WO2021168846A1

WO2021168846A1 - Radome and detection device

Info

Publication number: WO2021168846A1
Application number: PCT/CN2020/077306
Authority: WO
Inventors: 杨小盼; 周宇香; 彭杰
Original assignee: 华为技术有限公司
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2021-09-02
Also published as: CN113692677A; CN113692677B

Abstract

A radome (200, 10) and a detection device (201), the radome being used to cover and protect an antenna array (100). The radome (200, 10) comprises two parts: a cover body (11) and dielectric plates (12), wherein the shape of the cover body (11) can be set according to the arrangement of the antenna array (100) for use in covering all antenna units (101). The dielectric plates (12) are disposed in the radome (200, 10) and are used to weaken the energy coupling between the antenna units (101). The dielectric plates (12) may be located between two adjacent antenna units (101), and reflect signals of the antenna units (101) adjacent thereto so as to isolate the two adjacent antenna units (101). The dielectric plates (12) reflect the signals of the antenna units (101), which may reduce the energy coupling between the antenna units (101), improve the degree of isolation between the antenna units (101), and improve the performance of the antenna units (101). At the same time, the dielectric plates (12) are disposed on the radome (11), which facilitates installation and integration and reduces costs.

Description

Radome and detection device

Technical field

This application relates to the field of communication technology, and in particular to a radome and a detection device.

Background technique

Antenna array is a common form of antenna in communication systems. It is usually used in application scenarios such as base station antennas and radars to achieve greater gain, complete beam scanning, and obtain multi-dimensional information. The coupling between antenna arrays is the main transmission path of electromagnetic interference between antennas. Port isolation is often used to characterize the strength of coupling between antenna arrays. Therefore, port isolation is one of the key indicators in antenna arrays; take S21 as an example. The physical meaning of the description is the energy coupled and transmitted from port 2 to port 1 when other ports are in a matched state. In an actual electrical system, we hope that the smaller the energy, the better, and the greater the isolation, the better.

From the perspective of energy coupling path, the degradation of antenna isolation usually has the following three types:

Positional medium or crosstalk of energy inside the antenna body;

Surface current crosstalk on the surface of the medium or antenna;

Energy coupling in the space above the antenna.

Correspondingly, in order to improve the isolation between the antennas, the isolation can be improved by weakening the coupling between adjacent ports in the array. There is an urgent need for an isolation method that is easy to integrate and install and has a low cost.

Summary of the invention

The present application provides a radome and a detection device, which are used to reduce the energy coupling between antenna elements in an antenna array, and are easy to integrate and install and have low production costs.

In the first aspect, a radome is provided for covering the antenna array to protect the antenna unit. The radome includes two parts: a cover body and at least one dielectric plate fixed in the cover body, wherein the shape of the cover body can be set according to the arrangement of the antenna array, and it only needs to cover all the antenna units. The dielectric plate is arranged in the radome and is used to isolate the energy coupling between the antenna units. When the radome covers the antenna unit, at least one dielectric plate includes a first dielectric plate, and the first dielectric plate is located between the first antenna unit and the second antenna unit Among them, the first antenna unit and the second antenna unit are two adjacent antenna units in the antenna array. The first dielectric plate may reflect the first signal from the first antenna unit and the second signal from the second antenna unit. It can be seen from the above description that the dielectric plate can reflect the signal of the antenna unit, thereby reducing the energy coupling between the antenna units, improving the isolation between the antenna units, and improving the performance of the antenna unit. At the same time, the dielectric board is integrated into the radome, which can effectively reduce the cost and reduce the complexity of setting up the antenna array.

In a specific implementation, the first dielectric plate is used to reduce the energy coupling between the first antenna unit and the second antenna unit. Improve the isolation effect between antenna elements.

In a specific implementation, the dielectric plate is a dielectric plate with high reflectivity and low transmittance. Improve the isolation of the antenna elements and reduce the energy coupling between the antenna elements.

In a specific implementation, the first dielectric plate includes a first reflective surface and a second reflective surface, wherein,

The first reflecting surface is a side surface of the first dielectric plate adjacent to the first antenna unit;

The second reflective surface is a side surface of the first dielectric plate adjacent to the second antenna unit;

Obtaining a first reflection signal and a first refraction signal after the first signal is reflected by the first reflection surface;

The first refraction signal is reflected by the second reflection surface to obtain a second reflection signal;

A second refraction signal is obtained after the second reflection signal is refracted by the first reflection surface;

The first reflection signal and the second refraction signal are in phase. The first reflective surface and the second reflective surface provided can achieve the same phase of the signal after reflection, thereby improving the reflectivity of the dielectric plate, reducing the transmittance of the dielectric plate, and reducing the coupling between the antenna units.

