Antenna device and millimeter wave radar

Abstract

The invention discloses an antenna device and a millimeter wave radar, and relates to the technical field of antennae, 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 used for being arranged in the shell, and the adjusting assembly is used for adjusting the signal module. The millimeter wave antenna is arranged in the shell and transmits or receives millimeter wave signals towards the outer side of the shell so as to form a radiation field in the shell. And the adjusting assembly is arranged between the shell and the signal module, has a spatial impedance value different from that of air, and is used for guiding propagation of the millimeter wave signals so as to adjust radiation characteristics of the radiation field in all directions. According to the scheme, the design limitation on the shape and the thickness of the shell can be reduced, and the detection performance of the millimeter wave radar can be further optimized.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an antenna device and a millimeter wave radar. Background Art

[0002] Millimeter wave radar is a device that uses millimeter waves to send and receive signals. For example, after the radar transmits millimeter waves, it receives reflected signals from the target and determines the target's position, speed and other information by analyzing these signals. Therefore, it can be applied to fields such as vehicle-mounted radar.

[0003] In the related art, the millimeter wave radar includes a shell and a signal module. The signal module is arranged on the inner side of the shell and is used to transmit or receive millimeter wave signals toward the outer side of the shell to form a radiation field. However, since the millimeter wave signal is approximately uniformly radiated in all directions in the air, in order to avoid phase distortion of the millimeter wave propagation between the signal module and the shell, it is necessary to keep the distance value between the signal module and all positions on the inner wall of the shell as much as possible at 0.5n times the millimeter wave wavelength. In addition, in order to avoid the interference between the reflected wave and the transmitted wave when the millimeter wave passes through the shell and cause energy loss, it is also necessary to keep the shell thickness as much as possible at 0.5n times the equivalent medium wavelength. In view of this, the design shape and thickness of the shell have high requirements, which is not conducive to ensuring the detection performance of the millimeter wave radar. Summary of the invention

[0004] The main purpose of the present invention is to provide an antenna device and a millimeter-wave radar, aiming to reduce the design restrictions on the shape and thickness of the shell, while being conducive to optimizing the detection performance of the millimeter-wave radar.

[0005] To achieve the above-mentioned purpose, the antenna device proposed in the present invention is applied to a millimeter wave radar, and the millimeter wave radar includes a shell, and the antenna device includes a signal module and an adjustment component. The signal module is used to be arranged in the shell, and the signal module includes an antenna unit. The antenna unit is used to transmit or receive millimeter wave signals toward the outside of the shell to form a radiation field inside the shell; the adjustment component is arranged between the shell and the signal module, and the adjustment component has a spatial impedance value different from that of air, and is used to guide the propagation of the millimeter wave signal to adjust the radiation characteristics of the radiation field in various directions.

[0006] In one embodiment, the adjustment component includes a dielectric member having a dielectric constant value higher than that of air, so as to allow the millimeter wave signal to penetrate, reflect or diffract.

[0007] In one embodiment, the dielectric member includes an arc body, and a concave side of the arc body is arranged toward the shell.

[0008] In one embodiment, the dielectric member further comprises a strip body extending in a horizontal direction and arranged on the concave side of the arc body. And / or, the dielectric member is provided with a plurality of supporting bodies protruding from one side of the dielectric member facing the signal module, and the plurality of supporting bodies are respectively connected to the peripheral side of the signal module.

[0009] In one embodiment, a plurality of step portions are protruded from one side of the dielectric member facing the housing, and the plurality of step portions are arranged perpendicular to the dielectric member and spaced apart in a horizontal direction.

[0010] In one embodiment, the dielectric member includes two spaced apart support portions and a connecting portion connecting the two support portions, the two support portions are respectively connected to the peripheral sides of the signal module, and a groove is formed on one side of the connecting portion facing the signal module.

[0011] In one embodiment, the adjustment component includes a conductor, and a gap is provided through the conductor along the thickness direction for allowing the millimeter wave signals to interfere and superimpose.

