Method for improving antenna system operating performance and antenna system operating performance simulation method

Abstract

The present invention relates to the field of antenna system technology, and in particular to a method for improving the operating performance of an antenna system and a method for simulating the operating performance of an antenna system. A metal truss electromagnetic window is used as a protective cover for the antenna system, and a variable-section electromagnetic window structure is used, wherein the variable-section electromagnetic window structure uses trusses of different widths to form irregular pseudo-randomly distributed trusses; the electromagnetic window pseudo-randomly distributed trusses are used to offset the scattering effect between the electromagnetic window trusses; the influence on the electromagnetic performance of the antenna system is weakened by offsetting the scattering effect between the trusses, thereby improving the operating performance of the antenna system; the variable-section electromagnetic window structure can also optimize the mechanical properties of the electromagnetic window. The present invention can achieve optimization effects on electromagnetic and mechanical properties by using a variable-section electromagnetic window structure, effectively improve the comprehensive electromechanical performance of the electromagnetic window, better provide services for the operation of the antenna system, and has good application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna systems, and in particular to a method for improving the operating performance of an antenna system and a method for simulating the operating performance of an antenna system. Background Art

[0002] The electromagnetic window metal truss, which serves as a protective cover for the antenna system, is composed of a large number of staggered metal trusses and truss connection nodes. The electromagnetic scattering effect of these trusses as a whole determines the electromagnetic performance of the MSF electromagnetic window. When electromagnetic waves pass through the metal truss, they do not continue to transmit on the outer surface after linear attenuation and phase shift like dielectric shells, but become a new directional scattering source. This scattering effect not only affects the amplitude and phase of the radio wave, but the interference of the scattered field will also cause the far-field radiation pattern of the antenna to be distorted, thereby affecting the operating performance of the antenna system. Summary of the invention

[0003] To this end, the present invention provides a method for improving the operating performance of an antenna system and a method for simulating the operating performance of an antenna system, which utilizes a variable-section electromagnetic window structure to achieve optimization effects on electromagnetic performance and mechanical performance, effectively improves the comprehensive mechanical and electrical performance of the electromagnetic window, and can better provide services for the operation of the antenna system.

[0004] According to the design scheme provided by the present invention, a method for improving the operating performance of an antenna system, a metal truss electromagnetic window is used as a protective cover for the antenna system, and a variable-section electromagnetic window structure is adopted, wherein the variable-section electromagnetic window structure adopts trusses of different widths to form irregular pseudo-randomly distributed trusses; the pseudo-randomly distributed trusses of the electromagnetic window are used to offset the scattering effect between the trusses of the electromagnetic window; the influence on the electromagnetic performance of the antenna system is weakened by offsetting the scattering effect between the trusses, thereby improving the operating performance of the antenna system; the variable-section electromagnetic window structure can also optimize the mechanical properties of the electromagnetic window.

[0005] As a method for improving the operating performance of the antenna system of the present invention, further, the cross-section of the variable-section electromagnetic window structure truss is composed of multiple variable-section hexagonal units, the sides of each variable-section hexagonal unit are connected by a truss at one end and the other end, the diagonal of the variable-section hexagonal unit is composed of truss two, and the skin is arranged in a triangle formed by the diagonal and sides of the variable-section hexagonal unit.

[0006] As a method for improving the operating performance of the antenna system of the present invention, further, the width of the truss rod one is greater than the width of the truss rod two.

[0007] As a method of improving the operating performance of the antenna system of the present invention, further, a connection node for fixing the connection truss rod 2 is provided at the center of the variable-section hexagonal unit, and the truss rod 2 forms the diagonal of the variable-section hexagonal unit through the connection node.

[0008] Furthermore, based on the above content, the present invention also provides an antenna system operation performance simulation method, which specifically includes the following contents:

[0009] A combined model for simulation testing is constructed, the combined model comprising: an antenna model and a variable-section electromagnetic window model, wherein the antenna model adopts a Cassegrain antenna model, and the variable-section electromagnetic window model forms an irregular pseudo-random distribution electromagnetic window model by adopting trusses of different widths;

[0010] The performance of the combined model is simulated using three-dimensional full-wave electromagnetic simulation software, and the simulation parameter settings are adjusted according to the experimental frequency during the simulation process.

[0011] As a method for simulating the operating performance of the antenna system of the present invention, further, during the simulation process, the distribution of trusses within the antenna aperture of the antenna model is changed by performing an angle rotation transformation on the variable-section electromagnetic window model to eliminate the influence of the distribution of trusses within the antenna aperture on the simulation results.

[0012] As a method for simulating the operating performance of the antenna system of the present invention, further, based on the simulation data at each rotation transformation angle of the variable cross-section electromagnetic window model, the final simulation result is obtained by taking the average value.