In a specific implementation, the cross-section of the first dielectric plate can have different shapes, such as trapezoid, rectangular, triangular, etc., and only need to have the above-mentioned first reflecting surface and second reflecting surface. The specific shape can be set as required.

In a specific implementation, the cross section of the first dielectric plate is trapezoidal, and the first reflective surface and the second reflective surface are inclined surfaces.

In a specific practical solution, the cross section of the first dielectric plate is an isosceles trapezoid, and the first reflecting surface and the second reflecting surface are symmetrically arranged.

In a specific implementation, the average distance between the first reflective surface and the second reflective surface is a quarter of the wavelength corresponding to the operating frequency band of the antenna unit. So that the reflected signal can be in phase.

In a specific implementation, the first dielectric plate is provided with a frequency selective surface FSS structure. Improve the isolation effect of the antenna unit.

In a specific implementation, the at least one dielectric plate is arranged in a single row, wherein each dielectric plate corresponds to the interval between every two adjacent antenna elements in the antenna array. Realize the isolation of the antenna units arranged in a single row at intervals.

In a specific implementation, the at least one dielectric plate is arranged in a grid-like structure, and each grid of the grid-like structure accommodates each antenna unit in a one-to-one correspondence. Realize the isolation of the antenna elements arranged in the array.

In a specific implementation, each grid is rectangular, trapezoidal or triangular. The media plates can be arranged in different ways.

In a specific implementation, the at least one dielectric plate and the cover body are an integral structure. Convenient media board setting.

In a specific implementation, the at least one dielectric plate is fixedly connected to the cover body by a connecting piece. The fixed connection between the medium plate and the cover body is realized by the connecting piece.

In a specific implementation, the connecting member may be a common connecting member such as bolts, screws, and rivets.

In a specific implementation, the cover body is provided with a first groove corresponding to the dielectric plate, and each dielectric plate is inserted into the corresponding first groove and fixedly connected to the cover body. It is convenient to connect the cover body and the media board.

In a second aspect, a detection device is provided, which includes an antenna array and the radome of any one of the above; wherein the dielectric plate in the radome is used to separate two adjacent antennas in the antenna array unit. The signal of the antenna unit can be reflected by the dielectric plate, so that the energy coupling between the antenna units can be reduced, the isolation between the antenna units can be improved, and the performance of the antenna unit can be improved. At the same time, the dielectric board is integrated into the radome, which can effectively reduce the cost and reduce the complexity of setting up the antenna array.

In a specific implementation, there is a gap between the at least one dielectric plate and the installation surface of the plurality of antenna units.

In a specific implementation, the installation surfaces of the plurality of antenna units are provided with second grooves, and the at least one dielectric plate is inserted into the second grooves one by one. Improve the isolation effect.

In a third aspect, a smart car is provided, and the smart car includes the above-mentioned detection device. In the above solution, it can be seen from the above description that the dielectric plate can reflect the signal of the antenna unit, thereby reducing the energy coupling between the antenna units, improving the isolation between the antenna units, and improving the performance of the antenna unit. At the same time, the dielectric board is integrated into the radome, which can effectively reduce the cost and reduce the complexity of setting up the antenna array.

Description of the drawings

Figure 1 is a schematic diagram of an application scenario of a radome;

FIG. 2 is a schematic structural diagram of a radome provided by an embodiment of the application;

FIG. 3 is a side view of the installation of the radome and antenna unit provided by an embodiment of the application;

FIG. 4 is a working principle diagram of the dielectric plate of the radome provided by an embodiment of the application;

Figure 5 shows the HFSS full-wave simulation result of the antenna array loaded with a traditional radome;

FIG. 6 is the HFSS full-wave simulation result of the antenna array loaded with the radome provided by the embodiment of the application;

Figure 7 is a horizontal plane pattern when the antenna array is loaded with a traditional radome;

Fig. 8 is a horizontal plane pattern when the antenna array is loaded with the radome provided by the embodiment of the present application:

FIG. 9 is a schematic structural diagram of another radome provided by an embodiment of the application;

FIG. 10 is a schematic structural diagram of another radome provided by an embodiment of the application;

FIG. 11 is a schematic structural diagram of another radome provided by an embodiment of the application;

FIG. 12 is a schematic structural diagram of another radome provided by an embodiment of the application;

FIG. 13 is a schematic structural diagram of another radome provided by an embodiment of the application;

FIG. 14 is a schematic structural diagram of another radome provided by an embodiment of the application;

15 is a schematic structural diagram of an antenna array provided by an embodiment of the application;

FIG. 16 is a schematic diagram of another structure of an antenna array provided by an embodiment of the application;

FIG. 17 is a schematic diagram of another structure of an antenna array provided by an embodiment of the application;

18 is a schematic diagram of another structure of an antenna array provided by an embodiment of the application;

Fig. 19 is a schematic structural diagram of a smart car provided by an embodiment of the application.

