An antenna for a UWB positioning system

Abstract

The application discloses an antenna for a UWB positioning system, comprising a dielectric substrate, the upper layer of the dielectric substrate is provided with three antenna modules, the lower layer of the dielectric substrate is provided with a metal floor, the metal floor is connected with a connector, the connector comprises a connector floor and signal pins arranged on the connector floor, each of the antenna modules comprises a radiation patch, an impedance matching transmission line and a coplanar waveguide transmission line, the coplanar waveguide transmission line comprises a signal line and ground lines arranged on both sides of the signal line, a plurality of conductive vias are arranged on the ground lines, the radiation patch is connected with the signal line through the impedance matching transmission line, the other end of the signal line is connected with the signal pins of the connector, and the ground lines are connected with the connector floor through the conductive vias. The application has the advantages of miniaturization, high gain, high isolation, lightness, thinness, low cost and strong anti-interference capability.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an antenna for a UWB positioning system. Background Art

[0002] UWB positioning systems leverage the high penetration, low power consumption, robust multipath interference resistance, and excellent confidentiality of UWB ultra-wideband (UWB) systems to precisely locate or navigate stationary or moving objects indoors. UWB systems primarily utilize nanosecond-level narrow pulses to achieve high-speed data transmission, offering low power consumption and high security, making them suitable for precise indoor positioning. UWB systems operate in the 3.1-10.6 GHz frequency band, with the most commonly used bands being CH5 (6.24-6.74 GHz) and CH9 (7.73-8.23 GHz), with a bandwidth of 500 MHz. Currently, UWB positioning systems are widely used in logistics monitoring systems, mine personnel positioning, and underground parking garages, among other areas, demonstrating their broad application value and promising prospects.

[0003] Currently, common UWB positioning methods include those based on time of arrival (TOA), time difference of arrival (TDOA), location on arrival (AOA), and received signal strength (RSS). The TOA and TDOA methods require calculating the time or time difference between the tag and three or more base stations to estimate the precise location of the tag; while the AOA method requires calculating the distance difference between the tag and two or more base stations to obtain the angle of arrival, thereby roughly estimating the tag's location. For mobile terminal products, the tag antenna must have strong anti-interference capabilities, be miniaturized, have high gain, high isolation, and good positioning accuracy. The antenna design for mobile terminal UWB positioning systems is highly difficult and challenging.

[0004] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention

[0005] In view of the current lack of technology and experience in UWB positioning antennas, the present invention provides an antenna for a UWB positioning system, which has the advantages of miniaturization, high gain, high isolation, lightness, low cost, and strong anti-interference ability, and can be widely used in various mobile terminal systems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention discloses an antenna for a UWB positioning system, comprising a dielectric substrate, wherein the upper layer of the dielectric substrate is provided with three antenna modules, the lower layer of the dielectric substrate is provided with a metal floor, a connector is connected to the metal floor, the connector comprises a connector floor and a signal pin arranged on the connector floor, each of the antenna modules comprises a radiating patch, an impedance matching transmission line and a coplanar waveguide transmission line, the coplanar waveguide transmission line comprises a signal line and a ground line arranged on both sides of the signal line, and a plurality of conductive through-holes are provided on the ground line, the radiating patch is connected to the signal line through the impedance matching transmission line, the other end of the signal line is connected to the signal pin of the connector, and the ground line is connected to the connector floor through the conductive through-hole.

[0008] Preferably, the three antenna modules are respectively printed on the upper layer of the dielectric substrate, and the metal floor is printed on the lower layer of the dielectric substrate.

[0009] Preferably, the three radiation patches of the three antenna modules are arranged in an L-shape, wherein the radiation patches arranged at both ends are receiving antennas, and the radiation patch arranged in the middle is a transmitting antenna.

[0010] Preferably, the distances between the side edges of the radiation patches arranged at both ends and the side edges of the radiation patch arranged in the middle are 17 mm respectively.

[0011] Preferably, the three radiation patches of the three antenna modules are arranged in an equilateral triangle, wherein two of the radiation patches are receiving antennas and one of the radiation patches is a transmitting antenna.

[0012] Preferably, the length of the impedance matching transmission line is 1 / 4 of the operating wavelength.

[0013] Preferably, the impedance matching transmission line is connected at a position that is a preset distance away from the center of the radiation patch.

[0014] Preferably, the width of the signal line is 0.3 mm, and the gaps between the signal line and the ground lines on both sides are 0.1 mm respectively.

[0015] Preferably, a cross-shaped slot is respectively provided at the center of the three radiation patches of the three antenna modules.