[0013] Beneficial effects of the present invention:

[0014] The present invention utilizes a variable-section electromagnetic window structure composed of trusses of different widths, which can not only reduce the impact on the electromagnetic performance of the antenna system by offsetting the scattering effect between the trusses, but also optimize the mechanical properties of the metal truss electromagnetic window to better serve the operation of the antenna system; and uses a simulation method to simulate and test the scheme for improving the operating performance of the antenna system. The simulation results can further verify that in this case, the variable-section electromagnetic window not only reduces the insertion loss in electromagnetic performance, but also has a larger moment of inertia and bending modulus in mechanical performance, that is, the variable-section electromagnetic window has achieved optimization effects in both electromagnetic and mechanical properties, effectively improving the comprehensive electromechanical performance of the electromagnetic window, and can better provide services for the operation of the antenna system, with good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a method for improving the operating performance of an antenna system in an embodiment;

[0016] Figure 2 This is a schematic diagram of a variable cross-section hexagonal unit structure in an embodiment;

[0017] Figure 3 is the real part of the average induced current rate of the metal truss in the embodiment The relationship with W / λ is shown;

[0018] Figure 4It is a simulation diagram of a variable cross-section electromagnetic window model in the embodiment;

[0019] Figure 5 It is a schematic diagram of the Cassegrain antenna model feed source simulation in the embodiment;

[0020] Figure 6 It is a schematic side view of a Cassegrain antenna model simulation in the embodiment;

[0021] Figure 7 It is a schematic diagram of the combined model simulation in the embodiment.

[0022] In the figure, reference numeral 11 represents truss 1, reference numeral 12 represents truss 2, reference numeral 2 represents connection node, and reference numeral 3 represents skin. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and technical solutions, and the implementation methods of the present invention will be described in detail through preferred embodiments, but the implementation methods of the present invention are not limited thereto.

[0024] Embodiments of the present invention, see Figure 1 As shown, a method for improving the operating performance of an antenna system is provided. A metal truss electromagnetic window is used as a protective cover for the antenna system. The scattering effect between each truss of the electromagnetic window affects the electromagnetic performance of the antenna system through superposition. The metal truss electromagnetic window adopts a variable cross-section electromagnetic window structure, wherein the variable cross-section electromagnetic window structure uses trusses of different widths to form an irregular pseudo-randomly distributed truss; the pseudo-randomly distributed truss of the electromagnetic window is used to offset the scattering effect between the trusses of the electromagnetic window; the influence on the electromagnetic performance of the antenna system is weakened by offsetting the scattering effect between the trusses, thereby improving the operating performance of the antenna system; the variable cross-section electromagnetic window structure can also optimize the mechanical properties of the electromagnetic window. By using the variable cross-section electromagnetic window structure, the optimization effect can be achieved in the electromagnetic performance and mechanical performance, the comprehensive mechanical and electrical performance of the electromagnetic window can be effectively improved, and better services can be provided for the operation of the antenna system.

[0025] As a method for improving the operating performance of the antenna system in an embodiment of the present invention, further, see Figure 2 As shown, the cross-section of the variable-section electromagnetic window structure truss is composed of a plurality of variable-section hexagonal units, the sides of each variable-section hexagonal unit are connected end to end by truss 11, the diagonal of the variable-section hexagonal unit is composed of truss 2 12, and the skin 3 is arranged in a triangle formed by the diagonal and sides of the variable-section hexagonal unit; the width of truss 11 is greater than the width of truss 2 12; truss 2 12 is a thin metal truss, which is arranged inside each hexagonal area, and truss 11 is a thick metal truss, forming a boundary shared with adjacent hexagons; a connection node for fixing and connecting truss 2 12 is arranged at the center of the variable-section hexagonal unit, and truss 2 12 forms the diagonal of the variable-section hexagonal unit through the connection node 2.

[0026] like Figure 3 As shown, the real part of the average induced current rate of the metal truss is The relationship with the width-to-wavelength ratio W / λ varies with the depth-to-width ratio d / W, and electromagnetic windows of equal cross-section and variable cross-section are set, where the width of the metal truss of equal cross-section is W, and the widths of the metal truss of variable cross-section are W1 and W2 respectively, and the depth-to-width ratio is k. Since the thin metal trusses are inside each hexagonal area and the thick metal trusses are shared with adjacent hexagons as boundaries, the ratio of the number of thick and thin trusses can be set to 1:2. In order to compare and analyze the electromechanical properties of the two electromagnetic windows, the average blocking ratios of the metal trusses of the equal-section electromagnetic window and the metal trusses of the variable-section electromagnetic window are kept consistent, that is, W1=W+2Δ, W2=W-Δ, where Δ is an arbitrary constant. Due If the curve has a convex interval, then Since the average blocking ratio β of the metal trusses of the two electromagnetic windows m Keep the same, and the radius and truss length of the two electromagnetic windows remain unchanged, and the curvature correction factor Q r Same, then Therefore, T pc | 2 >|T pe | 2 , that is, the theoretical power transmission coefficient of the variable cross-section electromagnetic window |T pc | 2 It is better than the power transmission coefficient of electromagnetic window with equal cross section |T pe | 2 .

