A sheet metal antenna of UWB and internet of things equipment

Abstract

The application relates to the technical field of antennas, and provides a UWB positioning sheet metal antenna and an Internet of Things device, wherein the UWB positioning sheet metal antenna comprises a first antenna radiator unit, a second antenna radiator unit and a metal ground which are integrally formed by sheet metal, further comprises a first radio frequency coaxial transmission line and a second radio frequency coaxial transmission line, in use, the UWB positioning sheet metal antenna is fixed in the interior of the device through the positioning hole and the screw hole on the metal ground, the radio frequency coaxial transmission line transmits a UWB signal to the circular arc short groove on the antenna radiator unit, and the antenna radiator unit converts a current signal into an electromagnetic wave signal and transmits the electromagnetic wave signal to the free space. The UWB positioning sheet metal antenna provided by the application has the advantages of small space occupation, convenient assembly and disassembly, small antenna loss, high radiation efficiency, stable signal radio frequency and accurate positioning.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a UWB sheet metal antenna and an Internet of Things device. BACKGROUND

[0002] Ultra-Wide Band (UWB) technology is a new wireless carrier communication technology that is very different from traditional communication technology. It does not need to use the carrier in the traditional communication system, but transmits data by sending and receiving non-sinusoidal wave extremely narrow pulses of nanoseconds or below. Therefore, it has a very wide frequency spectrum range with a bandwidth of GHz. In addition, UWB technology has the advantages of low system complexity, low transmitted signal power spectrum density, insensitivity to channel fading, low interception ability, high positioning accuracy, etc., and is especially suitable for high-speed wireless access in dense multipath places such as indoors.

[0003] The UWB communication link positioning system includes UWB anchors and UWB tags. The UWB tags mainly exist in objects that need to move, and the UWB anchors exist in relatively fixed devices that do not need to move frequently, which are equivalent to the base station end in the communication system. If UWB anchors are separately established on a large scale, the use cost of the UWB positioning scheme will be greatly increased, which will affect the popularization rate. Therefore, the popularization of indoor positioning cannot be separated from the update and upgrade of basic equipment. Many enterprises have begun to focus on wireless routers, 5GCPE and other devices. If the UWB positioning system is integrated into these Internet of Things basic devices, the research and development cost will be greatly saved, and the layout and application of the UWB indoor positioning ecosystem will be accelerated.

[0004] However, when the UWB positioning system is integrated into these Internet of Things basic devices, factors such as the size of the space occupied by the UWB antenna, the convenience of assembly and disassembly, the loss of the antenna, the radiation efficiency, the signal radio frequency stability, and the positioning accuracy of the Internet of Things device need to be considered. SUMMARY

[0005] In order to solve the problems of the existing UWB antenna, such as large space occupation, inconvenient assembly and disassembly, high antenna loss, low radiation efficiency, poor signal radio frequency stability, and low positioning accuracy, the present application provides a UWB sheet metal antenna and an Internet of Things device.

[0006] In one aspect, the present application provides a UWB positioning sheet metal antenna, which comprises a first antenna radiator unit, a second antenna radiator unit and a metal ground formed integrally by sheet metal, and further comprises a first radio frequency coaxial transmission line and a second radio frequency coaxial transmission line.

[0007] The first antenna radiator unit and the second antenna radiator unit are vertically arranged on the same side of the metal ground in the same direction.

[0008] The first antenna radiator unit is in the shape of an inverted L, a first radiator slot is arranged at the bending part of the inverted L and close to the metal ground, a first short circular-arc groove is arranged on one side of the first radiator slot, and a first long circular-arc groove is arranged on the other side of the first radiator slot, the first short circular-arc groove is close to the radiation surface, the first long circular-arc groove is close to the metal ground, and the first short circular-arc groove and the first long circular-arc groove are aligned.

[0009] One end of the first radio frequency coaxial transmission line exposes a first inner conductor core and a first ground outer conductor, the first ground outer conductor is wrapped outside the first inner conductor core, the first short circular-arc groove is connected with the first inner conductor core to serve as a feeding point of the antenna, and the first long circular-arc groove is connected with the first ground outer conductor to serve as a grounding point of the antenna.

[0010] The second antenna radiator unit is in the shape of an inverted L, a second radiator slot is arranged at the bending part of the inverted L and close to the metal ground, a second short circular-arc groove is arranged on one side of the second radiator slot, and a second long circular-arc groove is arranged on the other side of the second radiator slot, the second short circular-arc groove is close to the radiation surface, the second long circular-arc groove is close to the metal ground, and the second short circular-arc groove and the second long circular-arc groove are aligned.

[0011] One end of the second radio frequency coaxial transmission line exposes a second inner conductor core and a second ground outer conductor, the second ground outer conductor is wrapped outside the second inner conductor core, the second short circular-arc groove is connected with the second inner conductor core to serve as a feeding point of the antenna, and the second long circular-arc groove is connected with the second ground outer conductor to serve as a grounding point of the antenna.

