Antenna device and millimeter wave radar

Abstract

The application discloses an antenna device and a millimeter wave radar, and relates to the technical field of antennas. The antenna device is applied to the millimeter wave radar. The millimeter wave radar comprises a shell. The antenna device comprises a signal module and an adjusting assembly. The signal module is arranged in the shell and emits or receives millimeter wave signals towards the outside of the shell to form a radiation field inside the shell. The adjusting assembly is arranged between the shell and the signal module. The adjusting assembly has a spatial impedance value different from that of air and is used for guiding the propagation of the millimeter wave signals to adjust the radiation characteristics of the radiation field in each direction. The application can reduce the design restrictions on the shape and thickness of the shell and is beneficial to further optimizing the detection performance of the millimeter wave radar.

Description

TECHNICAL FIELD

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

[0002] The millimeter wave radar is a device for transmitting and receiving signals by using millimeter waves. For example, after the radar transmits millimeter waves, it receives reflected signals from the target, and determines the position, speed and other information of the target by analyzing these signals, so that it can be applied to the field of vehicle-mounted radar.

[0003] In the related art, the millimeter wave radar includes a shell and a signal module, the signal module is arranged inside the shell, and is used for transmitting or receiving millimeter wave signals towards the outside of the shell to form a radiation field. However, since the millimeter wave signals are approximately uniformly radiated in all directions in the air, in order to avoid phase distortion of the millimeter wave signals propagating between the signal module and the inner wall of the shell, the distance value between all positions of the signal module and the inner wall of the shell needs to be kept as 0.5n times the wavelength value of the millimeter wave as much as possible. In addition, in order to avoid the interference between the reflected wave and the transmitted wave when the millimeter wave passes through the shell, resulting in energy loss, the thickness value of the shell also needs to be kept as 0.5n times the equivalent medium wavelength value as much as possible. In view of this, the design shape and thickness of the shell are required to be high, which is not conducive to ensuring the detection performance of the millimeter wave radar. SUMMARY

[0004] The main purpose of the present application is to provide an antenna device and a millimeter wave radar, which aims to reduce the design restrictions on the shape and thickness of the shell, and at the same time is conducive to optimizing the detection performance of the millimeter wave radar.

[0005] To achieve the above purpose, the antenna device provided by the present application is applied to a millimeter wave radar, the millimeter wave radar includes a shell, the antenna device includes a signal module and an adjusting assembly, the signal module is arranged inside the shell, the signal module includes an antenna unit, the antenna unit is used for transmitting or receiving millimeter wave signals towards the outside of the shell to form a radiation field inside the shell; the adjusting assembly is arranged between the shell and the signal module, the adjusting assembly has a spatial impedance value different from that of air, and is used for guiding the propagation of the millimeter wave signals to adjust the radiation characteristics of the radiation field in each direction.

[0006] In an embodiment, the adjusting assembly includes a dielectric piece, the dielectric piece has a dielectric constant value higher than that of air, and is used for the millimeter wave signals to penetrate, reflect or diffract.

[0007] In an embodiment, the dielectric piece includes a circular arc body, and the concave side of the circular arc body is arranged towards the shell.

[0008] In an embodiment, the medium piece further comprises a strip-shaped body extending in a horizontal direction and arranged on the concave side of the arc-shaped body. In addition, a plurality of supporting bodies are arranged on the side of the medium piece facing the signal module, and the supporting bodies are connected to the peripheral side of the signal module.

[0009] In an embodiment, a plurality of stepped portions are arranged on the side of the medium piece facing the shell and spaced apart in a horizontal direction perpendicular to the medium piece.

[0010] In an embodiment, the medium piece comprises two spaced-apart supporting portions, a connecting portion connecting the two supporting portions, and the connecting portion is formed with a groove on the side facing the signal module.

[0011] In an embodiment, the adjustment assembly comprises a conductor piece, and the conductor piece is provided with a gap in the thickness direction for interference and superposition of the millimeter wave signal.

[0012] In an embodiment, the conductor piece is a symmetrical structure.

[0013] In an embodiment, the conductor piece comprises a plurality of sub-conductors, and the sub-conductors are uniformly and spaced apart arranged in a horizontal direction, and the gap is formed by the two adjacent sub-conductors.

