Dual frequency antenna and communication device

Abstract

The application provides a dual-frequency antenna and a communication device, the dual-frequency antenna comprising: a feeding unit, a circuit board, and a first radiating unit, a second radiating unit, a third radiating unit and a transmission line arranged on a first surface of the circuit board; the first radiating unit, the second radiating unit and the third radiating unit are arranged in sequence along a first direction on the first surface and are connected in series through the transmission line, the first radiating unit is further connected with the feeding unit through the transmission line, and the feeding unit is used for transmitting or receiving signals through the transmission line. The first radiating unit comprises: a first high-frequency oscillator and a first low-frequency oscillator connected in parallel; the second radiating unit comprises: a second high-frequency oscillator; the third radiating unit comprises: a third high-frequency oscillator and a second low-frequency oscillator connected in parallel; the working frequency bands of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator are a first frequency band, and the working frequency bands of the first low-frequency oscillator and the second low-frequency oscillator are a second frequency band.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of communication technology, and in particular to a dual-frequency antenna and a communication device. BACKGROUND

[0002] Compared with mobile networks, Wireless Fidelity (Wi-Fi) technology is born with a low-cost advantage as it uses unlicensed wireless spectrum. With the improvement of signal rate of Wi-Fi and its popularity, the number of applications of Wi-Fi devices is growing.

[0003] With the increasing demand for signal rate of Wi-Fi, the transmission rate of the 2.4G frequency band of the antenna has been unable to meet the market demand. Therefore, the dual-frequency antenna combining the 2.4G frequency band and the 5G frequency band is promoted. The dual-frequency antenna includes a low-frequency vibrator for transmitting 2.4G signals and a high-frequency vibrator for transmitting 5G signals.

[0004] Under the premise of keeping the size of the whole machine unchanged, how to control the number of antennas becomes more and more important, such as Figure 1 The dual-frequency dual-feed antenna shown in FIG. 1 has a high-frequency vibrator 30 and a low-frequency vibrator 20 located on the front and back surfaces of a circuit board 10, respectively, in a back-to-back layout. Both of them are series-fed array antennas, and the radiation units are connected by coaxial cables to achieve high gain and horizontal coverage. The feed port has two, and each is independent. However, the cables need to be welded on the circuit board, and the welding points are many and dense, which is easy to short circuit, and the process is complex and the cost is high. SUMMARY

[0005] Embodiments of the present application provide a dual-frequency antenna and a communication device, which solve the problems of many welding points, easy short circuit, complex process and high cost of the dual-frequency dual-feed antenna.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] In a first aspect, a dual-frequency antenna is provided, comprising: a circuit board, a first radiating unit, a second radiating unit, a third radiating unit, a transmission line, and a feeding unit; the circuit board comprises a first surface and a second surface facing away from each other; the first radiating unit, the second radiating unit, and the third radiating unit are arranged in sequence along a first direction on the first surface; the first radiating unit, the second radiating unit, and the third radiating unit are connected in series through the transmission line; the first radiating unit is further connected to the feeding unit through the transmission line; the feeding unit is configured to transmit or receive signals through the transmission line; wherein the first radiating unit comprises: a first high-frequency oscillator and a first low-frequency oscillator connected in parallel; the second radiating unit comprises: a second high-frequency oscillator; the third radiating unit comprises: a third high-frequency oscillator and a second low-frequency oscillator connected in parallel; the operating frequency band of the first high-frequency oscillator, the second high-frequency oscillator, and the third high-frequency oscillator is a first frequency band; the operating frequency band of the first low-frequency oscillator and the second low-frequency oscillator is a second frequency band. Thus, multiple radiating units are arranged on the same surface of the circuit board, and in some radiating units, such as the first radiating unit and the third radiating unit, the high-frequency oscillator and the low-frequency oscillator are connected in parallel, which saves more space, and only single-sided wiring soldering is required, reducing the wiring difficulty, simplifying the manufacturing process, and reducing the production cost. In addition, only one transmission line is required to connect the feeding unit and the multiple radiating units in series, reducing the number of soldering points and the risk of short circuit.

[0008] In an optional implementation, the first radiating unit, the second radiating unit, and the third radiating unit are all center-symmetric structures or axis-symmetric structures. Thus, the first radiating unit, the second radiating unit, and the third radiating unit adopt center-symmetric structures or axis-symmetric structures, so that the oscillator arms of each oscillator are symmetrically arranged, and the symmetry axis passes through the center between the oscillator arms, which is also the center of the radiating unit. Thus, the oscillator of the dual-frequency antenna can be a dipole oscillator.

[0009] In an alternative implementation, the first low-frequency oscillator comprises a first low-frequency oscillator arm and a second low-frequency oscillator arm arranged along the first direction; the first high-frequency oscillator comprises a first high-frequency oscillator arm and a second high-frequency oscillator arm arranged along the first direction; the first low-frequency oscillator arm and the first high-frequency oscillator arm are connected in parallel, and the second low-frequency oscillator arm and the second high-frequency oscillator arm are connected in parallel; the second high-frequency oscillator comprises a third high-frequency oscillator arm and a fourth high-frequency oscillator arm arranged along the first direction; the second low-frequency oscillator comprises a third low-frequency oscillator arm and a fourth low-frequency oscillator arm arranged along the first direction; the third high-frequency oscillator comprises a fifth high-frequency oscillator arm and a sixth high-frequency oscillator arm arranged along the first direction; the third low-frequency oscillator arm and the fifth high-frequency oscillator arm are connected in parallel, and the fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm are connected in parallel. Thus, the first radiation unit, the second radiation unit and the third radiation unit are dipole radiation units, and the first high-frequency oscillator, the second high-frequency oscillator, the third high-frequency oscillator, the first low-frequency oscillator and the second low-frequency oscillator are all dipole oscillators.

[0010] In an alternative implementation, the oscillator arms are all in U-shaped structures, wherein the two oscillator arms connected in parallel share the bottom side of the U-shaped structure, the opening directions of the two oscillator arms connected in parallel are the same, and the opening directions of the two oscillator arms in the same oscillator are opposite. Thus, the oscillator arms are in U-shaped structures, and the two oscillator arms connected in parallel share the bottom side of the U-shaped structure, which can reduce the size of the space occupied by the parallel oscillators, save space, and, compared with the wiring of single-frequency oscillators, does not require additional wiring, reduces the wiring difficulty, simplifies the manufacturing process, and reduces the production cost.

