CN114824771A

CN114824771A - UWB antenna structure and mobile terminal

Info

Publication number: CN114824771A
Application number: CN202210436499.5A
Authority: CN
Inventors: 唐龙; 戴海军
Original assignee: Shenzhen Haidemen Electronics Co ltd
Current assignee: Shenzhen Haidemen Electronics Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-07-29

Abstract

The application discloses UWB antenna structure and mobile terminal. The UWB antenna structure comprises an antenna area, the antenna area is positioned on a first layer of the UWB antenna structure, and the antenna area comprises a radiation patch and is used for realizing the receiving and sending of a first frequency band signal; the radiation paster is the rectangle, and the antenna earthing hole of a plurality of interval arrangements is seted up along width direction to the radiation paster, and the distance of the antenna earthing hole of head end to terminal antenna earthing hole equals with the width of radiation paster, and the antenna structure of this application has reduced the width of radiation paster, and then has reduced antenna structure's size, makes antenna structure's application more nimble.

Description

UWB antenna structure and mobile terminal

Technical Field

The application relates to the technical field of antennas, in particular to a UWB antenna structure and a mobile terminal.

Background

An Ultra Wide Band (UWB) technology is used as a communication technology, has the advantages of high positioning accuracy, high safety, high transmission speed, low power consumption and the like, has a Wide application space in the consumer field, and can be applied to the fields of access management, location service, inter-device communication and the like.

The UWB positioning system is a system for accurately positioning or navigating indoor static or moving objects by utilizing the characteristics of the UWB system, such as strong penetrability, low power consumption, strong multi-path interference resistance, good confidentiality and the like. The UWB system mainly utilizes nanosecond narrow pulses to achieve high-speed data transmission, is low in power consumption and high in safety, and is suitable for indoor accurate positioning. The working frequency band of the UWB system is generally 3.1-10.6 GHz, while the common frequency bands are CH5 (6.24-6.74 GHz) and CH9 (7.73-8.23 GHz), and the working bandwidth is 500 MHz. Currently, the main application fields of UWB positioning systems are: logistics supervision system, mine personnel location, underground garage parking, etc. have extensive using value and prospect.

Aiming at mobile terminal products, the antenna is required to have various requirements such as strong anti-interference capability, miniaturization, high gain, high isolation, good positioning precision and the like, and the antenna for the UWB positioning system of the mobile terminal has higher difficulty and challenge in design. The most important challenge is that the mobile terminal such as a mobile phone pursues a small size, and the wiring structure for the antenna becomes more compact, which results in increasing difficulty in designing the antenna.

Disclosure of Invention

In view of this, embodiments of the present application provide a UWB antenna structure and a mobile terminal, which are beneficial to realizing miniaturization of the UWB antenna structure and the mobile terminal.

The UWB antenna structure comprises an antenna area, wherein the antenna area is positioned on a first layer of the UWB antenna structure and comprises a radiation patch for realizing the receiving and sending of a first frequency band signal;

the radiation patch is rectangular, a plurality of antenna grounding holes are formed in the radiation patch in the width direction, and the distance from the antenna grounding hole at the head end to the antenna grounding hole at the tail end is equal to the width of the radiation patch.

Optionally, the size of the radiation patch is M × N, where M is between 3.6mm and 5.07mm, N is between 3.5mm and 5mm, and a distance between two adjacent antenna ground holes along a width direction of the radiation patch is between 0.3mm and 1 mm.

Optionally, a floor located on a first layer of the UWB antenna structure is further disposed around the radiation patch, and distances between a peripheral edge of the radiation patch and the floor in a width direction and a length direction of the radiation patch are equal and are both between 0.5mm and 0.9 mm.

Optionally, a first feed hole is further formed in the radiation patch, and a distance between the first feed hole and the antenna ground hole at the head end is 0.3mm to 0.9 mm.

