Millimeter wave radar and electronic device

Abstract

The invention provides a millimeter wave radar and an electronic device. The millimeter wave radar comprises a substrate; the antenna module is arranged on the substrate; the reflecting layer and the substrate are arranged at an interval, a first hollow area is arranged on the reflecting layer, and the first hollow area is arranged corresponding to the antenna module so as to expose the antenna module; and the first supporting piece is arranged between the substrate and the reflecting layer. The millimeter wave radar can overcome the phase deviation problem.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a millimeter wave radar and an electronic device. BACKGROUND

[0002] In household appliances, the application of millimeter wave radars is relatively common, and it has become one of the key components for many household appliances to realize intelligent functions. The millimeter wave radar often adopts a three-dimensional integrated structure of an AOP (Antenna On Package) antenna. This type of antenna is usually directly formed on the surface of a chip, and the chip body is composed of a multi-layer circuit stacking structure and a packaging structure. This stacking packaging architecture inevitably leads to a specific packaging height of the chip as a whole, and further causes an unignorable physical distance between the AOP antenna and the circuit ground as a reference plane.

[0003] In particular, it is worth noting that when the working frequency band of the AOP antenna is raised to the millimeter wave or even the terahertz frequency band, the electromagnetic wave wavelength is significantly shortened, and the sensitivity of the spatial relationship between the antenna and the reflecting surface increases.

[0004] Under this technical background, the conventional design idea of directly using the circuit ground metal surface as the electromagnetic wave reflecting surface in the prior art cannot effectively overcome the phase deviation problem caused by the aforementioned physical distance, and cannot meet the technical requirements of optimizing the antenna radiation characteristics in high-frequency application scenarios. SUMMARY

[0005] Embodiments of the present application provide a millimeter wave radar and an electronic device, which can overcome the phase deviation problem.

[0006] Embodiments of the present application provide a millimeter wave radar, comprising: a substrate; an antenna module, disposed on the substrate; a reflecting layer, disposed apart from the substrate, the reflecting layer being provided with a first hollow area corresponding to the antenna module to expose the antenna module; a first support member, disposed between the substrate and the reflecting layer.

[0007] In some embodiments, the distance between the substrate and the reflecting layer is greater than or equal to the thickness of the antenna module.

[0008] In some embodiments, the first support member comprises a first support layer provided with a second hollow area, the first hollow area and the second hollow area being in communication, and the antenna module is disposed in the second hollow area.

[0009] In some embodiments, a minimum distance between a projected outer contour of the reflecting layer on the substrate and a projected outer contour of the antenna module on the substrate satisfies formula (1): (1) wherein the D is the minimum distance between the projected outer contour of the reflecting layer on the substrate and the projected outer contour of the antenna module on the substrate, and the is a vacuum wavelength of the millimeter wave radar operating frequency band.

[0010] In some embodiments, the millimeter wave radar further comprises a second support and a wave-transparent layer, the wave-transparent layer is arranged on a side of the second support away from the reflecting layer, the wave-transparent layer is arranged spaced apart from the reflecting layer, the second support is arranged between the wave-transparent layer and the reflecting layer, and the second support is connected with the wave-transparent layer and the reflecting layer respectively.

[0011] In some embodiments, the second support comprises a second support layer, the second support layer is provided with a third hollowed-out area, the third hollowed-out area is in communication with the first hollowed-out area, and the third hollowed-out area corresponds to the antenna module to expose the antenna module.

[0012] In some embodiments, the second support layer further has a porous area, and the porous area is arranged on a circumferential side of the third hollowed-out area.

[0013] In some embodiments, the wave-transparent layer is integrally formed with the second support.

[0014] In some embodiments, a distance between the wave-transparent layer and the reflecting layer is one-tenth of a wavelength.

[0015] In some embodiments, the millimeter wave radar further comprises an ink layer, and the ink layer is arranged on a surface of the wave-transparent layer.

