UWB positioning antenna based on LCP material

Abstract

The application discloses an ultra-thin broadband UWB positioning antenna based on an LCP material, which is suitable for ultra-wideband positioning applications in a frequency band of 7163 MHz to 8812 MHz. The antenna comprises a plurality of layers of LCP substrates and a plurality of metal layers arranged therebetween, each metal layer being provided with a plurality of metal strip structures, the strip structures being electrically connected to the bottom layer metal reflection ground through staggered metalized blind holes and buried holes, and a coupled resonant structure being constructed to expand the working bandwidth. The antenna adopts a coplanar waveguide feed, excites a rectangular radiation patch to realize main mode radiation, and forms stable edge radiation characteristics through a gap and a reflection ground. In order to improve flexibility, the strip structure is provided with partial openings and hollow designs in specific areas, and is matched with a bending area without an LPI layer to enhance the overall bendable capability. The antenna structure is compact, small in thickness and strong in adaptability, can realize high radiation efficiency and directional diagram stability in a wide frequency band, and is suitable for UWB positioning terminals with requirements of lightness, thinness, high efficiency and flexibility.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave communication and UWB positioning, and in particular relates to an ultra-thin broadband UWB positioning antenna based on LCP material. Background Art

[0002] With the rapid development of the Internet of Things (IoT), high-precision indoor positioning, augmented reality (AR), and smart wearable devices, ultra-wideband (UWB) wireless technology has emerged as a leader among numerous short-range communication and positioning solutions, thanks to its nanosecond pulses, centimeter-level positioning accuracy, low power consumption, and robust multipath interference mitigation. In recent years, the demand for centimeter-level real-time location (RTLS) in scenarios such as logistics and warehousing, industrial asset management, smart healthcare, and smart homes has skyrocketed, further fueling research into miniaturized, efficient, and easily integrated UWB antenna solutions.

[0003] At the same time, spectrum management policies are constantly evolving both domestically and internationally. my country's new regulations for UWB transmitters limit the usable operating frequency band to the 7163 MHz–8812 MHz range, corresponding to the international standard channels CH8–CH11. Previously widely used lower center frequency bands (such as those around 3993 MHz and 6489 MHz) are no longer permitted. These new frequency restrictions mean that achieving broadband, low-loss, and highly efficient antennas within the higher microwave bands has become a critical challenge for the industry. Furthermore, the pursuit of lightweight, flexible, and bendable mechanical properties in wearable and embedded devices poses significant challenges to traditional rigid printed circuit board (PCB) antennas.

[0004] Currently, the most commonly used UWB positioning antennas are monopole or patch-type planar structures, with substrates often made of FR-4, ceramic, or high-frequency microwave PCB materials. Although these antennas can achieve a wide impedance bandwidth through mode mixing within the traditional UWB frequency band of 3.1 GHz–10.6 GHz, dielectric losses increase dramatically above 6 GHz, significantly reducing radiation efficiency. Furthermore, high-order mode interference can easily cause pattern distortion, making it difficult to maintain broadside stability across a wide frequency band. Furthermore, conventional PCB substrates are thick and rigid, making them unable to meet the thinness and flexible bendability requirements of today's smart devices. Furthermore, if the substrate thickness is forced to be reduced, mechanical strength and production reliability will also be reduced.

[0005] Liquid crystal polymer (LCP) is an ideal substrate for next-generation high-frequency flexible circuits due to its low dielectric constant, low loss tangent, extremely low moisture absorption, chemical resistance, and inherent flexibility. However, truly applying LCP to UWB positioning antennas is not a simple material replacement: in the ultra-thin, bendable LCP laminate structure, issues such as metal layer coupling, electromagnetic mode control, feed type, and bending reliability become more prominent, requiring innovation in antenna structure and operating mechanism, combined with high-precision processing technology to achieve a balance. Especially in the high-frequency band of 7-9 GHz, the desire to achieve the new national standard bandwidth sufficient to cover multiple channels with a single main radiating element, while also combining a stable side-firing field pattern, repeatable mass production, and mechanical flexibility, remains a pain point and research hotspot in the industry.