[0011] In an alternative implementation, the lengths l1 of the oscillator arms of the first low-frequency oscillator and the second low-frequency oscillator satisfy: wherein λ1 is the wavelength of the first-band electromagnetic wave, and A1 is an error threshold; the lengths l2 of the oscillator arms of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator satisfy: wherein λ2 is the wavelength of the first-band electromagnetic wave, and A2 is an error threshold. Thus, the physical lengths corresponding to the electrical lengths of the first low-frequency oscillator and the second low-frequency oscillator are close to one-fourth of the wavelength of the first band, i.e., the electromagnetic waves with frequencies located in the first band can be emitted or received. The physical lengths corresponding to the electrical lengths of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator are close to one-fourth of the wavelength of the second band, i.e., the electromagnetic waves with frequencies located in the second band can be emitted or received.

[0012] In an optional implementation, a distance d between the first low-frequency oscillator and the second low-frequency oscillator satisfies |d-λ1|≤A3, where λ1 is the wavelength of the first frequency band electromagnetic wave, and A3 is an error threshold; a distance between the first high-frequency oscillator and the second high-frequency oscillator, and a distance between the second high-frequency oscillator and the third high-frequency oscillator satisfy |D-λ2|≤A4, where λ2 is the wavelength of the second frequency band electromagnetic wave, and A4 is an error threshold. In this way, the distance between adjacent low-frequency oscillators is close to the wavelength of the first frequency band, and the distance between adjacent high-frequency oscillators is close to the wavelength of the second frequency band, so that the gain of the multiple-dipole array antenna of the dual-frequency series-fed antenna in the horizontal plane can be improved.

[0013] In an optional implementation, the first radiation unit includes a coupling branch, the second radiation unit includes a grounding point, the third radiation unit includes a feeding point, and the transmission line includes a first sub-transmission line, a second sub-transmission line, and a third sub-transmission line. The coupling branch is coupled to the first sub-transmission line, the feeding point is connected to the second sub-transmission line, and the grounding point is connected to the third sub-transmission line. In this way, the coupling branch of the first radiation unit is coupled to the first sub-transmission line, the first sub-transmission line can feed the first radiation unit by coupling, the second sub-transmission line can directly feed the third radiation unit, the grounding point of the second radiation unit is connected to the third sub-transmission line, the feeding point of the second radiation unit is connected to the third sub-transmission line, and the second radiation unit can be grounded through the third sub-transmission line. In this way, the first radiation unit is coupled and fed by the transmission line, the third radiation unit is directly fed by a signal, and the second radiation unit is fed by a ground current, so that low frequencies are considered and high-frequency gain is improved.

[0014] In an optional implementation, the first low-frequency oscillator arm and the first high-frequency oscillator arm are coupled to the first sub-transmission line, and the fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm are connected to the second sub-transmission line. In this way, the first sub-transmission line is coupled and fed to the first low-frequency oscillator arm and the first high-frequency oscillator arm by coupling, and the second sub-transmission line directly feeds the fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm.

[0015] In an optional implementation, the coupling branch is U-shaped, the first high-frequency oscillator arm and the first low-frequency oscillator arm have an opening on a bottom side, two ends of the coupling branch are respectively connected to two ends of the opening, and the coupling branch surrounds the first sub-transmission line. In this way, the coupling branch and the first sub-transmission line have a larger coupling size, and the coupling effect of the coupling branch and the first sub-transmission line is improved.

[0016] In an optional implementation, the first sub-transmission line and the second sub-transmission line are first-type transmission lines, and the first-type transmission line includes an inner conductor. In this way, the first-type transmission line can directly feed a radiation unit.

[0017] In an optional implementation, the first type of transmission line further includes an insulating layer between the inner conductor and the circuit board. In this way, by arranging the insulating layer, the inner conductor and the circuit board can be separated.

[0018] In an optional implementation, the first type of transmission line further includes a conductive sheet on a side of the insulating layer away from the circuit board, the conductive sheet being connected to the inner conductor. In this way, by arranging the conductive sheet, the manufacturing of the cable can be simplified, and the impedance can be adjusted more flexibly.

[0019] In an optional implementation, the third sub-transmission line is a second type of transmission line, which includes an inner conductor, an outer conductor, and a dielectric layer, the inner conductor and the outer conductor being coaxial, and the dielectric layer being between the inner conductor and the outer conductor. In this way, the outer conductor of the second type of transmission line is in contact with the circuit board, and grounding can be achieved.

[0020] In an optional implementation, the first radiation unit, the second radiation unit, and the third radiation unit are connected through the third sub-transmission line.

[0021] In an optional implementation, the transmission line further includes a fourth sub-transmission line, the first radiation unit being connected to the feeding unit through the fourth sub-transmission line, and the fourth sub-transmission line being the second type of transmission line. In this way, the second type of transmission line can be used to connect the feeding unit and the plurality of antenna units.

[0022] In an optional implementation, the transmission line further includes a fifth sub-transmission line, a sixth sub-transmission line, and a seventh sub-transmission line, the fourth sub-transmission line being connected to the first sub-transmission line through the fifth sub-transmission line, the first sub-transmission line being connected to the third sub-transmission line through the sixth sub-transmission line, and the third sub-transmission line being connected to the second sub-transmission line through the seventh sub-transmission line, wherein the fifth sub-transmission line, the sixth sub-transmission line, and the seventh sub-transmission line are third type of transmission lines, which include an inner conductor and a dielectric layer, the inner conductor and the dielectric layer being coaxial, and the dielectric layer being outside the inner conductor. In this way, the third type of transmission line can be used to connect the first type of transmission line and the second type of transmission line. The cross-sectional dimensions of the first type of transmission line, the third type of transmission line, and the second type of transmission line increase in turn, and by arranging the third type of transmission line, the transition between the first type of transmission line and the second type of transmission line can be made more gradual and coherent, and the stability of signal transmission is improved.

