CN115566430A - Broadband Sub-6GHz antenna - Google Patents

Abstract

The invention provides a broadband Sub-6GHz antenna, which comprises a substrate, a floor, an F-shaped first radiation assembly, an inverted L-shaped second radiation assembly and a feed strip, wherein the substrate is arranged on the floor; the base plate is positioned above the floor and connected with the floor; the first radiation assembly and the second radiation assembly are respectively positioned on two sides of the substrate; the feed strip is electrically connected with the second radiation component; the first radiation assembly is electrically connected with the floor; the first radiation assembly and the second radiation assembly are overlapped and electrically connected through the through hole, the bandwidth of the Sub-6GHz antenna can be effectively increased by designing the radiation structures of the antenna on two sides, more space is not occupied, the better grounding effect of the antenna can be realized, and the radiation efficiency of the antenna is further improved.

Description

Broadband Sub-6GHz antenna

Technical Field

The invention relates to the field of wireless communication, in particular to a Sub-6GHz antenna for improving the bandwidth of the antenna by designing antenna routing on two sides of a dielectric plate.

Background

Coupling: when more than two radiating elements are arranged in free space, one radiating element is influenced by the electromagnetic action generated by the current of the other radiating element in addition to the electromagnetic action generated by the current of the radiating element, and especially when the radiating elements are close to each other, complex interaction is generated between the radiating elements, and the interaction is called mutual coupling.

Sub-6GHz: the fifth generation mobile communication is mainly divided into two major parts, millimeter wave and Sub-6 GHz. The Sub-6GHz refers to a frequency point of 5G below 6GHz, and mainly comprises N1, N28, N41, N77, N78 and N79 frequency bands according to the planning of Ministry of industry and communications in China. However, the requirement of the Ministry of industry and telecommunication on the network access of the 5G terminal is to support N77 and N78 frequency bands, and other frequency bands are not forcibly popularized for a while, but with the continuous development of 5G base station construction, the 5G terminal in the future must support all the frequency bands, which is a great trend of communication technology development and a great trend of 5G development in China.

However, with the rapid development of the wireless communication industry, especially the popularization of the 5G multiband, several antennas may be needed for the support of the 5G multiband, and at this time, more antennas need to be integrated in the limited internal space of the mobile terminal, so the terminal antenna manufacturer needs to improve the structure of the antenna and reduce the occupancy rate of the antenna to the space. At present, how to integrate multiband antennas and reduce the size of antennas become important research directions for terminal manufacturers. The existing technical scheme is that antenna design is carried out through a dielectric plate on the same side, and due to the limitation of size, the bandwidth of the antenna is limited, so that wide bandwidth radiation is difficult to realize.

In view of this, it is urgently needed to design a novel broadband Sub-6GHz antenna with double-sided routing of a dielectric plate, so as to meet the requirements of the size and bandwidth of the current antenna.

Disclosure of Invention

The invention aims to provide a broadband Sub-6GHz antenna, which solves the problems that the Sub-6GHz antenna usually occupies a large space through single-sided routing and cannot realize better bandwidth and radiation efficiency at the same time.

In order to solve the above problems, the present invention provides a broadband Sub-6GHz antenna, comprising a substrate, a floor, a first radiation component, a second radiation component and a feed strip; the base plate is positioned above the floor and connected with the floor; the first radiation assembly and the second radiation assembly are respectively positioned on two sides of the substrate; the feed strip is electrically connected with the second radiation component; the first radiation assembly is electrically connected with the floor.

Optionally, in the broadband Sub-6GHz antenna, the first radiation element is F-shaped and includes a first radiation branch, a second radiation branch, and a third radiation branch; and the first radiation branch and the second radiation branch are vertically connected with the third radiation branch.

Optionally, in the broadband Sub-6GHz antenna, a discrete element is further disposed between the first radiation branch and the second radiation branch.

Optionally, in the broadband Sub-6GHz antenna, the discrete element is a capacitor with a capacitance value of 0.5 to 3 pF.