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

[0013] In one embodiment, the conductor member includes a plurality of sub-conductors, the plurality of sub-conductors are evenly spaced and arranged in a horizontal direction, and two adjacent sub-conductors enclose each other to form the gap.

[0014] In one embodiment, the conductor member is integrally penetrated by a plurality of slots arranged in an array.

[0015] In one embodiment, the distance between the conductor and the antenna unit of the signal module is 0.4n to 0.6n times the wavelength of the millimeter wave signal, where n is a positive integer.

[0016] In one embodiment, the adjustment component further includes a flexible circuit board, one side of the flexible circuit board is bonded to the inner wall of the shell, and the other side of the flexible circuit board facing the signal module is used to be attached to the conductor.

[0017] The present invention also proposes a millimeter wave radar, which includes a shell, a control module and the antenna device as described above, wherein 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, including 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. Due to the spatial impedance inconsistent with the air, for example, the millimeter wave signal can be beam converged, tilted and diverged, thereby playing a role in adjusting the radiation characteristics of the radiation field in all directions, which 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 also avoiding 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, so that the appearance of the shell is aesthetically pleasing, and at the same time it is conducive to ensuring 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of a millimeter wave radar provided by the present invention; Figure 2 for Figure 1 The structural diagram of the signal module; Figure 3 for Figure 1 The middle adjustment component includes a schematic structural diagram of an embodiment of a dielectric member; Figure 4 for Figure 1 A schematic structural diagram of another embodiment of the middle adjustment component including a dielectric member; Figure 5 for Figure 1 A schematic structural diagram of another embodiment of the middle adjustment component including a dielectric member; Figure 6 for Figure 1 A schematic structural diagram of another embodiment of the middle adjustment component including a dielectric member; Figure 7 for Figure 1 Radiation pattern of a millimeter wave radar embodiment; Figure 8 A schematic structural diagram of another embodiment of a millimeter wave radar provided by the present invention; Fig. 9 for Figure 8 The middle adjustment assembly includes a schematic structural diagram of an embodiment of a conductor member; Fig.10 for Figure 8 A schematic structural diagram of another embodiment in which the middle adjustment component includes a conductor; Fig.11 for Figure 8 A schematic structural diagram of another embodiment in which the middle adjustment component includes a conductor; Fig.12 for Figure 8 A schematic structural diagram of another embodiment of the middle adjustment component including a conductor member; Fig.13 for Figure 8 Structural schematic diagrams of various implementations when the conductor is in a non-strip shape; Fig.14 for Figure 8 Radiation pattern of an embodiment of a millimeter wave radar.

[0021] Explanation of the accompanying drawings: 100, millimeter wave radar; 10, antenna device; 1, signal module; 11, dielectric substrate; 13, antenna unit; 131, slot; 15, feeding network; 16, transmitting array; 17, receiving array; 18, ground plane; 3, adjustment component; 31, dielectric member; 311, arc body; 313, strip body; 315, supporting body; 317, stepped portion; 3171, sub-step; 3181, supporting portion; 3183, connecting portion; 3185, groove; 33, conductor member; 331, sub-conductor; 333, gap; 50, shell; 60, control module.

[0022] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] Millimeter wave radar is a device that uses millimeter waves to send and receive signals. For example, after the radar transmits millimeter waves, it receives reflected signals from the target and determines the target's position, speed and other information by analyzing these signals. Therefore, it can be applied to fields such as vehicle-mounted radar.

[0027] Millimeter-wave radar products currently used in the Internet of Things, including 24G radars and 60G radars, usually use millimeter-wave modules with integrated antennas. When this module is applied to the product, the product structure is greatly affected, especially the plastic shell, which needs to strictly meet the design specifications to avoid serious performance degradation. The shell thickness must be equal to 0.5n times the equivalent wavelength, and the distance between the shell and the antenna unit must be equal to 0.5n times the free space wavelength. This is inconsistent with the product's appearance design.

