Ring antenna and smart ring applied to the smart ring

Abstract

The application discloses a ring antenna applied to a smart ring and the smart ring. The ring antenna applied to the smart ring comprises concentric outer and inner metal rings, the diameter of the outer metal ring is larger than that of the inner metal ring, the outer metal ring and the inner metal ring are short-circuited through at least one pair of metal connecting lines, each pair of metal connecting lines comprises two metal connecting lines respectively located at the vertical two ends of the outer metal ring and the inner metal ring, a ring-shaped PCB is arranged between the outer metal ring and the inner metal ring, a feeding point arranged on the ring-shaped PCB is connected with the outer metal ring, the inner metal ring and the outer metal ring are supported through a ring-shaped nonmetal filler, and a first gap vertically penetrating the wall of the ring is formed in the outer metal ring. The ring antenna applied to the smart ring and the smart ring provided by the embodiment of the application provide a small-sized and stable-performance smart ring antenna.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to antenna technology, in particular to a ring antenna applied to a smart ring and the smart ring. BACKGROUND

[0002] With the increasing concern of people on health, wearable devices capable of monitoring physiological parameters of human body in real time have entered people's daily life. Wearable devices have various forms, such as smart watches, smart glasses, smart rings and the like. Various wearable devices can monitor physiological parameters such as body temperature, pulse, heart rate, blood pressure and the like of human body through contact with human body, and transmit the monitored data to a terminal such as a mobile phone through wireless communication technology. Among the numerous wearable devices, smart rings have great application potential in health monitoring due to the advantages of small structure and convenient carrying.

[0003] As an indispensable part of communication between the smart ring and the external terminal, the performance of the antenna will directly affect whether the smart ring can work normally and whether the monitored data can be correctly transmitted to the external terminal. However, due to the small structure of the smart ring, the space that can be occupied by the antenna is extremely limited, and the traditional antenna form comparable to the wavelength is difficult to perform. In addition, the smart ring is usually worn on the finger of human body, and the hand of human body will change with different grips, that is, the environment of the antenna of the smart ring is not only related to the surrounding environment but also dynamically variable. These problems cause the working frequency and impedance matching performance of the smart ring antenna to change, thereby affecting the communication performance and reliability of the smart ring. SUMMARY

[0004] The present application provides a ring antenna applied to a smart ring and the smart ring, and provides a small and stable performance smart ring antenna.

[0005] In a first aspect, the embodiment of the present application provides a ring antenna applied to a smart ring, comprising: an inner metal ring, a ring-shaped PCB, an outer metal ring, and a ring-shaped non-metal filling.

[0006] The outer metal ring is concentric with the inner metal ring, and the diameter of the outer metal ring is greater than the diameter of the inner metal ring. The outer metal ring and the inner metal ring are short-circuited by at least one pair of metal connecting lines. Each pair of metal connecting lines includes two metal connecting lines respectively located at the vertical two ends of the outer metal ring and the inner metal ring. The ring-shaped PCB is arranged between the outer metal ring and the inner metal ring. A feeding point arranged on the ring-shaped PCB is connected with the outer metal ring.

[0007] The inner metal ring and the outer metal ring are supported by the ring-shaped non-metal filling.

[0008] The outer metal ring is provided with a first slit vertically penetrating the wall of the ring.

[0009] In a possible implementation manner of the first aspect, a series matching capacitor is arranged between the feeding point and the outer metal ring.

[0010] In a possible implementation manner of the first aspect, an antenna matching network is further arranged on the annular PCB, and the antenna matching network is connected between the feeding point and a radio frequency transceiver port.

[0011] In a possible implementation manner of the first aspect, the outer metal ring and the inner metal ring are short-circuited by two pairs of metal connecting lines, and the two pairs of metal connecting lines are arranged oppositely on the vertical two ends of the outer metal ring and the inner metal ring.

[0012] In a possible implementation manner of the first aspect, the outer metal ring and the inner metal ring are short-circuited by one pair of metal connecting lines.

[0013] In a possible implementation manner of the first aspect, each pair of metal connecting lines is located on a straight line in the vertical direction of the outer metal ring.

[0014] In a possible implementation manner of the first aspect, the annular non-metal is filled with an annular ceramic block.