Detailed ways

To facilitate understanding, firstly, an application scenario of the radome provided by the embodiment of the present application will be explained. As shown in Figure 1, Figure 1 shows a specific implementation of the radome. The radome 200 is used to protect the antenna unit 101 in the antenna array 100, and the signal emitted by the antenna unit 101 can penetrate the radome 200. . However, in the antenna array 100, the separation distance between the antenna elements 101 is relatively small, and there may be coupling between the antenna elements 101, which affects the performance of the antenna array 100. However, the isolation scheme in the prior art adopts different isolation structures on the antenna arrays for different types of antenna arrays, which makes the antenna array setup more complicated, and the isolation structures are only for specific antenna array types, and their adaptability is relatively poor. For this reason, an embodiment of the present application provides a radome. The radome provided by the embodiments of the present application will be described in detail below in conjunction with specific embodiments and drawings.

First of all, the isolation in this application refers to the separation of two antenna units, including but not limited to physical isolation between two antenna units, and signal isolation between two antenna units. The isolation refers to reflecting the signal of the antenna unit, reducing the energy coupling between the antenna units, and improving the isolation of the antenna array.

As shown in Fig. 2, Fig. 2 shows a schematic structural diagram of a radome provided by an embodiment of the present application. The radome 10 shown in FIG. 2 includes a cover 11, which is the housing part of the radome 10, which can be called a shell. The cover 11 is a cover or a housing covering the antenna unit. The cover 11 is used to cover the antenna array to protect the antenna unit. It has good electromagnetic wave penetration characteristics in electrical performance, and can withstand harsh environments in mechanical performance to avoid damage to the antenna unit. The shape of the cover can match the shape of the antenna array. Exemplarily, the shape of the cover 11 may be different shapes such as rectangle, rectangle, sphere, etc. The cover 11 as shown in FIG. 2 adopts a rectangular cover 11. When the radome 10 protects the antenna unit, the signal of the antenna unit can penetrate the radome 10. The principle is that the thickness of the radome 10 is one-half of the wavelength corresponding to the working frequency band of the antenna unit, and the signal of the antenna unit is in the radome 10. The signal is reversed after the first reflection and the second reflection, so the cover 11 has the characteristics of strong transmission and weak reflection, and the signal can penetrate the radome 10.

Continuing to refer to FIG. 2, the cover 11 is provided with a dielectric plate for inserting between adjacent antenna units and isolating the antenna units. Specifically, there is at least one dielectric plate, and the at least one dielectric plate includes a first dielectric plate 12, A dielectric plate 12 is used to reflect the first signal from the first antenna unit and the second signal from the second antenna unit. The first dielectric plate 12 reflects the first signal that may enter the second radiation area (radiation area of the second antenna) back to the first radiation area (radiation area of the first antenna unit); the first dielectric plate 12 may The second signal entering the first radiation area is reflected back into the second radiation area to reduce the energy coupling between the first signal and the second signal, and improve the isolation between the first antenna unit and the second antenna unit. It can be seen in FIG. 2 that the first dielectric plate extends to a certain height along the direction a to separate the first antenna unit and the second antenna unit, where the direction a is the installation plane perpendicular to the antenna array. The first dielectric plate reflects the first signal and the second signal on the side surface along the direction a. Wherein, the side surface of the first dielectric plate along the direction a may be at a certain angle with the direction a, such as 0-30°, for example, it may be 0°, 10°, 15°, 20°, 25°, 30° Wait for different angles.

For the convenience of description, the first dielectric plate 12 is taken as an example. It should be understood that the first dielectric plate 12 is only an example to more clearly introduce the structure and working principle of the radome 10 provided in the present application. Each of the at least one dielectric plate satisfies the characteristics of the first dielectric plate 12.

