An integrated bluetooth and ultra-wideband antenna structure for communication and precise positioning

Abstract

The application discloses an integrated Bluetooth and ultra-wideband antenna structure for communication and accurate positioning, which is designed for simultaneously realizing the Bluetooth and the ultra-wideband antenna in a narrow space, fully utilizes the wavelength characteristics corresponding to the Bluetooth frequency band and the ultra-wideband frequency band, takes the ultra-wideband antenna radiator with shorter wavelength as the excitation source of the Bluetooth antenna radiator in the form of near-field coupling, and excites the Bluetooth radiator. In the working mode, the ultra-wideband radiator and the antenna reference ground form a non-dipole working mode, and the Bluetooth radiator is coupled and excited to be in a dipole working mode, so that the mutual interference between the two radiators is minimized, and the mutual interference between the two antenna frequency bands is reduced to the maximum extent.

Description

Technical Field

[0001] This invention belongs to the field of communication and positioning technology, and proposes an integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning. Background Technology

[0002] In recent years, Ultra Wide Band (UWB) technology has received increasing attention and become a hot topic in communication technology. As a technology specifically designed to provide micro-positioning and secure communication, it utilizes nanosecond-level non-sinusoidal narrow pulses to transmit data and is considered a revolutionary advancement in radio technology. Its enormous potential makes it suitable for a wide range of applications in wireless communication, radar tracking, and precise positioning.

[0003] UWB's precise positioning technology can support the development of over 40 vertical industries, including mobile consumer electronics, smart homes, smart logistics, and smart robots, enabling numerous convenient functions. Precise positioning is the most prominent feature of UWB technology, achieving an accuracy of 0.1 meters, and it has already been applied in many products.

[0004] UWB positioning technology achieves precise location by measuring the distance and angle between the tag and the anchor point. There are many types of positioning tags, including wristbands, mobile phones, badges, and earphones. These devices typically include a Bluetooth antenna in addition to a UWB antenna. However, the compact internal space of these devices can cause interference between the two antennas, preventing them from achieving optimal performance.

[0005] To solve the above problems, the current common practice is:

[0006] 1. Place the two antennas at opposite ends or diagonally across the device to maximize spatial distance and improve isolation.

[0007] 2. Reduce mutual interference between antennas by using different antenna types.

[0008] Option 1: Due to the limited space required for compact device layout, especially for devices like wristbands, there isn't enough space to accommodate a distributed design. Option 2: Due to the irregular structure of the product, even with different antenna types, mutual interference between antennas cannot be completely avoided. The motherboard ground current will simultaneously act on two antennas, leading to crosstalk between them. Summary of the Invention

[0009] The purpose of this invention is to address the aforementioned problems by providing an integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning. Designed to simultaneously realize Bluetooth and ultra-wideband antennas within confined spaces, it fully utilizes the wavelength characteristics of the Bluetooth band (2400-2500MHz) and the ultra-wideband band (6100-8400MHz). The shorter-wavelength ultra-wideband antenna radiator serves as both the radiation source and the excitation source for the Bluetooth antenna radiator, exciting the Bluetooth radiator through near-field coupling. In terms of operating mode, the ultra-wideband radiator and the antenna reference ground form a non-dipole operating mode, while the Bluetooth radiator, being coupled and excited, operates in a dipole mode. This operating mode minimizes mutual interference between the two radiators, reducing interference between the two antenna bands to the greatest extent possible.

[0010] To achieve the above objectives, the present invention adopts the following technical solutions:

[0011] An integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning includes a Bluetooth antenna radiator, an ultra-wideband antenna radiator, a duplexer and matching circuit, an excitation source, and an antenna reference ground.

[0012] The duplexer and matching circuit described herein are compatible with both the Bluetooth antenna radiator and the ultra-wideband antenna radiator.

[0013] The excitation source is positioned between the ultra-wideband antenna radiator and the antenna reference ground to enable the ultra-wideband antenna radiator to operate in non-dipole mode.

[0014] The ultra-wideband antenna radiator is connected to the duplexer and matching circuit via the excitation source.

[0015] The duplexer and matching circuit are connected to the ultra-wideband chip RF circuit and the Bluetooth chip RF circuit.

