An antenna device

Abstract

The application discloses an antenna device, comprising: a connecting part for connecting with a transmission line of an external device; a grounding part for connecting with the ground of the external device; a first power dividing line connected with the connecting part; a second power dividing line connected with the grounding part; and multiple groups of dipoles; the first power dividing line comprises multiple parallel first connecting branches, and the second power dividing line comprises multiple parallel second connecting branches; each group of the dipoles comprises a first radiation surface and a second radiation surface, the first radiation surface of each group of the dipoles is connected with one of the first connecting branches, and the second radiation surface of each group of the dipoles is connected with one of the second connecting branches, so that the multiple groups of dipoles realize parallel feeding. The antenna device of the application is used for improving the horizontal direction radiation performance of the antenna device without enhancing the transmission power of the antenna device, and enhancing the transmission distance of the antenna device.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more particularly to an antenna device. Background Technology

[0002] Existing routers, drones, and other devices typically transmit signals via WiFi. Therefore, these devices are equipped with antennas to transmit WiFi signals. The WiFi signal strength decreases with distance and is also weakened by obstructions such as walls.

[0003] Existing antenna devices typically use series-fed dipoles, resulting in inconsistent phases among the multiple dipole elements and poor horizontal radiation performance, thus hindering the horizontal transmission of WiFi signals. Current methods to enhance WiFi signals often involve increasing the antenna's transmission power. However, increased transmission power leads to increased radiation exposure to the human body, which may cause harm if a person is exposed to such an antenna for an extended period. Summary of the Invention

[0004] The purpose of this invention is to provide an antenna device that improves the horizontal radiation performance and transmission distance of the antenna device without increasing its transmission power.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An antenna device, comprising:

[0007] The connector is used to connect to the transmission line of an external device;

[0008] Grounding section, used for grounding connection to external equipment;

[0009] A first power distribution line is connected to the connecting part, and the first power distribution line includes multiple parallel first connecting branches;

[0010] The second power distribution line is connected to the grounding part, and the second power distribution line includes multiple parallel second connection branches;

[0011] Multiple sets of dipoles, each set of dipoles including a first radiating surface and a second radiating surface, the first radiating surface of each set of dipoles being connected to a first connecting branch, and the second radiating surface of each set of dipoles being connected to a second connecting branch, so that the multiple sets of dipoles can be fed in parallel.

[0012] Preferably, the first radiating surface includes a plurality of radiating branches, and one end of the longest radiating branch in the first radiating surface is provided with a metal sheet, and the longest radiating branch in the first radiating surface is bent at the metal sheet;

[0013] And / or, the second radiating surface includes a plurality of radiating branches, one end of the longest radiating branch in the second radiating surface is provided with a metal sheet, and the longest radiating branch in the second radiating surface is bent at the metal sheet.

[0014] Preferably, the device further includes a substrate, the substrate having a mounting groove, and at least a portion of the metal sheet being disposed within the mounting groove.

[0015] Preferably, the metal sheet is centered on the substrate in the thickness direction.

[0016] Preferably, a connecting pad is provided at the bend of the longest radiating branch in the first radiating surface and / or at the bend of the longest radiating branch in the second radiating surface, and the metal sheet is welded to the connecting pad.

[0017] Preferably, a pair of connecting pads are provided at the bend of the longest radiating branch in the first radiating surface and / or at the bend of the longest radiating branch in the second radiating surface; the pair of connecting pads are provided on opposite sides of the substrate, and the substrate is provided with metallized vias connecting the pair of connecting pads, and the pair of connecting pads are connected through the metallized vias.

[0018] Preferably, the spacing between two adjacent sets of dipoles is at least three-quarters of the dielectric wavelength.

[0019] Preferably, each set of dipoles has two sets of coupling microstrip lines on one side, and the two sets of coupling microstrip lines are symmetrically distributed along the central axis of the dipole.

[0020] Preferably, the system further includes a substrate, the substrate having opposing first and second surfaces; the first power dividing line and the first radiating surface of the plurality of dipoles are disposed on the first surface; the second power dividing line and the second radiating surface of the plurality of dipoles are disposed on the second surface.

[0021] Preferably, the connecting portion is disposed on the first surface, the grounding portion is disposed on the second surface, the first surface is further provided with a positive grounding pad, the substrate is provided with a metallized through-hole connecting the positive grounding pad and the grounding portion, and the positive grounding pad and the grounding portion are connected through the metallized through-hole.

[0022] Preferably, the substrate is made of FR4 material, and the substrate is fabricated with the first radiating surface and / or the second radiating surface in the form of a printed circuit board.

