Wearable device and positioning antenna thereof

Abstract

The present invention relates to the field of electronic communications technology, and provides a positioning antenna and a wearable device. The positioning antenna includes: a ring-shaped radiator, the ring-shaped radiator is coupled to a coupling body, and the coupling body extends along the edge of the ring-shaped radiator; a feeding branch coupled to the ring-shaped radiator, and the end of the feeding branch away from the ring-shaped radiator is used to access a radio frequency signal; a grounding branch coupled to the ring-shaped radiator, and the end of the grounding branch away from the ring-shaped radiator is used to access a ground signal. The ring-shaped radiator of the positioning antenna can generate right-handed circularly polarized radiation, so that the positioning antenna can better receive navigation satellite signals. At the same time, the right-handed circularly polarized radiation generated by the ring-shaped radiator can also filter left-handed circularly polarized navigation satellite signals reflected by high-rise buildings or the ground to reduce multipath interference, thereby effectively improving the positioning accuracy of the positioning antenna of the wearable device.

Description

Technical Field

[0001] The present invention relates to the field of electronic communication technology, and in particular to a wearable device and a positioning antenna thereof. Background Art

[0002] With the continuous development of electronic communication technology, wearable devices are becoming more and more popular.

[0003] However, the positioning accuracy of wearable devices has long been criticized. Traditional wearable device positioning antennas are mostly linearly polarized. However, the signals from navigation satellites become right-hand circularly polarized after passing through the ionosphere. Therefore, the wearable device's positioning antenna cannot fully receive the navigation satellite signals. Furthermore, after odd reflections from the ground, tall buildings, trees, etc., the navigation satellite signals become left-hand circularly polarized. The resulting multipath interference further reduces the positioning accuracy of the wearable device. Summary of the Invention

[0004] The purpose of the present invention is to provide a wearable device and a positioning antenna thereof, aiming to solve the technical problem of low positioning accuracy of existing wearable devices.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A positioning antenna, comprising:

[0007] an annular radiator, wherein the annular radiator is coupled to a coupling body, and the coupling body extends along an edge of the annular radiator;

[0008] a feeding branch coupled to the annular radiator, wherein one end of the feeding branch away from the annular radiator is used for receiving a radio frequency signal;

[0009] A grounding branch coupled to the ring-shaped radiator, wherein one end of the grounding branch away from the ring-shaped radiator is used for receiving a ground electrical signal.

[0010] The positioning antenna provided by the present invention has at least the following beneficial effects: coupling and feeding are performed through the feeding branch, the grounding branch is coupled to the ground, and at the same time, the coupling body extending along the edge of the annular radiator is coupled with the annular radiator to stimulate the two radiation modes of the annular radiator. The two radiation modes have the same amplitude and a phase difference of 90 degrees, that is, the annular radiator generates right-handed circularly polarized radiation, so that the positioning antenna can better receive navigation satellite signals. At the same time, the right-handed circularly polarized radiation generated by the annular radiator can also filter the left-handed circularly polarized navigation satellite signals reflected by high-rise buildings or the ground to reduce multipath interference, thereby effectively improving the positioning accuracy of the positioning antenna of the wearable device.

[0011] In one embodiment, the coupling body is a communication antenna.

[0012] In one embodiment, the length of the coupling body corresponds to the operating wavelength of the ring radiator.

[0013] In one embodiment, the positioning antenna further includes a plurality of inductive devices disposed on the periphery of the annular radiator.

[0014] In one embodiment, the inductor device is a lumped inductor or a distributed inductor.

[0015] In one embodiment, the distance between the feeding branch and the grounding branch along the periphery of the annular radiator is 0.125-0.375 times the operating wavelength of the annular radiator.

[0016] In one embodiment, the feeding branch is a T-shaped structure or an L-shaped structure.

[0017] In one embodiment, the feeding branch includes a feeding arm and a capacitor, and the capacitor is provided at one end of the feeding arm close to the ring-shaped radiator.

[0018] In one embodiment, the grounding branch is a T-shaped structure or an L-shaped structure.

[0019] To achieve the above-mentioned purpose, the present invention also provides a wearable device, including a circuit board and the above-mentioned positioning antenna, the feed source of the feeding branch of the positioning antenna is connected to the radio frequency port of the circuit board, and the grounding pin of the grounding branch of the positioning antenna is connected to the ground port of the circuit board.

