CN214378855U

CN214378855U - Millimeter wave radar antenna and electronic device

Info

Publication number: CN214378855U
Application number: CN202120661392.1U
Authority: CN
Inventors: 丁航; 付荣
Original assignee: Lanto Electronic Ltd
Current assignee: Lanto Electronic Ltd; Kunshan Liantao Electronics Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-10-08
Anticipated expiration: 2031-03-31

Abstract

The application discloses millimeter wave radar antenna and electron device. The millimeter wave radar antenna includes: the device comprises a metal bottom plate provided with a hole, a first dielectric plate provided with a feed through hole, a second dielectric plate, a cover plate, a super-surface structure, a driving patch and a feed probe. The first dielectric plate is arranged on the metal bottom plate, and the feed through hole corresponds to the hole; the second dielectric plate is arranged on the first dielectric plate; the cover plate is arranged on the second medium plate; the super-surface structure is arranged on the surface of the second dielectric plate facing the cover plate and comprises a plurality of super-surface patches which are spaced from each other; the driving patch is arranged on the surface of the first dielectric slab facing the second dielectric slab and corresponds to the central position where the plurality of super-surface patches are arranged; the feed probe penetrates through the metal bottom plate and the first dielectric plate through the feed through hole and the hole corresponding to the feed through hole, one end of the feed probe is connected with the drive patch and used for feeding the drive patch, the drive patch generates a first resonance, and the super-surface structure generates a second resonance through the drive patch.

Description

Millimeter wave radar antenna and electronic device

Technical Field

The present application relates to the field of antenna technology, and in particular, to a millimeter wave radar antenna and an electronic device.

Background

The radar identification module applied to the electronic device has the characteristic of high integration, and external structures such as a shell, a rear cover, a metal frame and a display screen of the electronic device need to be considered when a millimeter wave radar antenna in the radar identification module is designed, so that the radar identification module has the difficulty of realizing normal work.

The current solution is to use the technology of Antenna-in-Package (AiP) with low integration level, so that there is a certain gap between the glass lens and the Antenna, so that the Antenna is not in contact with the housing and the screen of the electronic device, and good impedance matching and radiation pattern can be realized only by fine-tuning the structure of the Antenna. However, the antenna using the above design with a gap generally adopts a typical antenna such as a patch or a planar dipole, and has the problems that the bandwidth of the antenna is narrow, and the improvement of the antenna performance by the optimized structure is limited. In addition, a certain gap is left between the glass lens and the antenna, so that when the electronic device faces external force (such as hand holding and squeezing), the internal structure of the antenna may be changed, the electrical performance is adversely affected, and the reliability and accuracy of target recognition during normal operation of a radar recognition module applying the antenna are reduced.

In view of the above, AiP technology has been proposed to design an antenna to be closely attached to an external component, so that the antenna is fixed to a housing and a frame of an electronic device, but there are some challenges in terms of EMI and EMC caused by the limitation of physical space, which may cause serious problems such as impedance mismatch and pattern distortion of the antenna.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a millimeter wave radar antenna and an electronic device, and can effectively solve the serious problems that when the current AiP technology is applied to an antenna, the antenna has impedance mismatch, directional diagram distortion and the like caused by the limitation of physical space.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, a millimeter wave radar antenna is provided, which includes: the device comprises a metal bottom plate provided with a hole, a first dielectric plate arranged on the metal bottom plate and provided with a feed through hole, a second dielectric plate arranged on the first dielectric plate, a cover plate arranged on the second dielectric plate, a super-surface structure, a driving patch and a feed probe, wherein the feed through hole corresponds to the hole; the super-surface structure is arranged on the surface of the second dielectric plate facing the cover plate and comprises a plurality of super-surface patches which are spaced from each other; the driving patch is arranged on the surface of the first dielectric slab facing the second dielectric slab and corresponds to the central position where the plurality of super-surface patches are arranged; and the feed probe penetrates through the metal bottom plate and the first dielectric plate through the feed through hole and the hole corresponding to the feed through hole, one end of the feed probe is connected with the drive patch and used for feeding the drive patch, so that the drive patch generates a first resonance, and the super-surface structure generates a second resonance through the drive patch.

