Narrowband angle selection surface structure with adjustable wave transmission angle

Abstract

The invention provides a narrow-band angle selective surface structure with an adjustable wave transmission angle, and relates to the technical field of electromagnetic fields and electromagnetic waves. Comprising a plurality of unit structures which are periodically arranged and are connected with one another; each unit structure comprises a metal layer, a non-closed gap and a dielectric substrate; a metal layer is arranged on the upper surface of the dielectric substrate, and a non-closed gap is arranged in the metal layer far away from one side of the upper surface of the dielectric substrate. Thus, when electromagnetic waves at different angles are incident, the electromagnetic waves within a specific angle range are transmitted through the non-closed gap, the metal layer reflects incident electromagnetic waves at other angles, angle selectivity is achieved, multi-frequency-point regulation and control can be achieved, and the small incident angle range of the wave-transmitting electromagnetic waves can be controlled; the narrow-band angle selection surface structure only comprises the metal layer, the dielectric substrate and the non-closed gap formed in the metal layer, a complex structure is not needed, the thickness of the unit structure is small, and accurate adjustment of different angles is achieved in the dynamic and complex electromagnetic environment.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic fields and electromagnetic waves, and in particular to a narrowband angle selective surface structure with adjustable wave transmission angle. Background Art

[0002] An Angle Selective Surface (ASS) is an angle selective structure proposed based on a Frequency Selective Surface (FSS). The essence of ASS is a periodic surface composed of specific unit structures arranged in a specific order. ASS can exhibit reflection or transmission characteristics at specific angles, acting as a spatial filter. The application scenarios of ASS and FSS are similar, and both can be applied to radomes to achieve corresponding performances by loading ASS with different performances. The basic composition of ASS is composed of periodically arranged unit cells, and each cell has a certain geometric shape and electromagnetic characteristics. By precisely designing the size, shape, arrangement, and material properties of these cells, ASS can exhibit significant reflection or transmission characteristics at specific incident angles. These characteristics are similar to those of a spatial filter, which can effectively filter or suppress electromagnetic waves from a specific direction while maintaining a low reflection or transmission rate in other directions. Generally speaking, as a new type of electromagnetic control structure, ASS not only expands the application scope of FSS but also provides new ideas and technical means for fields such as antenna design and wireless communication. With the continuous improvement of its design theory and manufacturing process, ASS is expected to play an increasingly important role in high-tech fields such as future communication, radar, and satellite systems.

[0003] Three factors in the study of electromagnetic periodic structures have received much attention, namely frequency, polarization, and angle. There have been relatively more studies on frequency and polarization, but the research on angle selective surfaces is still insufficient. ASS can allow electromagnetic waves to be transmitted from certain angles while blocking electromagnetic waves from other angles, thus achieving angle selectivity. ASS plays an important role in practical applications, such as spatial filters, suppressing antenna side lobes, improving signal-to-noise ratio to resist interference, and controlling angles. Although ASS has great application potential in electromagnetic wave regulation, current research still faces several challenges, especially in meeting the angle selectivity requirements of complex environments in practical applications. The research on ASS in the prior art mainly focuses on the angle selectivity adjustment at a specific frequency point, usually by designing cells with a specific periodic structure to achieve the transmission of electromagnetic waves at certain specific angles. However, in the prior art, the thickness of the cell structure is relatively large, and it focuses on the wave transmission ability at specific frequency points and specific angles. At the same time, the range of wave transmission angles is relatively large, and it often cannot meet the demand for precise adjustment of different angles in a dynamic and complex electromagnetic environment. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a narrowband angle selection surface structure with adjustable wave transmission angle, which solves the problems in the prior art that multi-frequency point regulation cannot be achieved, the wave transmission angle is relatively large, and the unit structure is relatively thick, and cannot meet the requirements of precise adjustment at different angles in dynamic and complex electromagnetic environments.