[0020] Since the above-mentioned wearable device adopts all the embodiments of the above-mentioned positioning antenna, it has at least all the beneficial effects of the above-mentioned embodiments, which will not be described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a wearable device provided in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 The structure diagram of the wearable device shown is shown with the housing removed;

[0024] Figure 3 for Figure 1 The structure diagram of the wearable device shown is after removing the housing and coupling body;

[0025] Figure 4 A schematic diagram of the S parameters of a positioning antenna provided in an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the two-dimensional axial ratio of the positioning antenna provided in an embodiment of the present invention;

[0027] Figure 6 A two-dimensional axial ratio simulation diagram of the positioning antenna provided by an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the two-dimensional right-hand circular polarization gain of a positioning antenna provided in an embodiment of the present invention;

[0029] Figure 8 This is the two-dimensional radiation pattern of the positioning antenna provided in an embodiment of the present invention.

[0030] Among them, the reference numerals in the figures are:

[0031] 10. Positioning antenna, 11. Ring radiator, 111. First edge, 112. Second edge, 12. Coupler, 13. Feed branch, 131. First coupling section, 132. Feed source section, 14. Grounding branch, 141. Second coupling section, 142. Grounding section, 15. Inductor, 20. Circuit board, 30. Housing. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] Example 1

[0037] Please combine Figures 1 to 3 As shown, a wearable device includes a positioning antenna 10 and a circuit board 20 having a radio frequency port and a ground electrical port. The wearable device receives navigation satellite signals through the positioning antenna 10.

[0038] Specifically, please combine Figure 1 As shown, the wearable device further includes a housing 30 , and the circuit board 20 and the positioning antenna 10 are both disposed in the housing 30 .

[0039] The positioning antenna 10 is described in detail below with reference to the accompanying drawings.

[0040] Please combine Figures 1 to 3 As shown, a positioning antenna 10 includes a ring radiator 11, and a coupling body 12, a feeding branch 13 and a grounding branch 14 respectively coupled to the ring radiator 11. The ring radiator 11 is coupled to the coupling body 12, and the coupling body 12 extends along the edge of the ring radiator 11. The end of the feeding branch 13 away from the ring radiator 11 is connected to the RF port of the circuit board 20 to access the RF signal. The end of the grounding branch 14 away from the ring radiator 11 is connected to the ground port of the circuit board 20 to access the ground signal.

[0041] The above-mentioned positioning antenna 10 is coupled and fed through the feeding branch 13, and the grounding branch 14 is coupled to the ground. At the same time, the coupling body 12 extending along the edge of the ring radiator 11 is coupled with the ring radiator 11, thereby exciting the two radiation modes of the ring radiator 11. The two radiation modes have the same amplitude and a phase difference of 90 degrees, that is, the ring radiator 11 generates right-handed circularly polarized radiation, so that the positioning antenna 10 can better receive navigation satellite signals. At the same time, the right-handed circularly polarized radiation generated by the ring radiator 11 can also filter the left-handed circularly polarized navigation satellite signals reflected by high-rise buildings or the ground to reduce multipath interference, thereby effectively improving the positioning accuracy of the positioning antenna 10 of the wearable device.

[0042] To achieve resonance within the operating frequency band of 1575 MHz, the circumference of the ring radiator 11 is designed to be equal to the operating wavelength. Of course, the circumference of the ring radiator 11 can also be adjusted according to the operating frequency band of the positioning antenna 10, and is not specifically limited here.

[0043] Specifically, please combine Figures 1 to 3 As shown, the ring radiator 11 is a square ring structure or a circular ring structure. Of course, the ring radiator 11 can also adopt an orthogonal symmetrical shape structure such as an elliptical ring structure, a rounded square structure, a rectangular structure, a rounded rectangular structure, etc., which is not specifically limited here.

[0044] In this embodiment, the coupling body 12 is a communication antenna. Specifically, the communication antenna can be another communication antenna in the wearable device, such as an LTE (Long Term Evolution) antenna or a WIFI (Wireless Fidelity) antenna. In this case, the other communication antenna in the wearable device, such as an LTE (Long Term Evolution) antenna or a WIFI (Wireless Fidelity) antenna, is extended along the edge of the annular radiator 11 to produce a coupling effect. This reduces the risk of the other antenna in the wearable device degrading the axial ratio of the positioning antenna 10, and also reduces the number of components in the wearable device, making the wearable device more compact.