[0016] In some embodiments, the millimeter wave radar further comprises a control chip, and the control chip is arranged on the substrate and is arranged spaced apart from the antenna module.

[0017] Embodiments of the present application also provide an electronic device comprising the above millimeter wave radar.

[0018] In some embodiments, the electronic device further comprises a housing, and the millimeter wave radar further comprises a second support and a wave-transparent layer, the wave-transparent layer is arranged on a side of the second support away from the reflecting layer, the wave-transparent layer is arranged spaced apart from the reflecting layer, the second support is arranged between the wave-transparent layer and the reflecting layer, and the second support is connected with the wave-transparent layer and the reflecting layer respectively; at least part of the housing is the wave-transparent layer.

[0019] The millimeter wave radar and the electronic device provided by the embodiments of the present application, the millimeter wave radar comprises a substrate, an antenna module, a first support and a reflection layer, the height of the reflection layer relative to the substrate is raised through the first support, the reflection layer can effectively reflect the electromagnetic wave radiated by the antenna module, thereby overcoming the problem of phase deviation caused by the physical distance between the antenna module and the circuit ground in the prior art, and the overall performance of the millimeter wave radar is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 The first structure schematic diagram of the millimeter wave radar provided by the embodiments of the present application.

[0022] Figure 2 The second structure schematic diagram of the millimeter wave radar provided by the embodiments of the present application.

[0023] Figure 3 The third structure schematic diagram of the millimeter wave radar provided by the embodiments of the present application.

[0024] Figure 4 The fourth structure schematic diagram of the millimeter wave radar provided by the embodiments of the present application.

[0025] Figure 5 The Figure 4 explosion schematic diagram.

[0026] Figure 6 The fifth structure schematic diagram of the millimeter wave radar provided by the embodiments of the present application.

[0027] Figure 7 The antenna directional diagram provided by the embodiments of the present application: (1) the antenna directional diagram of the bare AOP antenna; (2) the antenna directional diagram of the AOP antenna installed on the substrate; (3) the antenna directional diagram of the millimeter wave radar provided by the embodiments of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] The embodiment of the present application provides a kind of millimeter wave radar and electronic equipment, which can overcome phase deviation problem.The specific description is made below in conjunction with drawings.

[0030] Please refer to Figure 1 And Figure 2 , Figure 1 the first structure schematic diagram of millimeter wave radar provided by the embodiment of the present application, Figure 2 the second structure schematic diagram of millimeter wave radar provided by the embodiment of the present application.

[0031] The embodiment of the present application provides a kind of millimeter wave radar 100, including substrate 10, antenna module 20, reflecting layer 30 and first support 40.

[0032] The substrate 10 is as the basic structure plate in millimeter wave radar 100, provides physical support and electrical connection for antenna module 20 etc..Substrate 10 can be made of material with good electrical performance and mechanical performance, such as Printed Circuit Board (PCB) etc..

[0033] Antenna module 20 is arranged on substrate 10.Antenna module 20 is responsible for converting electrical signal into millimeter wave frequency band electromagnetic wave and radiating, and receiving millimeter wave electromagnetic wave reflected by target and converting it into electrical signal, realizes the emission and reception function of signal, and its performance directly influences the detection precision, distance and other indexes of millimeter wave radar 100.

[0034] The antenna module 20 adopts three-dimensional integrated structure, includes AOP antenna and chip body.AOP antenna is usually formed directly on the surface of chip body, and this integrated mode helps to reduce the overall size of antenna and improve integration.The chip body is composed of multilayer circuit laminated structure and packaging structure, and this laminated packaging architecture endows chip body with specific physical size and characteristics, and also makes that antenna module 20 has specific packaging height overall.Due to this packaging height, the physical spacing between AOP antenna and the ground layer of substrate 10 as reference plane cannot be ignored.The physical spacing will affect the propagation characteristics of electromagnetic wave to some extent, and may cause the emergence of phase deviation problem.

