UWB antenna and smart screen

Abstract

The present application discloses a UWB antenna and a smart screen, which relate to the field of wireless communication technology. The UWB antenna includes a first substrate, a second substrate, a grounding body and at least two radiating units. The first substrate is stacked with the second substrate, and each radiating unit is arranged at intervals. Each radiating unit includes a radiator and a metamaterial structure. The first substrate has a first surface and a second surface that are arranged opposite to each other. The grounding body is arranged on the first surface, and the radiator is arranged on the second surface. The radiator is electrically connected to the grounding body. The radiator is provided with a feeding port, and the radiator faces the second substrate. The metamaterial structure is arranged on the side of the second substrate away from the first substrate. The radiator and the metamaterial structure are coupled to each other, and in the direction perpendicular to the first substrate, the orthographic projection of the metamaterial structure and the orthographic projection of the radiator at least partially overlap. This solution can solve the problem of the current small beam width of the UWB antenna.

Description

Technical Field

[0001] The present application belongs to the field of wireless communication technology, and specifically relates to a UWB antenna and a smart screen. Background Art

[0002] UWB (Ultra Wide Band) is a wireless carrier communication technology that uses broadband pulse communication technology and has strong anti-interference capabilities, which greatly reduces positioning errors and achieves centimeter-level positioning accuracy. It is mainly used for real-time tracking and positioning of indoor people and objects, and is widely used in smart factories, unmanned exhibitions and vending systems, modern warehousing and logistics, intelligent navigation in buildings and other fields.

[0003] In recent years, with the development of radar technology, UWB technology has gradually begun to be applied to radar detection, forming UWB radar, which can be specifically applied to products such as smart screens and driverless cars. It uses antennas to transmit electromagnetic waves and obtains information such as the relative distance, speed, and angle between the radar body and the detection target by processing echo signals. At present, the antennas of common UWB radars are mostly in the form of metal parasitic patches on the same layer. Metal parasitic patches and metal through-holes are added near the main radiation patch to generate induced currents to achieve wide beams. However, in actual applications, the beam width obtained by the above method is still relatively limited, and it basically remains at around 100°, which cannot meet the use requirements of some application scenarios of UWB radars. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a UWB antenna and a smart screen that can solve the problem of the current small beam width of the UWB antenna.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a UWB antenna, comprising a first substrate, a second substrate, a ground body, and at least two radiating units, wherein the first substrate is stacked with the second substrate, and the radiating units are arranged at intervals.

[0007] Each of the radiation units includes a radiator and a metamaterial structure. The first substrate has a first surface and a second surface arranged opposite to each other. The grounding body is arranged on the first surface, and the radiator is arranged on the second surface. The radiator is electrically connected to the grounding body. The radiator is provided with a feeding port. The radiator faces the second substrate. The metamaterial structure is arranged on a side of the second substrate facing away from the first substrate. The radiator and the metamaterial structure are coupled to each other. In a direction perpendicular to the first substrate, the orthographic projection of the metamaterial structure at least partially overlaps with the orthographic projection of the radiator.

[0008] In the second aspect, an embodiment of the present application also provides a smart screen, including a middle frame, a display module and a UWB radar, wherein the middle frame is arranged around the display module, the UWB radar is arranged in the middle frame, and the UWB radar includes the above-mentioned UWB antenna.

[0009] In the embodiment of the present application, the first substrate and the second substrate are stacked, and each radiation unit is arranged in sequence and spaced apart. Each radiation unit includes a radiator and a metamaterial structure. The radiator is arranged on a side of the first substrate facing the second substrate, and the radiator is provided with a feeding port. The metamaterial structure is arranged on a side of the second substrate facing away from the first substrate. The radiator and the metamaterial structure are coupled to each other, and in a direction perpendicular to the first substrate, the orthographic projection of the metamaterial structure and the orthographic projection of the radiator at least partially overlap. When the radiator feeds an electrical signal through the feeding port, the electromagnetic energy radiated by the radiator is coupled to the metamaterial structure, so that a coupling current is generated inside the metamaterial structure. At this time, the metamaterial structure also radiates electromagnetic energy. Since the second substrate is located between the metamaterial structure and the radiator, the two are spaced apart, which can avoid the metamaterial structure and the radiator from affecting each other's electromagnetic energy, thereby enhancing the superposition effect of the radiation field generated by the two, and then widening the beam width of the UWB antenna; at the same time, the combination between the radiator and the metamaterial structure generates a new high-order resonance mode, which is conducive to further widening the beam width of the UWB antenna. Therefore, this solution can solve the problem of small beam width of current UWB antennas. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 to Figure 2 It is a schematic diagram of the structure of the UWB antenna disclosed in the embodiment of the present application at different viewing angles;