[0023] In one optional implementation, the first frequency band is a 2.4 GHz band, and the second frequency band is a 5 GHz band. Thus, the dual-band antenna includes two low-frequency elements operating in the 2.4 GHz band and three high-frequency elements operating in the 5 GHz band, and can operate simultaneously in both the first and second frequency bands, improving the combined gain.

[0024] Secondly, a communication device is provided, including a housing, a control circuit, and a dual-band antenna as described above. The control circuit and the dual-band antenna are disposed in the housing and electrically connected. Thus, the communication device, employing the aforementioned dual-band antenna, achieves high gain, saves space, reduces wiring complexity, and lowers production costs.

[0025] In one alternative implementation, the communication device is a router. Therefore, the dual-band antenna can be used in a router, improving communication performance.

[0026] This application provides a dual-band antenna and a communication device. The dual-band antenna includes: a feed unit, a circuit board, and a first radiating unit, a second radiating unit, a third radiating unit, and a transmission line disposed on a first surface of the circuit board. The first, second, and third radiating units are arranged sequentially along a first direction on the first surface and connected in series via the transmission line. The first radiating unit is also connected to the feed unit via the transmission line. The feed unit is used to transmit or receive signals through the transmission line. By disposing of multiple radiating units on the same surface of the circuit board, only single-sided wiring and soldering are required, reducing wiring difficulty, simplifying the manufacturing process, and lowering production costs. The first radiating unit includes: a first high-frequency vibrator and a first low-frequency vibrator connected in parallel; the second radiating unit includes: a second high-frequency vibrator; the third radiating unit includes: a third high-frequency vibrator and a second low-frequency vibrator connected in parallel; the operating frequency band of the first, second, and third high-frequency vibrators is a first frequency band, and the operating frequency band of the first and second low-frequency vibrators is a second frequency band. Therefore, in the first and third radiating units, the high-frequency and low-frequency oscillators are connected in parallel, saving more space. In addition, only one transmission line is needed to connect the power supply unit and multiple radiating units in series, reducing solder joints and lowering the risk of short circuits. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a dual-frequency dual-fed antenna;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure of the first surface of a dual-frequency dual-fed antenna;

[0029] Figure 3 for Figure 1 A schematic diagram of the structure of the second surface of a dual-frequency dual-fed antenna;

[0030] Figure 4 A structure schematic diagram of a side of a dual-frequency antenna provided for an embodiment of the present application;

[0031] Figure 5 A structure schematic diagram of a first surface of a first dual-frequency antenna provided for an embodiment of the present application;

[0032] Figure 6 A structure schematic diagram of a first radiation unit provided for an embodiment of the present application; Figure 4 A structure schematic diagram of a first radiation unit provided for an embodiment of the present application;

[0033] Figure 7 A structure schematic diagram of a second radiation unit provided for an embodiment of the present application; Figure 4 A structure schematic diagram of a second radiation unit provided for an embodiment of the present application;

[0034] Figure 8 A structure schematic diagram of a third radiation unit provided for an embodiment of the present application; Figure 4 A structure schematic diagram of a third radiation unit provided for an embodiment of the present application;

[0035] Figure 9 A structure schematic diagram of a first type of transmission line provided for an embodiment of the present application;

[0036] Figure 10 A structure schematic diagram of a second type of transmission line provided for an embodiment of the present application;

[0037] Figure 11 A cross-sectional view of a second type of transmission line provided for an embodiment of the present application;

[0038] Figure 12 A structure schematic diagram of a third type of transmission line provided for an embodiment of the present application;

[0039] Figure 13 A cross-sectional view of a third type of transmission line provided for an embodiment of the present application;

[0040] Figure 14 A structure schematic diagram of a first surface of a second dual-frequency antenna provided for an embodiment of the present application;

[0041] Figure 15 A structure schematic diagram of a first surface of a third dual-frequency antenna provided for an embodiment of the present application;

[0042] Figure 16 A structure schematic diagram of a first surface of a fourth dual-frequency antenna provided for an embodiment of the present application;

[0043] Figure 17 A structure schematic diagram of a first surface of a fifth dual-frequency antenna provided for an embodiment of the present application

[0044] Figure 18 A radiation pattern diagram of a dual-frequency antenna in a first frequency band provided for an embodiment of the present application;

[0045] Figure 19 The radiation pattern of the dual-band antenna provided by the embodiment of the present application in the second frequency band is shown. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0047] Hereinafter, the terms "first", "second", and the like are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0048] In addition, in the present application, the orientation terms such as "upper", "lower", and the like are defined with respect to the orientation of the components shown in the drawings, and it should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0049] Hereinafter, the terms that may appear in the embodiments of the present application are explained.

[0050] Dipole antenna: composed of a pair of symmetrically placed conductors, the two ends of the conductors close to each other are connected to the feeder line respectively. When used as a transmitting antenna, the electrical signal is fed into the conductor from the center of the antenna; when used as a receiving antenna, the received signal is also obtained from the conductor at the center of the antenna.

[0051] Transmission line refers to the connection line between the transceiver of the antenna and the radiator. The transmission line can directly transmit current wave or electromagnetic wave according to different frequencies and forms. The connection between the radiator and the transmission line is usually called the feed point. The transmission line includes wire transmission line, coaxial transmission line, waveguide, or microstrip line, etc. The transmission line can include a support antenna body or a glass antenna body according to the implementation form. The transmission line can be realized by LCP (Liquid Crystal Polymer), FPC (Flexible Printed Circuit), or PCB (Printed Circuit Board) according to the carrier.

[0052] Ground / Ground Plane: can refer to at least one part of any ground layer, or ground plane, or ground metal layer, or any combination of the above in a communication device, which can be used for grounding of components in the communication device. In one embodiment, the circuit board can be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14 layer board with 8, 10, 12, 13, or 14 layers of conductive material, or elements separated and electrically insulated by a dielectric or insulating layer such as fiberglass, polymer, etc. In one embodiment, the circuit board includes a dielectric substrate, a ground layer, and a trace layer, which are electrically connected by vias.

[0053] Any ground layer, or ground plane, or ground metal layer described above can be made of conductive material. In one embodiment, the conductive material can be any of the following: copper, aluminum, stainless steel, brass, and alloys thereof, copper foil on an insulating substrate, aluminum foil on an insulating substrate, gold foil on an insulating substrate, silver-plated copper, silver-plated copper foil on an insulating substrate, silver foil on an insulating substrate, and tin-plated copper, graphite powder impregnated cloth, graphite-coated substrate, copper-plated substrate, brass-plated substrate, and aluminum-plated substrate. Those skilled in the art will understand that the ground layer / ground plane / ground metal layer can also be made of other conductive materials.

