TWI777560B - Millimeter-wave radar antenna and electronic device - Google Patents

Abstract

Disclosed is a millimeter-wave radar antenna, which includes: a metal base plate, a first dielectric plate, a second dielectric plate, a cover plate, a metasurface structure, a driving patch and a feeding probe. The first dielectric plate is disposed on the metal base plate. The second dielectric plate is disposed on the first dielectric plate. The cover plate is disposed on the second dielectric plate. The metasurface structure is disposed on a surface of the second dielectric plate facing the cover plate, and includes a plurality of metasurface patches spaced apart from each other. The drive patch is disposed on a surface of the first dielectric plate facing the second dielectric plate, and is disposed corresponding to a center position of the arrangement of the plurality of metasurface patches. The feeding probe passes through the metal base plate and the first dielectric plate, and is connected to the driving patch for feeding power to the driving patch, so that the driving patch generates a first resonance, and the metasurface structure generates a second resonance through the driving patch.

Description

Millimeter wave radar antenna and electronic device

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

Radar identification modules applied to electronic devices are highly integrated, and external components such as the shell, back cover, metal frame, and display of the electronic device need to be considered when designing the millimeter-wave radar antenna in the radar identification module. , there are difficulties in realizing the normal operation of the radar identification module.

The current solution is to use the less integrated Antenna-in-Package (AiP) technology, which can pass through the glass lens and leave a certain gap between the antenna, so that the antenna has no contact with the housing and display of the electronic device. , only need to fine-tune the structure of the antenna to achieve good impedance matching and radiation pattern. However, typical antennas such as patches or planar dipoles are generally used for the antennas using the above-mentioned design with a gap, which has the problem that the bandwidth of the antenna is narrow, and the optimization of the structure is limited in improving the performance of the antenna. In addition, since there is a certain gap between the glass lens and the antenna, when the electronic device faces external forces (hand-held and squeezed, etc.), the internal structure of the antenna may change, which will adversely affect the electrical performance and reduce the application. The reliability and accuracy of the target identification when the radar identification module of the antenna works normally.

In view of this, a design is proposed in the AiP technology to attach the antenna to the external components, so that the antenna and the shell and frame of the electronic device are fixed together. However, due to the limitation of physical space, the electronic integrated circuit module of the electronic device is affected The challenges of EMI and EMC lead to serious problems such as impedance mismatch and pattern distortion of the antenna.

The embodiments of the present application provide a millimeter-wave radar antenna and an electronic device, which can effectively solve the serious problems such as impedance mismatch and pattern distortion of the antenna due to physical space limitations when the current AiP technology is applied to the antenna.

In order to solve the above technical problems, this application is implemented as follows:

In a first aspect, a millimeter-wave radar antenna is provided, which includes: a metal base plate, a first dielectric plate disposed on the metal base plate, a second dielectric plate disposed on the first dielectric plate, and a second dielectric plate disposed on the second dielectric plate. The cover plate, the metasurface structure, the driving patch and the feeding probe on the electric plate; the metasurface structure is arranged on the surface of the second dielectric plate facing the cover plate, and includes a plurality of mutually spaced metasurface stickers The driving patch is arranged on the surface of the first dielectric plate facing the second dielectric plate, and is arranged in the center position corresponding to the arrangement of these Metasurface patches; and the feeding probe is passed through the metal base plate and the first A dielectric plate is connected to the driving patch for feeding the driving patch, so that the driving patch generates a first resonance, and the metasurface structure generates a second resonance through the driving patch.

In one embodiment, the driving patch includes a patch body and a matching branch; the matching branch is connected to the feeding probe and is used to realize impedance matching of the millimeter-wave radar antenna.

In one embodiment, the shape of the matching branch and/or the patch body is rectangular.

In one 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 passes through The second adhesive layer is bonded to the cover plate.

In one embodiment, the material of the first dielectric plate and the second dielectric plate is liquid crystal polymer.

In one embodiment, the plurality of Metasurface patches are arranged in a rectangular matrix.

In one embodiment, the number of driving patches is an even number, every two symmetrically arranged driving patches constitute an active unit, and the plurality of Metasurface patches are evenly arranged corresponding to the even number of driving patches; The number of pins is the same as the number of drive patches, the feed probes are connected to the drive patches one-to-one, and the two drive patches in one active unit are differentially fed through the correspondingly connected feed probes to provide Beam scanning.