[0011] Figure 3 A schematic diagram of the structure of the second substrate and the metamaterial structure disclosed in the embodiment of the present application;

[0012] Figure 4 A schematic diagram of the structure of the first substrate and the radiator disclosed in the embodiment of the present application;

[0013] Figure 5 A schematic diagram of the structure of the grounding body disclosed in the embodiment of the present application;

[0014] Figure 6 This is a schematic diagram of the structure of the smart screen disclosed in the embodiment of this application;

[0015] Figure 7 This is a schematic diagram of the structure of a smart screen disclosed in another embodiment of the present application;

[0016] Figure 8 A return loss curve diagram of the radiation unit disclosed in the embodiment of the present application;

[0017] Fig. 9 A diagram showing a change in the horizontal beam width of a radiation unit disclosed in an embodiment of the present application;

[0018] Fig.10 A diagram showing a change in the vertical beam width of a radiation unit disclosed in an embodiment of the present application;

[0019] Fig.11 It is a return loss curve diagram of the UWB antenna disclosed in the embodiment of the present application, wherein the solid line is the return loss curve diagram of the first radiation unit, and the dotted line is the return loss curve diagram of the second radiation unit;

[0020] Fig.12 A diagram showing a change in the horizontal beam width of the UWB antenna disclosed in an embodiment of the present application;

[0021] Fig.13 A diagram showing a change in the vertical beam width of the UWB antenna disclosed in an embodiment of the present application;

[0022] Fig.14 A diagram showing a change in isolation between a first radiation unit and a second radiation unit of a UWB antenna disclosed in an embodiment of the present application;

[0023] in, Figure 8 , Fig.11 and Fig.14 The horizontal axis represents the frequency, and the vertical axis represents the return loss value. Fig. 9 , Fig.10 , Fig.12 and Fig.13 The horizontal axis represents the Theta angle, and the vertical axis represents the gain value.

[0024] Description of reference numerals:

[0025] 100 - first substrate, 110 - first surface, 120 - second surface;

[0026] 200- a second substrate;

[0027] 300- grounding body;

[0028] 400-radiating unit, 400'-first radiating unit, 400"-second radiating unit, 410-radiator, 411-radiating patch, 411a-radiating body, 411b microstrip line, 412-parasitic patch, 420-metamaterial structure, 421-metamaterial unit, 421'-first metamaterial unit, 421"-second metamaterial unit;

[0029] 500-Metal connectors;

[0030] 610-middle frame, 620-display module, 630-UWB radar, 631-UWB antenna. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0033] The UWB antenna and smart screen provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0034] like Figures 1 to 5 As shown, the embodiment of the present application discloses a UWB antenna, which is applied to a smart screen. The UWB antenna is used to locate people or objects around the smart screen in real time to obtain information such as the relative distance, speed, angle, etc. between the smart screen and the detection target, thereby better realizing the human-computer interaction performance of the smart screen. Of course, the UWB antenna can also be used in structures such as self-driving cars, and the embodiment of the present application does not make specific restrictions on this.

[0035] The UWB antenna includes a first substrate 100, a second substrate 200, a grounding body 300 and at least two radiation units 400. The first substrate 100 is stacked with the second substrate 200. Optionally, at least one of the first substrate 100 and the second substrate 200 can be made of S7136H PCB board material, and of course can also be made of other structures. The embodiment of the present application does not impose any specific limitation on this.

