A UWB antenna structure and mobile terminal

Abstract

This application discloses a UWB antenna structure and a mobile terminal. The UWB antenna structure includes an antenna region located in the first layer of the UWB antenna structure. The antenna region includes a radiating patch for transmitting and receiving signals in a first frequency band. The radiating patch is rectangular and has multiple spaced antenna grounding holes along its width. The distance from the first antenna grounding hole to the last antenna grounding hole is equal to the width of the radiating patch. The antenna structure of this application reduces the width of the radiating patch, thereby reducing the size of the antenna structure and making its application more flexible.

Description

Technical Field

[0001] This application relates to the field of antenna technology, specifically to a UWB antenna structure and a mobile terminal. Background Technology

[0002] Ultra-wideband (UWB) technology, as a communication technology, has advantages such as high positioning accuracy, high security, fast transmission speed, and low power consumption. It has a wide range of applications in the consumer field and can be used in areas such as access control, location services, and communication between devices.

[0003] UWB positioning systems utilize the strong penetration, low power consumption, strong resistance to multipath interference, and good security of UWB ultra-wideband systems to accurately locate or navigate stationary or moving objects indoors. UWB systems primarily use nanosecond-level narrow pulses to achieve high-speed data transmission, and their low power consumption and high security make them suitable for precise indoor positioning. The operating frequency band of UWB systems is generally 3.1–10.6 GHz, with commonly used bands being CH5 (6.24–6.74 GHz) and CH9 (7.73–8.23 GHz), and a working bandwidth of 500 MHz. Currently, the main application areas of UWB positioning systems include logistics monitoring systems, mine personnel positioning, underground parking garages, etc., demonstrating broad application value and promising prospects.

[0004] For mobile terminal products, antennas need to meet numerous requirements, including strong anti-interference capabilities, miniaturization, high gain, high isolation, and good positioning accuracy. Antenna design for mobile terminal UWB positioning systems presents significant challenges. The most significant challenge is the increasing miniaturization of mobile terminals, such as smartphones, leading to increasingly compact antenna wiring structures and further complicating antenna design. Summary of the Invention

[0005] In view of this, the embodiments of this application provide a UWB antenna structure and a mobile terminal, which is beneficial to the miniaturization of the UWB antenna structure and the mobile terminal.

[0006] This application provides a UWB antenna structure, including an antenna region located in the first layer of the UWB antenna structure. The antenna region includes a radiating patch for transmitting and receiving signals in a first frequency band.

[0007] The radiating patch is rectangular, and has multiple spaced antenna grounding holes along its width. The distance between the antenna grounding holes at the beginning and the end is equal to the width of the radiating patch.

[0008] Optionally, the size of the radiating patch is M*N, where M is between 3.6mm and 5.07mm, N is between 3.5mm and 5mm, and the spacing between two adjacent antenna grounding holes along the width direction of the radiating patch is between 0.3mm and 1mm.

[0009] Optionally, a ground plane located in the first layer of the UWB antenna structure is also provided around the radiating patch, and the distance between the peripheral edge of the radiating patch and the ground plane along the width and length directions of the radiating patch is equal and between 0.5 mm and 0.9 mm.

[0010] Optionally, the radiating patch is further provided with a first power feeding hole, and the distance between the first power feeding hole and the antenna grounding hole at the head end is between 0.3mm and 0.9mm.

[0011] Optionally, the UWB antenna structure further includes a transmission line region, wherein the signal transmission line of the transmission line region is located in the third layer of the UWB antenna structure. The first feed hole is connected to the second feed hole of the second layer of the UWB antenna structure through a first blind hole, and the second feed hole is connected to the third feed hole of the third layer of the UWB antenna structure through a second blind hole. The first blind hole and the second blind hole are staggered. A dielectric substrate is filled between the first layer, the second layer and the third layer. The first blind hole is formed in the first layer and penetrates the dielectric substrate between the first layer and the second layer, and the second blind hole is formed in the second layer and penetrates the dielectric substrate between the second layer and the third layer.

[0012] Optionally, the second layer of the UWB antenna structure is provided with an upper reference ground, the fourth layer of the UWB antenna structure is provided with a lower reference ground, and ground planes located on both sides of the signal transmission line are provided on the third layer of the UWB antenna structure. The signal transmission line, the upper reference ground, the lower reference ground, and the ground planes on both sides of the signal transmission line form a strip transmission line. The distance between the signal transmission line and the ground planes on both sides is 0.107mm, and the line width of the signal transmission line is 0.085mm.