Optionally, in the broadband Sub-6GHz antenna, a distance between the first radiation branch and the second radiation branch is 0.6 ± 0.2mm.

Optionally, in the broadband Sub-6GHz antenna, a capacitance value of the discrete element is proportional to a distance between the first radiation branch and the second radiation branch.

Optionally, in the broadband Sub-6GHz antenna, the length of the first radiation branch is greater than the length of the second radiation branch.

Optionally, in the broadband Sub-6GHz antenna, the length of the first radiation branch is 14.8 ± 1.48mm, the length of the second radiation branch is 8.2 ± 0.82mm, and the length of the third radiation branch is 6.4 ± 0.64mm.

Optionally, in the broadband Sub-6GHz antenna, the widths of the first radiation branch, the second radiation branch, and the third radiation branch are equal to each other and are 1.4 ± 0.14mm.

Optionally, in the broadband Sub-6GHz antenna, the second radiation element is in an inverted "L" shape, and includes a fourth radiation branch and a fifth radiation branch; and the fourth radiation branch is vertically connected with the fifth radiation branch.

Optionally, in the broadband Sub-6GHz antenna, the length of the fourth radiation branch is 4 ± 0.4mm, and the width is 1.4 ± 0.14mm.

Optionally, in the broadband Sub-6GHz antenna, the length of the fifth radiation branch is 6.4 ± 0.64mm, and the width of the fifth radiation branch is 1.4 ± 0.14mm

Optionally, in the broadband Sub-6GHz antenna, the fourth radiation branch and the first radiation branch have mutually overlapped routing lines.

Optionally, in the broadband Sub-6GHz antenna, the antenna further includes a matching unit, and the matching unit is electrically connected between the feed strip and the second radiation component.

Optionally, in the broadband Sub-6GHz antenna, the matching unit includes one or more of a capacitor, an inductor, and a resistor.

Optionally, in the broadband Sub-6GHz antenna, a through hole is further disposed on the substrate, and the first radiation assembly and the second radiation assembly are electrically connected through the through hole.

The invention has the beneficial effects that:

providing a Sub-6GHz antenna comprising a substrate, a floor, a first radiating component in an 'F' shape, a second radiating component in an inverted 'L' shape and a feed strip; the first radiation assembly and the second radiation assembly are respectively positioned on two sides of the substrate; the feed strip is electrically connected with the second radiation component; the first radiation assembly is electrically connected with the floor; the first radiation assembly and the second radiation assembly are provided with overlapped parts and are electrically connected through the through holes, the bandwidth of the Sub-6GHz antenna can be effectively increased by designing the radiation structure of the antenna on two sides, more space is not occupied, the better grounding effect of the antenna can be realized, and the radiation efficiency of the antenna is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a structural diagram of a broadband Sub-6GHz antenna provided in this embodiment;

fig. 2 is a structural diagram of a first radiation element of a broadband Sub-6GHz antenna provided in this embodiment;

fig. 3 is a structural diagram of a second radiation element of a broadband Sub-6GHz antenna provided in this embodiment;

FIG. 4 is a comparison diagram of S parameter simulation of a broadband Sub-6GHz antenna provided in this embodiment;

FIG. 5 is a simulation diagram of the efficiency of the broadband Sub-6GHz antenna provided in this embodiment;

FIG. 6 is a simulation diagram of the surface current distribution of a broadband Sub-6GHz antenna provided by this embodiment;

fig. 7 is a simulation diagram of the direction of a broadband Sub-6GHz antenna provided in this embodiment;

wherein the reference numerals are as follows:

1-a substrate; 2-floor board; 3-a first radiating element; 4-a second radiating element; 5-a feed strip; 11-a through hole; 31-a first radiation branch; 32-a second radiation branch; 33-third radiation branch; 34-discrete elements; 41-fourth radiation branch; 42-fifth radiation branch.