[0035] The reflective layer 30 is spaced apart from the substrate 10 to increase the height of the reflective layer 30 relative to the substrate 10, for example, so that the reflective surface of the reflective layer 30 is approximately flush with the side of the antenna module 20 away from the substrate, or the reflective surface of the reflective layer 30 is slightly higher than the side of the antenna module 20 away from the substrate. Through this spacing arrangement, the reflective layer 30 can correct the phase deviation between the AOP antenna and the ground layer of the substrate 10 caused by the packaging height of the antenna module 20, ensuring that the reflective layer 30 can effectively reflect the electromagnetic waves radiated by the antenna module 20. In this way, the problem of phase deviation caused by the physical distance between the antenna module 20 and the circuit ground in the prior art is overcome, thereby improving the overall performance of the millimeter wave radar 100.

[0036] The reflective layer 30 is provided with a first hollow area 31, which is arranged corresponding to the antenna module 20 to expose the antenna module 20, ensuring that the electromagnetic waves radiated by the millimeter wave antenna chip can smoothly propagate through the reflective layer 30, while the reflective layer 30 can still effectively reflect electromagnetic waves in other directions.

[0037] The reflective layer 30 is made of a material that can efficiently reflect electromagnetic waves in the millimeter wave frequency band, for example, metal.

[0038] Please continue to refer to Figure 2 The first support 40 is arranged between the substrate 10 and the reflective layer 30, and can be connected to the substrate 10 and the reflective layer 30 respectively to support the substrate 10 and the reflective layer 30, ensuring that the reflective layer 30 can be stably positioned at an appropriate height. Through the reasonable arrangement of the first support 40, the distance between the reflective layer 30 and the substrate 10 can be accurately controlled, so that the reflective layer 30 can accurately reflect the electromagnetic waves radiated by the millimeter wave antenna chip, thereby effectively overcoming the problem of phase deviation caused by the physical distance between the millimeter wave antenna and the circuit ground in the prior art.

[0039] The distance between the substrate 10 and the reflective layer 30 is greater than or equal to the thickness of the antenna module 20, so that the reflective surface of the reflective layer 30 is approximately flush with the side of the antenna module 20 away from the substrate, or the reflective surface of the reflective layer 30 is slightly higher than the side of the antenna module 20 away from the substrate, thereby ensuring that the reflective layer 30 can continuously and stably reflect electromagnetic waves.

[0040] If the distance between the substrate 10 and the reflective layer 30 is too small, less than the thickness of the antenna module 20, it may cause electromagnetic field interference between the reflective layer 30 and the antenna module 20, affecting the normal radiation and reflection of electromagnetic waves, and thereby reducing the detection performance of the radar. When the distance is greater than or equal to the thickness of the antenna module 20, such interference can be reduced, allowing the reflective layer 30 to more effectively reflect the electromagnetic waves radiated by the antenna module 20, improve the utilization efficiency of electromagnetic waves, and enhance the overall performance of the millimeter wave radar 100.

[0041] In some cases, the first support 40 comprises a first support frame connected with the substrate 10 and the reflecting layer 30 respectively, and the first support frame forms a channel. The first support frame is arranged between the substrate 10 and the reflecting layer 30, the substrate 10 and the reflecting layer 30 are arranged on both sides of the channel, the antenna module 20 is arranged in the channel, and the channel is filled with air medium. The air medium has relatively stable electromagnetic properties, and under normal design and use conditions, the air medium will not have a significant absorption or reflection effect on the electromagnetic waves radiated by the antenna module 20, and can ensure that the electromagnetic waves propagate in the cavity according to the expected path and manner.

