CN220368145U

CN220368145U - Miniaturized UWB positioning antenna array, UWB positioning system and handheld terminal

Info

Publication number: CN220368145U
Application number: CN202321696516.5U
Authority: CN
Inventors: 毕晓坤; 李淑惠; 杨椰楠; 谷媛
Original assignee: Shenzhen Sunway Communication Co Ltd
Current assignee: Shenzhen Sunway Communication Co Ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2024-01-19
Anticipated expiration: 2033-06-29

Abstract

The embodiment of the utility model relates to the technical field of wireless positioning, in particular to a miniaturized UWB positioning antenna array, a UWB positioning system and a handheld terminal. The miniaturized UWB positioning antenna array comprises a directional antenna and an omnidirectional antenna, wherein the directional antenna is connected with a transmitting and receiving port, and the omnidirectional antenna is connected with a receiving port; the directional antenna is used for directionally transmitting UWB signals generated by the two-dimensional UWB positioning system main body to the terminal to be positioned; when the terminal to be positioned receives the UWB signal and returns the reflected signal, the directional antenna and the omnidirectional antenna are both used for receiving and transmitting the reflected signal to the two-dimensional UWB positioning system main body so as to realize that the two-dimensional UWB positioning system main body determines the position information of the terminal to be positioned according to the reflected signal. By means of the mode, one of the two directional antennas designed based on the microstrip directional patch antenna scheme is changed into the omni-directional antenna with a simple structure and a small size, miniaturization of the UWB positioning antenna array is achieved, and adaptability of the UWB positioning system to the handheld terminal is improved.

Description

Miniaturized UWB positioning antenna array, UWB positioning system and handheld terminal

Technical Field

The utility model relates to the technical field of wireless positioning, in particular to a miniaturized UWB positioning antenna array, a UWB positioning system and a handheld terminal.

Background

The UWB positioning system is used for determining the position of the target terminal, and is widely applied due to the advantages of simple structure, low cost, low power consumption, strong penetrating power and the like. UWB positioning antenna array is an antenna configuration for UWB positioning systems, which can receive and radiate signals, and is one of the key components of UWB positioning systems. With the rapid development of intelligent internet of things, the application of UWB positioning systems on handheld terminals is receiving increasing attention.

The inventors found in the course of implementing the embodiments of the present utility model that: most UWB positioning antenna arrays are designed based on microstrip directional patch antenna schemes at present, and according to the basic theory of microstrip directional patch antennas, in order to achieve resonance at a central frequency and obtain good performance, the length (radiation side) and width (non-radiation side perpendicular to the radiation side) of a rectangular patch are about one half wavelength of a microstrip line on a dielectric plate. I.e. the inherent characteristics of microstrip directional patch antennas, not only limit their minimum size, but also their application in terminals such as smart AR glasses. Therefore, in order to realize the application of the UWB positioning system in the handheld terminal, the UWB positioning antenna array needs to be miniaturized.

Disclosure of Invention

The technical problem which is mainly solved by the embodiment of the utility model is that the existing UWB positioning system is not easy to be applied to the ultra-small handheld terminal due to the size limitation of the UWB positioning antenna array.

In view of the foregoing, embodiments of the present utility model provide a miniaturized UWB positioning antenna array, UWB positioning system, and handheld terminal that overcome or at least partially solve the foregoing problems.

According to an aspect of an embodiment of the present utility model, there is provided a miniaturized UWB positioning antenna array including: the directional antenna is connected with the transmitting and receiving port, the omnidirectional antenna is connected with the receiving port, the directional antenna is used for directionally transmitting UWB signals generated by the two-dimensional UWB positioning system main body to the terminal to be positioned, and when the terminal to be positioned receives the UWB signals and returns reflected signals, the directional antenna and the omnidirectional antenna are both used for receiving the reflected signals and transmitting the reflected signals to the two-dimensional UWB positioning system main body so as to enable the two-dimensional UWB positioning system main body to determine the position information of the terminal to be positioned according to the reflected signals.

In an alternative way, the miniaturized UWB positioning antenna array is arranged in a stacked structure comprising: the directional antenna comprises a first metal layer, a first dielectric layer, a second metal layer, a second dielectric layer and a third metal layer which are arranged in a stacked mode from top to bottom, wherein the directional antenna is arranged on the first metal layer, the omnidirectional antenna is arranged on the second metal layer, and the ground layer is arranged on the third metal layer.