[0028] For example, in the related art, the millimeter wave radar includes a shell and a signal module. The signal module is arranged on the inner side of the shell and is used to transmit or receive millimeter wave signals toward the outer side of the shell to form a radiation field. However, since the millimeter wave signal is approximately uniformly radiated in all directions in the air, in order to avoid phase distortion of the millimeter wave propagation between the signal module and the shell, it is necessary to keep the distance value between the signal module and all positions on the inner wall of the shell as much as possible to 0.5n times the millimeter wave wavelength. In addition, in order to avoid the interference between the reflected wave and the transmitted wave when the millimeter wave passes through the shell and cause energy loss, it is also necessary to keep the shell thickness as much as possible to 0.5n times the equivalent medium wavelength. In view of this, the design shape and thickness of the shell have high requirements, which is not conducive to ensuring the detection performance of the millimeter wave radar.

[0029] In order to solve the above problems, the present invention proposes an antenna device 10, which 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.

[0030] Reference Figures 1 to 14 In one embodiment of the present invention, the antenna device 10 is applied to a millimeter wave radar 100, and the millimeter wave radar 100 includes a shell 50. The antenna device 10 includes a signal module 1 and an adjustment component 3. The signal module 1 is used to be arranged in the shell 50, and transmit or receive millimeter wave signals toward the outside of the shell 50 to form a radiation field inside the shell 50; the adjustment component 3 is arranged between the shell 50 and the signal module 1, and the adjustment component 3 has a spatial impedance value different from that of air, and is used to guide the propagation of the millimeter wave signal to adjust the radiation characteristics of the radiation field in various directions.

[0031] The antenna device 10 of the present application is not only applicable to the millimeter wave radar 100, but also applicable to other electronic devices. The antenna device 10 of the present application is not only applicable to millimeter wave electromagnetic signals, but also applicable to other high-frequency electromagnetic signals. The housing 50 can be made of plastic or metal and can be of any shape.

[0032] The signal module 1, i.e., the millimeter wave module, can be a PCBA module or an integrated semiconductor chip, for example, Figure 2 The signal module 1 may include a dielectric substrate 11, an antenna unit 13, a feed network 15 and a ground plane 18. Figure 2 The 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 unit 13 is provided with a slot 131 for impedance matching, which is beneficial to 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 unit is designed on the control module or anywhere else, and the chip is connected to the antenna unit by means of a microstrip line, a coaxial line, etc. In the third embodiment of the signal module, in the third embodiment of the signal module, the radio frequency circuit is designed on the control module and integrated with the driving circuit, which is responsible for processing the radio frequency signal 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 integrated into the chip. Therefore, the antenna device 10 is suitable for various types of signal modules 1, which is beneficial to further meet the user's usage needs.

[0033] The spatial impedance value of the adjustment component 3 is different from that of air, which can change the radiation characteristics of the radiation field, including directivity, intensity and distribution, and help improve the detection accuracy and coverage of the radar system. By introducing materials with variable dielectric constants or magnetic permeabilities, dynamic adjustment of the spatial impedance value can be achieved to adapt to different working conditions and application scenarios. The distance between the adjustment component 3 and the housing 50 can be arbitrary.

[0034] In the technical solution of the present invention, the antenna device 10 is applied to the millimeter wave radar 100, and includes two parts: a signal module 1 and an adjustment component 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 adjustment component 3 is arranged between the shell 50 and the signal module 1. Due to the spatial impedance inconsistent with the air, for example, the millimeter wave signal can be beam converged, tilted and diverged, thereby playing a role in adjusting the radiation characteristics of the radiation field in all directions, which is conducive to avoiding the need for the distance value between the signal module 1 and all positions on the inner wall of the shell 50 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 50 can be reduced, so that the appearance of the shell 50 is beautiful, and at the same time it is conducive to ensuring the detection performance of the millimeter wave radar 100.

[0035] Reference Figures 1 to 14 In one embodiment of the present invention, the adjustment component 3 includes a dielectric member 31, and the dielectric member 31 has a dielectric constant value higher than that of air, so as to allow the millimeter wave signal to penetrate, reflect or diffract.