[0054] Connect / Connected: can refer to a mechanical connection or a physical connection, i.e., A and B are connected or A and B are connected can mean that there is a fastening member (such as a screw, bolt, rivet, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0055] Coupling: can be understood as direct coupling and / or indirect coupling, and "coupling connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be referred to as "electrical connection", which means that the components are in physical contact and electrically conductive; it can also be understood as a form of connection between different components in a circuit structure through a physical circuit that can transmit electrical signals, such as a copper foil or a wire on a printed circuit board (PCB); "indirect coupling" can be understood as electrical conduction between two conductors through a space without contact. In one embodiment, indirect coupling can also be referred to as capacitive coupling, for example, through the coupling between the gap between two conductive parts to form an equivalent capacitor to achieve signal transmission.

[0056] Through the above "electrical connection" or "indirect coupling", two or more components are electrically connected or in communication to transmit signals / energy.

[0057] Figure 1 A side view of a dual-band dual-feed antenna is shown in FIG. 1, which includes a ground plane 100, a first feed line 110, a second feed line 120, a first radiating element 130, and a second radiating element 140. The first feed line 110 and the second feed line 120 are connected to the ground plane 100, and the first radiating element 130 and the second radiating element 140 are connected to the first feed line 110 and the second feed line 120, respectively. Figure 1As shown, the dual-band dual-feed antenna includes a printed circuit board (PCB) 10, which includes a first surface 11 and a second surface 12 facing away from each other. The first surface 11 is provided with at least two low-frequency vibrators 20, and the second surface 12 is provided with at least three high-frequency vibrators 30. The at least two low-frequency vibrators 20 are arranged in sequence along a first direction y on the first surface 11, and the at least three high-frequency vibrators 30 are arranged in sequence along the first direction y on the second surface 12. The first direction y can be the extension direction of the antenna. That is, the two side surfaces of the printed circuit board 10 of the dual-band dual-feed antenna are respectively provided with low-frequency vibrators 20 and high-frequency vibrators 30.

[0058] The printed circuit board 10 can be made of a flame-retardant material (FR-4) medium plate, a Rogers medium plate, a hybrid medium plate of Rogers and FR-4, etc. Here, FR-4 is a code of a flame-retardant material grade, and the Rogers medium plate is a high-frequency plate. The printed circuit board 10 carries electronic components such as radio frequency chips, etc.

[0059] In an embodiment, a metal layer can be provided on the printed circuit board 10. The metal layer can be used for grounding of the electronic components carried on the printed circuit board 10, and can also be used for grounding of other components such as support antennas, frame antennas, etc. The metal layer can be referred to as a ground plate, or a grounding plate, or a grounding layer. In an embodiment, the metal layer can be formed by etching metal on the surface of any one of the medium plates in the printed circuit board 10. In an embodiment, the edge of the printed circuit board 10 can be regarded as the edge of its grounding layer.

[0060] Figure 2 For Figure 1 The structure of the first surface of the dual-band dual-feed antenna is shown in FIG. 2. As shown in FIG. 2, the first surface 11 of the printed circuit board 10 is provided with at least two low-frequency vibrators 20, and the second surface 12 of the printed circuit board 10 is provided with at least three high-frequency vibrators 30. The at least two low-frequency vibrators 20 are arranged in sequence along a first direction y on the first surface 11, and the at least three high-frequency vibrators 30 are arranged in sequence along the first direction y on the second surface 12. The first direction y can be the extension direction of the antenna. That is, the two side surfaces of the printed circuit board 10 of the dual-band dual-feed antenna are respectively provided with low-frequency vibrators 20 and high-frequency vibrators 30. Figure 1 and Figure 2As shown in the figure, the first surface 11 of the printed circuit board 10 is sequentially provided with a first low-frequency dipole vibrator 21, a second low-frequency dipole vibrator 22, and an n-th low-frequency dipole vibrator along the first direction y, where n is a positive integer of at least 2. Adjacent low-frequency vibrators 20 are electrically connected by a first transmission line 1, that is, the first low-frequency dipole vibrator 21 and the second low-frequency dipole vibrator 22 are electrically connected by the first transmission line 1, and the n-1th low-frequency dipole vibrator and the n-th low-frequency dipole vibrator are electrically connected by another first transmission line 1. All the low-frequency vibrators 20 are sequentially connected, and adjacent low-frequency vibrators 20 are electrically connected by a first transmission line 1. Specifically, when the antenna includes n low-frequency vibrators 20, it includes n-1 first transmission lines 1. The first low-frequency dipole vibrator 21 is located at the feed-in end, and the first low-frequency dipole vibrator 21 is electrically connected to the first feed line 3. Specifically, the first transmission line 1 and the first feed line 3 are electrically connected through the first low-frequency dipole vibrator 21 to realize signal transmission.

[0061] Figure 3 For Figure 1 The structure diagram of the second surface of the dual-frequency dual-feed antenna is shown in the figure. Figure 1 and Figure 3 As shown in the figure, the second surface 12 of the printed circuit board 10 is sequentially provided with a first high-frequency dipole vibrator 31, a second high-frequency dipole vibrator 32, and an m-th high-frequency dipole vibrator along the first direction y, where m is a positive integer of at least 3. Adjacent high-frequency vibrators 30 are electrically connected by a second transmission line 2, that is, the first high-frequency dipole vibrator 31 and the second high-frequency dipole vibrator 32 are electrically connected by the second transmission line 2, and the m-1th high-frequency dipole vibrator and the m-th high-frequency dipole vibrator are electrically connected by another second transmission line 2. All the high-frequency vibrators 30 are sequentially connected, and adjacent high-frequency vibrators 30 are electrically connected by a second transmission line 2. Specifically, when the antenna includes m high-frequency dipole vibrators 2, it includes m-1 second transmission lines 2. The first high-frequency dipole vibrator 31 is located at the feed-in end, and one end of the first high-frequency dipole vibrator 31 is electrically connected to the second transmission line 2, and the other end is electrically connected to the second feed line 4. Specifically, the second feed line 4 and the second transmission line 2 are electrically connected through the first high-frequency dipole vibrator 31 to realize signal transmission.

