Millimeter wave radar and electronic device

Abstract

The application provides a millimeter wave radar and an electronic device. The millimeter wave radar comprises a substrate, an antenna module arranged on the substrate, a reflective layer arranged at a distance from the substrate, a first hollow area arranged on the reflective layer and corresponding to the antenna module to expose the antenna module, and a first support arranged between the substrate and the reflective layer. The millimeter wave radar can overcome the phase deviation problem.

Description

Technical Field

[0001] This utility model relates to the field of antenna technology, and in particular to a millimeter-wave radar and electronic equipment. Background Technology

[0002] Millimeter-wave radar is widely used in home appliances, becoming a key component for realizing intelligent functions in many appliances. Millimeter-wave radar often uses AOP (Antenna On Package) antennas with a three-dimensional integrated structure. This type of antenna is usually formed directly on the chip surface, and the chip itself is composed of a multi-layer circuit stack structure and a package structure. This stacked packaging architecture inevitably results in a specific package height for the chip as a whole, which in turn creates a significant physical distance between the AOP antenna and the circuit ground plane, which serves as the reference plane.

[0003] It is particularly noteworthy that when the operating frequency of the AOP antenna is increased to the millimeter wave or even the terahertz band, its electromagnetic wave wavelength is significantly shortened, and its sensitivity to the spatial relationship between the antenna and the reflector increases.

[0004] In this technological context, the conventional design approach of directly using the circuit ground metal surface as the electromagnetic wave reflecting surface in existing technical solutions cannot effectively overcome the phase deviation problem caused by the aforementioned physical spacing, and therefore cannot meet the technical requirements for optimizing antenna radiation characteristics in high-frequency application scenarios. Utility Model Content

[0005] This application provides a millimeter-wave radar and an electronic device that can overcome the phase deviation problem.

[0006] This application provides a millimeter-wave radar, including: 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.

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

[0008] In some embodiments, 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.

[0009] In some embodiments, 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.

[0010] In some embodiments, the millimeter-wave radar further 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.

[0011] In some embodiments, the second support member includes a second support layer, the second support layer having a third hollow area, the third hollow area communicating with the first hollow area, the third hollow area corresponding to the antenna module to expose the antenna module.

[0012] In some embodiments, the second support layer further has a porous region, which is disposed around the periphery of the third hollowed-out region.

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

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

[0015] In some embodiments, the millimeter-wave radar further includes an ink layer disposed on the surface of the wave-transparent layer.

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

[0017] This application also provides an electronic device, including the millimeter-wave radar described above.

[0018] In some embodiments, the electronic device further 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.

[0019] The millimeter-wave radar and electronic device provided in this application include a substrate, an antenna module, a first support member, and a reflective layer. The height of the reflective layer relative to the substrate is increased by the first support member, so that the reflective layer can effectively reflect the electromagnetic waves 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 improving the overall performance of the millimeter-wave radar. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the first structure of a millimeter-wave radar provided in an embodiment of this application.

[0022] Figure 2 This is a schematic diagram of a second structure of a millimeter-wave radar provided in an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of a third structure of millimeter-wave radar provided in an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of a fourth structure of millimeter-wave radar provided in an embodiment of this application.

[0025] Figure 5 for Figure 4 An explosion diagram.

[0026] Figure 6 This is a schematic diagram of the fifth structure of a millimeter-wave radar provided in an embodiment of this application.

[0027] Figure 7 Antenna patterns provided for embodiments of this application: (1) Antenna pattern of bare AOP antenna; (2) Antenna pattern of AOP antenna after it is mounted on a substrate; (3) Antenna pattern of millimeter-wave radar provided for embodiments of this application. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] This application provides a millimeter-wave radar and electronic device that can overcome the phase deviation problem. The following is a detailed description with reference to the accompanying drawings.

