printed dipole antenna is constructed according to the defined parameters. The 3D model includes a dielectric substrate, a radiation patch, a microstrip balun line, and a feeding structure;

[0015] The second step: Simulation analysis and research. During the process of setting boundary conditions, appropriate boundary conditions are set for the simulation model, and the distance between the radiation space and the antenna is set to one - quarter of the wavelength of the smaller resonance frequency;

[0016] During the port excitation configuration process, that is, configuring the port excitation of the simulation model to simulate the actual feeding conditions and provide the required electromagnetic energy input for the antenna, a rectangular surface with a length of w and a width of h is created in the exact middle in front of the first dielectric plate; and the lumped port excitation is set for the port plane Port, and the port impedance is set to 50Ω;

[0017] During the solution setting process, the operating frequency range of the antenna is 0.85 - 1.5 GHz, and at this time, the solution frequency is set to 1 GHz;

[0018] Then perform simulation operation, execute the simulation operation command, and calculate the electromagnetic characteristics of the antenna in the two frequency bands of 0.85 GHz and 1.5 GHz;

[0019] The third step: Optimize and select the best parameters, including extracting the results of the above first and second steps, extracting key performance parameters from the simulation results, and these parameters include return loss, impedance matching, and three-dimensional gain;

[0020] Then analyze the results, conduct a detailed analysis of the extracted simulation results, and evaluate the operating performance of the antenna in the two target frequency bands of 0.85 GHz and 1.5 GHz;

[0021] Then determine the optimization objective. Based on the simulation results, determine the optimization objective and adjust the resonant frequency to match the specified frequency band;

[0022] Conduct parameter sensitivity analysis. Specifically, conduct parameter sensitivity analysis to identify the parameters that have the greatest impact on the antenna performance;

[0023] Then adjust the parameters. According to the results of the sensitivity analysis, targetedly adjust the key parameters. At the same time, set a joint parameter sweep for the length variables of the first dipole and the second dipole. Set the length L1 parameter of the first dipole from 145 mm to 150 mm, and the length L2 parameter of the second dipole from 68 mm to 72 mm; finally, determine the optimal parameters;

[0024] The fourth step: Test and verify, including parameter combination. According to the optimization results in the third step, recombine the best parameters to construct a new antenna model;

[0025] Simulation settings. Set a new simulation experiment in the simulation software and input the recombined parameters; Re - simulate, run the new simulation experiment, and observe the impact of parameter changes on the antenna performance;

[0026] Pay attention to the return loss, resonant frequency, and three - dimensional gain of the antenna in the two frequency bands of 0.85 GHz and 1.5 GHz;

[0027] Result collection: Collect the performance data after re-simulation, including return loss, impedance matching, and three-dimensional gain. These data will be used for subsequent effect evaluation;

[0028] Effect evaluation: Evaluate the antenna performance after recombining the parameters;

[0029] Verification conclusion: According to the effect evaluation and result analysis, the parameter combination has achieved the expected effect, and the verification is successful.

[0030] As a preferred technical solution of the present invention, the formula calculated in the second step is:

[0031]

[0032] Among them, c represents the speed of light, c is 3×10^8 m / s, f represents the frequency, f is 0.85 GHz, the quarter wavelength is 88.225 mm, and the material inside the radiation space is set as air; and an ideal conductor boundary is set to simulate the metal part of the antenna, and the first dipole, the second dipole, and the lower arc-shaped microstrip balun structure are set as perfect electric boundary (PerfectE).

[0033] As a preferred technical solution of the present invention, in the second step, a sweep setting of 0.1 GHz - 2 GHz is added simultaneously, the sweeptype is selected as fast, and then the return loss of the antenna in the 0.1 GHz - 2 GHz frequency band is analyzed;

[0034] (1) Solve the frequency and mesh discretization settings

[0035] Set the solution frequency to 1 GHz, the maximum number of iterations of the adaptive network discretization to 20, and the convergence error to 0.02;

[0036] 2) Sweep setting

[0037] Select the fast sweep type for the sweep, the sweep frequency range is 0.1 GHz - 2 GHz, and the frequency step is 0.001 GHz.

[0038] As a preferred technical solution of the present invention, the return loss of the dual-frequency printed dipole antenna in the 0.85 GHz frequency band is lower than -10 dB.

[0039] As a preferred technical solution of the present invention, the return loss of the dual-frequency printed dipole antenna in the 1.5 GHz frequency band is lower than -10 dB.

[0040] As a preferred technical solution of the present invention, the simulation software used in the first step and the fourth step is HFSS software for simulation.