[0012] Optionally, the first antenna radiator unit and the second antenna radiator unit are in the same plane, and the distance therebetween is 0.45-0.5 times the wavelength of the radiated wave.

[0013] Optionally, one end of the metal ground further comprises a first positioning hole and a first screw hole, and the other end further comprises a second positioning hole and a second screw hole.

[0014] The first positioning hole and the second positioning hole are used for connecting a positioning column inside the device, and the first screw hole and the second screw hole are used for connecting a metal ground screw hole on the device through a screw.

[0015] Optionally, the metal ground further comprises a first metal clamping groove, a second metal clamping groove, a third metal clamping groove, and a baffle.

[0016] The first metal clamping groove is used for fixing the first radio frequency coaxial transmission line, the second metal clamping groove and the third metal clamping groove are opposite in opening direction, the second metal clamping groove and the third metal clamping groove are used for fixing the second radio frequency coaxial transmission line, the baffle is located on the inner side of the second radio frequency coaxial transmission line, and is located on opposite sides of the first antenna radiator unit.

[0017] Optionally, a first fixed outer conductor is further arranged on the first radio frequency coaxial transmission line, and the first fixed outer conductor is connected with the first metal clamping groove.

[0018] A second fixed outer conductor is further arranged on the second radio frequency coaxial transmission line, and the second fixed outer conductor is connected with the second metal clamping groove and the third metal clamping groove respectively.

[0019] Optionally, a first radio frequency connector is further arranged on the other end of the first radio frequency coaxial transmission line relative to the first inner conductor core, and the first radio frequency connector is used for connecting a UWB chip module.

[0020] A second radio frequency connector is further arranged on the other end of the second radio frequency coaxial transmission line relative to the second inner conductor core, and the second radio frequency connector is used for connecting a UWB chip module.

[0021] Optionally, a first insulating medium layer is further arranged close to the first inner conductor core, the first insulating medium layer is tightly attached to the inner layer of the first ground outer conductor, an exposed part of the first insulating medium layer is located between the first inner conductor core and the first ground outer conductor, and spans the first radiator gap.

[0022] A second insulating medium layer is further arranged close to the second inner conductor core, the second insulating medium layer is tightly attached to the inner layer of the second ground outer conductor, an exposed part of the second insulating medium layer is located between the second inner conductor core and the second ground outer conductor, and spans the second radiator gap.

[0023] Optionally, a first insulating protective layer and a first metal wire clamp are further arranged on the first radio frequency coaxial transmission line, the first insulating protective layer is arranged on the outer layer of the first radio frequency coaxial transmission line, and the first metal wire clamp is used for being fixed on a metal ground of equipment.

[0024] A second insulating protective layer and a second metal wire clamp are further arranged on the second radio frequency coaxial transmission line, the second insulating protective layer is arranged on the outer layer of the second radio frequency coaxial transmission line, and the second metal wire clamp is used for being fixed on a metal ground of equipment.

[0025] Optionally, the first radio frequency coaxial transmission line is further provided with a first metal conductive cloth, the first metal conductive cloth is close to the first radio frequency connector and is at the same end, a part of the first metal conductive cloth is wrapped around and attached to the outer conductor of the first radio frequency coaxial transmission line and is electrically connected to the outer conductor, and the other part of the first metal conductive cloth can be attached to the metal ground of the PCB mainboard to filter out signal interference on the PCB mainboard.

[0026] The second radio frequency coaxial transmission line is further provided with a second metal conductive cloth, the second metal conductive cloth is close to the second radio frequency connector and is at the same end, a part of the second metal conductive cloth is wrapped around and attached to the outer conductor of the second radio frequency coaxial transmission line and is electrically connected to the outer conductor, and the other part of the second metal conductive cloth can be attached to the metal ground of the PCB mainboard to filter out signal interference on the PCB mainboard.

[0027] Another aspect of the present application provides an Internet of Things device comprising the UWB positioning sheet metal antenna.