Optionally, UWB antenna structure still includes the transmission line district, the signal transmission line in transmission line district is located UWB antenna structure's third layer, first feed hole through first blind hole with the second feed hole on UWB antenna structure's second layer is connected, the second feed hole through the second blind hole with the third feed hole of UWB antenna structure's third layer is connected, first blind hole with the setting is staggered to the second blind hole, first layer the second layer and it has the medium substrate to fill between the third layer, first blind hole is seted up in the first layer and is run through the first layer with the medium substrate between the second layer, the second blind hole is seted up in the second layer and is run through the second layer with the medium substrate between the third layer.

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

Optionally, the second layer, the third layer and the dielectric substrate between the first layer and the fourth layer of the UWB antenna structure are hollowed out at a position corresponding to the radiation patch, so that the fourth layer of the UWB antenna structure serves as a reflective floor of the radiation patch.

Optionally, the UWB antenna structure further comprises a connector zone, the connector zone comprises a signal port, connector pins and a connector, the signal port and the connector pins are located on a fourth layer of the UWB antenna structure, the signal port is connected with the signal transmission line through a third blind hole, the third blind hole is formed in the third layer and penetrates through a medium base material between the third layer and the fourth layer, the connector is attached to the connector pins, and the connector is used for being connected with a main board of the mobile terminal.

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

The application provides a mobile terminal, include as above any one UWB antenna structure, still include the mainboard, UWB antenna structure with the mainboard is connected, the mainboard passes through UWB antenna structure receiving and dispatching signal.

The application provides a UWB antenna structure, including the antenna area, the antenna area includes the radiation paster for realize the receiving and dispatching of first frequency channel signal. The antenna earthing hole of a plurality of interval arrangements is seted up along width direction to the radiation paster, the antenna earthing hole of head end equals with the width of radiation paster to the distance in terminal antenna earthing hole, the width that can furthest occupy the radiation paster of arranging of the antenna earthing hole of head end to terminal antenna earthing hole promptly, the width of radiation paster sets up to the distance in first end both ends antenna earthing hole can, consequently, the antenna structure of this application has reduced the width of radiation paster, and then has reduced antenna structure's size, make antenna structure's application more nimble.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic top view of a first layer of a UWB antenna structure according to an embodiment of the present application;

fig. 2 is a schematic cross-sectional view of a front view of a UWB antenna structure according to an embodiment of the present application;

fig. 3 is a schematic top view of a second layer and a third layer of a UWB antenna structure according to an embodiment of the present application;

fig. 4 is a schematic cross-sectional view of a front view of a UWB antenna structure at various stages of manufacturing according to an embodiment of the present application.

The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings. With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in conjunction with the embodiments and the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments, and not all embodiments. Based on the embodiments in the present application, the following respective embodiments and technical features thereof may be combined with each other without conflict.

Aiming at mobile terminal products, the tag antenna is required to have various requirements such as strong anti-interference capability, miniaturization, high gain, high isolation, good positioning precision and the like, and the antenna design for the mobile terminal UWB positioning system has higher difficulty and challenge. The most important challenge is that the mobile terminal such as a mobile phone pursues a small size, and the wiring structure for the antenna becomes more and more compact, which increases the difficulty of antenna design.

Based on the above problems, the present application provides a UWB antenna structure and a mobile terminal, which have the advantages of being small, light, thin, low in cost, good in directionality, strong in anti-interference capability, and the like, and can be widely applied to various mobile terminal systems.

In a first aspect, embodiments of the present application provide a UWB antenna structure, and the UWB antenna structure may be applied to a UWB positioning system. The UWB antenna structure comprises an antenna region located at a first layer of the UWB antenna structure, i.e. a surface layer of the antenna structure. In practice, the UWB antenna structure is a multi-layer structure, and the structures of other layers will be described one by one in the following embodiments.

Fig. 1 is a schematic top view of a first layer of a UWB antenna structure according to an embodiment of the present application. The antenna region is located in a first layer of the UWB antenna structure. As shown in fig. 1, the antenna area includes a radiation patch 100, and the radiation patch 100 is used for transceiving signals in the first frequency band.