[0041] As described above, a dual-frequency printed dipole antenna and its testing method involved in the present invention have the following beneficial effects:

[0042] (1) By optimizing the structure and parameters of the dual - frequency printed dipole antenna, it can effectively operate in two frequency bands of 0.85 GHz and 1.5 GHz to meet the requirements of wireless communication technology for high - performance dual - frequency antennas;

[0043] (2) Through the use of the simulation software HFSS to conduct precise simulation analysis on the antenna model, optimize the design of the dual - frequency printed dipole antenna, ensure that the performance of the antenna in the specified frequency band reaches the expected goal, thereby improving the accuracy and reliability of the antenna design;

[0044] (3) Through the structural design of the dual - frequency printed dipole antenna, miniaturize the antenna, reduce the manufacturing cost, and at the same time maintain the performance of the antenna to meet the strict requirements of modern electronic devices for space and cost;

[0045] (4) Improve the operating ability of the dual - frequency printed dipole antenna in multiple frequency bands, enable it to adapt to multiple wireless communication standards, and meet the requirements of modern communication systems for antenna versatility.

[0046] The following further explains the present invention in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic structural diagram of the dual - frequency printed dipole antenna of the present invention application;

[0048] Figure 2 is the spatial radiation pattern of the dual - frequency printed dipole antenna of the present invention application;

[0049] Figure 3 is a schematic structural diagram of the feeding surface of the dual - frequency printed dipole antenna of the present invention application;

[0050] Figure 4 is a schematic diagram of the drive solution setting in the test method of the dual - frequency printed dipole antenna of the present invention application;

[0051] Figure 5 is a schematic diagram of the scan setting in the test method of the dual - frequency printed dipole antenna of the present invention application;

[0052] Figure 6 is the echo loss diagram in the test method of the dual - frequency printed dipole antenna of the present invention application;

[0053] Figure 7 is the impedance matching diagram in the test method of the dual - frequency printed dipole antenna of the present invention application;

[0054] Figure 8 is the three - dimensional gain pattern in the test method of the dual - frequency printed dipole antenna of the present invention application;

[0055] Figure 9Parameter scan result diagram of the first dipole L1 in the test method of the dual-band printed dipole antenna of the present invention application;

[0056] Figure 10 Parameter scan result diagram of the first dipole L2 in the test method of the dual-band printed dipole antenna of the present invention application;

[0057] Figure 11 One of the combined parameter scan setting diagrams in the test method of the dual-band printed dipole antenna of the present invention application;

[0058] Figure 12 Another combined parameter scan setting diagram in the test method of the dual-band printed dipole antenna of the present invention application;

[0059] Figure 13 Test flow chart in the test method of the dual-band printed dipole antenna of the present invention application;

[0060] Figure 14 Echo loss diagram after re-simulation in the test method of the dual-band printed dipole antenna of the present invention application;

[0061] Figure 15 Impedance matching diagram after re-simulation in the test method of the dual-band printed dipole antenna of the present invention application;

[0062] Figure 16 Three-dimensional gain pattern after re-simulation in the test method of the dual-band printed dipole antenna of the present invention application. Detailed implementation mode

[0063] The following specific embodiments illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0064] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for convenient narration and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented. The specific structure can be described with reference to the drawings of the patent application.

[0065] The present invention application provides a dual-band printed dipole antenna. Please combineFigures 1 to 16 As shown, the antenna includes at least three layers. The first layer is the first dielectric plate, which includes a main trunk 10 distributed on the first dielectric plate, a first dipole 11 extending perpendicularly from the top end of the main trunk 10 towards one side, and a second dipole 12. The second dipole 12 is formed by extending perpendicularly from the side wall of the main trunk 10 and is arranged in the opposite direction to the first dipole 11;

[0066] The second layer is a dielectric layer;

[0067] The third layer is the second dielectric plate, which includes a microstrip balun structure distributed on the second dielectric plate, a third dipole 13 extending from the top end of the main trunk 10 in the opposite direction and having the same length as the first dipole 11, and a fourth dipole 14 extending perpendicularly from the side wall of the main trunk 10 in the opposite direction and having the same length as the second dipole 12. The microstrip balun structure is formed by enclosing a quarter circular arc line 15 at the bottom of the main trunk 10 and the two side walls at the bottom of the main trunk 10.

[0068] Using the above dual-frequency printed dipole antenna, it has the technical effects of wide bandwidth and multi-band effective operation, can adapt to various wireless communication standards, and thus meets the requirements of modern communication systems for the multi-functionality of antennas.

