Antenna device and electronic device

Abstract

The application relates to an antenna device and an electronic device, the antenna device comprising a ground plate and a radiator, the ground plate comprising at least three feed ports, the radiator being connected to the ground plate through the feed ports, the radiator being located in a region between every two feed ports to form a first current path and a second current path, an electrical length of the first current path being half of an electrical length of the second current path, the first current path being used for transmitting a half-wave common-mode current, and the second current path being used for transmitting a one-wave differential-mode current, and the self-decoupling effect between multiple feed ports can be realized.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and in particular to an antenna device and electronic device. Background Technology

[0002] MIMO (Multiple-Input Multiple-Output) technology refers to using multiple transmit and receive antennas at both the transmitting and receiving ends, enabling signals to be transmitted and received through these antennas, thereby improving communication quality. It makes full use of space resources, achieving multiple transmissions and receptions through multiple antennas, and can significantly increase system channel capacity without increasing spectrum resources or antenna transmit power. However, there is a problem of mutual coupling between multiple antenna elements, which leads to a deterioration in the radiation and diversity performance of each antenna element. To solve the mutual coupling problem, existing technologies add slot-coupled short-circuit (GCS) stubs to the antenna. These stubs form a bandpass resonant structure, limiting the influence range of the current induced by each antenna element. However, this requires additional structures, making the antenna structure more complex and difficult to manufacture. Summary of the Invention

[0003] This application provides an antenna device and electronic device that can achieve self-decoupling between multiple feed ports.

[0004] The first aspect of this application provides an antenna device, which includes a ground plane and a radiator. The ground plane includes at least three feed ports, and the radiator is connected to the ground plane through the feed ports. The region between every two feed ports of the radiator forms a first current path and a second current path. The electrical length of the first current path is half the electrical length of the second current path. The first current path is used to transmit a half-wavelength common-mode current, and the second current path is used to transmit a one-wavelength differential-mode current.

[0005] In the antenna device of this application, any feed port can transmit current to the radiator, and the current can reach another feed port through the radiator. There are two current paths in the region of the radiator between every two feed ports: a first current path and a second current path. The electrical length of the first current path is half the electrical length of the second current path. Mathematically, the excitation current of any feed port can be decomposed into a pair of common-mode currents and a pair of differential-mode currents. When the first current path transmits a half-wavelength common-mode current excited by any feed port, and when the second current path transmits a one-wavelength differential-mode current excited by the same feed port, the common-mode current and differential-mode current can be equal in amplitude and out of phase (cancel each other) at other feed ports. That is, the current excited by any feed port does not flow into other feed ports, resulting in self-decoupling between every two feed ports, thereby improving the radiation performance of the antenna device and the communication quality of the electronic equipment. Therefore, compared with the existing decoupling scheme that adds a slot-coupled short-circuit (GCS) stub, the self-decoupling scheme of this application has a simpler structure and is easier to manufacture.

[0006] In one possible design, the radiator includes a first metal pillar, through which the radiator is connected to each feed port.

[0007] Each feed port is connected to a first metal post, which supports the radiator, maintaining a gap between the radiator and the floor, providing a clean space (clearance) to ensure the radiator is not interfered with by other components on the floor. Simultaneously, the first metal post also serves as part of the first and second current paths, transmitting current through the connected feed ports.

[0008] In one possible design, the antenna device includes three feed ports, and the radiator includes a ring radiator, with the three feed ports evenly distributed along the circumference of the ring radiator.

[0009] The antenna device has three feed ports, each connected to a ring radiator via a first metal post. The feed ports are spaced 120° apart along the circumference of the ring radiator. Therefore, one-third of the ring radiator between each pair of first metal posts forms a first current path, and two-thirds of the ring radiator between each pair of first metal posts forms a second current path, such that the electrical length of the first current path is approximately equal to half the electrical length of the second current path. When the first current path between each pair of feed ports carries a half-wavelength common-mode current, and when the second current path between each pair of feed ports carries a one-wavelength differential-mode current, the feed ports are self-decoupled. The ring radiator of this application can serve as a common radiator between each pair of feed ports, eliminating the need for separate first and second current paths between each pair of feed ports, thus simplifying the structure and making the antenna device easier to manufacture.