Optionally, the first dielectric plate 12 and the cover 11 illustrated in FIG. 2 are an integral structure, such as machining (machining, which refers to the process of changing the overall size or performance of the workpiece through a mechanical device, according to The difference in processing methods can be divided into cutting processing and pressure processing) or mold opening (in industrial design refers to the tool set that forms the product design, including mechanical equipment and molds). At this time, the material of the first dielectric plate 12 and the cover body 11 are the same, so that the radome can be formed at one time. Exemplarily, the first dielectric plate 12 and the cover 11 may be made of silicon-containing PC EX9330L, glass fiber reinforced plastic, and other materials with good dielectric properties and strength properties. Continuing to refer to FIG. 2, a plurality of first dielectric plates 12 are arranged in a single row at intervals, each first dielectric plate 12 is a long strip structure, and there is a gap between the first dielectric plates 12, and the gap is used to accommodate the antenna unit.

FIG. 3 shows a side view of the installation of the radome 10 and the antenna array 100 shown in FIG. 2. In Fig. 3, direction A is shown. The antenna elements 101 of the antenna array 100 are arranged at intervals in a single row along the direction A, and the first dielectric plates 12 are also arranged along the direction A. The direction A is any direction, that is, the arrangement direction of the antenna elements 101 is the same as that of the first dielectric plate. The arrangement direction of 12 is the same. Specifically, to facilitate the understanding of the embodiments of the present application, two antenna elements in the antenna array 100 are exemplarily defined: a first antenna element 101a and a second antenna element 101b, and the first antenna element 101a and the second antenna element 101b are Adjacent antenna units, the first dielectric plate 12 is located between the first antenna unit 101a and the second antenna unit 101b. It can be seen from FIG. 3 that the first dielectric plate 12 and the antenna unit 101 are alternately arranged, and any two adjacent antenna units 101 are separated by the first dielectric plate 12. In a possible implementation manner, the number of the first dielectric plates 12 may be determined according to the antenna elements in the antenna array, for example, there is a first dielectric plate between any two adjacent antenna elements, such as the antenna element. If the number is n, the number of the first dielectric plates is at least n-1, where n is a positive integer greater than 2. Exemplarily, when there are two antenna units, one first dielectric plate 12 may be used; when there are three antenna units, two first dielectric plates 12 may be used.

In a possible implementation manner, the first dielectric plate 12 is arranged perpendicular to the installation surface of the antenna array. Of course, the installation surface of the first dielectric plate 12 perpendicular to the antenna array illustrated in FIG. 3 is only a reference. The included angle between the board 12 and the installation surface of the antenna array, such as an included angle of -10° to 10°, can also be applied in the embodiments of the present application.

As shown in Figure 4, Figure 4 shows a schematic diagram of the first dielectric plate 12 reflecting the first antenna element 101a, and Figure 4 shows the adjacent first antenna element 101a and the second antenna element 101b. The board 12 is located between the first antenna unit 101a and the second antenna unit 101b. The first dielectric plate 12 provided by the embodiment of the present application has a first reflective surface 12a and a second reflective surface 12b. The first reflective surface 12a and the second reflective surface 12b are two opposite surfaces, wherein the first reflective surface 12a is The side surface of the first dielectric plate 12 adjacent to the first antenna unit 101a, and the second reflective surface 12b is the side surface adjacent to the first dielectric plate 12 and the second antenna unit 101b.

Optionally, the cross section of the first dielectric plate 12 (refer to the surface after the first dielectric plate 12 is cut along the line AA shown in FIG. 2) is an isosceles trapezoid, and the first reflective surface 12a and The second reflective surface 12 b is two opposite inclined surfaces of the first dielectric plate 12, and the first reflective surface 12 a and the second reflective surface 12 b are symmetrically arranged with respect to the central axis of the first dielectric plate 12. The wider end of the first dielectric plate 12 is D, and the narrower end is d. The average distance between the first reflective surface 12a and the second reflective surface 12b is a quarter of the wavelength λ corresponding to the working frequency band of the antenna unit 101. That is, the average distance between the first reflective surface 12a and the second reflective surface 12b: (d+D)/2=1/4 of λ.

