Antenna and network equipment
By integrating WiFi antennas and NFC antennas on the same dielectric board in network devices and connecting them with multi-turn coils and conductive posts, the problem of excessive internal size of the device is solved, miniaturizing the device and reducing interference between antennas.
Patent Information
- Application Number
- CN202521213171.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2035-06-13
AI Technical Summary
In existing network equipment, the independent arrangement of WiFi antennas and NFC antennas increases the internal size of the device, which is not conducive to the development of miniaturization.
Integrate the WiFi antenna and the NFC antenna on the same dielectric board to work in the same aperture plane, and achieve electrical connection through the design of multi-turn coils and the connection of conductive columns, reducing the layout space of the coils on the dielectric board.
It significantly reduces the overall size of the antenna, facilitates the miniaturization of network equipment, and reduces the mutual interference between WiFi antenna and NFC antenna.
Smart Images
Figure CN223156265U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of wireless communication technologies, and particularly to an antenna and a network device. Background Art
[0002] With the development of communication technologies, optical fiber transmission is increasingly applied to communication systems. Among them, fiber to the room (FTTR) is an important part of the optical network. The FTTR system includes a main device and a sub device, and the main device and the sub device are connected by an optical fiber. The main device serves as an optical network terminal (ONT) in a passive optical network (PON) and is connected to an optical line terminal (OLT) at the operator's central office through an optical fiber. The sub device serves as an optical network unit (ONU) in the passive optical network and provides signals for user terminals.
[0003] Network devices such as ONT and ONU have WiFi antennas and are wirelessly connected to user terminals (such as mobile phones) through a WiFi network. The network device may also have a near field communication (NFC) antenna. When a user terminal with NFC function is attached to the network device, the user terminal and the network device can perform point-to-point data transmission. For example, when the user terminal connects to the WiFi network of the network device, the user terminal can be attached to the network device to automatically connect the user terminal to the WiFi network of the network device.
[0004] Deploying multiple independent antennas inside the network device increases the circuit size inside the network device, which is not conducive to the miniaturization development of the network device. Summary of the Utility Model
[0005] The present disclosure provides an antenna and a network device, which can reduce the occupied size of the antenna in the network device and is conducive to the miniaturization development of the network device.
[0006] In a first aspect, the present disclosure provides an antenna, which includes a dielectric board, an NFC antenna, and a WiFi antenna;
[0007] The NFC antenna includes a multi-turn coil. Both the multi-turn coil and the WiFi antenna are located on the surface of the dielectric board, and the WiFi antenna is located in the space surrounded by the multi-turn coil.
[0008] In the solution shown in the present disclosure, the WiFi antenna and the NFC antenna are integrated on a dielectric board, enabling the WiFi antenna and the NFC antenna to operate simultaneously within the same aperture plane. This can significantly reduce the overall size of the antenna, facilitating the miniaturization development of network devices.
[0009] In one implementation, the multi-turn coil includes a first partial coil and a second partial coil that are electrically connected;
[0010] The first partial coil is located on the first surface of the dielectric board, and the second partial coil is located on the second surface of the dielectric board;
[0011] The radiation unit of the WiFi antenna is located on the first surface of the dielectric board and within the space enclosed by the first partial coil.
[0012] In the solution shown in the present disclosure, in the multi-turn coil of the NFC antenna, the first partial coil is arranged on the first surface of the dielectric board, and the second partial coil is arranged on the second surface of the dielectric board. Compared with the case where all the coils are on the same surface of the dielectric board, it is beneficial to reduce the layout space of the coils on the dielectric board, further beneficial to reducing the size of the antenna, and further beneficial to the miniaturization development of the network device where the antenna is located.
[0013] In one implementation, the projection of the second partial coil on the first surface of the dielectric board at least partially coincides with the first partial coil on the first surface of the dielectric board.
[0014] In the solution shown in the present disclosure, the first partial coil and the second partial coil partially coincide in the direction perpendicular to the dielectric board, such as mostly coinciding or even completely coinciding. Compared with the case where the first partial coil and the second partial coil are both arranged on the same surface of the dielectric board, it is beneficial to reduce the layout space of the multi-turn coil of the NFC antenna on the dielectric board, and further beneficial to the miniaturization development of the network device.
[0015] In one implementation, both the first partial coil and the second partial coil include a first end and a second end. The first end of the first partial coil and the first end of the second partial coil are electrically connected through a conductive post penetrating the thickness of the dielectric board;
[0016] The second end of the first partial coil and the second end of the second partial coil are both connected to the NFC radio frequency circuit of the NFC antenna.
[0017] In the solution shown in the present disclosure, the first ends of the first part of the coil and the second part of the coil are relatively positioned in a direction perpendicular to the dielectric plate. In this way, a through hole is provided at a position corresponding to the first end of the first part of the coil on the first surface of the dielectric plate, and a conductive material is deposited at the through hole to form a conductive pillar. One end of the conductive pillar is connected to the first end of the first part of the coil, and the other end of the conductive pillar is connected to the first end of the second part of the coil, thereby realizing electrical connection between the first part of the coil and the second part of the coil. The second ends of the first part of the coil and the second part of the coil are both connected to the NFC radio frequency circuit, thereby feeding power to the NFC antenna.