[0036] The dielectric member 31 may be of any shape and may be made of insulating materials such as plastic. Figures 2 to 6 The dielectric member 31 as a whole can be in an arc shape, a step shape, a strip shape or a combination shape, etc. The adjustment assembly 3 can also include other components for assisting the installation of the dielectric member 31 , such as a snap-fit ​​component, etc., to facilitate the installation and removal of the dielectric member 31 .

[0037] In this embodiment, the dielectric member 31 replaces the air around the signal module 1. Since the dielectric member 31 has a higher dielectric constant than air, it can affect the phase change of the millimeter wave signal when passing through the housing 50, optimize the radiation pattern of the radiation field of the signal module 1, and improve the gain of the radiation field of the signal module 1 in a specific direction. At the same time, the dielectric member 31 can prevent the housing 50 from 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.

[0038] Optionally, a periodic structure such as a strip unit or a slot unit is designed in the dielectric element 31 to further optimize the phase adjustment and achieve more precise radiation field control. Using a multi-layer dielectric element 31 can provide more phase adjustment options, thereby optimizing the radiation characteristics.

[0039] Reference Figure 1 and Figure 3 In one embodiment of the present invention, the dielectric member 31 includes an arc body 311 , and the concave side of the arc body 311 is arranged toward the housing 50 .

[0040] In this embodiment, the design of the arc body 311 helps to concentrate the signal so that it propagates in a predetermined direction, thereby improving the main lobe gain of the millimeter wave radar 100. The concave side facing the housing 50 can better control the reflection and diffraction behavior of the signal, reduce unnecessary scattering, and thus improve the clarity of the signal. This geometric shape helps to reduce the overall volume of the antenna while maintaining good performance.

[0041] Reference Figure 1 and Figure 4 In one embodiment of the present invention, the dielectric member 31 further comprises a strip 313, which extends in the horizontal direction and is disposed on the concave side of the arc body 311. And / or, the dielectric member 31 is provided with a plurality of supporting bodies 315 protruding from one side of the dielectric member 31 facing the signal module 1, and the plurality of supporting bodies 315 are respectively connected to the peripheral side of the signal module 1.

[0042] In this embodiment, a strip body 313 is added to the concave side of the 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 dielectric component 31, the spatial 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.

[0043] Optionally, the strips 313 of different widths and lengths are designed to optimize the propagation path of the millimeter wave. The strips 313 can also be designed in a certain arrangement, such as an array arrangement, to achieve more precise phase adjustment.

[0044] Optionally, multiple support bodies 315 are further added on the basis of the arc body 311 and the strip body 313. The design of the support body 315 can provide support and positioning for the arc body 311 and the strip body 313, ensuring the propagation of the millimeter wave signal of the signal module 1 toward the dielectric component 31 and reducing the performance degradation caused by mechanical vibration or temperature change.

[0045] Reference Figures 1 to 6 In one embodiment of the present invention, a plurality of stepped portions 317 are protruded from one side of the dielectric member 31 facing the housing 50 , and the plurality of stepped portions 317 are arranged perpendicular to the dielectric member 31 and spaced apart in a horizontal direction.

[0046] In this embodiment, the design of the step portion 317 can achieve multi-level reflection or diffraction of the millimeter wave signal, which helps to control the diffusion angle of the signal and improve the angular resolution capability of the millimeter wave radar 100. At the same time, the design of the step portion 317 can make the dielectric constant between the dielectric member 31 and the air change more smoothly, and can improve the impedance matching between the dielectric member 31 and the housing 50, reducing the energy loss caused by mismatch.

[0047] Optionally, each step portion may further include a plurality of sub-steps 3171 with different protruding lengths to further adjust the propagation of the millimeter wave signal.

[0048] Reference Figure 5 In one embodiment of the present invention, the dielectric member 31 includes two support portions 3181 spaced apart, a connecting portion 3183 connecting the two support portions 3181, the two support portions 3181 are respectively connected to the peripheral sides of the signal module 1, and a groove 3185 is formed on one side of the connecting portion 3183 facing the signal module 1.

[0049] The connection portion 3183 is generally in the shape of a strip.