[0036] Each radiation unit 400 is arranged at intervals, and each radiation unit 400 includes a radiator 410 and a metamaterial structure 420. The first substrate 100 has a first surface 110 and a second surface 120 that are arranged opposite to each other. The grounding body 300 is arranged on the first surface 110. The radiator 410 is provided with a feeding port, and the feeding port is electrically connected to the feed source. The feed source transmits the electrical signal to the inside of the radiator 410 through the feeding port. Optionally, the grounding body 300 can be a metal structure, specifically a metal patch, or a metal film layer, which is not specifically limited here. The radiator 410 is arranged on the second surface 120, and the radiator 410 is electrically connected to the grounding body 300. Optionally, the radiator 410 includes a radiating body and a coaxial line, and the coaxial line includes a core and a grounding layer arranged at intervals, and the grounding layer is wrapped outside the core. One end of the core is electrically connected to the radiating body, and the other end of the core is provided with a feeding port; the radiating body is electrically connected to the grounding body 300 through the grounding layer.

[0037] The radiator 410 faces the second substrate 200. Optionally, the radiator 410 can be connected between the first substrate 100 and the second substrate 200, or the first substrate 100 and the second substrate 200 are connected by a connecting member. At this time, the radiator 410 and the second substrate 200 can only be in contact with each other, or they can be arranged at intervals. The embodiment of the present application does not impose any specific restrictions on this.

[0038] The metamaterial structure 420 is disposed on a side of the second substrate 200 facing away from the first substrate 100, the radiator 410 and the metamaterial structure 420 are coupled to each other, and in a direction perpendicular to the first substrate 100, the orthographic projection of the metamaterial structure 420 at least partially overlaps with the orthographic projection of the radiator 410. Optionally, a side of the grounding body 300 facing the first substrate 100 can be used as a reflection surface, so as to reflect the electromagnetic waves directed to the side where the grounding body 300 is located to the side where the second substrate 200 is located, that is, the UWB antenna disclosed in the present application can be a directional antenna, and the electromagnetic waves radiated by the radiating unit 400 are all radiated toward the side of the first substrate 100 facing away from the grounding body 300.

[0039] In the embodiment of the present application, when the radiator 410 feeds an electrical signal through the feeding port, the electromagnetic energy radiated by the radiator 410 is coupled to the metamaterial structure 420, so that a coupling current is generated inside the metamaterial structure 420. At this time, the metamaterial structure 420 also radiates electromagnetic energy. Since the second substrate 200 is located between the metamaterial structure 420 and the radiator 410, the two are separated, which can avoid the metamaterial structure 420 and the radiator 410 from affecting each other's electromagnetic energy, thereby enhancing the superposition effect of the radiation field generated by the two, and then widening the beam width of the UWB antenna; at the same time, the combination between the radiator 410 and the metamaterial structure 420 generates a new high-order resonance mode, which is conducive to further widening the beam width of the UWB antenna. Therefore, this solution can solve the problem of the current small beam width of the UWB antenna.

[0040] In an optional embodiment, at least two radiation units 400 include a first radiation unit 400' and a second radiation unit 400", and the radiator 410 can be an integrated structure; or, the extension direction of the first radiation unit 400' to the second radiation unit 400" is the first direction, and the radiator 410 includes a radiation patch 411 and a parasitic patch 412 arranged at intervals along the first direction, the radiation patch 411 is provided with a feeding port, and a coupling gap is provided between the radiation patch 411 and the parasitic patch 412, and the radiation patch 411 and the parasitic patch 412 are both coupled to the metamaterial structure 420. In a direction perpendicular to the first substrate 100, the orthographic projection of the radiation patch 411 coincides with the first part of the orthographic projection of the metamaterial structure 420, and the orthographic projection of the parasitic patch 412 coincides with the second part of the orthographic projection of the metamaterial structure 420. At this time, the coupling performance between the radiation patch 411 and the metamaterial structure 420 and between the parasitic patch 412 and the metamaterial structure 420 is good.

[0041] Specifically, when an electrical signal is fed into the feeding port of the radiation patch 411, a coupling effect occurs between the radiation patch 411 and the parasitic patch 412, and the electromagnetic energy on the radiation patch 411 is transmitted to the parasitic patch 412 by electromagnetic coupling, so that a coupling current is generated inside the parasitic patch 412 to generate a new high-order resonance mode; at the same time, the radiation patch 411 and the parasitic patch 412 are mutually coupled with the metamaterial structure 420 to generate another new high-order resonance mode. At this time, there are multiple resonance modes inside the radiation unit 400, which is conducive to further broadening the beam width of the UWB antenna, and can also broaden the bandwidth of the UWB antenna.