[0018] In one implementation, the projections of the second end of the first part of the coil and the second end of the second part of the coil on the first surface of the dielectric plate are both located inside the space surrounded by the first part of the coil, or both located outside the space surrounded by the first part of the coil.
[0019] In one implementation, a first pad is provided on the first surface of the dielectric plate at the position of the second end of the first part of the coil, and a second pad is provided on the first surface of the dielectric plate at the projection position of the second end of the second part of the coil;
[0020] The second end of the first part of the coil is connected to the first pad, and the second end of the second part of the coil is connected to the second pad through a conductive pillar penetrating the thickness of the dielectric plate;
[0021] Wherein, the first pad and the second pad are connected to the NFC radio frequency circuit of the NFC antenna. For example, the first pad is used to weld with the inner conductor of the coaxial feeder, and the second pad is used to weld with the outer conductor of the coaxial feeder.
[0022] In the solution shown in the present disclosure, both the first pad and the second end of the first part of the coil are on the first surface of the dielectric plate, and they can be directly connected. The second pad is on the first surface of the dielectric plate, while the second end of the second part of the coil is on the second surface of the dielectric plate. Then, the second pad and the second end of the second part of the coil can be connected through a conductive pillar penetrating the thickness of the dielectric plate. The conductive pillar is a columnar structure formed by the conductive material deposited in the through hole on the dielectric plate.
[0023] In the solution shown in the present disclosure, the projections of the second end of the first part of the coil and the second end of the second part of the coil on the first surface of the dielectric plate are both located inside the space surrounded by the first part of the coil, or both located outside the space surrounded by the first part of the coil, which is beneficial to making the positions of the first pad and the second pad relatively close, facilitating the welding of the inner conductor of the coaxial feeder with the first pad and the welding of the outer conductor of the coaxial feeder with the second pad.
[0024] In one implementation, the WiFi antenna is a dipole antenna. The WiFi antenna includes a first radiation unit, a second radiation unit, and a balun unit. The first radiation unit, the second radiation unit, and the balun unit are all located on the first surface of the dielectric plate, and the balun unit is connected to the ends of the first radiation unit and the second radiation unit that are close to each other.
[0025] On the first surface of the dielectric plate, at the connection between the first radiation unit and the balun unit and at the connection between the second radiation unit and the balun unit, a third pad and a fourth pad are respectively arranged. Among them, the third pad and the fourth pad are connected to the WiFi RF circuit of the WiFi antenna.
[0026] In the solution shown in the present disclosure, the WiFi antenna can be a dipole antenna, specifically a dipole antenna including a balun unit. Among them, the electrical length of the balun unit is 0.25λ, and λ is the center wavelength within the operating frequency band of the WiFi antenna. The WiFi antenna including a dipole antenna is beneficial to improving the impedance matching between the radiation unit and the WiFi RF circuit.
[0027] In one implementation, the WiFi antenna is an inverted-F antenna. The WiFi antenna includes a radiation arm, a shorting arm, and a ground plane. The radiation arm, the shorting arm, and the ground plane are all located on the first surface of the dielectric plate, and the shorting arm is connected to the ground plane.
[0028] On the first surface of the dielectric plate, at the position of the end of the radiation arm close to the ground plane, there is a fifth pad. The end of the radiation arm is connected to the fifth pad. Among them, the fifth pad and the ground plane are both connected to the WiFi RF circuit of the WiFi antenna.
[0029] In one implementation, the WiFi antenna is a patch antenna. The WiFi antenna includes a radiation patch, a ground plane, and a microstrip line. The radiation patch is located on the first surface of the dielectric plate, and the ground plane and the microstrip line are located on the second surface of the dielectric plate.
[0030] On the first surface of the dielectric plate, there are a sixth pad and a seventh pad. The ground plane and the sixth pad are electrically connected through a conductive post penetrating the thickness of the dielectric plate, and the microstrip line and the seventh pad are electrically connected through a conductive post penetrating the thickness of the dielectric plate. Among them, the sixth pad and the seventh pad are both connected to the WiFi RF circuit of the WiFi antenna.
[0031] In the solution shown in the present disclosure, the ground plane and the microstrip line are both located on the second surface of the dielectric substrate, while the sixth pad and the seventh pad are both located on the first surface of the dielectric substrate. Then, the sixth pad is electrically connected to the ground plane through a conductive column penetrating the thickness of the dielectric substrate, and the seventh pad is electrically connected to the microstrip line through a conductive column penetrating the thickness of the dielectric substrate.
[0032] In one implementation, the distance between the edge of the ground plane and the coil on the surface where the ground plane is located is greater than or equal to 3 millimeters.
[0033] In the solution shown in the present disclosure, in order to reduce the mutual interference between the WiFi antenna and the NFC antenna, the distance between the edge of the ground plane and the coil on the surface where it is located is greater than or equal to 3 millimeters. For example, if the ground plane is located on the first surface of the dielectric substrate, the distance between the edge of the ground plane and the coil on the first surface is greater than or equal to 3 millimeters. Another example, if the ground plane is located on the second surface of the dielectric substrate, the distance between the edge of the ground plane and the coil on the second surface is greater than or equal to 3 millimeters.
[0034] In one implementation, the distance between the edge of the radiation unit of the WiFi antenna and the coil on the surface where the radiation unit of the WiFi antenna is located is greater than or equal to 4 millimeters.