[0005] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] The present invention provides a narrowband angle selection surface structure with adjustable wave transmission angle, including: a plurality of unit structures arranged periodically, and the plurality of unit structures are connected to each other; each of the plurality of unit structures includes a metal layer, an unclosed slit, and a dielectric substrate; a metal layer is provided on the upper surface of the dielectric substrate, and an unclosed slit is provided in the metal layer on the side away from the upper surface of the dielectric substrate.

[0007] In some embodiments, the unclosed slit includes a rectangular ring-shaped slit and two rectangular slits connected to each other.

[0008] In some embodiments, the plurality of unit structures are arranged along the length direction of the two rectangular slits.

[0009] In some embodiments, the geometric center of the rectangular ring-shaped slit coincides with the geometric center of the metal layer; the two rectangular slits include a first rectangular slit and a second rectangular slit, and the second rectangular slit is symmetrically arranged with respect to the first rectangular slit;

[0010] One end of the first rectangular slit is connected to the first midpoint of one side of the rectangular ring-shaped slit, and the first rectangular slit extends from the first midpoint to one end edge of the metal layer, and the other end of the first rectangular slit is connected to one end of the second rectangular slit in the adjacent first unit structure;

[0011] One end of the second rectangular slit is connected to the second midpoint, and the second rectangular slit extends from the second midpoint to the other end edge of the metal layer, and the other end of the second rectangular slit is connected to one end of the first rectangular slit in the adjacent second unit structure, and the second midpoint is the midpoint of the other side parallel to one side of the rectangular ring-shaped slit.

[0012] In some embodiments, the thickness of the metal layer ranges from 0.017 mm to 0.035 mm.

[0013] In some embodiments, the thickness of the dielectric substrate ranges from 0.5 mm to 0.7 mm.

[0014] In some embodiments, the ring width of the rectangular annular slit, the width of the first rectangular slit, and the width of the second rectangular slit are all the same, the length of the first rectangular slit and the length of the second rectangular slit are the same, and the length of each side of the rectangular annular slit is different from the length of the first rectangular slit and the length of the second rectangular slit respectively.

[0015] In some embodiments, the range of the ring width of the rectangular annular slit and the widths of the two rectangular slits is both 0.3 mm - 0.5 mm.

[0016] In some embodiments, the range of the side length of the outer ring of the rectangular annular slit is 6 mm - 9 mm, the range of the side length of the inner ring of the rectangular annular slit is 6 mm - 7 mm, and the range of the lengths of the two rectangular slits is both 1 mm - 2 mm.

[0017] In some embodiments, the material of the metal layer is copper, the material of the dielectric substrate is glass, the relative dielectric constant of the glass is 5.5, the tangent loss is 0, and the density is 2500 kg / m 3 。

[0018] Compared with the prior art, a narrowband angle selection surface structure with adjustable transmission angle provided by the present invention includes: a plurality of unit structures arranged periodically, and the plurality of unit structures are connected to each other; each of the plurality of unit structures includes a metal layer, an unclosed slit, and a dielectric substrate; a metal layer is provided on the upper surface of the dielectric substrate, and an unclosed slit is provided in the metal layer on the side away from the upper surface of the dielectric substrate. In this way, when electromagnetic waves of different angles are incident, electromagnetic waves within a specific angle range are transmitted through the unclosed slit, and the incident electromagnetic waves at other angles are reflected by the metal layer, so that angle selectivity is achieved, multi-frequency point regulation can be realized, and the range of the smaller incident angle of the transmitted electromagnetic waves can be controlled, so that the transmission angle is smaller; the narrowband angle selection surface structure with adjustable transmission angle only includes a metal layer and a dielectric substrate stacked, and an unclosed slit provided in the metal layer, without the need for a more complex structure, so that the thickness of the unit structure is relatively thin. The narrowband angle selection surface structure with adjustable transmission angle can adapt to the requirements of the incident angle of the transmitted wave in different environments, and meet the needs of precise adjustment of different angles in a dynamic and complex electromagnetic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0020] Figure 1 A three-dimensional example diagram of the narrowband angle selection surface structure with adjustable transmission angle is schematically shown;

