A dual wave beam splitting structure

Abstract

The application belongs to the technical field of electromagnetic wave and acoustic wave regulation, and provides a double-wave beam splitting structure. The double-wave beam splitting structure is passive, can regulate the energy distribution ratio of the split beams, and has the same splitting effect on electromagnetic waves and acoustic waves. The double-wave beam splitting structure comprises a tubular structure formed by a plurality of concentric circular-arc metal plate arrays. The extension line of the incident end of the cross section of the tubular structure is a first extension line, and the first extension line points to the center of the circle. The extension line of the exit end of the cross section of the tubular structure is a second extension line. The angle between the perpendicular line of the first extension line and the second extension line is an exit surface tangent angle. In the direction away from the center of the circle, the arc length of the metal plate gradually increases. The spacing between adjacent metal plates is equal. The application has a simple structure, can simultaneously produce the same splitting effect on electromagnetic waves and acoustic waves, and only needs a metal plate array to achieve the effect, without the need for complex materials and artificial media. The energy distribution ratio of the two exit beams can be regulated by adjusting the exit surface tangent angle and the incident angle of the incident wave.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic wave and acoustic wave control technology, and specifically relates to a dual-beam splitting structure. Background Technology

[0002] Wavelength beam splitting (WBS) structures can split an incident wave (proportional electromagnetic wave or sound wave) into two or more outgoing waves. Low-frequency electromagnetic wave beam splitting structures can be used for signal decomposition in radio frequency circuits, spatial power distribution in two-port antennas, and electromagnetic interferometers. Sound wave beam splitting structures can be used for signal decomposition in acoustic networks / circuits, acoustic power splitting, and acoustic interferometers.

[0003] However, current electromagnetic wave or sound wave beam splitting structures can only effectively distribute a single type of wave, and usually require an external energy supply to adjust the energy ratio of the two output waves after splitting. Therefore, there is still a lack of a passive dual-wave beam splitting structure that can adjust the energy ratio of the split waves and produce the same beam splitting effect for both electromagnetic waves and sound waves. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems in the prior art, the present invention provides a dual-wavelength beam splitting structure.

[0005] The present invention is achieved by the following technical solution: a dual-wavelength beam splitting structure, comprising a tubular structure formed by an array of multiple concentric arc-shaped metal plates, wherein the extension line of the incident end of the cross-section of the tubular structure is the first extension line, and the first extension line points to the center of the circle; the extension line of the exit end of the cross-section of the tubular structure is the second extension line, and the angle between the perpendicular line of the first extension line and the second extension line is the tangent angle of the exit surface; the arc length of the metal plates gradually increases along the direction away from the center of the circle; the spacing between adjacent metal plates is equal, and air is filled between adjacent metal plates.

[0006] Preferably, the spacing between adjacent metal plates is less than or equal to 1 / 2 of the incident wave wavelength.

[0007] Preferably, the incident aperture of the tubular structure cross-section is equal to the product of the number of metal plates and the distance between adjacent metal plates, and the incident aperture is larger than the cross-sectional size of the incident wave.

[0008] Preferably, the thickness of the metal plate is less than or equal to the spacing between adjacent metal plates.

[0009] Preferably, the metal plate is made of a material with high electrical conductivity.

[0010] Preferably, the arc length of the metal plate is less than 1 / 4 of the circumference of the circle in which it is located.

[0011] Preferably, the height of the metal plate is greater than the wavelength of the incident wave.

[0012] Preferably, the tubular structure is formed by cutting an array of arc-shaped metal plates with the same center and central angle but different radii at a preset angle on the exit surface, and the corresponding exit surface cutting angle after cutting is α; the energy distribution ratio of the exit wave of the dual-wave beam splitter structure is controlled by adjusting the exit surface cutting angle α and the incident angle θ of the incident wave.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention has a simple structure and can produce the same beam splitting effect for both electromagnetic waves and sound waves simultaneously. It can be achieved with only a metal plate array, without the need for complex materials or artificial media. The energy distribution ratio of the two outgoing waves can be controlled by adjusting the chamfer angle of the outgoing surface and the incident angle of the incident wave. This structure can be used in applications such as dual-wave interferometers and dual-wave power dividers. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the cross-section of the dual-wavelength beam splitter structure in this embodiment;

[0017] Figure 2 This is a three-dimensional structural diagram of the dual-wavelength beam splitting structure in this embodiment;

[0018] Figure 3 The electromagnetic wave numerical simulation results of the dual-wavelength beam splitter structure in this embodiment are: grayscale image of magnetic field amplitude distribution (normal incidence).