[0042] In other cases, please continue to refer to Figure 2 , the first support 40 comprises a first support layer, which is a layered structure with a certain thickness and undertakes the main support function in the first support 40, and can maintain the appropriate distance and relative position relationship between the substrate 10 and the reflecting layer 30 by virtue of its good strength and stability. The first support layer has a second hollow area 411 along its thickness direction. The first hollow area 31 and the second hollow area 411 are in communication, and the antenna module 20 is arranged in the second hollow area 411, which not only ensures that the antenna module 20 can be stably installed in the appropriate position, but also avoids the first support layer blocking the millimeter wave frequency band electromagnetic waves radiated and received by the antenna module 20, so that the electromagnetic waves can propagate without obstruction, thereby ensuring that the millimeter wave radar 100 can normally play a detection function.

[0043] The material of the first support layer can be PC (Polycarbonate, polycarbonate).

[0044] When the first support 40 adopts the first support layer in this form, there are various feasible schemes for the forming method of the first support layer and the reflecting layer 30. One of the ways is to perform a metal electroplating process on the first support layer. Metal electroplating is a mature surface treatment process, which can uniformly deposit a layer of metal film on the surface of the first support layer through electrochemical method. This layer of metal film has good electrical conductivity and high reflectivity to millimeter waves, and can be used as a key part of the reflecting layer 30, together with the first support layer to form a structure that meets the design requirements, realizing effective reflection of millimeter waves and stable support of the structure.

[0045] Another possible way is to use a single-sided copper circuit board to directly form the first support layer and the reflecting layer 30 through a hole digging process. The single-sided copper circuit board is a common and easily accessible circuit board type, which is paved with a layer of copper foil on one side. During the manufacturing process, through mechanical processing methods such as drilling, milling, etc., or chemical etching methods, using a specific chemical solution to corrode the copper foil and the circuit board substrate, holes of specific shape and size are dug on the circuit board. These holes can form the hollow structure of the first support layer, and the remaining copper foil part can be used as the reflecting layer 30, thereby directly obtaining the first support layer and the reflecting layer 30 with the required structure. This manufacturing method has the advantages of relatively simple process, lower cost, higher production efficiency, etc., and is suitable for large-scale production of millimeter wave radars 100.

[0046] Please refer to Figure 3 , Figure 3 The third structure diagram of the millimeter wave radar provided by the embodiment of the present application.

[0047] The distance between the outer contour of the projection of the reflecting layer 30 on the substrate 10 and the outer contour of the projection of the antenna module 20 on the substrate 10 is greater than or equal to the length of a millimeter wave radar 100 operating frequency band vacuum wavelength, that is, the minimum distance between the projection outer contour of the reflecting layer 30 on the substrate 10 and the projection outer contour of the antenna module 20 on the substrate 10 satisfies formula (1): (1) Wherein, D is the distance between the outer contour of the projection of the reflecting layer 30 on the substrate 10 and the outer contour of the projection of the antenna module 20 on the substrate 10, is the vacuum wavelength of the millimeter wave radar 100 operating frequency band.

[0048] When D is greater than or equal to the length of a wavelength, effective reflection of electromagnetic waves can be formed. In this case, after the electromagnetic wave is irradiated onto the reflecting layer 30, it will be reflected back at a specific angle according to the law of reflection, thereby realizing effective regulation of the electromagnetic wave propagation path, optimizing the electromagnetic radiation characteristics of the device, and improving the detection accuracy and distance of the device to the target. For example, when the millimeter wave radar 100 operating frequency band is 60GHz, is 5mm, and D is greater than or equal to 5mm; when the millimeter wave radar 100 operating frequency band is 77GHz, is 3.9mm, and D is greater than or equal to 3.9mm.

[0049] When D is less than the length of a wavelength, the propagation characteristics of electromagnetic waves change significantly. Because electromagnetic waves are wave-like, when they encounter obstacles (i.e., the edges of the reflective layer 30) with dimensions similar to or smaller than the wavelength, the electromagnetic waves will bypass the edges of the reflective layer 30 and continue to propagate. This phenomenon is similar to the diffraction of light, which leads to adverse effects such as reduced reflected energy, increased beam sidelobes, and asymmetrical radiation patterns.