[0050] In this embodiment, the presence of the groove 3185 can further control the reflection propagation path of the millimeter wave signal, help 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 specific direction. The design of the two supporting portions 3181 can provide better support stability, ensure the contact between the dielectric component 31 and the signal module 1, and reduce the performance degradation caused by mechanical vibration or temperature change.

[0051] Reference Figure 8 In one embodiment of the present invention, the adjustment component 3 includes a conductor 33, and a gap 333 is provided through the conductor 33 along the thickness direction for allowing the millimeter wave signal to interfere and superimpose.

[0052] The conductor 33 may be designed in any shape, with different gap 333 spacings or strip sizes, thicknesses, etc. Strip units or gap units may be used, with a certain periodic repetitive structure, to achieve a better adjustment effect.

[0053] In this embodiment, the phase modulation of the millimeter wave signal can be achieved by controlling the position and size of the slot 333, thereby controlling the propagation direction of the millimeter wave signal. Through the interference superposition of the slot 333, a specific beam shape can be generated, which helps to improve the detection accuracy and coverage of the millimeter wave radar 100.

[0054] Reference Figures 9 to 13 In one embodiment of the present invention, the conductor member 33 is a symmetrical structure.

[0055] The conductor 33 may be an axisymmetric or centrosymmetric structure. Figures 9 to 11 , the conductor 33 may be Fig. 9 Regular strips can also be Fig.10 Irregular strips can also be Fig.11A strip block with a certain thickness, then, refer to Fig.12 The shape of the conductor member 33 can also be various deformations based on the strip and gap units.

[0056] In this embodiment, the symmetrical structure helps to simplify the design and manufacturing process of the conductor 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 the millimeter wave radar 100 that requires all-round coverage.

[0057] Reference Figures 9 to 11 In one embodiment of the present invention, the conductor member 33 includes a plurality of sub-conductors 331 , and the plurality of sub-conductors 331 are evenly spaced and arranged in a horizontal direction, and two adjacent sub-conductors 331 enclose each other to form the gap 333 .

[0058] The sub-conductor 331 may be implemented using copper foil and disposed on a flexible circuit board or a printed circuit board, which facilitates the integration of the conductor 33 to reduce the volume of the millimeter wave radar 100. The sub-conductor 331 may be in a strip shape.

[0059] In this embodiment, the arrangement of the sub-conductors 331 can achieve precise control of the signal phase, help generate the desired beam shape, and improve the detection accuracy of the millimeter wave radar 100. The multiple array-arranged slots 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 multipath propagation of signals, help improve the angular resolution and coverage of the millimeter wave radar 100, and increase the lobe gain of the radiation field of the millimeter wave radar 100.

[0060] Reference Fig.12 In one embodiment of the present invention, the conductor member 33 is integrally penetrated by a plurality of slots 333 arranged in an array.

[0061] In this embodiment, the design of array-arranged slots 333 in the same conductor 33 can simplify the design and manufacturing process of the antenna, especially for application scenarios that require high-density slots 333 to be arranged, so as to further meet the needs of production use.

[0062] Reference Figure 8 In one embodiment of the present invention, the distance value from the conductor 33 to the antenna unit 13 of the signal module 1 is 0.4n to 0.6n times the wavelength value of the millimeter wave signal, where n is a positive integer.

[0063] In this embodiment, the distance between the conductor 33 and the signal module 1 is set to an integer multiple of the wavelength of the millimeter wave signal, such as within the range of 0.4n to 0.6n times, 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 changes in spatial impedance during transmission, reducing the phase distortion and loss of the millimeter wave signal.

[0064] Reference Figure 8 In one embodiment of the present invention, the adjustment component 3 further includes a flexible circuit board, one side of which is bonded to the inner wall of the housing 50 , and the other side of which faces the signal module 1 and is used to be attached to the conductor 33 .

[0065] In this embodiment, the flexible circuit board can adapt to different housing shapes and sizes due to its flexibility, thereby making it easier to install and maintain the conductor 33. It can not only provide a stable physical connection, but also simplify the process of electrical connection, thereby reducing assembly time and cost.