[0013] Optionally, the dielectric substrate between the second and third layers and the first to fourth layers of the UWB antenna structure is cut out at a position corresponding to the radiating patch, so that the fourth layer of the UWB antenna structure serves as the reflective ground plane of the radiating patch.

[0014] Optionally, the UWB antenna structure further includes a connector area, which includes a signal port, connector pins, and a connector. The signal port and the connector pins are located on the fourth layer of the UWB antenna structure. The signal port is connected to the signal transmission line through a third blind via. The third blind via is opened on the third layer and penetrates the dielectric substrate between the third layer and the fourth layer. The connector is mated with the connector pins and is used to connect to the motherboard of the mobile terminal.

[0015] Optionally, the dielectric substrate includes a liquid crystal polymer material, and the thickness of the UWB antenna structure is 0.353 mm.

[0016] This application provides a mobile terminal, including a UWB antenna structure as described in any of the preceding claims, and a motherboard, wherein the UWB antenna structure is connected to the motherboard, and the motherboard transmits and receives signals through the UWB antenna structure.

[0017] This application provides a UWB antenna structure, including an antenna region comprising a radiating patch for transmitting and receiving signals in a first frequency band. The radiating patch has multiple spaced-apart antenna grounding holes along its width. The distance between the first and last antenna grounding holes is equal to the width of the radiating patch. This arrangement maximizes the width of the radiating patch, and the width of the radiating patch can be set to the distance between the first and last antenna grounding holes. Therefore, this antenna structure reduces the width of the radiating patch, thereby reducing the overall size of the antenna structure and making its application more flexible. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0019] Figure 1 This is a top view of the first layer of a UWB antenna structure according to an embodiment of this application;

[0020] Figure 2 This is a front view schematic diagram of the UWB antenna structure according to an embodiment of this application;

[0021] Figure 3 This is a top view of the second and third layers of a UWB antenna structure according to an embodiment of this application;

[0022] Figure 4 This is a front view schematic diagram of the fabrication stage of a UWB antenna structure according to an embodiment of this application.

[0023] The realization of the objectives, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly described below in conjunction with the embodiments and accompanying drawings. Obviously, the described embodiments are only a part of the embodiments, and not all of them. Based on the embodiments in this application, the following embodiments and their technical features can be combined with each other without conflict.

[0025] Ultra-wideband (UWB) technology, as a communication technology, has advantages such as high positioning accuracy, high security, fast transmission speed, and low power consumption. It has a wide range of applications in the consumer field and can be used in areas such as access control, location services, and communication between devices.

[0026] UWB positioning systems utilize the strong penetration, low power consumption, strong resistance to multipath interference, and good security of UWB ultra-wideband systems to accurately locate or navigate stationary or moving objects indoors. UWB systems primarily use nanosecond-level narrow pulses to achieve high-speed data transmission, and their low power consumption and high security make them suitable for precise indoor positioning. The operating frequency band of UWB systems is generally 3.1–10.6 GHz, with commonly used bands being CH5 (6.24–6.74 GHz) and CH9 (7.73–8.23 GHz), and a working bandwidth of 500 MHz. Currently, the main application areas of UWB positioning systems include logistics monitoring systems, mine personnel positioning, underground parking garages, etc., demonstrating broad application value and promising prospects.

[0027] For mobile terminal products, tag antennas need to meet numerous requirements, including strong anti-interference capabilities, miniaturization, high gain, high isolation, and good positioning accuracy. Antenna design for mobile terminal UWB positioning systems presents significant challenges. The most significant challenge is the increasing miniaturization of mobile terminals, such as smartphones, leading to increasingly compact antenna wiring structures and further complicating antenna design.

[0028] To address the aforementioned issues, this application provides a UWB antenna structure and mobile terminal, which features miniaturization, thinness, low cost, good directivity, and strong anti-interference capabilities, and can be widely applied in various mobile terminal systems.

[0029] Firstly, embodiments of this application provide a UWB antenna structure that can be applied to a UWB positioning system. The UWB antenna structure includes an antenna region located in the first layer of the UWB antenna structure, i.e., the surface layer of the antenna structure. In fact, the UWB antenna structure is a multi-layered structure; the structures of the other layers will be described one by one in the following embodiments.