[0050] Please see Figure 4 as well as Figure 5 , Figure 4 This is a schematic diagram of the fourth structure of the millimeter-wave radar provided in the embodiments of this application. Figure 5 for Figure 4 An explosion diagram is shown. In some embodiments, the millimeter-wave radar 100 further includes a second support member 50 and a wave-transparent layer 60. The wave-transparent layer 60 is disposed on the side of the second support member 50 away from the reflective layer 30. The wave-transparent layer 60 and the reflective layer 30 are spaced apart. The second support member 50 is disposed between the wave-transparent layer 60 and the reflective layer 30. The second support member 50 is connected to the wave-transparent layer 60 and the reflective layer 30 respectively.

[0051] The distance between the wave-transmitting layer 60 and the reflective layer 30 is one-tenth of the vacuum wavelength of the millimeter-wave radar 100's operating frequency band. This effectively reduces the reflection and interference of electromagnetic waves during propagation, allowing millimeter waves to propagate more smoothly inside the radar, thereby improving the efficiency of radar signal reception and transmission, and ultimately enhancing the overall performance and detection accuracy of the millimeter-wave radar 100.

[0052] In some cases, the second support member 50 includes a second support frame, which is connected to both the wave-transparent layer 60 and the reflective layer 30, forming a channel. The second support frame is disposed between the wave-transparent layer 60 and the reflective layer 30, which are located on opposite sides of the channel, which is filled with air. Air has relatively stable electromagnetic properties; under normal design and operating conditions, it will not significantly absorb or reflect the electromagnetic waves radiated by the antenna module 20. This ensures that the electromagnetic waves propagate within the cavity according to the expected path and manner, reducing energy loss and signal distortion during propagation, thereby improving the transmission quality and stability of the radar signal.

[0053] In other cases, the second support member 50 includes a second support layer with a third hollow area 511 along its thickness direction. The third hollow area 511 is connected to the first hollow area 31 and corresponds to the antenna module 20 to expose the antenna module 20, thereby avoiding the second support layer from blocking the antenna module 20. This ensures that millimeter waves can be successfully radiated from and received back from the antenna module 20, guaranteeing the normal transmission of radar signals.

[0054] The thickness of the second support layer is about 1 / 15 wavelength to 1 / 7 wavelength, for example, 1 / 10 wavelength, wherein the wavelength refers to the vacuum wavelength of the millimeter wave radar operating frequency band. It can be understood that when the thickness of the second support layer is much smaller than the wavelength, the phase delay and reflection loss of the electromagnetic wave passing through the second support layer can be ignored. When the frequency band of the electromagnetic wave is 24 GHz, the wavelength is 12.5 mm, and the thickness of the second support layer can be 0.8 mm to 1.8 mm; when the frequency band of the electromagnetic wave is 60 GHz, the wavelength is 5 mm, and the thickness of the second support layer can be 0.33 mm to 0.71 mm; when the frequency band of the electromagnetic wave is 77 GHz, the wavelength is 3.9 mm, and the thickness of the second support layer can be 0.26 mm to 0.56 mm.

[0055] Meanwhile, from the perspective of electromagnetic performance, the dielectric constant of the second support layer is less than 3. Because a lower dielectric constant can reduce the interference with the propagation of millimeter wave electromagnetic waves and reduce the energy loss of electromagnetic waves during propagation, the detection efficiency and accuracy of the radar are improved.

[0056] In the structural design of the second support layer, the area above the antenna module 20 is specially treated. This area adopts a hollow design, i.e., a third hollow area 511, and the larger the third hollow area 511 is, the better, but the premise is to ensure that the wave-transparent layer 60 will not collapse due to lack of support. This large-area hollow design can effectively reduce the blocking of the second support layer to millimeter waves, so that the electromagnetic wave can propagate more smoothly between the antenna module 20 and the wave-transparent layer 60, thereby improving the electromagnetic transmission efficiency of the radar.