In one embodiment, the driver patch includes a patch body and matching branches; the matching branch is connected with the feed probe and used for realizing impedance matching of the millimeter wave radar antenna.

In one embodiment, the matching limbs and/or patch body are rectangular in shape.

In an embodiment, the millimeter wave radar antenna further includes a first adhesive layer and a second adhesive layer, the first dielectric plate is bonded to the second dielectric plate through the first adhesive layer, and the second dielectric plate is bonded to the cover plate through the second adhesive layer.

In one embodiment, the first dielectric plate and the second dielectric plate are made of liquid crystal polymer.

In an embodiment, the plurality of super-surface patches are arranged in a rectangular matrix.

In an embodiment, the millimeter wave radar antenna further includes a coaxial connector disposed on the surface of the metal bottom plate away from the first dielectric plate and connected to the other end of the feed probe.

In one embodiment, the number of the driving patches is even, every two symmetrically arranged driving patches form an active unit, and the plurality of super-surface patches are uniformly arranged corresponding to the even driving patches; the number of the feed probes, the number of the feed through holes and the number of the holes are the same as the number of the drive patches, the feed probes correspondingly penetrate through the feed through holes and the holes one to one and are correspondingly connected with the drive patches, and the two drive patches in one active unit carry out differential feed through the correspondingly connected feed probes so as to provide beam scanning.

In one embodiment, each driver patch includes matching branches; the matching branches of the feed probes respectively connected to the two driving patches in one active unit are arranged at 180 degrees.

In a second aspect, an electronic device is provided that includes a millimeter wave radar antenna of an embodiment of the present application.

In the embodiment of the application, a super-surface structure with a Reactive Impedance Surface (RIS) is introduced into the millimeter wave radar antenna through a super-surface loading technology, so that when the millimeter wave radar antenna works, a feed probe feeds power to the driving patch to excite the driving patch to generate a first resonance, and the super-surface structure generates a second resonance through tight coupling with the driving patch, so that the first resonance generated by the driving patch and the second resonance generated by the super-surface structure act together, and the serious problems of Impedance mismatch, directional diagram distortion and the like of the antenna caused by the limitation of physical space in the conventional AiP technology are solved. In addition, the millimeter wave radar antenna is designed by seamlessly stacking and combining multiple layers of materials, so that the millimeter wave radar antenna has good sealing performance and stability, and the normal operation of a radar identification module and an electronic device applying the millimeter wave radar antenna on the identification function is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is an exploded view of one embodiment of a millimeter-wave radar antenna according to the present application;

FIG. 2 is a combination diagram of one embodiment of the millimeter-wave radar antenna of FIG. 1;

FIG. 3 is a cross-sectional view of one embodiment of the millimeter-wave radar antenna of FIG. 1;

FIG. 4 is a graph illustrating return loss simulation for one embodiment of the millimeter-wave radar antenna of FIG. 1;

FIG. 5 is a graph illustrating simulated radiation gain for one embodiment of the millimeter-wave radar antenna of FIG. 1;

FIG. 6 is a simulated radiation pattern for one embodiment of the millimeter-wave radar antenna of FIG. 1;

FIG. 7 is an exploded view of another embodiment of a millimeter wave radar antenna according to the present application;

FIG. 8 is a cross-sectional view of one embodiment of the millimeter-wave radar antenna of FIG. 7;

FIG. 9 is a graph illustrating return loss simulation for one embodiment of the millimeter-wave radar antenna of FIG. 7;

FIG. 10 is a simulated graph of isolation for one embodiment of the millimeter-wave radar antenna of FIG. 7;

FIG. 11 is a graph illustrating simulated radiation gain for one embodiment of the millimeter-wave radar antenna of FIG. 7;

FIG. 12 is a simulated radiation pattern for one embodiment of an active element of the millimeter-wave radar antenna of FIG. 7;

FIG. 13 is a simulated radiation pattern for one embodiment of another active element of the millimeter wave radar antenna of FIG. 7;

FIG. 14 is a block diagram of one embodiment of an electronic device having a millimeter wave radar antenna of the present application; and

fig. 15 is a block diagram of another embodiment of an electronic device having a millimeter wave radar antenna of the present application.