[0015] In a possible implementation manner of the first aspect, the annular ceramic block is two, and is arranged on the vertical two ends of the inner metal ring and the outer metal ring respectively, and the shape of the annular ceramic block is the same as the shape of the gap between the inner metal ring and the outer metal ring.

[0016] In a possible implementation manner of the first aspect, the feeding point arranged on the annular PCB is connected with the outer metal ring by a metal sheet or a metal probe.

[0017] In the second aspect, the embodiments of the present application provide a smart ring, which comprises the annular antenna applied to the smart ring and the smart ring circuit as shown in any possible implementation manner of the first aspect, and the smart ring circuit is arranged on the annular PCB in the annular antenna applied to the smart ring.

[0018] The annular antenna applied to the smart ring and the smart ring provided by the embodiments of the present application realize the miniaturization of the antenna radiator due to the conformal design with the smart ring, and have high stability, and can meet the demand of the smart ring on the antenna. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1This is a schematic diagram of a loop antenna applied to a smart ring, provided as an embodiment of the present invention.

[0020] Figure 2 for Figure 1 The illustrated embodiment provides a schematic diagram of the frequency bandwidth response of a loop antenna applied to a smart ring.

[0021] Figure 3 for Figure 1 A schematic diagram of the radiation performance of a loop antenna applied to a smart ring, provided in the illustrated embodiment;

[0022] Figure 4 This is a schematic diagram of another loop antenna applied to a smart ring, provided by an embodiment of the present invention.

[0023] Figure 5 for Figure 4 The illustrated embodiment provides a schematic diagram of the frequency bandwidth response of a loop antenna applied to a smart ring.

[0024] Figure 6 for Figure 4 The illustrated embodiment provides a schematic diagram of the radiation performance of a loop antenna applied to a smart ring. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0026] Traditional smart ring antennas primarily consist of slot antennas and loop antennas. Traditional slot ring antennas involve creating half-wavelength or quarter-wavelength slots in the metal wall of the ring, then exciting the slot radiation source through offset feeding to achieve resonance and energy radiation. However, this type of antenna occupies a large space, making it difficult to meet the high-density integration requirements of smart ring applications. Traditional loop ring antennas utilize the entire ring-shaped metal wall of the ring as the radiator, with excitation at the upper opening to achieve loop antenna radiation. However, the resonant frequency of this type of antenna is limited by the ring area, and it also suffers from problems such as susceptibility to interference from human tissue. Therefore, both traditional slotted and loop-structured ring antennas are insufficient to meet the wireless communication requirements of smart rings.

[0027] To address the aforementioned issues, this invention provides a miniaturized and highly stable smart ring antenna to meet the antenna performance requirements of smart rings.

[0028] Figure 1A structure diagram of a ring antenna applied to a smart ring is provided for an embodiment of the present application, as shown in the figure. Figure 1 The ring antenna applied to the smart ring provided by the embodiment includes an inner metal ring 11, a ring-shaped printed circuit board (PCB) 12, an outer metal ring 13, and a ring-shaped non-metal filler 14.

[0029] The outer metal ring 13 is concentric with the inner metal ring 11, and the diameter of the outer metal ring 13 is greater than that of the inner metal ring 11. Both the outer metal ring 13 and the inner metal ring 11 are metal rings with a certain ring wall width. The cross section of the outer metal ring 13 and the inner metal ring 11 can be circular or elliptical, and the width of the ring wall of the outer metal ring 13 and the inner metal ring 11 can be the same or different, which can be determined according to the design shape of the smart ring. The detailed shape of the outer metal ring 13 and the inner metal ring 11 needs to maintain the basic metal ring structure. The diameter of the inner metal ring 11 is slightly larger than that of the human finger, and the inner metal ring 11 is the part of the smart ring in contact with the human finger. The diameter of the outer metal ring 13 is greater than that of the inner metal ring 11, and other devices for the smart ring are arranged between the outer metal ring 13 and the inner metal ring 11.