[0045] Of course, the positioning antenna 10 may also use a structural metal part or exposed copper on a circuit board as the coupling body 12 to couple with the ring radiator 11 , which is not specifically limited here.

[0046] In this embodiment, the length of the coupler 12 corresponds to the operating wavelength of the ring radiator 11. Specifically, the length of the coupler 12 is substantially equal to the operating wavelength of the ring radiator 11, or the length of the coupler 12 is 0.25 times the operating wavelength of the ring radiator 11. Of course, the length of the coupler 12 can also be adjusted according to actual needs and is not specifically limited here.

[0047] In this embodiment, please combine Figures 1 to 3 As shown, the positioning antenna 10 also includes multiple inductors 15 disposed around the periphery of the ring radiator 11. Specifically, the inductors 15 are evenly spaced along the edge of the ring radiator 11. Because wearable devices often have compact internal mounting spaces, the placement of multiple inductors 15 on the main body of the ring radiator 11 reduces the size of the positioning antenna 10, effectively achieving miniaturization and adapting it to various wearable devices.

[0048] from Figures 1 to 3 As can be seen in the figure, four inductors 15 are provided on the ring radiator 11, but the invention is not limited thereto. The positioning antenna 10 can also be provided with different numbers of inductors 15 according to different size requirements.

[0049] Specifically, the inductor 15 is a lumped inductor or a distributed inductor. When the inductor 15 is a distributed inductor, the edge of the ring radiator 11 has a wavy structure. This ensures that the circumference of the ring radiator 11 reaches the set value while reducing the space occupied by the ring radiator 11, thereby reducing the size of the positioning antenna 10, effectively achieving miniaturization, and making the positioning antenna 10 suitable for different types of wearable devices.

[0050] In this embodiment, the distance between the feeding branch 13 and the grounding branch 14 along the periphery of the annular radiator 11 is 0.1 to 0.5 times the operating wavelength of the annular radiator 11, and is generally selected to be 0.125 to 0.375 times, which can effectively ensure that the two radiation modes of the positioning antenna 10 have the same amplitude characteristics and a 90-degree phase difference characteristic.

[0051] When the annular radiator is a square structure, a rounded square structure, a rectangular structure or a rounded rectangular structure, the two branches are respectively coupled to two adjacent sides of the annular radiator.

[0052] In this embodiment, the feeding branch 13 is a T-shaped structure or an L-shaped structure.

[0053] Specifically, please combine Figures 1 to 3As shown, the feeding branch 13 includes a first coupling section 131 for coupling and connecting to the annular radiator 11 and a feed section 132 connected to the first coupling section 131, and the end of the feed section 132 away from the first coupling section 131 is connected to the feeding port of the circuit board 20, and the long side of the first coupling section 131 is coupled and connected to the annular radiator 11.

[0054] More specifically, in the case where the feeding branch 13 is a T-shaped structure, as shown in FIG. Figures 1 to 3 As shown, the horizontal segment of the feeding branch 13 serves as the above-mentioned first coupling segment 131 to be coupled and connected to the annular radiator 11, and the vertical segment of the feeding branch 13 serves as the above-mentioned feed source segment 132 to be connected to the feeding port of the circuit board 20; in the case where the feeding branch 13 is an L-shaped structure, a line segment of the feeding branch 13 serves as the above-mentioned first coupling segment 131 to be coupled and connected to the annular radiator 11, and another line segment of the feeding branch 13 serves as the above-mentioned feed source segment 132 to be connected to the feeding port of the circuit board 20.

[0055] In this embodiment, the grounding branch 14 is a T-shaped structure or an L-shaped structure.

[0056] Specifically, please combine Figures 1 to 3 As shown, the grounding branch 14 includes a second coupling segment 141 for coupling with the annular radiator 11 and a grounding segment 142 connected to the second coupling segment 141. The end of the grounding segment 142 away from the second coupling segment 141 is connected to the ground electrical port of the circuit board 20, and the long side of the second coupling segment 141 is coupled with the annular radiator 11.