[0021] Figure 2 Schematically shows a three-dimensional example diagram of one unit structure among a plurality of periodically arranged unit structures;

[0022] Figure 3 Schematically shows a front view of a narrowband angle selection surface structure with adjustable wave transmission angle;

[0023] Figure 4 Schematically shows a schematic diagram of the dimensions of the metal layer and the non-closed slit of the narrowband angle selection surface structure with adjustable wave transmission angle;

[0024] Figure 5 Schematically shows a simulation diagram of the scattering parameters (S-parameters) of electromagnetic waves with different incident angles when the incident wave is a transverse electric (TE) wave on the narrowband angle selection surface structure with adjustable wave transmission angle;

[0025] Figure 6 Schematically shows a simulation diagram of the S-parameters of the narrowband angle selection surface structure with adjustable wave transmission angle when the incident wave is a TE wave and the operating frequency points are different.

[0026] Description of reference numerals:

[0027] 1. Metal layer; 2. Non-closed slit; 21. Rectangular ring-shaped slit; 22. Two rectangular slits; 221. First rectangular slit; 222. Second rectangular slit; 3. Dielectric substrate. Detailed implementation manners

[0028] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following detailed description of the embodiments and the drawings are used to exemplarily illustrate the principle of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms, is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

[0029] The following details a narrowband angle selection surface structure with adjustable wave transmission angle in an embodiment of the present invention.

[0030] Refer to Figure 1 as shown in Figure 1 Schematically shows a three-dimensional example diagram of the narrowband angle selection surface structure with adjustable wave transmission angle. An embodiment of the present invention proposes a narrowband angle selection surface structure with adjustable wave transmission angle, including: a plurality of unit structures arranged periodically, and the plurality of unit structures are connected to each other; each of the plurality of unit structures includes a metal layer 1, a non-closed slit 2, and a dielectric substrate 3; a metal layer 1 is disposed on the upper surface of the dielectric substrate 3, and a non-closed slit 2 is disposed in the metal layer 1 on the side far from the upper surface of the dielectric substrate 3.

[0031] Specifically, multiple unit structures are arranged in a square periodic pattern. The metal layer 1 and the dielectric substrate 3 completely overlap. Both the metal layer 1 and the dielectric substrate 3 are cuboids, and the shapes of the upper and lower surfaces of the metal layer 1 and the dielectric substrate 3 are both squares, and the side lengths of the upper and lower surfaces of the metal layer 1 and the dielectric substrate 3 are the same.

[0032] Specifically, when electromagnetic waves of different angles are incident, the non-closed slit 2 only allows electromagnetic waves within a specific angle range to pass through, and the incident electromagnetic waves at other angles outside the specific angle range are reflected by the metal layer 1. By changing the operating frequency, the incident angles of the electromagnetic waves allowed to pass through by the corresponding non-closed slit 2, and the incident angles of the electromagnetic waves reflected by the metal layer 1 also change. By adjusting the operating frequency, the incident angle range of the transmitted electromagnetic waves and the incident angle range of the reflected electromagnetic waves can be adjusted, and at the same time, the metal layer 1 and the non-closed slit 2 can control the incident angle range of the transmitted electromagnetic waves within a relatively small range.

[0033] When the transmission coefficient (S21) is greater than -3 dB and the operating frequency is 11.3 GHz, the incident angles of the transmitted electromagnetic waves are 0 - 4°; when the operating frequency is 10.85 GHz, the incident angles of the transmitted electromagnetic waves are 8 - 23°; when the operating frequency is 10.3 GHz, the incident angles of the transmitted electromagnetic waves are 28 - 35°; when the operating frequency is 10.05 GHz, the incident angles of the transmitted electromagnetic waves are 36 - 42°; when the operating frequency is 9.7 GHz, the incident angles of the transmitted electromagnetic waves are 48 - 52°; when the operating frequency is 9.45 GHz, the incident angles of the transmitted electromagnetic waves are 57 - 62°; when the operating frequency is 9.3 GHz, the incident angles of the transmitted electromagnetic waves are 67 - 72°.

