Antenna device

Abstract

The embodiment of the invention discloses an antenna device, which comprises a first antenna, a second antenna and a third antenna which are arranged on a substrate, and is characterized in that the first antenna and the second antenna are symmetrically arranged on the substrate along the width direction, and the third antenna is arranged between the first antenna and the second antenna along the width direction of the substrate. A first isolation strip, a second isolation strip and a third isolation strip are arranged between the first antenna and the second antenna, the first isolation strip and the second isolation strip are oppositely arranged, and the third isolation strip is provided with a first isolation section opposite to the first isolation strip and a second isolation section opposite to the second isolation strip. According to the embodiment of the invention, the isolation among multiple antennas can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of wireless communication technology, and in particular, to an antenna device. Background Art

[0002] With the rapid development of the mobile communications industry, antennas, as an important part of the communication system, have a performance that is directly related to the quality of the entire system, so higher requirements are placed on antenna radiation performance. There are many communication protocols that are often used in daily home life, such as LTE, wifi, BLE, ZigBee, etc. In reality, many smart home products require these protocols, such as routers, set-top boxes, smart door locks, etc. These products usually have multiple antennas coexisting inside.

[0003] However, the distance between multiple antennas of current miniaturized electronic devices is relatively small. When the antennas are transmitting and receiving signals at the same time, electromagnetic coupling and interference between multiple antennas are easily caused due to insufficient isolation. If the distance between antennas is increased, the size of the entire device will be too large. Therefore, how to improve the isolation between multiple antennas has become an urgent problem to be solved. Summary of the invention

[0004] An embodiment of the present application provides an antenna device to improve the isolation between multiple antennas.

[0005] In a first aspect, an embodiment of the present application provides an antenna device, comprising a first antenna, a second antenna, and a third antenna arranged on a substrate, wherein the first antenna and the second antenna are symmetrically arranged on the substrate along the width direction, and the third antenna is arranged between the first antenna and the second antenna along the width direction of the substrate, and a first isolation zone, a second isolation zone, and a third isolation zone are arranged between the first antenna and the second antenna, the first isolation zone and the second isolation zone are arranged opposite to each other, and the third isolation zone has a first isolation segment arranged opposite to the first isolation zone and a second isolation segment arranged opposite to the second isolation zone.

[0006] In some possible embodiments, the third isolation zone includes a transverse zone arranged along the width direction of the substrate and a vertical zone extending from the transverse zone to the copper-clad area on the surface of the substrate, and the third isolation zone is divided into left and right parts based on the vertical zone, the left part forms the first isolation segment, and the right part forms the second isolation segment.

[0007] In some possible embodiments, the third antenna includes a main body arranged along the side of the substrate and a feeding terminal and a grounding terminal extending from the main body to the copper-clad area, the transverse band is arranged in a clearance area on the surface of the substrate along the inner side of the substrate, and the vertical band is arranged between the transverse band and the copper-clad area in parallel with the feeding terminal and the grounding terminal.

[0008] In some possible implementations, the first antenna and the third antenna have the same structure, and the third antenna has a different structure from the first antenna and the second antenna; and the length of the first isolation segment is different from the length of the second isolation segment.

[0009] In some possible implementations, the length of the first isolation zone is different from the length of the second isolation zone.

[0010] In some possible implementations, the length of the transverse band is comparable to the width of the substrate.

[0011] In some possible implementations, the first isolation zone and the second isolation zone are respectively provided with a first matching circuit and a second matching circuit.

[0012] In some possible implementations, the first matching circuit and the second matching circuit respectively include at least one inductor or resistor.

[0013] In some possible implementations, the first isolation zone and the second isolation zone are bent structures having at least two sections, and each section of the bent structure is provided with at least one inductor or resistor.