In one embodiment, each driving patch includes a matching branch; the matching branches of the feeding probes respectively connected to the two driving patches in one active unit are arranged in a 180∘ configuration.

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

In the embodiment of the present application, the millimeter-wave radar antenna uses the metasurface loading technology to introduce a metasurface structure with reactive impedance surfaces (RIS), so that when the millimeter-wave radar antenna is working, the feed probe is The drive patch is fed with power to excite the drive patch to generate the first resonance, and the metasurface structure generates the second resonance through the tight coupling with the drive patch. Therefore, the first resonance generated by the drive patch and the metasurface structure The generated second resonance works together to solve the serious problems of the antenna in the current AiP technology, such as impedance mismatch and pattern distortion of the antenna due to the limitation of physical space. In addition, the millimeter-wave radar antenna is designed through seamless stacking of multi-layer materials, which has good sealing and stability, and ensures the normal operation of the radar identification module and electronic device using the millimeter-wave radar antenna in terms of identification function.

The embodiments of the present invention will be described below with reference to the relevant drawings. In the figures, the same reference numbers refer to the same or similar elements or method flows.

It must be understood that words such as "comprising" and "comprising" used in this specification are used to indicate the existence of specific technical features, values, method steps, operation processes, elements and/or elements, but do not exclude the possibility of Plus more technical features, values, method steps, job processes, elements, elements, or any combination of the above.

It must be understood that when an element is described as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, and 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.

Please refer to FIGS. 1 to 3 . FIG. 1 is an exploded view of an embodiment of a millimeter-wave radar antenna according to the present application, FIG. 2 is a combined view of an embodiment of the millimeter-wave radar antenna of FIG. 1 , and FIG. 3 is a millimeter-wave radar antenna of FIG. 1 . A cross-sectional view of an embodiment of a wave radar antenna. As shown in FIGS. 1 to 3 , in this embodiment, the millimeter-wave radar antenna 100 includes: a metal base plate 110 , a first dielectric plate 120 disposed on the metal base plate 110 , and a first dielectric plate 120 disposed on the first dielectric plate 120 . The second dielectric plate 130 , the cover plate 140 disposed on the second dielectric plate 130 , the metasurface structure 150 , the driving patch 160 and the feeding probes 170 . The metal base plate 110 is provided with holes 112 (as shown in FIG. 1 ); the first dielectric plate 120 is provided with feed through holes 122 (as shown in FIG. 3 ), and the feed through holes 122 correspond to the holes 112 .

In this embodiment, the materials of the metal base plate 110 , the metasurface 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 first medium The materials of the electric plate 120 and the second dielectric plate 130 may include, but are not limited to, polymer materials (eg, polyimide (PI), polytetrafluoroethylene (PTFE)), ceramic materials, plastics, composite materials, Liquid crystal polymer (LCP), epoxy laminate of glass fiber sheets (eg: FR-4, FR-5) or a combination thereof; the material of the cover plate 140 may include but not limited to glass; feed probe 170 can be, but is not limited to, a coaxial probe; however, this embodiment is not intended to limit the application, and can be adjusted according to actual needs.

In one embodiment, the material of the first dielectric plate 120 and the second dielectric plate 130 may use 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) 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; but this The embodiments are not intended to limit the present application, and can be adjusted according to actual needs.

In one embodiment, the thickness of the first dielectric plate 120 may be, but not limited to, 0.1 millimeters (mm), the thickness of the second dielectric plate 130 may be, but not limited to, 0.15 mm, and the thickness of the cover plate 140 may be, but not limited to, 0.15 mm. It is limited to 0.55mm, but this embodiment is not intended to limit the application, and can be adjusted according to actual needs. For example, the thicknesses of the first dielectric plate 120 and the second dielectric plate 130 may be the same.

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

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

In one embodiment, when the plurality of Metasurface patches 152 are arranged in a rectangular matrix, the center position may be, but not limited to, the location of the configuration area (ie, the rectangular area) of the plurality of Metasurface patches 152 . Diagonal intersection.

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

In one embodiment, the shape of the matching branch 164 and/or the patch body 162 is a rectangle, but this embodiment is not intended to limit the present application, and may be adjusted according to actual needs. It should be noted that the shape of the matching branch 164 needs to be similar to the shape of the patch body 162 .