[0034] In one embodiment, multiple unit structures are arranged along the length directions of two rectangular slits 22.

[0035] Figure 2 A three-dimensional example diagram of one unit structure among the periodically arranged multiple unit structures is schematically shown. Figure 3 A front view of the narrowband angle selection surface structure with adjustable wave transmission angles is schematically shown. Refer to Figure 2 and Figure 3 As shown, multiple unit structures are all the same. Multiple unit structures all include a metal layer 1, a non-closed slit 2, and a dielectric substrate 3. The metal layer 1 and the dielectric substrate 3 are stacked. The metal layer 1 is disposed on the upper surface of the dielectric substrate 3, and the non-closed slit 2 is disposed in the metal layer 1 on the side away from the upper surface of the dielectric substrate 3.

[0036] Refer to Figure 2As shown, in one embodiment, the non-closed slot 2 includes a rectangular ring-shaped slot 21 and two rectangular slots 22 connected to each other. The geometric center of the rectangular ring-shaped slot 21 coincides with the geometric center of the metal layer 1; the two rectangular slots 22 include a first rectangular slot 221 and a second rectangular slot 222, and the second rectangular slot 222 is symmetrically arranged with respect to the first rectangular slot 221. One end of the first rectangular slot 221 is connected to the first midpoint of one side of the rectangular ring-shaped slot 21, and the first rectangular slot 221 extends from the first midpoint to one end edge of the metal layer 1. The other end of the first rectangular slot 221 is connected to one end of the second rectangular slot 222 in the adjacent first unit structure. One end of the second rectangular slot 222 is connected to the second midpoint, and the second rectangular slot 222 extends from the second midpoint to the other end edge of the metal layer 1. The other end of the second rectangular slot 222 is connected to one end of the first rectangular slot 221 in the adjacent second unit structure. The second midpoint is the midpoint of the other side of the rectangular ring-shaped slot 21 parallel to one side.

[0037] Specifically, the centers of the dielectric substrate 3, the metal layer 1, and the non-closed slot 2 coincide. The external shape of the non-closed slot 2 is polygonal. The first unit structure and the second unit structure have the same structure but different positions.

[0038] Multiple unit structures are arranged in a square periodic pattern. Among them, multiple unit structures are arranged along the length direction of the two rectangular slots 22, and multiple unit structures are also arranged along the direction perpendicular to the length direction of the two rectangular slots 22. That is to say, multiple unit structures are also arranged along the width direction of the two rectangular slots 22, so that multiple unit structures can be arranged in a square periodic pattern.

[0039] In the narrowband angle selection surface structure with adjustable transmission angle, there are multiple unit structures in the middle position and multiple unit structures in the edge position. The other end of the first rectangular slot 221 of the multiple unit structures in the middle position is connected to one end of the second rectangular slot 222 in the adjacent first unit structure; the other end of the second rectangular slot 222 of the multiple unit structures in the middle position is connected to one end of the first rectangular slot 221 in the adjacent second unit structure. For the multiple unit structures in the edge position, only the other end of one of the two rectangular slots 22 needs to be connected to one end of one rectangular slot in the adjacent unit structure.

[0040] In one embodiment, the material of the metal layer 1 is copper, the material of the dielectric substrate 3 is glass, the relative dielectric constant of the glass is 5.5, the tangent loss is 0, and the density is 2500 kg / m 3 .

[0041] In one embodiment, the ring width of the rectangular annular slit 21, the width of the first rectangular slit 221, and the width of the second rectangular slit 222 are all the same, the length of the first rectangular slit 221 and the length of the second rectangular slit 222 are the same, and the length of each side of the rectangular annular slit 21 is different from the length of the first rectangular slit 221 and the length of the second rectangular slit 222 respectively.