[0014] The beneficial effects of this application are:

[0015] In the embodiment of the present application, the first antenna and the second antenna are symmetrically arranged on the substrate along the width direction, the third antenna is arranged between the first antenna and the second antenna along the width direction of the substrate, and a first isolation zone, a second isolation zone and a third isolation zone are arranged between the first antenna and the second antenna, wherein the first isolation zone and the second isolation zone are arranged opposite to each other, and the third isolation zone has a first isolation segment arranged opposite to the first isolation zone and a second isolation segment arranged opposite to the second isolation zone, thereby achieving the technical effect of improving the isolation between multiple antennas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a schematic diagram of an antenna device provided in an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of the structure of an antenna device provided in an embodiment of the present application;

[0019] Figure 3 It is a parameter diagram of the antenna device provided in an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 100. Substrate;

[0022] 1. Clearance area; 2. Copper-clad area; 4. Second antenna; 5. First antenna; 6. Third antenna; 7. First isolation zone; 8. Second isolation zone; 9. Third isolation zone; 10. First matching circuit; 11. Second matching circuit.

[0023] 4-1, second feeding terminal; 4-2, second grounding terminal; 5-1, first feeding terminal; 5-2, first grounding terminal; 6-1, feeding terminal; 6-2, grounding terminal; 9-1, first isolation section; 9-2, second isolation section;

[0024] L1, the horizontal length of the first isolation zone; L2, the vertical length of the first isolation zone; L3, the horizontal length of the second isolation zone; L4, the vertical length of the second isolation zone; L5, the width of the isolation zone; L6, the distance between the first feeding terminal and the GND end; L7, the distance between the feeding terminals of the first antenna and the second antenna; L8, the distance between the feeding terminals of the first antenna and the third antenna; L9, the distance between the feeding terminals of the second antenna and the third antenna; L10, the vertical band length of the third antenna; L11, the horizontal band length of the third antenna. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail by way of implementation methods with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] It should be noted that: in the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions; in the description of the present application, the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; in the description of the present application, "first", "second", etc. are only used to distinguish each other, rather than to indicate their importance and order, etc.

[0027] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a movable connection, or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal communication of two components, etc. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] An embodiment of the present application provides an antenna device including a first antenna 5, a second antenna 4 and a third antenna 6 arranged on a substrate 100. The first antenna 5 and the second antenna 4 are symmetrically arranged on the substrate 100 along the width direction. The third antenna 6 is arranged between the first antenna 5 and the second antenna 4 along the width direction of the substrate 100. A first isolation zone 7, a second isolation zone 8 and a third isolation zone 9 are arranged between the first antenna 5 and the second antenna 4. The first isolation zone 7 and the second isolation zone 8 are arranged opposite to each other. The third isolation zone 9 has a first isolation segment 9-1 arranged opposite to the first isolation zone 7 and a second isolation segment 9-2 arranged opposite to the second isolation zone 8.

[0029] Exemplarily, the substrate 100 may be a PCBA board, including a clearance area 1 and a copper-clad area 2, the first antenna 5, the second antenna 4 and the third antenna 6 are respectively arranged in the clearance area 1, the first antenna 5 and the second antenna 4 are symmetrically arranged in the clearance area 1 on both sides of the substrate 100 along the width direction, the third antenna 6 is arranged in the clearance area 1 between the first antenna 5 and the second antenna 4, and the three antennas are fed on the same side of the PCBA main board, occupying a small space. Due to the small size of the PCBA, the distance between the three antennas is insufficient, and the first isolation zone 7 and the second isolation zone 8 are relatively arranged to form a cancellation isolation network between the first antenna 5 and the second antenna 4, so that the first isolation zone 7 and the second isolation zone 8 generate a current that cancels each other in the corresponding frequency band, which can improve the isolation between the first antenna 5 and the second antenna 4. The width L5 of the isolation zone is 1mm, and a microstrip line is used. After testing, the isolation between the two is below -15dB. The third isolation zone 9 includes a first isolation segment 9-1 and a second isolation segment 9-2, wherein the first isolation segment 9-1 is arranged opposite to the first isolation zone 7 to form a cancellation isolation network between the first antenna 5 and the third antenna 6, and the second isolation segment 9-2 is arranged opposite to the second isolation zone 8 to form a cancellation isolation network between the second antenna 4 and the third antenna 6. The working principle thereof refers to the first isolation zone 7 and the second isolation zone 8, and will not be elaborated herein.