[0010] In one possible design, the length L1 of each first metal post is 5 mm, and the distance R0 between the end of each first metal post connected to the annular radiator and the center O1 of the annular radiator is 26 mm.

[0011] The length of the first current path (the sum of the lengths L1 of the two first metal pillars and the arc length of one-third of the ring radiator) is approximately 64 mm, which is approximately half the wavelength of a 2.4 GHz signal. The length of the second current path (the sum of the lengths L1 of the two first metal pillars and the arc length of two-thirds of the ring radiator) is approximately 119 mm, which is approximately one wavelength of a 2.4 GHz signal. Therefore, the antenna device of this application can transmit 2.4 GHz signals without mutual coupling.

[0012] In one possible design, the outer radius R1 of the annular radiator is 27 mm, and the inner radius R2 of the annular radiator is 25 mm.

[0013] A ring radiator of this size can meet the basic performance requirements for transmitting signals in the 2.4 GHz band.

[0014] In one possible design, the antenna device also includes a first equivalent capacitor, and the radiator also includes a second metal post connected to the ground via the first equivalent capacitor.

[0015] The decoupling frequency of the antenna device of this application is tuned using the first equivalent capacitance, thereby meeting the requirements for transmitting signals in different frequency bands.

[0016] In one possible design, the second metal pillar is located in the middle of the area between every two feed ports.

[0017] Since the point of maximum electric field is located in the middle of the region between two adjacent feed ports (the annular radiator between each two feed ports), connecting the second metal pillar at this location, and then connecting the second metal pillar to the ground through the first equivalent capacitance, achieves the best effect in tuning the decoupling frequency of the antenna device.

[0018] In one possible design, the antenna device also includes a dielectric substrate, an annular radiator attached to the dielectric substrate, and a first metal pillar passing through the dielectric substrate.

[0019] The dielectric substrate is used to support the annular radiator and maintain its structural stability. The dielectric substrate can be a flame-retardant (FR-4) dielectric board, a Rogers dielectric board, a hybrid of Rogers and FR-4 dielectric boards, etc. Here, FR-4 is a designation for a flame-retardant material grade, and the Rogers dielectric board is a high-frequency board.

[0020] In one possible design, the antenna device includes three feed ports, each feed port is connected to a first metal post, and the radiator is a circular radiator with a diameter D1 of 0.75λ. Along the circumference of the circular radiator, the end of each first metal post away from the feed port is uniformly connected to the circular radiator.

[0021] The antenna device has three feed ports, each connected to a circular radiator via a first metal post. The feed ports are spaced 120° apart along the circumference of the radiator. Testing showed that when the radiator diameter D1 is 0.75λ (λ being the wavelength of the transmitted signal), approximately one-third of the region of the circular radiator between each pair of feed ports effectively forms a first current path with an electrical length of half a wavelength, capable of transmitting half a wavelength of common-mode current. Approximately two-thirds of the region between each pair of feed ports effectively forms a second current path with an electrical length of one wavelength, capable of transmitting one wavelength of differential-mode current. This prevents current from flowing from one feed port to the others, decoupling the feed ports and thus improving the antenna device's radiation performance and the communication quality of the electronic equipment.

[0022] In one possible design, the diameter D1 of the circular radiator is 81.8 mm, and the distance R3 between the first metal column connected to one end of the circular radiator and the center O2 of the circular radiator is greater than or equal to 15 mm.

[0023] Antenna devices of this size are capable of transmitting 2.4 GHz band signals without mutual coupling.

[0024] In one possible design, the distance R3 is 25mm.

[0025] The decoupling effect between every two power supply ports 2 is optimal when the distance R3 is 25mm.

[0026] In one possible design, the length of the first metal column is 2 mm.