[0028] According to the above technical scheme, the application provides a sheet metal antenna for UWB positioning and an Internet of Things device, wherein the sheet metal antenna for UWB positioning comprises a first antenna radiator unit, a second antenna radiator unit and a metal ground formed integrally by sheet metal, and further comprises a first radio frequency coaxial transmission line and a second radio frequency coaxial transmission line. The first antenna radiator unit and the second antenna radiator unit are vertically arranged on the same side of the metal ground in the same direction. The first antenna radiator unit is in the shape of an inverted L, and a first radiator gap is arranged at the bending part of the inverted L and close to the metal ground. A first short circular-arc groove is arranged on one side of the first radiator gap, and a first long circular-arc groove is arranged on the other side of the first radiator gap. The first short circular-arc groove is close to the radiation surface, and the first long circular-arc groove is close to the metal ground. The slot of the first short circular-arc groove is aligned with the slot of the first long circular-arc groove. One end of the first radio frequency coaxial transmission line is exposed to a first inner conductor core wire and a first ground outer conductor. The first ground outer conductor is wrapped outside the first inner conductor core wire. The first short circular-arc groove is connected with the first inner conductor core wire to serve as a feed point of the antenna. The first long circular-arc groove is connected with the first ground outer conductor to serve as a grounding point of the antenna. The second antenna radiator unit is in the shape of an inverted L, and a second radiator gap is arranged at the bending part of the inverted L and close to the metal ground. A second short circular-arc groove is arranged on one side of the second radiator gap, and a second long circular-arc groove is arranged on the other side of the second radiator gap. The second short circular-arc groove is close to the radiation surface, and the second long circular-arc groove is close to the metal ground. The slot of the second short circular-arc groove is aligned with the slot of the second long circular-arc groove. One end of the second radio frequency coaxial transmission line is exposed to a second inner conductor core wire and a second ground outer conductor. The second ground outer conductor is wrapped outside the second inner conductor core wire. The second short circular-arc groove is connected with the second inner conductor core wire to serve as a feed point of the antenna. The second long circular-arc groove is connected with the second ground outer conductor to serve as a grounding point of the antenna.

[0029] In actual application, the application provides a sheet metal antenna for UWB and an Internet of Things device. In use, the sheet metal antenna for UWB is fixed in the device through the positioning hole and the screw hole on the metal ground. The radio frequency coaxial transmission line transmits the UWB signal to the short circular-arc groove on the antenna radiator unit. The antenna radiator unit converts the current signal into an electromagnetic wave signal and transmits the electromagnetic wave signal to the free space. The sheet metal antenna for UWB provided by the application occupies a small space of the Internet of Things device, is convenient to assemble and disassemble, has small antenna loss, high radiation efficiency, stable signal radio frequency and accurate positioning. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0031] Figure 1 A three-dimensional view of the sheet metal antenna for the Internet of Things UWB provided by the embodiment of the present application;

[0032] Figure 2 A bottom two-dimensional view of the sheet metal antenna for the Internet of Things UWB provided by the embodiment of the present application;

[0033] Figure 3 A back two-dimensional view of the sheet metal antenna for the Internet of Things UWB provided by the embodiment of the present application;

[0034] Figure 4 A schematic diagram of the body of the antenna provided by the embodiment of the present application;

[0035] Figure 5 A schematic diagram of the radio frequency coaxial transmission line provided by the embodiment of the present application;

[0036] Figure 6 A return loss curve schematic diagram of the antenna body provided by the embodiment of the present application;

[0037] Figure 7 A current flow diagram of the antenna body when excited by a signal provided by the embodiment of the present application;

[0038] Figure 8 A three-dimensional view of the antenna as a whole after simple deformation of the sheet metal antenna for the Internet of Things UWB based on the Figure 1 embodiment of the present application.

[0039] In the drawings:

[0040] 1-first antenna radiator unit, 11-first radiator slot, 12-first short circular arc groove, 13-first long circular arc groove, 2-second antenna radiator unit, 21-second radiator slot, 22-second short circular arc groove, 23-second long circular arc groove, 3-metal ground, 31-first positioning hole, 32-first screw hole, 33-second positioning hole, 34-second screw hole, 35-first metal clamping groove, 36-second metal clamping groove, 37-third metal clamping groove, 38-baffle, 4-first radio frequency coaxial transmission line, 41-first radio frequency connector, 42-first inner conductor core wire, 43-first insulating dielectric layer, 44-first grounding outer conductor, 45-first fixed outer conductor, 46-first insulating protective layer, 47-first metal wire clamp, 48-first metal conductive cloth, 5-second radio frequency coaxial transmission line, 51-second radio frequency connector, 52-second inner conductor core wire, 53-second insulating dielectric layer, 54-second grounding outer conductor, 55-second fixed outer conductor, 56-second insulating protective layer, 57-second metal wire clamp, 58-second metal conductive cloth. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] Reference Figure 1 A three-dimensional view of the sheet metal antenna for the Internet of Things UWB provided by the embodiments of the present application is provided. Figure 2 A bottom two-dimensional view of the sheet metal antenna for the Internet of Things UWB provided by the embodiments of the present application is provided. Figure 3 A back two-dimensional view of the sheet metal antenna for the Internet of Things UWB provided by the embodiments of the present application is provided. Figure 4 A schematic diagram of the body of the antenna provided by the embodiments of the present application is provided. Figure 5 A schematic diagram of the radio frequency coaxial transmission line provided by the embodiments of the present application is provided.

[0043] The embodiments of the present application provide a sheet metal antenna for UWB, which comprises: a first antenna radiator unit 1, a second antenna radiator unit 2 and a metal ground 3 integrally formed by sheet metal, and further comprises a first radio frequency coaxial transmission line 4 and a second radio frequency coaxial transmission line 5.