[0027] Since it is impossible to accurately calculate the mechanical properties of the metal truss electromagnetic window with a pseudo-random spherical structure, when the sphere is large, a wind-exposed area of ​​the electromagnetic window is taken and approximately regarded as a plane structure, and then the mechanical properties of the electromagnetic windows of the two structures are estimated. In general, the moment of inertia reflects the maximum bending deformation that an object can withstand, and the bending modulus reflects the degree to which the material can withstand bending without breaking. Suppose the number of metal trusses in a certain direction is N x , then the moment of inertia and bending modulus of the electromagnetic window in this direction are The proportion of thick trusses in the variable-section electromagnetic window is λ=1 / 3, and the proportion of thin trusses is 1-λ. Then the moment of inertia and bending modulus of the variable-section electromagnetic window are: Right now The moment of inertia and bending modulus of the electromagnetic window with uniform cross section are: Available Through calculation and comparison, the moment of inertia and bending modulus of the variable-section electromagnetic window are better than those of the uniform-section electromagnetic window, which is more conducive to protecting the antenna system from the impact of extreme weather conditions such as typhoons, better serving the good operation of the antenna system, and extending its service life. Compared with the traditional electromagnetic window metal truss mode, the variable-section electromagnetic window not only reduces the insertion loss in electromagnetic performance, but also has a larger moment of inertia and bending modulus in mechanical performance. That is, the variable-section electromagnetic window has achieved optimization effects in both electromagnetic and mechanical properties, and is a feasible solution for designing and improving the comprehensive mechanical and electrical performance of electromagnetic windows.

[0028] Furthermore, based on the above content, an embodiment of the present invention also provides an antenna system operation performance simulation method, which specifically includes the following content:

[0029] A combined model for simulation testing is constructed, the combined model comprising: an antenna model and a variable-section electromagnetic window model, wherein the antenna model adopts a Cassegrain antenna model, and the variable-section electromagnetic window model forms an irregular pseudo-random distribution electromagnetic window model by adopting trusses of different widths;

[0030] The performance of the combined model was simulated using the three-dimensional full-wave electromagnetic simulation software FEKO. The simulation test model can be found in Figures 4 to 7 As shown in the figure, in order to further reduce the complexity of solving the electromagnetic properties of electrically large objects, the MOM algorithm is used as the basic algorithm, the multi-layer fast multipole algorithm is reasonably used, and the high-frequency algorithm is combined to greatly improve the calculation speed and reduce the demand for memory while ensuring accuracy.

[0031] As the antenna system operation performance simulation method in the embodiment of the present invention, further, parameters can be set according to specific requirements of different frequencies (such as far field, segmentation accuracy, solution range, etc.).

[0032] As a method for simulating the operating performance of an antenna system in an embodiment of the present invention, further, during the simulation process, the distribution of trusses within the antenna aperture of the antenna model is changed by performing an angle rotation transformation on the variable cross-section electromagnetic window model, so as to eliminate the influence of the distribution of trusses within the antenna aperture on the simulation result. Further, based on the simulation data at each rotation transformation angle of the variable cross-section electromagnetic window model, a more effective calculation result is obtained by taking the average value.

[0033] In order to verify the effectiveness of this solution, the following is a further explanation based on specific simulation data:

[0034] The Cassegrain antenna used has a main reflector diameter of 3 meters and a secondary reflector diameter of 0.3 meters. The metal truss electromagnetic window adopts pseudo-random distribution, with a diameter of 5.2 meters. The metal truss width of the electromagnetic window with a uniform cross-section is 2.667 cm, and the aspect ratio is 3; the metal truss width of the electromagnetic window with a variable cross-section is 2 cm and 4 cm, and the aspect ratio is 3.

[0035] The C-band frequency mainly covers 4.0GHz to 8.0GHz. Due to its low frequency, it is not easily affected by rain attenuation and is suitable for carrying downlink signals of various small satellite ground stations. Therefore, it has been widely used for a long time. Its downlink band is 3.7GHz to 4.2GHz. Taking 4.2GHz as an example, the gain of the antenna system itself is 39.4886dB, the average gain after installing the equal-section electromagnetic window is 37.94108dB, and the gain of the entire system after installing the variable-section electromagnetic window is 38.01886dB. Relatively speaking, the insertion loss of the variable-section electromagnetic window to the antenna is 0.07778dB lower than that of the equal-section electromagnetic window. Table 1 shows the electrical performance indicators of the C-band equal-section and variable-section electromagnetic windows.