[0035] In the solution shown in the present disclosure, in order to reduce the mutual interference between the WiFi antenna and the NFC antenna, the distance between the edge of the radiation unit of the WiFi antenna and the coil on the surface where it is located is greater than or equal to 4 millimeters. For example, if the WiFi antenna is a dipole antenna, the distances between the edges of the first radiation unit and the second radiation unit and the coil on the surface where they are located are both greater than or equal to 4 millimeters. Another example, if the WiFi antenna is an inverted-F antenna, the distances between the edges of the radiation arm and the shorting arm and the coil on the surface where they are located are both greater than or equal to 4 millimeters. Another example, if the WiFi antenna is a patch antenna, the distance between the edge of the radiation patch and the coil on the surface where it is located is greater than or equal to 4 millimeters.
[0036] In a second aspect, the present disclosure further provides a network device, and the network device includes the antenna according to any one of the first aspect. Description of the Drawings
[0037] Figure 1 is a schematic diagram of the system architecture of fiber to the home or fiber to the office provided by an exemplary embodiment of the present disclosure;
[0038] Figure 2 is a schematic diagram of the system architecture of FTTR provided by an exemplary embodiment of the present disclosure;
[0039] Figure 3Schematic diagram of a dipole antenna and an NFC antenna integrated on the same dielectric substrate provided by an exemplary embodiment of the present disclosure;
[0040] Figure 4 Schematic diagram of a dipole antenna and an NFC antenna integrated on the same dielectric substrate provided by another exemplary embodiment of the present disclosure;
[0041] Figure 5 Is for Figure 3 The simulation data obtained by simulating the NFC antenna in;
[0042] Figure 6 Is for Figure 3 The simulation data obtained by simulating the dipole antenna in;
[0043] Figure 7 Schematic diagram of an inverted-F antenna and an NFC antenna integrated on the same dielectric substrate provided by an exemplary embodiment of the present disclosure;
[0044] Figure 8 Is for Figure 7 The simulation data obtained by simulating the NFC antenna in;
[0045] Figure 9 Is for Figure 7 The simulation data obtained by simulating the dipole antenna in;
[0046] Figure 10 Schematic diagram of a patch antenna and an NFC antenna integrated on the same dielectric substrate provided by an exemplary embodiment of the present disclosure;
[0047] Figure 11 Is for Figure 10 The simulation data obtained by simulating the NFC antenna in;
[0048] Figure 12 Is for Figure 10 The simulation data obtained by simulating the dipole antenna in.
[0049] Description of reference numerals
[0050] 1. Dielectric substrate; 11. First pad; 12. Second pad; 13. Third pad; 14. Fourth pad; 15. Fifth pad; 16. Sixth pad; 17. Seventh pad. 21. First part of the coil; 22. Second part of the coil. a. First end; b. Second end. 31. First radiation unit; 32. Second radiation unit; 33. Balun unit; 34. Radiation arm; 35. Shorting arm; 36. Ground plane; 37. Radiation patch; 38. Microstrip line; 361. First slot; 362. Second slot. Detailed implementation manners
[0051] To make the objectives, technical solutions, and advantages of this disclosure more apparent, the following further describes the embodiments of this disclosure in detail with reference to the accompanying drawings.
[0052] Figure 1 It is a schematic diagram of the system architecture for fiber to the home / office (FTTH / O).
[0053] Refer to Figure 1 As shown, the network-side devices (such as switches, routers, etc.) connected upstream are deployed in the central office (CO). Via the optical distribution network (ODN), they are connected to the downstream ONTs, which are deployed in homes or offices. The ODN includes a passive optical splitter for optical power distribution, a backbone optical fiber connected between the passive optical splitter and the OLT, and a branch optical fiber connected between the passive optical splitter and the ONT. When transmitting the downstream signal, the downstream signal sent by the OLT is transmitted to each ONT through the passive optical splitter, and each ONT selectively receives the downstream data belonging to itself in the downstream signal. When transmitting the upstream signal, the upstream signals sent by N ONTs are converged by the passive optical splitter into a single optical signal and transmitted to the OLT.
[0054] Based on FTTH / O, to solve the signal coverage problem in home or office networks, for example, the signal coverage problem of wireless local area network (WLAN), the optical fiber can be further extended into each room, and an optical terminal device for providing WLAN signals can be installed inside the room. This reduces the distance between the user terminal and the access point (AP) and improves the signal quality. This technology is called fiber to the room (FTTR).
[0055] Figure 2 It is a schematic diagram of the system architecture of FTTR. One aspect of the main device in the FTTR network serves as the ONT in the FTTH network and is connected to the OLT through the optical fiber inserted into its passive optical network (PON) interface. On the other hand, it serves as the upstream device of the FTTR slave device to manage the slave device. The slave devices in FTTR can be deployed in each room of the home or office area and have the functions of ONT and AP, and are used to provide signals for user terminals through the wired / wireless user networks interface (UNI).
[0056] Multiple slave devices can be deployed in FTTR. Each slave device is connected to the master device via an optical splitter, and the master device can uniformly manage and configure all slave devices. Among them, the master device can also be called "master gateway", "master optical network terminal (ONT)", or "main FTTR unit (MFU)" or "main fiber unit (MFU)", etc. The slave device can also be called "slave gateway", "slave optical network terminal (ONT)", or "sub FTTR unit (SFU)" or "sub fiber unit (SFU)", etc.