[0006] Therefore, in order to address multiple challenges such as high-frequency band loss control, broadband resonant mode design, directional pattern stability assurance, and reliable forming of flexible substrates, the development of a truly broadband, efficient, ultra-thin, flexible UWB positioning antenna technology that meets the new national standard channel requirements has become an urgent need of common concern to industry and academia. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides an ultra-thin broadband UWB positioning antenna based on LCP material, which increases the working mode and expands the working bandwidth while having stable radiation, compact size, light weight and bending resistance.

[0008] Specifically, the technical solutions provided by the present invention are as follows:

[0009] A UWB positioning antenna based on LCP material, comprising metal layers M1 to M7 arranged sequentially from top to bottom, each of the metal layers being based on an LCP single-sided board and including a BTB region, a flexible bending region, and a radiator region adjacent to each other in sequence;

[0010] The metal layer M1 and the metal layer M7 are provided with metal grounds (11, 71) corresponding to the BTB region, and the metal grounds (11, 71) and corresponding positions of the metal layers M2 to M6 are provided with metallized through-hole arrays (12, 22, 32, 42, 52, 62, 72), and the metal layer M1 and the metal layer M7 are electrically connected via the metallized through-hole arrays;

[0011] Metal plane structures are provided on the metal layers M1 to M6, and the metal plane structures on each metal layer are electrically connected to the metal reflective ground (79) of the metal layer M7 through interlayer staggered metalized blind holes / buried holes; the metal plane structure on the metal layer M4 is electrically connected to the metalized through-hole array (12, 22, 32, 42, 52, 62, 72);

[0012] A feed line (48) is also provided on the metal layer M4, one end of the feed line (48) is electrically connected to a coplanar waveguide feed line (78) provided on the metal layer M7 through corresponding feed blind holes provided on the metal layers M4 to M6, and the other end of the feed line (48) is electrically connected to a coupling patch (16) provided on the radiator region of the metal layer M1 and an annular ring (76) provided on the radiator region of the metal layer M7 through corresponding feed through holes provided on the metal layers M1 to M6;

[0013] A radiation patch (15) is further provided on the periphery of the coupling patch (16) of the metal layer M1, and a gap for providing a coupling component is left between the radiation patch (15) and the coupling patch (16); and a gap for preventing a short circuit of the feed through hole is left between the metal reflection ground (79) of the metal layer M7 and the hole ring (76) provided therein.

[0014] Furthermore, the metal plane structure provided on the radiator regions of the metal layers M1, M3 and M5 and the metal reflective ground (79) of the radiator region of the metal layer M7 do not extend into the flexible bending region, and the portion of the metal plane structure provided on the radiator regions of the metal layers M2, M4 and M6 extending into the flexible bending region is hollowed out.

[0015] Preferably, the metal plane structure provided on the metal layers M1, M3 and M5 is a rectangular metal strip (13, 33, 53); the metal plane structure provided on the metal layers M2, M4 and M6 is a partially hollowed-out "Γ"-shaped metal strip (23, 43, 63), and the hollowed-out portion corresponds to the flexible bending area.

[0016] Preferably, the upper edge of the "Γ"-shaped metal strip (43) provided on the metal layer M4 is flush with the upper edge of the metal ground (11, 71) on the metal layers M1 and M7.

[0017] Furthermore, the metal plane structures of the metal layers M1 and M7 are provided with metalized blind vias (14, 74), and the metal plane structures of the metal layers M2 to M6 are provided with metalized buried vias (24, 34, 44, 54, 64); the arrangement of the metalized blind vias (14) and the metalized buried vias (34, 54) is consistent, and the arrangement of the metalized buried vias (24, 44, 64) and the metalized blind vias (74) is consistent, and the relative positions of the metalized blind vias / buried vias are staggered between adjacent metal layers.

[0018] Preferably, one end of the feed line (48) is embedded in the metallized through hole array (42) and is semi-surrounded by the metallized through hole array (42).