Detailed Description

The embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or similar components or process flows.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, method steps, operations, components, and/or components, but do not preclude the presence or addition of further features, values, method steps, operations, components, and/or groups thereof.

It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is described as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

Referring to fig. 1 to 3, fig. 1 is an exploded view of an embodiment of a millimeter wave radar antenna according to the present disclosure, fig. 2 is a combination view of the embodiment of the millimeter wave radar antenna of fig. 1, and fig. 3 is a cross-sectional view of the embodiment of the millimeter wave radar antenna of fig. 1. As shown in fig. 1 to 3, in the present embodiment, the millimeter wave radar antenna 100 includes: the dielectric substrate comprises a metal substrate 110, a first dielectric plate 120 arranged on the metal substrate 110, a second dielectric plate 130 arranged on the first dielectric plate 120, a cover plate 140 arranged on the second dielectric plate 130, a super-surface structure 150, a driving patch 160 and a feeding probe 170. Wherein, the metal base plate 110 is provided with a hole 112 (as shown in fig. 1); the first dielectric plate 120 is formed with a feeding through hole 122 (as shown in fig. 3), and the feeding through hole 122 corresponds to the hole 112.

In the present embodiment, the materials of the metal base plate 110, the super-surface structure 150, the driving patch 160 and the feeding probe 170 may include, but are not limited to, copper, silver, aluminum, zinc, gold, or alloys thereof; the material of the first dielectric plate 120 and the second dielectric plate 130 may include, but is not limited to, a polymer material (e.g., Polyimide (PI), Polytetrafluoroethylene (PTFE)), a ceramic material, a plastic, a composite material, a Liquid Crystal Polymer (LCP), an epoxy laminate of a fiberglass sheet (e.g., FR-4, FR-5), or a combination thereof; the material of the cover plate 140 may include, but is not limited to, glass; the feed probe 170 may be, but is not limited to, a coaxial probe; however, the present embodiment is not limited to the present application, and can be adjusted according to actual requirements.

In one embodiment, the first dielectric plate 120 and the second dielectric plate 130 may be made of a liquid crystal polymer with low dielectric loss to reduce signal loss, the dielectric constant (Dk) of the liquid crystal polymer may be 3.0, and the dielectric loss (Df) of the liquid crystal polymer may be 0.002; the cover plate 140 may be made of glass, the dielectric constant (Dk) of the glass may be 7.8, and the dielectric loss (Df) may be 0.002; however, the present invention is not limited to the embodiment, and can be adjusted according to the actual requirements.

In an embodiment, the thickness of the first dielectric plate 120 may be, but not limited to, 0.1 millimeter (mm), the thickness of the second dielectric plate 130 may be, but not limited to, 0.15mm, and the thickness of the cover plate 140 may be, but not limited to, 0.55 mm. For example, the thicknesses of the first dielectric plate 120 and the second dielectric plate 130 may be the same.

In the present embodiment, the super-surface structure 150 is disposed on the surface of the second dielectric board 130 facing the cover plate 140, and includes a plurality of super-surface patches 152 spaced apart from each other. The number of the super surface patches 152 may be, but is not limited to, thirty-six, and a specific distance is maintained between the super surface patches 152, but the present embodiment is not limited to the present application and can be adjusted according to actual requirements. In one embodiment, the plurality of super-surface patches 152 are arranged in a rectangular matrix; for example, when the number of the super surface patches 152 is, but not limited to, thirty-six, the super surface patches 152 may be disposed on the second dielectric board 130 in a 6 × 6 matrix.

In this embodiment, the driving patch 160 is disposed on the surface of the first dielectric board 120 facing the second dielectric board 130, and is disposed corresponding to the central position of the arrangement of the plurality of super-surface patches 152, so that the super-surface structure 150 has a better symmetry in the radiation direction through the second resonance generated by the close coupling with the driving patch 160.

In an embodiment, when the plurality of super surface patches 152 are arranged in a rectangular matrix, the centered position may be, but is not limited to, a diagonal intersection of the plurality of super surface patches 152 configuration area (i.e., rectangular area).