[0066] Optionally, the conductor 33 is connected to the circuit board by bonding or by means of adhesion.

[0067] The present invention also proposes a millimeter wave radar 100, which includes a shell 50, a control module 60 and the antenna device 10 as described above, wherein the signal module 1 is arranged in the shell 50; the control module 60 and the signal module 1 are electrically connected to control the radio frequency signal of the signal module 1.

[0068] The specific structure of the antenna device 10 refers to the above embodiments. Since the millimeter wave radar 100 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0069] The control module 60 includes a controller and a main control circuit board. The controller is disposed on the main control circuit board and is used to be electrically connected to the radio frequency circuit of the signal module 1 , thereby controlling the radio frequency signal of the signal module 1 .

[0070] In summary, the specific working principle of the antenna device 10 and the millimeter wave radar 100 of the embodiment of the present invention can be referred to as follows: when the signal module 1 is transmitting or receiving, when an antenna unit 13 of the signal module 1 is excited, it will radiate to the surroundings, and the filling material in the surrounding space will in turn affect and change the primary radiation field of the antenna to form the final antenna radiation field; usually, the filling material in the space around the antenna is designed and arranged to a certain extent, and the primary radiation field can be optimized, including changing the directional gain and lobe angle, reducing interference, and reducing the influence of the rear filling material, etc., for the following reasons: (1) Changing the spatial impedance around the antenna unit 13: After adding a dielectric or metal conductor around the antenna unit 13, the space that was originally air in the space is replaced by a dielectric and a conductor. The dielectric and the conductor have different electrical parameters from the air, such as dielectric constant, dielectric loss factor, conductivity, etc., which changes the spatial impedance around the antenna unit 13, thereby changing the radiation characteristics of the antenna unit 13 of the signal module 1.

[0071] (2) Utilize the delay or acceleration differences of millimeter-wave signals in different directions to form a millimeter-wave focusing or interference superposition effect to achieve higher radiation gain, such as the application of lens antennas: adding a dielectric lens or a conductor lens in front of the antenna unit to focus and achieve higher radiation gain.

[0072] (3) By utilizing the passing or blocking effect of the conductor 33 on the specific frequency of the antenna unit, the periodic structure superposition effect is used to achieve the regulation of the radiation channel: such as the frequency selective surface, adding a dielectric cover or a metal cover to the periphery of the antenna unit 13. The antenna cover can achieve the effect of frequency selection through a certain design, and has no effect on the electromagnetic waves in the working frequency band, while the battery waves in the non-working frequency band will be shielded.

[0073] Reference Figure 1 and Figure 7 When the antenna device 10 is adjusted by the dielectric member 31, a plastic dielectric member 31 is added above the antenna unit 13 of the signal module 1 and below the housing 50 for adjustment; the antenna unit 13 of the signal module 1 performs primary radiation after being excited, and forms a new radiation pattern after being interfered by the dielectric member 31, thereby reducing the influence of the non-standard housing 50 on the radiation pattern of the millimeter wave module. Figure 7 After adding the dielectric component 31, the optimization effects are as follows: the isolation between the transmitting array 16 and the receiving array 17 of the signal module 1 is improved from 21.7dB to 32.4dB, and the receiver noise floor is reduced; the gain of the directional angle required by the application of -45°~+45° is improved: 0° is increased by 2.9dB, and ±45° is increased by about 1dB.

[0074] Reference Figure 8 and Fig.14 When the antenna device 10 is adjusted using a conductor 33, an additional conductor 33 is provided above the antenna unit 13 of the signal module 1 and below the shell 50 for adjustment. The conductor 33 is implemented using a flexible circuit board carrier and is attached to the shell 50. The antenna unit 13 of the signal module 1 performs primary radiation after being excited. After passing through the conductor adjustment component 3, the radiation pattern changes to form a new radiation pattern. This pattern generates a side lobe in the -Z direction without changing the horizontal gain, so that the signal module 1 can meet the long-distance detection requirements of ±45° horizontally in front, and at the same time, it can also detect objects below when the product is hung at a height of 2m. It is worth noting that without adding the conductor 33, the downward detection requirements of the millimeter-wave radar 100 cannot be met. For further reference Fig.14 After adding 33 conductor parts, the optimization effects are as follows: while ensuring the horizontal front ±45° coverage performance, a new lobe is added in the direction of the pitch angle of 180 degrees, and the antenna gain is increased from -18dBi to about -2dBi, so that the signal module 1 goes from not meeting the requirements of bottom object detection to meeting them, optimizing the application effect of the signal module 1.