[0057] Network devices such as the above-mentioned ONT and ONU are connected to the user terminal through a WiFi wireless network. Therefore, a WiFi module is integrated in the network device. The WiFi module includes a WiFi radio frequency circuit and a WiFi antenna. Among them, the WiFi antenna can specifically be a dipole antenna, an inverted-F antenna, or a microstrip patch antenna, etc.
[0058] ONT, especially network devices such as ONU, can also have a near field communication (NFC) function, enabling data transmission between the network device and the user terminal with NFC function through the NFC function.
[0059] For example, in an application scenario, when a user terminal with NFC function (such as a mobile phone) is attached to the network device, point-to-point data transmission can be carried out between the network device and the user terminal through the NFC function. The network device can transmit the password of the WiFi network to the user terminal, enabling the user terminal to automatically connect to the WiFi network of the network device without the user manually entering the password.
[0060] Both a WiFi antenna and an NFC antenna for implementing the NFC function need to be arranged in the network device. In one type of network device, its WiFi antenna is an external antenna, independent of the main body part of the network device, and the NFC antenna is arranged inside the main body part, but this type of network device is not aesthetically pleasing. In another type of network device, its WiFi antenna is an internal antenna arranged inside the box of the network device. For this type of network device with an internal antenna, both the NFC antenna and the WiFi antenna need to be arranged inside the box, and the NFC antenna and the WiFi antenna are independent of each other, increasing the size of the network device and being unfavorable for the miniaturization development of the network device.
[0061] Therefore, this embodiment provides an antenna that integrates the WiFi antenna and the NFC antenna on a dielectric board, enabling the WiFi antenna and the NFC antenna to work simultaneously within the same aperture plane, which can significantly reduce the overall size of the antenna and is conducive to the miniaturization development of the network device.
[0062] Among them, the resonance point of the NFC antenna is 13.56 MHz. The WiFi antenna can be a 2.4G antenna with an operating frequency band from 2.4 GHz to 2.5 GHz. The WiFi antenna can also be a 5G antenna with an operating frequency band from 5.1 GHz to 5.9 GHz. The WiFi antenna can also be a dual-band antenna, including a 2.4G antenna and a 5G antenna.
[0063] As Figure 3 shown, it is a schematic structural diagram of the antenna. Figure 3 In (a) of [reference], the component layout on the first surface of the dielectric board 1 is shown. Figure 3 In (b) of [reference], the component layout on the second surface of the dielectric board 1 is shown.
[0064] Referring to Figure 3 shown, the antenna includes a dielectric board 1, an NFC antenna, and a WiFi antenna. Among them, the NFC antenna includes multiple turns of coils. For example, the NFC antenna includes 2 to 4 turns of coils. Continuing to refer to Figure 3 shown, the multiple turns of coils of the NFC antenna and the WiFi antenna are both arranged on the surface of the dielectric board 1, and moreover, the WiFi antenna is specifically located in the space surrounded by the multiple turns of coils.
[0065] The multiple turns of coils of the NFC antenna can be wound in a circular shape or in a rectangular shape. In the attached drawings, it is schematically shown as being wound in a rectangular shape.
[0066] In one example, referring to Figure 3 shown, the multiple turns of coils of the NFC antenna can be formed by copper plating on the surface of the dielectric board 1. In another example, the multiple turns of coils of the NFC antenna can also be formed by winding a wire (such as a copper wire or an aluminum wire) on the surface of the dielectric board 1. In this embodiment, the example of forming the NFC antenna by copper plating on the surface of the dielectric board 1 is used.
[0067] Referring to Figure 3 shown, the WiFi antenna is arranged in the space surrounded by the multiple turns of coils. By controlling the distance between the edge of the radiation unit of the WiFi antenna and the multiple turns of coils, the mutual influence between the WiFi antenna and the NFC antenna is reduced. For example, the distance between the edge of the radiation unit of the WiFi antenna and the coils on the surface where the WiFi antenna is located is greater than or equal to 4 mm.
[0068] In one example, the WiFi antenna is arranged within the space enclosed by the multi-turn coil. To some extent, the WiFi antenna will reduce the inductance of the NFC antenna. Therefore, the inductance of the NFC antenna can be adjusted by the line width and line spacing of the multi-turn coil, etc., so that the inductance of the NFC antenna is in the range of 1.9 microhenries (μH) to 2.4 μH, and the resonance point of the NFC antenna is near 13.56 MHz, so that the NFC antenna meets the performance requirements.
[0069] In one example, the WiFi antenna is arranged within the space enclosed by the multi-turn coil. The coil will also have a certain impact on the radiation pattern of the WiFi antenna. Therefore, the spacing between the WiFi antenna and the coil can be adjusted. For example, the spacing between the edge of the radiation element of the WiFi antenna and the coil on the surface where it is located is greater than or equal to 4 millimeters, and the spacing between the edge of the ground plane of the WiFi antenna and the coil on the surface where it is located is greater than or equal to 3 millimeters. In this way, the radiation pattern of the WiFi antenna can meet the performance requirements. For example, the gain of the radiation pattern of the WiFi antenna at θ = 0° is relatively large, so that there is a strong WiFi signal in front of the network device.