Further, the first dielectric plate 12 is used to reflect the first signal from the first antenna unit 101a, and the specific reflection principle is shown in the solid line arrow and the dashed line arrow in FIG. 4. The first signal emitted by the first antenna unit 101a obtains a first reflected signal (solid arrow) and a first refraction signal (dashed arrow) when propagating to the first reflecting surface 12a, and the first reflected signal is the first reflecting surface The signal after 12a is reflected, and the first refraction signal is a signal that penetrates into the first dielectric plate 12. The first refraction signal passes through the first reflective surface 12a and enters into the first dielectric plate 12 to propagate. The first refraction signal is reflected on the second reflective surface 12b to obtain a second reflected signal, and the second reflected signal is refracted by the first reflective surface 12a. After obtaining the second refraction signal, the second refraction signal enters the air and propagates. In a possible implementation, taking the phase of the first signal incident on the first reflecting surface 12a as 0° as an example, the phase of the first reflected signal obtained after being reflected by the first reflecting surface 12a is 180°, The thickness of a dielectric plate 12 is a quarter of the wavelength λ of the antenna unit 101 corresponding to the working frequency band. Therefore, the phase of the first refracted signal incident on the second reflecting surface 12b is 90°, and accordingly, the second reflected signal travels through Therefore, the phase of the second refraction signal after the second reflection signal is refracted on the first reflection surface 12a is 180°. Therefore, the first signal of the first antenna unit 101a is reflected and refracted by the first reflecting surface 12a and the second reflecting surface 12b, and the first reflected signal is in phase with the second refracted signal. The in-phase refers to the same phase of the signal. It can be seen from the above description that the double reflection of the first reflective surface 12a and the second reflective surface 12b reduces the energy of the first signal penetrating the first dielectric plate 12, and achieves the effects of high reflection and low transmission.

The first dielectric plate 12 can also reflect the second signal from the second antenna unit 101b, and the principle of reflection is the same as the principle of reflecting the first signal, which will not be repeated here.

In order to facilitate the understanding of the difference between the radome provided by the embodiment of the present application and the radome in the prior art, the following shows the simulation results of the two radomes respectively.

Figure 5 shows the HFSS full-wave simulation result of the antenna array loaded with a traditional radome. Refer to Figure 1 for the structure of the traditional radome. It can be seen from Figure 5 that the isolation between adjacent antenna unit ports is 14.7dB.

FIG. 6 shows the HFSS full-wave simulation result of the antenna array loaded with the radome provided by the embodiment of the present application. It can be seen from FIG. 6 that the isolation between adjacent antenna unit ports is 18.5 dB.

Comparing FIG. 5 and FIG. 6, it can be seen that the isolation between the antenna elements after loading the radome provided by the embodiment of the present application is improved by 3.8 dB compared with the isolation between the antenna elements loaded with the traditional radome.

It can be seen from the above description that after the first signal and the second signal are reflected by the first dielectric plate 12, the high reflectivity and low transmittance performance of the first dielectric plate 12 reduces the first signal and the second signal. The energy coupling. The first antenna unit 101a and the second antenna unit 101b can be separated by the first dielectric plate 12, which reduces the energy coupling between the antenna units 101, improves the isolation between the antenna units 101, and also improves the antenna array Performance. In addition, the first dielectric plate 12 is arranged on the radome 10, and the first dielectric plate 12 can be integrally formed with the cover body 11. The structure is simple and easy to manufacture. Compared with the separation method of the antenna unit 101 in the prior art, the separation method of the antenna unit 101 is reduced. It is difficult to manufacture and also reduces production costs. In addition, when the radome provided in the embodiment of the present application is used, there is no need to provide a structure of antenna units for isolation on the antenna array, which simplifies the complexity of the antenna array. In addition, for different types of antenna element arrays, for example, when the antenna elements of the antenna array adopt metal waveguide antennas or printed circuit board antennas, the isolation methods provided in the embodiments of the present application can be applied, which improves the applicability of the radome.

Continuing to refer to FIG. 4, in an achievable manner, the wider end of the first dielectric plate 12 is connected to the cover 11, and the narrower end faces the antenna unit 101. Therefore, the horizontal beam width of the antenna is improved by the reflection effect of the first dielectric plate 12. The relative inclination angle of the first reflecting surface 12a and the second reflecting surface 12b is not specifically limited in the embodiment of the present application, and the relative inclination angle of the first reflecting surface 12a and the second reflecting surface 12b can be adjusted according to actual needs. .

The antenna array loaded with the radome shown in FIG. 4 and the antenna array loaded with the radome in the prior art in FIG. 1 are simulated.

Figure 7 shows the horizontal plane pattern when the antenna array is loaded with a conventional radome. It can be seen from Figure 7 that the horizontal beam width of the antenna array is 109°.

FIG. 8 shows a horizontal plane pattern when the antenna array is loaded with the radome provided by the embodiment of the present application. It can be seen from FIG. 8 that when the antenna array is loaded with the radome provided in the embodiment of the present application, the horizontal beam width is 133°.