[0023] Preferably, the first power distribution line and / or the second power distribution line are equal power distribution lines.

[0024] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0025] 1. By feeding multiple sets of dipoles in parallel, it is relatively easy to achieve phase consistency of the radiating surfaces of multiple dipoles, so that the maximum radiating surface of multiple sets of dipoles is located in the horizontal direction, thereby improving the horizontal radiation performance and transmission distance of the antenna device under the same transmission power.

[0026] 2. By using a substrate made of FR4 material and fabricating the first and / or second radiating surfaces in the form of printed circuit boards, the weight of the antenna device is reduced, the manufacturing method is simple, and the radiating surfaces of each dipole can maintain good consistency.

[0027] 3. By providing two sets of coupled microstrip lines on one side of each set of dipoles, the horizontal omnidirectional characteristics of the antenna device are improved, and the antenna device has good gain characteristics. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the antenna device according to an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 Top view of the antenna device;

[0030] Figure 3 This is a partial schematic diagram of the antenna device structure according to an embodiment of the present invention;

[0031] Figure 4 yes Figure 2 A schematic diagram of the other side of the antenna device;

[0032] Figure 5 This is a partial schematic diagram of another part of the structure of the antenna device according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram illustrating the variation of the standing wave ratio (VSWR) of the antenna device according to an embodiment of the present invention within the 2.20–2.60 GHz frequency band;

[0034] Figure 7 This is a schematic diagram illustrating the variation of the standing wave ratio (VSWR) of the antenna device according to an embodiment of the present invention within the 5.00–6.20 GHz frequency band;

[0035] Figure 8 This is the gain pattern of the antenna device according to an embodiment of the present invention at a frequency of 2.45 GHz when phi = 0° and 90°;

[0036] Figure 9 This is the gain pattern of the antenna device according to an embodiment of the present invention at a frequency of 5.8 GHz when phi = 0° and 90°;

[0037] Figure 10 This is the radiation pattern of the antenna device according to an embodiment of the present invention at a frequency of 2.45 GHz with theta = 90°;

[0038] Figure 11 This is the radiation pattern of the antenna device according to an embodiment of the present invention at a frequency of 5.8 GHz with theta = 90°;

[0039] Figure 12 This is a 3D gain diagram of the antenna device according to an embodiment of the present invention at a frequency of 2.45 GHz;

[0040] Figure 13 This is a 3D gain diagram of the antenna device of this embodiment at a frequency of 5.8 GHz.

[0041] Figure 14 This is the radiation pattern of the antenna device according to an embodiment of the present invention at a frequency of theta = 90° at 2.45 GHz after the coupling microstrip line is removed;

[0042] Figure 15 This is the radiation pattern of the antenna device according to an embodiment of the present invention at a frequency of theta = 90° at 5.8 GHz after the coupling microstrip line is removed.

[0043] In the figure: 1. Substrate; 11. First surface; 111. Connecting part; 112. Positive ground pad; 12. Second surface; 121. Grounding part; 13. Mounting groove; 14. Connecting pad; 15. Metallized through-hole; 2. First power divider line; 21. First connecting branch; 3. Second power divider line; 31. Second connecting branch; 4. Dipole; 41. First radiating surface; 411. First radiating stub; 412. Second radiating stub; 42. Second radiating surface; 421. Third radiating stub; 422. Fourth radiating stub; 5. Metal sheet; 6. Coupled microstrip line; 61. Input microstrip line; 62. Output microstrip line. Detailed Implementation

[0044] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0045] The terms used to express position and direction in this invention are illustrated with the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0046] like Figure 1 As shown, the antenna device corresponding to an embodiment of the present invention includes a substrate 1, a dipole 4, a power divider circuit, and a metal sheet 5.

[0047] Further reference Figure 2 and Figure 4 The substrate 1 has a connecting portion 111, a positive ground pad 112, a ground portion 121, and opposing first surfaces 11 and second surfaces 12. The connecting portion 111 and the positive ground pad 112 can be disposed on the first surface 11, and the ground portion 121 can be disposed on the second surface 12. The connecting portion 111 is used for connection to the transmission line of an external device, such as connection to the core wire of an RF connector; the connecting portion 111 can be a rectangular pad. The positive ground pad 112 can be electrically connected to the ground portion 121 through a metallized via 15 disposed on the substrate 1, and the positive ground pad 112 can be used for ground connection to an external device, such as ground connection to an RF connector. The ground portion 121 is used for ground connection to an external device, for example, ground connection to the ground of the RF connector via the positive ground pad 112. The RF connector can be connected to a terminal device to enable connection between the antenna device and the terminal device.