The radiating patch 100 has a size of M × N. As shown in fig. 1, the radiation patch 100 has a plurality of antenna ground holes 110 (6 are taken as an example in fig. 1) arranged at intervals along the width N direction, and the distance from the antenna ground hole at the head end to the antenna ground hole at the tail end is equal to the width N of the radiation patch, that is, the antenna ground hole at the head end and the antenna ground hole at the tail end are close to the long edge of the radiation patch, and the antenna ground hole in the middle is arranged along the width direction to form a row of antenna ground holes. Therefore, the width of the radiation patch can be reduced by reducing the distance from the antenna grounding hole at the head end to the antenna grounding hole at the tail end, so that the size of the antenna structure is reduced, the application of the antenna structure is more flexible, and the antenna structure is more favorable for being applied to a mobile terminal such as a mobile phone which pursues a small size.

It should be noted that the edge of the antenna ground hole is generally provided with a conductive metal, that is, the antenna ground hole includes the hole itself and the conductive metal provided in the hole and at the edge of the hole, and this portion of the conductive metal at the edge of the hole can also be regarded as the edge of the antenna ground hole.

Optionally, the first frequency band signal may be a CH9 frequency band signal (7.73-8.23 GHz). Correspondingly, the radiating patch 100 has a dimension length M of 3.6mm to 5.07mm and a width N of 3.5mm to 5 mm. It can be understood that, in the embodiment of the present application, when the CH9 frequency band signal is transceived, the width N of the radiation patch 100 is set to be between 3.5mm and 5 mm. If it is necessary to receive and transmit signals of other frequency bands, the width N of the radiation patch 100 may be set correspondingly. Or, two antenna sizes are set, so that the dual-frequency signal can be transmitted and received.

In some embodiments, the distance between two adjacent antenna ground holes 110 is between 0.3mm and 1 mm. 0.3mm is the minimum distance between two antenna grounding holes in the process, and the distance less than 0.3mm can cause heavy holes or broken holes. The distance is 1mm at most, and the current on the radiation patch can be ensured to have a sufficient return path. Therefore, in the embodiment of the present application, the distance between two adjacent antenna grounding holes 110 is set to be between 0.3mm and 1mm, and the specific value can be set according to the frequency band of the signal to be received and transmitted. Alternatively, if the antenna is used for transceiving CH9 frequency band signals, the distance between two adjacent antenna ground holes 110 is preferably set to 0.67 mm. The inventor finds that when the distance between two adjacent antenna grounding holes is set to be the distance, the stability of the antenna grounding holes is ensured even if the width of the radiation patch is small.

As shown in fig. 1, in some embodiments, the first layer is further provided with a floor 200, the floor 200 being located around the radiation patch 100. The floor panel 200 is provided with a ground hole 210. The distance X between the peripheral edge of the radiation patch 100 and the floor 200 along the width direction and the length direction of the radiation patch is between 0.5mm and 0.9 mm. The antenna structure of this embodiment has an advantage of miniaturization, and by providing a loop of the ground plate 200 and the ground hole 210 around the radiation patch 100, it is possible to reduce the parasitic capacitance around the radiation patch 100 and maintain the directivity of the antenna radiation pattern in the radiation direction.

As shown in fig. 1, in some embodiments, the radiation patch further has a first feeding hole 120, and a distance between the first feeding hole 120 and the antenna ground hole at the head end is between 0.3mm and 0.9 mm. In the embodiment of the present application, the signal transmission line of the antenna is a transmission line with an impedance of 50 Ω, and in order to ensure that the antenna transmits and receives signals at maximum power, the antenna needs to be matched with the signal transmission line, so the output impedance of the antenna also needs to be 50 Ω, and the distance between the first feed hole 120 and the antenna ground hole 110 can control the output impedance of the antenna, so the distance between the first feed hole 120 and the antenna ground hole 110 can be determined according to the required impedance of 50 Ω. The spacing between the first feed hole 120 and the antenna ground hole 110 is proportional to the size of the radiating patch. However, on the premise that the impedance of the signal transmission line is determined, the feeding points of the radiation patches with different sizes are different, and the smaller the size of the radiation patch is, the closer the feeding point is to the grounding point, which is more beneficial to realizing the miniaturization of the antenna structure, for example, the distance from the feeding point of the radiation patch with 3.6mm by 3.5mm to the grounding point is 0.3mm, and the distance from the feeding point of the radiation patch with 5.07mm by 5mm to the grounding point is 0.9 mm. Therefore, the distance from the first feed hole 120 to the antenna ground hole 110 can be flexibly set according to the size of the radiating patch and the required antenna impedance.