In an alternative way, the directional antenna is connected to the transmitting and receiving port by a back feed, and the omni-directional antenna is connected to the receiving port by a back feed.

In an alternative manner, the directional antenna and the omni-directional antenna have the same polarization direction, and the relative distance between the radiating center points of the omni-directional antenna and the directional antenna is less than one half wavelength of the highest operating frequency point when airborne.

In an alternative manner, the third metal layer is further provided with an omni-directional antenna feeding point and a directional antenna feeding point, the omni-directional antenna feeding point is connected with the omni-directional antenna, and the directional antenna feeding point is connected with the directional antenna.

In an alternative manner, when the miniaturized UWB positioning antenna array is applied to the UWB CH9 band, the thicknesses of the first dielectric layer and the second dielectric layer are all 0.6 millimeter, the dielectric constant is 3.38, and the dielectric loss is 0.0022.

In an alternative, the first, second, and third metal layers have thicknesses of 0.035 millimeters, 0.018 millimeters, and 0.035 millimeters, respectively.

In an alternative manner, the dimensions of the planar layouts of the first dielectric layer and the second dielectric layer are 17 mm×20 mm.

According to another aspect of an embodiment of the present utility model, there is provided a UWB positioning system including a miniaturized UWB positioning antenna array of any one of the above, a two-dimensional UWB positioning system body, a transmitting and receiving port, and a receiving port, the two-dimensional UWB positioning system body being connected to the reflecting and receiving ports, respectively, the miniaturized UWB positioning antenna array including: the directional antenna is connected with the transmitting and receiving port, the omnidirectional antenna is connected with the receiving port, when the two-dimensional UWB positioning system main body generates UWB signals and transmits the UWB signals to the directional antenna through the transmitting and receiving port, the directional antenna is used for directionally transmitting the UWB signals to a terminal to be positioned, and when the terminal to be positioned receives the UWB signals and returns reflected signals, the directional antenna and the omnidirectional antenna are used for receiving the reflected signals and transmitting the reflected signals to the two-dimensional UWB positioning system main body, so that the two-dimensional UWB positioning system main body determines the position information of the terminal to be positioned according to the reflected signals.

According to yet another aspect of an embodiment of the present utility model, there is provided a handheld terminal including the UWB positioning system described above.

Different from the situation of the related art, the embodiment of the utility model provides a miniaturized UWB positioning antenna array, a UWB positioning system and a handheld terminal, wherein the miniaturized UWB positioning antenna array comprises: the directional antenna is connected with the transmitting and receiving port, the omnidirectional antenna is connected with the receiving port, the directional antenna is used for directionally transmitting UWB signals generated by the two-dimensional UWB positioning system main body to the terminal to be positioned, and when the terminal to be positioned receives the UWB signals and returns reflected signals, the directional antenna and the omnidirectional antenna are both used for receiving the reflected signals and transmitting the reflected signals to the two-dimensional UWB positioning system main body so as to enable the two-dimensional UWB positioning system main body to determine the position information of the terminal to be positioned according to the reflected signals. According to the embodiment of the utility model, one directional antenna of two directional antennas designed based on the microstrip directional patch antenna scheme is changed into the omnidirectional antenna with a simple structure and a small volume, so that the miniaturization of the UWB positioning antenna array is realized, and the adaptability of the UWB positioning system to the handheld terminal is improved.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to scale, unless expressly stated otherwise.

FIG. 1 is a schematic diagram of a UWB positioning system according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a laminated structure of a miniaturized UWB positioning antenna array provided by an embodiment of the utility model;

FIG. 3 is a top view of a first metal layer provided by an embodiment of the present utility model;

FIG. 4 is a top view of a second metal layer provided by an embodiment of the present utility model;