In one embodiment, the driver patch 160 includes a patch body 162 and a matching prong 164; the matching stub 164 is connected to the feed probe 170 and used to realize impedance matching of the millimeter wave radar antenna 100. In other words, the impedance of millimeter-wave radar antenna 100 may be matched through the design of matching stub 164.

In one embodiment, the matching branches 164 and/or the patch body 162 are rectangular, but this embodiment is not intended to limit the present disclosure, and can be adjusted according to actual requirements. It is noted that the matching limbs 164 need to be similar in shape to the patch body 162.

In an embodiment, when the patch body 162 has a rectangular shape and the super-surface patches 152 are arranged in a rectangular matrix, the central point of the patch body 162 (i.e., the intersection point of the diagonals of the rectangular shape) may be disposed at a position directly opposite to the intersection point of the diagonals of the configuration areas (i.e., the rectangular areas) of the super-surface patches 152, so as to ensure that the radiation direction ranges of the millimeter-wave radar antenna 100 in the spatial distribution are symmetrically disposed.

In this embodiment, the feeding probe 170 is disposed through the metal base plate 110 and the first dielectric plate 120 through the feeding through hole 122 and the corresponding hole 112, and one end of the feeding probe 170 is connected to the driving patch 160 for feeding the driving patch 160, so that the driving patch 160 generates a first resonance, and the super-surface structure 150 generates a second resonance through the driving patch 160. Specifically, millimeter-wave radar antenna 100 includes a main radiation section including driving patch 160, and an auxiliary radiation section including super-surface structure 150 provided in correspondence with driving patch 160; when the millimeter-wave radar antenna 100 operates, the feeding probe 170 feeds the driving patch 160 to excite the driving patch 160 to generate a first resonance, and the super-surface structure 150 generates a second resonance through close coupling with the driving patch 160, so that the first resonance generated by the driving patch 160 and the second resonance generated by the super-surface structure 150 act together, thereby greatly increasing the operating bandwidth of the millimeter-wave radar antenna 100. Because the driving patch 160 and the super-surface structure 150 can have strong electromagnetic coupling, a small distance can be kept between the driving patch 160 and the super-surface structure 150 (that is, the thickness of the first dielectric plate 120 can be small), so that the millimeter-wave radar antenna 100 can have a low profile, and the requirement of the market on miniaturization of the millimeter-wave radar antenna 100 can be met.

In an embodiment, the millimeter-wave radar antenna 100 further includes a coaxial connector 210, disposed on a surface of the metal base plate 110 away from the first dielectric plate 120, and connected to the other end of the feed probe 170. The coaxial connector 210 feeds the driving patch 160 through the feeding probe 170, the coaxial connector 210 may be an SMA connector, an SMP connector, an N-type coaxial connector, or a waveguide interface connector, and its characteristic impedance may be adjusted according to actual requirements.

In an embodiment, millimeter-wave radar antenna 100 further includes a first adhesive layer 180 and a second adhesive layer 190, first dielectric plate 120 is bonded to second dielectric plate 130 through first adhesive layer 180, and second dielectric plate 130 is bonded to cover plate 140 through second adhesive layer 190. The thickness of the first adhesive layer 180 and the second adhesive layer 190 may be, but is not limited to, 0.06mm, the dielectric constant (Dk) of the first adhesive layer 180 and the second adhesive layer 190 may be 4.0, and the dielectric loss (Df) may be 0.02; however, the present invention is not limited to the embodiment, and can be adjusted according to the actual requirements.

Referring to fig. 4 to 6, fig. 4 is a graph illustrating return loss simulation of the millimeter wave radar antenna of fig. 1 according to an embodiment, fig. 5 is a graph illustrating radiation gain simulation of the millimeter wave radar antenna of fig. 1 according to an embodiment, and fig. 6 is a graph illustrating simulated radiation patterns of the millimeter wave radar antenna of fig. 1 according to an embodiment. In the embodiment of fig. 4-6, the metal base plate 110, the super-surface structure 150, the driving patch 160 and the feeding probe 170 may be made of copper; the first dielectric plate 120 and the second dielectric plate 130 may be made of LCP; the cover plate 140 may be made of glass; the feed probe 170 may be a coaxial probe; the liquid crystal polymer may have a dielectric constant (Dk) of 3.0 and a dielectric loss (Df) of 0.002; the glass may have a dielectric constant (Dk) of 7.8 and a dielectric loss (Df) of 0.002; the dielectric constant (Dk) of the first adhesive layer 180 and the second adhesive layer 190 may be 4.0, and the dielectric loss (Df) may be 0.02; the thickness of the first dielectric sheet 120 may be, but is not limited to, 0.1 mm; the thickness of the second dielectric sheet 130 may be, but is not limited to, 0.15 mm; the thickness of the cover plate 140 may be, but is not limited to, 0.55 mm; the thickness of the first adhesive layer 180 and the second adhesive layer 190 may be, but is not limited to, 0.06 mm; the number of the super surface patches 152 may be thirty-six and are disposed on the second dielectric board 130 in a 6 × 6 matrix.