[0030] The outer metal ring 13 and the inner metal ring 11 are short-circuited by at least one pair of metal connecting lines 15. Each pair of metal connecting lines 15 includes two metal connecting lines 15 located at the vertical two ends of the outer metal ring 13 and the inner metal ring 11, Figure 1 Two pairs of metal connecting lines 15 are shown in the figure, and the two pairs of metal connecting lines 15 are oppositely arranged at the vertical two ends of the outer metal ring 13 and the inner metal ring 11. Through the connection of the metal connecting lines 15, a current loop can be formed between the outer metal ring 13 and the inner metal ring 11. Then the effective electrical length of the entire ring antenna is the sum of the circumference of the outer metal ring 13 and the circumference of the inner metal ring 11 plus the length of the metal connecting lines 15. At least one pair of metal connecting lines 15 between the outer metal ring 13 and the inner metal ring 11 forms inductive loading of the ring antenna, realizing the radiation of electromagnetic energy of the ring antenna.

[0031] Further, each pair of metal connecting lines 15 is located on a straight line in the vertical direction of the outer metal ring 13, that is, each pair of metal connecting lines 15 is oppositely arranged.

[0032] The annular PCB 12 is arranged between the outer metal ring 13 and the inner metal ring 11, and a feed point 16 arranged on the annular PCB 12 is connected with the outer metal ring 13. Various devices in the smart ring can be arranged on the annular PCB 12, such as a processor, a radio frequency processing module, various sensors, and external devices of the smart ring. The annular PCB 12 is in a circular ring shape, and the outer diameter of the annular PCB 12 can be the same as the inner diameter of the outer metal ring 13, and the inner diameter of the annular PCB 12 can be the same as the outer diameter of the inner metal ring 11. That is, the annular PCB 12 is tightly filled between the outer metal ring 13 and the inner metal ring 11, which can serve as a support between the outer metal ring 13 and the inner metal ring 11 on the one hand, and a larger area of the PCB 12 is also conducive to providing deployment space for various devices on the other hand. The feed point 16 on the annular PCB 12 is connected with the outer metal ring 13 through a metal sheet or a metal probe 17 to realize the access of a radio frequency signal and the excitation of the annular antenna. By adjusting the connection position of the feed point 16 and the outer metal ring 13, the impedance matching and passband performance of the entire annular antenna can be adjusted.

[0033] The inner metal ring 11 and the outer metal ring 13 are supported through the annular non-metal filling 14. As a wearable device, the smart ring needs to be worn by the human body and used in the daily life of the human body, so the smart ring needs to have a certain beauty on the one hand and a certain strength on the other hand. Therefore, the annular non-metal filling 14 is arranged between the inner metal ring 11 and the outer metal ring 13 to provide support strength for the smart ring and provide a decorative appearance for the smart ring. The annular non-metal filling 14 is generally selected to be a hard material, such as a ceramic material or other non-metallic materials. The shape of the annular non-metal filling 14 can be the same as that of the annular PCB 12, and is arranged on both sides of the annular PCB 12 to shield the annular PCB 12 and provide protection for the devices on the annular PCB 12.

[0034] When the annular non-metal filler 14 is an annular ceramic block, two annular ceramic blocks can be arranged at the two ends of the inner metal ring 11 and the outer metal ring 13 in the vertical direction, and the shape of the annular ceramic block is the same as the shape of the gap between the inner metal ring 11 and the outer metal ring 13. That is, the gap between the inner metal ring 11 and the outer metal ring 13 is filled with an annular ceramic block, which not only makes the smart ring look beautiful, but also provides sufficient protection for the devices inside the smart ring. The annular ceramic block, the inner metal ring 11 and the outer metal ring 13 can be connected by bonding. When the shape of the annular ceramic block matches the shape of the inner metal ring 11 and the outer metal ring 13, and the bonding material used for bonding has high waterproof performance, the entire smart ring can also have good waterproof performance.

[0035] The outer metal ring 13 is provided with a first gap 18 vertically penetrating the wall of the ring. The first gap 18 is vertically arranged on the wall of the outer metal ring 13, that is, it extends from one end to the other end of the outer metal ring 13 in the vertical direction, and completely penetrates the wall of the outer metal ring 13. That is, after the first gap 18 is opened, the outer metal ring 13 is in the shape of "C". The first gap 18 is a narrow gap, and the width of the first gap 18 is much smaller than the wavelength of the annular antenna. The first gap 18 forms a capacitive load of the annular antenna, and realizes the radiation leakage of the electromagnetic energy of the annular antenna.