[0030] Figure 1 This is a top view of the first layer of a UWB antenna structure according to an embodiment of this application. The antenna region is located in the first layer of the UWB antenna structure. Figure 1 As shown, the antenna region includes a radiating patch 100, which is used to transmit and receive signals in the first frequency band.

[0031] The dimensions of the radiating patch 100 are M*N. For example... Figure 1 As shown, the radiating patch 100 has multiple spaced antenna grounding holes 110 along the width N direction. Figure 1 Taking six antennas as an example, the distance from the first antenna grounding hole to the last antenna grounding hole is equal to the width N of the radiating patch. That is, the first and last antenna grounding holes are adjacent to the long edge of the radiating patch, and the middle antenna grounding holes are opened along the width direction, forming a row of antenna grounding holes. Therefore, by reducing the distance from the first to the last antenna grounding hole, this application can reduce the width of the radiating patch, thereby reducing the size of the antenna structure. This makes the antenna structure more flexible in application and more suitable for use in mobile terminals that require small sizes, such as mobile phones.

[0032] It should be noted that the edges of antenna grounding holes are generally provided with conductive metal. That is, the antenna grounding hole includes the hole itself and the conductive metal set inside the hole and at the edge of the hole. This part of the conductive metal at the edge of the hole can also be regarded as the edge of the antenna grounding hole.

[0033] Optionally, the first frequency band signal can be a CH9 frequency band signal (7.73–8.23 GHz). Correspondingly, the length M of the radiating patch 100 is between 3.6 mm and 5.07 mm, and the width N is between 3.5 mm and 5 mm. It is understood that in this embodiment, when transmitting and receiving CH9 frequency band signals, the width N of the radiating patch 100 is set to between 3.5 mm and 5 mm. If it is necessary to transmit and receive signals in other frequency bands, the width N of the radiating patch 100 can be set accordingly. Alternatively, by setting two antenna sizes, dual-frequency signal transmission and reception can be achieved.

[0034] In some embodiments, the spacing between two adjacent antenna grounding holes 110 is between 0.3mm and 1mm. 0.3mm is the minimum spacing between two antenna grounding holes in the manufacturing process; a spacing less than 0.3mm will result in overlapping or broken holes. A maximum spacing of 1mm ensures sufficient return path for the current on the radiating patch. Therefore, in this embodiment, the spacing between two adjacent antenna grounding holes 110 is set between 0.3mm and 1mm, and the specific value can be set according to the frequency band of the signal to be transmitted and received. Optionally, if the antenna is used to transmit and receive CH9 band signals, the spacing between two adjacent antenna grounding holes 110 is preferably set to 0.67mm. The inventors have found that setting the spacing between two adjacent antenna grounding holes to this distance results in a small radiating patch width while ensuring the stability of the antenna grounding holes.

[0035] like Figure 1 As shown, in some embodiments, the first layer further includes a ground plane 200, which is located around the radiating patch 100. A grounding hole 210 is provided on the ground plane 200. The distance X between the peripheral edge of the radiating patch 100 and the ground plane 200 along both the width and length directions of the radiating patch is between 0.5 and 0.9 mm. This embodiment of the antenna structure has the advantage of miniaturization, and by providing a ring of ground plane 200 and grounding hole 210 around the radiating patch 100, the parasitic capacitance around the radiating patch 100 can be reduced, maintaining the directional nature of the antenna radiation pattern in the radiation direction.

[0036] like Figure 1 As shown, in some embodiments, a first feed hole 120 is also provided on the radiating patch, and the distance between the first feed hole 120 and the antenna ground hole at the beginning end is between 0.3mm and 0.9mm. In this embodiment, the antenna signal transmission line is a transmission line with an impedance of 50Ω. To ensure that the antenna transmits and receives signals with maximum power, the antenna needs to be matched with the signal transmission line. Therefore, the output impedance of the antenna must also be 50Ω. The distance between the first feed hole 120 and the antenna ground hole 110 can control the output impedance of the antenna. Therefore, the distance between the first feed hole 120 and the antenna ground hole 110 can be determined according to the required 50Ω impedance. The distance between the first feed hole 120 and the antenna ground hole 110 is proportional to the size of the radiating patch. However, given a fixed impedance of the signal transmission line, the feed point location differs depending on the size of the radiating patch. Smaller radiating patches have feed points closer to the grounding point, which is more conducive to miniaturizing the antenna structure. For example, the distance between the feed point and the grounding point is 0.3mm for a 3.6mm*3.5mm radiating patch and 0.9mm for a 5.07mm*5mm radiating patch. Therefore, the distance between the first feed hole 120 and the antenna ground hole 110 can be flexibly set according to the size of the radiating patch and the required antenna impedance.