[0044] The first antenna radiator unit 1 and the second antenna radiator unit 2 are vertically arranged on the same side of the metal ground 3 in the same direction.

[0045] The first antenna radiator unit 1 is in the shape of an inverted L, a first radiator slot 11 is arranged at the bending part of the inverted L and close to the metal ground 3, a first short circular-arc groove 12 is arranged on one side of the first radiator slot 11, and a first long circular-arc groove 13 is arranged on the other side, the first short circular-arc groove 12 is close to the radiation surface, the first long circular-arc groove 13 is close to the metal ground 3, and the first short circular-arc groove 12 and the first long circular-arc groove 13 are aligned.

[0046] One end of the first radio frequency coaxial transmission line 4 exposes a first inner conductor core wire 42 and a first ground outer conductor 44, the first ground outer conductor 44 is wrapped outside the first inner conductor core wire 42, the first short circular-arc groove 12 is connected with the first inner conductor core wire 42 to serve as a feeding point of the antenna, and the first long circular-arc groove 13 is connected with the first ground outer conductor 44 to serve as a grounding point of the antenna.

[0047] The second antenna radiator unit 2 is in the shape of an inverted L, a second radiator slot 21 is arranged at the bending part of the inverted L and close to the metal ground 3, a second short circular-arc groove 22 is arranged on one side of the second radiator slot 21, and a second long circular-arc groove 23 is arranged on the other side, the second short circular-arc groove 22 is close to the radiation surface, the second long circular-arc groove 23 is close to the metal ground 3, and the second short circular-arc groove 22 and the second long circular-arc groove 23 are aligned.

[0048] One end of the second radio frequency coaxial transmission line 5 exposes a second inner conductor core wire 52 and a second ground outer conductor 54, the second ground outer conductor 54 is wrapped outside the second inner conductor core wire 52, the second short circular-arc groove 22 is connected with the second inner conductor core wire 52 to serve as a feeding point of the antenna, and the second long circular-arc groove 53 is connected with the second ground outer conductor 54 to serve as a grounding point of the antenna.

[0049] The first antenna radiator unit 1, the second antenna radiator unit 2 and the metal ground 3 in the embodiment of the application are made by sheet metal technology and have the same metal thickness, the sheet metal technology is a comprehensive cold working process for metal sheets, including cutting, punching, shearing, compounding, folding, riveting, splicing and forming, and the significant feature is that the metal thickness is consistent and controllable in one-piece forming, and the antenna structure is reliable in strength and not easy to deform. Therefore, the antenna in the embodiment of the application does not need a plastic support, compared with other processes such as laser engraving plating forming on special plastic materials, the difficulty of the scheme is low, the material cost can be saved, a plastic support is not needed, air is used as a dielectric material, the dielectric loss of air is about 0, and therefore the antenna loss can be reduced and the antenna radiation efficiency can be improved.

[0050] In addition, the first antenna radiator unit 1 and the second antenna radiator unit 2 are both vertically arranged on the same side of the metal ground 3, and the radiation surfaces thereof are L-shaped relative to the metal ground 3, so that the space occupied by the UWB antenna on the horizontal plane of the device can be greatly reduced.

[0051] The first radiator slot 11 and the second radiator slot 21 function to adjust the input impedance of the antenna to improve the radiation efficiency. The circular-arc-shaped grooves formed on the first antenna radiator unit 1 and the second antenna radiator unit 2 are aligned with the first circular-arc short groove 12 and the first circular-arc long groove 13, and the first circular-arc short groove 12 and the first circular-arc long groove 13 are connected with the first radiator slot 11; the second circular-arc short groove 22 and the second circular-arc long groove 23 are aligned with each other, and the second circular-arc short groove 22 and the second circular-arc long groove 23 are connected with the second radiator slot 21, so that the circular-arc-shaped grooves are just fitted with the outer shape of the radio frequency coaxial transmission line. The radio frequency coaxial transmission line is fixed on the radiator by welding at the circular-arc-shaped grooves, and has stronger bonding force relative to the radio frequency coaxial transmission line which is directly welded on the surface of the radiator without designing the grooves.

[0052] Further, the first antenna radiator unit 1 and the second antenna radiator unit 2 are in the same plane, and the distance therebetween is 0.45-0.5 times the wavelength of the radiation wave. The first antenna radiator unit 1 and the second antenna radiator unit 2 are located on the same axis, and relative to the completely axisymmetric placement, the isolation between the two radiator units is improved. The distance between the first antenna radiator unit 1 and the second antenna radiator unit 2 is specifically the edge-to-edge distance D (equivalent to the distance between the phase centers of the two antenna radiator units). The working frequency band of the antenna of the embodiment is set to the Channel 5 channel (6240 MHz-6739.2 MHz) in the UWB frequency band, and the distance D is slightly smaller than half the wavelength of the highest frequency, and the preferred value is 20.5 mm. From the perspective of phase, the half wavelength is 180°, and if it is greater than the half wavelength, the AOA (Angle Of Arrival, angle of arrival) algorithm used by the UWB system to calculate the azimuth will appear positioning ambiguity. Therefore, too far distance is not conducive to accurate positioning, and too close distance between the two antenna radiators is prone to radiation interference, and slightly smaller than half the wavelength is a better choice. The highest frequency of the embodiment is 6739.2 MHz, and the corresponding half wavelength in the air is 22.25 mm. The value of D in the embodiment is 20.5 mm, which can improve the accuracy of positioning while ensuring the isolation.