FIG. 5 is a top view of a third metal layer provided by an embodiment of the present utility model;

fig. 6 is a schematic diagram of a reflection coefficient simulation result of a directional antenna according to an embodiment of the present utility model;

fig. 7 is a schematic diagram of a reflection coefficient simulation result of an omni-directional antenna according to an embodiment of the present utility model;

fig. 8 is a schematic diagram of isolation simulation results for a directional antenna and an omni-directional antenna.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It should be noted that, if not in conflict, the features of the embodiments of the present utility model may be combined with each other, which are all within the protection scope of the present utility model. In addition, while the division of functional blocks is performed in a device diagram and the logic sequence is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in a device diagram or the sequence in a flowchart.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The UWB positioning system is a system for performing accurate positioning by using ultra wideband technology, and can be applied to a plurality of scenes by transmitting electromagnetic waves of a series of very short pulses in a short time and realizing high-precision positioning by using propagation characteristics of the pulses in space, and the present utility model is not particularly limited thereto, and can be selected according to practical situations, for example: indoor positioning, article tracking and management, motion analysis, etc., as exemplified below:

in order to improve the efficiency and accuracy of inventory management, a warehouse manager can use a certain handheld terminal as a multi-antenna terminal to be provided with a UWB positioning system, and each commodity is added with a specific UWB single-antenna device as a terminal to be positioned, and each specific UWB single-antenna device is paired with the multi-antenna terminal. When a warehouse manager needs to track a specific commodity, the multi-antenna handheld terminal is automatically connected with the to-be-positioned terminal of the single antenna, so that the UWB positioning system can send UWB signals to the corresponding commodity, the commodity sends reflected signals to the UWB positioning system after receiving the UWB signals, and the UWB positioning system determines the relative position of the mobile phone and the commodity according to the reflected signals.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a UWB positioning system according to an embodiment of the present utility model. The UWB positioning system 1 includes: a miniaturized UWB positioning antenna array 11, a two-dimensional UWB positioning system body 12, a transmitting and receiving port 13 and a receiving port 14.

The two-dimensional UWB positioning system main body 12 is connected to the transmitting/receiving port 13 and the receiving port 14, respectively, and the miniaturized UWB positioning antenna array 11 includes: a directional antenna 111, an omni-directional antenna 112, the directional antenna 111 being connected to the transmitting/receiving port 13, and the omni-directional antenna 112 being connected to the receiving port 14. Wherein the directional antenna includes, but is not limited to, a patch antenna and variations thereof, and the omni-directional antenna includes, but is not limited to, a mono/dipole antenna and variations thereof.

The directional antenna 111 is connected to the transmitting/receiving port 13 by a back feed, and the omni-directional antenna 112 is connected to the receiving port 14 by a back feed. The back feed form indicates that the directional antenna 111 or the omni-directional antenna 112 is connected with the corresponding transmitting and receiving ports 13 and 14 through the interface on the back surface.

In the prior art, the two-dimensional UWB positioning antenna array is generally composed of two directional antennas, one of the directional antennas is replaced by one of the omnidirectional antennas, the omnidirectional antennas do not need to adjust the radiation direction, the structure is simple, and the size is smaller than that of the directional antennas, so that the UWB positioning antenna array is miniaturized, the size of the whole UWB positioning system is reduced, and the handheld terminal has better adaptability.

When the two-dimensional UWB positioning system main body 12 generates a UWB signal and transmits the UWB signal to the directional antenna 111 through the transmitting and receiving port 13, the directional antenna 111 can directionally transmit the UWB signal to the terminal to be positioned; when the terminal to be positioned receives the UWB signal and returns a reflected signal, the directional antenna 111 and the omni-directional antenna 112 can both receive the reflected signal and transmit the reflected signal to the two-dimensional UWB positioning system main body 12, so as to determine the position information of the terminal to be positioned according to the reflected signal by the two-dimensional UWB positioning system main body 12. The terminal to be positioned is a target terminal which needs to be positioned to acquire position information, the reflected signal is a signal reflected back after the terminal to be positioned receives the UWB signal, and the position information is specific position coordinates of the terminal to be positioned.

The embodiment of the utility model provides a UWB positioning system, which changes one directional antenna of two directional antennas in the UWB positioning antenna array designed based on the microstrip directional patch antenna scheme into an omnidirectional antenna with simple structure and small volume, thereby realizing the miniaturization of the UWB positioning antenna array, reducing the size of the UWB positioning system and improving the adaptability of the UWB positioning system to a handheld terminal.