[0057] The material of the second support layer can be selected from materials such as PC (Polycarbonate, polycarbonate) or LCP (Liquid Crystal Polymer, liquid crystal polymer) that are easy to obtain and have low loss to millimeter waves. PC material has good comprehensive performance, such as high strength, high toughness and heat resistance, etc., which can meet the use requirements of the radar in different working environments; LCP material has excellent heat resistance and low loss characteristics, which provides a strong guarantee for the high-performance operation of the radar.

[0058] In some cases, please refer to Figure 6 , Figure 6 The fifth structure diagram of the millimeter wave radar provided by the embodiment of the present application is shown. The second support layer also has a porous area 512, which is arranged on the side of the third hollow area 511. This design can significantly reduce the equivalent dielectric constant and loss of the material while ensuring that the second support layer has a certain mechanical strength. The porous structure allows the electromagnetic wave to pass through the material more freely during propagation, reducing the interaction between the electromagnetic wave and the material, thereby reducing energy loss and improving the transmission efficiency of the electromagnetic wave.

[0059] In some other cases, the second support layer also has a mesh region, which is also arranged at the periphery of the third hollow region 511. The mesh region can provide a smoother propagation channel for electromagnetic waves while ensuring structural strength, reducing electromagnetic wave reflection and scattering, and further optimizing the propagation characteristics of millimeter waves inside the radar.

[0060] Whether it is a porous region 512 or a mesh region, the equivalent dielectric constant of the second support layer can be reduced to below 1.5, reducing the propagation loss of millimeter waves in the 60GHz frequency band, to optimize the propagation characteristics of millimeter waves inside the radar. In terms of position layout, the porous region 512 or mesh region is formed within a range of about one wavelength from the third hollow region 511, because in this region, the electromagnetic wave has not yet formed a stable plane wave front, and its beam pattern is easily affected by the reflection and diffraction of the surrounding structure. By reasonably designing the structure of this region, the detection accuracy, anti-interference ability and working stability of the radar can be effectively improved, thereby improving the performance of the millimeter wave radar 100 in various application scenarios.

[0061] The thickness of the wave-transparent layer 60 is one-eighth of the dielectric wavelength. The dielectric wavelength refers to the wavelength of electromagnetic waves in the wave-transparent layer 60, and the relationship between the dielectric wavelength and the vacuum wavelength is as follows: (2) Wherein, is the wavelength of electromagnetic waves in the wave-transparent layer 60, is the wavelength of electromagnetic waves in vacuum, is the relative dielectric constant of the wave-transparent layer 60 material.

[0062] When the working frequency band of the millimeter wave radar 100 is 60GHz, taking PC (polycarbonate) material with a relative dielectric constant (εr) of 2.9 as an example, the thickness of the wave-transparent layer 60 is 0.37mm. This thickness makes the phase difference of the reflected waves at the two interfaces of the wave-transparent layer 60 180°, realizing destructive interference and improving the wave-transparent rate to more than 95%.

[0063] Wherein, the wave-transparent layer 60 and the second support 50 are integrally formed, effectively enhancing the connection strength between the two, effectively avoiding problems such as loosening and falling off that may occur due to insecure connection, and further improving the stability and reliability of the overall structure of the millimeter wave radar 100; Moreover, the integrally formed process reduces the gaps and interfaces that may exist in the traditional connection method, reducing the reflection and loss of electromagnetic waves at these parts, which helps to improve the propagation efficiency of millimeter waves inside the radar. The integrally formed process can be injection molding.