[0062] The high-frequency antenna and the low-frequency antenna of the dual-frequency dual-feed antenna are respectively located on the front and back surfaces of the circuit board, arranged back-to-back, both are series-fed array antennas, the radiation units are connected by coaxial cables, high gain and horizontal coverage are realized, there are two feed ports, and each is independent. However, cables need to be welded on the circuit board, the welding points are many and dense, easy to short circuit, the process is complex, and the cost is high.

[0063] Therefore, an improved antenna is provided in the embodiments of the present application.

[0064] Figure 4 A structure diagram of a side of a dual-frequency antenna is provided for an embodiment of the present application. As shown in the figure, the dual-frequency dual-feed antenna comprises a printed circuit board 10, which comprises a first surface 11 and a second surface 12 facing away from each other. The first surface 11 is provided with three radiation units 200: a first radiation unit 201, a second radiation unit 202, and a third radiation unit 203. The three radiation units 200 are arranged in sequence along a first direction y on the first surface 11. Figure 4

[0065] Adjacent radiation units are electrically connected through a transmission line 300, that is, the first radiation unit 201 and the second radiation unit 202 are electrically connected through a transmission line 300, and the n-1th radiation unit and the nth radiation unit are electrically connected through another transmission line 300. All the radiation units are connected in sequence, and adjacent radiation units are electrically connected through a transmission line 300. Specifically, when the antenna comprises n radiation units, it comprises n-1 transmission lines 300. The first radiation unit 201 is located at the feed-in end, and the first radiation unit 201 is electrically connected to the feed unit through a transmission line to realize signal transmission.

[0066] The feed unit is a combination of all components of an antenna for the purpose of receiving and transmitting radio waves. In the case of a receiving antenna, the feed unit can be considered as the antenna part from the first amplifier to the front-end transmitter. In a transmitting antenna, the feed unit can be considered as the part after the last power amplifier. In some cases, the "feed unit" is narrowly understood as a radio frequency chip, or a transmission path including a radio frequency chip to a feed point on a radiator or a transmission line. The feed unit has the function of converting radio waves into electrical signals and sending them to the receiver components. Generally, it is considered as part of the antenna for converting radio waves into electrical signals, and vice versa. The antenna design should consider the possibility of maximum power transmission and efficiency. For this purpose, the antenna feed impedance must be matched to the load resistance. The antenna feed impedance is a combination of resistance, capacitance, and inductance. To ensure maximum power transmission conditions, the two impedances (load resistance and feed impedance) should be matched. The matching can be done by considering the frequency requirements and the design parameters of the antenna (such as gain, directivity, and radiation efficiency).

[0067] Figure 5 A structure diagram of a first surface of a dual-frequency antenna is provided for an embodiment of the present application. As shown in the figure, the first radiation unit 201 comprises a first high-frequency oscillator 2011 and a first low-frequency oscillator 2012 in parallel. The second radiation unit comprises a second high-frequency oscillator 2021. The third radiation unit comprises a third high-frequency oscillator 2031 and a second low-frequency oscillator 2032 in parallel. Figure 5

[0068] ​​In some embodiments, the first low-frequency vibrator 2012 and the second low-frequency vibrator 2032 operate in a first frequency band, and the first high-frequency vibrator 2011, the second high-frequency vibrator 2021 and the third high-frequency vibrator 2031 operate in a second frequency band. The lowest frequency of the first frequency band is higher than the highest frequency of the second frequency band. For example, the first frequency band is the 2.4 GHz frequency band, and the second frequency band is the 5 GHz frequency band.

[0069] In some embodiments, the size of the circuit board first surface 11 in the y direction is 132 mm, and the size in the x direction is 13 mm, so that the overall size is small, which is beneficial to reduce the size of the whole machine.

[0070] The dual-frequency antenna provided in the application includes two low-frequency vibrators operating in the 2.4 GHz frequency band and three high-frequency vibrators operating in the 5 GHz frequency band, so that the combined gain is improved.

[0071] The dual-frequency antenna provided in the application arranges multiple radiation units on the same surface of the circuit board, and in some radiation units, the high-frequency vibrator and the low-frequency vibrator are connected in parallel, so that the space is saved, only single-sided wiring and welding are needed, the wiring difficulty is reduced, the manufacturing process is simplified, and the production cost is reduced.

[0072] In addition, only one transmission line 300 is needed to connect the feeding unit and the multiple radiation units in series, so that the welding points are reduced, and the short circuit risk is reduced.

[0073] In some embodiments, the center of the first high-frequency vibrator 2011 coincides with the center of the first low-frequency vibrator 2012, and the center of the third high-frequency vibrator 2031 coincides with the center of the second low-frequency vibrator 2032.

[0074] The structure of the dual-frequency antenna provided in the application will be described below. Figure 5-8 The structure of the dual-frequency antenna provided in the application will be described below.

[0075] In some embodiments, the first radiation unit 201, the second radiation unit 202 and the third radiation unit 203 adopt a central symmetry structure or an axial symmetry structure, so that the vibrator arms in each radiation unit are symmetrically arranged, the symmetry axis passes through the center between the vibrator arms, and the center is also the center of the radiation unit. Therefore, the vibrator of the dual-frequency antenna can be a dipole vibrator.

[0076] In some embodiments, the first high-frequency vibrator 2011 and the first low-frequency vibrator 2012 are both dipole vibrators. As shown in Figure 5 The first radiation unit 201 includes the first high-frequency vibrator 2011 and the first low-frequency vibrator 2012 connected in parallel.

[0077] The structure of the dual-frequency antenna provided in the application will be described below. Figure 6 The structure of the dual-frequency antenna provided in the application will be described below. Figure 5The structure of the first radiating unit 201 in the first embodiment is further described. As shown in Figure 6 The first high-frequency vibrator includes first high-frequency vibrator arms 2011a and second high-frequency vibrator arms 2011b arranged along the first direction.

[0078] The first low-frequency dipole vibrator includes first low-frequency vibrator arms 2012a and second low-frequency vibrator arms 2012b arranged along the first direction.