[0027] In the antenna device of this application, the distance between the circular radiator and the ground is 2mm. Compared with the prior art, the antenna device of this application is thinner and lighter, and the isolation between the three feed ports does not deteriorate.

[0028] In one possible design, a second equivalent capacitor is connected to the end of each first metal pillar furthest from the circular radiator, and the second equivalent capacitor is connected to the feed port.

[0029] Impedance matching is achieved by using a second equivalent capacitor, thereby improving signal transmission quality.

[0030] In one possible design, the antenna device also includes a dielectric substrate, a circular radiator attached to the dielectric substrate, and a first metal pillar passing through the dielectric substrate.

[0031] The dielectric substrate can support the circular radiator and maintain the structural stability of the circular radiator.

[0032] A second aspect of this application provides an electronic device that includes the antenna device described above and has the aforementioned effects.

[0033] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0034] Figure 1 A schematic diagram of the antenna device provided in this application in a first specific embodiment;

[0035] Figure 2 for Figure 1 Side view of the antenna assembly along direction A;

[0036] Figure 3 for Figure 1 A schematic diagram of the first current path and the second current path flowing from the first feed port to the second feed port.

[0037] Figure 4 for Figure 3 Current distribution diagram induced at the first feed port;

[0038] Figure 5 for Figure 1 A schematic diagram of the first current path and the second current path flowing from the first feed port to the third feed port.

[0039] Figure 6 for Figure 1 A schematic diagram of the first current path and the second current path flowing from the second feed port to the first feed port.

[0040] Figure 7 for Figure 1 A schematic diagram of the first and second current paths flowing from the second feed port to the third feed port.

[0041] Figure 8 for Figure 1 A schematic diagram of the first current path and the second current path flowing from the third feed port to the first feed port.

[0042] Figure 9 for Figure 1 A schematic diagram of the first current path and the second current path flowing from the third feed port to the second feed port.

[0043] Figure 10 for Figure 1 Return loss-frequency relationship diagram of the antenna device;

[0044] Figure 11 for Figure 1 A schematic diagram of the structure of the antenna device, wherein the antenna device includes a first equivalent capacitance;

[0045] Figure 12 for Figure 11 A cross-sectional view of the antenna assembly along direction B;

[0046] Figure 13 for Figure 11 Return loss-frequency relationship diagram of the antenna device;

[0047] Figure 14 A schematic diagram of the antenna device provided in this application in a second specific embodiment;

[0048] Figure 15 for Figure 14 Side view of the antenna assembly along direction C;

[0049] Figure 16 for Figure 14 A schematic diagram of the first current path and the second current path flowing from the first feed port to the second feed port.

[0050] Figure 17 for Figure 14 Current distribution diagram induced at the first feed port;

[0051] Figure 18 for Figure 14 Return loss-frequency relationship diagram for every two feed ports in the antenna device;

[0052] Figure 19for Figure 14 Return loss-frequency relationship diagram of the feed port in the antenna device at different locations.

[0053] Figure label:

[0054] 1-Floor;

[0055] 2-Power supply port;

[0056] 21 - First power supply port;

[0057] 22 - Second power supply port;

[0058] 23 - Third feed port;

[0059] 3-Radiator;

[0060] 31-Ring radiator;

[0061] 32 - First metal column;

[0062] 33 - Second metal column;

[0063] 34- Circular radiator;

[0064] 4-First equivalent capacitance;

[0065] 5-Dielectric substrate;

[0066] P1 - First current path;

[0067] P2 - Second current path.

[0068] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0069] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0070] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0072] This application provides an electronic device. The technical solution provided in the embodiments of this application is applicable to electronic devices employing one or more of the following communication technologies: Bluetooth (BT) communication technology, Global Positioning System (GPS) communication technology, Wireless Fidelity (WiFi) communication technology, Global System for Mobile Communications (GSM) communication technology, Wideband Code Division Multiple Access (WCDMA) communication technology, Long Term Evolution (LTE) communication technology, 5G communication technology, and other future communication technologies. The electronic device in the embodiments of this application can be a mobile phone, tablet computer, laptop computer, smart home device, smart bracelet, smartwatch, smart helmet, smart glasses, etc. The electronic device can also be a handheld device with wireless communication capabilities, a computing device, or other processing devices connected to a wireless modem, an in-vehicle device, an electronic device in a 5G network, or an electronic device in a future evolved public land mobile network (PLMN), etc. The embodiments of this application are not limited to these categories.