[0019] Figure 4 The following is a grayscale image (normal incidence) of the sound pressure amplitude distribution of the dual-wavelength beam splitting structure in this embodiment.

[0020] Figure 5 The electromagnetic wave numerical simulation results of the dual-wavelength beam splitter structure in this embodiment are: grayscale image of magnetic field amplitude distribution (incident angle 5 degrees).

[0021] Figure 6 The following is a grayscale image of the sound pressure amplitude distribution (incident angle 5 degrees) of the dual-wavelength beam splitting structure in this embodiment.

[0022] Figure 7 This is the relationship between the transmittance and the incident angle of the two outgoing waves generated by the dual-wavelength splitter structure in this embodiment.

[0023] Figure 8This describes the relationship between the transmittance of the two outgoing waves generated by the dual-wavelength splitter structure and the tangent angle of the outgoing surface under normal incidence conditions in this embodiment.

[0024] In the diagram: 1-metal plate; 1.2-air; 1.3-incident surface; 1.4-exit surface; 1.5-first extension line; 1.6-second extension line. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should fall within the scope of the technical content disclosed in the present invention. It should be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0027] This invention provides an embodiment:

[0028] like Figure 1 As shown, a dual-wavelength beam splitting structure includes a tubular structure formed by an array of multiple concentric arc-shaped metal plates 1.1. The extension line of the incident end of the cross-section of the tubular structure is a first extension line 1.5, which points towards the center of the circle. The extension line of the exit end of the cross-section of the tubular structure is a second extension line 1.6, and the angle between the perpendicular line of the first extension line 1.5 and the second extension line 1.6 is the exit surface tangent angle α. Along the direction away from the center of the circle, the arc length of the metal plate 1.1 gradually increases. The spacing between adjacent metal plates 1.1 is equal, and air 1.2 is filled between adjacent metal plates 1.1.

[0029] The distance between adjacent metal plates 1.1 is less than or equal to 1 / 2 of the wavelength of the incident wave; the thickness of metal plate 1.1 is less than or equal to the distance between adjacent metal plates 1.1; the arc length of metal plate 1.1 is less than 1 / 4 of the circumference of the circle in which it is located; and the height of metal plate 1.1 is greater than the wavelength of the incident wave.

[0030] The incident aperture of the tubular structure cross-section is equal to the product of the number of metal plates 1.1 and the distance between adjacent metal plates 1.1, and the incident aperture is larger than the cross-sectional size of the incident wave.

[0031] The specific dimensions of the tubular structure can be determined based on the wavelength of the incident wave, the cross-sectional dimensions, the required beam splitting energy ratio, and the amount of space reserved for the device.

[0032] In this embodiment, the working wavelengths of the electromagnetic waves and sound waves are designed to be 4cm, corresponding to electromagnetic waves at 7.5GHz and sound waves at 8575Hz, respectively. The material of the metal plate 1.1 can be a high-conductivity material such as copper, aluminum, or gold; copper is used in this embodiment. The tubular structure is an array of a series of arc-shaped metal plates 1.1 with the same center but different radii and central angles. It can be obtained by cutting arc-shaped metal plates 1.1 with the same center and different radii of central angles at a preset angle on the exit surface. The cut angle of the exit surface after cutting is α; the range of the cut angle α is between 20 and 40 degrees. In this embodiment, there are a total of 21 metal plate 1.1 arrays. The thickness of the metal plate 1.1 is designed to be 0.04cm, and the height is designed to be 20cm. The exit surface tangent angle α = 32°; the arc lengths of the multiple metal plates 1.1 from the inside out are 41.888cm, 42.895cm, 43.902cm, 44.909cm, 45.916cm, 46.923cm, 47.930cm, 48.937cm, 49.944cm, 50.951cm, 51.958cm, 52.965cm, 53.972cm, 54.979cm, 55.986cm, 56.994cm, 58.001cm, 59.008cm, 60.015cm, 61.022cm, and 62.029cm, respectively. The width of the air gap between adjacent metal plates 1.1 is 1cm and the height is 20cm.