Comparing FIG. 7 and FIG. 8, it can be seen that, compared with the traditional radome, the radome provided by the embodiment of the present invention can broaden the horizontal beam by 24° to achieve the effect of special beamforming.

It can be seen from the comparison of the above horizontal pattern that when the first dielectric plate 12 adopts a structure with a wide top and a narrow bottom, the angle of the reflected signal can be changed by the reflection of the first dielectric plate 12, and the first dielectric plate 12 can behave similarly. The function of the wide-angle lens can broaden the beam width in the horizontal direction, so as to achieve the effect of special beam shaping. On the other hand, when the trapezoidal structure is adopted, the first reflecting surface and the second reflecting surface can form a drafting slope, which is easy for mold opening processing.

It should be understood that the cross-sectional shape of the first dielectric plate 12 shown in FIG. 4 is only a specific example, and the first dielectric plate 12 used in the embodiment of the present application may also adopt other shapes. Exemplarily, the cross section of the first dielectric plate 12 may be a non-isosceles trapezoid shape; or, the wider end of the first dielectric plate 12 may face the antenna unit, and the narrower end may be connected to the cover 11; or, as As shown in FIG. 9, the cross section of the first dielectric plate 12 is rectangular; or as shown in FIG. 10, the cross section of the first dielectric plate 12 is an inverted triangle. In addition, the first reflecting surface and the second reflecting surface illustrated in FIGS. 4, 10, and 11 are both flat surfaces, but in the embodiment of the present application, the two reflecting surfaces are not limited to be flat surfaces, and curved surfaces may also be used. , Such as concave curved surface or convex curved surface, can be applied to the above-mentioned Figure 4, Figure 10, Figure 11, wherein, the average between the first reflective surface 12a and the second reflective surface 12b The spacing is 1/4λ. In the actual integration process, the average distance can also be approximately equal to 1/4λ, for example, the average spacing is between 1/6λ and 1/3λ.

To facilitate understanding, let me first explain that Frequency Selective Surface (FSS) is a two-dimensional periodic array structure, essentially a spatial filter, which exhibits obvious band-pass or band-stop filtering when interacting with electromagnetic waves. characteristic. The frequency selective surface can transmit or reflect waves of different frequencies, thereby having a specific frequency selective effect.

As shown in FIG. 11, FIG. 11 shows a schematic structural diagram of another radome 10 provided by an embodiment of the present application. In the schematic structural diagram shown in FIG. 11, the first dielectric plate 12 is provided with an FSS structure 12c (Frequency Selective Surface). The FSS structure 12c can choose to penetrate waves of a certain frequency band, and waves of other frequency bands are not. Through the use of the above-mentioned characteristics of the frequency selection surface, the FSS structure 12c whose wavelength is opaque in the working frequency band of the antenna unit can be selected to improve the isolation effect of the first dielectric plate. The FSS structure 12c shown in FIG. 11 only represents the installation position of the FSS structure 12a, and does not represent the actual shape of the FSS structure 11c. The specific shape of the FSS structure 12c and the selected frequency can be set according to the working frequency band of the antenna unit, which is not specifically limited here.

When the FSS structure 12c is specifically installed, it may be installed only on the first reflection surface 12a, may also be installed only on the second reflection surface 12b, or installed on the first reflection surface 12a and the second reflection surface 12b at the same time. Wherein, the FSS structure provided on the second reflective surface 12b can refer to the FSS structure shown in FIG. 11, which will not be described in detail here.

As shown in FIG. 12, FIG. 12 shows a schematic structural diagram of another radome 10. The part numbers in FIG. 12 can refer to the same reference numbers in FIG. 3. The difference between the radome 10 shown in FIG. 12 and the radome 10 shown in FIG. 2 is that the first dielectric plate 12 and the cover 11 adopt a separate structure. As shown in Figure 12, the cover 11 is provided with first grooves corresponding to the first dielectric plate 12 one-to-one (because the first grooves overlap the first dielectric plate 12, it is not marked, the first groove The shape can refer to the shape of the part where the first medium plate 12 is inserted into the cover 11), the first medium plate 12 is inserted into the corresponding first groove and fixedly connected with the cover 11. Exemplarily, the first dielectric plate 12 may be fixedly connected with the first groove by interference fit; or the first dielectric plate 12 may be inserted into the first groove and fixedly connected with the cover 11 by adhesive glue; or The first groove adopts a dovetail groove; the first medium plate 12 is provided with matching dovetail protrusions, which are fixed by the engagement of the dovetail protrusion and the dovetail groove; or the cover body 11 is not provided with the first groove, A dielectric plate 12 is directly fixedly connected to the cover 11 by adhesive glue.