[0042] Figure 4 Schematically shown is a dimension marking schematic diagram of the metal layer 1 and the non-closed slit 2 of the narrowband angle selection surface structure with adjustable wave transmission angle. See Figure 4 As shown, the shapes of the upper and lower surfaces of the metal layer 1 and the dielectric substrate 3 are both square, and the side lengths of the upper and lower surfaces of the metal layer 1 and the dielectric substrate 3 are the same. The range of the side lengths of the upper and lower surfaces of the metal layer 1 and the dielectric substrate 3 is 9 mm - 11 mm. The range of the thickness of the metal layer 1 is 0.017 mm - 0.035 mm. Preferably, the mutually perpendicular side lengths P and Q of the metal layer 1 are both 10 mm, and the side length of the dielectric substrate 3 is also 10 mm. The range of the thickness of the dielectric substrate 3 is 0.5 mm - 0.7 mm. Preferably, the thickness of the dielectric substrate is 0.6 mm.

[0043] See Figure 4 As shown, the ring width of the rectangular annular slit 21 is denoted as s2, and the widths of the first rectangular slit 221 and the second rectangular slit 222 are both denoted as s1. The ring width s2 of the rectangular annular slit 21, the width s1 of the first rectangular slit 221, and the width s1 of the second rectangular slit 222 are all the same. The range of the ring width s2 of the rectangular annular slit 21, the width s1 of the first rectangular slit 221, and the width s1 of the second rectangular slit 222 is 0.3 mm - 0.5 mm. The side length of the outer ring of the rectangular annular slit 21 is denoted as w1, and the range of the side length w1 of the outer ring of the rectangular annular slit 21 is 6 mm - 9 mm. The side length of the inner ring of the rectangular annular slit 21 is denoted as w2, and the range of the side length w2 of the inner ring of the rectangular annular slit 21 is 6 mm - 7 mm. The lengths of the first rectangular slit 221 and the second rectangular slit 222 are both denoted as w3, and the range of the lengths w3 of the first rectangular slit 221 and the second rectangular slit 222 is 1 mm - 2 mm. Preferably, the ring width s2 of the rectangular annular slit 21, the width s1 of the first rectangular slit 221, and the width s1 of the second rectangular slit 222 are all 0.4 mm, the side length w1 of the outer ring of the rectangular annular slit 21 is 7 mm, the side length w2 of the inner ring of the rectangular annular slit 21 is 6.2 mm, and the lengths w3 of the first rectangular slit 221 and the second rectangular slit 222 are both 1.5 mm.

[0044] To verify the performance of a narrowband angle-selective surface structure with adjustable wave-transmitting angle provided by the present invention, simulation software is used for simulation. First, the simulation conditions are set. Among them, the thickness of the metal layer 1 ranges from 0.017 mm to 0.035 mm, the thickness of the dielectric substrate 3 is 0.6 mm, the external shape of the non-closed slit 2 is a rectangular ring connecting two rectangles, the ring width s2 of the rectangular ring slit 21, the width s1 of the first rectangular slit 221, and the width s1 of the second rectangular slit 222 are all 0.4 mm, the side length w1 of the outer ring of the rectangular ring slit 21 is 7 mm, the side length w2 of the inner ring of the rectangular ring slit 21 is 6.2 mm, and the lengths w3 of the first rectangular slit 221 and the second rectangular slit 222 are both 1.5 mm.