[0079] The first high-frequency vibrator arms 2011a and the first low-frequency vibrator arms 2012a are in parallel, and the second high-frequency vibrator arms 2011b and the second low-frequency vibrator arms 2012b are in parallel.

[0080] The first high-frequency vibrator arms 2011a and the first low-frequency vibrator arms 2012a are both in U-shaped structure, and have the same opening direction, and the first high-frequency vibrator arms 2011a and the first low-frequency vibrator arms 2012a share the bottom edge of the U-shaped structure.

[0081] The second high-frequency vibrator arms 2011b and the second low-frequency vibrator arms 2012b are both in U-shaped structure, and have the same opening direction, and the second high-frequency vibrator arms 2011b and the second low-frequency vibrator arms 2012b share the bottom edge of the U-shaped structure.

[0082] The opening direction of the first high-frequency vibrator arms 2011a and the second high-frequency vibrator arms 2011b is opposite, as shown in Figure 6 The opening direction of the first high-frequency vibrator arms 2011a is in the +y direction, and the opening direction of the second high-frequency vibrator arms 2011b is in the -y direction.

[0083] The opening direction of the first low-frequency vibrator arms 2012a and the second low-frequency vibrator arms 2012b is opposite, as shown in Figure 6 The opening direction of the first low-frequency vibrator arms 2012a is in the +y direction, and the opening direction of the second low-frequency vibrator arms 2012b is in the -y direction.

[0084] Therefore, the vibrator arms adopt U-shaped structure, and the two parallel vibrator arms share the bottom edge of the U-shaped structure, which can reduce the space occupied by the parallel vibrator, save space, and compared with the wiring of the single-frequency vibrator, without the need to additionally increase the wiring, reduce the wiring difficulty, simplify the manufacturing process, and reduce the production cost.

[0085] Next, referring to Figure 5 The second radiating unit 202 includes a second high-frequency vibrator 2021.

[0086] In some embodiments, the second radiating unit is a dipole radiating unit, and the second high-frequency vibrator 2021 is a dipole vibrator. As shown in Figure 5 The second radiating unit 202 includes a second high-frequency vibrator 2021.

[0087] The following is combined with Figure 7 right Figure 5 The structure of the second radiating unit 202 will be further explained. For example... Figure 7 As shown, the second high-frequency oscillator 2021 includes a third high-frequency oscillator arm 2021a and a fourth high-frequency oscillator arm 2021b arranged along the first direction.

[0088] Among them, the third high-frequency oscillator arm 2021a and the fourth high-frequency oscillator arm 2021b are both U-shaped structures with opposite opening directions. The opening direction of the third high-frequency oscillator arm 2021a is the +y direction, and the opening direction of the fourth high-frequency oscillator arm 2021b is the -y direction.

[0089] The third radiating unit 203 includes: a third high-frequency oscillator 2031 and a second low-frequency oscillator 2032 connected in parallel.

[0090] In some embodiments, the third radiating element 203 is a dipole antenna, wherein the third high-frequency vibrator 2031 and the second low-frequency vibrator 2032 are both dipole vibrators. For example... Figure 5 As shown, the third radiating unit 203 includes: a third high-frequency oscillator 2031 and a second low-frequency oscillator 2032 connected in parallel.

[0091] The following is combined with Figure 8 right Figure 5 The structure of the third radiating unit 203 will be further explained. For example... Figure 8 As shown, the second low-frequency oscillator 2032 includes a third low-frequency oscillator arm 2032a and a fourth low-frequency oscillator arm 2032b arranged along the first direction.

[0092] The third high-frequency oscillator 2031 includes a fifth high-frequency oscillator arm 2031a and a sixth high-frequency oscillator arm 2031b arranged along the first direction.

[0093] The third low-frequency oscillator arm 2032a and the fifth high-frequency oscillator arm 2031a are connected in parallel, and the fourth low-frequency oscillator arm 2032b and the sixth high-frequency oscillator arm 2031b are connected in parallel.

[0094] The third low-frequency vibrator arm 2032a and the fifth high-frequency vibrator arm 2031a are both U-shaped structures with the same opening direction. The third low-frequency vibrator arm 2032a and the fifth high-frequency vibrator arm 2031a share the bottom edge of the "U"-shaped structure.

[0095] The fourth low-frequency oscillator arm 2032b and the sixth high-frequency oscillator arm 2031b are both U-shaped structures with the same opening direction. The fourth low-frequency oscillator arm 2032b and the sixth high-frequency oscillator arm 2031b share the bottom edge of the "U"-shaped structure.

[0096] The opening directions of the third low-frequency vibrator arm 2032a and the fourth low-frequency vibrator arm 2032b are opposite, as shown in FIG. 3B. The opening direction of the third low-frequency vibrator arm 2032a is the +y direction, and the opening direction of the fourth low-frequency vibrator arm 2032b is the -y direction. Figure 6

[0097] The opening directions of the fifth high-frequency vibrator arm 2031a and the sixth high-frequency vibrator arm 2031b are opposite, as shown in FIG. 3B. The opening direction of the fifth high-frequency vibrator arm 2031a is the +y direction, and the opening direction of the sixth high-frequency vibrator arm 2031b is the -y direction. Figure 6

[0098] The U-shaped structure is shared by the two parallel vibrator arms, which can reduce the space occupied by the parallel vibrator arms, save space, and reduce the difficulty of wiring and the manufacturing process and the production cost.

[0099] In some embodiments of the present application, the length l1 of the vibrator arm of the first low-frequency vibrator 2012 and the second low-frequency vibrator 2032 satisfies: wherein λ1 is the wavelength of the first frequency band electromagnetic wave, and A1 is an error threshold. In some embodiments, A1 is about

[0100] Therefore, the physical length corresponding to the electrical length of the first low-frequency vibrator 2012 and the second low-frequency vibrator 2032 is close to one quarter of the wavelength of the first frequency band, i.e., the electromagnetic wave with a frequency in the first frequency band can be transmitted or received.