[0053] Further, one end of the metal ground 3 is also provided with a first positioning hole 31 and a first screw hole 32, and the other end is provided with a second positioning hole 33 and a second screw hole 34. The first positioning hole 31 and the second positioning hole 33 are used to connect the positioning column inside the device, and the first screw hole 32 and the second screw hole 34 are used to connect the metal ground screw hole on the device through the screw. When the antenna is assembled with the device, first, the first positioning hole 31 and the second positioning hole 33 are aligned with the positioning column inside the device, and then the first screw hole 32 and the second screw hole 34 on the common metal ground 3 are automatically aligned with the metal ground screw hole on the device. By screwing the metal screw, the antenna can be fixed and connected with the metal ground of the whole device, and the assembly and disassembly are very convenient.

[0054] Further, the metal ground 3 is also provided with a first metal clamping groove 35, a second metal clamping groove 36, a third metal clamping groove 37 and a baffle 38. The first metal clamping groove 35 is used to fix the first radio frequency coaxial transmission line 4, the second metal clamping groove 36 and the third metal clamping groove 37 are opposite in opening direction, and the second metal clamping groove 36 and the third metal clamping groove 37 are used to fix the second radio frequency coaxial transmission line 5. The baffle 38 is located on the inner side of the second radio frequency coaxial transmission line 5 and on the opposite side of the first antenna radiator unit 1.

[0055] Further, the first radio frequency coaxial transmission line 4 is also provided with a first fixed outer conductor 45, and the first fixed outer conductor 45 is connected with the first metal clamping groove 35. The second radio frequency coaxial transmission line 5 is also provided with a second fixed outer conductor 55, and the second fixed outer conductor 55 is connected with the second metal clamping groove 36 and the third metal clamping groove 37 respectively. The fixed outer conductor is welded on the metal clamping groove, which not only can fix the radio frequency transmission line, but also can increase the stability of the radio frequency coaxial transmission line.

[0056] Further, the first radio frequency connector 41 is arranged on the other end of the first radio frequency coaxial transmission line 4 relative to the first inner conductor core wire 42, and the first radio frequency connector 41 is used to connect the UWB chip module. The second radio frequency connector 51 is arranged on the other end of the second radio frequency coaxial transmission line 5 relative to the second inner conductor core wire 52, and the second radio frequency connector 51 is used to connect the UWB chip module. The filling medium in the first radio frequency connector 41 and the second radio frequency connector 51 and the insulating layer medium in the radio frequency coaxial transmission line are all made of high-frequency low-loss material, and more preferably, the high-frequency low-loss material is PTFE (polytetrafluoroethylene), which can meet the working frequency within 10GHz. The first radio frequency connector 41 and the second radio frequency connector 51 are buckled on the PCB mainboard of the device in actual assembly and are electrically connected with the UWB chip module to transmit signals.

[0057] Further, a first insulating medium layer 43 is arranged close to the first inner conductor core wire 42, the first insulating medium layer 43 is close to the inner layer of the first ground outer conductor 44, the exposed part of the first insulating medium layer 43 is between the first inner conductor core wire 42 and the first ground outer conductor 44, and spans the first radiator slot 11.

[0058] A second insulating medium layer 53 is arranged close to the second inner conductor core wire 52, the second insulating medium layer 53 is close to the inner layer of the second ground outer conductor 54, the exposed part of the second insulating medium layer 53 is between the second inner conductor core wire 52 and the second ground outer conductor 54, and spans the second radiator slot 21.

[0059] Further, the first radio frequency coaxial transmission line 4 is further provided with a first insulating protective layer 46 and a first metal wire clamp 47, the first insulating protective layer 46 is arranged on the outer layer of the first radio frequency coaxial transmission line 4, and the first metal wire clamp 47 is used to be fixed on the metal ground of the equipment; the second radio frequency coaxial transmission line 5 is further provided with a second insulating protective layer 56 and a second metal wire clamp 57, the second insulating protective layer 56 is arranged on the outer layer of the second radio frequency coaxial transmission line 5, and the second metal wire clamp 57 is used to be fixed on the metal ground of the equipment. The first insulating protective layer 46 is the outermost layer of the first radio frequency coaxial transmission line 4 without stripping treatment; the second insulating protective layer 56 is the outermost layer of the second radio frequency coaxial transmission line 5 without stripping treatment. The metal wire clamp is an oval ring shape, and the shape can be adjusted according to the environment. When assembled, the first metal wire clamp 47 and the second metal wire clamp 57 can be fixed on the metal ground inside the equipment through metal screws, which can enhance the grounding property of the antenna and the whole equipment, and enhance the signal stability.