[0036] The outer metal ring 13 and the inner metal ring 11 connected by at least one pair of metal connecting lines 15 serve as a conformal antenna of the smart ring. The outer metal ring 13 is the outer wall of the smart ring, and the inner metal ring 11 is the inner wall of the smart ring. The first gap 18 serves as the radiation outlet of the electromagnetic energy of the entire annular antenna, so that the electromagnetic energy radiation of the entire annular antenna is stable and not easily affected by human tissues. The annular antenna applied to the smart ring provided by the embodiment realizes the miniaturization of the antenna radiator due to the conformal design with the smart ring, has high stability, and can meet the demand of the smart ring for the antenna.

[0037] Further, a matching capacitor 19 is further included between the feed point 16 and the outer metal ring 13 in series. The matching capacitor 19 is connected in series in the feed circuit of the annular antenna, so that the antenna port has good impedance matching, and the radiation performance of the antenna is improved.

[0038] Further, an antenna matching network can be further arranged on the annular PCB 12 and connected between the feed point 16 and the radio frequency transceiving port. The antenna matching network can be a PI type matching network. By adjusting the antenna matching network, the impedance matching and the passband performance of the antenna can be adjusted.

[0039] Figure 2 for Figure 1 The illustrated embodiment provides a schematic diagram of the frequency bandwidth response of a loop antenna applied to a smart ring. Figure 3 for Figure 1 The illustrated embodiment provides a schematic diagram of the radiation performance of a loop antenna applied to a smart ring. Figure 2 The horizontal axis represents frequency, and the vertical axis represents the antenna port reflection coefficient. Figure 2 In the two curves, the solid line represents the antenna's frequency bandwidth response in a wearable environment, and the dashed line represents the antenna's frequency bandwidth response in an air environment. Figure 2 It can be seen from this that Figure 1 The antenna provided in the illustrated embodiment has an impedance bandwidth of -10dB covering the 2.4GHz-2.48GHz Bluetooth band, meeting the wireless communication requirements of wearable devices such as Bluetooth / Wi-Fi. Furthermore, comparing the antenna's impedance performance in both air and wearable environments, the antenna exhibits stable reflection coefficients and high frequency band stability; therefore, it is adopted... Figure 1 The smart ring with the antenna shown is designed for different wearable scenarios. From Figure 3 As can be seen, the antenna radiation pattern is quasi-omnidirectional, enabling wide-area radiation coverage.

[0040] Figure 4 This is a schematic diagram of another loop antenna applied to a smart ring, provided by an embodiment of the present invention. Figure 4 As shown, the loop antenna for smart rings provided in this embodiment and Figure 1 The difference in the loop antenna shown for use in a smart ring is that the outer metal ring 13 and the inner metal ring 11 are shorted by a pair of metal connecting wires 15.

[0041] The outer metal ring 13 and the inner metal ring 11 are shorted by only a pair of metal connecting lines 15, which can also achieve the conformal design of the outer metal ring 13 and the inner metal ring 11, and the structure is simpler and easier to process.

[0042] Figure 4 The antenna provided in the illustrated embodiment and Figure 1 Compared to the antenna provided in the illustrated embodiment, this antenna can meet the needs of wearable devices for a more compact size and system integration, while also further simplifying the structure of the antenna radiator. In this embodiment, the use of electrically small resonator loading technology, conformal structure design, and equivalent synthesis inverse method not only reduces the size of the radiator but also greatly simplifies structural assembly.