[0073] The electronic device in this application includes an antenna device, please refer to... Figures 1-3 As shown, the antenna device includes a ground plane 1 and a radiator 3. The ground plane 1 includes at least three feed ports 2. The radiator 3 is connected to the ground plane 1 through the feed ports 2. The area between every two feed ports 2 of the radiator 3 forms a first current path P1 and a second current path P2. The electrical length of the first current path P1 is half the electrical length of the second current path P2. The first current path P1 is used to transmit a half-wavelength common-mode current, and the second current path P2 is used to transmit a one-wavelength differential-mode current.

[0074] In this embodiment, any feed port 2 can transmit current to the radiator 3, and the current can reach another feed port 2 through the radiator 3. There are two current paths in the region of the radiator 3 between every two feed ports 2: a first current path P1 and a second current path P2. The electrical length of the first current path P1 is half the electrical length of the second current path P2. Please refer to... Figure 4 As shown, the excitation current of any feed port 2 can be mathematically decomposed into a pair of common-mode currents and a pair of differential-mode currents. When the first current path P1 transmits a half-wavelength common-mode current excited by any feed port 2, and when the second current path P2 transmits a one-wavelength differential-mode current excited by the same feed port 2, the common-mode current and differential-mode current can be equal in amplitude and opposite in phase (cancel each other) in other feed ports 2. That is, the current excited by any feed port 2 does not flow into other feed ports 2, making each pair of feed ports 2 self-decoupled, thereby improving the radiation performance of the antenna device and the communication quality of the electronic equipment. Therefore, compared with the existing decoupling scheme that adds a slot-coupled short-circuit (GCS) stub, the self-decoupling scheme of this application has a simpler structure and is easier to manufacture.

[0075] The first current path P1 and the second current path P2 can be straight, curved, or broken, or other shapes.

[0076] Ground plane 1 can refer to at least a portion of any grounding layer, ground plane, or grounding metal layer within an electronic device (such as a mobile phone), or at least a portion of any combination of any of the aforementioned grounding layers, ground planes, or grounding components. "Ground plane" can be used for grounding components within an electronic device. In one embodiment, "ground plane" can be the grounding layer of a circuit board in an electronic device, or a grounding metal layer formed by a ground plane formed within the frame of the electronic device or a metal film formed beneath the screen. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14-layer board with 8, 10, 12, 13, or 14 layers of conductive material, or components separated and electrically insulated by dielectric or insulating layers such as fiberglass or polymers. In one embodiment, the circuit board includes a dielectric substrate, a grounding layer, and a trace layer, with the trace layer and grounding layer electrically connected via vias. In one embodiment, components such as displays, touchscreens, input buttons, transmitters, processors, memory, batteries, charging circuits, and system-on-chip (SoC) architectures can be mounted on or connected to a circuit board; or electrically connected to trace layers and / or ground layers in the circuit board. For example, an RF source is disposed on a trace layer.

[0077] Any of the aforementioned grounding layers, ground planes, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material may be any of the following: copper, aluminum, stainless steel, brass and their alloys, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate and tin-plated copper, graphite-impregnated cloth, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. Those skilled in the art will understand that grounding layers / ground planes / grounding metal layers may also be made of other conductive materials.

[0078] The antenna device of this application includes two embodiments, and the first embodiment is described first.

[0079] Specifically, please refer to Figures 1-3 As shown, the radiator 3 includes a first metal pillar 32, and the radiator 3 is connected to each feed port 2 through the first metal pillar 32.