Referring to fig. 2, fig. 2 is a schematic diagram of a laminated structure of a miniaturized UWB positioning antenna array according to an embodiment of the present utility model. The miniaturized UWB positioning antenna array 11 is provided in a laminated structure including: the first metal layer, the first dielectric layer, the second metal layer, the second dielectric layer and the third metal layer are stacked from top to bottom. Wherein directional antenna 111 and omni-directional antenna 112 have the same polarization direction. The polarization direction indicates that the polarization directions of the directional antenna 111 and the omnidirectional antenna 112 are consistent when the directional antenna receives the reflected signal, and the relative distance between the radiation center points of the omnidirectional antenna and the directional antenna is smaller than a half wavelength corresponding to the highest working frequency point when the highest working frequency point propagates in air. The radiation center point represents a point where the main transmitting direction or the receiving direction of the radiation energy of the antenna is located, and the highest working frequency point represents the highest frequency point of the used UWB passband.

Referring to fig. 3, fig. 3 is a top view of a first metal layer, and a directional antenna 111 is disposed on the first metal layer according to an embodiment of the present utility model. Referring to fig. 4, fig. 4 is a top view of a second metal layer, and an omni-directional antenna 112 is disposed on the second metal layer according to an embodiment of the present utility model. Referring to fig. 5, fig. 5 is a top view of a third metal layer provided in an embodiment of the present utility model, a ground layer is disposed on the third metal layer, and the third metal layer is further provided with an omni-directional antenna feeding point and a directional antenna feeding point, wherein the omni-directional antenna feeding point is connected to the omni-directional antenna 112, and the directional antenna feeding point is connected to the directional antenna 111. The directional antenna feed point may activate the directional antenna 111 to directionally transmit UWB signals and receive reflected signals, the omni-directional antenna feed point may activate the omni-directional antenna 112 to receive reflected signals, and the ground layer may be used to increase the front-to-back ratio of the directional antenna to solve the mirror problem caused by positioning.

In the prior art, two directional antennas of the UWB positioning antenna array are usually placed side by side, in the embodiment of the utility model, the directional antennas and the replaced omnidirectional antennas are set to be of a laminated structure (the vertical distance between the directional antennas and the omnidirectional antennas is far smaller than the positioning precision, and the directional antennas can be defaulted to be the same layer in practical use), and the directional antennas are changed to be the omnidirectional antennas with simple structure and small volume, so that the UWB positioning antenna array is miniaturized, and meanwhile, the directional antennas and the omnidirectional antennas are set to be of the laminated structure, so that the structure of the UWB positioning antenna array is more compact, the occupied space is reduced, and the size of the UWB positioning antenna array is further reduced.

When the miniaturized UWB positioning antenna array 11 is applied to the UWB CH9 band, the thicknesses of the first and second dielectric layers may be 0.6 mm, the dielectric constant may be 3.38, and the dielectric loss may be 0.0022. The UWB CH9 frequency band represents a frequency range covered by a 9 th channel in UWB technology, the dielectric constant represents the response capability of the dielectric layer to an electric field, and the dielectric loss represents the degree of energy loss of the dielectric layer in the electric field.

The dimensions of the planar layouts of the first dielectric layer and the second dielectric layer can be 17 mm×20 mm. The dimensions of the plane layout of the first dielectric layer and the second dielectric layer represent the dimensions of the first dielectric layer and the second dielectric layer in a plane view.

The thicknesses of the first, second, and third metal layers may be 0.035 millimeters, 0.018 millimeters, and 0.035 millimeters, respectively.

In summary, the thickness of the miniaturized UWB positioning antenna array 11 may be 1.288 millimeters, that is, the total thickness of the first metal layer, the first dielectric layer, the second metal layer, the second dielectric layer, and the third metal layer. In other embodiments, the thickness and planar layout of the miniaturized UWB positioning antenna array 11 may be further reduced, for example: the planar distance from the directional antenna to the ground layer and the planar distance from the directional antenna to the omnidirectional antenna are reduced, and a person skilled in the art can verify through simulation that the angle precision and the directivity of the directional antenna in the miniaturized UWB positioning antenna array meet preset requirements when the terminal to be positioned is positioned, wherein the preset requirements can be set according to actual conditions, and the utility model is not limited in particular.