[0030] Please see Figure 1 as well as Figure 2 , Figure 1 This is a schematic diagram of a first structure of a millimeter-wave radar provided in an embodiment of this application. Figure 2 This is a schematic diagram of a second structure of a millimeter-wave radar provided in an embodiment of this application.

[0031] This application provides a millimeter-wave radar 100, including a substrate 10, an antenna module 20, a reflective layer 30, and a first support member 40.

[0032] The substrate 10 serves as the basic structural board in the millimeter-wave radar 100, providing physical support and electrical connections for the antenna module 20 and other components. The substrate 10 can be made of materials with good electrical and mechanical properties, such as printed circuit boards (PCBs).

[0033] Antenna module 20 is mounted on substrate 10. Antenna module 20 is responsible for converting electrical signals into electromagnetic waves in the millimeter-wave band for radiation, and for receiving millimeter-wave electromagnetic waves reflected back from the target and converting them back into electrical signals, thereby realizing the functions of signal transmission and reception. Its performance directly affects the detection accuracy, range and other indicators of millimeter-wave radar 100.

[0034] The antenna module 20 adopts a three-dimensional integrated structure, comprising an AOP antenna and a chip body. The AOP antenna is typically formed directly on the surface of the chip body; this integration method helps reduce the overall size of the antenna and improve integration density. The chip body is composed of a multi-layer circuit stack structure and a packaging structure. This stacked packaging architecture gives the chip body specific physical dimensions and characteristics, while also giving the antenna module 20 a specific package height. Due to this package height, a significant physical distance is formed between the AOP antenna and the ground plane of the substrate 10, which serves as the reference plane. This physical distance can affect the propagation characteristics of electromagnetic waves to some extent, potentially leading to phase deviation problems.

[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, the reflective surface of the reflective layer 30 is approximately level 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. This spaced arrangement allows the reflective layer 30 to correct the phase deviation between the AOP antenna and the ground plane 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. This overcomes the phase deviation problem caused by the physical distance between the antenna module 20 and the circuit ground in the prior art, 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 corresponding to the antenna module 20, so as to expose the antenna module 20 and ensure that the electromagnetic waves radiated by the millimeter wave antenna chip can be successfully propagated through the reflective layer 30. At the same time, the reflective layer 30 can still effectively reflect electromagnetic waves from other directions.

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

[0038] Please continue reading. Figure 2 A first support member 40 is disposed between the substrate 10 and the reflective layer 30. The first support member 40 can be connected to both the substrate 10 and the reflective layer 30 to support them and ensure that the reflective layer 30 can be stably positioned at a suitable height. Through the proper arrangement of the first support member 40, the distance between the reflective layer 30 and the substrate 10 can be precisely controlled, enabling the reflective layer 30 to accurately reflect the electromagnetic waves radiated by the millimeter-wave antenna chip. This effectively overcomes the phase deviation problem 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 level 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 play the role of reflecting 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 thus reducing the detection performance of the radar. When the distance is greater than or equal to the thickness of the antenna module 20, this interference can be reduced, allowing the reflective layer 30 to more effectively reflect the electromagnetic waves radiated by the antenna module 20, improving the utilization efficiency of electromagnetic waves and enhancing the overall performance of the millimeter-wave radar 100.

[0041] In some cases, the first support member 40 includes a first support frame, which is connected to the substrate 10 and the reflective layer 30 respectively, forming a channel. The first support frame is disposed between the substrate 10 and the reflective layer 30, which are located on opposite sides of the channel. The antenna module 20 is disposed within 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, ensuring that the electromagnetic waves propagate within the cavity according to the expected path and manner.