[0080] In this embodiment, each power supply port 2 is connected to a first metal post 32. The first metal post 32 supports the radiator 3, maintaining a gap between the radiator 3 and the floor 1, thus providing a clean space (clearance) for the radiator 3 and ensuring that the radiator 3 is not interfered with by other components on the floor 1. Simultaneously, the first metal post 32 also serves as part of the first current path P1 and the second current path P2, transmitting the current from the connected power supply port 2.

[0081] Among them, Figure 1 The first metal pillar 32 is located at the same position as the feed port 2.

[0082] More specifically, please refer to Figures 1-3 As shown, the antenna device includes three feed ports 2 and the radiator 3 includes a ring radiator 31. The three feed ports 2 are evenly distributed in the circumferential direction of the ring radiator 31.

[0083] In this embodiment, the three feed ports 2 of the antenna device are each connected to the annular radiator 31 via a first metal post 32. The distribution positions of every two feed ports 2 are 120° apart along the circumference of the annular radiator 31. Therefore, one-third of the portion of the annular radiator 31 between every two first metal posts 32 forms the first current path P1, and two-thirds of the portion of the annular radiator 31 between every two first metal posts 32 forms the second current path P2, such that the electrical length of the first current path P1 is approximately equal to half the electrical length of the second current path P2. When the first current path P1 between every two feed ports 2 transmits a half-wavelength common-mode current, and when the second current path P2 between every two feed ports 2 transmits a one-wavelength differential-mode current, the two feed ports 2 are self-decoupled. The annular radiator 31 of this application can serve as a common radiator 3 between every two feed ports, eliminating the need for separate first current paths P1 and second current paths P2 between every two feed ports 2, making the antenna device of this application simpler and easier to manufacture.

[0084] Please refer to Figures 3-4 As shown, the three feed ports 2 are the first feed port 21, the second feed port 22, and the third feed port 23. The first feed port 21 can transmit a half-wavelength common-mode current to the second feed port 22 through the first current path P1. The first feed port 21 can also transmit a one-wavelength differential-mode current to the second feed port 22 through the second current path P2. The common-mode current and differential-mode current excited by the first feed port 21 cancel each other out at the second feed port 22, thereby achieving decoupling.

[0085] Similarly, such as Figure 5 As shown, the common-mode current and differential-mode current generated at the first feed port 21 cancel each other out at the third feed port 23. Figure 6 As shown, the common-mode current and differential-mode current excited by the second feed port 22 cancel each other out at the first feed port 21. Figure 7 As shown, the common-mode current and differential-mode current excited at the second feed port 22 cancel each other out at the third feed port 23. Figure 8 As shown, the common-mode current and differential-mode current excited by the third feed port 23 cancel each other out at the first feed port 21. Figure 9 As shown, the common-mode current and differential-mode current excited by the third feed port 23 cancel each other out by the second feed port 22. Therefore, the first feed port 21, the second feed port 22 and the third feed port 23 form three antennas with the same frequency, which can work simultaneously or be used in a switching manner.

[0086] like Figure 10As shown, the absolute values ​​of the isolation of the antenna device in this embodiment for transmitting 2.4GHz, 2.44GHz and 2.48GHz signals are all greater than 10dB, indicating that the antenna device has good radiation performance.

[0087] Antenna isolation is a physical quantity used to measure the degree of mutual coupling between antennas. Assuming two antennas form a two-port network, the isolation between the two antennas is represented by their S21 and S12 parameters. Antenna isolation can be expressed using these S21 and S12 parameters. These parameters are typically negative. The smaller the S21 and S12 parameters, the greater the isolation between the antennas and the less mutual coupling; conversely, the larger the S21 and S12 parameters, the smaller the isolation between the antennas and the greater the mutual coupling.

[0088] Please refer to Figures 1-2 As shown, the length L of each first metal post 32 is 5mm, and the distance R0 between the end of each first metal post 32 connected to the annular radiator 31 and the center O1 of the annular radiator 31 is 26mm.