[0101] In some embodiments of the present application, the length l2 of the vibrator arm of the first high-frequency vibrator 2011, the second high-frequency vibrator 2021, and the third high-frequency vibrator 2031 satisfies: wherein λ2 is the wavelength of the first frequency band electromagnetic wave, and A2 is an error threshold. In some embodiments, A2 is about

[0102] Therefore, the physical length corresponding to the electrical length of the first high-frequency vibrator 2011, the second high-frequency vibrator 2021, and the third high-frequency vibrator 2031 is close to one quarter of the wavelength of the second frequency band, i.e., the electromagnetic wave with a frequency in the second frequency band can be transmitted or received.

[0103] In some embodiments of the present application, the distance d between the first low-frequency vibrator 2012 and the second low-frequency vibrator 2032 satisfies: |d-λ1|≤A3, wherein λ1 is the wavelength of the first frequency band electromagnetic wave, and A3 is an error threshold. In some embodiments, A3 is about ​​

[0104] In some embodiments of this application, the spacing between the first high-frequency oscillator 2011 and the second high-frequency oscillator 2021, and the spacing D between the second high-frequency oscillator 2021 and the third high-frequency oscillator 2031, satisfy: |D-λ2|≤A4, where λ2 is the wavelength of the second frequency band electromagnetic wave, and A4 is an error threshold. In some embodiments, A4 is approximately

[0105] Therefore, the spacing between adjacent low-frequency vibrators is close to one times the wavelength of the first frequency band, and the spacing between adjacent high-frequency vibrators is close to one times the wavelength of the second frequency band, which can improve the gain of the dual-frequency series-fed dipole array antenna in the horizontal plane.

[0106] The following is combined Figure 5-13 The structure of transmission line 300 is described.

[0107] In some embodiments, such as Figure 5 As shown, the first radiating unit 201 includes a coupling stub 2013, the second radiating unit 202 includes a grounding point, the third radiating unit 203 includes a power supply point, and the transmission line 300 includes a first sub-transmission line 301, a second sub-transmission line 302, and a third sub-transmission line 303. The coupling stub 2013 is coupled to the first sub-transmission line 301, the power supply point is connected to the second sub-transmission line 302, and the grounding point is connected to the third sub-transmission line 303.

[0108] In other embodiments, such as Figure 5 As shown, the transmission line 300 also includes: a fourth sub-transmission line 304, a fifth sub-transmission line 305, a sixth sub-transmission line 306, and a seventh sub-transmission line 307.

[0109] In some embodiments, the first sub-transmission line 301 and the second sub-transmission line 302 are first-type transmission lines. The following describes their use in conjunction with... Figure 9 right Figure 5 The structure of the first type of transmission line will be described. For example... Figure 9 As shown, the first type of transmission line 31 includes: a first inner conductor 31a.

[0110] In some embodiments, the first type of transmission line 31 can be formed by stripping a coaxial cable. The coaxial cable includes at least an inner conductor, a dielectric layer, and an outer conductor arranged coaxially, with the dielectric layer located between the inner conductor and the outer conductor. The outer conductor and the dielectric layer can be removed by stripping to obtain the first inner conductor 31a.

[0111] In some embodiments, the first type of transmission line 31 further comprises an insulating layer 31b between the second inner conductor 3021a and the circuit board. Thus, by arranging the insulating layer 31b, the second inner conductor 3021b and the circuit board can be separated. In some embodiments, the insulating layer can be the insulating layer of a coaxial cable. The insulating layer can be made of polypropylene or polyethylene, etc.

[0112] In some embodiments, the first type of transmission line 31 further comprises a conductive sheet 31c on the side of the second inner conductor 3021a away from the insulating layer 31b, the conductive sheet 31c being connected to the inner conductor 31a.

[0113] In some embodiments, the width of the conductive sheet 31c is greater than the width of the inner conductor 31a. Thus, by arranging the conductive sheet 31c, the conductor size of the inner conductor 31a can be increased, the manufacturing process of the cable can be simplified, and the impedance can be adjusted more flexibly.

[0114] In some embodiments, as shown in FIG. 2, the arms of the radiating elements at both ends of the circuit board are electrically connected to the first type of transmission line. Figure 5

[0115] For example, the first sub-transmission line 301 is coupled to the vibrator in the first radiating element 201 away from the second radiating element 202, that is, as shown in FIG. 2, the first low-frequency vibrator arm 2012a and the first high-frequency vibrator arm 2011a are coupled to the first sub-transmission line 301. Figure 6

[0116] As shown in FIG. 2, the first low-frequency vibrator arm 2012a and the first high-frequency vibrator arm 2011a further comprise a coupling branch 2013 coupled to the first sub-transmission line 301. Thus, the first radiating element 201 can be coupled and fed by the first sub-transmission line 301. Figure 6

[0117] In some embodiments, the coupling branch 2013 is U-shaped, the first low-frequency vibrator arm 2012a and the first high-frequency vibrator arm 2011a are provided with an opening on the bottom side of the U-shape, the two ends of the coupling branch 2013 are respectively connected to the two ends of the opening, and the coupling branch 2013 is arranged around the second sub-transmission line 302.

[0118] The direction of the U-shaped opening of the coupling branch 2013 is opposite to the direction of the U-shaped opening of the first low-frequency vibrator arm 2012a and the first high-frequency vibrator arm 2011a.

[0119] In some embodiments, the second sub-transmission line 302 is electrically connected to the vibrator in the third radiating element 203 away from the second radiating element 202, as shown in FIG. 2. Figure 8 ​​​As shown, the fourth low-frequency vibrator arm 2032b and the sixth high-frequency vibrator arm 2031b are electrically connected to the second sub-transmission line 302. Therefore, the third radiating unit 203 can be directly fed through the second sub-transmission line 302.

[0120] In some embodiments, the third sub-transmission line 303 and the fourth sub-transmission line 304 are second-type transmission lines.

[0121] The following is combined with Figure 10 , Figure 11 right Figure 5 The structure of the second type of transmission line will be explained. For example... Figure 10 , Figure 11 As shown, the second type of transmission line 32 includes: a second inner conductor 32a, an outer conductor 32b, and a first dielectric layer 32c. The second inner conductor 32a and the outer conductor 32b are coaxial, the first dielectric layer 32c is located between the second inner conductor 32a and the outer conductor 32b, and the outer conductor 32b is connected to the printed circuit board 10.