[0048] Furthermore, substrate 1 can be made of FR4 material, such as FR-4 epoxy glass cloth laminate. FR4 is a designation for an existing flame-retardant material grade. FR4 substrate 1 is low-cost, simple to process, lightweight, and easy to install and fix on devices such as routers and drones.

[0049] The dipole 4 can include two frequencies: 2.45 GHz and 5.8 GHz. Multiple sets of dipoles 4 are provided, each set including a first radiating surface 41 and a second radiating surface 42. The first radiating surface 41 and the second radiating surface 42 can be formed on the substrate 1 in the form of a printed circuit board, replacing the existing dipole vibrator made of metal, thus reducing the weight of the antenna device. Furthermore, the fabrication method of the dipole radiating surface is simple, and it can ensure good consistency of the radiating surfaces of each dipole 4.

[0050] Further reference Figure 2Each set of dipoles 4 has its first radiating surface 41 connected to the connecting portion 111. Each set of dipoles 4 has its second radiating surface 42 connected to the grounding portion 121. To reduce the mutual interference between adjacent sets of dipoles 4, the spacing between adjacent sets of dipoles 4 is at least three-quarters of the dielectric wavelength to ensure the horizontal omnidirectionality, bandwidth, and gain of the antenna device. The dielectric wavelength is the distance the antenna travels in one vibration cycle within the medium, which can be air, etc.

[0051] Further reference Figure 3 The first radiating surface 41 includes multiple radiating branches, each with a different length. The length direction of the radiating branches of the first radiating surface 41 is the same as the length direction of the substrate 1. The multiple first radiating surfaces 41 are arranged sequentially at intervals along the length direction of their radiating branches; therefore, the longest radiating branch among the multiple radiating branches of the first radiating surface 41 determines the overall length of the multiple first radiating surfaces 41. Specifically, the first radiating surface 41 may include a first radiating branch 411 and a second radiating branch 412, where the length of the first radiating branch 411 is longer than that of the second radiating branch 412, meaning the first radiating branch 411 is the longest radiating branch among the first radiating surfaces 41. To shorten the overall length of the multiple first radiating surfaces 41 and reduce the size of the antenna device, a metal sheet 5 is provided at one end of the first radiating branch 411, and the first radiating branch 411 can be bent at the metal sheet 5 to reduce its length. The plane where the metal sheet 5 is located is approximately perpendicular to the length direction of the first radial branch 411, and the bent part of the first radial branch 411 is attached to the metal sheet 5.

[0052] Further reference Figure 5 The second radiating surface 42 also includes multiple radiating branches, each with a different length. Specifically, the second radiating surface 42 includes a third radiating branch 421 and a fourth radiating branch 422. The third radiating branch 421 is longer than the fourth radiating branch 422, meaning it is the longest radiating branch in the second radiating surface 422. Therefore, to reduce the size of the antenna device, a metal plate 5 is provided at one end of the third radiating branch 421, and the third radiating branch 421 is bent at the metal plate 5. The plane containing the metal plate 5 is approximately perpendicular to the length direction of the third radiating branch 421, and the bent portion of the third radiating branch 421 is attached to the metal plate 5.

[0053] In a set of dipoles 4, the metal sheet 5 corresponding to the first radiating surface 41 is located at the end of the longest radiating branch of the first radiating surface 41 that is away from the second radiating surface 42; the metal sheet 5 corresponding to the second radiating surface 42 is located at the end of the longest radiating branch of the second radiating surface 42 that is away from the first radiating surface 41. The metal sheet 5 can be a rectangular structure.

[0054] When it is necessary to adjust the frequency of dipole 4, the 2.45 GHz frequency can be adjusted by adjusting the distance of the metal plate 5, or the 5.8 GHz frequency can be adjusted by adjusting the length of the shorter radiating branch in the first radiating surface 41 and / or the second radiating surface 42. By adjusting the frequency of dipole 4, multiple dipoles 4 can be kept in a consistent state, ensuring the consistency of multiple first radiating surfaces 41 and / or multiple second radiating surfaces 42.

[0055] To facilitate the installation of the metal sheet 5, the substrate 1 is provided with a mounting groove 13 and a connecting pad 14. The metal sheet 5 can be embedded in the mounting groove 13 for easy installation. When the metal sheet 5 is embedded in the mounting groove 13, the middle part of the metal sheet 5 is received in the mounting groove 13, and the opposite ends of the metal sheet 5 protrude outward from the substrate 1 along the thickness direction of the substrate 1, and the opposite ends of the metal sheet 5 protruding outward from the substrate 1 along the thickness direction of the substrate 1 have the same length, so that the metal sheet 5 is centered and aligned with the substrate 1 in the thickness direction of the substrate 1.