[0014] In an embodiment, the conductor piece is provided with a plurality of gaps arranged in an array.

[0015] In an embodiment, the distance from the conductor piece to the antenna unit of the signal module is 0.4n to 0.6n times the wavelength of the millimeter wave signal, wherein n is a positive integer.

[0016] In an embodiment, the adjustment assembly further comprises a flexible circuit board, one side of the flexible circuit board is bonded to the inner wall of the shell, and the other side facing the signal module is used for attaching to the conductor piece.

[0017] The application further provides a millimeter wave radar, which comprises a shell, a control module and an antenna device as described above, the signal module is arranged in the shell, the control module and the signal module are electrically connected to control the radio frequency signal of the signal module.

[0018] In the technical solution of the present invention, the antenna device is applied to the millimeter wave radar and includes two parts: a signal module and an adjustment component. The signal module is responsible for transmitting and receiving millimeter wave signals to form a radiation field that interacts with external target objects; the adjustment component is arranged between the shell and the signal module. Since it has a spatial impedance that is inconsistent with that of air, for example, it can converge, tilt, and diverge the millimeter wave signal beam, thereby playing a role in adjusting the radiation characteristics of the radiation field in all directions. This is conducive to avoiding the need for the distance value between the signal module and all positions on the inner wall of the shell to be maintained at 0.5n times the millimeter wave wavelength value, and it can also avoid the need for the shell thickness value to be maintained at 0.5n times the equivalent medium wavelength value. Based on this, the design restrictions on the shape and thickness of the shell can be reduced, making the appearance of the shell beautiful, while also helping to ensure the detection performance of the millimeter wave radar. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an embodiment of a millimeter-wave radar provided by the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the signal module;

[0022] Figure 3 for Figure 1 A schematic structural diagram of an embodiment of a middle adjustment assembly including a dielectric member;

[0023] Figure 4 for Figure 1 A schematic structural diagram of another embodiment of the middle adjustment assembly including a dielectric member;

[0024] Figure 5 for Figure 1 A schematic structural diagram of another embodiment of the middle adjustment assembly including a dielectric member;

[0025] Figure 6 for Figure 1 A schematic structural diagram of another embodiment of the middle adjustment assembly including a dielectric member;

[0026] Figure 7 for Figure 1 Radiation pattern of an embodiment of a millimeter-wave radar;

[0027] Figure 8Structure schematic diagram of another embodiment of the millimeter wave radar provided by the present application;

[0028] Figure 9 For Figure 8 Structure schematic diagram of an embodiment of the adjusting assembly including the conductor piece;

[0029] Figure 10 For Figure 8 Structure schematic diagram of another embodiment of the adjusting assembly including the conductor piece;

[0030] Figure 11 For Figure 8 Structure schematic diagram of still another embodiment of the adjusting assembly including the conductor piece;

[0031] Figure 12 For Figure 8 Structure schematic diagram of another embodiment of the adjusting assembly including the conductor piece;

[0032] Figure 13 For Figure 8 Structure schematic diagram of various embodiments when the conductor piece is in a non-strip shape;

[0033] Figure 14 For Figure 8 Radiation pattern of an embodiment of the millimeter wave radar.

[0034] Brief description of the drawings: 100, millimeter wave radar; 10, antenna device; 1, signal module; 11, dielectric substrate; 13, antenna unit; 131, slot; 15, feed network; 16, transmitting array; 17, receiving array; 18, ground plane; 3, adjusting assembly; 31, dielectric piece; 311, circular arc body; 313, strip body; 315, support body; 317, stepped portion; 3171, sub-step; 3181, support portion; 3183, connecting portion; 3185, groove; 33, conductor piece; 331, sub-conductor; 333, slit; 50, shell; 60, control module.

[0035] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, motion condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0038] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0039] The millimeter wave radar is a device that uses millimeter waves for signal transmission and reception. For example, after the radar transmits millimeter waves, it receives reflected signals from the target, and determines the position, speed, etc. of the target by analyzing these signals, so it can be applied to vehicle-mounted radars and other fields.