[0030] The above technical solution improves the isolation between the three antennas and prevents mutual interference between the antennas by disposing the first isolation zone 7, the second isolation zone 8 and the third isolation zone 9 between the first antenna 5, the second antenna 4 and the third antenna 6.

[0031] In some possible implementations, the third isolation zone 9 includes a transverse zone arranged along the width direction of the substrate 100 and a vertical zone extending from the transverse zone to the copper-clad area 2 on the surface of the substrate 100. The third isolation zone 9 is divided into left and right parts based on the vertical zone, the left part forms a first isolation section 9-1, and the right part forms a second isolation section 9-2. This helps to guide the current horizontally from the bottom to both sides, thereby ensuring the isolation between the third antenna 6 and the first antenna 5 and the second antenna 4, and improving the space utilization.

[0032] In some possible implementations, the first isolation segment 9 - 1 and the second isolation segment 9 - 2 partially overlap in the vertical band, further improving space utilization.

[0033] In some possible implementations, the third antenna 6 includes a body arranged along the side of the substrate 100 and a feed terminal 6-1 and a ground terminal 6-2 extending from the body to the copper-clad area, a transverse band is arranged in a clearance area 1 on the surface of the substrate 100 along the inner side of the substrate 100, and a vertical band is arranged parallel to the feed terminal 6-1 and the ground terminal 6-2 between the transverse band and the copper-clad area 2. This makes the distribution of the third isolation band 9 and the layout of the third antenna 6 more compact, saving space.

[0034] In some possible implementations, the first antenna 5 and the second antenna 4 have the same structure, and the third antenna 6 has a different structure from the first antenna 5 and the second antenna 4; the length of the first isolation segment 9-1 is different from the length of the second isolation segment 9-2.

[0035] The first antenna 5 and the second antenna 4 are symmetrically arranged antennas with the same structure, while the structure of the third antenna 6 arranged between the two can be different. Exemplarily, the first feeding terminal 5-1 and the first grounding terminal 5-2 of the first antenna 5 are arranged on one side of the substrate 100 in the height direction, and the second feeding terminal 4-1 and the second grounding terminal 4-2 of the second antenna 4 are arranged in the height direction and symmetrically arranged on the other side with the first antenna 5. The first isolation segment 9-1 and the second isolation segment 9-2 of different lengths introduce different phase differences in different directions, which can respectively generate mutually canceling currents with the first isolation band 7 and the second isolation band 8 in different frequency bands, thereby enhancing the adaptability of the antenna device.

[0036] In some possible implementations, the length of the first isolation zone 7 is different from the length of the second isolation zone 8 , which can further enhance the adaptability of the antenna device and enable it to be applied to different electronic devices.

[0037] In some possible implementations, the transverse band length L11 of the third antenna is equivalent to the width of the substrate 100 , thereby improving the antenna isolation as much as possible while maximizing the space utilization.

[0038] In some possible implementations, a first matching circuit 10 and a second matching circuit 11 are disposed on the first isolation zone 7 and the second isolation zone 8 .

[0039] When the lengths of the first isolation zone 7 and the second isolation zone 8 are not sufficient to generate currents that cancel each other, that is, the horizontal length L1 of the first isolation zone + the vertical length L2 of the first isolation zone < one-quarter wavelength of the design frequency band, and the horizontal length L3 of the second isolation zone + the vertical length L4 of the second isolation zone < one-quarter wavelength of the design frequency band, the first isolation zone 7 and the second isolation zone 8 cannot generate currents that cancel each other in the corresponding frequency band. In this way, the first matching circuit 10 and the second matching circuit 11 can be added to 7 and 8 to generate currents that cancel each other on the line surfaces of the first isolation zone 7 and the second isolation zone 8, so that the antenna can be tuned and has a higher antenna isolation.