[0042] Optionally, the radiation patch 411 includes a connected radiation body 411a and a microstrip line 411b, the microstrip line 411b is provided with a feeding port, a coupling gap is provided between the radiation body 411a and the parasitic patch 412, the radiation body 411a and the parasitic patch 412 are mutually coupled with the metamaterial structure 420, and in a direction perpendicular to the first substrate 100, the orthographic projection of the radiation body 411a coincides with the first part of the orthographic projection of the metamaterial structure 420. This solution uses the microstrip line 411b to transmit electrical signals, which has the characteristics of wide bandwidth, high reliability, etc.

[0043] In the process of manufacturing the UWB antenna, the length and width of the microstrip line 411b can be set according to the thickness, dielectric constant and other parameters of the first substrate 100 so that the microstrip line 411b meets the 50 ohm impedance matching characteristics. At this time, there is no need to set other additional impedance transformers, which is conducive to reducing the link loss of the microstrip line 411b.

[0044] In a further optional embodiment, the metamaterial structure 420 includes at least two metamaterial units 421 spaced apart along a first direction, including a first metamaterial unit 421′ and a second metamaterial unit 421″. In a direction perpendicular to the first substrate 100, the first metamaterial unit 421′ may be directly opposite to the radiation patch 411, and the second metamaterial unit 421″ may be directly opposite to the parasitic patch 412. In this case, the radiation patch 411 is coupled to the first metamaterial unit 421′, and the parasitic patch 412 is coupled to the second metamaterial unit 421″. Alternatively, the first metamaterial unit 421′ is coupled to a first portion of the radiation patch 411, and in a direction perpendicular to the first substrate 100, the orthographic projection of the first metamaterial unit 421′ is located on the radiation patch 411. The first metamaterial unit 421' is within the orthographic projection of the radiation patch 411, and the central axis of the first metamaterial unit 421' coincides with the central axis of the radiation patch 411. At this time, the coupling performance between the first metamaterial unit 421' and the radiation patch 411 is good; the second metamaterial unit 421" is coupled with the second part of the radiation patch 411 and the parasitic patch 412 respectively. In the direction perpendicular to the first substrate 100, the first part of the orthographic projection of the second metamaterial unit 421" coincides with the orthographic projection of the radiation patch 411, and the second part of the orthographic projection of the second metamaterial unit 421" coincides with the orthographic projection of the parasitic patch 412. At this time, the coupling performance between the second metamaterial unit 421" and the radiation patch 411 and between the second metamaterial unit 421" and the parasitic patch 412 are both good.

[0045] Specifically, when an electrical signal is fed into the feeding port of the radiation patch 411, a coupling effect occurs between the radiation patch 411 and the parasitic patch 412, and the electromagnetic energy on the radiation patch 411 is transmitted to the parasitic patch 412 by means of electromagnetic coupling, so that a coupling current is generated inside the parasitic patch 412, thereby generating a new high-order resonance mode; at the same time, a coupling effect occurs between the radiation patch 411 and the first metamaterial unit 421', and the electromagnetic energy on the radiation patch 411 is transmitted to the first metamaterial unit 421' by means of electromagnetic coupling, so that a coupling current is generated inside the first metamaterial unit 421', thereby generating another new high-order resonance mode; and A coupling effect occurs between the two metamaterial units 421″ and between the parasitic patch 412 and the second metamaterial unit 421″. The electromagnetic energy on the radiation patch 411 and the parasitic patch 412 are transmitted to the second metamaterial unit 421″ by electromagnetic coupling, so that a coupling current is generated inside the second metamaterial unit 421″, thereby generating another new high-order resonance mode. At this time, there are more resonance modes inside the radiation unit 400, which is conducive to further widening the beam width of the UWB antenna, and can also further widen the bandwidth of the UWB antenna; in addition, with this setting, the link loss inside each radiation unit 400 is small, which is conducive to improving the radiation performance of the UWB antenna.

[0046] In an optional embodiment, the number of the second metamaterial unit 421" may be one; or, the number of the second metamaterial unit 421" is at least two, and the parasitic patch 412 is arranged in a one-to-one correspondence with the second metamaterial unit 421". By providing a plurality of second metamaterial units 421" and a plurality of parasitic patches 412, more resonant modes are introduced inside the radiation unit 400, thereby further broadening the beam width and bandwidth of the UWB antenna.