[0042] In other cases, please refer to [the relevant documentation]. Figure 2 The first support member 40 includes a first support layer. As a layered structure with a specific thickness, the first support layer plays a major supporting role in the first support member 40, maintaining an appropriate distance and relative position between the substrate 10 and the reflective layer 30 thanks to its good strength and stability. The first support layer has a second hollowed-out region 411 along its thickness direction. The first hollowed-out region 311 communicates with the second hollowed-out region 411. The antenna module 20 is disposed within the second hollowed-out region 411. This ensures that the antenna module 20 can be stably installed in a suitable position and also prevents the first support layer from blocking the antenna module 20 from radiating and receiving millimeter-wave electromagnetic waves, allowing electromagnetic waves to propagate without obstruction, thereby ensuring that the millimeter-wave radar 100 can perform its detection function normally.

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

[0044] When the first support member 40 takes the form of a first support layer, there are several feasible options for the formation of the first support layer and the reflective layer 30. One option is to perform a metal electroplating process on the first support layer. Metal electroplating is a mature surface treatment process that can uniformly deposit a thin metal film on the surface of the first support layer through electrochemical methods. This thin metal film has good conductivity and high reflectivity for millimeter waves, and can serve as a key component of the reflective layer 30, forming a structure that meets the design requirements together with the first support layer, achieving effective reflection of millimeter waves and stable structural support.

[0045] Another feasible approach is to directly form the first support layer and reflective layer 30 using a hole-punching process on a single-sided copper-plated circuit board. Single-sided copper-plated circuit boards are a common and readily available type of circuit board, with a layer of copper foil on one side. During manufacturing, mechanical processing methods such as drilling and milling, or chemical etching methods, are used to etch the copper foil and circuit board substrate with a specific chemical solution, creating holes of specific shapes and sizes on the circuit board. These holes form the hollow structure of the first support layer, while the remaining copper foil portion serves as the reflective layer 30, thus directly obtaining the first support layer and reflective layer 30 with the desired structure. This manufacturing method has advantages such as relatively simple process, low cost, and high production efficiency, making it suitable for large-scale production of millimeter-wave radar 100.

[0046] Please see Figure 3 , Figure 3 This is a schematic diagram of a third structure of millimeter-wave radar provided in an embodiment of this application.

[0047] The distance between the outer contour of the projection of the reflective 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 vacuum wavelength in the operating frequency band of the millimeter-wave radar 100. That is, the minimum distance between the outer contour of the projection of the reflective layer 30 on the substrate 10 and the outer contour of the projection of the antenna module 20 on the substrate 10 satisfies equation (1): (1) Where D is the distance between the outer contour of the projection of the reflective layer 30 on the substrate 10 and the outer contour of the projection of the antenna module 20 on the substrate 10. This refers to the vacuum wavelength of the millimeter-wave radar operating frequency band 100.

[0048] Effective reflection of electromagnetic waves is only possible when D is greater than or equal to the length of a wavelength. In this case, after the electromagnetic wave strikes the reflective layer 30, it will be reflected back at a specific angle according to the law of reflection, thereby achieving effective control over the propagation path of the electromagnetic wave, optimizing the electromagnetic radiation characteristics of the equipment, and improving the detection accuracy and range of the equipment against the target. For example, when the millimeter-wave radar 100 operates at a frequency of 60 GHz, The value is 5mm, and D is greater than or equal to 5mm; when the millimeter-wave radar 100 operates at a frequency of 77GHz. The diameter 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 approximately 1 / 15 to 1 / 7 of the wavelength, for example, 1 / 10 of the wavelength, where the wavelength refers to the vacuum wavelength of the millimeter-wave radar operating frequency band. It is 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 are negligible. When the electromagnetic wave frequency band 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 electromagnetic wave frequency band 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 electromagnetic wave frequency band 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 an electromagnetic performance perspective, the dielectric constant of the second support layer is less than 3. A lower dielectric constant reduces interference with millimeter-wave electromagnetic wave propagation, lowers energy loss during propagation, and improves radar detection efficiency and accuracy.