When the first dielectric plate 12 and the cover body 11 adopt a separate structure, in addition to the above-mentioned structure shown in FIG. 12, a manner in which the first dielectric plate 12 is connected to the cover body 11 through a connector can also be used. Exemplarily, the first medium plate 12 is fixedly connected to the cover body 11 through common connectors such as threaded connectors (bolts or screws) and rivets.

As shown in Figure 13, Figure 13 shows a schematic structural diagram of another radome. In Figure 13, the first dielectric plate 13 indicated by the lines only represents the arrangement of the first dielectric plate 13, and does not represent the first The actual shape of the dielectric plate 13; the circular shape is only an example of the setting position of the antenna unit 101, and does not represent the actual shape of the antenna unit 101. The part numbers in FIG. 13 may refer to the same reference numbers in FIG. 2. The difference between the radome 10 shown in FIG. 13 and the radome 10 shown in FIG. 2 lies in the arrangement of the first dielectric plate 12. The first dielectric plates 12 in FIG. 2 are arranged in a single row and spaced apart, and the antenna units 101 in the applicable antenna array are arranged in a single row and spaced apart. In the radome 10 shown in FIG. 13, at least one dielectric plate is arranged in a grid-like structure, and each grid 12d of the grid-like structure accommodates each antenna unit 101 in a one-to-one correspondence. In FIG. 13, a plurality of first dielectric plates 12 are arranged crosswise and surround a grid 12 d for accommodating each antenna unit 101. As shown in FIG. 13, a plurality of first dielectric plates 12 are arranged in a staggered horizontally and longitudinally to form a rectangular grid, and the grids are arranged in an array arrangement. Therefore, the radome 10 shown in FIG. 13 can be applied to an antenna array in which the antenna units 101 are arranged in an array manner. In addition, an integral structure or a separate structure may be adopted between the first dielectric plate 12 and the cover 11 shown in FIG.

It should be understood that the arrangement of the first dielectric plates 12 shown in FIG. 13 is only an example. When applicable to an antenna array with an array of antenna elements, the first dielectric plates 12 can be cross-arranged in different ways. A space that can correspond to each antenna unit one-to-one is required. Illustratively, as shown in FIG. 14, the first dielectric plates 12 are arranged at an angle of 60° to form a triangular space, and the antenna unit 101 is arranged in In a triangular space, where, in FIG. 14, the first dielectric plate 14 indicated by the line only represents the arrangement of the first dielectric plate 14 and does not represent the actual shape of the first dielectric plate 14; the circle is only an example of the antenna unit The setting position of the antenna unit 101 does not represent the actual shape of the antenna unit 101. Alternatively, a trapezoidal or prismatic space may also be provided to cross between the first dielectric plates 12.

The embodiment of the present application provides a detection device, such as a millimeter wave radar, a laser detector, or other known detection devices, and the detection device includes an antenna array. The embodiment of the present application does not limit the form of the antenna array. The antenna unit of the antenna array may be a metal waveguide antenna or an antenna in the form of a printed circuit board. The multiple antenna elements in the antenna array can be arranged in a single row or in an array, and the specific arrangement can be arranged according to actual application scenarios. The detection device further includes a radome for isolating the antenna units, and the radome can adopt any of the above-mentioned radomes. When the above-mentioned radome is used, the cover body of the radome only needs to cover a plurality of antenna units, and the dielectric plate only needs to be able to isolate adjacent antenna units.

When the first dielectric plate isolates the antenna unit, the method shown in FIG. 15 can be used. The first dielectric plate 12 is located above the antenna unit 101, and the minimum distance between the first dielectric plate 12 and the antenna unit 101 is H. It is also possible to use the method shown in FIG. 16, in which the first dielectric plate is in contact with the upper surface of the antenna unit 101 (taking the placement direction of the antenna shown in FIG. 16 as the reference direction); the arrangement of the first dielectric plate 12 and the antenna unit 101 There is a gap of H2 height between the surfaces. Alternatively, as shown in FIG. 17, the first dielectric plate 12 is inserted between the multiple antenna units 101, and the installation surface of the single-distance antenna unit 101 still has a certain distance h (h is less than H); it can also be used As shown in FIG. 18, the installation surface of the plurality of antenna units 101 is provided with a second groove, and the first dielectric plate 12 is inserted into the second groove (because the second groove overlaps with the first dielectric plate 12, there is no (Marked, the shape of the second groove may refer to the shape of the portion of the first medium plate 12 inserted into the setting surface). Therefore, each antenna unit 101 is arranged in an independent space through the first dielectric plate 12, the cover 11, and the installation surface, which improves the isolation effect between the antenna units 101.