[0047] Optionally, each second metamaterial unit 421" can be set on one side of the first metamaterial unit 421'; or, each second metamaterial unit 421" is evenly arranged on the opposite sides of the first metamaterial unit 421' along the first direction, so that the electromagnetic wave radiated by the radiation unit 400 is more evenly distributed and the symmetry of its radiation pattern is better; in addition, when a coupled feeding method is adopted between the radiation patch 411 and the parasitic patch 412, and the number of parasitic patches 412 is multiple, there is no need to set up a precise feeding network and a power divider to make each parasitic patch 412 work to the same resonant state, which is conducive to shortening the debugging cycle of the UWB antenna and can reduce the processing accuracy of the radiator 410.

[0048] Optionally, the sizes of the metamaterial units 421 may be equal; or, in other optional embodiments, the size of the second metamaterial unit 421″ in the second direction is smaller than the size of the first metamaterial unit 421′ in the second direction, wherein the second direction is perpendicular to the first direction, and the second direction is perpendicular to the thickness direction of the first substrate 100, that is, the second direction is Figure 3 The second metamaterial unit 421' is in the width direction of the second substrate 200. This solution reduces the size of the second metamaterial unit 421' so that the second metamaterial unit 421' guides the electromagnetic waves radiated by the first metamaterial unit 421' to be distributed more along the first direction, so as to further widen the beam width of the radiation unit 400, that is, the second metamaterial unit 421' in this solution can play the role of a director.

[0049] Optionally, each metamaterial unit 421 can be a circular patch, a triangular patch, a rectangular patch, etc., and the embodiments of the present application do not impose specific restrictions on this; further optionally, each metamaterial unit 421 is a rectangular patch, and the size of the rectangular patch is larger in a limited space, which is beneficial to improving the radiation performance of the antenna.

[0050] Optionally, the size of the parasitic patch 412 in the second direction can be smaller than the size of the radiation patch 411 in the second direction, wherein the second direction is perpendicular to the first direction, and the second direction is perpendicular to the thickness direction of the first substrate 100; or, the size of the parasitic patch 412 in the second direction is greater than or equal to the size of the radiation patch 411 in the second direction. In this case, the area directly facing the parasitic patch 412 and the radiation patch 411 is larger, and correspondingly the coupling performance between the two is also better, which is beneficial to improving the radiation performance of the UWB antenna. On the basis of achieving the same radiation performance, the size of the radiation unit 400 can be reduced.

[0051] It should be noted that the size of the parasitic patch 412 in the first direction can be selected according to actual needs, and the embodiment of the present application does not impose any specific limitation on this.

[0052] In another optional embodiment, the number of parasitic patches 412 is one; or, the number of parasitic patches 412 is at least two, in which case each parasitic patch 412 is coupled with the metamaterial structure 420, which is conducive to improving the radiation performance of the radiation unit 400. Optionally, in the first direction, each parasitic patch 412 can be arranged on one side of the radiation patch 411, or each parasitic patch 412 is evenly arranged on two opposite sides of the radiation patch 411 along the first direction, so that the electromagnetic waves radiated by the radiation unit 400 are more evenly distributed, thereby improving the symmetry of the radiation pattern of the radiation unit 400.

[0053] In another optional embodiment, at least two radiation units 400 include a first radiation unit 400' and a second radiation unit 400", wherein the first radiation unit 400' is a transmitter for emitting electromagnetic waves to the outside, and the second radiation unit 400" is a receiver for receiving electromagnetic waves from the outside. The UWB antenna also includes a metal connector 500, and the first substrate 100 and the second substrate 200 are connected via the metal connector 500 to make the connection between the first substrate 100 and the second substrate 200 more secure. Of course, the first substrate 100 and the second substrate 200 can also be electrically connected via a metal through hole.

[0054] Optionally, the metal connector 500 can be arranged arbitrarily; or, the metal connector 500 is located between the first radiation unit 400' and the second radiation unit 400", and the metal connector 500 is located in the middle area of ​​the first substrate 100, which is conducive to improving the connection stability between the first substrate 100 and the second substrate 200, and the metal connector 500 can increase the isolation between the emitter and the receiver, thereby improving the emission performance of the emitter and the receiving performance of the receiver; in addition, when the metal connector 500 is used to connect the first substrate 100 and the second substrate 200, there is no need to set metal through holes on the first substrate 100 and the second substrate 200. At this time, the first substrate 100 and the second substrate 200 can be processed separately, which has low requirements on the processing technology and is conducive to reducing the processing difficulty.