[0036] Table 1

[0037]

[0038]

[0039] From the simulation results, it can be seen that the electromagnetic performance of the variable cross-section MSF electromagnetic window is not as good as that of the equal cross-section MSF electromagnetic window below 4GHz, and the optimization effect weakens above 4.2GHz, and it is in a reasonable optimization range in the C band. The variable cross-section structure enables the metal truss electromagnetic window to exhibit better electromagnetic performance in some frequency bands. Combined with the improvement of mechanical properties, the variable cross-section electromagnetic window is a better choice for both mechanical and electrical optimization compared to the equal cross-section electromagnetic window, which can better serve the good operation of the antenna system.

[0040] The term "and / or" in this article indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" relationship.

[0041] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate a quantity restriction. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not defined as physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The exemplary embodiments of the present invention are described in detail above with reference to the preferred embodiments. However, it will be appreciated by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various combinations of the various technical features and structures proposed in the present invention may be made without exceeding the scope of protection of the present invention, which is determined by the appended claims. The foregoing description of the specific exemplary embodiments of the present invention is not intended to limit the present invention to the precise form disclosed, and it is obvious that many changes and variations may be made according to the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention and various different choices and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for improving the operating performance of an antenna system, wherein a metal electromagnetic window is used as a protective cover for the antenna system, and the scattering effect between each truss of the electromagnetic window affects the electromagnetic performance of the antenna system through superposition. It is characterized in that The metal electromagnetic window adopts a variable-section electromagnetic window structure, wherein the variable-section electromagnetic window structure forms an irregular pseudo-random distribution truss by using trusses of different widths; The pseudo-random distribution trusses of the electromagnetic window are used to offset the scattering effect between the trusses of the electromagnetic window; By offsetting the scattering effect between trusses, the impact on the electromagnetic performance of the antenna system is reduced, thereby improving the operating performance of the antenna system; The cross section of the variable-section electromagnetic window structure truss is composed of a plurality of variable-section hexagonal units, the sides of each variable-section hexagonal unit are connected by a truss rod at the head and tail, the diagonal of the variable-section hexagonal unit is composed of truss rod two, and the skin is arranged in a triangle formed by the diagonal and sides of the variable-section hexagonal unit; The widths of truss 1 and truss 2 are not equal; the width of truss 1 is greater than that of truss 2; a connection node for fixing truss 2 is arranged at the center of the variable-section hexagonal unit, and truss 2 forms three diagonals of the variable-section hexagonal unit through the connection node.

2. The method for improving the operating performance of an antenna system according to claim 1, It is characterized in that The impact of scattering effects on the electromagnetic performance of antenna systems includes but is not limited to: an increase in the sidelobe level and / or an increase in the sidelobe width.

3. The method for improving the operating performance of an antenna system according to claim 1 or 2, It is characterized in that The influence on the electromagnetic performance of the antenna system is reduced, including but not limited to: reducing the increase of the sidelobe level and / or the increase of the sidelobe level width by offsetting the scattering effect between the trusses.

4. The method for improving the operating performance of an antenna system according to claim 1, It is characterized in that The antenna system adopts a Cassegrain antenna structure. The electromagnetic wave is emitted by the feed source and irradiated onto the sub-reflector. It is reflected by the sub-reflector and then reflected by the main reflector as a parallel beam, which is then emitted directionally into free space.

5. A method for simulating the operation performance of an antenna system, It is characterized in that The simulation test for the method described in any one of claims 1 to 4 specifically includes the following contents: A combined model for simulation testing is constructed, the combined model comprising: an antenna model and a variable-section electromagnetic window model, wherein the antenna model adopts a Cassegrain antenna model, and the variable-section electromagnetic window model forms an irregular pseudo-random distribution electromagnetic window model by adopting trusses of different widths; The performance of the combined model is simulated using three-dimensional full-wave electromagnetic simulation software, and the simulation parameter settings are adjusted according to the experimental frequency during the simulation process.

6. The antenna system operation performance simulation method according to claim 5, It is characterized in that During the simulation process, the distribution of trusses within the antenna aperture of the antenna model is changed by performing an angle rotation transformation on the variable-section electromagnetic window model to eliminate the influence of the distribution of trusses within the antenna aperture on the simulation results.

7. The antenna system operation performance simulation method according to claim 6, It is characterized in that According to the simulation data of the variable cross-section electromagnetic window model at each rotation transformation angle, the final simulation result is obtained by taking the average value.

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