[0045] Figure 5 Schematically shows the S-parameter simulation diagrams of electromagnetic waves with different incident angles when the incident wave is a TE wave for the narrowband angle-selective surface structure with adjustable wave-transmitting angle. Figure 5 It is the S-parameter simulation diagram of the narrowband angle-selective surface structure with adjustable wave-transmitting angle when TE-polarized waves with different incident angles are incident within the working frequency range of 7.5 GHz to 12.5 GHz. Figure 5 In it, the abscissa is the frequency, that is, the working frequency, the unit of the working frequency is GHz, the ordinate is the S parameter, the unit of the S parameter is dB. The black line is the transmission coefficient curve when the incident angle is 0° within the working frequency range of 7.5 GHz to 12.5 GHz; the red line is the transmission coefficient curve when the incident angle is 10° within the working frequency range of 7.5 GHz to 12.5 GHz; the dark blue line is the transmission coefficient curve when the incident angle is 20° within the working frequency range of 7.5 GHz to 12.5 GHz; the green line is the transmission coefficient curve when the incident angle is 30° within the working frequency range of 7.5 GHz to 12.5 GHz; the light purple line is the transmission coefficient curve when the incident angle is 40° within the working frequency range of 7.5 GHz to 12.5 GHz; the yellow line is the transmission coefficient curve when the incident angle is 50° within the working frequency range of 7.5 GHz to 12.5 GHz; the light blue line is the transmission coefficient curve when the incident angle is 60° within the working frequency range of 7.5 GHz to 12.5 GHz; the dark purple line is the transmission coefficient curve when the incident angle is 70° within the working frequency range of 7.5 GHz to 12.5 GHz; the yellow-green line is the transmission coefficient curve when the incident angle is 80° within the working frequency range of 7.5 GHz to 12.5 GHz. The range of the incident angle is from 0° to 80°, and the increment step is 10°. S21 refers to the transmission coefficient curve. Here, the TE-polarized wave refers to an incident wave in which the electric field vector E is perpendicular to the incident plane and the magnetic field vector H is parallel to the incident plane. Figure 5It can be seen that at different operating frequencies, the incident angles of the transmitted electromagnetic waves are different. Generally speaking, the lower the operating frequency, the larger the incident angle of the transmitted electromagnetic wave. This shows that the present invention has good angle selectivity, and the incident angle of the transmitted electromagnetic wave can be adjusted by adjusting the operating frequency, which can meet the requirements of spatial anti-interference in different environments.

[0046] Figure 6 Schematically shows the S-parameter simulation diagrams of the narrowband angle-selective surface structure with adjustable wave-transmitting angle when the incident wave is a TE wave and the operating frequencies are different. Figure 6 It is the S-parameter simulation diagram of the narrowband angle-selective surface structure with adjustable wave-transmitting angle when the incident electromagnetic wave has an incident angle range of 0 - 80° and TE-polarized waves with different frequencies are used. Figure 6 In it, the abscissa is the incident angle, the unit of the incident angle is deg, the ordinate is the S parameter, the unit of the S parameter is dB. The black line is the transmission coefficient curve when the incident electromagnetic wave has an incident angle range of 0 - 80° and the operating frequency is 11.3 GHz; the red line is the transmission coefficient curve when the incident electromagnetic wave has an incident angle range of 0 - 80° and the operating frequency is 10.85 GHz; the dark blue line is the transmission coefficient curve when the incident electromagnetic wave has an incident angle range of 0 - 80° and the operating frequency is 10.3 GHz; the green line is the transmission coefficient curve when the incident electromagnetic wave has an incident angle range of 0 - 80° and the operating frequency is 10.05 GHz; the light purple line is the transmission coefficient curve when the incident electromagnetic wave has an incident angle range of 0 - 80° and the operating frequency is 9.7 GHz; the yellow line is the transmission coefficient curve when the incident electromagnetic wave has an incident angle range of 0 - 80° and the operating frequency is 9.45 GHz; the light blue line is the transmission coefficient curve when the incident electromagnetic wave has an incident angle range of 0 - 80° and the operating frequency is 9.3 GHz.