Detailed Description

The following describes a broadband Sub-6GHz antenna and a terminal according to the present invention in further detail with reference to the accompanying drawings, tables and specific embodiments. It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, and it is to be understood that such structures as are used are interchangeable where appropriate. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In conventional antenna designs, all branches of the antenna are arranged on one side of a dielectric plate, and then power is supplied through cable lines or power feeding points. The design has the advantages that the antenna is easier to design more wiring ways, and the antenna is easier to debug and test. However, when the antenna design needs to support more frequency bands and needs higher bandwidth, the single-sided arrangement of the antenna on the dielectric plate needs to design more feed branches, and at this time, the wiring mode of the antenna is relatively difficult and the occupied space is larger; furthermore, the antenna wiring of the single-sided design is often difficult to debug and test, and it is difficult to design a higher antenna bandwidth, and the antenna is often more easily interfered by other components.

In order to solve the above-mentioned difficulties, the present invention provides a Sub-6GHz antenna including a substrate, a floor, a first radiation member, a second radiation member, and a feed strip; the first radiation assembly and the second radiation assembly are respectively positioned on two sides of the substrate; the feed strip is electrically connected with the second radiation component; the first radiation assembly is electrically connected with the floor; the first radiation assembly and the second radiation assembly are provided with overlapped parts and are electrically connected through the through holes, the bandwidth of the Sub-6GHz antenna can be effectively increased by designing the radiation structure of the antenna on two sides, more space is not occupied, the better grounding effect of the antenna can be realized, and the radiation efficiency of the antenna is further improved.

Referring to fig. 1, fig. 1 is a structural diagram of a broadband Sub-6GHz antenna provided in this embodiment, and the invention provides a broadband Sub-6GHz antenna, including the substrate 1, the floor 2, the first radiation element 3 in an "F" shape, the second radiation element 4 in an inverted "L" shape, and the feed strip 5; the base plate 1 is positioned above the floor 2 and connected with the floor 2; the first radiation element 3 and the second radiation element 4 are respectively positioned on two sides of the substrate 1; the feed strip 5 is electrically connected with the second radiation element 4; the first radiation assembly 3 is electrically connected with the floor 2; the broadband Sub-6GHz antenna further comprises a matching unit (not shown in the figure) electrically connected between the feed strip 5 and the second radiating element 4; the matching unit is one or more of a capacitor, an inductor and a resistor.

Referring to fig. 2, fig. 2 is a structural diagram of a first radiation element of a broadband Sub-6GHz antenna provided in this embodiment, where the first radiation element 3 is in an "F" shape, and includes a first radiation branch 31, a second radiation branch 32, and a third radiation branch 33; the first radiation branch 31 and the second radiation branch 32 are both vertically connected with the third radiation branch 33; the third radiation branch 33 is electrically connected with the floor 2; the length of the first radiating branch 31 is longer than that of the second radiating branch 32; the discrete element 34 is further disposed between the first radiating branch 31 and the second radiating branch 32.

Referring to fig. 3, fig. 3 is a structural diagram of a second radiation element of the broadband Sub-6GHz antenna provided in this embodiment, where the second radiation element is in an inverted "L" shape and includes a third radiation branch 41 and a fourth radiation branch 42; the fourth radiation branch 41 is vertically connected with the fifth radiation branch 42; the length of the fifth radiation branch 41 is longer than that of the fourth radiation branch 42; the fifth radiation branch 42 is electrically connected with the feed strip 5; the matching element is located between the fifth radiating branch 42 and the feed strip 5.

In this embodiment, the substrate 1 is an FR4 dielectric board with a dielectric constant of 4.3, the thickness is 0.8mm, the width is 8 ± 0.8mm, the length of the first radiation branch 31 is 14.8 ± 1.4mm, the width is 1.4 ± 0.14mm, the length of the second radiation branch 32 is 8.2 ± 0.82mm, the width is 1.4 ± 0.14mm, the length of the third radiation branch 33 is 6.4 ± 0.64mm, and the width is 1.4 ± 0.14mm; the length of the fourth radiation branch 41 is 4 +/-0.4 mm, the width of the fourth radiation branch is 1.4 +/-0.14 mm, the length of the fifth radiation branch 42 is 6.4 +/-0.64 mm, and the width of the fifth radiation branch is 1.4 +/-0.14 mm. It can be seen that the overall dimensions of the first radiation assembly 3 and the second radiation assembly 4 are well controlled by routing on both sides of the substrate 1, that is, the antenna provided by the invention occupies less space, and is convenient for the terminal to arrange more other devices.