[0019] Furthermore, the BTB area and radiator area on the top and bottom surfaces of the antenna are covered with LPI layers, while the flexible bending area has no LPI layer; the BTB area on the bottom surface of the antenna is also provided with a terminal solder resist area for welding the BTB terminals.

[0020] Compared with existing UWB antenna solutions that are mainly based on rigid PCBs or ceramic substrates, the present invention achieves an overall improvement in deep integration in multiple dimensions such as structure, materials, electromagnetic performance and manufacturability.

[0021] First, the use of an ultra-thin LCP laminate, characterized by low loss, low moisture absorption, and inherent flexibility, as the dielectric substrate significantly reduces the inhibitory effect of the dielectric dissipation factor on radiation efficiency in high-frequency bands. The antenna maintains superior energy radiation efficiency to that of PCB substrates above 7 GHz, and with a total laminate thickness of 0.6 mm, achieves a low profile superior to traditional PCB antennas. This ultra-thin substrate, combined with copper reduction in the flexible bending areas, ensures that the antenna maintains structural integrity and consistent electrical performance even when folded, bent, mounted, or attached to complex curved surfaces, significantly expanding its flexibility in placement in wearable, embedded, and space-constrained devices.

[0022] Secondly, the present invention successfully introduces two additional coupled resonant modes within a limited size by loading multiple metal strips and staggered metalized holes on the side of the radiation patch. 01 The main mode forms a three-mode synergy, thereby constructing a continuous impedance bandwidth covering 7.3 GHz–8.7 GHz. Compared with the traditional approach of relying on a single radiator or high-order edge modes to broaden the bandwidth, this multi-layer coupled mode design not only expands the operating frequency band, but also, thanks to the metal reflective ground and the composite edge-radiation mechanism of the slot, maintains a stable edge-radiation pattern across the entire broadband, avoiding the pattern distortion and gain mutation problems common in high-order modes. For positioning systems, this means balanced and consistent radiation coverage across all new national standard channels, thereby improving the positioning accuracy and reliability of time difference of arrival (TDoA) and angle of arrival (AoA) algorithms.

[0023] Thirdly, the semi-enclosed through-hole array and staggered blind / buried vias not only provide the strip structure with dual electrical length and metal sidewall shielding, reducing losses in the feeder radiation path, but also form a quasi-coaxial structure. Combined with a coplanar waveguide backfeed solution, SMT assembly and BTB terminal soldering can be completed on a single side, simplifying RF system integration and reducing coupling interference and processing difficulties caused by redundant wiring. The circuit layout of this invention fully complies with the requirements of panel-type processing and batch reflow, enabling the antenna to maintain low cost and high consistency during mass production, creating conditions for large-scale commercial deployment.

[0024] Finally, the combined characteristics of multi-mode broadband, high efficiency, and bendability make the present invention not only suitable for indoor centimeter-level real-time positioning scenarios, but also meet the performance and form requirements of future UWB in emerging applications such as low-power wearables, human gesture capture, and vehicle-mounted surround-view radar. Its side-beam stability and narrow lateral dimensions further reduce the electromagnetic sensitivity to the terminal's metal casing, display module, and battery layout, achieving "RF-structure" collaborative minimum coupling and improving the overall integration freedom. As a result, the present invention demonstrates a comprehensive effect that is significantly superior to existing technologies in terms of high-frequency loss control, broadband mode expansion, stable radiation field shape, ultra-thin flexible mechanical properties, and mass production process compatibility, providing a practical solution for the next generation of high-precision, low-power, and form-friendly UWB positioning modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0026] Figure 1 is a top view of the overall structure of an antenna provided by one embodiment of the present invention;

[0027] Figure 2 This is a bottom view of the overall structure of the antenna provided by one embodiment of the present invention;

[0028] Figure 3 This is a stacking diagram of the overall structure of an antenna provided by an embodiment of the present invention;

[0029] Figure 4 1 is a schematic diagram of the structure of the antenna M1 layer provided by one embodiment of the present invention;