The curve in fig. 4 is a simulation curve of the reflection coefficient S11 of the millimeter-wave radar antenna 100 varying with the operating frequency, and it can be seen from fig. 4 that the bandwidth of the millimeter-wave radar antenna 100 not only includes the central operating frequency of 60.5GHz, but also the bandwidth less than-10 dB (about 56 to 68GHz (19%)) can reach more than 10 GHz. Fig. 5 shows that the gain in the main radiation direction (i.e., Phi is 0 degrees and Theta is 0 degrees, where Phi is the included angle on the X-Y plane and Theta is the included angle on the Z-X plane) in the operating frequency band range (i.e., 59 to 63GHz) of the millimeter wave radar antenna 100 is maintained at 8dB or more, as shown in fig. 5. Fig. 6 shows that the broken line is a simulation curve of the gain of the millimeter-wave radar antenna 100 with the operating frequency of 60.5GHz in different radiation directions at Phi being 0 degrees (i.e., the E-plane (XOZ-plane)), and the solid line is a simulation curve of the gain of the millimeter-wave radar antenna 100 with the operating frequency of 60.5GHz in different radiation directions at Phi being 90 degrees (i.e., the H-plane (YOZ-plane)), and it can be seen from fig. 6 that the millimeter-wave radar antenna 100 has the characteristic of wide-beam low-gain fluctuation, and the gain is greater than-3 dB in the radiation direction range of-60 degrees to 60 degrees, thereby effectively solving the serious problems of antenna impedance mismatch, pattern distortion, and the like caused by the physical space limitation when the current AiP technology is applied to an antenna.

Referring to fig. 7 to 8, fig. 7 is an exploded view of another embodiment of a millimeter wave radar antenna according to the present application, and fig. 8 is a cross-sectional view of the millimeter wave radar antenna of fig. 7. As shown in fig. 7 to 8, in addition to the millimeter wave radar antenna 200 of the present embodiment including the metal base plate 110, the first dielectric plate 120, the second dielectric plate 130, the first adhesive layer 180 and the second adhesive layer 190 of the millimeter wave radar antenna 100 of the above embodiment, the millimeter wave radar antenna 200 further includes a super-surface structure 250, an even number of driving patches 160, and the same number of feeding probes 170 as the number of the driving patches 160; the super-surface structure 250 and the super-surface structure 150 are similar or identical, and the number of the super-surface patches 252 included in the super-surface structure 250 may be different from the number of the super-surface patches 152 included in the super-surface structure 150; every two symmetrically arranged driving patches 160 form an active unit 280, and the plurality of super-surface patches 252 are uniformly arranged corresponding to the even number of driving patches 160; the number of the feed probes 170, the feed through holes 122, the holes 112 and the driving patches 160 is the same, the feed probes 170 correspondingly penetrate through the feed through holes 122 and the holes 112 one to one and are correspondingly connected to the driving patches 160, and the two driving patches 160 in one active unit 280 are differentially fed through the correspondingly connected feed probes 170 (i.e., the feeding phases of the two driving patches 160 in one active unit 280 are opposite) to provide beam scanning.

Specifically, the millimeter-wave radar antenna 200 includes a main radiation section including an even number of driving patches 160 and an auxiliary radiation section including a super-surface structure 250 provided corresponding to the even number of driving patches 160; when millimeter-wave radar antenna 200 is in operation, millimeter-wave radar antenna 200 may provide beam scanning by the active elements 280 it includes, since the feeding phases of the two driven patches 160 in one active element 280 are opposite.