[0033] When the structure is in operation, it is placed in free space. Electromagnetic waves or sound waves of the same wavelength (or both waves simultaneously) are incident on the incident surface of the structure, and two outgoing waves are generated on its exit surface.

[0034] When an electromagnetic wave is incident on the incident surface 1.3 of the structure, two beams of split electromagnetic waves with transmittances of 51.94% and 48.06% will exit from the exit surface 1.4 of the structure. Figure 2 This is the magnetic field amplitude distribution in the numerical simulation under this condition.

[0035] Similarly, when the sound wave is incident on the incident surface 1.3 of the structure, the two beams of sound wave with transmittance of 51.94% and 48.06% will exit from the exit surface 1.4 of the structure. Figure 3 This is the numerical simulation of the sound pressure amplitude distribution under this condition.

[0036] pass Figure 2 and Figure 3 The simulation results show that both electromagnetic waves and sound waves can produce the same beam splitting effect when incident on the dual-wave beam splitting structure proposed in this invention.

[0037] like Figure 5 , Figure 6 To keep the above conditions unchanged, the incident angle θ of the incident wave is changed and set to 5 degrees. After the electromagnetic wave and the sound wave are incident on the dual-wave beam splitting structure proposed in this invention, the magnetic field amplitude distribution and sound pressure amplitude distribution are numerically simulated.

[0038] The energy distribution ratio of the emitted waves in the dual-wavelength beam splitter structure is controlled by adjusting the tangent angle α of the emitted surface and the incident angle θ of the incident waves. Specifically, the dual-wavelength beam splitter structure proposed in this invention can easily change the transmittance of the two emitted waves by altering the incident angle θ of the incident waves. The specific relationship is determined by... Figure 7 The following is given; simultaneously, under normal incidence conditions, the transmittance of the two outgoing waves can be controlled by changing the tangent angle α of the exit surface. The specific relationship is given by... Figure 8 Provided.

[0039] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A dual wave beam splitting structure, characterized by: The tubular structure comprises a plurality of concentric circular arc-shaped metal plate arrays, the extension line of the incident end of the cross section of the tubular structure is a first extension line, the first extension line points to the center of the circle, the extension line of the exit end of the cross section of the tubular structure is a second extension line, and the included angle between the perpendicular line of the first extension line and the second extension line is an exit surface tangent angle; the arc length of the metal plate gradually increases in the direction away from the center of the circle; the spacing between adjacent metal plates is equal, and air is filled between the adjacent metal plates. The tubular structure is formed by cutting a circular arc-shaped metal plate array with the same center, a center angle and different radii at a preset angle on the exit surface, and the corresponding exit surface tangent angle after cutting is a; the energy distribution ratio of the exit wave of the double-wave beam splitting structure is controlled by adjusting the exit surface tangent angle a and the incident angle θ of the incident wave.

2. The dual wave beam splitting structure according to claim 1, characterized in that: The spacing between the adjacent metal plates is less than or equal to 1 / 2 of the wavelength of the incident wave.

3. The dual wave beam splitting structure according to claim 1, characterized in that: The incident aperture of the cross section of the tubular structure is equal to the product of the number of metal plates and the spacing between adjacent metal plates, and the incident aperture is greater than the cross-sectional size of the incident wave.

4. The dual wave beam splitting structure according to claim 1, characterized in that: The thickness of the metal plate is less than or equal to the spacing between adjacent metal plates.

5. The dual wave beam splitting structure according to claim 1, characterized in that: The material of the metal plate is a high-conductivity material.

6. The dual wave beam splitting structure according to claim 1, characterized in that: The arc length of the metal plate is less than 1 / 4 of the arc length of the circumference in which the metal plate is located.

7. The dual wave beam splitting structure according to claim 1, characterized in that: The height of the metal plate is greater than the wavelength of the incident wave.

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