[0030] Figure 5 1 is a schematic diagram of the structure of the antenna M2 layer provided by one embodiment of the present invention;

[0031] Figure 6 1 is a schematic diagram of the structure of the antenna M3 layer provided by one embodiment of the present invention;

[0032] Figure 7 1 is a schematic diagram of the structure of the antenna M4 layer provided by one embodiment of the present invention;

[0033] Figure 8 1 is a schematic diagram of the structure of the antenna M5 layer provided by one embodiment of the present invention;

[0034] Figure 9 2 is a schematic diagram of the structure of the antenna M6 layer provided by one embodiment of the present invention;

[0035] Figure 10 2 is a schematic diagram of the structure of the antenna M7 layer provided by one embodiment of the present invention;

[0036] Figure 11 1 is a schematic diagram of electric field distribution in a first coupling mode provided by an embodiment of the present invention;

[0037] Figure 12 is a schematic diagram of the electric field distribution of the second coupling mode provided by an embodiment of the present invention;

[0038] Figure 13 This is a simulation of an antenna provided by an embodiment of the present invention. S 11 curve chart;

[0039] Figure 14 This is a simulated vertical radiation pattern of an antenna at 7.6 GHz provided by an embodiment of the present invention;

[0040] Figure 15 This is a simulated vertical radiation pattern of an antenna at 8.2 GHz provided by an embodiment of the present invention;

[0041] Figure 16 This is a simulated vertical radiation pattern of an antenna at 8.5 GHz provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without making creative efforts are all within the scope of protection of the present invention.

[0043] This embodiment provides an ultra-thin broadband UWB positioning antenna based on LCP material, such as Figures 1-3 As shown, it is mainly formed by laminating multiple layers of LCP single-sided board substrates. The corresponding metal layers from top to bottom are M1 to M7, and the top and bottom surfaces are covered with LPI layers. From the top view and bottom view, the antenna described in this embodiment is divided into a BTB (Board-to-Board) area (1), a flexible bending area (2) and a radiator area (3). Among them, the BTB area (1) and the radiator area (3) are both covered with LPI layers, and a terminal solder mask area is provided on the back of the BTB area (1) for welding the BTB terminals.

[0044] like Figures 4 to 10As shown, the structural schematic diagrams of each metal layer are given respectively. First, the M1 and M7 layers are provided with rectangular metal grounds (11, 71) corresponding to the BTB area (1), and the two are electrically connected through a semi-enclosed metalized through-hole array (12, 22, 32, 42, 52, 62, 72). The surrounding pattern of the through-hole array can be set according to the shape of the feed line (48) of the M4 layer. Secondly, on the left side of the antenna, there are three types of metal plane structures, one is the rectangular metal strips (13, 33, 53) of the M1, M3 and M5 layers, the second is the partially hollowed "Γ"-shaped metal strips (23, 63) of the M2 and M6 layers, and the third is the upper extended hollowed "Γ"-shaped metal strip (43) of the M4 layer. The three metal plane structures are electrically connected to the metal reflective ground (79) of the M7 layer through the interlayer staggered metalized blind holes (14, 74) and buried holes (24, 34, 44, 54, 64). Specifically, the arrangement of the metallized holes (14, 34, 54) is consistent, and the arrangement of the metallized holes (24, 44, 64, 74) is consistent. Both types of metallized holes are distributed along the edge of the feed line (48) and are staggered with each other. In addition, the "Γ"-shaped metal strips (23, 43, 63) are hollowed out corresponding to the flexible bending area (2) of the entire antenna, and the hollowed-out positions are distributed on both sides of the feed line (48). Furthermore, the upper edge of the upper extended hollow "Γ" shaped metal strip (43) is consistent with the upper edge of the rectangular metal ground (11, 71), and is also electrically connected to the metallized through-hole array (12, 22, 32, 42, 52, 62, 72). The feed line (48) is embedded therein and is semi-enclosed. One end is a feed blind hole, which is electrically connected to the coplanar waveguide feed line (78) of the M7 layer, and the other end is a feed through hole, which is electrically connected to the circular coupling patch (16) of the M1 layer and the circular hole ring (76) of the M7 layer. Finally, gaps are left between the rectangular radiation patch (15) and the circular coupling patch (16) on the M1 layer, and between the metal reflection ground (79) and the circular hole ring (76) on the M7 layer. The former provides a capacitive coupling component, and the latter prevents the feed through hole from short-circuiting.