[0037] Figure 2 This is a front view schematic diagram of the UWB antenna structure according to an embodiment of this application. Figure 2 As shown, L1, L2, L3, and L4 are the first, second, third, and fourth layers of the UWB antenna structure, respectively. The radiating patch of the antenna region is located in the first layer of the UWB antenna structure, i.e., layer L1. Between adjacent layers is a dielectric layer LCP, which is filled with a dielectric substrate. The dielectric substrate includes liquid crystal polymer materials, but other high-frequency and high-speed materials such as polytetrafluoroethylene (PTFE) and epoxy resin can also be used to protect the circuitry from oxidation. AD is the adhesive layer, and PI is the encapsulation layer (a cover film can be used for encapsulation). These layers will be described in detail in the following embodiments.

[0038] In some embodiments, such as Figure 2 As shown, the UWB antenna structure also includes a transmission line region. The signal transmission lines in the transmission line region are located in the third layer, L3, of the UWB antenna structure. The first feed hole 120 on the radiating patch 100 located in the L1 layer is connected to the second feed hole (not shown in the figure) of the second layer L2 of the UWB antenna structure through the first blind hole 310. The second feed hole is connected to the third feed hole (not shown in the figure) of the third layer L3 of the UWB antenna structure through the second blind hole 410.

[0039] Optionally, such as Figure 2 As shown, the first blind hole 310 and the second blind hole 410 can be staggered in the vertical direction (the stacking direction of the layers), and can be non-overlapping or partially overlapping. The advantage of this design is that it facilitates processing.

[0040] In some embodiments, such as Figure 2 As shown, the first blind via 310 is formed in the first layer L1 and penetrates the dielectric substrate between the first layer L1 and the second layer L2, and the second blind via 410 is formed in the second layer L2 and penetrates the dielectric substrate between the second layer L2 and the third layer L3.

[0041] In some embodiments, ground planes are provided on both sides of the signal transmission line in layer L3. The linewidth of the signal transmission line and the distance between the signal transmission line and the ground planes on both sides are determined by the thickness of the dielectric layers above and below the signal line and the dielectric constant and dielectric loss of the substrate. Generally, the linewidth of the signal transmission line is 0.085 mm, and the distance between the signal transmission line and the ground planes on both sides is 0.107 mm. This ensures that the signal return path of the signal transmission line is minimized and the signal is shielded, eliminating line resonance, improving the signal integrity of the transmission line, thereby achieving impedance matching and reducing the reflection coefficient and transmission line loss. In actual production, the linewidth of the signal transmission line may fluctuate by ±10 μm, that is, the linewidth of the signal transmission line is between 0.075 mm and 0.095 mm. This also causes the distance between the signal transmission line and the ground planes on both sides to fluctuate by ±10 μm, that is, the distance between the signal transmission line and the ground planes on both sides is between 0.097 mm and 0.117 mm. In this case, the impedance of the antenna will be controlled between 45 Ω and 55 Ω.

[0042] In some embodiments, the upper reference ground is located in the second layer of the UWB antenna structure, i.e., layer L2, and the lower reference ground is located in the fourth layer of the UWB antenna structure, i.e., layer L4. The signal transmission line is connected to the upper reference ground, the lower reference ground, and the ground planes on both sides of the signal transmission line to form a strip transmission line. This is equivalent to the signal transmission line located in layer L3 being embedded between the two conductors of the upper and lower reference grounds. Therefore, the electric field distribution is all between the two conductors, reducing radiated energy, reducing external radiated interference, increasing anti-interference capability, and improving the integrity of signal transmission.

[0043] In some embodiments, the thickness of the dielectric layers above and below the signal transmission line is 0.1 mm, that is, the dielectric layers are symmetrically distributed above and below the signal transmission line, which can reduce the line loss of the signal transmission line.