[0069] In order to be able to test the technical effects of the above dual-frequency printed dipole antenna, the present invention application also provides a test method for the dual-frequency printed dipole antenna as described above. Please refer to Figures 1 to 16 As shown, this method includes

[0070] The first step: Design of the dual-frequency printed dipole antenna. The design of the dual-frequency printed dipole antenna is carried out according to the structure of the above dual-frequency printed dipole antenna. For the construction of the 3D model, a simulation software is used, and the 3D model of the dual-frequency printed dipole antenna is constructed according to the defined parameters. The 3D model includes a dielectric substrate, a radiation patch, a microstrip balun line, and a feeding structure;

[0071] Among them, the antenna structure design: Combining Figures 1 to 4 As shown, the thickness h of the first dielectric plate and the second dielectric plate is 1.48 mm, the length L of the first dielectric plate and the second dielectric plate is 240 mm, the width of the first dielectric plate and the second dielectric plate is 150 mm, and the relative dielectric constant ε r = 2.3;

[0072] The value range of the length L1 of the first dipole 11 is 145 mm - 150 mm, the value range of the length L2 of the second dipole 12 is 68 mm - 72 mm, the width w of the main body 10 is 3 mm, the distance d between the first dipole 11 and the second dipole 12 is 57.3 mm, and the distances a between the first dipole 11 and the second dipole 12 and the edge are both 40 mm; through the above settings, the geometric accuracy and physical properties of the model are ensured to be consistent with the design parameters.

[0073] Step 2: Simulation analysis and research. During the process of setting boundary conditions, appropriate boundary conditions are set for the simulation model, and the distance between the radiation space and the antenna is set to one-quarter of the wavelength of the lower resonance frequency.

[0074] The calculation formula in Step 2 is:

[0075]

[0076] Among them, c represents the speed of light, c is 3×10^8 m / s, f represents the frequency, f is 0.85 GHz, one-quarter of the wavelength is 88.225 mm, and the material inside the radiation space is set to air; and an ideal conductor boundary is set to simulate the metal part of the antenna, and the first dipole, the second dipole 12 and the lower arc-shaped microstrip balun structure are set to perfect electric boundary (Perfect E), as shown in Figures 1 to 4 shown to ensure the accuracy of the simulation environment.

[0077] During the process of port excitation configuration, that is, configuring the port excitation of the simulation model to simulate the actual feeding conditions to provide the required electromagnetic energy input for the antenna. A rectangular surface with a length of w and a width of h is created in the exact middle of the front of the first dielectric plate, as shown in Figures 1 to 5 shown; and the port plane Port is set to lumped port excitation, and the port impedance is set to 50 Ω.

[0078] During the process of solution settings, the operating frequency range of the antenna is 0.85 - 1.5 GHz, and at this time, the solution frequency is set to 1 GHz.

[0079] At the same time, a sweep setting from 0.1 GHz to 2 GHz is added, the sweep type is selected as fast, and then the return loss of the antenna in the frequency band of 0.1 GHz - 2 GHz is analyzed.

[0080] 1) Solution frequency and mesh refinement settings

[0081] Set the solution frequency to 1 GHz, the maximum number of iterations of adaptive network refinement to 20, and the convergence error to 0.02, as shown in Figure 4 shown;

[0082] 2) Sweep setting

[0083] The sweep type is selected as fast sweep, the sweep frequency range is 0.1 GHz - 2 GHz, and the frequency step is 0.001 GHz, as shown in Figure 5 the figure;

[0084] Then perform simulation operation, execute the simulation operation command, and calculate the electromagnetic characteristics of the antenna at two frequency bands of 0.85 GHz and 1.5 GHz;

[0085] The third step is to optimize and select the best parameters, including extracting the results of the above first and second steps, extracting key performance parameters from the simulation results, and these parameters include return loss, impedance matching, and three-dimensional gain, and these parameters will be used to evaluate the design performance of the antenna;

[0086] Then analyze the results, conduct a detailed analysis of the extracted simulation results, and evaluate the working performance of the antenna at two target frequency bands of 0.85 GHz and 1.5 GHz;

[0087] Among them, the three-dimensional gain pattern of the antenna (as shown in Figure 8 the figure) shows that the antenna has good radiation performance in the horizontal direction, which is beneficial for applications that require signal coverage in the horizontal plane; combined with figures 6 to Figure 8 the figure, among which the impedance matching diagram and the return loss diagram show that the antenna performs well around 0.87 GHz and 1.53 GHz, and there is a little frequency offset.