[0045] For the antenna described in this embodiment, the signal enters from the coplanar waveguide feeder (78) on the back side, is transmitted along the feed blind hole to the feeder (48) of the M4 layer, and then, under the action of the semi-enclosed metallized through-hole array (12, 22, 32, 42, 52, 62, 72), the multiple metal strip structure (13, 23, 33, 43, 53, 63) and the staggered metallized holes (14, 24, 34, 44, 54, 64, 74), part of it is coupled into the multiple metal strip structure, and part of it is coupled along the feeder (48) to the feed through hole, and finally the rectangular radiating patch (15) is excited by the circular coupling patch (16), thereby realizing a broadband UWB positioning antenna with stable side-emitting characteristics.

[0046] In this process, the multiple metal strip structures (13, 23, 33, 43, 53, 63) loaded by the staggered metalized holes (14, 24, 34, 44, 54, 64, 74) can couple energy from the microstrip signal transmission process of the feed line (48) and form a resonant structure with the metal reflection ground (79), generating a TM with an operating frequency at the rectangular radiation patch (15). 01 The two new resonant modes near the mode play a key role in expanding the working bandwidth of the antenna. Specifically, Figure 11 and Figure 12 As shown in the figure, schematic diagrams of the electric field distribution of the two new resonant modes are given respectively. The first resonant mode is mainly distributed in the LCP substrate between M1 and M2, M3 and M4, and M5 and M6. The second resonant mode is mainly distributed in the LCP substrate between M2 and M3, M4 and M5, and M6 and M7. There are two main reasons why the multiple metal strip structures (13, 23, 33, 43, 53, 63) can generate two resonant modes. First, the ultra-thin substrate properties of LCP are utilized to design planar metal strip structures in each metal layer, which easily generates a coupled electric field in the z direction. Second, the addition of staggered metalized vias (14, 24, 34, 44, 54, 64, 74) can control the multiple metal strip structures (13, 23, 33, 43, 53, 63) to have two different vertical electrical lengths, corresponding to two resonant modes with different frequencies. Since there is no metallized hole on the lower right side of each metal strip structure (13, 23, 33, 43, 53, 63), and there is an air gap between the rectangular metal strip (13) and the rectangular radiation patch (15) on the right, the two resonant modes can share the gap for radiation. Under the action of the metal reflector (79), the radiation form is side emission, which is consistent with the TM of the rectangular radiation patch (15). 01 The radiation patterns of the modes are consistent, so the antenna can maintain stable side-radiation characteristics while adding two working modes to expand the bandwidth.

[0047] In addition to increasing the working mode, the multiple metal strip structures (13, 23, 33, 43, 53, 63) are designed to reduce copper in the flexible bending area (2) of the antenna, which is reflected in the partial hollowing and partial opening. On the one hand, the metal strips (13, 33, 53) are not extended in the flexible bending area (2), and are all partially open with the M7 layer metal. The metal strips (23, 63) are partially extended in the flexible bending area (2) to form a "Γ" shape structure, and the metal strip (43) is also a "Γ" shape structure, further extended and flush with the rectangular metal ground (11, 71), semi-enclosing the feed line (48) to ensure the transmission stability of the feed line (48) in the M4 layer; on the other hand, the metal strips (23, 43, 63) are partially hollowed on both sides of the flexible bending area (2) with the feed line (48) as the dividing line. The shape and number of the hollowing depend on the width, and can be rectangular, triangular or circular. Through the above-mentioned partial hollowing and partial opening process, the amount of copper in the flexible bending area (2) is effectively reduced, and this area is not covered with the LPI layer, and the thickness is further reduced, which is conducive to improving the flexible bending ability of the antenna and adapting to the internal space of the terminal.