[0060] Referring to Figure 6 The return loss curve of the antenna body provided by the embodiment of the application is shown in the figure. The bandwidth of the return loss less than -10dB is more than 1000MHz, the bandwidth is wide, but the resonance point is about 7GHz (i.e. 7000MHz), which is not in the target range (6240MHz-6739.2MHz). The reason is that after the antenna is installed in the whole machine equipment, due to the complex metal environment around, the working frequency band of the antenna will shift to low frequency, and the total shift amount depends on the environment. The shift amount of the embodiment of the application is about 500MHz.

[0061] Referring to Figure 7This is a current flow diagram of the antenna body under signal excitation provided in this embodiment. The current mainly flows along the first antenna radiator element 1 and the second antenna radiator element 2, with the main direction being parallel to the horizontal plane. The current generates an electric field, which is in the same direction as the antenna. Therefore, the main polarization of the electromagnetic wave is horizontal linear polarization. In practical applications, when the UWB antenna of the tag device also radiates horizontally polarized waves, it can achieve the maximum transmission efficiency of the transmit / receive communication link. The current intensity on the metal ground 3 is relatively weak, and when electrically connected to the metal ground in the device, the intensity can be ignored.

[0062] See Figure 8 The embodiments provided in this application are based on Figure 1 The image shows a 3D model of a sheet metal antenna for the Internet of Things (UWB) after a simple deformation. Compared to... Figure 1 The antenna radiator element and the metal ground are in the same position. The positioning holes, screw holes, and metal slots for fixing the RF coaxial transmission lines on the metal ground 3 have been adjusted in position according to the specific internal environment of the equipment. The layout of the first RF coaxial transmission line 4 and the second RF coaxial transmission line 5 is similar to... Figure 1 There is a significant difference; the two are no longer run side by side, but are instead run at a certain distance apart, just like the antenna radiator unit.

[0063] Furthermore, a first conductive metal cloth 48 is also provided on the first RF coaxial transmission line 4. The first conductive metal cloth 48 is close to the first RF connector 41 and located at the same end. A portion of the first conductive metal cloth 48 is wrapped around and attached to the outer conductor of the first RF coaxial transmission line 4, and is electrically connected to the outer conductor. Another portion can be attached to the metal ground of the PCB motherboard to filter out signal interference on the PCB motherboard. A second conductive metal cloth 58 is also provided on the second RF coaxial transmission line 5. The second conductive metal cloth 58 is close to the second RF connector 51 and located at the same end. A portion of the second conductive metal cloth 58 is wrapped around and attached to the outer conductor of the second RF coaxial transmission line 5, and is electrically connected to the outer conductor. Another portion can be attached to the metal ground of the PCB motherboard to filter out signal interference on the PCB motherboard. Figure 8 In the process, the first RF coaxial transmission line 4 and the second RF coaxial transmission line 5 have metal conductive cloth added near the connectors, the first RF connector 41 and the second RF connector 51. Part of the metal conductive cloth is wrapped around and attached to the outer conductor of the RF coaxial transmission line and electrically connected to it, while the other part can be attached to the metal ground of the PCB motherboard to filter out possible signal interference on the PCB motherboard.

[0064] It should be noted that the positioning hole, screw hole on the common metal ground 3 and the metal clamping slot of the fixed radio frequency coaxial transmission line can be adjusted in position according to the specific environment inside the device, and the shape and size can also be adjusted according to the actual installation needs. These adjustments are directly known to those skilled in the art. The distance between the first radio frequency coaxial transmission line 4 and the second radio frequency coaxial transmission line 5 is not limited, and can be fine-tuned according to the environment of the device, or designed and adjusted according to the layout of the UWB chip module on the mainboard. Figure 1 and Figure 8 The first radio frequency coaxial transmission line 4 and the second radio frequency coaxial transmission line 5 in the above embodiment are parallel to each other.

[0065] In addition, the working frequency band of the above embodiment only covers channel 5 channel, and the antenna radiator unit can be improved as needed, such as adding a parasitic branch to increase coverage of other channel frequency bands, such as synchronously implementing channel channel 9 (7737.6MHz-8236.8MHz). It is within the understanding of those skilled in the art to make routine modifications or equivalent replacements. These routine modifications and replacements still belong to the protection scope of the embodiments of the present application.

[0066] The second aspect of the embodiments of the present application provides a kind of Internet of Things equipment, it contains the sheet metal antenna of the UWB positioning provided in the embodiments of the present application.

[0067] It should be noted that the "device" involved in the embodiments of the present application is an Internet of Things device, which is basically a smart device, supports Internet connection, and can interact with other devices through the Internet. According to the need, the user is granted remote access permission to manage the device, which specifically includes: wireless router, 5GCPE and other devices.