[0040] At present, the millimeter wave radar products applied in the Internet of Things include 24G radars and 60G radars, which usually use millimeter wave modules with integrated antennas. When the module is applied to the product, the structure of the product has a great influence, especially the plastic shell, which needs to strictly meet the design specifications to avoid serious performance degradation. The shell thickness should be equal to 0.5n times the equivalent wavelength, and the distance between the shell and the antenna unit should be equal to 0.5n times the free space wavelength, which is contradictory to the appearance design of the product at this time.

[0041] For example, in the related art, a millimeter wave radar includes a shell and a signal module, the signal module is arranged inside the shell, and is used for transmitting or receiving millimeter wave signals towards the outside of the shell to form a radiation field. However, since the millimeter wave signals are approximately uniformly radiated in all directions in the air, in order to avoid phase distortion of the millimeter wave signals propagating between the signal module and the inner wall of the shell, the distance values between all positions of the signal module and the inner wall of the shell need to be kept as 0.5n times the millimeter wave wavelength values as much as possible, in addition, in order to avoid energy loss caused by interference cancellation of reflected waves and transmitted waves when the millimeter wave passes through the shell, the shell thickness value also needs to be kept as 0.5n times the equivalent medium wavelength value as much as possible. In view of this, the design shape and thickness of the shell are required to be high, which is not conducive to ensuring the detection performance of the millimeter wave radar.

[0042] To solve the above problems, the antenna device 10 provided in the application scheme aims to reduce the design restrictions on the shape and thickness of the shell 50 while ensuring the detection performance of the millimeter wave radar 100.

[0043] Reference Figures 1 to 14 In an embodiment of the application, the antenna device 10 is applied to a millimeter wave radar 100, the millimeter wave radar 100 includes a shell 50, the antenna device 10 includes a signal module 1 and an adjusting assembly 3, the signal module 1 is arranged inside the shell 50 and is used for transmitting or receiving millimeter wave signals towards the outside of the shell 50 to form a radiation field inside the shell 50; the adjusting assembly 3 is arranged between the shell 50 and the signal module 1, the adjusting assembly 3 has a spatial impedance value different from that of air, and is used for guiding the propagation of the millimeter wave signals to adjust the radiation characteristics of the radiation field in each direction.

[0044] Among them, the antenna device 10 of the application scheme is not only suitable for the millimeter wave radar 100, but also suitable for other electronic devices. The antenna device 10 of the application scheme is not only suitable for millimeter wave electromagnetic signals, but also suitable for other high-frequency electromagnetic signals. The shell 50 can be plastic or metal, and can be of any shape.

[0045] The signal module 1, i.e. the millimeter wave module, can be a PCBA module or an integrated semiconductor chip, for example, referring to Figure 2 The signal module 1 can include a dielectric substrate 11, an antenna unit 13, a feed network 15 and a ground plane 18, Figure 2The four antenna units 13 on the left side constitute a transmitting array 16, and the four antenna units 13 on the right side constitute a receiving array 17. The antenna units 13 are provided with slots 131 for impedance matching, thereby improving the communication performance of the signal module 1 as a whole. In the second embodiment of the signal module 1, a radio frequency signal processing chip is integrated on the dielectric substrate, and no antenna is included. The antenna units are designed on the control module or any other place, and the chip is connected to the antenna units through microstrip lines, coaxial lines, or the like. In the third embodiment of the signal module, the radio frequency circuit is designed on the control module and integrated with the driving circuit, responsible for processing radio frequency signals and realizing wireless communication and control functions. In the fourth embodiment of the signal module, the chip integrated circuit, the radio frequency circuit, and the antenna unit are integrally integrated on the chip. Therefore, the antenna device 10 is suitable for various types of signal modules 1, and is conducive to further meeting the use requirements of users.

[0046] The spatial impedance value of the adjusting assembly 3 is different from air, which can change the radiation characteristics of the radiation field, including directivity, intensity, and distribution, and is helpful to improve the detection accuracy and coverage range of the radar system. By introducing materials with variable permittivity or permeability, dynamic adjustment of the spatial impedance value can be realized to adapt to different working conditions and application scenarios. The adjusting assembly 3 can be at any distance from the shell 50.