[0088] Then determine the optimization goal, based on the simulation results, determine the optimization goal, and adjust the resonant frequency to match the specified frequency band;

[0089] Conduct parameter sensitivity analysis, specifically, conduct parameter sensitivity analysis to identify the parameters that have the greatest impact on the antenna performance; among them Figure 9 and Figure 10 show that the lengths of the first dipole 11 and the second dipole 12 have a greater impact on the resonant frequency, and the length L1 of the first dipole 11 affects the low-frequency resonant frequency, and the length L2 of the second dipole 12 affects the high-frequency resonant frequency;

[0090] Then adjust the parameters. According to the results of the sensitivity analysis, adjust the key parameters targeted, and at the same time set a joint parameter scan for the length variables of the first dipole 11 and the second dipole 12. Set the length L1 parameter of the first dipole 11 from 145 mm to 150 mm, and the length L2 parameter of the second dipole 12 from 68 mm to 72 mm; finally, determine the optimal parameters. Through Figures 11 to 12 the figure, it can be determined that the optimal parameter combination is L1 = 150 mm, L2 = 72, and these parameters make the S11 values of the antenna at the two operating frequency bands meet the engineering requirements for good matching;

[0091] Step 4: Testing and Validation, including parameter combination. According to the optimization results in Step 3, recombine the optimal parameters to construct a new antenna model. This step is to verify the impact of these parameters on the antenna performance under different combinations and ensure their effectiveness in practical applications.

[0092] Simulation settings: Set up a new simulation experiment in the simulation software and input the recombined parameters. Ensure that the simulation environment is consistent with the previous experiment for accurate comparative analysis. Re - simulate: Run the new simulation experiment and observe the impact of parameter changes on the antenna performance.

[0093] Pay attention to the return loss, resonance frequency, and three - dimensional gain of the antenna at two frequency bands of 0.85 GHz and 1.5 GHz.

[0094] Result collection: Collect the performance data after re - simulation, including return loss, impedance matching, and three - dimensional gain. These data will be used for subsequent effect evaluation, as shown in Figures 14 to 16 shown.

[0095] Effect evaluation: Evaluate the performance of the antenna after recombining the parameters. Compare it with the performance of the optimal parameters determined in Step 3. By adjusting the dipole length parameter, improve the resonance frequency so that it performs well at the two target frequencies of 0.85 GHz and 1.5 GHz, and at the same time, the three - dimensional gain and impedance matching also perform well.

[0096] Verification conclusion: According to the effect evaluation and result analysis, the parameter combination has achieved the expected effect and the verification is successful.

[0097] In summary, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0098] The above - mentioned embodiments merely illustrate the principles and effects of the present invention and are not used to limit the present invention. Any person familiar with this technology can modify or change the above - mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A dual-frequency printed dipole antenna, characterized in that: The antenna comprises at least three layers, wherein the first layer is a first dielectric plate, the first layer comprises a trunk distributed on the first dielectric plate and a first dipole and a second dipole extending toward one side perpendicular to the top of the trunk, the second dipole being perpendicular to the side wall of the trunk and extending in an opposite direction to the first dipole; The second layer is the dielectric layer; The third layer is a second dielectric plate, including a microstrip balun structure distributed on the second dielectric plate, a third dipole extending from the top of the trunk in the opposite direction to the first dipole and having the same length as the first dipole, and a fourth dipole extending perpendicular to the side wall of the trunk in the opposite direction to the second dipole and having the same length as the second dipole. The microstrip balun structure is composed of a quarter arc line enclosed by the bottom of the trunk and the two side walls of the bottom of the trunk.

2. A dual-frequency printed dipole antenna as claimed in claim 1, characterized in that: The thickness of the first dielectric plate and the second dielectric plate is h=1.48 mm, the length L of the first dielectric plate and the second dielectric plate is 240 mm, the width of the first dielectric plate and the second dielectric plate is 150 mm, and the relative dielectric constant ε of the first dielectric plate and the second dielectric plate is r =2.3; The length L1 of the first dipole ranges from 145 mm to 150 mm, the length L2 of the second dipole ranges from 68 mm to 72 mm, the width w of the trunk is 3 mm, the distance d between the first dipole and the second dipole is 57.3 mm, and the distances between the first dipole and the second dipole and the edge are both a=40 mm.

3. A dual-frequency printed dipole antenna as claimed in claim 2, characterized in that: The length L1 of the first dipole is 150 mm, and the length L2 of the second dipole is 72 mm.

4. A dual-frequency printed dipole antenna as claimed in claim 1, characterized in that: The material used for the dielectric layer is ZEONEXRS420.