[0070] To further reduce the size of the antenna, continue to refer to Figure 3 As shown, the multi-turn coil of the NFC antenna includes a first part coil 21 and a second part coil 22. Refer to Figure 3 As shown in (a), the first part coil 21 is located on the first surface of the dielectric plate 1. Refer to Figure 3 As shown in (b), the second part coil 22 is located on the second surface of the dielectric plate 1. The WiFi antenna is located on the first surface of the dielectric plate 1. Then, the radiation element of the WiFi antenna is located within the space enclosed by the first part coil 21, that is, the radiation element of the WiFi antenna is located within the innermost coil of the first part coil 21. Among them, in this embodiment, the surface where the WiFi antenna of the dielectric plate 1 is located is denoted as the first surface.
[0071] To further reduce the size of the antenna, the projection of the second part coil 22 on the first surface coincides at least partially with the first part coil 21 on the first surface, and even completely coincides. Compared with the first part coil 21 and the second part coil 22 being located on the same surface of the dielectric plate 1, the layout space of the NFC antenna on the surface of the dielectric plate 1 can be reduced.
[0072] In one example, although the multi-turn coil of the NFC is divided into a first part coil 21 and a second part coil 22, these two part coils are in an electrically connected relationship and are equivalently formed by winding a single wire.
[0073] Refer to Figure 3 As shown in (a), the first part coil 21 has a first end a and a second end b. Refer toFigure 3 As shown in (b) of the figure, the second part of the coil 22 also has a first end a and a second end b. The first end a of the first part of the coil 21 is electrically connected to the first end a of the second part of the coil 22. The second end b of the first part of the coil 21 and the second end b of the second part of the coil 22 are both connected to the NFC radio frequency circuit of the NFC antenna.
[0074] The way that the first end a of the first part of the coil 21 is electrically connected to the first end a of the second part of the coil 22 can be that, at the position where the first end a of the first part of the coil 21 is electrically connected to the first end a of the second part of the coil 22, the dielectric plate 1 opens a through hole penetrating the thickness of the dielectric plate 1, and a conductive object is deposited in the through hole to form a conductive column. For example, depositing metallic copper to form a copper column. Then, the first end a of the first part of the coil 21 and the first end a of the second part of the coil 22 are electrically connected through the copper column penetrating the thickness of the dielectric plate 1.
[0075] The second end b of the first part of the coil 21 and the second end b of the second part of the coil 22 are both connected to the NFC radio frequency circuit of the NFC antenna. For example, on the first surface of the dielectric plate 1, there are a first pad 11 and a second pad 12. The second end b of the first part of the coil 21 is electrically connected to the first pad 11, and the second end b of the second part of the coil 22 is electrically connected to the second pad 12, and the first pad 11 and the second pad 12 are connected to the NFC radio frequency circuit. For example, the first pad 11 is welded to the inner conductor of the coaxial feeder of the NFC radio frequency circuit, and the second pad 12 is welded to the outer conductor of the coaxial feeder.
[0076] The electrical connection method between the second pad 12 located on the first surface of the dielectric plate 1 and the second end b of the second part of the coil 22 located on the second surface of the dielectric plate 1 is that, at the position corresponding to the second end b of the second part of the coil 22, the dielectric plate 1 has a through hole penetrating the thickness, and a conductive object is deposited in the through hole to form a conductive column. For example, depositing copper to form a copper column, so that the second pad 12 and the second end b of the second part of the coil 22 on different surfaces of the dielectric plate 1 are electrically connected through the copper column.
[0077] In one example, continue to refer to Figure 3 As shown, the projection of the second end b of the second part of the coil 22 on the first surface of the dielectric plate 1 and the second end b of the first part of the coil 21 are both located within the space enclosed by the first part of the coil 21. In another example, refer to Figure 4 As shown, the projection of the second end b of the second part of the coil 22 on the first surface of the dielectric plate 1 and the second end b of the first part of the coil 21 are both located outside the space enclosed by the first part of the coil 21.
[0078] The above arrangement is conducive to making the second end b of the first part of the coil 21 adjacent to the second end b of the second part of the coil 22, so that the first pad 11 and the second pad 12 are close in position. It is conducive to electrically connecting the first pad 11 and the second pad 12 to the same coaxial feeder. For example, the first pad 11 is welded to the inner conductor of the coaxial feeder, and the second pad 12 is welded to the outer conductor of the coaxial feeder.
[0079] As for the projection of the second end b of the second part of the coil 22 on the first surface of the dielectric plate 1 and the second end b of the first part of the coil 21, whether they are both located inside the space enclosed by the first part of the coil 21 or both located outside the space enclosed by the first part of the coil 21 can be flexibly selected according to whether the pad layout space inside the space enclosed by the first part of the coil 21 is relatively abundant or the pad layout space outside the enclosed space is relatively abundant in the actual arrangement. This embodiment does not make a limitation on this. In the following introduction of the characteristics of the WiFi antenna, it can be exemplified that the projection of the second end b of the second part of the coil 22 on the first surface of the dielectric plate 1 and the second end b of the first part of the coil 21 are both located inside the space enclosed by the first part of the coil 21.
[0080] The above is the feature introduction of the multi-turn coil of the NFC antenna. Next, the features of the WiFi antenna will be introduced.