[0089] In this embodiment, the length of the first current path P1 (the sum of the lengths L1 of the two first metal pillars 32 and the arc length of one-third of the annular radiator 31) is approximately 64 mm, which is approximately half the wavelength of a 2.4 GHz signal. The length of the second current path P2 (the sum of the lengths of the two first metal pillars 32 and the arc length of two-thirds of the annular radiator 31) is approximately 119 mm, which is approximately one wavelength of a 2.4 GHz signal. Therefore, the antenna device of this embodiment can transmit 2.4 GHz signals without mutual coupling.

[0090] Of course, depending on the need to transmit signals in different frequency bands, the electrical length of the first current path P1 and the electrical length of the second current path P2 in the antenna device of this application can be changed so that their electrical lengths are equal to half a wavelength and a wavelength of the signal to be transmitted, respectively.

[0091] Furthermore, under the condition of transmitting signals in the same frequency band, the radius R0 of the annular radiator 31 can be increased or decreased, and the length L1 of the first metal column 32 can be decreased or increased accordingly, so that the size of the antenna device of this application can be flexibly changed to meet the assembly requirements of different electronic devices.

[0092] Please refer to Figure 1 As shown, the outer radius R1 of the annular radiator 31 can be 27 mm, and the inner radius R2 of the annular radiator 31 can be 25 mm. The annular radiator of this size can meet the basic performance requirements for transmitting 2.4 GHz frequency band signals.

[0093] Please refer to Figures 11-12As shown, the antenna device also includes a first equivalent capacitor 4, and the radiator 3 also includes a second metal pillar 33. The second metal pillar 33 is connected to the ground 1 through the first equivalent capacitor 4. The decoupling frequency of the antenna device of this application is tuned by the first equivalent capacitor 4, thereby meeting the requirements for transmitting signals of different frequency bands.

[0094] Please refer to Figure 11 As shown, the second metal pillar 33 is located at the same position as the first equivalent capacitor 4. For ease of understanding, Figure 11 Only the first equivalent capacitance 4 is shown in the image.

[0095] Since the number of power supply ports 2 in the above embodiment is three, the first equivalent capacitor 4 in this embodiment includes three, which are located in the area between every two power supply ports 2.

[0096] In addition, the first equivalent capacitance 4 can be a single capacitor, at least two capacitors connected in series, at least two capacitors connected in parallel, or at least three capacitors in a combination of parallel and series connections.

[0097] Please refer to Figure 11 As shown, the second metal pillar 33 is located in the middle of the region between every two feed ports 2. Figure 11 (The location of the first equivalent capacitance 4 in the middle).

[0098] In this embodiment, since the middle position of the region between two adjacent feed ports 2 (the annular radiator 31 between each two feed ports 2) is the point of maximum electric field, the second metal pillar 33 is connected at this position, and the second metal pillar 33 is then connected to the ground plane 1 through the first equivalent capacitor 4, which achieves the best effect in tuning the decoupling frequency of the antenna device.

[0099] Please refer to Figure 13 As shown, after the antenna device of this application is connected to the first equivalent capacitor 4 with different capacitance values, when the current is excited from the second feed port 22 to the first feed port 21, the absolute value of the isolation at different decoupling frequencies is greater than 35dB, which can meet the user's needs.

[0100] In the above embodiments, the annular radiator 31 can be an annular patch antenna.

[0101] Please refer to Figures 1-3As shown, the antenna device also includes a dielectric substrate 5, a ring radiator 31 attached to the dielectric substrate 5, and a first metal pillar 32 passing through the dielectric substrate 5. The dielectric substrate 5 supports the ring radiator 31 and maintains the structural stability of the ring radiator 31. The dielectric substrate 5 can be a flame-retardant material (FR-4) dielectric board, a Rogers dielectric board, or a hybrid dielectric board of Rogers and FR-4, etc. Here, FR-4 is a designation for a flame-retardant material grade, and a Rogers dielectric board is a high-frequency board.