In this embodiment, the number of the driving patches 160 may be four; the number of active units 280 may be two, with two active units 280 providing beam scanning for millimeter wave radar antenna 200; the super-surface structure 250 may include fifty six mutually-spaced super-surface patches 252, the super-surface patches 252 may be disposed on the second dielectric board 130 in an 8 × 7 matrix manner, the fifty six mutually-spaced super-surface patches 252 are uniformly arranged corresponding to the four driving patches 160, and the four driving patches 160 are uniformly arranged corresponding to the central positions where the plurality of super-surface patches 252 are arranged, but this embodiment is not intended to limit the present application, and may be adjusted according to actual requirements.

In one embodiment, each of the driver patches 160 includes matching stubs 164; the matching stubs 164 of the feed probes 170 respectively connected to the two driving patches 160 in one active unit 280 are arranged at 180 °. In any active unit 280, since the two driving patches 160 are fed differentially by the corresponding connected feeding probes 170 (i.e. the feeding phases of the two driving patches 160 are 180 degrees apart), the radiation patterns synthesized after the two driving patches 160 are fed and excited have symmetry in space.

In an embodiment, when the plurality of super surface patches 252 are arranged in a rectangular matrix, the centered position may be, but is not limited to, a diagonal intersection of the plurality of super surface patches 252 configuration area (i.e., rectangular area).

In an embodiment, when the patch body 162 has a rectangular shape and the patch body 162 and the super-surface patches 252 are both arranged in a rectangular matrix, the intersection points of the diagonals of the arrangement regions (i.e., rectangular regions) of the even number of driving patches 160 may be directly opposite to the intersection points of the diagonals of the arrangement regions (i.e., rectangular regions) of the super-surface patches 252, so as to ensure that the radiation direction ranges of the millimeter-wave radar antenna 200 in the spatial distribution are symmetrically arranged.

In an embodiment, the millimeter-wave radar antenna 200 further includes coaxial connectors 210 disposed on the surface of the metal base plate 110 away from the first dielectric plate 120, the number of the coaxial connectors 210, the number of the feed probes 170, and the number of the drive patches 160 are the same, and the coaxial connectors 210 are correspondingly connected to one end of the feed probes 170, and are used for feeding the connected drive patches 160 through the correspondingly connected feed probes 170.

Referring to fig. 9 to 13, fig. 9 is a graph illustrating simulated return loss of the millimeter wave radar antenna of fig. 7 according to an embodiment, fig. 10 is a graph illustrating simulated isolation of the millimeter wave radar antenna of fig. 7 according to an embodiment, fig. 11 is a graph illustrating simulated radiation gain of the millimeter wave radar antenna of fig. 7 according to an embodiment, fig. 12 is a graph illustrating simulated radiation patterns of an active unit of the millimeter wave radar antenna of fig. 7 according to an embodiment, and fig. 13 is a graph illustrating simulated radiation patterns of another active unit of the millimeter wave radar antenna of fig. 7 according to an embodiment. In the embodiment of fig. 9-13, the metal base plate 110, the super-surface structure 250, the driving patch 160 and the feeding probe 170 may be made of copper; the first dielectric plate 120 and the second dielectric plate 130 may be made of LCP; the cover plate 140 may be made of glass; the feed probe 170 may be a coaxial probe; the liquid crystal polymer may have a dielectric constant (Dk) of 3.0 and a dielectric loss (Df) of 0.002; the glass may have a dielectric constant (Dk) of 7.8 and a dielectric loss (Df) of 0.002; the dielectric constant (Dk) of the first adhesive layer 180 and the second adhesive layer 190 may be 4.0, and the dielectric loss (Df) may be 0.02; the thickness of the first dielectric sheet 120 may be, but is not limited to, 0.1 mm; the thickness of the second dielectric sheet 130 may be, but is not limited to, 0.15 mm; the thickness of the cover plate 140 may be, but is not limited to, 0.55 mm; the thickness of the first adhesive layer 180 and the second adhesive layer 190 may be, but is not limited to, 0.06 mm; the number of the super surface patches 252 may be fifty-six, and are disposed on the second dielectric board 130 in an 8 × 7 matrix manner; the number of driver patches 160 may be four; the number of active cells 280 may be two; the diagonal intersection of the deployment region of the driver patch 160 may be directly opposite the diagonal intersection of the deployment regions of the plurality of super-surface patches 252.