[0044] Figure 3 This is a top view schematic diagram of the second and third layers of a UWB antenna structure according to an embodiment of this application. Figure 3 As shown, the dielectric substrate between the second L2 layer, the third L3 layer, and the first L1 layer to the fourth L4 layer of the UWB antenna structure is hollowed out at the position corresponding to the radiating patch of the first L1 layer. Other structures are similar to... Figure 1 The same applies as shown, so it will not be repeated here. Because layers L2 and L3 are hollowed out, this will create... Figure 2 The through-hole 500 allows the fourth layer, L4, of the UWB antenna structure to serve as the reflector ground plane for the radiating patch. Using layer L4 as the reflector ground plane increases the effective height of the radiating patch, and the effective height of the radiating patch is positively correlated with the antenna's gain, radiation efficiency, and bandwidth. Therefore, using layer L4 as the reflector ground plane can increase the antenna's gain, radiation efficiency, and bandwidth, thus improving antenna performance. It is understandable that the height of the radiating patch from the reflector ground plane can be adjusted by the thickness of the LCP dielectric layer.

[0045] In some embodiments, such as Figure 2 As shown, the UWB antenna structure also includes a connector area. This connector area includes a signal port, connector pins, and a connector. The signal port and connector pins are located on the fourth layer of the UWB antenna structure, i.e., layer L4. The signal port is connected to the signal transmission line located on layer L3 via a third blind via 600. The connector 700 is located on the AD and PI layers and is mounted on the connector pins on layer L4 using surface mount technology (SMT). Simultaneously, the connector also connects to an external motherboard (not shown in the figure), thus connecting the entire UWB antenna structure to the external motherboard, allowing the external motherboard to transmit and receive signals via the UWB antenna structure.

[0046] In some embodiments, such as Figure 2 As shown, the antenna region is close to the first edge of the L1 layer ( Figure 2 The transmission line area is located on the L3 layer, at the right edge of the middle section. The second edge of the L3 layer is on the same side as the L1 layer. Figure 2 Aligned with the left edge of the middle layer, the L3 layer is shorter than the L1 layer, and the connector area is set near the second edge of the L4 layer.

[0047] In some embodiments, the total thickness of the UWB antenna structure can be set to any one of 0.353mm, 0.403mm, 0.453mm, 0.503mm, etc. The key is to increase or decrease the height of the radiating patch from the reflective ground plane, and set the thickness of the LCP layer according to the height of the radiating patch from the reflective ground plane.

[0048] It is understood that the UWB antenna structure of this application embodiment can be applied to UWB positioning systems, as well as to other products or fields, and this embodiment does not specifically limit it.

[0049] Secondly, embodiments of this application provide a method for fabricating a UWB antenna structure, used to fabricate a UWB antenna structure as described in any embodiment of the first aspect. Figure 4 This is a front view schematic diagram of the fabrication stage of a UWB antenna structure according to an embodiment of this application.

[0050] like Figure 4 As shown, the preparation method includes the following steps:

[0051] (1) Select a double-sided panel with an LCP layer in the middle. The upper and lower layers are copper foil, which serve as the L2 and L3 layers of the UWB antenna structure.

[0052] (2) Laser drilling is performed between the L1 and L2 layers of the UWB antenna structure, followed by electroplating to form blind holes 310; laser drilling is performed between the L2 and L3 layers, followed by electroplating to form blind holes 410.

[0053] (3) Use a solvent to etch parts of the L2 and L3 layers to form inner layer circuitry.

[0054] (4) Select two copper foil single boards as L1 and L4 layers of the UWB antenna structure, and press them together with L2 and L3 layers through LCP layer.

[0055] (5) Laser drilling is performed between layers L3 and L4, followed by electroplating to form a blind hole 600. Laser drilling is performed through layers L1 to L4, followed by electroplating to form a through hole 500.

[0056] (6) Use solvent to etch parts of L1 and L4 layers to form outer layer circuitry.

[0057] (7) Apply adhesive to the outside of layers L1 and L4 to form the AD layer. Then apply a cover film to the outside of the adhesive to form the PI layer. Alternatively, a finished cover film including both the AD and PI layers, such as CVL cover film, can be applied directly. When applying the film, leave space outside layer L4 for attaching the connector; this space should not be covered with film.