It can be understood that, when the miniaturized UWB positioning antenna array 11 is applied to other frequency bands, the parameters related to the dielectric layer and the metal layer can be adjusted according to the actual situation, which is not specifically required in the present disclosure. The lower the frequency band generally used, the larger the size of the UWB positioning antenna array 11, and the higher the frequency band used, the smaller the size of the UWB positioning antenna array 11. For example: when the miniaturized UWB positioning antenna array 11 is applied to the UWB CH5 band, the UWB CH5 band is lower than the UWB CH9 band, so that the dimensions of the planar layouts of the first and second dielectric layers should be adaptively increased.

The bandwidth range represents a frequency range that the antenna can support, and by comparing the bandwidth range with the frequency band range of UWB CH9, it can be determined whether the directional antenna or the omni-directional antenna covers the operating frequency band of UWB CH 9. If the bandwidth range fully covers the frequency band range of the UWB CH9 or the bandwidth range covers a specific sub-range in the CH9 frequency band, the antenna can cover the working frequency band of the UWB CH 9; if the bandwidth range does not completely cover the CH9 band nor does it cover a specific sub-range in the CH9 band, the antenna cannot cover the operating band of UWB CH 9. The specific sub-range may be set according to an actual application, which is not particularly limited by the present utility model.

The parameters such as the reflection coefficient of the antenna, the isolation between the antennas and the like can be simulated and analyzed by a person skilled in the art through simulation software in a computer, and the specific operation is a mature technical means, and the utility model is not described herein.

Referring to fig. 6, fig. 6 is a schematic diagram of a reflection coefficient simulation result of a directional antenna according to an embodiment of the utility model. Wherein the reflection coefficient represents the ratio of the reflected power to the transmitted power of the antenna at the ports, including a transmit receive port 13, a receive port 14. As can be seen from fig. 6, the impedance bandwidth range with the reflection coefficient better than-10 dB is 7.842-8.125GHz, wherein-10 dB is a general antenna performance evaluation index for standardization test and performance comparison, the impedance bandwidth range represents the impedance matching range of the antenna in UWB CH9, 8.125GHz represents the upper limit of the impedance bandwidth range, and 7.842GHz represents the lower limit of the impedance bandwidth range, so that the absolute bandwidth of the directional antenna is 283MHz, and the bandwidth requirement of the positioning test in the CH9 frequency band can be met.

Referring to fig. 7, fig. 7 is a schematic diagram of a reflection coefficient simulation result of an omni-directional antenna according to an embodiment of the present utility model. As can be seen from fig. 7, the impedance bandwidth range with the reflection coefficient better than-10 dB is 7.286-8.394GHz, the 8.394GHz represents the upper limit of the impedance bandwidth range, and the 7.286GHz represents the lower limit of the impedance bandwidth range, so that the absolute bandwidth of the omni-directional antenna is 1108MHz, and the bandwidth requirement of the positioning test in the CH9 frequency band can be satisfied.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating isolation simulation results of a directional antenna and an omni-directional antenna. As can be seen from fig. 8, the isolation is 14.7dB at the worst place in the UWB CH9 operating band. The isolation simulation result shows the mutual interference degree between the directional antenna and the omnidirectional antenna, the place with the worst isolation degree is 14.7dB, which shows that the mutual interference degree between the directional antenna and the omnidirectional antenna is 14.7dB when the mutual interference degree is the highest, and the comparison with the preset isolation degree shows that the mutual interference degree between the directional antenna and the omnidirectional antenna is small, thereby meeting the requirement of the preset isolation degree in the accurate positioning of UWB. The preset isolation degree can be set according to application scenes and positioning accuracy, the disclosure is not limited in particular, and the requirement of UWB accurate positioning is met when the preset isolation degree is generally more than 10 dB. The utility model realizes the miniaturization of the UWB positioning antenna array under the condition of keeping the positioning precision and the coverage range.