[0047] In the technical solution of the present application, the antenna device 10 is applied to a millimeter wave radar 100, which includes a signal module 1 and an adjusting assembly 3. The signal module 1 is responsible for transmitting and receiving millimeter wave signals to form a radiation field that interacts with external target objects. The adjusting assembly 3 is arranged between the shell 50 and the signal module 1. Due to the spatial impedance value being different from air, the adjusting assembly 3 can perform beam focusing, tilting, and divergence on the millimeter wave signals, thereby adjusting the radiation characteristics of the radiation field in different directions. Therefore, it is beneficial to avoid the distance value between the signal module 1 and all positions on the inner wall surface of the shell 50 being required to be 0.5n times the millimeter wave wavelength value, and the shell thickness value being required to be 0.5n times the equivalent medium wavelength value. Based on this, the design restrictions on the shape and thickness of the shell 50 can be reduced, the appearance of the shell 50 can be made more beautiful, and the detection performance of the millimeter wave radar 100 can be ensured.

[0048] Reference Figures 1 to 14 In an embodiment of the present application, the adjusting assembly 3 includes a dielectric member 31 having a permittivity value higher than that of air for the millimeter wave signals to penetrate, reflect, or diffract.

[0049] The dielectric member 31 can be designed in any shape, and the material can be an insulating material such as plastic. Reference Figures 2 to 6The medium piece 31 can be arc-shaped, stepped, strip-shaped or combined, etc. The adjusting assembly 3 can further include other components for assisting the installation of the medium piece 31, such as a buckle, etc. to facilitate the installation and disassembly of the medium piece 31.

[0050] In this embodiment, the medium piece 31 replaces the air around the signal module 1. Since the medium piece 31 has a dielectric constant higher than that of air, it can affect the phase change of the millimeter wave signal when passing through the shell 50, optimize the radiation pattern of the signal module 1 radiation field, and improve the gain of the signal module 1 radiation field in a specific direction. At the same time, the medium piece 31 can avoid the shell 50 directly reflecting the millimeter wave signal back to the signal module 1, reducing the impact on the performance of the signal module 1 due to reflection.

[0051] Optionally, the medium piece 31 is designed with a periodic structure such as a strip-shaped unit or a gap unit to further optimize the phase adjustment and achieve more precise radiation field control. Using a multi-layer medium piece 31 can provide more phase adjustment options to optimize the radiation characteristics.

[0052] Referring to Figure 1 and Figure 3 In an embodiment of the present application, the medium piece 31 includes a circular arc body 311, and the concave side of the circular arc body 311 is arranged towards the shell 50.

[0053] In this embodiment, the design of the circular arc body 311 helps to concentrate the signal and make it propagate along a predetermined direction, improving the main lobe gain of the millimeter wave radar 100. Arranging the concave side towards the shell 50 can better control the reflection and diffraction behavior of the signal, reducing unnecessary scattering and thus improving the clarity of the signal. This geometry helps to reduce the overall volume of the antenna while maintaining good performance.

[0054] Referring to Figure 1 and Figure 4 In an embodiment of the present application, the medium piece 31 further includes a strip-shaped body 313 extending in the horizontal direction and arranged on the concave side of the circular arc body 311. And / or, the side of the medium piece 31 facing the signal module 1 is provided with a plurality of support bodies 315, and the plurality of support bodies 315 are respectively connected to the peripheral side of the signal module 1.

[0055] In this embodiment, the strip-shaped body 313 is added to the concave side of the circular arc facing the shell 50, which can further optimize the propagation path of the millimeter wave signal. By changing the propagation direction of the electromagnetic wave inside the medium piece 31, the space impedance around the signal module 1 is further changed, thereby further optimizing the radiation characteristics of the radiation field and improving the gain of the signal module 1 in a specific direction.

[0056] Optionally, the bar-shaped body 313 can be designed in different widths and lengths to optimize the propagation path of the millimeter wave. The bar-shaped body 313 can also be designed in a certain arrangement, such as an array arrangement, to achieve finer phase adjustment.

[0057] Optionally, a plurality of support bodies 315 are further added on the basis of the arc-shaped body 311 and the bar-shaped body 313. The design of the support body 315 can provide support and positioning for the arc-shaped body 311 and the bar-shaped body 313, ensure the propagation of the millimeter wave signal of the signal module 1 towards the medium piece 31, and reduce the performance degradation caused by mechanical vibration or temperature change.