[0058] (8) Use surface mount technology (SMT) to attach connector 700 to the outside of L4 layer.

[0059] Thirdly, embodiments of this application provide a mobile terminal, including the UWB antenna structure as described in the first aspect, and also including a motherboard. The UWB antenna structure is connected to the motherboard, and the motherboard transmits and receives signals through the UWB antenna structure.

[0060] Optionally, the mobile terminal can be a UWB positioning device. Applying a UWB antenna structure to a UWB positioning device is beneficial for its miniaturization. Simultaneously, the UWB antenna structure has strong anti-interference capabilities, which helps improve the positioning accuracy of the UWB positioning device.

[0061] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made using the content of this specification and drawings are similarly included in the patent protection scope of this application.

[0062] Without further restrictions, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same name in different embodiments may have the same meaning or may have different meanings, the specific meaning of which needs to be determined by its interpretation in that specific embodiment or by further consideration of the context of that specific embodiment.

[0063] The terms “or” and “and / or” are interpreted as inclusive, or mean either one or any combination thereof. Exceptions to this definition occur only when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

Claims

1. A UWB antenna structure, characterized in that, The antenna region is located in the first layer of the UWB antenna structure. The antenna region includes a radiating patch for transmitting and receiving signals in a first frequency band, which is a frequency band signal of 7.73~8.23GHz. The radiating patch is rectangular, and it has multiple spaced antenna grounding holes along its width. The distance between the antenna grounding holes at the beginning and the end is equal to the width of the radiating patch. The distance between two adjacent antenna grounding holes along the width direction of the radiating patch is 0.67 mm; The radiating patch is also provided with a first feeding hole, and the distance between the first feeding hole and the antenna grounding hole at the head end is between 0.3mm and 0.9mm. It also includes a transmission line area, wherein the signal transmission line of the transmission line area is located in the third layer of the UWB antenna structure. The first feed hole is connected to the second feed hole of the second layer of the UWB antenna structure through a first blind hole. The second feed hole is connected to the third feed hole of the third layer of the UWB antenna structure through a second blind hole. The first blind hole and the second blind hole are staggered. A dielectric substrate is filled between the first layer, the second layer and the third layer. The first blind hole is opened in the first layer and penetrates the dielectric substrate between the first layer and the second layer. The second blind hole is opened in the second layer and penetrates the dielectric substrate between the second layer and the third layer. The size of the radiation patch is M*N, where M is between 3.6mm and 5.07mm and N is between 3.5mm and 5mm. A ground plane located on the first layer of the UWB antenna structure is also provided around the radiating patch. The distance between the peripheral edge of the radiating patch and the ground plane along the width and length directions of the radiating patch is equal and between 0.5 mm and 0.9 mm. The dielectric substrate between the second and third layers and the first to fourth layers of the UWB antenna structure is hollowed out at the position corresponding to the radiating patch, so that the fourth layer of the UWB antenna structure serves as the reflective ground plane of the radiating patch. The thickness of the UWB antenna structure is 0.353 mm.

2. The UWB antenna structure according to claim 1, characterized in that, The second layer of the UWB antenna structure has an upper reference ground, the fourth layer of the UWB antenna structure has a lower reference ground, and ground planes located on both sides of the signal transmission line are provided on the third layer of the UWB antenna structure. The signal transmission line, the upper reference ground, the lower reference ground, and the ground planes on both sides of the signal transmission line form a strip transmission line. The distance between the signal transmission line and the ground planes on both sides is 0.107mm, and the line width of the signal transmission line is 0.085mm.

3. The UWB antenna structure according to claim 1, characterized in that, It also includes a connector area, which includes a signal port, connector pins, and a connector. The signal port and the connector pins are located on the fourth layer of the UWB antenna structure. The signal port is connected to the signal transmission line through a third blind hole. The third blind hole is opened on the third layer and passes through the dielectric substrate between the third layer and the fourth layer. The connector is mated with the connector pins and is used to connect to the motherboard of the mobile terminal.

4. The UWB antenna structure according to claim 1, characterized in that, The dielectric substrate includes a liquid crystal polymer material.

5. A mobile terminal, characterized in that, The device includes the UWB antenna structure as described in any one of claims 1 to 4, and further includes a motherboard, wherein the UWB antenna structure is connected to the motherboard, and the motherboard transmits and receives signals through the UWB antenna structure.

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