[0064] ​The millimeter wave radar 100 further comprises an ink layer arranged on the surface of the wave-transparent layer 60. The ink layer can be selected according to actual needs to have a non-metallic ink with a specific color, which plays a role of identification and differentiation, facilitates identification and operation in the production, assembly and maintenance process of the radar, and can also be part of the appearance of the millimeter wave radar 100 to realize multiple functions. The ink layer is a non-metallic ink. When the wave-transparent layer 60 is a transparent material, the ink layer can be arranged on the side of the wave-transparent layer 60 close to the second support 50 to improve stability.

[0065] For further reference, Figure 4 and Figure 6 The millimeter wave radar 100 further comprises a control chip 70, which can be an MCU (Microcontroller Unit) chip. The control chip 70 is arranged on the substrate 10 and is spaced apart from the antenna module 20, for example, the distance between the control chip 70 and the antenna module 20 can be greater than or equal to 5 mm, which can effectively avoid the influence of the heat generated by the control chip 70 in the working process on the antenna module 20, prevent the performance of the antenna module 20 from changing due to temperature rise, and also reduce the electromagnetic coupling interference between the control chip 70 and the antenna module 20, so as to ensure that the control chip 70 can accurately receive and send control signals, and the antenna module 20 can efficiently radiate and receive millimeter wave signals, thereby ensuring the stable operation and reliable work of the millimeter wave radar 100 as a whole.

[0066] For further reference, Figure 4 The first support layer has a fourth hollow area 412 along the thickness direction thereof, and the control chip 70 is arranged in the fourth hollow area 412, so that the second support layer has a flat surface.

[0067] For further reference, Figure 7 , Figure 7 The antenna pattern provided by the embodiment of the present application is: (1) the antenna pattern of the bare AOP antenna; (2) the antenna pattern of the AOP antenna after being installed on the substrate; (3) the antenna pattern of the millimeter wave radar provided by the embodiment of the present application. Through comparative analysis, it can be known that in the millimeter wave radar provided by the embodiment of the present application, the reflective layer 30 is spaced apart from the substrate, which corrects the phase deviation, so that the reflective layer 30 can effectively reflect the electromagnetic waves radiated by the antenna module 20, successfully overcoming the problem of phase deviation caused by the physical distance between the antenna module 20 and the circuit ground in the prior art, and effectively expanding the beam width.

[0068] The electronic device can be a television, a display screen, a washing machine, an air conditioner, a door lock, a refrigerator, or the like. The electronic device includes the millimeter wave radar 100, thereby endowing the electronic device with more excellent capabilities in safety protection, comfortable experience, health management, intelligent interaction, and the like.

[0069] The electronic device includes a housing that not only provides reliable physical protection for various components inside the electronic device against damage from external collisions, dust erosion, and water vapor intrusion, but also undertakes certain electromagnetic shielding and signal transmission functions to ensure stable operation of the electronic device in complex environments.

[0070] The millimeter wave radar 100 further includes a second support 50 and a wave-transparent layer 60. The second support 50 is arranged on a side of the reflective layer 30 away from the first support 40. The second support 50 has a third hollowed-out area 511 in the thickness direction thereof, which corresponds to the antenna module 20 to expose the antenna module 20, so that the antenna module 20 can radiate and receive millimeter wave signals without any obstruction, thereby realizing efficient electromagnetic interaction with a target and providing a guarantee for accurate acquisition of target information.

[0071] The wave-transparent layer 60 is arranged on a side of the second support 50 away from the reflective layer 30. The wave-transparent layer 60 can ensure that millimeter wave signals penetrate the layer with extremely low loss, and can also protect the internal structures such as the second support 50 and the reflective layer 30.

[0072] At least part of the housing is the wave-transparent layer 60, in other words, the wave-transparent layer 60 can serve as part of the housing. The millimeter wave radar 100 exists on the surface of the electronic device in a surface conformal manner. Such a conformal design makes the millimeter wave radar 100 perfectly integrated with the shell of the electronic device, not only improving the overall aesthetics of the electronic device, but more importantly, realizing unobstructed transmission of electromagnetic waves. Under such a design, millimeter wave signals can propagate between the electronic device and external targets without any obstruction, further improving the detection performance and reliability of the millimeter wave radar 100, and providing more solid technical support for intelligent applications of the electronic device.