[0058] Referring to Figures 1 to 6 In an embodiment of the present application, a plurality of stepped portions 317 are protruded from a side of the medium piece 31 towards the shell 50, and the plurality of stepped portions 317 are arranged in a horizontal direction perpendicular to the medium piece 31.

[0059] In the embodiment, the design of the stepped portion 317 can achieve multi-stage reflection or diffraction of the millimeter wave signal, which helps to control the diffusion angle of the signal and improve the angle resolution capability of the millimeter wave radar 100. At the same time, the design of the stepped portion 317 can make the change of the dielectric constant between the medium piece 31 and the air more smooth, and can improve the impedance matching between the medium piece 31 and the shell 50, reducing the energy loss caused by mismatching.

[0060] Optionally, each stepped portion can further include a plurality of sub-steps 3171 with different protruding lengths to further adjust the propagation of the millimeter wave signal.

[0061] Referring to Figure 5 In an embodiment of the present application, the medium piece 31 includes two spaced support portions 3181 and a connecting portion 3183 connecting the two support portions 3181, the two support portions 3181 are respectively connected to the side of the signal module 1, and the connecting portion 3183 is formed with a groove 3185 towards the side of the signal module 1.

[0062] The connecting portion 3183 is generally in a strip shape.

[0063] In the embodiment, the existence of the groove 3185 can further control the reflection propagation path of the millimeter wave signal, which helps to reduce unnecessary scattering of the millimeter wave signal and improve the signal-to-noise ratio of the millimeter wave radar 100. The connecting portion 3183 can change the radiation characteristics of a certain extension direction of the radiation field, thereby optimizing the radiation characteristics of the radiation field and improving the gain of the radiation field in a certain direction. The design of the two support portions 3181 can provide better support stability, ensure the contact between the medium piece 31 and the signal module 1, and reduce the performance degradation caused by mechanical vibration or temperature change.

[0064] Referring toFigure 8 In an embodiment of the present application, the adjusting assembly 3 comprises a conductor piece 33, and the conductor piece 33 is provided with a slit 333 in the thickness direction for interference superposition of the millimeter wave signals.

[0065] The conductor piece 33 can be designed in any shape, with different slit 333 spacing or strip size, thickness, etc. A strip unit or a slit unit can be used with a certain periodic repeating structure to have a better adjusting effect.

[0066] In this embodiment, by controlling the position and size of the slit 333, the phase modulation of the millimeter wave signal can be realized, and then the propagation direction of the millimeter wave signal is controlled. Through the interference superposition of the slit 333, a specific beam shape can be generated, which helps to improve the detection accuracy and coverage range of the millimeter wave radar 100.

[0067] Referring to Figures 9 to 13 In an embodiment of the present application, the conductor piece 33 is a symmetrical structure.

[0068] The conductor piece 33 can be an axisymmetric or central symmetric structure. For example, referring to Figures 9 to 11 The conductor piece 33 can be Figure 9 a regular strip, or Figure 10 an irregular strip, or Figure 11 a strip block with a certain thickness, and then referring to Figure 12 The shape of the conductor piece 33 can also be various deformations based on the strip and slit units.

[0069] In this embodiment, the symmetrical structure helps to simplify the design and manufacturing process of the conductor piece 33, and also facilitates the symmetrical distribution of the signal. The symmetrical design can reduce signal distortion and improve the overall performance of the millimeter wave radar 100, especially for application scenarios that require high-precision angle measurement. Symmetry also means that the antenna can provide consistent performance in multiple directions, which is particularly important for millimeter wave radars 100 that require omnidirectional coverage.

[0070] Referring to Figures 9 to 11 In an embodiment of the present application, the conductor piece 33 comprises a plurality of sub-conductors 331, and the plurality of sub-conductors 331 are uniformly spaced in the horizontal direction, and the adjacent two sub-conductors 331 enclose the slit 333.

[0071] The sub-conductor 331 can be implemented using a copper foil and be disposed on a flexible circuit board or a printed circuit board, which facilitates the integration of the conductor piece 33 to reduce the volume of the millimeter wave radar 100. The shape of the sub-conductor 331 can be a strip shape.