It can be seen from the above description that in the detection device provided by the embodiment of the present application, the signal of the antenna unit can be reflected through the first dielectric plate, so that the energy coupling between the antenna units can be reduced, and the isolation effect between the antenna units can be improved. Improve the performance of the antenna unit. At the same time, the first dielectric plate is arranged on the cover body and can be integrated on the radome, which can effectively reduce the cost.

The embodiment of the present application also provides a smart car. As shown in FIG. 19, the smart car 200 is provided with at least one detection device 201, for example, two, three, four, etc. different numbers of detection devices 201 are provided. The location of the detection device 201 is not specifically limited in this application. For example, it can be installed at the rear of the vehicle, or at the front of the vehicle, on the roof, or on the side of the vehicle body. The detection device 201 can reflect the signal of the antenna unit by using the first dielectric plate, thereby reducing the energy coupling between the antenna units, improving the isolation effect between the antenna units, improving the performance of the antenna unit, and improving the detection of the smart car 200 Function. At the same time, the first dielectric plate is arranged on the cover body and can be integrated on the radome, which can effectively reduce the cost.

Obviously, those skilled in the art can make various changes and modifications to this application without departing from the protection scope of this application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, then this application is also intended to include these modifications and variations.

Claims

A radome for protecting an antenna array, characterized in that the radome includes a cover and at least one dielectric plate fixed in the cover; wherein, the at least one dielectric plate includes a first dielectric plate, The first dielectric plate is located between a first antenna element and a second antenna element, the first antenna element and the second antenna element are adjacent antenna elements in the antenna array, and the first dielectric plate The first signal from the first antenna unit and the second signal from the second antenna unit are reflected.
The radome according to claim 1, wherein the first dielectric plate is used to reduce the energy coupling between the first antenna unit and the second antenna unit.
The radome according to claim 1, wherein the first dielectric plate comprises a first reflective surface and a second reflective surface, wherein,

The first reflecting surface is a side surface of the first dielectric plate adjacent to the first antenna unit;

The second reflective surface is a side surface of the first dielectric plate adjacent to the second antenna unit;

Obtaining a first reflection signal and a first refraction signal after the first signal is reflected by the first reflection surface;

The first refraction signal is reflected by the second reflection surface to obtain a second reflection signal;

A second refraction signal is obtained after the second reflection signal is refracted by the first reflection surface;

The first reflection signal and the second refraction signal are in phase.
The radome according to any one of claims 1 to 3, wherein the cross section of the first dielectric plate is trapezoidal, and the first reflective surface and the second reflective surface are inclined surfaces.
The radome according to claims 1 to 4, wherein the average distance between the first reflective surface and the second reflective surface is one-fourth of the operating wavelength of the antenna unit.
The radome according to any one of claims 1 to 5, wherein the first dielectric plate is provided with a frequency selective surface FSS structure.
The radome according to any one of claims 1 to 6, wherein the at least one dielectric plate is arranged in a single row, wherein each dielectric plate corresponds to every two adjacent antenna elements in the antenna array Interval.
The radome according to any one of claims 1 to 7, wherein the at least one dielectric plate is arranged in a grid-like structure, and each grid of the grid-like structure accommodates each Antenna unit.
The radome according to claim 8, wherein each grid is rectangular, trapezoidal or triangular.
The radome according to any one of claims 1-9, wherein the at least one dielectric plate and the cover body are an integral structure.
The radome according to any one of claims 1-9, wherein the at least one dielectric plate and the cover body are connected by a connector.
The radome according to claim 11, wherein a first groove corresponding to each of the dielectric plates is provided in the housing body, and each dielectric plate is inserted into the corresponding first groove and connected with each other. The cover is connected.
The radome according to any one of claims 1 to 12, wherein the first dielectric plate is perpendicular to the installation surface of the antenna array.
A detection device, characterized by comprising an antenna array and the radome according to any one of claims 1-13; wherein the dielectric plate in the radome is used to separate two adjacent ones in the antenna array Antenna unit.
The detection device according to claim 14, wherein there is a gap between the at least one dielectric plate and the installation surface of the antenna array.
The detection device according to claim 14, wherein the installation surfaces of the plurality of antenna units are provided with second grooves, and the at least one dielectric plate is inserted into the second grooves one by one.