Fig. 2 is a schematic cross-sectional view of a front view of a UWB antenna structure according to an embodiment of the present application. As shown in fig. 2, L1, L2, L3, and L4 are the first layer, the second layer, the third layer, and the fourth layer of the UWB antenna structure, respectively. The radiating patches of the antenna region are located in the first layer of the UWB antenna structure, the L1 layer. A dielectric layer LCP is arranged between two adjacent layers, a dielectric substrate is filled in the dielectric layer, the dielectric substrate comprises a liquid crystal polymer material, and other high-frequency high-speed materials such as polytetrafluoroethylene PTFE, epoxy resin and the like can also be adopted to protect the circuit from being oxidized. AD is an adhesive layer and PI is an encapsulation layer (which may be encapsulated using a cover film), which layers will be described in detail in the following examples.

In some embodiments, as shown in fig. 2, the UWB antenna structure further comprises a transmission line region. The signal transmission line of the transmission line region is located at the third layer of the UWB antenna structure, i.e., the L3 layer. The first feeding hole 120 of the radiation patch 100 on the L1 layer is connected to the second feeding hole (not shown) of the L2 layer of the second layer of the UWB antenna structure through the first blind via 310, and the second feeding hole is connected to the third feeding hole (not shown) of the L3 layer of the third layer of the UWB antenna structure through the second blind via 410.

Alternatively, as shown in fig. 2, the first blind hole 310 and the second blind hole 410 may be arranged to be offset in the vertical direction (stacking direction of the laminate), and may not overlap or partially overlap, which is advantageous in terms of convenience in processing.

In some embodiments, as shown in fig. 2, the first blind via 310 opens in the first L1 layer and penetrates through the dielectric substrate between the first L1 layer and the second L2 layer, and the second blind via 410 opens in the second L2 layer and penetrates through the dielectric substrate between the second L2 layer and the third L3 layer.

In some embodiments, at level L3, floors are provided on both sides of the signal transmission line. The line width of the signal transmission line and the distance between the signal transmission line and the floor at two sides are determined by the thickness of the upper and lower dielectric layers of the signal line, the dielectric constant of the dielectric substrate and the dielectric loss. Generally, the line width of the signal transmission line is 0.085mm, the distance between the signal transmission line and the floors on two sides is 0.107mm, the shortest signal return path of the floors on two sides of the signal transmission line is ensured, signals are shielded, line resonance is eliminated, the signal integrity of the transmission line is improved, impedance matching is achieved, and the reflection coefficient and the transmission line loss are reduced. In actual production, the line width of the signal transmission line may fluctuate between ± 10um, that is, the line width of the signal transmission line ranges from 0.075mm to 0.095mm, so that the distance between the signal transmission line and the floor at two sides may also fluctuate between ± 10um, that is, the distance between the signal transmission line and the floor at two sides ranges from 0.097 mm to 0.117mm, and at this time, the impedance of the antenna may be controlled between 45 Ω to 55 Ω.

In some embodiments, the upper reference is located at the second layer, the L2 layer, of the UWB antenna structure and the lower reference is located at the fourth layer, the L4 layer, of the UWB antenna structure. The signal transmission line is connected with the upper reference ground, the lower reference ground and the floors on two sides of the signal transmission line to form a strip transmission line, and the signal transmission line on the L3 layer is embedded between the two layers of conductors of the upper reference ground and the lower reference ground, so that the electric field is distributed between the two layers of conductors, the radiation energy is reduced, the external radiation interference is reduced, the anti-interference capability is improved, and the integrity of signal transmission is improved.

In some embodiments, the thicknesses of the upper dielectric layer and the lower dielectric layer of the signal transmission line are both 0.1mm, that is, the signal transmission lines are distributed in an up-and-down symmetrical manner, so that the line loss of the signal transmission lines can be reduced.