[0075] Therefore, the antenna device 10 and the millimeter-wave radar 100 of the embodiment of the present invention, by adding an adjustment component 3 between the signal module 1 and the shell 50, the adjustment component 3 may include an insulating dielectric component 31 or a conductor component 33. By superimposing the adjustment effect of the adjustment component 3, the influence of the shell 60 on the propagation of the millimeter-wave signal is greatly reduced, and the restrictions on the appearance design of the product are reduced. At the same time, the gain and anti-interference capability of the millimeter-wave radar 100 can also be improved through the adjustment component 3.

[0076] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An antenna device, characterized in that: The antenna device is applied to a millimeter wave radar, the millimeter wave radar comprises a housing, and the antenna device comprises: a signal module, the signal module being configured to be disposed in the housing, the signal module comprising an antenna unit, the antenna unit being configured to transmit or receive a millimeter wave signal toward an outside of the housing to form a radiation field inside the housing; and An adjustment component is disposed between the shell and the signal module, and has a spatial impedance value different from that of air, and is used to guide the propagation of the millimeter wave signal to adjust the radiation characteristics of the radiation field in various directions.

2. The antenna device according to claim 1, characterized in that The adjustment component includes a dielectric member having a dielectric constant value higher than that of air so as to allow the millimeter wave signal to penetrate, reflect or diffract.

3. The antenna device according to claim 2, characterized in that The dielectric member comprises an arc body, and a concave side of the arc body is arranged toward the shell.

4. The antenna device according to claim 3, characterized in that The dielectric member further comprises a strip-shaped body, which extends in a horizontal direction and is arranged on a concave side of the arc body; And / or, a plurality of supporting bodies are protruded from one side of the dielectric member facing the signal module, and the plurality of supporting bodies are respectively connected to the peripheral side of the signal module.

5. The antenna device according to claim 2, characterized in that: A plurality of stepped portions are protruded from one side of the dielectric member toward the housing, and the plurality of stepped portions are arranged perpendicular to the dielectric member and spaced apart in a horizontal direction; Alternatively, the dielectric member includes two support portions that are spaced apart, and a connecting portion that connects the two support portions, the two support portions are respectively connected to the peripheral sides of the signal module, and a groove is formed on one side of the connecting portion that faces the signal module.

6. The antenna device according to claim 1, wherein: The adjustment component includes a conductor, and a gap is provided through the conductor along the thickness direction for allowing the millimeter wave signals to interfere and superimpose.

7. The antenna device according to claim 6, characterized in that The conductor member has a symmetrical structure.

8. The antenna device according to claim 7, characterized in that The conductor member comprises a plurality of sub-conductors, the plurality of sub-conductors are evenly spaced and arranged in a horizontal direction, and two adjacent sub-conductors enclose each other to form the gap; Alternatively, the conductor member is entirely penetrated by a plurality of slots arranged in an array.

9. The antenna device according to claim 6, characterized in that: The distance between the conductor and the antenna unit of the signal module is 0.4n to 0.6n times the wavelength of the millimeter wave signal, where n is a positive integer; And / or, the adjustment component further includes a flexible circuit board, one side of the flexible circuit board is bonded to the inner wall of the shell, and the other side of the flexible circuit board facing the signal module is used to be attached to the conductor.

10. A millimeter wave radar, characterized in that: The millimeter wave radar comprises: case; The antenna device according to any one of claims 1 to 9, wherein the signal module is disposed in the housing; and A control module is electrically connected to the signal module to control the radio frequency signal of the signal module.

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