In an embodiment of the present utility model, there is provided a miniaturized UWB positioning antenna array including: the directional antenna is connected with the transmitting and receiving port, the omnidirectional antenna is connected with the receiving port, the directional antenna is used for directionally transmitting UWB signals generated by the two-dimensional UWB positioning system main body to the terminal to be positioned, and when the terminal to be positioned receives the UWB signals and returns reflected signals, the directional antenna and the omnidirectional antenna are both used for receiving the reflected signals and transmitting the reflected signals to the two-dimensional UWB positioning system main body so as to enable the two-dimensional UWB positioning system main body to determine the position information of the terminal to be positioned according to the reflected signals. By changing one of the two directional antennas designed based on the microstrip directional patch antenna scheme into the omnidirectional antenna with simple structure and small volume, the miniaturization of the UWB positioning antenna array is realized, and the adaptability of the UWB positioning system to the handheld terminal is improved.

The embodiment of the utility model provides a handheld terminal, which comprises the UWB positioning system, wherein the existing UWB positioning system cannot be applied to the handheld terminal or occupies a large space in the handheld terminal due to the limitation of the size, and the handheld terminal is smaller and lighter by reducing the volume of the UWB positioning system. The handheld terminal comprises a miniaturized UWB positioning antenna array in a UWB positioning system, and technical details and beneficial effects which are not described in detail in the embodiment of the handheld terminal can be seen from the miniaturized UWB positioning antenna array provided by the embodiment of the utility model.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the utility model, the steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A miniaturized UWB positioning antenna array, the miniaturized UWB positioning antenna array comprising: the directional antenna is connected with the transmitting and receiving port, and the omni-directional antenna is connected with the receiving port;

the directional antenna is used for directionally transmitting UWB signals generated by the two-dimensional UWB positioning system main body to the terminal to be positioned;

when the terminal to be positioned receives the UWB signal and returns a reflected signal, the directional antenna and the omnidirectional antenna are both used for receiving the reflected signal and sending the reflected signal to the two-dimensional UWB positioning system main body so as to enable the two-dimensional UWB positioning system main body to determine the position information of the terminal to be positioned according to the reflected signal.

2. A miniaturized UWB positioning antenna according to claim 1, wherein the miniaturized UWB positioning antenna is arranged in a stacked structure comprising:

the first metal layer, the first dielectric layer, the second metal layer, the second dielectric layer and the third metal layer are stacked from top to bottom;

the directional antenna is arranged on the first metal layer, the omnidirectional antenna is arranged on the second metal layer, and the grounding layer is arranged on the third metal layer.

3. A miniaturized UWB positioning antenna array according to claim 1 wherein the directional antenna is connected to the transmit receive port by a back feed and the omni-directional antenna is connected to the receive port by a back feed.

4. A miniaturized UWB positioning antenna array according to claim 1 wherein the directional antenna and the omnidirectional antenna have the same polarization direction and the relative distance between the radiating center points of the omnidirectional antenna and the directional antenna is less than one half wavelength of the highest operating frequency point when airborne.

5. A miniaturized UWB positioning antenna array according to claim 2 wherein the third metal layer further provides omni-directional antenna feed points, directional antenna feed points;

the omni-directional antenna feed point is connected with the omni-directional antenna, and the directional antenna feed point is connected with the directional antenna.

6. The miniaturized UWB positioning antenna array of claim 2 wherein the thickness of the first and second dielectric layers is 0.6 mm, the dielectric constant is 3.38, and the dielectric loss is 0.0022 when the miniaturized UWB positioning antenna array is applied to the UWB CH9 band.

7. A miniaturized UWB positioning antenna array according to claim 6 wherein the thicknesses of the first, second and third metal layers are 0.035 mm, 0.018 mm and 0.035 mm, respectively.

8. A miniaturized UWB positioning antenna array according to claim 7 wherein the dimensions of the planar layout of the first and second dielectric layers are 17 mm x 20 mm.

9. A UWB positioning system, the UWB positioning system comprising: a miniaturized UWB positioning antenna array of any of claims 1 to 8, a two-dimensional UWB positioning system body, a transmit receive port and a receive port;

the two-dimensional UWB positioning system main body is respectively connected with the transmitting and receiving port and the receiving port;

the miniaturized UWB positioning antenna array comprises: the directional antenna is connected with the transmitting and receiving port, and the omnidirectional antenna is connected with the receiving port;

when the two-dimensional UWB positioning system main body generates a UWB signal and transmits the UWB signal to the directional antenna through the transmitting and receiving port, the directional antenna is used for directionally transmitting the UWB signal to a terminal to be positioned;

10. A handheld terminal comprising the UWB positioning system of claim 9.