In one embodiment, when the shape of the patch body 162 is a rectangle and the plurality of Metasurface patches 152 are arranged in a rectangular matrix, the setting of the center point of the patch body 162 (ie, the intersection of the diagonal lines of the rectangular shape) The positions may be directly opposite to the diagonal intersections of the configuration areas (ie, rectangular areas) of the plurality of metasurface patches 152 to ensure that the radiation direction range of the millimeter-wave radar antenna 100 in the spatial distribution is symmetrical.

In this embodiment, the feeding probe 170 penetrates 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 , is used to feed the driving patch 160 , so that the driving patch 160 generates a first resonance, and the metasurface structure 150 generates a second resonance through the driving patch 160 . Specifically, the millimeter-wave radar antenna 100 includes a main radiating part and an auxiliary radiating part, the main radiating part includes a driving patch 160 , and the auxiliary radiating part includes a metasurface structure 150 corresponding to the driving patch 160 ; When the radar antenna 100 is working, the feeding probe 170 feeds the driving patch 160 to excite the driving patch 160 to generate the first resonance, and the metasurface structure 150 generates the second resonance through the tight coupling with the driving patch 160 . Therefore, the first resonance generated by the driving patch 160 and the second resonance generated by the metasurface structure 150 work together, thereby greatly increasing the operating bandwidth of the millimeter-wave radar antenna 100 . Wherein, due to the strong electromagnetic coupling between the driving patch 160 and the metasurface structure 150, a small distance (ie, the first dielectric plate 120) between the driving patch 160 and the metasurface structure 150 can be maintained. The thickness of the millimeter-wave radar antenna 100 can be very small), so that the millimeter-wave radar antenna 100 can have a low profile characteristic, which can meet the miniaturization requirements of the market for the millimeter-wave radar antenna 100 .

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

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

矩陣方式設置於第二介電板130上。Please refer to FIGS. 4 to 6 . FIG. 4 is a simulated curve diagram of return loss of an embodiment of the millimeter-wave radar antenna of FIG. 1 , FIG. 5 is a simulated curve of radiation gain of an embodiment of the millimeter-wave radar antenna of FIG. 1 , and FIG. 6 A radiation pattern is simulated for an embodiment of the millimeter-wave radar antenna of FIG. 1 . In the embodiments of FIGS. 4 to 6 , the metal base plate 110 , the metasurface 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 The material of the liquid crystal polymer can be LCP; the material of the cover plate 140 can be glass; the feeding probe 170 can be a coaxial probe; the dielectric constant (Dk) of the liquid crystal polymer can be 3.0, and the dielectric loss (Df) can be 0.002; the dielectric constant (Dk) of the glass may be 7.8, the dielectric loss (Df) may be 0.002; the dielectric constant (Dk) of the first adhesive layer 180 and the second adhesive layer 190 may be 4.0, The dielectric loss (Df) may be 0.02; the thickness of the first dielectric plate 120 may be, but not limited to, 0.1 mm; the thickness of the second dielectric plate 130 may be, but not limited to, 0.15 mm; the thickness of the cover plate 140 may be, but not limited to, 0.15 mm. Not limited to 0.55mm; the thickness of the first adhesive layer 180 and the second adhesive layer 190 may be but not limited to 0.06mm; the number of Metasurface patches 152 may be thirty-six, and the

It is arranged on the second dielectric plate 130 in a matrix manner.

度且

度，所述Phi為X-Y平面上的夾角，所述Theta為Z-X平面上的夾角）上的增益保持在8dB以上。圖6中的虛線為在

度（即E面（XOZ面））上工作頻率為60.5GHz的毫米波雷達天線100在不同輻射方向上的增益模擬曲線，實線為在

度（即H面（YOZ面））上工作頻率為60.5GHz的毫米波雷達天線100在不同輻射方向上的增益模擬曲線，由圖6中可知毫米波雷達天線100具備寬波束低增益波動的特性，在-60度至60度的輻射方向範圍內增益均大於-3dB，有效地解決目前AiP技術應用於天線時，天線存在因物理空間的限制導致天線的阻抗失配、方向圖畸變等嚴重問題。The curve in FIG. 4 is a simulation curve of the reflection coefficient S11 of the millimeter-wave radar antenna 100 changing with the operating frequency. It can be seen from FIG. 4 that the bandwidth of the millimeter-wave radar antenna 100 includes not only the center operating frequency of 60.5 GHz, but also the frequency less than -10 dB. The wide width (about 56 to 68GHz (19%)) can reach more than 10GHz. The curve in FIG. 5 is a simulation curve of the radiation gain of the millimeter-wave radar antenna 100 as a function of the operating frequency. It can be seen from FIG. 5 that the operating frequency bandwidth of the millimeter-wave radar antenna 100 (ie, 59 to 63 GHz) is in the main radiation direction (ie, 59 to 63 GHz).