[0081] In one example, the WiFi antenna can be a dipole antenna. Refer to Figure 3 As shown, the WiFi antenna is a dipole antenna, including a first radiation unit 31 and a second radiation unit 32. Among them, the radiation unit of the dipole antenna is also called a radiation arm or a radiation element. Continue to refer to Figure 3 As shown, the WiFi antenna further includes a balun unit 33. Among them, the balun unit 33 is also called a balun, which is used to realize the conversion between balanced signals and unbalanced signals. The electrical length of the balun unit 33 is 0.25λ, where λ is the center wavelength within the operating frequency band of the WiFi antenna.
[0082] Refer to Figure 3 As shown in (a) in
[0083] Continue to refer to Figure 3As shown in (a), on the first surface of the dielectric board 1, there is a third pad 13 at the connection of the first radiation unit 31 and the balun unit 33, and a fourth pad 14 at the connection of the second radiation unit 32 and the balun unit 33 on the first surface of the dielectric board 1.
[0084] Among them, the third pad 13 and the fourth pad 14 are connected to the radio frequency circuit of the WiFi antenna of the WiFi antenna.
[0085] For example, the third pad 13 is welded to the inner conductor of the coaxial feeder, and the fourth pad 14 is welded to the outer conductor of the coaxial feeder. Refer to Figure 3 As shown in (a), the fourth pad 14 is located below the second radiation unit 32 to avoid the outer conductor with a larger area of the coaxial feeder covering the second radiation unit 32.
[0086] As described above, if the distance between the edge of the radiation unit of the WiFi antenna and the coil on the surface where it is located meets the requirement of being greater than or equal to 4 mm, then, refer to Figure 3 As shown, the distances between the edges of the first radiation unit 31, the second radiation unit 32, and the balun unit 33 and the innermost turn of the first part of the coil 21 are all greater than or equal to 4 mm. This is beneficial to reducing the mutual interference between the WiFi antenna and the NFC antenna.
[0087] By arranging the dipole antenna with the balun unit 33 inside the coil of the NFC antenna and adjusting parameters such as the distance between the edge of the first radiation unit 31 and the innermost turn of the first part of the coil 21, the distance between the edge of the second radiation unit 32 and the innermost turn of the first part of the coil 21, the distance between the edge of the balun unit 33 and the innermost turn of the first part of the coil 21, the line width and line spacing of the first part of the coil 21 and the second part of the coil 22, etc., both the NFC antenna and the WiFi antenna can meet the performance requirements.
[0088] For example, as Figure 5 shown, it is a schematic diagram of the relationship between the inductance and frequency obtained by simulating the NFC antenna. Refer to Figure 5 As shown, at the resonance point of 13.56 MHz of the NFC antenna, the inductance is 1.94 uh, meeting the performance requirements.
[0089] As Figure 6 shown, it is a cross-sectional view (i.e., H-plane) of Ф = 90° obtained by simulating the 5G WiFi antenna. Refer to Figure 6As shown, the antenna gain at θ = 0° is 4.3 dBi, and the antenna gain at θ = 180° is 3.97 dBi. The antenna gains are both greater than 2 dBi, indicating that in front of the network device, the signal coverage of the WiFi antenna is good. Generally, in the case of no NFC antenna, the gain of the dipole antenna at θ = 0° is generally about 2 dBi. In this solution, the gain at θ = 0° is about 4 dBi, indicating that the NFC antenna also has a performance improvement effect on the dipole antenna.
[0090] In another example, the WiFi antenna can also be an inverted-F antenna. As Figure 7 shown, it is another schematic structural diagram of the antenna. Figure 7 In (a) of Figure 7 shows the element arrangement on the first surface of the dielectric plate 1.
[0091] Referring to Figure 7 as shown in (a) of
[0092] Continuing to refer to Figure 7 as shown in (a) of
[0093] As described above, the spacing between the edge of the radiation unit of the WiFi antenna and the coil on the surface where it is located meets the requirement of being greater than or equal to 4 mm. Then, referring to Figure 7 as shown, the spacing between the edge of the radiation arm 34 and the innermost circle of the first part of the coil 21 is greater than or equal to 4 mm, and the spacing between the edge of the shorting arm 35 and the innermost circle of the first part of the coil 21 is greater than or equal to 4 mm. And the spacing between the ground plane 36 and the innermost circle of the first part of the coil 21 is greater than or equal to 3 mm. This is beneficial to reducing the mutual interference between the WiFi antenna and the NFC antenna.
[0094] The inverted-F antenna is arranged inside the coil of the NFC antenna. By adjusting parameters such as the distances between the edges of the radiation arm 34 and the shorting arm 35 and the innermost loop of the first part of the coil 21 respectively, the distance between the edge of the ground plane 36 and the innermost loop of the first part of the coil 21, the line width and line spacing of the first part of the coil 21 and the second part of the coil 22, etc., both the NFC antenna and the WiFi antenna can meet the performance requirements.
[0095] For example, as Figure 8 shown, it is a schematic diagram of the relationship between the inductance and frequency obtained by simulating the NFC antenna. Referring to Figure 8 shown, at the resonance point of 13.56 MHz of the NFC antenna, the inductance is 1.94 uh, meeting the performance requirements.