The first radiation element 3 and the second radiation element 4 have mutually overlapped parts, the substrate 1 is further provided with the through hole 11, the first radiation element 3 and the second radiation element 4 are electrically connected through the through hole 11, and at this time, when the feed strip 5 feeds power, a coupling effect is generated between the first radiation element 3 and the second radiation element 4. Please refer to fig. 6 and 6, which are surface current distribution simulation diagrams of broadband Sub-6GHz antennas at 3.1GHz, 3.5GHz and 3.9GHz frequency points provided by this embodiment, it can be seen from the diagrams that the first radiation component 3 and the second radiation component 4 on both sides of the substrate 1 achieve better current distribution, the radiation structure of the antenna at the 3.1GHz low frequency band is mainly radiated by long branches, the current distribution at the 3.5GHz frequency point is most concentrated between the horizontal long and short branches, wherein a 1.5pF capacitor plays a key role in ensuring the current distribution, and the current distribution of the high frequency resonance point at 3.9GHz is mainly concentrated on the horizontal short branches, so that the current distribution and radiation of the broadband antenna are achieved by the above antenna routing manner, thereby achieving better resonance bandwidth.

In this embodiment, the distance between the first radiation branch 31 and the second radiation branch 32 is 0.6mm, the discrete element 34 is welded between the first radiation branch 31 and the second radiation branch 32, and the discrete element 34 is a capacitor with a capacitance value of 1.5 pF; by adding the discrete elements 34 for reloading, the bandwidth of the antenna can be increased significantly.

It should be noted that the capacitance value of the discrete element 34 is proportional to the distance between the first radiation branch 31 and the second radiation branch 32, that is, the larger the distance between the first radiation branch 31 and the second radiation branch 32 is, the larger the discrete element 34 with a larger capacitance value is required to be loaded, so as to achieve the effect of increasing the antenna bandwidth. Therefore, in other embodiments, the distances between the first radiating branch 31 and the second radiating branch 32 can be designed to match the loading of the discrete element 34 with a proper capacitance value, so as to match the space inside some terminals.

In this embodiment, the matching unit is connected in series between the feed strip 5 and the second radiation element 4, and the matching unit is a capacitor with a capacitance value of 2pF, please refer to fig. 4, fig. 4 is a simulation comparison diagram of S parameters before and after the broadband Sub-6GHz antenna provided by this embodiment is added to the matching unit, as can be seen from the diagram, the impedance band bandwidth after matching is wider, and the-6 dB bandwidth reaches about 1GHz at 2.9-3.9GHz, and from the simulation of reflection coefficient, it can be obviously seen that there are two more obvious resonance frequency points in the band. It can thus be seen that adding the matching units for series matching does increase the reflection coefficient bandwidth of the antenna.

With reference to fig. 5, fig. 5 is a simulation diagram of the efficiency of the broadband Sub-6GHz antenna provided in this embodiment, and it can be seen from the diagram that the total efficiency of the antenna in the band is above 50%, which is a better efficiency performance for the terminal antenna, and it also indicates that the antenna realizes very good radiation efficiency as a whole by coupling through the above special two-sided structure design, adding the discrete element 34 between the antenna branches of the first radiation element 3, and adding the matching unit between the feed strip 5 and the second radiation element 4.

In addition, the first radiation element 3 and the second radiation element 4 both include radiation branches connected vertically, the first radiation branch 31 and the second radiation branch 32 are both connected vertically to the third radiation branch 33, and the fourth radiation branch 41 is connected vertically to the fifth radiation branch 42. Referring to fig. 7, fig. 7 is a simulation diagram of directions of the broadband Sub-6GHz antenna at frequency points of 3.1GHz, 3.5GHz and 3.9GHz according to this embodiment, and it can be seen from the diagram that simulation results of the antenna at three frequency points all show better omni-directionality, which is an excellent pattern shape of the terminal antenna, and is helpful for receiving signals in various directions caused by multipath reflection.