[0047] See Figure 6 As shown, the operating frequencies are 11.3 GHz, 10.85 GHz, 10.3 GHz, 10.05 GHz, 9.7 GHz, 9.45 GHz, and 9.3 GHz respectively. From Figure 6As can be seen, when the operating frequency is 11.3 GHz and S21 is above -3 dB, the incident angle range of the transmitted electromagnetic wave is 0 - 4°. This indicates that the narrowband angle - selective surface structure with adjustable transmission angle provided by the present invention can transmit TE waves with incident angles in the range of 0 - 4° at an operating frequency of 11.3 GHz, while reflecting TE waves with other incident angle ranges except 0 - 4°. When the operating frequency is 10.85 GHz and S21 is above -3 dB, the incident angle range of the transmitted electromagnetic wave is 8 - 23°. This indicates that the narrowband angle - selective surface structure with adjustable transmission angle provided by the present invention can transmit TE waves with incident angles in the range of 8 - 23° at an operating frequency of 10.85 GHz, while reflecting TE waves with other incident angle ranges except 8 - 23°. When the operating frequency is 10.3 GHz and S21 is above -3 dB, the incident angle range of the transmitted electromagnetic wave is 28 - 35°. This indicates that the narrowband angle - selective surface structure with adjustable transmission angle provided by the present invention can transmit TE waves with incident angles in the range of 28 - 35° at an operating frequency of 10.3 GHz, while reflecting TE waves with other incident angle ranges except 28 - 35°. When the operating frequency is 10.05 GHz and S21 is above -3 dB, the incident angle range of the transmitted electromagnetic wave is 36 - 42°. This indicates that the narrowband angle - selective surface structure with adjustable transmission angle provided by the present invention can transmit TE waves with incident angles in the range of 36 - 42° at an operating frequency of 10.05 GHz, while reflecting TE waves with other incident angle ranges except 36 - 42°. When the operating frequency is 9.7 GHz and S21 is above -3 dB, the incident angle range of the transmitted electromagnetic wave is 48 - 52°. This indicates that the narrowband angle - selective surface structure with adjustable transmission angle provided by the present invention can transmit TE waves with incident angles in the range of 48 - 52° at an operating frequency of 9.7 GHz, while reflecting TE waves with other incident angle ranges except 48 - 52°. When the operating frequency is 9.45 GHz and S21 is above -3 dB, the incident angle range of the transmitted electromagnetic wave is 57 - 62°. This indicates that the narrowband angle - selective surface structure with adjustable transmission angle provided by the present invention can transmit TE waves with incident angles in the range of 57 - 62° at an operating frequency of 9.45 GHz, while reflecting TE waves with other incident angle ranges except 57 - 62°. When the operating frequency is 9.3 GHz and S21 is above -3 dB, the incident angle range of the transmitted electromagnetic wave is 67 - 72°. This indicates that the narrowband angle - selective surface structure with adjustable transmission angle provided by the present invention can transmit TE waves with incident angles in the range of 67 - 72° at an operating frequency of 9.3 GHz, while reflecting TE waves with other incident angle ranges except 67 - 72°.

[0048] Aiming at the problem that the existing ASS cannot achieve multi-band angle selection and has a relatively large wave-transmitting angle range, the present invention proposes a narrow-band angle selection surface structure with adjustable wave-transmitting angles. This structure can achieve angle selection at 7 different frequency points. For each frequency point, the wave-transmitting angles are different. Only the TE incident waves within a specific range can pass through at these frequency points, while the TE incident waves in other ranges are effectively reflected. At the same time, this structure can control the wave-transmitting incident angle range within a smaller range, thereby effectively reducing possible signal interference. Through fine adjustment of different frequency points, this structure can flexibly select different wave-transmitting angles in multiple frequency bands, thereby improving the anti-interference ability of the system. The angle selection characteristics of the present invention can be applied to radomes to enable signal transmission at specific angles while preventing communication interference at other angles, thus achieving spatial anti-interference.