[0016] Preferably, the dielectric substrate has a thickness of 0.1-0.4 mm.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: three antenna modules are arranged on the dielectric substrate of the antenna provided in the present invention, one antenna module can be used as a transmitting antenna, and two antenna modules can be used as receiving antennas, which enables the positioning system to achieve multi-target detection and three-dimensional positioning with the least antennas and the simplest system structure, and realizes miniaturization, high gain, high isolation, light weight, low cost, and strong anti-interference ability, and can be widely used in various mobile terminal systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural diagram of an antenna for a UWB positioning system provided by a preferred embodiment of the present invention;

[0019] Figure 2 yes Figure 1 The structural diagram of the connector in;

[0020] Figure 3 is a simulated return loss curve diagram of the antenna provided by the preferred embodiment of the present invention;

[0021] Figure 4 is a simulated isolation curve diagram of the antenna provided by the preferred embodiment of the present invention;

[0022] Figure 5 is a simulated gain curve diagram of the antenna provided by the preferred embodiment of the present invention;

[0023] Figure 6 This is a simulation efficiency curve diagram of the antenna provided by the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit connection.

[0026] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0028] like Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention discloses an antenna for a UWB positioning system, comprising a dielectric substrate 1, wherein three antenna modules are printed on the upper layer of the dielectric substrate 1, a metal floor 5 is printed on the lower layer of the dielectric substrate 1, a connector 10 is connected to the metal floor 5, the connector 10 comprises a connector floor 102 and signal pins 1011, 1012, 1013 arranged on the connector floor 102, each antenna module comprises a radiation patch 21, 22, 23, an impedance matching transmission line 31, 32, 33 and a coplanar waveguide transmission line 41, 42, 43, respectively. The planar waveguide transmission lines 41, 42, 43 respectively include signal lines 71, 72, 73 and ground lines 81, 82, 83 arranged on both sides of the signal lines, and the ground lines 81, 82, 83 are loaded with evenly distributed conductive through-holes 9; the radiation patches 21, 22, 23 are respectively provided with cross slots 61, 62, 63 at the center (by providing the cross slots 61, 62, 63, the radiation patches 21, 22, 23 can cover a specific frequency range), and are connected to the signal lines 71, 72, 73 of the coplanar waveguide transmission lines 41, 42, 43 through impedance matching transmission lines 31, 32, 33; the other ends of the signal lines 71, 72, 73 are connected to the signal pins 1011, 1012, 1013 of the connector 10, and the ground lines 81, 82, 83 are connected to the connector ground 102 through the conductive through-holes 9, wherein Figure 1 The upper portion shown is a top view of the antenna, and the lower portion is a cross-sectional view of the antenna in the thickness direction.

[0029] The spacing between the radiation patch 21 in the middle and the radiation patches 22 and 23 at both ends is 17 mm respectively (the spacing refers to the distance between the adjacent sides of the two radiation patches), and the three radiation patches 21, 22, and 23 are arranged in an L shape, wherein the radiation patch 21 in the middle is used as a transmitting antenna, and the radiation patches 22 and 23 at both ends are used as receiving antennas.

[0030] The impedance matching transmission lines 31 , 32 , 33 are respectively connected at positions deviated from the centers of the radiation patches 21 , 22 , 23 by a certain distance, and the lengths thereof are respectively 1 / 4 of the working wavelength.

[0031] The signal lines 71, 72, 73 of the coplanar waveguide transmission lines 41, 42, 43 have a line width of 0.3 mm, and the gaps between them and the ground lines 81, 82, 83 on either side are 0.1 mm. Furthermore, the signal lines 71, 72, 73 of the coplanar waveguide transmission lines 41, 42, 43 are isolated from each other. In this embodiment, the ground lines 81 and 82 share a metal floor and can be grounded simultaneously.

[0032] The connector 10 is located below the dielectric substrate 1 and is in close contact with the dielectric substrate 1 , that is, the connector 10 is in close contact with the metal floor 5 .

[0033] In this embodiment, the antenna has overall dimensions of 47mm × 32mm × 0.4mm. The dielectric substrate 1 is made of liquid crystal polymer (LCP) material, and its primary operating frequency bands are the CH5 and CH9 bands within the UWB band. Compared to traditional UWB mobile terminal antennas, the antenna of this invention offers numerous advantages, including strong anti-interference capabilities, miniaturization, high gain, high isolation, and excellent positioning accuracy, making it suitable for use in a variety of mobile terminal products.