[0056] In the structural design of the second support layer, special treatment was applied to the area above the antenna module 20. This area adopts a hollow design, namely the third hollow area 511, and the larger the third hollow area 511, the better, provided that the wave-transparent layer 60 does not collapse due to lack of support. This large hollow design can effectively reduce the obstruction of millimeter waves by the second support layer, allowing electromagnetic waves to 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 for this second support layer can be readily available and low-loss for millimeter waves, such as PC (Polycarbonate) or LCP (Liquid Crystal Polymer). PC material has excellent comprehensive properties, such as high strength, high toughness, and heat resistance, which can meet the requirements of radar in different operating environments; LCP material, with its excellent heat resistance and low-loss characteristics, provides a strong guarantee for the high-performance operation of the radar.

[0058] In some cases, please refer to Figure 6 , Figure 6 This is a schematic diagram of a fifth structure of a millimeter-wave radar provided in an embodiment of this application. The second support layer also has a porous region 512, which is disposed around the periphery of the third hollowed-out region 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 electromagnetic waves to pass through the material more freely during propagation, reducing the interaction between electromagnetic waves and the material, thereby reducing energy loss and improving the transmission efficiency of electromagnetic waves.

[0059] In other cases, the second support layer also has a mesh region, which is also located around 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] Both the porous region 512 and the mesh region can reduce the equivalent dielectric constant of the second support layer to below 1.5, thereby reducing the propagation loss of millimeter waves in the 60GHz band and optimizing the propagation characteristics of millimeter waves inside the radar. In terms of location, the porous region 512 or the mesh region is formed within approximately one wavelength of the third hollow region 511. This is because in this region, the electromagnetic wave has not yet formed a stable planar wavefront, and its beam pattern is easily affected by reflection and diffraction from surrounding structures. By rationally designing the structure of this region, the radar's detection accuracy, anti-interference capability, and operational stability can be effectively improved, thus enhancing 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 wavelength of the medium. The wavelength of the medium refers to the wavelength of the electromagnetic wave in the wave-transparent layer 60, and the relationship between the wavelength of the medium and the vacuum wavelength is as follows (2): (2) in, The wavelength of the electromagnetic wave in the wave-transparent layer 60. The wavelength of electromagnetic waves in a vacuum. is the relative permittivity of the wave-transparent layer 60 material.

[0062] When the millimeter-wave radar 100 operates at a frequency of 60 GHz, and the wave-transmitting layer 60 is the relative permittivity ( Taking PC (polycarbonate) material with a particle size of 2.9 as an example, the thickness of the wave-transparent layer 60 is 0.37 mm. This thickness makes the phase difference of the reflected waves at the two interfaces of the wave-transparent layer 60 180°, achieving destructive interference and increasing the wave transmittance to over 95%.

[0063] The wave-transparent layer 60 and the second support member 50 are integrally formed, effectively enhancing the connection strength between them and avoiding problems such as loosening or detachment that may occur due to weak connections. This, in turn, improves the overall stability and reliability of the millimeter-wave radar 100 structure. Moreover, the integral forming process reduces gaps and interfaces that may exist in traditional connection methods, reducing electromagnetic wave reflection and loss in these areas and helping to improve the propagation efficiency of millimeter waves inside the radar. This integral forming process can be injection molding.

[0064] The millimeter-wave radar 100 also includes an ink layer disposed on the surface of the wave-transparent layer 60. The ink layer can be made of non-metallic ink of a specific color, selected according to actual needs, serving as an identifier and distinguishing element to facilitate identification and operation during radar production, assembly, and maintenance. It can also be used as part of the millimeter-wave radar 100's appearance, enabling multiple functions. This ink layer is made of non-metallic ink. When the wave-transparent layer 60 is a transparent material, the ink layer can be disposed on the side of the wave-transparent layer 60 closer to the second support member 50 to improve stability.