[0102] In the first embodiment described above, please refer to Figure 14 As shown, the side length W1 of the dielectric substrate 5 is 64mm, the radius R4 of the ground plane 1 is 75mm, the thickness H1 of the dielectric substrate 5 is 0.4mm, and the diameter of the first metal pillar 32 is 0.6mm.

[0103] In the second embodiment, please refer to Figures 14-17 As shown, the antenna device includes three feed ports 2, each feed port 2 is connected to a first metal post 32, and the radiator 3 is a circular radiator 34 with a diameter D1 of 0.75λ (λ is the wavelength of the signal to be transmitted). Along the circumference of the circular radiator 34, the ends of each first metal post 32 furthest from the feed port 2 are uniformly connected to the circular radiator 34. Wherein, in Figure 14 , Figure 16 and Figure 17 In the diagram, the first metal pillar 32 and the power supply port 2 are in the same position. For ease of understanding, only the power supply port 2 is shown.

[0104] In this embodiment, the three feed ports 2 of the antenna device are each connected to the circular radiator 34 via a first metal post 32. The positions of any two feed ports 2 are 120° apart along the circumference of the circular radiator 34. Please refer to... Figures 16-17As shown in the test, when the diameter D1 of the radiator 3 is 0.75λ (λ is the wavelength of the signal to be transmitted), a first current path P1 with an electrical length of half a wavelength is equivalently formed in approximately one-third of the region of the circular radiator 34 between each two feed ports 2, and a second current path P2 with an electrical length of one wavelength is equivalently formed in approximately two-thirds of the region of the circular radiator 34 between each two feed ports 2. The excitation current of any feed port 2 can be mathematically decomposed into a pair of common-mode currents and a pair of differential-mode currents. The first current path P1 can transmit a common-mode current of half a wavelength, and the second current path P2 can transmit a differential-mode current of one wavelength. The common-mode current and differential-mode current of any feed port 2 can be equal in amplitude and opposite in phase (cancel each other) in other feed ports 2, so that the current of any feed port 2 will not flow into other feed ports 2, thus decoupling each pair of feed ports 2, thereby improving the radiation performance of the antenna device and the communication quality of the electronic equipment.

[0105] in, Figure 16 and Figure 17 The description will take the first power supply port 21 and the second power supply port 22 as examples, and the contents of other power supply ports 2 will not be repeated here.

[0106] Specifically, please refer to Figure 14 As shown, the diameter D1 of the circular radiator 34 is 81.8 mm. The distance R3 between the first metal post 32 connected to one end of the circular radiator 34 (the position of the feed port 2) and the center O2 of the circular radiator 34 is greater than or equal to 15 mm. The antenna device of this embodiment can transmit 2.4 GHz band signals without mutual coupling.

[0107] Please refer to Figure 18 As shown, the antenna device of this application has an isolation greater than 15dB when transmitting 2.4GHz band signals, which has a good decoupling effect.

[0108] Please refer to Figure 19 As shown, taking the current generated from the second feed port 22 to the first feed port 21 as an example, the isolation between the two feed ports 2 is tested when the distances R3 are 5mm, 10mm, 15mm, 20mm, 30mm and 40mm respectively.

[0109] Tests showed that the decoupling effect between every two power supply ports 2 was optimal when the distance R3 was 25mm.

[0110] Please refer to Figure 15 As shown, the length of the first metal pillar 32 is 2mm, that is, the interval between the circular radiator 34 and the ground 1 is 2mm. Compared with the prior art, the antenna device of this application is thinner and lighter, and the isolation between the three feed ports 2 will not deteriorate.

[0111] As the height of the first metal pillar 32 decreases, the impedance changes. Therefore, a second equivalent capacitor (not shown in the figure) is connected to the end of each first metal pillar 32 away from the circular radiator 34. The second equivalent capacitor is connected to the feed port 2 to perform impedance matching, thereby improving the signal transmission quality.

[0112] The second equivalent capacitor can be a single capacitor, at least two capacitors connected in series, at least two capacitors connected in parallel, or a combination of parallel and series connections of at least three capacitors.