[0034] like Figure 3 , which is a simulated return loss curve of the antenna according to a preferred embodiment of the present invention, wherein ANT1 represents antenna 1 (radiating patch 21), ANT2 represents antenna 2 (radiating patch 22), and ANT3 represents antenna 3 (radiating patch 23). As can be seen from the figure, the antenna achieves dual-band performance, with center frequencies generally near 6.5 GHz and 8 GHz, which generally meets the requirements.

[0035] like Figure 4 As shown in the figure, it is a simulated isolation curve of the antenna provided by the preferred embodiment of the present invention, wherein the numbers 1, 2, and 3 after S in the figure represent antenna 1 (radiation patch 21), antenna 2 (radiation patch 22), and antenna 3 (radiation patch 23), respectively, that is, S21 is the forward transmission coefficient, that is, the gain, S31 represents the near-end crosstalk, and S32 represents the far-end crosstalk. It can be seen from the figure that the isolation of the antenna is basically above 24.5, indicating that the interference between the three antennas is very small.

[0036] like Figure 5 As shown in the figure, it is a simulated gain curve diagram of the antenna provided by the preferred embodiment of the present invention, wherein ANT1 represents antenna 1 (radiating patch 21), ANT2 represents antenna 2 (radiating patch 22), and ANT3 represents antenna 3 (radiating patch 23); it can be seen from the figure that the gain of the antenna is above 1dBi, has a large radiation range, and can reduce the power consumption of the receiver.

[0037] like Figure 6 As shown in the figure, it is a simulation efficiency curve diagram of the antenna provided by the preferred embodiment of the present invention, wherein ANT1 represents antenna 1 (radiation patch 21), ANT2 represents antenna 2 (radiation patch 22), and ANT3 represents antenna 3 (radiation patch 23); it can be seen from the figure that the efficiency of the antenna is above 25%, which meets the actual needs.

[0038] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. Those skilled in the art will recognize that several equivalent substitutions or obvious variations can be made without departing from the scope of the present invention, and that any equivalent performance or application should be considered to fall within the scope of protection of the present invention.

Claims

1. An antenna for a UWB positioning system, characterized in that: The invention comprises a dielectric substrate made of a liquid crystal polymer material, wherein three antenna modules are provided on the upper layer of the dielectric substrate, and a metal floor is provided on the lower layer of the dielectric substrate. A connector is connected to the metal floor, wherein the connector comprises a connector floor and a signal pin provided on the connector floor. The connector is located below the dielectric substrate and is in close contact with the dielectric substrate, and the connector is in close contact with the metal floor. Each antenna module comprises a radiating patch, an impedance matching transmission line, and a coplanar waveguide transmission line. The coplanar waveguide transmission line comprises a signal line and a ground line provided on both sides of the signal line, and a plurality of conductive through-holes are provided on the ground line. The radiating patch is connected to the signal line through the impedance matching transmission line, the other end of the signal line is connected to the signal pin of the connector, and the ground line is connected to the connector floor through the conductive through-holes.

2. The antenna for a UWB positioning system according to claim 1, wherein: The three antenna modules are respectively printed on the upper layer of the dielectric substrate, and the metal floor is printed on the lower layer of the dielectric substrate.

3. The antenna for a UWB positioning system according to claim 1, wherein: The three radiation patches of the three antenna modules are arranged in an L shape, wherein the radiation patches arranged at both ends are receiving antennas, and the radiation patch arranged in the middle is a transmitting antenna.

4. The antenna for a UWB positioning system according to claim 3, characterized in that: The distances between the side edges of the radiation patches arranged at both ends and the side edges of the radiation patch arranged in the middle are 17 mm respectively.

5. The antenna for a UWB positioning system according to claim 1, wherein: The three radiation patches of the three antenna modules are arranged in an equilateral triangle, wherein two of the radiation patches are receiving antennas and one of the radiation patches is a transmitting antenna.

6. The antenna for a UWB positioning system according to claim 1, characterized in that: The length of the impedance matching transmission line is 1 / 4 of the operating wavelength.

7. The antenna for a UWB positioning system according to claim 1, wherein: The impedance matching transmission line is connected at a position that is a preset distance away from the center of the radiation patch.

8. The antenna for a UWB positioning system according to claim 1, wherein: The width of the signal line is 0.3 mm, and the gaps between the signal line and the ground lines on both sides are 0.1 mm respectively.

9. The antenna for a UWB positioning system according to claim 1, wherein: A cross-shaped slot is respectively formed at the center of the three radiation patches of the three antenna modules.

10. The antenna for a UWB positioning system according to claim 1, wherein: The thickness of the dielectric substrate is 0.1-0.4 mm.

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