[0049] A narrow-band angle selection surface structure with adjustable wave-transmitting angles according to an embodiment of the present invention includes: a plurality of unit structures arranged periodically, and the plurality of unit structures are connected to each other; each of the plurality of unit structures includes a metal layer 1, an unclosed slit 2, and a dielectric substrate 3; the metal layer 1 is disposed on the upper surface of the dielectric substrate 3, and the unclosed slit 2 is disposed in the metal layer 1 on the side away from the upper surface of the dielectric substrate 3. In this way, when electromagnetic waves of different angles are incident, the electromagnetic waves within a specific angle range can pass through through the unclosed slit 2, and the incident electromagnetic waves at other angles are reflected by the metal layer 1, so that angle selectivity can be achieved, multi-frequency point regulation can be realized, and the smaller incident angle range of the wave-transmitting electromagnetic waves can be controlled, resulting in a smaller wave-transmitting angle; the narrow-band angle selection surface structure with adjustable wave-transmitting angles only includes the metal layer 1 and the dielectric substrate 3 arranged in a stacked manner, and the unclosed slit 2 disposed in the metal layer 1, without the need for a more complex structure, so that the thickness of the unit structure is relatively thin. The narrow-band angle selection surface structure with adjustable wave-transmitting angles can adapt to the requirements for the incident angle of the transmitted wave in different environments and meet the needs for precise adjustment of different angles in a dynamic and complex electromagnetic environment.

[0050] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for the purpose of limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified or partial technical features can be equivalently replaced without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way.

[0051] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A narrow-band angle-selective surface structure with adjustable wave transmission angle, characterized in that: include: A plurality of unit structures are periodically arranged, and the plurality of unit structures are connected to each other; the plurality of unit structures each comprises a metal layer, a non-enclosed gap, and a dielectric substrate; The metal layer is arranged on the upper surface of the dielectric substrate, and the non-enclosed gap is arranged in the metal layer on a side away from the upper surface of the dielectric substrate.

2. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 1, characterized in that: The non-closed gap includes a rectangular annular gap and two rectangular gaps connected to each other.

3. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 2, characterized in that: The plurality of unit structures are arranged along the length direction of the two rectangular gaps.

4. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 2, characterized in that: The geometric center of the rectangular annular gap is kept coincident with the geometric center of the metal layer; the two rectangular gaps include a first rectangular gap and a second rectangular gap, and the second rectangular gap is symmetrically arranged with the first rectangular gap; One end of the first rectangular gap is connected to a first midpoint of a side of the rectangular annular gap, and the first rectangular gap extends from the first midpoint to an edge of one end of the metal layer, and the other end of the first rectangular gap is connected to one end of a second rectangular gap in an adjacent first unit structure; One end of the second rectangular gap is connected to the second midpoint, and the second rectangular gap extends from the second midpoint to the other end edge of the metal layer, the other end of the second rectangular gap is connected to one end of the first rectangular gap in the adjacent second unit structure, and the second midpoint is the midpoint of the other side of the rectangular annular gap parallel to the one side.

5. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 1, characterized in that: The thickness of the metal layer is in the range of 0.017 mm to 0.035 mm.

6. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 1, characterized in that: The thickness of the dielectric substrate ranges from 0.5 mm to 0.7 mm.

7. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 4, characterized in that: The ring width of the rectangular annular gap, the width of the first rectangular gap and the width of the second rectangular gap are all the same, the length of the first rectangular gap and the length of the second rectangular gap are the same, and the length of each side of the rectangular annular gap is different from the length of the first rectangular gap and the length of the second rectangular gap.

8. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 7, characterized in that: The ring width of the rectangular annular gap and the width of the two rectangular gaps are both in the range of 0.3mm-0.5mm.

9. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 7, characterized in that: The length of the side of the outer ring of the rectangular annular gap ranges from 6mm to 9mm, the length of the side of the inner ring of the rectangular annular gap ranges from 6mm to 7mm, and the lengths of the two rectangular gaps range from 1mm to 2mm.

10. The narrow-band angle selective surface structure with adjustable wave transmission angle according to claim 8, characterized in that: The material of the metal layer is copper, the material of the dielectric substrate is glass, and the relative dielectric constant of the glass is 5.5, the tangent loss is 0, and the density is 2500 kg / m 3 .

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