[0072] In this embodiment, the arrangement of the sub-conductors 331 can achieve precise control of the signal phase, which helps to generate the required beam shape and improve the detection accuracy of the millimeter wave radar 100. The multiple array arranged slits 333 can achieve beam scanning through phase control, which is crucial for the dynamic tracking capability of the millimeter wave radar 100. This design can achieve multi-path propagation of signals, which helps to improve the angle resolution and coverage range of the millimeter wave radar 100, and increase the lobe gain of the millimeter wave radar 100 radiation field.

[0073] With reference to Figure 12 In an embodiment of the present application, the conductor piece 33 is provided with multiple array arranged slits 333.

[0074] In this embodiment, the array arranged slit 333 design in the same conductor piece 33 can simplify the design and manufacturing process of the antenna, especially for application scenarios that require high density slit 333 arrangement, to further meet the production and use requirements.

[0075] With reference to Figure 8 In an embodiment of the present application, the distance from the conductor piece 33 to the antenna unit 13 of the signal module 1 is 0.4n to 0.6n times the wavelength of the millimeter wave signal, where n is a positive integer.

[0076] In this embodiment, the distance between the conductor piece 33 and the signal module 1 is set to an integer multiple of the wavelength of the millimeter wave signal, such as 0.4n to 0.6n times the wavelength of the millimeter wave signal, and preferably 0.5n times the wavelength of the millimeter wave signal, which can ensure that the phase change experienced by the millimeter wave signal during transmission is minimal. This is because a distance of 0.5n times the wavelength can ensure that the signal is minimally affected by spatial impedance changes during transmission, reducing phase distortion and loss of the millimeter wave signal.

[0077] With reference to Figure 8 In an embodiment of the present application, the adjusting assembly 3 further comprises a flexible circuit board, one side of the flexible circuit board is bonded to the inner wall of the shell 50, and the other side facing the signal module 1 is used to be attached to the conductor piece 33.

[0078] In this embodiment, the flexible circuit board can adapt to different shell shapes and sizes due to its flexibility, making the installation and maintenance of the conductor piece 33 much simpler. It not only provides stable physical connection, but also simplifies the process of electrical connection, thereby reducing assembly time and cost.

[0079] Optionally, the conductor piece 33 is connected to the circuit board by bonding or bonding.

[0080] The application further provides a millimeter wave radar 100, which comprises a shell 50, a control module 60 and the antenna device 10 as described above, the signal module 1 is arranged in the shell 50; the control module 60 is electrically connected with the signal module 1 to control the radio frequency signal of the signal module 1.

[0081] The specific structure of the antenna device 10 is referred to the above-mentioned embodiments, since the millimeter wave radar 100 adopts all the technical solutions of the above-mentioned embodiments, at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0082] The control module 60 comprises a controller and a main control circuit board, the controller is arranged on the main control circuit board and is electrically connected with the radio frequency circuit of the signal module 1 to control the radio frequency signal of the signal module 1.

[0083] In summary, the specific working principle of the antenna device 10 and the millimeter wave radar 100 can be referred to as follows: when the signal module 1 is transmitting or receiving, after one antenna unit 13 of the signal module 1 is excited, the surrounding space filling material will in turn affect and change the primary radiation field of the antenna to form the final antenna radiation field; generally, the primary radiation field can be optimized by designing and arranging the filling material around the antenna, including changing the directional gain and lobe angle, reducing interference, reducing the influence of the rear filling material, etc., the reasons are as follows:

[0084] (1) changing the space impedance around the antenna unit 13: after increasing the medium or metal conductor around the antenna unit 13, the space originally filled with air is replaced by the medium and the conductor, the medium and the conductor have different electrical parameters such as dielectric constant, dielectric loss factor and conductivity from air, which changes the space impedance around the antenna unit 13 and thus changes the radiation characteristics of the antenna unit 13 of the signal module 1.

[0085] (2) using the delay or acceleration difference of millimeter wave signals in different directions to form millimeter wave focusing or interference superposition effect to achieve higher radiation gain, such as the application of lens antenna: increasing the medium lens or conductor lens in front of the antenna unit to focus and achieve higher radiation gain.

[0086] (3) using the passing or blocking effect of the conductor piece 33 on the antenna unit at a specific frequency to use the periodic structure superposition effect to realize the adjustment effect on the radiation channel: such as frequency selective surface, increasing the medium cover or metal cover around the antenna unit 13, through certain design, the antenna cover can realize the frequency selection effect, the electromagnetic wave of the working frequency band is not affected, and the electromagnetic wave of the non-working frequency band is shielded.