[0043] Figure 5 for Figure 4 The illustrated embodiment provides a schematic diagram of the frequency bandwidth response of a loop antenna applied to a smart ring. Figure 6 forFigure 4 The application provides a radiation performance diagram of a ring antenna applied to a smart ring. Figure 5 The horizontal coordinate in the diagram is frequency, and the vertical coordinate is an antenna port reflection coefficient, Figure 5 In the two curves, the solid line is a frequency bandwidth response of the antenna in a wearable environment, and the dotted line is a frequency bandwidth response of the antenna in an air environment, from Figure 5 It can be seen from the diagram that, Figure 4 The -10db impedance bandwidth of the antenna provided by the embodiment covers a 2.4GHz-2.48GHz Bluetooth frequency band, and meets the wireless communication requirements of wearable devices such as Bluetooth / WIFI. Meanwhile, compared with the frequency band performance of the antenna in the air environment and the wearable environment, the impedance bandwidth of the antenna is less affected by the change of the environment around the antenna, and the performance of the antenna is stable, so the antenna is suitable for dynamic and complex scene applications. From Figure 6 It can be seen from the diagram that the antenna radiation pattern is quasi-omnidirectional, and can realize large-angle communication coverage.

[0044] In summary, the ring antenna applied to the smart ring provided by the embodiment has the advantages of miniaturization and small space occupation, is suitable for the communication requirements of miniaturized wearable devices, has various structural forms, is flexible in design, can be extended to different devices and different application scenarios, adopts a metal frame design, has stable performance, is less affected by the human tissue environment, has the advantages of high stability, and can be applied to wearable complex and variable application scenarios, uses the inherent metal ring structure of the ring as a radiator, only needs to reserve a lumped matching circuit at the radio frequency end, has low cost, and is suitable for large-scale application and production.

[0045] In addition, based on the design idea of the ring antenna applied to the smart ring provided by the embodiment, the antenna can be extended to Internet of Things devices and other implantable / wearable devices.

[0046] The embodiment of the application further provides a smart ring, which comprises a ring antenna applied to a smart ring and a smart ring circuit. Figure 1 Or Figure 4 The smart ring circuit is arranged on a ring printed circuit board (PCB) in the ring antenna applied to the smart ring. The smart ring circuit comprises various devices or combinations used for realizing the functions of the smart ring.

[0047] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications and substitutions can be made without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A ring antenna applied to a smart ring, characterized in that, The application relates to a ring antenna applied to a smart ring. The outer metal ring is concentric with the inner metal ring, and the diameter of the outer metal ring is larger than that of the inner metal ring; the outer metal ring and the inner metal ring are short-circuited through at least one pair of metal connecting lines, each pair of metal connecting lines comprises two metal connecting lines which are respectively arranged at the vertical two ends of the outer metal ring and the inner metal ring; the annular PCB is arranged between the outer metal ring and the inner metal ring; a feeding point arranged on the annular PCB is connected with the outer metal ring. The inner metal ring and the outer metal ring are supported through the annular non-metal filling. A first gap vertically penetrating the wall of the ring is formed in the outer metal ring. A series matching capacitor is arranged between the feeding point and the outer metal ring. An antenna matching network is further arranged on the annular PCB, and the antenna matching network is connected between the feeding point and a radio frequency transceiving port. The outer metal ring and the inner metal ring are short-circuited through two pairs of metal connecting lines, and the two pairs of metal connecting lines are oppositely arranged on the vertical two ends of the outer metal ring and the inner metal ring.

2. The ring antenna for a smart ring according to claim 1, wherein The outer metal ring and the inner metal ring are short-circuited through one pair of metal connecting lines.

3. The ring antenna for a smart ring according to claim 1, wherein Each pair of metal connecting lines is arranged on a straight line in the vertical direction of the outer metal ring.

4. The loop antenna for a smart ring according to claim 2 or 3, wherein The annular non-metal filling is an annular ceramic block.

5. The ring antenna for a smart ring according to claim 1, wherein The annular ceramic block is two, and is arranged on the vertical two ends of the inner metal ring and the outer metal ring respectively; and the shape of the annular ceramic block is the same as the shape of the gap between the inner metal ring and the outer metal ring.

6. The loop antenna for a smart ring according to claim 5, wherein The feeding point arranged on the annular PCB is connected with the outer metal ring through a metal sheet or a metal probe.

7. The ring antenna for a smart ring according to claim 1, wherein The application relates to a ring antenna applied to a smart ring and a smart ring circuit, wherein the ring antenna applied to the smart ring comprises an inner metal ring, an annular PCB, an outer metal ring and an annular non-metal filling.

8. A smart ring, characterized by ​

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