degree and

degree, the Phi is the included angle on the XY plane, and the Theta is the included angle on the ZX plane), and the gain is kept above 8dB. The dashed line in Figure 6 is the

The gain simulation curves of the millimeter-wave radar antenna 100 with an operating frequency of 60.5GHz in different radiation directions on the E surface (ie the E surface (XOZ surface)), the solid line is the

The gain simulation curves of the millimeter-wave radar antenna 100 with an operating frequency of 60.5 GHz on the H-plane (ie the H-plane (YOZ plane)) in different radiation directions, it can be seen from FIG. 6 that the millimeter-wave radar antenna 100 has the characteristics of wide beam and low gain fluctuation , the gain is greater than -3dB in the radiation direction range from -60 degrees to 60 degrees, which effectively solves the serious problems of antenna impedance mismatch and pattern distortion caused by the limitation of physical space when the current AiP technology is applied to antennas. .

Please refer to FIGS. 7 to 8 , FIG. 7 is an exploded view of another embodiment of the millimeter-wave radar antenna according to the present application, and FIG. 8 is a cross-sectional view of an embodiment of the millimeter-wave radar antenna of FIG. 7 . As shown in FIGS. 7 to 8 , the millimeter-wave radar antenna 200 of this embodiment includes the metal base plate 110 , the first dielectric plate 120 , the second dielectric plate 130 , and the cover plate of the millimeter-wave radar antenna 100 of the above-mentioned embodiment. 140 In addition to the first adhesive layer 180 and the second adhesive layer 190, the millimeter-wave radar antenna 200 further includes a metasurface 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 ; wherein, the metasurface structure 250 and the metasurface structure 150 are similar or identical, and the number of the metasurface patches 252 included in the metasurface structure 250 is the same as the number of the metasurface patches 152 included in the metasurface structure 150 The number can be different; every two symmetrically arranged drive patches 160 form an active unit 280, and the plurality of Metasurface patches 252 are evenly arranged corresponding to the even number of drive patches 160; the feeding probes 170, The feeding through holes 122, the holes 112 and the driving patches 160 have the same number. The feeding probes 170 pass through the feeding through holes 122 and the holes 112 in a one-to-one correspondence and are connected to the driving patches 160 and two of the active units 280 correspondingly. The driving patches 160 are differentially fed through correspondingly connected feeding probes 170 (ie, the feeding phases of the two driving patches 160 in one active unit 280 are opposite to each other) to provide beam scanning.

Specifically, the millimeter-wave radar antenna 200 includes a main radiating portion and an auxiliary radiating portion, the main radiating portion includes an even number of driving patches 160 , and the auxiliary radiating portion includes a metasurface structure 250 corresponding to the even number of driving patches 160 . When the millimeter wave radar antenna 200 is working, since the feeding phases of the two driving patches 160 in one active unit 280 are opposite, the millimeter wave radar antenna 200 can provide beam scanning by the active unit 280 it includes.

In this embodiment, the number of driving patches 160 may be four; the number of active units 280 may be two, and the two active units 280 provide beam scanning for the millimeter-wave radar antenna 200 ; the metasurface structure 250 may be Including fifty-six mutually spaced metasurface patches 252, the metasurface patches 252 can be arranged on the second dielectric plate 130 in an 8×7 matrix, and fifty-six mutually spaced metasurface patches 252 The four driving patches 160 are evenly arranged, and the four driving patches 160 are evenly arranged in the center of the arrangement of the plurality of Metasurface patches 252, but this embodiment is not intended to limit the application, and can be implemented according to actual needs. Adjustment.

In one embodiment, each driving patch 160 includes a matching branch 164 ; the matching branches 164 of the feeding 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 differentially fed through the correspondingly connected feeding probes 170 (that is, the feeding phases of the two driving patches 160 differ by 180 degrees), the two driving patches 160 are powered differently. The radiation pattern synthesized after the sheet 160 is fed and excited has spatial symmetry.