[0055] Optionally, the thickness of the first substrate 100 can be 0.8 mm. When the UWB antenna is integrated with the processor, the thickness of the first substrate 100 is relatively small, which can avoid warping and other phenomena; the thickness of the second substrate 200 can be 3.2 mm. Of course, the thickness of the first substrate 100 and the thickness of the second substrate 200 can also be selected according to actual needs, and the embodiment of the present application does not impose any specific restrictions on this.

[0056] Optionally, the operating frequency band of the UWB antenna is 7.8~8.5GHz. Of course, it can also be selected according to actual working needs. The embodiments of the present application do not impose specific restrictions on this. The beam width of the UWB antenna is 140~190°. Specifically, it is measured by 3dB beam width, that is, when the antenna peak gain is reduced by 3dB, the beam width can reach 140°, and it is measured by 6dB beam width, that is, when the antenna peak gain is reduced by 6dB, the beam width can reach 190°. It should be noted that the beam width of 140~190° here specifically means that when the UWB antenna is placed horizontally, the horizontal plane beam width of the electromagnetic waves radiated by it is 140~190°; the beam width angles here are all approximate values.

[0057] refer to Figure 8According to the return loss curve of the radiation unit of the UWB antenna, the return loss of the UWB antenna in the range of 7.8~8.6GHz is less than -10dB.

[0058] refer to Fig. 9 According to the horizontal plane beam width variation diagram of the radiation unit of the UWB antenna, the beam width at 3dB in the horizontal plane is greater than 130°, and the beam width at 6dB in the horizontal plane is greater than 160°.

[0059] refer to Fig.10 According to the vertical beam width variation diagram of the radiation unit of the UWB antenna, the beam width at 3dB in the vertical plane is greater than 70°, and the beam width at 6dB in the vertical plane is greater than 90°.

[0060] This indicates that the gain of the radiation unit of the UWB antenna is above 3.5 dB, and it has good wide-beam radiation performance.

[0061] refer to Fig.11 ,According to the return loss curve of the UWB antenna, the return loss of the UWB antenna is less than -10dB in the range of 7.8~8.5GHz.

[0062] refer to Fig.12 ,According to the horizontal plane beam width variation diagram of the UWB antenna, ,the beam width at 3dB in the horizontal plane is greater than 140°, ,and the beam width at 6dB in the horizontal plane is greater than 190°.

[0063] refer to Fig.13 According to the vertical beam width variation diagram of the UWB antenna, the beam width at 3dB in the vertical plane is greater than 70°, and the beam width at 6dB in the vertical plane is greater than 85°.

[0064] refer to Fig.14 According to the isolation variation diagram between the first radiation unit and the second radiation unit of the UWB antenna, the isolation in the working frequency band of 7.8~8.5GHz is greater than -32dB.

[0065] This shows that the gain of the UWB antenna in its operating frequency band is more than 3.5dB, achieving wide-beam radiation.

[0066] like Figure 6 to Figure 7As shown, based on the UWB antenna disclosed in the embodiment of the present application, the embodiment of the present application also provides a smart screen, which includes a middle frame 610, a display module 620 and a UWB radar 630. The middle frame 610 is arranged around the display module 620, and the UWB radar 630 is arranged in the middle frame 610. The UWB radar 630 includes the UWB antenna 631 described in any of the above embodiments. Of course, the UWB radar 630 can also be applied to other wireless communication devices, such as autonomous driving, security and health care industries, and the embodiment of the present application does not make specific restrictions on this.

[0067] In an optional embodiment, the UWB radar 630 is disposed between the middle frame 610 and the display module 620, and a strip-shaped accommodation space is formed between the first side wall of the middle frame 610 and the first edge of the display module 620, and the UWB antenna 631 is disposed in the strip-shaped accommodation space. This solution uses the accommodation space between the display module 620 and the middle frame 610 to set the UWB radar 630, thereby avoiding it from occupying additional space in the smart screen, making the structure of the entire smart screen more compact, and at the same time improving the aesthetics of the smart screen. Optionally, the UWB radar 630 can be disposed below the display module 620. In this case, the UWB radar 630 is disposed at a lower position, which can reduce the detection blind area of ​​the UWB radar 630 and make its detection more comprehensive. Of course, the UWB radar 630 can also be disposed above the display module 620, or arranged side by side with the display module 620 in a horizontal plane.