[0016] The Bluetooth antenna radiator is coupled to the ultra-wideband antenna radiator through an insulating dielectric layer. The excited ultra-wideband antenna radiator serves as the excitation source for the Bluetooth antenna radiator, and the Bluetooth antenna radiator is not electrically connected to the antenna reference ground so that the Bluetooth antenna radiator is in dipole mode.

[0017] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the ultra-wideband antenna radiator and the Bluetooth antenna radiator are located on the same side of the insulating medium.

[0018] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the ultra-wideband antenna radiator and the Bluetooth antenna radiator are located on opposite sides of an insulating medium, and their orthogonal projections intersect.

[0019] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the ultra-wideband antenna radiator is located within the orthographic projection area of ​​the Bluetooth antenna radiator.

[0020] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the antenna reference ground is provided by the motherboard of the electronic device.

[0021] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the duplexer and matching circuit, the ultra-wideband chip RF circuit, and the Bluetooth chip RF circuit are all located on the motherboard of the electronic device.

[0022] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the duplexer and matching circuit include a duplexer and a matching circuit that is adapted to both the Bluetooth antenna radiator and the ultra-wideband antenna radiator. The duplexer supports both the Bluetooth band and the ultra-wideband band. Both signals from the Bluetooth antenna radiator and the ultra-wideband antenna radiator pass through the matching circuit and then enter the duplexer, which transmits the two signals to the Bluetooth chip RF circuit and the ultra-wideband chip RF circuit, respectively.

[0023] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the duplexer and matching circuit include a duplexer, a first matching circuit, and a second matching circuit. The first matching circuit is adapted to the Bluetooth antenna radiator, and the second matching circuit is adapted to the ultra-wideband antenna radiator. Signals from the Bluetooth antenna radiator are transmitted sequentially through the duplexer and the first matching circuit to the Bluetooth chip RF circuit, and signals from the ultra-wideband antenna radiator are transmitted to the ultra-wideband chip RF circuit through the duplexer and the second matching circuit.

[0024] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the insulating dielectric layer is a PCB board or an FPC board.

[0025] In the aforementioned integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, the thickness of the insulating dielectric layer is 0.08mm-0.2mm.

[0026] The area of ​​the ultra-wideband antenna radiator is 3mm-8mm; × 3mm-8mm;

[0027] The area of ​​the Bluetooth antenna radiator is 15mm-25mm; × 3mm-8mm;.

[0028] The advantages of this invention are:

[0029] 1. The ultra-wideband antenna radiator and the Bluetooth antenna radiator are isolated by a dielectric layer and are very close to each other. Only the ultra-wideband antenna radiator is electrically connected to the antenna reference ground, while the Bluetooth antenna radiator itself is not electrically connected to the antenna reference ground. The excited ultra-wideband antenna radiator is used as the excitation source to excite the Bluetooth antenna radiator, so that the two radiators can operate in non-dipole and dipole modes respectively. With the help of a matching network and duplexer, the Bluetooth and ultra-wideband antennas are integrated into one design, which effectively solves the problems of antenna interference and efficiency in the same clearance environment.

[0030] 2. Fully utilizing the wavelength characteristics of the Bluetooth frequency band (2400-2500MHz) and the ultra-wideband frequency band (6100-8400MHz), the shorter-wavelength ultra-wideband antenna radiator is used as both the radiation source and the excitation source for the Bluetooth antenna radiator, exciting the Bluetooth radiator through near-field coupling. In terms of operating mode, the ultra-wideband radiator and the antenna reference ground form a non-dipole operating mode, while the Bluetooth radiator, being coupled and excited, operates in a dipole mode. This operating mode minimizes mutual coupling between the two radiators.

[0031] 3. Due to the antenna structure design of this solution, it is possible to realize both ultra-wideband antenna and Bluetooth antenna in a small space with almost no interference between them, and can achieve the best performance even in scenarios with compact internal space layout.

[0032] 4. The Bluetooth antenna radiator in this design is not electrically connected to the motherboard and operates in dipole mode. When used in smart wearable devices, the proportion of radiation absorbed by the human body is significantly lower, which is more beneficial for Bluetooth antenna communication and the wearer's health. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the integrated Bluetooth and ultra-wideband antenna for communication and precise positioning according to the present invention.

[0034] Figure 2 This invention relates to a configuration of a duplexer and matching circuit in an integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning.