In fig. 9, the broken line is a simulation curve of the reflection coefficient S11 of the millimeter wave radar antenna 200 varying with the operating frequency, the dotted line is a simulation curve of the reflection coefficient S22 of the millimeter wave radar antenna 200 varying with the operating frequency, the long line is a simulation curve of the reflection coefficient S33 of the millimeter wave radar antenna 200 varying with the operating frequency, and the solid line is a simulation curve of the reflection coefficient S44 of the millimeter wave radar antenna 200 varying with the operating frequency. As can be seen from fig. 9, the bandwidth of the millimeter wave radar antenna 200 not only includes the central operating frequency of 60.5GHz, but also the bandwidth of less than-10 dB (about 56 to 68GHz (19%)) can reach 10GHz or more.

In fig. 10, the dotted line is a simulation curve of the isolation S21 of the millimeter wave radar antenna 200 at different operating frequencies, the dash line is a simulation curve of the isolation S32 of the millimeter wave radar antenna 200 at different operating frequencies, and the solid line is a simulation curve of the isolation S43 of the millimeter wave radar antenna 200 at different operating frequencies. Fig. 10 shows that the isolation degrees S21, S32, and S43 of the millimeter wave radar antenna 200 are less than-15.00 dB, and have good isolation degrees.

Fig. 11 shows a simulation curve of the variation of the radiation gain of the millimeter-wave radar antenna 200 with the operating frequency, and it can be known from fig. 11 that the gain in the main radiation direction (i.e., Phi is 0 degrees and Theta is 0 degrees) in the operating frequency band range (i.e., 58 to 63GHz) of the millimeter-wave radar antenna 200 is maintained at 8dB or more.

In fig. 12, the dotted line is a gain simulation curve of one active unit 280 of the millimeter wave radar antenna 200 with the operating frequency of 60.5GHz in different radiation directions on the E-plane, and the solid line is a gain simulation curve of one active unit 280 of the millimeter wave radar antenna 200 with the operating frequency of 60.5GHz in different radiation directions on the H-plane; in fig. 13, the broken line is a gain simulation curve of the other active element 280 of the millimeter wave radar antenna 200 having the operating frequency of 60.5GHz in different radiation directions on the E-plane, and the solid line is a gain simulation curve of the other active element 280 of the millimeter wave radar antenna 200 having the operating frequency of 60.5GHz in different radiation directions on the H-plane. Fig. 12 and 13 show that both the active unit 280 and the other active unit 280 of the millimeter wave radar antenna 200 have the characteristic of wide-beam low-gain fluctuation, and the gain is greater than-3 dB in the radiation direction range from-60 degrees to 60 degrees, which effectively solves the serious problems of antenna impedance mismatch, pattern distortion and the like caused by the limitation of physical space when the current AiP technology is applied to the antenna.

In addition, as can be seen from fig. 12 and 13, when one active unit 280 and the other active unit 280 of the millimeter-wave radar antenna 200 are excited simultaneously, due to the introduction of the reverse feeding technique, under excitation with a given phase difference, the array pattern synthesized by the two active units 280 has consistency on the two main planes of the space, and the equalization of the reception intensity of the echo signal in each direction by the millimeter-wave radar antenna 200 can be ensured.

Referring to fig. 13 and 14, fig. 13 is a block diagram of an embodiment of an electronic device having a millimeter wave radar antenna according to the present application, and fig. 14 is a block diagram of another embodiment of an electronic device having a millimeter wave radar antenna according to the present application. As shown in fig. 13 and 14, the electronic device 300 includes: millimeter-wave radar antenna 100, electronic device 400 includes: millimeter-wave radar antenna 200. Among others, the

electronic devices

300 and 400 may include, for example, at least one of a smart phone, a Personal Computer (PC), a mobile phone, a video phone, an electronic book reader (e-book reader), a Laptop computer (Laptop), a workstation, a server, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), an MPEG-1 audio layer-3 (MP3) player, a mobile phone medical device, a camera, and a wearable device.