In summary, the present invention provides a broadband Sub-6GHz antenna, which includes a substrate, a floor, a first F-shaped radiating element, a second L-shaped radiating element, and a feed strip; the base plate is positioned above the floor and connected with the floor; the first radiation assembly and the second radiation assembly are respectively positioned on two sides of the substrate; the feed strip is electrically connected with the second radiation component; the first radiation assembly is electrically connected with the floor; the antenna further comprises a matching unit and a through hole, wherein the matching unit is electrically connected between the feed strip and the second radiation component; the first radiation assembly and the second radiation assembly are overlapped and electrically connected through the through hole, the bandwidth of the Sub-6GHz antenna can be effectively increased by designing the radiation structures of the antenna on two sides, more space is not occupied, the better grounding effect of the antenna can be realized, and the radiation efficiency of the antenna is further improved.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, similar parts between the embodiments may be referred to each other, and different parts between the embodiments may also be used in combination with each other, which is not limited by the present invention.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (16)

1. A broadband Sub-6GHz antenna is characterized by comprising a substrate, a floor, a first radiation component, a second radiation component and a feed strip; the base plate is positioned above the floor and connected with the floor; the first radiation assembly and the second radiation assembly are respectively positioned on two sides of the substrate; the feed strip is electrically connected with the second radiation component; the first radiation assembly is electrically connected with the floor.

2. The broadband Sub-6GHz antenna of claim 1, wherein the first radiating element is "F" shaped and comprises a first radiating branch, a second radiating branch, and a third radiating branch; and the first radiation branch knot and the second radiation branch knot are vertically connected with the third radiation branch knot.

3. A broadband Sub-6GHz antenna according to claim 2, wherein a discrete element is further disposed between the first radiating branch and the second radiating branch.

4. A broadband Sub-6GHz antenna according to claim 3, wherein the discrete elements are capacitors having a capacitance of 0.5 to 3 pF.

5. A broadband Sub-6GHz antenna according to claim 2, wherein the distance between the first radiating stub and the second radiating stub is 0.6 ± 0.2mm.

6. A broadband Sub-6GHz antenna according to claim 3, wherein a capacitance of the discrete element is proportional to a distance between the first radiating branch and the second radiating branch.

7. A broadband Sub-6GHz antenna according to claim 2, wherein the length of the first radiating branch is greater than the length of the second radiating branch.

8. A broadband Sub-6GHz antenna according to claim 2, wherein the first radiating branch has a length of 14.8 + 1.48mm, the second radiating branch has a length of 8.2 + 0.82mm, and the third radiating branch has a length of 6.4 + 0.64mm.

9. A broadband Sub-6GHz antenna according to claim 2, wherein the widths of the first, second and third radiating branches are equal and are 1.4 ± 0.14mm.

10. The broadband Sub-6GHz antenna of claim 2, wherein the second radiating element is in the shape of an inverted "L" comprising a fourth radiating branch and a fifth radiating branch; and the fourth radiation branch is vertically connected with the fifth radiation branch.

11. A broadband Sub-6GHz antenna according to claim 10, wherein the fourth radiating branch has a length of 4 + 0.4mm and a width of 1.4 + 0.14mm.

12. A broadband Sub-6GHz antenna according to claim 10, wherein the fifth radiating branch has a length of 6.4 ± 0.64mm and a width of 1.4 ± 0.14mm.

13. The broadband Sub-6GHz antenna of claim 10, wherein the fourth radiating branch and the trace of the first radiating branch overlap each other.

14. A broadband Sub-6GHz antenna according to claim 1, further comprising a matching element electrically connected between the feed strip and the second radiating element.

15. A broadband Sub-6GHz antenna according to claim 14, wherein the matching unit comprises one or more of a capacitor, an inductor and a resistor.

16. The broadband Sub-6GHz antenna according to claim 1, wherein the substrate is further provided with a through hole, and the first radiation element and the second radiation element are electrically connected through the through hole.

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