[0068] In other optional embodiments, a mounting groove is provided on one side of the middle frame 610 facing away from the display module 620, and part of the UWB radar 630 is arranged in the mounting groove, that is, the UWB radar 630 is arranged on the outside of the middle frame 610, and the UWB antenna 631 is located outside the mounting groove. At this time, the shape of the UWB antenna 631 can be set arbitrarily, and its design is more flexible; at the same time, adopting this setting method can avoid being blocked by the glass cover plate and other structures of the smart screen, which is conducive to improving the radiation performance of the UWB antenna. Optionally, the UWB radar 630 can be set above the middle frame 610, which can avoid being hit, thereby improving the safety of the UWB radar 630. Of course, the UWB radar 630 can also be set below the middle frame 610, or arranged side by side with the middle frame in a horizontal plane.

[0069] In an optional embodiment, at least two radiation units 400 include a first radiation unit 400' and a second radiation unit 400", the extension direction of the first radiation unit 400' to the second radiation unit 400" is a first direction, the first direction is parallel to the length direction of the strip-shaped accommodating space, the radiator 410 includes a radiation patch 411 and a parasitic patch 412 arranged at intervals along the first direction, the radiation patch 411 is provided with a feeding port, and a coupling gap is provided between the radiation patch 411 and the parasitic patch 412, the radiation patch 411 and the parasitic patch 412 are both coupled to the metamaterial structure 420, when the UWB antenna 631 is arranged in the strip-shaped accommodating space between the middle frame 610 and the display module 620, the size of the radiation patch 411 in the first direction is greater than the size of the radiation patch 411 in the second direction, that is, the radiation patch 411 is a strip structure, wherein the second direction is perpendicular to the first direction, and the second direction is perpendicular to the thickness direction of the first substrate 100. By setting the radiation patch 411 to a strip structure, it is easy to adapt to the black edge of the smart screen, and the beam width of the UWB antenna can be further widened. This solution uses the UWB antenna to locate people or objects around the smart screen in real time, that is, the electromagnetic waves emitted by the UWB antenna are processed by the echo signal to obtain the relative distance, speed, angle and other information between the smart screen and the detection target, so as to better realize the human-computer interaction performance of the smart screen. Therefore, this solution can ensure that the smart screen has a large effective display area and has good human-computer interaction performance.

[0070] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A UWB antenna, applied to a smart screen, characterized in that: The invention comprises a first substrate (100), a second substrate (200), a grounding body (300) and at least two radiation units (400), wherein the first substrate (100) and the second substrate (200) are stacked, and the radiation units (400) are arranged at intervals. Each of the radiation units (400) comprises a radiator (410) and a metamaterial structure (420); the first substrate (100) comprises a first surface (110) and a second surface (120) disposed opposite to each other; the grounding body (300) is disposed on the first surface (110); the radiator (410) is disposed on the second surface (120); the radiator (410) is electrically connected to the grounding body (300); the radiator (410) is provided with a feeding port; the radiator (410) faces the second substrate (200); and the metamaterial structure (420) is disposed on a surface of the second substrate (200) that faces away from the first substrate (100); The at least two radiation units (400) include a first radiation unit (400') and a second radiation unit (400"), the extension direction of the first radiation unit (400') toward the second radiation unit (400") being a first direction, the radiator (410) including a radiation patch (411) and a parasitic patch (412) arranged at intervals along the first direction, the radiation patch (411) being provided with the feeding port, a coupling gap being provided between the radiation patch (411) and the parasitic patch (412), the radiation patch (411) and the parasitic patch (412) being coupled to the metamaterial structure (420), and in a direction perpendicular to the first substrate (100), the orthographic projection of the radiation patch (411) coincides with a first part of the orthographic projection of the metamaterial structure (420), and the orthographic projection of the parasitic patch (412) coincides with a second part of the orthographic projection of the metamaterial structure (420).