[0087] Referring toFigure 1 and Figure 7 When the antenna device 10 is adjusted by the dielectric member 31, a plastic dielectric member 31 is additionally arranged above the antenna unit 13 of the signal module 1 and below the shell 50 for adjustment. After the antenna unit 13 of the signal module 1 is excited to perform primary radiation, a new radiation pattern is formed after the interference of the dielectric member 31, and the influence of the non-standard shell 50 on the millimeter wave module radiation pattern is reduced. For further reference Figure 7 After the adjustment by the additional dielectric member 31, the following optimization effects are brought: the isolation between the transmitting array 16 and the receiving array 17 of the signal module 1 is improved from 21.7 dB to 32.4 dB, and the receiver noise floor is reduced; the gain of the direction angle in the application requirement of -45°~+45° is improved: 0° is improved by 2.9 dB, and ±45° is improved by about 1 dB.

[0088] For reference Figure 8 and Figure 14 When the antenna device 10 is adjusted by the conductor member 33, a conductor member 33 is additionally arranged above the antenna unit 13 of the signal module 1 and below the shell 50 for adjustment, and the conductor member 33 is realized by using a flexible circuit board carrier and is pasted on the shell 50. After the antenna unit 13 of the signal module 1 is excited to perform primary radiation, the radiation pattern changes after the conductor adjustment assembly 3, and a new radiation pattern is formed. Without changing the horizontal gain, a side lobe is generated in the -Z direction, so that the signal module 1 meets the requirements of long-distance detection in the front horizontal ±45°, and also meets the requirement of detecting objects below when the product is hung at a height of 2 m. It is worth noting that if the conductor member 33 is not added, the bottom detection requirement of the millimeter wave radar 100 cannot be met. For further reference Figure 14 After the conductor member 33 is added, the following optimization effects are brought: under the condition of ensuring the horizontal front ±45° coverage range performance, a lobe is newly added in the direction of about 180° in the elevation angle, and the antenna gain is improved from -18dBi to about -2dBi, so that the signal module 1 meets the requirement of bottom object detection, and the application effect of the signal module 1 is optimized.

[0089] Therefore, the antenna device 10 and the millimeter wave radar 100 of the embodiment of the application have the following advantages: by additionally arranging the adjustment assembly 3 between the signal module 1 and the shell 50, the adjustment assembly 3 can include the insulating dielectric member 31 or the conductor member 33, the adjustment effect of the adjustment assembly 3 is superimposed, the influence of the shell 60 on the propagation of the millimeter wave signal is greatly reduced, the limitation on the appearance design of the product is reduced, and the gain and the anti-interference capability of the millimeter wave radar 100 are improved.

[0090] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, within the technical concept of the present application, and based on the content of the present application and the accompanying drawings, are included in the patent protection scope of the present application.

Claims

1. An antenna device, characterized by The antenna device is applied to a millimeter wave radar, the millimeter wave radar comprises a shell, and the antenna device comprises: a signal module, which is arranged in the shell and comprises an antenna unit for transmitting or receiving millimeter wave signals towards the outside of the shell to form a radiation field inside the shell; and an adjusting assembly arranged between the shell and the signal module, which has a spatial impedance value different from that of air for guiding the propagation of the millimeter wave signals to adjust the radiation characteristics of the radiation field in each direction; the adjusting assembly comprises a dielectric piece having a dielectric constant value higher than that of air for the millimeter wave signals to penetrate, reflect or diffract; the dielectric piece comprises a circular arc body, the concave side of the circular arc body is arranged towards the shell; the dielectric piece further comprises a strip-shaped body extending along the horizontal direction and arranged on the concave side of the circular arc body; and a side of the dielectric piece towards the signal module is provided with a plurality of support bodies, and the plurality of support bodies are respectively connected to the peripheral side of the signal module.

2. A millimeter wave radar, characterized by, The millimeter wave radar comprises: a shell; the antenna device according to claim 1, the signal module is arranged in the shell; and a control module electrically connected with the signal module to control the radio frequency signals of the signal module.

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