[0073] The millimeter wave radar 100 further includes an ink layer arranged on the surface of the wave-transparent layer 60. The ink layer can select non-metallic ink with a specific color according to actual needs, and play a role in identification and differentiation, facilitating identification and operation during production, assembly, and maintenance of the millimeter wave radar 100. When the millimeter wave radar 100 exists on the surface of the electronic device in a surface conformal manner, the ink layer can also form pattern, label, and pattern, and other appearance elements on the electronic device.

[0074] In the above embodiments, the description of each embodiment is focused on, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0075] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0076] The millimeter wave radar and the electronic device provided by the embodiments of the present application are described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above embodiment descriptions are only used to help understand the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description should not be understood as limiting the present application.

Claims

1. A millimeter-wave radar, characterized in that, include: substrate; An antenna module, wherein the antenna module is disposed on the substrate; A reflective layer is provided at a distance from the substrate. A first cutout area is provided on the reflective layer, and the first cutout area is provided corresponding to the antenna module to expose the antenna module. A first support member is disposed between the substrate and the reflective layer.

2. The millimeter-wave radar according to claim 1, characterized in that, The distance between the substrate and the reflective layer is greater than or equal to the thickness of the antenna module.

3. The millimeter-wave radar according to claim 1 or 2, characterized in that, The first support member includes a first support layer, the first support layer is provided with a second hollow area, the first hollow area is connected to the second hollow area, and the antenna module is disposed in the second hollow area.

4. The millimeter-wave radar according to claim 3, characterized in that, The minimum distance between the projected outer contour of the reflective layer on the substrate and the projected outer contour of the antenna module on the substrate satisfies equation (1): （1） Wherein, D is the minimum distance between the projected outer contour of the reflective layer on the substrate and the projected outer contour of the antenna module on the substrate. The vacuum wavelength is the operating frequency band of the millimeter-wave radar.

5. The millimeter-wave radar according to claim 1 or 2, characterized in that, It also includes a second support member and a wave-transparent layer. The wave-transparent layer is disposed on the side of the second support member away from the reflective layer. The wave-transparent layer and the reflective layer are spaced apart. The second support member is disposed between the wave-transparent layer and the reflective layer. The second support member is connected to the wave-transparent layer and the reflective layer respectively.

6. The millimeter-wave radar according to claim 5, characterized in that, The second support member includes a second support layer, and the second support layer is provided with a third hollow area. The third hollow area is connected to the first hollow area and corresponds to the antenna module to expose the antenna module.

7. The millimeter-wave radar according to claim 6, characterized in that, The second support layer also has a porous region, which is disposed around the periphery of the third hollowed-out region.

8. The millimeter-wave radar according to claim 5, characterized in that, The wave-transparent layer is integrally formed with the second support member.

9. The millimeter-wave radar according to claim 5, characterized in that, It also includes an ink layer disposed on the surface of the wave-transparent layer.

10. The millimeter-wave radar according to claim 1 or 2, characterized in that, It also includes a control chip, which is disposed on the substrate and spaced apart from the antenna module.

11. An electronic device, characterized in that, Including the millimeter-wave radar as described in any one of claims 1 to 10.

12. The electronic device according to claim 11, characterized in that, It also includes a housing; the millimeter-wave radar further includes a second support member and a wave-transparent layer, the wave-transparent layer being disposed on the side of the second support member away from the reflective layer, the wave-transparent layer being spaced apart from the reflective layer, the second support member being disposed between the wave-transparent layer and the reflective layer, the second support member being connected to the wave-transparent layer and the reflective layer respectively; at least a portion of the housing is the wave-transparent layer.

Images