To sum up, millimeter wave radar antenna and electron device of this application embodiment pass through super surface loading technique, introduce the super surface structure who has Reactive Impedance Surface (RIS), make millimeter wave radar antenna during operation, give the drive paster by feed probe feed, produce first resonance with the excitation drive paster, super surface structure produces the second resonance through the close coupling with the drive paster, consequently, the produced first resonance of drive paster and the produced second resonance combined action of super surface structure, there is the impedance mismatch that leads to the antenna because of the restriction of physical space in the antenna of solving present AiP technique, serious problems such as directional diagram distortion. In addition, the millimeter wave radar antenna is designed by seamlessly stacking and combining multiple layers of materials, so that the millimeter wave radar antenna has good sealing performance and stability, and the normal operation of a radar identification module and an electronic device applying the millimeter wave radar antenna on the identification function is ensured.

Although the above-described elements are included in the drawings of the present application, it is not excluded that more additional elements may be used to achieve better technical results without departing from the spirit of the present invention.

Although the present invention has been described using the above embodiments, it should be noted that these descriptions are not intended to limit the present invention. Rather, this utility model encompasses modifications and similar arrangements that would be apparent to those skilled in the art. The scope of the claims is, therefore, to be construed in the broadest manner to include all such obvious modifications and similar arrangements.

Claims

1. A millimeter-wave radar antenna, comprising:

the metal bottom plate is provided with a hole;

the first dielectric plate is arranged on the metal bottom plate and is provided with a feed through hole, and the feed through hole corresponds to the hole;

the second dielectric plate is arranged on the first dielectric plate;

the cover plate is arranged on the second medium plate;

the super-surface structure is arranged on the surface of the second dielectric plate facing the cover plate and comprises a plurality of mutually-spaced super-surface patches;

the driving patches are arranged on the surface, facing the second dielectric slab, of the first dielectric slab and are arranged corresponding to the central positions where the super-surface patches are arranged; and

and the feed probe penetrates through the metal bottom plate and the first dielectric plate through the feed through hole and the hole corresponding to the feed through hole, one end of the feed probe is connected with the drive patch and used for feeding the drive patch, so that the drive patch generates a first resonance, and the super-surface structure generates a second resonance through the drive patch.

2. The millimeter-wave radar antenna of claim 1, wherein the driver patch includes a patch body and matching stubs; the matching branch is connected with the feed probe and used for realizing impedance matching of the millimeter wave radar antenna.

3. The millimeter-wave radar antenna of claim 2, wherein the matching stub and/or the patch body are rectangular in shape.

4. The millimeter wave radar antenna according to claim 1, further comprising a first adhesive layer and a second adhesive layer, wherein the first dielectric plate is bonded to the second dielectric plate through the first adhesive layer, and the second dielectric plate is bonded to the cover plate through the second adhesive layer.

5. The millimeter wave radar antenna according to claim 1, wherein the first dielectric plate and the second dielectric plate are made of liquid crystal polymer.

6. The millimeter-wave radar antenna of claim 1, wherein the plurality of super-surface patches are arranged in a rectangular matrix.

7. The millimeter wave radar antenna according to claim 1, further comprising a coaxial connector disposed on a surface of the metal base plate remote from the first dielectric plate and connected to the other end of the feed probe.

8. The millimeter wave radar antenna of claim 1, wherein the number of the driving patches is even, every two symmetrically arranged driving patches form an active unit, and the plurality of super-surface patches are uniformly arranged corresponding to the even number of the driving patches; the number of the feed probes, the number of the feed through holes and the number of the holes are the same as the number of the drive patches, the feed probes penetrate through the feed through holes and the holes in a one-to-one correspondence mode and are correspondingly connected with the drive patches, and the two drive patches in one active unit carry out differential feeding through the feed probes correspondingly connected with the drive patches so as to provide beam scanning.

9. The millimeter-wave radar antenna of claim 8, wherein each of the driven patches includes matching stubs; in the active unit, the matching branches of the feed probes respectively connected to the two driving patches are arranged at 180 degrees.

10. An electronic device, comprising: the millimeter wave radar antenna of any one of claims 1 to 9.