In one embodiment, when the plurality of Metasurface patches 252 are arranged in a rectangular matrix, the center position may be, but not limited to, the location of the configuration area (ie, the rectangular area) of the plurality of Metasurface patches 252 . Diagonal intersection.

In one embodiment, when the shape of the patch body 162 is a rectangle and the patch body 162 and the plurality of Metasurface patches 252 are arranged in a rectangular matrix, the configuration area of the even-numbered driving patches 160 (ie, The diagonal intersection point of the rectangular area) may be directly opposite to the diagonal intersection point of the configuration area (ie, the rectangular area) of the plurality of metasurface patches 252, so as to ensure the radiation direction of the millimeter wave radar antenna 200 in the spatial distribution. The range is set symmetrically.

In one embodiment, the millimeter-wave radar antenna 200 further includes a coaxial joint 210 disposed on the surface of the metal base plate 110 away from the first dielectric plate 120 . The number of the coaxial joints 210 , the feeding probes 170 and the driving patches 160 is the same. , the coaxial joints 210 are connected to one end of the feeding probes 170 in a one-to-one correspondence, and are used to feed the connected driving patches 160 through the correspondingly connected feeding probes 170 .

Please refer to FIGS. 9 to 13 . FIG. 9 is a simulated graph of return loss of an embodiment of the millimeter-wave radar antenna of FIG. 7 , and FIG. 10 is a simulated graph of isolation of an embodiment of the millimeter-wave radar antenna of FIG. 7 . 11 is a radiation gain simulation curve diagram of an embodiment of the millimeter-wave radar antenna of FIG. 7 , FIG. 12 is a simulated radiation pattern of an embodiment of an active unit of the millimeter-wave radar antenna of FIG. 7 , and FIG. 13 is a millimeter wave radar antenna of FIG. 7 . An embodiment of another active element of a wave radar antenna simulates a radiation pattern. In the embodiments of FIGS. 9 to 13 , the metal base plate 110 , the metasurface 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 The material of the liquid crystal polymer can be LCP; the material of the cover plate 140 can be glass; the feeding probe 170 can be a coaxial probe; the dielectric constant (Dk) of the liquid crystal polymer can be 3.0, and the dielectric loss (Df) can be 0.002; the dielectric constant (Dk) of the glass may be 7.8, the dielectric loss (Df) may be 0.002; the dielectric constant (Dk) of the first adhesive layer 180 and the second adhesive layer 190 may be 4.0, The dielectric loss (Df) may be 0.02; the thickness of the first dielectric plate 120 may be, but not limited to, 0.1 mm; the thickness of the second dielectric plate 130 may be, but not limited to, 0.15 mm; the thickness of the cover plate 140 may be, but not limited to, 0.15 mm. Not limited to 0.55mm; the thickness of the first adhesive layer 180 and the second adhesive layer 190 may be but not limited to 0.06mm; the number of Metasurface patches 252 may be fifty-six, and the thickness of the 8×7 matrix Disposed on the second dielectric plate 130; the number of driving patches 160 can be four; the number of active units 280 can be two; the diagonal intersection of the configuration area of the driving patches 160 can be directly opposite to the The intersection of the diagonal lines of the arrangement regions of the plurality of Metasurface patches 252 .

In FIG. 9 , the dotted line is the simulation curve of the reflection coefficient S11 of the millimeter-wave radar antenna 200 changing with the working frequency, the dotted line is the simulation curve of the reflection coefficient S22 of the millimeter-wave radar antenna 200 changing with the working frequency, and the long dotted line is The simulation curve of the reflection coefficient S33 of the millimeter-wave radar antenna 200 changing with the working frequency, and the solid line is the simulation curve of the reflection coefficient S44 of the millimeter-wave radar antenna 200 changing with the working frequency. It can be seen from FIG. 9 that the bandwidth of the millimeter-wave radar antenna 200 not only includes the center operating frequency of 60.5 GHz, but also the bandwidth of less than -10 dB (about 56 to 68 GHz (19%)) can reach more than 10 GHz.

In FIG. 10 , the dotted line is the simulation curve of the isolation S21 of the millimeter-wave radar antenna 200 at different operating frequencies, the long dotted line is the simulation curve of the isolation S32 of the millimeter-wave radar antenna 200 under different operating frequencies, and the solid line It is the simulation curve of the isolation S43 of the millimeter-wave radar antenna 200 at different operating frequencies. It can be seen from FIG. 10 that the isolation degrees S21 , S32 , and S43 of the millimeter-wave radar antenna 200 can be below -15.00 dB, and have good isolation.