[0096] As Figure 9 shown, it is a cross-sectional view (i.e., the H-plane) of Ф = 90° obtained by simulating the 2.4G WiFi antenna. Referring to Figure 9 shown, when θ is 0°, the antenna gain is about 3 dBi, and when θ is 180°, the antenna gain is 3 dBi. The antenna gains are both greater than 2 dBi, indicating that in front of the network device, the signal coverage of the WiFi antenna is good. Generally, in the case of no NFC antenna, the gain of the inverted-F antenna at θ = 0° is generally about 2 dBi, while in this solution, the gain at θ = 0° is about 3 dBi, indicating that the NFC antenna also has a performance improvement effect on the inverted-F antenna.
[0097] In another example, the WiFi antenna can also be a patch antenna, such as a microstrip patch antenna. As Figure 10 shown, it is another schematic diagram of the antenna structure. Figure 10 In (a) of Figure 10 shows the component layout on the first surface of the dielectric board 1.
[0098] Referring to Figure 10 as shown in (a) of Figure 10 the WiFi antenna includes a radiation patch 37, a ground plane 36, and a microstrip line 38. The number of radiation patches 37 can be multiple, and they are arranged in an array on the first surface of the dielectric board 1. Referring to
[0099] Referring to Figure 10As shown in Fig. (a), on the first surface of the dielectric board 1, there are a sixth pad 16 and a seventh pad 17. The ground plane 36 is connected to the sixth pad 16, and the microstrip line 38 is connected to the seventh pad 17. Among them, the sixth pad 16 and the seventh pad 17 are connected to the WiFi RF circuit of the WiFi antenna. For example, the seventh pad 17 is soldered to the inner conductor of the coaxial feeder, and the sixth pad 16 is soldered to the outer conductor of the coaxial feeder.
[0100] In order to electrically connect the sixth pad 16 located on the first surface of the dielectric board 1 to the ground plane 36 located on the second surface of the dielectric board 1, a through hole can be opened at the position of the dielectric board 1 corresponding to the sixth pad 16, and a conductive column is formed by depositing a conductive substance in the through hole. For example, a copper column is formed by depositing metallic copper, and the sixth pad 16 and the ground plane 36 are electrically connected through the copper column.
[0101] Similarly, in order to electrically connect the seventh pad 17 located on the first surface of the dielectric board 1 to the microstrip line 38 located on the second surface of the dielectric board 1, a through hole can be opened at the position of the dielectric board 1 corresponding to the end of the microstrip line 38, and a conductive column is formed by depositing a conductive substance in the through hole. For example, a copper column is formed by depositing metallic copper, then the seventh pad 17 and the microstrip line 38 are electrically connected through the copper column.
[0102] Since the sixth pad 16 and the seventh pad 17 are connected to the same coaxial feeder, where the sixth pad 16 is connected to the outer conductor of the coaxial feeder and the seventh pad 17 is connected to the inner conductor of the coaxial feeder, then the positions of the sixth pad 16 and the seventh pad 17 can be adjacent to facilitate connection to the same coaxial feeder.
[0103] Reference Figure 10 As shown in Fig. (b), the ground plane 36 has a first slot 361 adapted to the microstrip line 38, and the microstrip line 38 can be arranged in the first slot 361. Continuing to refer to Figure 10 As shown in Fig. (b), the ground plane 36 can also have a second slot 362 perpendicular to the microstrip line 38, and the second slot 362 is used to adjust the standing wave between the radiation patch 37 and the ground plane 36.
[0104] As described above, the distance between the edge of the radiation unit of the WiFi antenna and the coil on the surface where it is located meets the requirement of being greater than or equal to 4 mm. Then, referring to Figure 10 As shown, the distance between the edge of each radiation patch 37 and the innermost loop of the first part of the coil 21 is greater than or equal to 4 mm, and the distance between the edge of the ground plane 36 and the innermost loop of the second part of the coil 22 is greater than or equal to 3 mm. This is beneficial to reducing the mutual interference between the WiFi antenna and the NFC antenna.
[0105] The patch antenna is arranged inside the coil of the NFC antenna. By adjusting parameters such as the spacing between the edges of each radiation patch 37 and the innermost loop of the first part of the coil 21, the spacing between the edge of the ground plane 36 and the innermost loop of the second part of the coil 22, the line width and line spacing of the first part of the coil 21 and the second part of the coil 22, both the NFC antenna and the WiFi antenna can meet the performance requirements.
[0106] For example, as Figure 11 shown, it is a schematic diagram of the relationship between inductance and frequency obtained by simulating the NFC antenna. Referring to Figure 11 shown, at the resonance point of 13.56 MHz of the NFC antenna, the inductance is 1.94 uh, meeting the performance requirements.
[0107] As Figure 12 shown, it is a cross-sectional view (i.e., H-plane) of Ф = 90° obtained by simulating the 5G WiFi antenna. Referring to Figure 12 shown, when θ is 270°, the antenna gain is approximately 5.3 dBi, and the antenna gain is greater than or equal to 5 dBi, indicating that in front of the network device, the signal coverage of the WiFi antenna is good. Generally, in the case of no NFC antenna, the gain of the patch antenna at θ = 270° is generally about 5 dBi, while in this solution, the gain at θ = 270° is approximately 5.3 dBi, indicating that the NFC antenna has basically no impact on the performance of the patch antenna.