2. The UWB antenna according to claim 1, characterized in that: The metamaterial structure (420) comprises at least two metamaterial units (421) spaced apart along the first direction, including a first metamaterial unit (421') and a second metamaterial unit (421"), The first metamaterial unit (421') is coupled to a first portion of the radiation patch (411), and in a direction perpendicular to the first substrate (100), an orthographic projection of the first metamaterial unit (421') is located within an orthographic projection of the radiation patch (411), and a central axis of the first metamaterial unit (421') coincides with a central axis of the radiation patch (411); The second metamaterial unit (421") is coupled to the second part of the radiation patch (411) and the parasitic patch (412) respectively; in a direction perpendicular to the first substrate (100), a first part of the orthographic projection of the second metamaterial unit (421") coincides with the orthographic projection of the radiation patch (411), and a second part of the orthographic projection of the second metamaterial unit (421") coincides with the orthographic projection of the parasitic patch (412).

3. The UWB antenna according to claim 2, characterized in that: The number of the second metamaterial units (421") is at least two, and each of the second metamaterial units (421") is evenly arranged on two opposite sides of the first metamaterial unit (421') along the first direction, and the parasitic patches (412) are arranged in a one-to-one correspondence with the second metamaterial units (421").

4. The UWB antenna according to claim 2, characterized in that: The size of the second metamaterial unit (421") in the second direction is smaller than the size of the first metamaterial unit (421') in the second direction, The second direction is perpendicular to the first direction, and the second direction is perpendicular to the thickness direction of the first substrate (100).

5. The UWB antenna according to claim 1, characterized in that: The size of the parasitic patch (412) in the second direction is greater than or equal to the size of the radiation patch (411) in the second direction, The second direction is perpendicular to the first direction, and the second direction is perpendicular to the thickness direction of the first substrate (100).

6. The UWB antenna according to claim 1, characterized in that: The number of the parasitic patches (412) is at least two, and each of the parasitic patches (412) is evenly arranged on two opposite sides of the radiation patch (411) along the first direction.

7. The UWB antenna according to claim 1, characterized in that: The at least two radiation units (400) include a first radiation unit (400') and a second radiation unit (400"), the first radiation unit (400') being a transmitter, and the second radiation unit (400") being a receiver. The UWB antenna further comprises a metal connector (500), the first substrate (100) and the second substrate (200) are connected via the metal connector (500), and the metal connector (500) is located between the first radiation unit (400') and the second radiation unit (400").

8. The UWB antenna according to claim 1, characterized in that: The operating frequency band of the UWB antenna is 7.8-8.5 GHz, and the beam width of the UWB antenna is 140-190°.

9. A smart screen, characterized in that: The device comprises a middle frame (610), a display module (620) and a UWB radar (630), wherein the middle frame (610) is arranged around the display module (620), the UWB radar (630) is arranged in the middle frame (610), and the UWB radar (630) comprises the UWB antenna (631) according to any one of claims 1 to 8.

10. The smart screen according to claim 9, characterized in that: The UWB radar (630) is arranged between the middle frame (610) and the display module (620), a strip-shaped accommodation space is formed between the first side wall of the middle frame (610) and the first edge of the display module (620), and the UWB antenna (631) is arranged in the strip-shaped accommodation space; or, A mounting groove is provided on a side of the middle frame (610) facing away from the display module (620), a portion of the UWB radar (630) is arranged in the mounting groove, and the UWB antenna (631) is located outside the mounting groove.

11. The smart screen according to claim 10, characterized in that: The at least two radiation units (400) comprise a first radiation unit (400') and a second radiation unit (400"), wherein an extension direction of the first radiation unit (400') toward the second radiation unit (400") is a first direction, and the first direction is parallel to a length direction of the strip-shaped accommodation space. The radiator (410) comprises a radiating patch (411) and a parasitic patch (412) arranged at intervals along the first direction, the radiating patch (411) being provided with the feeding port, a coupling gap being provided between the radiating patch (411) and the parasitic patch (412), the radiating patch (411) and the parasitic patch (412) being coupled to the metamaterial structure (420), the size of the radiating patch (411) in the first direction being larger than the size of the radiating patch (411) in the second direction, The second direction is perpendicular to the first direction, and the second direction is perpendicular to the thickness direction of the first substrate (100).

Images