[0056] Connecting pads 14 are disposed on the side of the metal sheet 5 facing its corresponding radiating branch and are electrically connected to the radiating branch. The connecting pads 14 are used for soldering to the metal sheet 5 to fix the metal sheet 5 to the substrate 1 and achieve electrical connection with the corresponding radiating branch. Preferably, a pair of connecting pads 14 are disposed on the side of the metal sheet 5 facing its corresponding radiating branch. The pair of connecting pads 14 are located on the first surface 11 and the second surface 12, respectively. The projection positions of the pair of connecting pads 14 on the first surface 11 are the same, and the pair of connecting pads 14 are connected through metallized vias 15 disposed on the substrate 1, so that the metal sheet 5 can be soldered to the connecting pads 14 located on the first surface 11 and / or the connecting pads 14 located on the second surface 12.

[0057] The power distribution line includes a first power distribution line 2 and a second power distribution line 3. One end of the first power distribution line 2 is connected to the connecting part 111, and the other end forms multiple parallel first connecting branches 21. Each first connecting branch 21 is connected to a first radiating surface 41, so that the first radiating surface 41 is connected to the connecting part 111 through the first power distribution line 2, and the multiple first radiating surfaces 41 are connected in parallel. The number of first connecting branches 21 is the same as the number of first radiating surfaces 41. One end of the second power distribution line 3 is connected to the grounding part 121, and the other end forms multiple parallel second connecting branches 31. Each second connecting branch 31 is connected to a second radiating surface 42, so that the second radiating surface 42 is connected to the grounding part 121 through the second power distribution line 3, and the multiple second radiating surfaces 42 are connected in parallel. The number of second connecting branches 31 is the same as the number of second radiating surfaces 42. Through the cooperation of the first power distribution line 2 and the second power distribution line 3, multiple dipoles 4 are fed in parallel. Furthermore, in order to further facilitate the phase consistency between the dipole radiating surfaces, the first power dividing line 2 and / or the second power dividing line 3 can be equal power dividing lines.

[0058] Specifically, there can be three first connecting branches 21 and two connecting branches 31, and three corresponding dipoles 4; this makes the power dividing lines form a one-to-three power dividing network, ensuring that the current in each dipole 4 is of equal amplitude and in phase, maintaining the phase consistency between the dipole radiating surfaces. The total length of the antenna device with three sets of dipoles 4 can be 140-160mm, specifically 150mm.

[0059] Because existing antennas with multiple dipoles 4 are fed in series, they cannot achieve phase consistency, and the maximum radiation direction of the multiple dipoles 4 is not in the direction of the water surface, resulting in poor horizontal radiation performance. This invention uses a parallel-fed configuration for the multiple dipoles 4, which makes it easier to achieve phase consistency of the radiating surfaces of the multiple dipoles 4, ensuring that the maximum radiating surface of the multiple dipoles 4 is in the horizontal direction. Therefore, compared with existing antennas, the parallel-fed antenna device of this invention effectively improves the horizontal radiation performance and extends the transmission distance.

[0060] The first radiating surface 41 and the second radiating surface 42 of the dipole 4 have the same shape and are arranged opposite each other, and are symmetrically distributed along an axis, which is the central axis of the dipole 4. Two sets of coupling microstrip lines 6 are also provided on one side of the dipole 4, and both sets of coupling microstrip lines 6 can be disposed on the first surface 11. The two sets of coupling microstrip lines 6 are symmetrically distributed along the central axis of the dipole 4, such that one set of coupling microstrip lines 6 corresponds to the first radiating surface 41 and is located on the first surface 11; the other set of coupling microstrip lines 6 corresponds to the second radiating surface 42, and the two are located on different surfaces. The spacing between the coupling microstrip lines 6 and the first radiating surface 41 or the second radiating surface 42 is preferably 1 mm.

[0061] Further reference Figures 6 to 13 HFSS (High Frequency Structure Simulator) tests on the antenna device of the present invention show that the antenna VSWR is <2.0 in the 2.45GHz and 5.8GHz frequency bands; in the 2.45GHz frequency band, the gain is greater than 5.0dBi and the H-plane out-of-roundness is <2.0dB; in the 5.8GHz frequency band, the gain is greater than 7.5dBi and the H-plane out-of-roundness is <4.0dB. Further reference... Figure 14 and Figure 15 After removing the coupling microstrip line 6, HFSS testing of the antenna device showed that the H-plane out-of-roundness was <2.1dB at 2.4GHz and <8.0dB at 5.8GHz. This demonstrates that placing the coupling microstrip line 6 on one side of each dipole group 4 effectively improves the horizontal omnidirectional characteristics of the antenna device and gives it good gain characteristics.