[0065] Please continue reading for more details. Figure 4 as well as Figure 6 The millimeter-wave radar 100 also includes a control chip 70, which can be an MCU (Microcontroller Unit) chip. The control chip 70 is mounted 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 5mm. This effectively prevents the heat generated by the control chip 70 during operation from affecting the antenna module 20, preventing performance changes in the antenna module 20 due to temperature increases. Simultaneously, it reduces electromagnetic coupling interference between the control chip 70 and the antenna module 20, ensuring that the control chip 70 can accurately receive and transmit control signals, and that the antenna module 20 can efficiently radiate and receive millimeter-wave signals, thereby guaranteeing the overall stable and reliable operation of the millimeter-wave radar 100.

[0066] Please continue reading. Figure 4 The first support layer has a fourth hollow area 412 along its thickness direction, and the control chip 70 is disposed in the fourth hollow area 412 so that the second support layer achieves a flat surface.

[0067] Please see Figure 7 , Figure 7 Antenna patterns provided for embodiments of this application: (1) Antenna pattern of a bare AOP antenna; (2) Antenna pattern of an AOP antenna mounted on a substrate; (3) Antenna pattern of a millimeter-wave radar provided for embodiments of this application. Comparative analysis shows that in the millimeter-wave radar provided for embodiments of this application, the phase deviation is corrected by the spaced reflective layer 30 from the substrate, enabling the reflective layer 30 to effectively reflect the electromagnetic waves radiated by the antenna module 20. This successfully overcomes 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 expands the beamwidth.

[0068] This application provides an electronic device, which can be a television, display screen, washing machine, air conditioner, door lock, refrigerator, or other similar device. The electronic device includes the aforementioned millimeter-wave radar 100, thereby endowing the electronic device with superior capabilities in areas such as security protection, comfort experience, health management, and intelligent interaction.

[0069] Electronic devices include a housing, which not only provides reliable physical protection for the various components inside the electronic device, preventing them from being damaged by external impacts, dust corrosion, and moisture intrusion, but also undertakes certain electromagnetic shielding and signal transmission functions to ensure that the electronic device can operate stably in complex environments.

[0070] The millimeter-wave radar 100 also includes a second support member 50 and a wave-transparent layer 60. The second support member 50 is disposed on the side of the reflective layer 30 away from the first support member 40. The second support member 50 has a third hollow area 511 in its thickness direction. The third hollow area 511 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 obstruction, thereby realizing efficient electromagnetic interaction with the target and providing a guarantee for accurately obtaining target information.

[0071] The wave-transparent layer 60 is located on the side of the second support member 50 away from the reflective layer 30. The wave-transparent layer 60 is located on the side of the second support member 50 away from the reflective layer 30. This can ensure that the millimeter wave signal can pass through the layer with extremely low loss. At the same time, it can also play a certain role in protecting the internal structures such as the second support member 50 and the reflective layer 30.

[0072] At least a portion of the housing is a wave-transparent layer 60; in other words, this wave-transparent layer 60 can be part of the housing. The millimeter-wave radar 100 exists conformally on the surface of the electronic device. This conformal design allows the millimeter-wave radar 100 to seamlessly integrate with the housing of the electronic device, not only enhancing the overall aesthetics of the electronic device but, more importantly, enabling unobstructed transmission of electromagnetic waves. With this design, millimeter-wave signals can propagate unimpeded between the electronic device and external targets, further improving the detection performance and reliability of the millimeter-wave radar 100 and providing stronger technical support for the intelligent application of electronic devices.

[0073] The millimeter-wave radar 100 also includes an ink layer disposed on the surface of the wave-transparent layer 60. The ink layer can be made of non-metallic ink of a specific color, selected according to actual needs, serving as an identifier and distinguishing element, facilitating identification and operation during the production, assembly, and maintenance of the millimeter-wave radar 100. When the millimeter-wave radar 100 exists conformally on the surface of the electronic device, the ink layer can also form visual elements such as patterns, labels, and designs on the electronic device.

[0074] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0075] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0076] The millimeter-wave radar and electronic equipment provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this 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.

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