[0057] More specifically, in the case where the grounding branch 14 is a T-shaped structure, the horizontal segment of the grounding branch 14 serves as the above-mentioned second coupling segment 141 to be coupled and connected to the annular radiator 11, and the vertical segment of the grounding branch 14 serves as the above-mentioned grounding segment 142 to be connected to the ground electrical port of the circuit board 20; in the case where the grounding branch 14 is an L-shaped structure, a line segment of the grounding branch 14 serves as the above-mentioned second coupling segment 141 to be coupled and connected to the annular radiator 11, and another line segment of the grounding branch 14 serves as the above-mentioned grounding segment 142 to be connected to the ground electrical port of the circuit board 20.

[0058] Example 2

[0059] This embodiment differs from the first embodiment in that the feed branch 13 includes a feed arm and a capacitor, with the capacitor being located at one end of the feed arm closest to the ring radiator 11. The end of the feed arm, which is further away from the capacitor, is connected to the RF port of the circuit board 20, while the other end of the feed arm is connected to the ring radiator 11 via the capacitor.

[0060] from Figure 4It can be seen that the positioning antenna 10 resonates at the GPS L1 frequency band of -1575 MHz, indicating that the positioning antenna 10 effectively realizes right-hand circular polarization radiation and has good reception of navigation satellite signals.

[0061] from Figure 5 and Figure 6 It can be seen that when the above-mentioned positioning antenna 10 operates in the GPS L1 frequency band -1575MHz, the axial ratio of the top of the positioning antenna 10 (phi=0°, theta=0°) is below 1.5dB. When the above-mentioned positioning antenna 10 operates in the GPS L1 frequency band -1575MHz and the cross section is phi=0°, 90°, within the range of θ=-60~70°, the axial ratio of the positioning antenna 10 is less than 10dB, indicating that the axial ratio characteristics of the above-mentioned positioning antenna 10 are good and meet the performance requirements of the positioning antenna 10.

[0062] from Figure 7 and Figure 8 It can be seen that when the above-mentioned positioning antenna 10 operates in the GPS L1 frequency band -1575MHz, the right-hand circular polarization gain of the top of the positioning antenna 10 (phi=0°, theta=0°) is about -4.3dB, which is about 3dB higher than the gain of the traditional linear polarization antenna. The positioning effect of the above-mentioned positioning antenna 10 is better than that of the traditional linear polarization antenna.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A positioning antenna, characterized in that: include: an annular radiator, wherein the annular radiator is coupled to a coupling body, and the coupling body extends along an edge of the annular radiator; a feeding branch coupled to the annular radiator, wherein one end of the feeding branch away from the annular radiator is used for receiving a radio frequency signal; a grounding branch coupled to the ring-shaped radiator, wherein an end of the grounding branch away from the ring-shaped radiator is used to access a ground electrical signal; The coupling body, the feeding branch and the grounding branch are all coupled to the ring radiator to excite two radiation modes of the ring radiator. The two radiation modes have the same amplitude and a phase difference of 90 degrees, so that the ring radiator generates right-handed circularly polarized radiation.

2. The positioning antenna according to claim 1, wherein: The coupling body is a communication antenna.

3. The positioning antenna according to claim 1, wherein: The length of the coupling body corresponds to the operating wavelength of the ring radiator.

4. The positioning antenna according to claim 1, wherein: The positioning antenna further includes a plurality of inductive devices arranged on the periphery of the annular radiator.

5. The positioning antenna according to claim 4, characterized in that: The inductor device is a lumped inductor or a distributed inductor.

6. The positioning antenna according to claim 1, characterized in that: The distance between the feeding branch and the grounding branch along the periphery of the annular radiator is 0.125-0.375 times the working wavelength of the annular radiator.

7. The positioning antenna according to any one of claims 1 to 6, characterized in that: The feeding branch is a T-shaped structure or an L-shaped structure.

8. The positioning antenna according to any one of claims 1 to 6, characterized in that: The feeding branch includes a feeding arm and a capacitor, and the capacitor is arranged at one end of the feeding arm close to the ring-shaped radiator.

9. The positioning antenna according to any one of claims 1 to 6, characterized in that: The grounding branch is a T-shaped structure or an L-shaped structure.

10. A wearable device, characterized in that: It comprises a circuit board and a positioning antenna as described in any one of claims 1 to 9, wherein the feed source of the feeding branch of the positioning antenna is connected to the RF port of the circuit board, and the grounding pin of the grounding branch of the positioning antenna is connected to the ground port of the circuit board.

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