[0068] According to the technical scheme, the embodiment of the present application provides a sheet metal antenna of UWB and an Internet of Things device. The sheet metal antenna of UWB comprises a first antenna radiator unit 1, a second antenna radiator unit 2 and a metal ground 3 which are integrally formed by sheet metal, and further comprises a first radio frequency coaxial transmission line 4 and a second radio frequency coaxial transmission line 5. The first antenna radiator unit 1 and the second antenna radiator unit 2 are vertically arranged on the same side of the metal ground 3 in the same direction. The first antenna radiator unit 1 is in the shape of inverted L, and a first radiator gap 11 is arranged at the bending part of the inverted L and close to the metal ground 3. A first short circular arc groove 12 is arranged on one side of the first radiator gap 11, and a first long circular arc groove 13 is arranged on the other side. The first short circular arc groove 12 is close to the radiation surface, and the first long circular arc groove 13 is close to the metal ground 3. The slot openings of the first short circular arc groove 12 and the first long circular arc groove 13 are aligned. One end of the first radio frequency coaxial transmission line 4 is exposed to a first inner conductor core wire 42 and a first ground outer conductor 44. The first ground outer conductor 44 is wrapped outside the first inner conductor core wire 42. The first short circular arc groove 12 is connected with the first inner conductor core wire 42 to serve as a feed point of the antenna. The first long circular arc groove 13 is connected with the first ground outer conductor 44 to serve as a grounding point of the antenna. The second antenna radiator unit 2 is in the shape of inverted L, and a second radiator gap 21 is arranged at the bending part of the inverted L and close to the metal ground 3. A second short circular arc groove 22 is arranged on one side of the second radiator gap 21, and a second long circular arc groove 23 is arranged on the other side. The second short circular arc groove 22 is close to the radiation surface, and the second long circular arc groove 23 is close to the metal ground 3. The slot openings of the second short circular arc groove 22 and the second long circular arc groove 23 are aligned. One end of the second radio frequency coaxial transmission line 5 is exposed to a second inner conductor core wire 52 and a second ground outer conductor 54. The second ground outer conductor 54 is wrapped outside the second inner conductor core wire 52. The second short circular arc groove 22 is connected with the second inner conductor core wire 52 to serve as a feed point of the antenna. The second long circular arc groove 53 is connected with the second ground outer conductor 54 to serve as a grounding point of the antenna.

[0069] In actual application, the sheet metal antenna of UWB and the Internet of Things device provided by the embodiment of the present application. In use, the sheet metal antenna of UWB is fixed in the device through the positioning hole and the screw hole on the metal ground 3. The radio frequency coaxial transmission line transmits the UWB signal to the short circular arc groove on the antenna radiator unit. The current signal is converted into electromagnetic wave signal by the antenna radiator unit and transmitted to the free space. The sheet metal antenna of UWB provided by the embodiment of the present application occupies small space of the Internet of Things device, is convenient to assemble and disassemble, has small antenna loss, high radiation efficiency, stable signal radio frequency and accurate positioning.

[0070] The application has been described in detail with specific reference to particular embodiments and exemplified examples, but it will be understood that these are only examples and are not intended to limit the application, as the application can be modified in various equivalent and / or functional ways and can be implemented in various examples. It will be appreciated that those skilled in the art will be able to devise numerous alternative arrangements and procedures for carrying out the application without departing from the spirit and scope of the application. The scope of the application is not to be limited by the specific examples given.