[0108] In the embodiments of the present disclosure, the WiFi antenna and the NFC antenna are integrated. Specifically, the radiation unit of the WiFi antenna is arranged in the space enclosed by the multi-turn coil of the NFC antenna, enabling the WiFi antenna and the NFC antenna to operate in the same aperture plane. Compared with the case where the WiFi antenna is arranged separately on one dielectric board and the NFC antenna is arranged separately on another dielectric board, this embodiment can reduce the overall size of the antenna, which is beneficial to the miniaturization development of the network device where the antenna is located.
[0109] This embodiment also provides a network device, which is specifically a device with WiFi function and NFC function, and the WiFi antenna is an internal antenna. For example, the network device can be an ONT or an ONU.
[0110] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present disclosure shall be included within the protection scope of the present disclosure.
Claims
1. An antenna, characterized in that, The antenna includes a dielectric substrate (1), an NFC antenna, and a WiFi antenna; The NFC antenna includes a multi-turn coil. The multi-turn coil and the WiFi antenna are both located on the surface of the dielectric substrate (1), and the WiFi antenna is located in the space surrounded by the multi-turn coil.
2. The antenna according to claim 1, wherein The multi-turn coil includes a first partial coil (21) and a second partial coil (22) that are electrically connected; The first partial coil (21) is located on the first surface of the dielectric substrate (1), and the second partial coil (22) is located on the second surface of the dielectric substrate (1); The radiation element of the WiFi antenna is located on the first surface of the dielectric substrate (1) and in the space surrounded by the first partial coil (21).
3. The antenna according to claim 2, wherein The projection of the second partial coil (22) on the first surface of the dielectric substrate (1) at least partially coincides with the first partial coil (21) on the first surface of the dielectric substrate (1).
4. The antenna according to claim 2, characterized in that Both the first partial coil (21) and the second partial coil (22) include a first end and a second end. The first end (a) of the first partial coil (21) and the first end (a) of the second partial coil (22) are electrically connected through a conductive post penetrating the thickness of the dielectric substrate (1); The second end (b) of the first partial coil (21) and the second end (b) of the second partial coil (22) are both connected to the NFC radio frequency circuit of the NFC antenna.
5. The antenna according to claim 4, characterized in that, The projections of the second end (b) of the first partial coil (21) and the second end (b) of the second partial coil (22) on the first surface of the dielectric substrate (1) are both located inside the space surrounded by the first partial coil (21), or both located outside the space surrounded by the first partial coil (21).
6. The antenna according to claim 5, wherein On the first surface of the dielectric substrate (1), a first pad (11) is provided at the position of the second end (b) of the first partial coil (21), and a second pad (12) is provided at the projection position of the second end (b) of the second partial coil (22); The second end (b) of the first partial coil (21) is electrically connected to the first pad (11), and the second end (b) of the second partial coil (22) is electrically connected to the second pad (12) through a conductive post penetrating the thickness of the dielectric substrate (1); Wherein, the first pad (11) and the second pad (12) are connected to the NFC radio frequency circuit of the NFC antenna.
7. The antenna according to claim 1, wherein The WiFi antenna is a dipole antenna. The WiFi antenna includes a first radiation element (31), a second radiation element (32), and a balun element (33). The first radiation element (31), the second radiation element (32), and the balun element (33) are all located on the first surface of the dielectric substrate (1), and the balun element (33) is connected to the ends of the first radiation element (31) and the second radiation element (32) that are close to each other; On the first surface of the dielectric plate (1), a third pad (13) and a fourth pad (14) are respectively arranged at the connection between the first radiation unit (31) and the balun unit (33) and at the connection between the second radiation unit (32) and the balun unit (33), wherein the third pad (13) and the fourth pad (14) are connected to the WiFi radio frequency circuit of the WiFi antenna.
8. The antenna according to claim 1, characterized in that, The WiFi antenna is an inverted-F antenna, and the WiFi antenna includes a radiation arm (34), a shorting arm (35) and a ground plane (36). The radiation arm (34), the shorting arm (35) and the ground plane (36) are all located on the first surface of the dielectric plate (1), and the shorting arm (35) is connected to the ground plane (36). On the first surface of the dielectric plate (1), a fifth pad (15) is provided at the end position of the radiation arm (34) close to the ground plane (36), and the end of the radiation arm (34) is connected to the fifth pad (15), wherein the fifth pad (15) and the ground plane (36) are both connected to the WiFi radio frequency circuit of the WiFi antenna.
9. The antenna according to claim 1, wherein The WiFi antenna is a patch antenna, and the WiFi antenna includes a radiation patch (37), a ground plane (36) and a microstrip line (38). The radiation patch (37) is located on the first surface of the dielectric plate (1), and the ground plane (36) and the microstrip line (38) are both located on the second surface of the dielectric plate (1). On the first surface of the dielectric plate (1), a sixth pad (16) and a seventh pad (17) are provided. The ground plane (36) and the sixth pad (16) are electrically connected through a conductive post penetrating the thickness of the dielectric plate (1), and the microstrip line (38) and the seventh pad (17) are electrically connected through a conductive post penetrating the thickness of the dielectric plate (1), wherein the sixth pad (16) and the seventh pad (17) are both connected to the WiFi radio frequency circuit of the WiFi antenna.
10. A network device, characterized in that, The network device includes the antenna according to any one of claims 1 to 9.