Fig. 3 is a schematic top view of a second layer and a third layer of a UWB antenna structure according to an embodiment of the present application. As shown in fig. 3, the dielectric substrate between the second layer L2, the third layer L3, and the first layer L1 to the fourth layer L4 of the UWB antenna structure is hollowed out at a position corresponding to the radiation patch of the first layer L1, and other structures are the same as those shown in fig. 1 and are not described herein again. Since the L2 and L3 layers are hollowed out, a through hole 500 is formed in fig. 2, so that the fourth layer L4 of the UWB antenna structure serves as a reflective floor for the radiation patch. The effective height of the radiation patch can be increased by using the layer L4 as a reflection floor of the antenna structure, and the effective height of the radiation patch is positively correlated with the gain, the radiation efficiency and the bandwidth of the antenna. Therefore, the L4 layer is used as the reflecting floor of the antenna structure, so that the gain, the radiation efficiency and the bandwidth of the antenna can be increased, and the performance of the antenna can be improved. It will be appreciated that the height of the radiating patch to the reflective floor can be adjusted by the thickness of the dielectric LCP layer.

In some embodiments, as shown in FIG. 2, the UWB antenna structure also includes a connector zone. The connector region includes signal ports, connector pins, and connectors, which are located at the fourth layer of the UWB antenna structure, i.e., the L4 layer. The signal port is connected to the signal transmission line at the L3 level through the third blind via 600. The connector 700 is located on the AD layer and the PI layer and is attached to the connector pins located on the L4 layer using Surface Mount Technology (SMT). Meanwhile, the connector is also connected with an external main board (not shown in the figure), so that the connection of the whole UWB antenna structure and the external main board is realized, and the external main board can transmit and receive signals through the UWB antenna structure.

In some embodiments, as shown in fig. 2, the antenna zone is disposed near a first edge of the L1 tier (the right edge in fig. 2), the transmission line zone is disposed at the L3 tier, the L3 tier is aligned with a second edge of the same side of the L1 tier (the left edge in fig. 2), the L3 tier is shorter than the L1 tier, and the connector zone is disposed near a second edge of the L4 tier.

In some embodiments, the total thickness of the UWB antenna structure may be set to any one of 0.353mm, 0.403mm, 0.453mm, 0.503mm, etc., the core being to increase or decrease the height of the radiating patch to the reflective floor, the thickness of the LCP layer being set according to the height of the radiating patch to the reflective floor.

It is to be understood that the UWB antenna structure according to the embodiment of the present application may be applied to a UWB positioning system, and may also be applied to other products or fields, which is not specifically limited in this embodiment.

In a second aspect, embodiments of the present application provide a method for manufacturing a UWB antenna structure, which is used to manufacture the UWB antenna structure according to any embodiment of the first aspect. Fig. 4 is a schematic cross-sectional view of a front view of a UWB antenna structure at various stages of manufacturing according to an embodiment of the present application.

As shown in fig. 4, the preparation method includes the steps of:

(1) a double-sided board is selected, and the middle layer of the double-sided board is an LCP layer. The upper and lower layers are copper foils, and are L2 layers and L3 layers of the UWB antenna structure.

(2) Laser drilling is carried out between the L1 layer and the L2 layer of the UWB antenna structure, and then electroplating is carried out to form a blind hole 310; laser drilling is performed between the L2 layer and the L3 layer, and then electroplating is performed to form the blind holes 410.

(3) The portions of the L2 layer and L3 layer were etched using a solvent to form an inner layer wiring.

(4) Two copper foil single plates are selected to serve as an L1 layer and an L4 layer of the UWB antenna structure, and the LCP layer, the L2 layer and the L3 layer are pressed.

(5) Laser drilling is performed between the L3 layer and the L4 layer, and then electroplating is performed to form the blind hole 600. Vias 500 are formed by laser drilling through layers L1 through L4 and then electroplating.

(6) The portions of the L1 and L4 layers were etched using a solvent to form outer layer traces.

(7) And coating adhesive on the outer sides of the L1 layer and the L4 layer to form an AD layer. And then a covering film is pasted on the outer side of the adhesive to form a PI layer. Finished cover films comprising AD and PI layers, such as CVL cover films, can also be applied directly. In the case of film bonding, it is necessary to leave a position for bonding a connector on the outer side of the L4 layer, and to leave no film on the position.