Claims

1. A sheet metal antenna for UWB, characterized by, The utility model relates to a kind of UWB antenna, including: Sheet metal integrally formed first antenna radiator unit (1), second antenna radiator unit (2) and metal ground (3), further including first radio frequency coaxial transmission line (4) and second radio frequency coaxial transmission line (5); The first antenna radiator unit (1) and second antenna radiator unit (2) are vertically arranged on the same side of the metal ground (3) towards consistent; The first antenna radiator unit (1) is inverted L shape, and first radiator slot (11) is arranged at the bending of inverted L and close to the metal ground (3), first circular arc short groove (12) is arranged on the side of first radiator slot (11), and first circular arc long groove (13) is arranged on the other side, the first circular arc short groove (12) is close to radiation surface, the first circular arc long groove (13) is close to metal ground (3), the first circular arc short groove (12) and the first circular arc long groove (13) slot are aligned, One end of the first radio frequency coaxial transmission line (4) exposes first inner conductor core wire (42) and first ground outer conductor (44), the first ground outer conductor (44) is wrapped outside the first inner conductor core wire (42), the first circular arc short groove (12) is connected with the first inner conductor core wire (42) to serve as the feed point of antenna, and the first circular arc long groove (13) is connected with the first ground outer conductor (44) to serve as the ground point of antenna; The second antenna radiator unit (2) is inverted L shape, and second radiator slot (21) is arranged at the bending of inverted L and close to the metal ground (3), second circular arc short groove (22) is arranged on the side of second radiator slot (21), and second circular arc long groove (23) is arranged on the other side, the second circular arc short groove (22) is close to radiation surface, the second circular arc long groove (23) is close to metal ground (3), the second circular arc short groove (22) and the second circular arc long groove (23) slot are aligned, One end of the second radio frequency coaxial transmission line (5) exposes second inner conductor core wire (52) and second ground outer conductor (54), the second ground outer conductor (54) is wrapped outside the second inner conductor core wire (52), the second circular arc short groove (22) is connected with the second inner conductor core wire (52) to serve as the feed point of antenna, and the second circular arc long groove (23) is connected with the second ground outer conductor (54) to serve as the ground point of antenna; First radio frequency connector (41) is further arranged on the other end of the first radio frequency coaxial transmission line (4) relative to the first inner conductor core wire (42), and the first radio frequency connector (41) is used to connect UWB chip module; Second radio frequency connector (51) is further arranged on the other end of the second radio frequency coaxial transmission line (5) relative to the second inner conductor core wire (52), and the second radio frequency connector (51) is used to connect UWB chip module. A first insulating medium layer (43) is arranged close to the first inner conductor core wire (42), abutting the inner layer of the first ground outer conductor (44), and the exposed part of the first insulating medium layer (43) is located between the first inner conductor core wire (42) and the first ground outer conductor (44) and across the first radiator slot (11); A second insulating medium layer (53) is arranged close to the second inner conductor core wire (52), abutting the inner layer of the second ground outer conductor (54), and the exposed part of the second insulating medium layer (53) is located between the second inner conductor core wire (52) and the second ground outer conductor (54) and across the second radiator slot (21); A first insulating protective layer (46) and a first metal wire clamp (47) are arranged on the first radio frequency coaxial transmission line (4), the first insulating protective layer (46) is arranged on the outer layer of the first radio frequency coaxial transmission line (4), and the first metal wire clamp (47) is used to be fixed on the metal ground of the equipment; A second insulating protective layer (56) and a second metal wire clamp (57) are arranged on the second radio frequency coaxial transmission line (5), the second insulating protective layer (56) is arranged on the outer layer of the second radio frequency coaxial transmission line (5), and the second metal wire clamp (57) is used to be fixed on the metal ground of the equipment; A first metal clamping groove (35), a second metal clamping groove (36), a third metal clamping groove (37) and a baffle (38) are arranged on the metal ground (3); The first metal clamping groove (35) is used to fix the first radio frequency coaxial transmission line (4), the second metal clamping groove (36) and the third metal clamping groove (37) are opposite in opening direction, the second metal clamping groove (36) and the third metal clamping groove (37) are used to fix the second radio frequency coaxial transmission line (5), the baffle (38) is located on the inner side of the second radio frequency coaxial transmission line (5) and on the opposite side of the first antenna radiator unit (1); A first fixed outer conductor (45) is arranged on the first radio frequency coaxial transmission line (4), and the first fixed outer conductor (45) is connected with the first metal clamping groove (35); A second fixed outer conductor (55) is arranged on the second radio frequency coaxial transmission line (5), and the second fixed outer conductor (55) is connected with the second metal clamping groove (36) and the third metal clamping groove (37) respectively; A first metal conductive cloth (48) is arranged on the first radio frequency coaxial transmission line (4), close to the first radio frequency connector (41) and at the same end, a part of the first metal conductive cloth (48) is wrapped around the outer conductor of the first radio frequency coaxial transmission line (4) and electrically connected with the outer conductor, and the other part can be used to be attached to the metal ground of the PCB mainboard to filter out signal interference on the PCB mainboard. The second radio frequency coaxial transmission line (5) is also provided with a second metal conductive cloth (58), which is close to the second radio frequency connector (51) and at the same end, a part of the second metal conductive cloth (58) is wrapped on the outer conductor of the second radio frequency coaxial transmission line (5) and is electrically connected with the outer conductor, and the other part can be used to be attached to the metal ground of the PCB mainboard to filter out the signal interference on the PCB mainboard.

2. The sheet metal antenna of claim 1, wherein, The first antenna radiator unit (1) and the second antenna radiator unit (2) are in the same plane and the distance therebetween is 0.45-0.5 times the wavelength of the radiated wave.

3. The sheet metal antenna of claim 1, wherein, One end of the metal ground (3) is also provided with a first positioning hole (31) and a first screw hole (32), and the other end is provided with a second positioning hole (33) and a second screw hole (34). The first positioning hole (31) and the second positioning hole (33) are used to connect the positioning column inside the equipment, and the first screw hole (32) and the second screw hole (34) are used to connect the metal ground screw hole on the equipment through a screw.

4. An Internet of Things device, characterized by It comprises a sheet metal antenna of UWB as claimed in any one of claims 1-3.

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