[0040] The third antenna 6 is arranged between the first antenna 5 and the second antenna 4. The distance L8 between the feeding terminals of the first antenna and the third antenna is less than one-quarter wavelength of the design frequency, and the distance L9 between the feeding terminals of the second antenna and the third antenna is less than one-quarter wavelength of the design frequency. In this way, the isolation distance between the third antenna 6 and the second antenna 4 and the first antenna 5 is insufficient, causing the third antenna 6 to be excited to generate the same current as the surfaces of the two antennas, and the antenna magnetic fields interfere with each other, so that the antenna isolation is deteriorated and the antenna performance is reduced; therefore, it is necessary to control the length of the first isolation zone 7 and the second isolation zone 8, and by adjusting the first matching circuit 10 and the second matching circuit 11 of the first isolation zone 7 and the second isolation zone 8, the current opposite to the surface of the third antenna 6 is generated by exciting the PCBA copper clad area, thereby improving the isolation between the third antenna 6 and the second antenna 4 and the first antenna 5, and reducing the mutual coupling between the antennas. After testing, the antenna isolation can be below -20db.

[0041] In some possible implementations, the first matching circuit 10 and the second matching circuit 11 include at least one inductor or resistor, and the impedance of the first isolation zone 7 and the second isolation zone 8 can be adjusted by the resistor and the inductor to optimize the performance of the antenna device.

[0042] In some possible implementations, the first isolation zone 7 and the second isolation zone 8 are bent structures having at least two sections, and each section of the bent structure is provided with at least one inductor or resistor.

[0043] By setting inductance or resistance in each section of the bent structure, the characteristic impedance of the transmission line can be adjusted to match the load impedance, reduce the reflection coefficient, improve the transmission efficiency, and compensate for the impedance discontinuity caused by the corners, reducing signal reflection and transmission loss.

[0044] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An antenna device, comprising a first antenna, a second antenna and a third antenna arranged on a substrate, characterized in that: The first antenna and the second antenna are symmetrically arranged on the substrate along the width direction, the third antenna is arranged between the first antenna and the second antenna along the width direction of the substrate, a first isolation zone, a second isolation zone and a third isolation zone are arranged between the first antenna and the second antenna, the first isolation zone and the second isolation zone are arranged opposite to each other, and the third isolation zone has a first isolation segment arranged opposite to the first isolation zone and a second isolation segment arranged opposite to the second isolation zone.

2. The antenna device according to claim 1, characterized in that: The third isolation zone includes a transverse zone arranged along the width direction of the substrate and a vertical zone extending from the transverse zone to the copper-clad area on the surface of the substrate. The third isolation zone is divided into left and right parts based on the vertical zone, the left part forms the first isolation segment, and the right part forms the second isolation segment.

3. The antenna device according to claim 2, characterized in that: The first insulation segment and the second insulation segment overlap in the vertical band portion.

4. The antenna device according to claim 3, characterized in that: The third antenna includes a main body arranged along the side of the substrate and a feeding terminal and a grounding terminal extending from the main body to the copper-clad area, the transverse band is arranged in a clearance area on the surface of the substrate along the inner side of the substrate, and the vertical band is arranged between the transverse band and the copper-clad area in parallel with the feeding terminal and the grounding terminal.

5. The antenna device according to claim 4, characterized in that: The third antenna has a different structure from the first antenna and the second antenna; the length of the first isolation segment is different from the length of the second isolation segment.

6. The antenna device according to claim 5, characterized in that: The length of the first isolation zone is different from the length of the second isolation zone.

7. The antenna device according to claim 3, characterized in that: The length of the transverse strips is comparable to the width of the substrate.

8. The antenna device according to any one of claims 1 to 7, characterized in that: The first isolation zone and the second isolation zone are provided with a first matching circuit and a second matching circuit, respectively.

9. The antenna device according to claim 8, characterized in that: The first matching circuit and the second matching circuit respectively include at least one inductor or resistor.

10. The antenna device according to claim 9, characterized in that: The first isolation zone and the second isolation zone are bent structures with at least two sections, and each section of the bent structure is provided with at least one inductor or resistor.

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