度且

度）上的增益保持在8dB以上。The curve in FIG. 11 is a simulation curve of the radiation gain of the millimeter-wave radar antenna 200 as a function of the operating frequency. It can be seen from FIG. 11 that the operating frequency bandwidth of the millimeter-wave radar antenna 200 (ie, 58 to 63 GHz) is in the main radiation direction (ie, 58 to 63 GHz).

degree and

degrees) to keep the gain above 8dB.

In FIG. 12 , the dotted line is the gain simulation curve of one active unit 280 of the millimeter-wave radar antenna 200 with an operating frequency of 60.5GHz in different radiation directions on the E-plane, and the solid line is the millimeter-wave radar antenna with an operating frequency of 60.5GHz. The gain simulation curves of one active unit 280 of 200 in different radiation directions on the H surface; in FIG. 13, the dotted line is the E surface of another active unit 280 of the millimeter-wave radar antenna 200 with an operating frequency of 60.5GHz. The gain simulation curves of different radiation directions, the solid line is the gain simulation curve of another active element 280 of the millimeter-wave radar antenna 200 with an operating frequency of 60.5 GHz in different radiation directions on the H plane. It can be seen from FIG. 12 and FIG. 13 that one active unit 280 and another active unit 280 of the millimeter-wave radar antenna 200 have the characteristics of wide beam and low gain fluctuation, and the gain in the radiation direction range from -60 degrees to 60 degrees is greater than -3dB, which effectively solves the serious problems such as impedance mismatch and pattern distortion of the antenna due to the limitation of physical space when the current AiP technology is applied to the antenna.

In addition, it can be seen from FIG. 12 and FIG. 13 that when one active unit 280 and another active unit 280 of the millimeter-wave radar antenna 200 are excited at the same time, due to the introduction of the reverse-phase feeding technology, under the excitation of a given phase difference, the two The array pattern synthesized by the active units 280 is consistent on the two main planes in space, which can ensure the equalization of the received strength of echo signals in all directions by the millimeter-wave radar antenna 200 .

Please refer to FIGS. 13 and 14. FIG. 13 is a block diagram of an electronic device having the millimeter-wave radar antenna of the present application, and FIG. 14 is a block diagram of another embodiment of the electronic device having the millimeter-wave radar antenna of the present application. . As shown in FIGS. 13 and 14 , the electronic device 300 includes the millimeter-wave radar antenna 100 , and the electronic device 400 includes the millimeter-wave radar antenna 200 . The electronic device 300 and the electronic device 400 may include, for example, a smart phone, a personal computer (PC), a mobile phone, a video phone, an e-book reader, a notebook computer (Laptop), a workstation, a server, and a personal digital assistant (PDA). , at least one of a portable media player (PMP), an MPEG-1 audio layer-3 (MP3) player, a mobile phone medical device, a camera, and a wearable device.

To sum up, the millimeter-wave radar antenna and electronic device of the embodiments of the present application introduce a metasurface structure with a reactive impedance surface (RIS) through the metasurface loading technology, so that when the millimeter-wave radar antenna The probe feeds the drive patch to excite the drive patch to generate the first resonance, and the metasurface structure generates the second resonance through the tight coupling with the drive patch. Therefore, the first resonance generated by the drive patch is different from the metasurface. The second resonance generated by the surface structure works together to solve the serious problems of the antenna in the current AiP technology, such as impedance mismatch and pattern distortion of the antenna due to the limitation of physical space. In addition, the millimeter-wave radar antenna is designed through seamless stacking of multi-layer materials, which has good sealing and stability, and ensures the normal operation of the radar identification module and electronic device using the millimeter-wave radar antenna in terms of identification function.

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

Although the present invention is described using the above embodiments, it should be noted that these descriptions are not intended to limit the present invention. On the contrary, this invention covers modifications and similar arrangements obvious to those skilled in the art. Therefore, the scope of the patent application is to be construed in the broadest possible manner to encompass all obvious modifications and similar arrangements.