[0035] Figure 3 This is another configuration of the duplexer and matching circuit in the integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning of the present invention.

[0036] Figure 4 This is a schematic diagram illustrating the use of the integrated Bluetooth and ultra-wideband antenna structure of the present invention for communication and precise positioning in a positioning wristband.

[0037] Figure 5A schematic diagram illustrating the use of the integrated Bluetooth and ultra-wideband antenna structure of this invention for communication and precise positioning in a positioning wristband, with the dielectric layer being a flexible printed circuit board;

[0038] Figure 6 and Figure 7 The figures show the antenna performance test results in free space and when worn, respectively, when the integrated Bluetooth and ultra-wideband antenna structure of this invention for communication and precise positioning is used in a positioning bracelet.

[0039] Figure 8 The return loss test results of this embodiment of the integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning according to the present invention are shown in the figure.

[0040] Figure 9 The figure shows the antenna radiation efficiency test results of this embodiment of the integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, which is based on the present invention.

[0041] Reference numerals: 1. Bluetooth antenna radiator; 2. Ultra-wideband antenna radiator; 3. Duplexer and matching circuit; 31. Duplexer; 32. Matching circuit; 33. First matching circuit; 34. Second matching circuit; 4. Excitation source; 5. Antenna reference ground; 6. Ultra-wideband chip RF circuit; 7. Bluetooth chip RF circuit; 8. Insulating dielectric layer; 9. Watchband; 10. Main body; 11. Antenna area. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0043] like Figure 1 As shown, this solution provides an integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, including a Bluetooth antenna radiator 1, an ultra-wideband antenna radiator 2, a duplexer and matching circuit 3, an excitation source 4, and an antenna reference ground 5.

[0044] The duplexer and matching circuit 3 are connected to the ultra-wideband chip RF circuit 6 and the Bluetooth chip RF circuit 7, that is, connecting the ultra-wideband chip RF transceiver and the Bluetooth chip RF transceiver, and are adapted to the Bluetooth antenna radiator 1 and the ultra-wideband antenna radiator 2. The adaptation standard is that the duplexer 31 supports Bluetooth and ultra-wideband frequency bands, and the matching circuit 32 provides sufficient energy loss reduction for the corresponding RF signals.

[0045] Specifically, such as Figure 2As shown, the duplexer and matching circuit 3 includes a duplexer 31 and a matching circuit 32 that is adapted to both the Bluetooth antenna radiator 1 and the ultra-wideband antenna radiator 2. The duplexer 31 supports both the Bluetooth band and the ultra-wideband band. Both signals from the Bluetooth antenna radiator 1 and the ultra-wideband antenna radiator 2 enter the duplexer 31 through the matching circuit 32. The duplexer 31 then transmits the two signals to the Bluetooth chip RF circuit 7 and the ultra-wideband chip RF circuit 6, respectively.

[0046] Or, such as Figure 3 As shown, the duplexer and matching circuit 3 includes a duplexer 31, a first matching circuit 33, and a second matching circuit 34. The first matching circuit 33 is adapted to the Bluetooth antenna radiator 1, and the second matching circuit 34 is adapted to the ultra-wideband antenna radiator 2. The signal from the Bluetooth antenna radiator 1 is transmitted to the Bluetooth chip RF circuit 7 through the duplexer 31 and the first matching circuit 33 in sequence. The signal from the ultra-wideband antenna radiator 2 is transmitted to the ultra-wideband chip RF circuit 6 through the duplexer 31 and the second matching circuit 34.

[0047] Excitation source 4 is placed between the ultra-wideband antenna radiator 2 and the antenna reference ground 5 so that the ultra-wideband antenna radiator 2 operates in a non-dipole mode, such as Monopole, IFA, PIFA, Loop, etc.

[0048] Excitation source 4 is located at the output port of duplexer 31, and ultra-wideband antenna radiator 2 is connected to duplexer and matching circuit 3 through excitation source 4.

[0049] Bluetooth antenna radiator 1 is coupled to ultra-wideband antenna radiator 2 through insulating dielectric layer 8. The excited ultra-wideband antenna radiator 2 serves as the excitation source for Bluetooth antenna radiator 1, and Bluetooth antenna radiator 1 is not electrically connected to antenna reference ground 5 so that Bluetooth antenna radiator 1 is in dipole mode.