(8) The connector 700 is attached to the outside of the L4 layer using Surface Mount Technology (SMT).

In a third aspect, an embodiment of the present application provides a mobile terminal, including the UWB antenna structure according to the first aspect, and further including a main board, where the UWB antenna structure is connected to the main board, and the main board receives and transmits signals through the UWB antenna structure.

Alternatively, the mobile terminal may be a UWB positioning device. The UWB antenna structure is applied to the UWB positioning equipment, and the miniaturization of the UWB positioning equipment is facilitated. Meanwhile, the UWB antenna structure has strong anti-interference capability and is beneficial to improving the positioning precision of the UWB positioning equipment.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent structural changes made by using the contents of the specification and the drawings are included in the scope of the present application.

Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element, and that elements, features, or elements having the same designation in different embodiments may or may not have the same meaning as that of the other elements, and that the particular meaning will be determined by its interpretation in the particular embodiment or by its context in further embodiments.

The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

Claims

1. An UWB antenna structure is characterized by comprising an antenna area, wherein the antenna area is positioned on a first layer of the UWB antenna structure and comprises a radiation patch used for realizing the receiving and sending of a first frequency band signal;

2. The UWB antenna structure of claim 1 wherein the radiating patches have a dimension M x N, wherein M is between 3.6mm and 5.07mm, N is between 3.5mm and 5mm, and the spacing between two adjacent antenna ground holes along the width direction of the radiating patches is between 0.3mm and 1 mm.

3. The UWB antenna structure of claim 1, wherein a floor is further disposed around the radiation patch on a first layer of the UWB antenna structure, and a peripheral edge of the radiation patch is spaced from the floor by an equal distance in a width direction and a length direction of the radiation patch, and the distance is between 0.5mm and 0.9 mm.

4. The UWB antenna structure of claim 3 wherein the radiation patch is further provided with a first feed hole, and the distance between the first feed hole and the antenna ground hole of the head end is between 0.3mm and 0.9 mm.

5. The UWB antenna structure of claim 4 further comprises a transmission line area, wherein a signal transmission line of the transmission line area is located on a third layer of the UWB antenna structure, the first feeding hole is connected with a second feeding hole of the second layer of the UWB antenna structure through a first blind hole, the second feeding hole is connected with a third feeding 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 arranged in a staggered manner, a dielectric substrate is filled between the first layer, the second layer and the third layer, the first blind hole is arranged on the first layer and penetrates through the dielectric substrate between the first layer and the second layer, and the second blind hole is arranged on the second layer and penetrates through the dielectric substrate between the second layer and the third layer.

6. The UWB antenna structure of claim 5 wherein 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, the signal transmission line is provided with floor boards at the third layer of the UWB antenna structure at two sides, the signal transmission line forms a strip transmission line with the upper reference ground, the lower reference ground and the floor boards at two sides of the signal transmission line, the distance between the signal transmission line and the floor boards at two sides is 0.107mm, and the line width of the signal transmission line is 0.085 mm.

7. The UWB antenna structure of claim 5 wherein the dielectric substrate between the second layer, the third layer and the first to fourth layers of the UWB antenna structure is hollowed out at a position corresponding to the radiation patch, such that the fourth layer of the UWB antenna structure acts as a reflective floor for the radiation patch.

8. The UWB antenna structure of claim 7 further comprising a connector area, wherein the connector area comprises a signal port, a connector pin and a connector, the signal port and the connector pin are located on a 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 disposed on the third layer and penetrates through the dielectric substrate between the third layer and the fourth layer, the connector is attached to the connector pin, and the connector is configured to be connected to a motherboard of a mobile terminal.

9. The UWB antenna structure according to any one of claims 5 to 8, wherein the dielectric substrate comprises a liquid crystal polymer material, and the UWB antenna structure has a thickness of 0.353 mm.

10. A mobile terminal comprising the UWB antenna structure according to any one of claims 1 to 9, and further comprising a main board, the UWB antenna structure being connected to the main board, the main board transmitting and receiving signals through the UWB antenna structure.