[0113] In the above embodiments, the circular radiator 34 can be a circular patch antenna.

[0114] Please refer to Figures 14-15 As shown, the antenna device also includes a dielectric substrate 5, a circular radiator 34 attached to the dielectric substrate 5, and a first metal pillar 32 passing through the dielectric substrate 5.

[0115] The dielectric substrate 5 can support the circular radiator 34 and maintain the structural stability of the circular radiator 34.

[0116] The dielectric substrate 5 can be a flame-retardant material (FR-4) dielectric board, a Rogers dielectric board, or a hybrid dielectric board of Rogers and FR-4, etc. Here, FR-4 is a designation for a flame-retardant material grade, and the Rogers dielectric board is a high-frequency board.

[0117] In the second embodiment described above, please refer to Figure 14 As shown, the radius of the dielectric substrate 5 is 50 mm, the radius R6 of the ground plane 1 is 75 mm, the thickness H1 of the dielectric substrate 5 is 0.4 mm, and the diameter of the first metal pillar 32 is 0.6 mm.

[0118] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An antenna device, characterized in that, The antenna device includes: a floor and a radiator; The floor includes three power supply ports, and the radiator is connected to the floor through the power supply ports; The radiator includes a connected annular radiator and three first metal pillars. Each feed port is connected to the annular radiator through a corresponding first metal pillar. One-third of the portion of the annular radiator between every two first metal pillars forms a first current path, and two-thirds of the portion of the annular radiator between every two first metal pillars forms a second current path. The electrical length of the first current path is half the electrical length of the second current path. The first current path is used to transmit a half-wavelength common-mode current, and the second current path is used to transmit a one-wavelength differential-mode current.

2. The antenna device according to claim 1, characterized in that, The three feed ports are evenly distributed along the circumference of the annular radiator.

3. The antenna device according to claim 2, characterized in that, The length L1 of each first metal post is 5 mm, and the distance R0 between the end of each first metal post connected to the annular radiator and the center O1 of the annular radiator is 26 mm.

4. The antenna device according to claim 3, characterized in that, The outer radius R1 of the annular radiator is 27 mm, and the inner radius R2 of the annular radiator is 25 mm.

5. The antenna device according to any one of claims 1 to 4, characterized in that, The antenna device further includes a first equivalent capacitor, and the radiator further includes a second metal pillar, which is connected to the floor through the first equivalent capacitor.

6. The antenna device according to claim 5, characterized in that, The second metal pillar is located in the middle of the region between each two of the feed ports.

7. The antenna device according to any one of claims 1 to 5, characterized in that, The antenna device further includes a dielectric substrate, the annular radiator is attached to the dielectric substrate, and the first metal pillar passes through the dielectric substrate.

8. The antenna device according to claim 1, characterized in that, The annular radiator is a circular radiator with a diameter D1 of 0.75λ. Along the circumference of the circular radiator, the end of each of the first metal pillars away from the feed port is uniformly connected to the circular radiator.

9. The antenna device according to claim 8, characterized in that, The diameter D1 of the circular radiator is 81.8 mm, and the distance R3 between the end of the first metal column connected to the circular radiator and the center O2 of the circular radiator is greater than or equal to 15 mm.

10. The antenna device according to claim 9, characterized in that, The distance R3 is 25mm.

11. The antenna device according to any one of claims 8 to 10, characterized in that, The length of the first metal column is 2 mm.

12. The antenna device according to any one of claims 8 to 10, characterized in that, Each of the first metal pillars has a second equivalent capacitor connected to the end furthest from the circular radiator, and the second equivalent capacitor is connected to the feed port.

13. The antenna device according to any one of claims 8 to 10, characterized in that, The antenna device further includes a dielectric substrate, the circular radiator is attached to the dielectric substrate, and the first metal pillar passes through the dielectric substrate.

14. An electronic device, characterized in that, The electronic device includes the antenna device according to any one of claims 1 to 13.

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