[0048] In addition, the multiple metal strip structures (13, 23, 33, 43, 53, 63) are loaded with staggered metallized holes (14, 24, 34, 44, 54, 64, 74) and semi-enclosed metallized through-hole arrays (12, 22, 32, 42, 52, 62, 72), respectively. The former forms a metal side wall structure, and the latter forms a quasi-coaxial structure, which can reduce the loss during energy transmission and improve antenna efficiency.

[0049] Thanks to the aforementioned working mechanism, the multiple metal strip structures (13, 23, 33, 43, 53, 63) and staggered plated-through holes (14, 24, 34, 44, 54, 64, 74) contribute significantly to the antenna's multimode bandwidth expansion, sideways stability, and efficient radiation. This enables both broadband operation and stable sideways characteristics across a wide bandwidth. Furthermore, the partially hollowed-out and partially open design in specific areas enhances the antenna's flexibility and bendability. The antenna's overall structure is simple, compact, lightweight, and planar. The LPI solder mask on the backside accommodates the BTB terminals, ensuring mass production and excellent production stability.

[0050] The antenna in this embodiment has 7 layers of LCP substrate, each layer is provided with a corresponding metal layer, and the overall thickness of the antenna after lamination is only 0.593mm. Figure 13 As shown in the figure, the antenna achieves broadband operation, with a -6dB matching bandwidth covering 7.29~8.66 GHz and a bandwidth of up to 1370MHz, supporting the CH9 (standard bandwidth: 499.2MHz) and CH11 (large bandwidth: 1331.2MHz) frequency bands in the new national standard. Figures 14-16The vertical plane simulation patterns of the antenna at 7.6 GHz, 8.2 GHz and 8.5 GHz are shown respectively. It can be seen from the figures that the antenna can achieve stable sideways radiation characteristics within the operating frequency.

[0051] In summary, the key point of the antenna of the present invention is to load multiple metal strip structures and staggered metallized holes on the side of the rectangular radiation patch, generate two interlayer resonance modes with different frequencies by coupling the feed line energy, and use gaps and reflections to achieve side radiation, thereby forming a wide-band working frequency band with three resonance points. At the same time, the side radiation characteristics within the wide band remain stable, and the advantages of flexible bending are achieved by partially hollowing out and partially opening the design for specific areas. The overall radiation efficiency of the antenna is high, it is light, thin and compact, and has good production stability.

[0052] Specifically:

[0053] (1) Multiple metal strip structures and staggered metalized holes are loaded on the side of the rectangular radiating patch. Two interlayer resonance modes with different frequencies are generated by coupling the feed line energy, and side radiation is achieved by using gaps and reflections, thereby forming a broadband working frequency band with three resonance points. At the same time, the side radiation characteristics within the broadband remain stable.

[0054] (2) The staggered metalized holes are divided into metalized blind holes and metalized buried holes. They are staggered along one side of the feeder (y direction) between the layers of the multiple metal strip structures and are electrically connected to the metal reflective ground. They can not only construct multi-layer zero electric field regions of different lengths, so that the coupled electric field produces two resonant modes with different operating frequencies, thereby expanding the working bandwidth of the antenna, but also form a metal side wall structure, reduce the loss during feeder transmission, and improve antenna efficiency.

[0055] (3) Multiple metal strip structures are distributed in each metal layer. The ultra-thin characteristics of the LCP substrate are used to easily couple energy from the feed line to generate an electric field in the z direction, and form an air gap with the rectangular radiation patch on the left, so that the coupled electric field can also form side-emitting radiation under the action of the metal reflection ground, and the rectangular patch TM 01 The radiation characteristics of the modes are consistent, thus achieving the advantage of stable radiation within a wide frequency band.

[0056] (4) The multiple metal strip structures are partially hollowed out and partially open in specific areas, that is, the rectangular metal strip is partially open, and the "Γ"-shaped metal strip is partially hollowed out on both sides of the feeder. The shape and number of the hollowing depend on the width, and can be rectangular, triangular or circular, etc., which effectively reduces the amount of copper in this area. In addition, this area is not covered by the LPI layer, and the thickness is further reduced, which is conducive to improving the flexible bending ability of the antenna and adapting to the internal space of the terminal.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of this application.