5. A method for testing a dual-frequency printed dipole antenna as claimed in any one of claims 1 to 4, characterized in that: The method includes The first step is to design a dual-frequency printed dipole antenna, wherein the dual-frequency printed dipole antenna is designed according to the structure of the dual-frequency printed dipole antenna of claims 1-4, and a simulation software is used to construct a 3D model of the dual-frequency printed dipole antenna according to defined parameters, and the 3D model includes a dielectric substrate, a radiation patch, a microstrip balun line and a feeding structure; The second step is simulation analysis and research. In the process of boundary condition setting, appropriate boundary conditions are set for the simulation model, and the distance between the radiation space and the antenna is set to a quarter wavelength of the smaller resonant frequency. In the process of port excitation configuration, that is, configuring the port excitation of the simulation model, simulating the actual feeding conditions to provide the antenna with the required electromagnetic energy input, creating a rectangular surface with a length of w and a width of h in the middle of the front of the first dielectric plate; and setting the port plane Port to lumped port excitation, and the port impedance to 50Ω; During the solution setting process, the operating frequency of the antenna ranges from 0.85 to 1.5 GHz, and the solution frequency is set to 1 GHz. Then, the simulation is run and the simulation command is executed to calculate the electromagnetic characteristics of the antenna in the two frequency bands of 0.85 GHz and 1.5 GHz; The third step is to optimize and select the best parameters, including extracting the results of the first and second steps, and extracting key performance parameters from the simulation results, including return loss, impedance matching and three-dimensional gain; Then, the extracted simulation results are analyzed in detail to evaluate the antenna’s operating performance in two target frequency bands, 0.85 GHz and 1.5 GHz; Then, the optimization target is determined, based on the simulation results, and the resonant frequency is adjusted to match the specified frequency band; Parameter sensitivity analysis, specifically, performing parameter sensitivity analysis to identify the parameters that have the greatest impact on antenna performance; Then, the parameters are adjusted. According to the results of the sensitivity analysis, the key parameters are adjusted in a targeted manner. At the same time, a joint parameter scan is set for the length variables of the first dipole and the second dipole. The length L1 parameter of the first dipole is set from 145 mm to 150 mm, and the length L2 parameter of the second dipole is set from 68 mm to 72 mm. Finally, the optimal parameters are determined. The fourth step is testing and verification, including parameter combination. According to the optimization results in the third step, the best parameters are recombined to build a new antenna model. Simulation settings: set up a new simulation experiment in the simulation software and input the re-combined parameters; re-simulate and run the new simulation experiment to observe the impact of parameter changes on antenna performance; Focus on the antenna's return loss, resonant frequency, and three-dimensional gain in the 0.85 GHz and 1.5 GHz frequency bands; Result collection: collect the performance data after re-simulation, including return loss, impedance matching and three-dimensional gain. These data will be used for subsequent effect evaluation; Effect evaluation: evaluate the antenna performance after re-combining parameters; Verification conclusion: According to the effect evaluation and result analysis, the parameter combination achieved the expected effect and the verification was successful.

6. The method for testing a dual-frequency printed dipole antenna as claimed in claim 5, wherein: The formula calculated in the second step is: Among them, c represents the speed of light, c is 3×108 meters per second, f represents frequency, f is 0.85 GHz, a quarter wavelength is 88.225 mm, and the internal material of the radiation space is set to air; and an ideal conductor boundary is set to simulate the metal part of the antenna, and the first dipole, the second dipole and the lower arc-shaped microstrip balun structure are set to the ideal electrical boundary (PerfectE).

7. The method for testing a dual-frequency printed dipole antenna as claimed in claim 5, wherein: In the second step, add the 0.1GHz-2GHz sweep setting, select fast as the sweep type, and then analyze the antenna return loss in the 0.1GHz-2GHz frequency band; (1) Solution frequency and mesh generation settings Set the solution frequency to 1 GHz, the maximum number of iterations of adaptive network partitioning to 20, and the convergence error to 0.02; 2) Frequency sweep setting Select fast sweep as the sweep type, the sweep frequency range is 0.1GHz-2GHz, and the frequency step is 0.001GHz.

8. The method for testing a dual-frequency printed dipole antenna according to any one of claims 5 to 7, characterized in that: The return loss of the dual-frequency printed dipole antenna in the 0.85 GHz frequency band is lower than -10 dB.

9. The method for testing a dual-frequency printed dipole antenna according to any one of claims 5 to 7, characterized in that: The return loss of the dual-frequency printed dipole antenna in the 1.5 GHz frequency band is lower than -10 dB.

10. The test method of the dual-frequency printed dipole antenna according to any one of claims 5 to 7, characterized in that: The simulation software used in the first and fourth steps is HFSS software.

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