[0062] Each set of coupled microstrip lines 6 includes an input microstrip line 61 and an output microstrip line 62, preferably 0.8 mm apart. The output microstrip line 62 is located on the side of the input microstrip line 61 facing away from the dipole 4. By adjusting the width of the output microstrip line 62 and / or the spacing between the output microstrip line 62 and the ground portion 121, the impedance matching performance of the antenna device can be adjusted to achieve good impedance matching performance, thereby improving the overall characteristics of the antenna device in the horizontal direction.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. An antenna device, characterized by include: The connecting part (111) is used to connect to the transmission line of an external device; Grounding part (121) is used for grounding connection with external equipment; The first power distribution line (2) is connected to the connecting part (111), and the first power distribution line (2) includes a plurality of parallel first connecting branches (21). The second power distribution line (3) is connected to the grounding part (121), and the second power distribution line (3) includes multiple parallel second connection branches (31). Multiple sets of dipoles (4), each set of dipoles (4) includes a first radiating surface (41) and a second radiating surface (42). The first radiating surface (41) of each set of dipoles (4) is connected to a first connecting branch (21), and the second radiating surface (42) of each set of dipoles (4) is connected to a second connecting branch (31), so that the multiple sets of dipoles (4) can be fed in parallel. The substrate (1) is provided with a mounting groove (13); The first radiating surface (41) includes multiple radiating branches. One end of the longest radiating branch in the first radiating surface (41) is provided with a metal sheet (5), and the longest radiating branch in the first radiating surface (41) is bent at the metal sheet (5). And / or, the second radiating surface (42) includes a plurality of radiating branches, one end of the longest radiating branch in the second radiating surface (42) is provided with a metal sheet (5), and the longest radiating branch in the second radiating surface (42) is bent at the metal sheet (5); At least a portion of the metal sheet (5) is disposed within the mounting groove (13).

2. The antenna device of claim 1, wherein The metal sheet (5) is centered and aligned with the substrate (1) in the thickness direction of the substrate (1).

3. The antenna device of claim 1, wherein A connecting pad (14) is provided at the bend of the longest radiating branch in the first radiating surface (41) and / or at the bend of the longest radiating branch in the second radiating surface (42), and the metal sheet (5) is welded to the connecting pad (14).

4. The antenna device of claim 3, wherein A pair of connection pads (14) are provided at the bend of the longest radiating branch in the first radiating surface (41) and / or at the bend of the longest radiating branch in the second radiating surface (42); the pair of connection pads (14) are provided on opposite sides of the substrate (1), and the substrate (1) is provided with metallized vias (15) connecting the pair of connection pads (14), and the pair of connection pads (14) are connected through the metallized vias (15).

5. The antenna device of claim 1, wherein, The spacing between two adjacent sets of dipoles (4) is at least three-quarters of the medium wavelength.

6. The antenna device of claim 1, wherein, Two sets of coupling microstrip lines (6) are provided on one side of each set of dipoles (4), and the two sets of coupling microstrip lines (6) are symmetrically distributed along the central axis of the dipoles (4).

7. The antenna device of claim 1, wherein, The substrate (1) includes a first surface (11) and a second surface (12) opposite to each other; the first radiation surface (41) of the first power dividing line (2) and the multiple sets of dipoles (4) is disposed on the first surface (11); the second radiation surface (42) of the second power dividing line (3) and the multiple sets of dipoles (4) is disposed on the second surface (12).

8. The antenna device according to claim 7, characterized in that, The connecting portion (111) is disposed on the first surface (11), the grounding portion (121) is disposed on the second surface (12), the first surface (11) is also provided with a positive grounding pad (112), the substrate (1) is provided with a metallized through hole (15) connecting the positive grounding pad (112) and the grounding portion (121), and the positive grounding pad (112) and the grounding portion (121) are connected through the metallized through hole (15).

9. The antenna device according to claim 1 or 7, characterized in that The substrate (1) is made of FR4 material, and the substrate (1) is prepared in the form of a printed circuit board with the first radiating surface (41) and / or the second radiating surface (42).

10. The antenna device of claim 1, wherein, The first power distribution line (2) and / or the second power distribution line (3) are equal power distribution lines.

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