Claims

1. A UWB positioning antenna based on LCP material, characterized in that: The metal layers M1 to M7 are arranged in sequence from top to bottom. The metal layers are all based on the LCP single-sided board and include a BTB area, a flexible bending area and a radiator area adjacent to each other in sequence. The metal layer M1 and the metal layer M7 are provided with metal grounds (11, 71) corresponding to the BTB region, and the metal grounds (11, 71) and corresponding positions of the metal layers M2 to M6 are provided with metallized through-hole arrays (12, 22, 32, 42, 52, 62, 72), and the metal layer M1 and the metal layer M7 are electrically connected via the metallized through-hole arrays; Metal plane structures are provided on the metal layers M1 to M6, and the metal plane structures on each metal layer are electrically connected to the metal reflective ground (79) of the metal layer M7 through interlayer staggered metalized blind holes / buried holes; the metal plane structure on the metal layer M4 is electrically connected to the metalized through-hole array (12, 22, 32, 42, 52, 62, 72); A feed line (48) is also provided on the metal layer M4, one end of the feed line (48) is electrically connected to a coplanar waveguide feed line (78) provided on the metal layer M7 through corresponding feed blind holes provided on the metal layers M4 to M6, and the other end of the feed line (48) is electrically connected to a coupling patch (16) provided on the radiator region of the metal layer M1 and an annular ring (76) provided on the radiator region of the metal layer M7 through corresponding feed through holes provided on the metal layers M1 to M6; A radiation patch (15) is further provided on the periphery of the coupling patch (16) of the metal layer M1, and a gap for providing a coupling component is left between the radiation patch (15) and the coupling patch (16); and a gap for preventing a short circuit of the feed through hole is left between the metal reflection ground (79) of the metal layer M7 and the hole ring (76) provided therein.

2. The UWB positioning antenna according to claim 1, wherein: The metal plane structure provided on the radiator regions of the metal layers M1, M3 and M5 and the metal reflective ground (79) of the radiator region of the metal layer M7 do not extend into the flexible bending region, and the metal plane structure provided on the radiator regions of the metal layers M2, M4 and M6 extending into the flexible bending region is hollowed out.

3. The UWB positioning antenna according to claim 2, wherein: The metal plane structures provided on the metal layers M1, M3 and M5 are rectangular metal strips (13, 33, 53); the metal plane structures provided on the metal layers M2, M4 and M6 are partially hollowed-out "Γ"-shaped metal strips (23, 43, 63), the hollowed-out portions corresponding to the flexible bending regions.

4. The UWB positioning antenna according to claim 3, wherein: The upper edge of the "Γ"-shaped metal strip (43) provided on the metal layer M4 is flush with the upper edges of the metal grounds (11, 71) on the metal layers M1 and M7.

5. The UWB positioning antenna according to claim 1, wherein: The metal plane structures of the metal layers M1 and M7 are provided with metalized blind holes (14, 74), and the metal plane structures of the metal layers M2 to M6 are provided with metalized buried holes (24, 34, 44, 54, 64); the arrangement of the metalized blind holes (14) and the metalized buried holes (34, 54) is consistent, while the arrangement of the metalized buried holes (24, 44, 64) and the metalized blind holes (74) is consistent, and the relative positions of the metalized blind holes / buried holes are staggered between adjacent metal layers.

6. The UWB positioning antenna according to claim 1, wherein: One end of the feed line (48) is embedded in the metallized through hole array (42) and is semi-surrounded by the metallized through hole array (42).

7. The UWB positioning antenna according to claim 1, wherein: The BTB area and radiator area on the top and bottom surfaces of the antenna are covered with LPI layers, while the flexible bending area has no LPI layer; the BTB area on the bottom surface of the antenna is also provided with a terminal solder resist area for welding the BTB terminals.

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