100,200: mmWave radar antenna 110: Metal bottom plate 112: Hole 120: First Dielectric Plate 122: Feed through hole 130: Second Dielectric Plate 140: Cover 150,250: Metasurface Structure 152,252: Metasurface Patch 160: Driver patch 162: Patch body 164: match branch 170: Feed Probe 180: The first adhesive layer 190: Second adhesive layer 210: coaxial connector 280: Active unit 300,400: Electronic devices

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The exemplary embodiments and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the schema: 1 is an exploded view of an embodiment of a millimeter-wave radar antenna according to the present application; FIG. 2 is a combination diagram of an embodiment of the millimeter-wave radar antenna of FIG. 1; 3 is a cross-sectional view of an embodiment of the millimeter-wave radar antenna of FIG. 1; FIG. 4 is a simulation graph of return loss of an embodiment of the millimeter-wave radar antenna of FIG. 1; FIG. 5 is a radiation gain simulation curve diagram of an embodiment of the millimeter-wave radar antenna of FIG. 1; 6 is a simulated radiation pattern of an embodiment of the millimeter-wave radar antenna of FIG. 1; 7 is an exploded view of another embodiment of the millimeter wave radar antenna according to the present application; FIG. 8 is a cross-sectional view of an embodiment of the millimeter-wave radar antenna of FIG. 7; FIG. 9 is a simulation graph of return loss of an embodiment of the millimeter-wave radar antenna of FIG. 7; FIG. 10 is a simulation graph of isolation degree of an embodiment of the millimeter-wave radar antenna of FIG. 7; FIG. 11 is a radiation gain simulation curve diagram of an embodiment of the millimeter-wave radar antenna of FIG. 7; 12 is a simulated radiation pattern of an embodiment of an active unit of the millimeter-wave radar antenna of FIG. 7; FIG. 13 is a simulated radiation pattern of another active unit of the millimeter-wave radar antenna of FIG. 7 according to an embodiment; 14 is a block diagram of an embodiment of an electronic device having the millimeter-wave radar antenna of the present application; and FIG. 15 is a block diagram of another embodiment of an electronic device having the millimeter-wave radar antenna of the present application.

100: mmWave radar antenna

110: Metal bottom plate

112: Hole

120: First Dielectric Plate

130: Second Dielectric Plate

140: Cover

150: Metasurface Structure

152: Metasurface Patch

160: Driver patch

162: Patch body

164: match branch

170: Feed Probe

180: The first adhesive layer

190: Second adhesive layer

210: coaxial connector

Claims (9)

A millimeter wave radar antenna, comprising: a metal base plate; a first dielectric plate arranged on the metal base plate; a second dielectric plate arranged on the first dielectric plate; a cover plate arranged on the the second dielectric plate; a metasurface structure disposed on the surface of the second dielectric plate facing the cover plate, and comprising a plurality of mutually spaced metasurface patches; a driving patch disposed on The first dielectric plate faces the surface of the second dielectric plate, and is disposed at a center position corresponding to the arrangement of the Metasurface patches; and a feeding probe penetrates through the metal base plate and the first A dielectric plate is connected to the driver patch for feeding the driver patch, so that the driver patch generates a first resonance, and the metasurface structure generates a Second resonance. The millimeter-wave radar antenna of claim 1, wherein the driving patch comprises a patch body and a matching branch; the matching branch is connected to the feeding probe and is used to realize the impedance of the millimeter-wave radar antenna match. The millimeter-wave radar antenna according to claim 2, wherein the matching branch and/or the patch body has a rectangular shape. The millimeter-wave radar antenna of claim 1, further comprising a first adhesive layer and a second adhesive layer, the first dielectric plate passing through the first adhesive layer and the second dielectric plate bonding, the second dielectric board is bonded with the cover board through the second adhesive layer. The millimeter-wave radar antenna of claim 1, wherein the first dielectric plate and the second dielectric plate are made of liquid crystal polymer. The millimeter-wave radar antenna of claim 1, wherein the metasurface patches are arranged in a rectangular matrix. The millimeter-wave radar antenna of claim 1, wherein the number of the driving patches is an even number, every two symmetrically arranged driving patches form an active unit, and the metasurface patches evenly correspond to an even number Each of the driving patches is arranged; the number of the feeding probes is the same as the number of the driving patches, the feeding probes are connected to the driving patches in a one-to-one correspondence, and two of the drivers in the one active unit The patch is differentially fed through the correspondingly connected feed probes to provide beam scanning. The millimeter-wave radar antenna of claim 7, wherein each of the driving patches includes a matching branch; in the one active unit, the two driving patches are respectively connected to the feeding probes. The matching branch is 130. set up. An electronic device comprising: the millimeter wave radar antenna according to any one of claims 1 to 8.

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