[0050] By exciting the radiator of the Bluetooth antenna using the radiator of the ultra-wideband antenna, the ultra-wideband antenna operates in non-dipole mode, while the Bluetooth antenna operates in dipole mode, which can minimize the mutual interference between the two antenna frequency bands.

[0051] Antenna reference ground 5 can be the motherboard of an electronic device or other conductive structures.

[0052] The insulating dielectric layer 8 can be a PCB board (rigid board), FPC board (flexible board), or other forms of insulating material.

[0053] The Bluetooth antenna radiator 1 and the ultra-wideband antenna radiator 2 are made of conductive materials and are located on the same side or both sides of the insulating medium. In this embodiment, the latter is preferred, and it is also preferred that the orthographic projections of the two intersect, so that the ultra-wideband antenna radiator 2 can be located within the orthographic projection area of ​​the Bluetooth antenna radiator 1 to improve the coupling strength.

[0054] The duplexer and matching circuit 3, the ultra-wideband chip RF circuit 6, and the Bluetooth chip RF circuit 7 are all located on the motherboard of the electronic device and do not occupy additional antenna area space.

[0055] The thickness of the insulating dielectric layer 8 is preferably 0.08mm-0.2mm; the area of ​​the ultra-wideband antenna radiator 2 is preferably 3mm-8mm×3mm-8mm; and the area of ​​the Bluetooth antenna radiator 1 is preferably 15mm-25mm×3mm-8mm.

[0056] Figure 4 This is a schematic diagram illustrating the application of the integrated Bluetooth and ultra-wideband antenna structure of this invention for communication and precise positioning in a positioning wristband. The smart wristband consists of a strap 9 and a main body 10. Due to the compact layout of its internal motherboard, screen, battery, and other components, the antenna area 11 reserved for the antenna is 20mm long and 5mm wide. According to the antenna's operating wavelength, placing both Bluetooth and ultra-wideband antennas in this area simultaneously would cause antenna interference. This embodiment adopts the integrated Bluetooth and ultra-wideband antenna design concept proposed in this invention, such as... Figure 5 As shown, the antenna uses a flexible printed circuit board (FPCB) with a thickness of 0.1 mm. The ultra-wideband antenna radiator 2, located on the bottom layer of the FPCB, has an area of ​​6 mm * 4.5 mm. Through the ultra-wideband antenna radiator 2, a wideband resonance operating at 6100-8400 MHz can be generated, supporting the ultra-wideband CH5 and CH9 frequency bands. The Bluetooth antenna radiator 1, located on the top layer of the FPCB, has an area of ​​19 mm * 4.5 mm. The ultra-wideband antenna radiator 2, serving as the excitation source for the Bluetooth antenna radiator 1, is located at the bottom of the Bluetooth antenna radiator 1, and the two radiators intersect in their projected areas to enhance coupling strength. This coupling excitation method also effectively reduces the physical area of ​​the Bluetooth antenna radiator 1, achieving antenna miniaturization. With the above antenna layout and matching circuitry, [the following can be achieved / implemented]... Figure 6 The antenna design simultaneously covers both Bluetooth and ultra-wideband frequencies. Figure 6 and Figure 7 The antenna performance of this invention is presented in free space and under wearing conditions, showing that the resonant frequency remains unchanged in both states. Regarding antenna efficiency, the overall efficiency exceeds 70% in free space, and the low-frequency efficiency is close to 20% under wearing conditions, exceeding the industry standard for Bluetooth antennas in wearable devices. This is because the antenna operates in dipole mode under Bluetooth mode, and the device motherboard does not contribute significantly to Bluetooth radiation, thus avoiding the efficiency drop caused by the motherboard and minimizing the impact of hand-related factors on its efficiency compared to conventional antenna designs.

[0057] in addition, Figure 8 and Figure 9This is the actual measurement result of this embodiment. In the actual measurement, the antenna adopts a flexible printed circuit board design with a thickness of 0.113mm. The ultra-wideband antenna radiator 2 is located on the bottom layer of the flexible printed circuit board, with an area of ​​5mm*5mm. The Bluetooth antenna radiator 1 is located on the top layer of the flexible printed circuit board, with an area of ​​18mm*5mm. There is no electrical connection between the ultra-wideband antenna radiator 2 and the Bluetooth antenna radiator 1. By coupling and exciting the Bluetooth radiator through the ultra-wideband antenna radiator 2, the following can be obtained: Figure 8 The return loss diagram covers the operating frequency bands of 2400MHz-2500MHz and 6100MHz-8400MHz. Material losses in actual testing are taken into account, such as... Figure 9 The antenna radiation efficiencies shown are all above 50%, meeting the efficiency requirements. It can be seen that the solution of this invention can fully utilize the radiation performance of both the Bluetooth antenna and the ultra-wideband antenna in a smart bracelet, achieving a combined Bluetooth and ultra-wideband antenna design.

[0058] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning, characterized in that: It includes a Bluetooth antenna radiator (1), an ultra-wideband antenna radiator (2), a duplexer and matching circuit (3), an excitation source (4), and an antenna reference ground (5). The duplexer and matching circuit (3) are adapted to both the Bluetooth antenna radiator (1) and the ultra-wideband antenna radiator (2). The excitation source (4) is positioned between the ultra-wideband antenna radiator (2) and the antenna reference ground (5) to enable the ultra-wideband antenna radiator (2) to operate in non-dipole mode; The ultra-wideband antenna radiator (2) is connected to the duplexer and matching circuit (3) through the excitation source (4); The duplexer and matching circuit (3) are connected to the ultra-wideband chip RF circuit (6) and the Bluetooth chip RF circuit (7). The Bluetooth antenna radiator (1) is coupled to the ultra-wideband antenna radiator (2) through an insulating dielectric layer (8). The excited ultra-wideband antenna radiator (2) serves as the excitation source of the Bluetooth antenna radiator (1), and the Bluetooth antenna radiator (1) is not electrically connected to the antenna reference ground (5) so that the Bluetooth antenna radiator (1) is in dipole mode. The ultra-wideband antenna radiator (2) and the Bluetooth antenna radiator (1) are located on opposite sides of the insulating dielectric layer (8), and their orthographic projections intersect. The ultra-wideband antenna radiator (2) is located within the orthographic projection area of ​​the Bluetooth antenna radiator (1).

2. The integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning according to claim 1, characterized in that: The antenna reference ground (5) is provided by the motherboard of the electronic device.

3. The integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning according to claim 2, characterized in that: The duplexer and matching circuit (3), the ultra-wideband chip RF circuit (6), and the Bluetooth chip RF circuit (7) are all located on the motherboard of the electronic device.

4. The integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning according to claim 1, characterized in that: The duplexer and matching circuit (3) includes a duplexer (31) and a matching circuit (32) that is adapted to both the Bluetooth antenna radiator (1) and the ultra-wideband antenna radiator (2). The duplexer (31) supports both the Bluetooth band and the ultra-wideband band. Both signals from the Bluetooth antenna radiator (1) and the ultra-wideband antenna radiator (2) pass through the matching circuit (32) and then enter the duplexer (31). The duplexer (31) transmits the two signals to the Bluetooth chip RF circuit (7) and the ultra-wideband chip RF circuit (6) respectively.

5. The integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning according to claim 1, characterized in that: The duplexer and matching circuit (3) includes a duplexer (31), a first matching circuit (33), and a second matching circuit (34). The first matching circuit (33) is adapted to the Bluetooth antenna radiator (1), and the second matching circuit (34) is adapted to the ultra-wideband antenna radiator (2). The signal from the Bluetooth antenna radiator (1) is transmitted to the Bluetooth chip radio frequency circuit (7) through the duplexer (31) and the first matching circuit (33) in sequence. The signal from the ultra-wideband antenna radiator (2) is transmitted to the ultra-wideband chip radio frequency circuit (6) through the duplexer (31) and the second matching circuit (34).

6. The integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning according to claim 1, characterized in that: The insulating dielectric layer (8) is a PCB board or an FPC board.

7. The integrated Bluetooth and ultra-wideband antenna structure for communication and precise positioning according to claim 6, characterized in that: The thickness of the insulating dielectric layer (8) is 0.08mm-0.2mm; The area of ​​the ultra-wideband antenna radiator (2) is (3mm-8mm)×(3mm-8mm). The area of ​​the Bluetooth antenna radiator (1) is (15mm-25mm)×(3mm-8mm).

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