[0122] The first radiation unit 201, the second radiation unit 202, and the third radiation unit 203 are connected by the third sub-transmission line 303.

[0123] The first radiating unit 201 is connected to the feeding unit via the fourth sub-transmission line 304.

[0124] like Figure 5 As shown, the first radiating unit 201 is connected to the second radiating unit 202 via the second sub-transmission line 302, and the second radiating unit 202 is connected to the third radiating unit 203 via the second sub-transmission line 302. The first radiating unit 201 is also connected to the power supply port via the fourth sub-transmission line 304.

[0125] Therefore, the second type of transmission line 32 can connect the radiating unit and the feed port, and can also be used to connect multiple radiating units.

[0126] Among them, such as Figure 5 As shown, the second radiation unit 202 is connected to the first sub-transmission line 301. The outer conductor 32b of the first sub-transmission line 301 is connected to the printed circuit board 10, so that the outer conductor 32b is grounded, and an induced current is generated on the printed circuit board 10. The second radiation unit 202 radiates under the action of the induced current on the printed circuit board 10.

[0127] Optionally, to make the transition between the first type of transmission line 31 and the second type of transmission line 32 smoother and more continuous, such as... Figure 5 As shown, transmission line 300 also includes: fifth sub-transmission line 305, sixth sub-transmission line 306 and seventh sub-transmission line 307.

[0128] In some embodiments, the fifth sub-transmission line 305, the sixth sub-transmission line 306, and the seventh sub-transmission line 307 are third-class transmission lines.

[0129] The following is combined with Figure 12 , Figure 13 right Figure 5 The structure of the second type of transmission line will be explained. For example... Figure 12 , Figure 13 As shown, the third type of transmission line 33 includes: a third inner conductor 33a and a second dielectric layer 33b, the second inner conductor 33a and the second dielectric layer 33b are coaxial, and the second dielectric layer 33b is located outside the third inner conductor 33a.

[0130] like Figure 5 As shown, the fourth sub-transmission line 304 (second type transmission line 32) is connected to the first sub-transmission line 301 (first type transmission line 31) via the fifth sub-transmission line 305 (third type transmission line 33), the first sub-transmission line 301 (first type transmission line 31) is connected to the third sub-transmission line 303 (second type transmission line 32) via the sixth sub-transmission line 306 (third type transmission line 33), and the third sub-transmission line 303 (second type transmission line 32) is connected to the second sub-transmission line 302 (first type transmission line 31) via the seventh sub-transmission line 307 (third type transmission line 33).

[0131] See Figure 5 The third type of transmission line 33 can be used to connect the first type of transmission line 31 and the second type of transmission line 32. The cross-sectional dimensions of the first type of transmission line 31, the third type of transmission line 33 and the second type of transmission line 32 increase sequentially. By setting the third type of transmission line 33, the transition between the first type of transmission line 31 and the second type of transmission line 32 can be smoother and more continuous, thus improving the stability of signal transmission.

[0132] In some embodiments, the third type transmission line 33 can be formed by stripping a coaxial cable. The coaxial cable includes at least an inner conductor, a dielectric layer, and an outer conductor arranged coaxially, with the dielectric layer located between the inner conductor and the outer conductor. The outer conductor can be removed by stripping to obtain the third type transmission line 33.

[0133] The outer layer of the third type of transmission line 33 is a second dielectric layer 33b, which can separate the third inner conductor 33a from the circuit board to avoid loss at the third sub-transmission line 303. At the same time, it can separate the first sub-transmission line 301 and the second sub-transmission line 302.

[0134] In some embodiments, the first transmission line 31, the second transmission line 32 and the third transmission line 33 are the same transmission line, and a complete second transmission line can be selected and ring-stripped at a preset position to form the first transmission line 31 and the third transmission line 33, which are used as a complete transmission line in the dual-frequency antenna.

[0135] When the dual-frequency antenna works, the signal fed by the feeding unit can be transmitted to the first sub-transmission line 301 through the fourth sub-transmission line 304 and the fifth sub-transmission line 305 in sequence, and then coupled and fed to the first radiating unit 201 through the first sub-transmission line 301. Then, the signal is transmitted to the second sub-transmission line 302 through the sixth sub-transmission line 306, the third sub-transmission line 303 and the seventh sub-transmission line 307 in sequence, and then directly fed to the third radiating unit 203 through the second sub-transmission line 302. The second radiating unit 202 is connected with the third sub-transmission line 303, and can be grounded through the third sub-transmission line 303.

[0136] The embodiments of the present application do not limit the shape of the vibrator arm. In other embodiments, as shown in Figure 14 , Figure 15 , Figure 16 , Figure 17 indicated, the vibrator arm adopts an "L" shaped structure. The "L" shaped structure includes a first side and a second side, the first side is parallel to the x-axis, and the second side is parallel to the y-axis.

[0137] As shown in Figure 14 , the first radiating unit 201 includes a first high-frequency vibrator 2011 and a first low-frequency vibrator 2012 in parallel. The first high-frequency vibrator 2011 includes a first high-frequency vibrator arm and a second high-frequency vibrator arm arranged along a first direction.

[0138] The first low-frequency vibrator 2012 includes a first low-frequency vibrator arm and a second low-frequency vibrator arm arranged along the first direction.

[0139] The first high-frequency vibrator arm and the first low-frequency vibrator arm are both in an "L" shaped structure, and the first high-frequency vibrator arm and the first low-frequency vibrator arm share a first side of the "L" shaped structure.

[0140] The second high-frequency vibrator arm and the second low-frequency vibrator arm are both in an "L" shaped structure, and the second high-frequency vibrator arm and the second low-frequency vibrator arm share a first side of the "L" shaped structure.

[0141] Among them, the second sides of the first high-frequency vibrator arm and the second high-frequency vibrator arm extend in opposite directions, as shown in Figure 14 , the second side of the first high-frequency vibrator arm extends in the +y direction, and the second side of the second high-frequency vibrator arm extends in the -y direction.

[0142] The second sides of the first low-frequency vibrator arm and the second low-frequency vibrator arm extend in opposite directions, as shown inFigure 14 As shown, the second edge of the first low-frequency vibrator arm extends in the +y direction, and the second edge of the second low-frequency vibrator arm extends in the -y direction.

[0143] Thus, the vibrator arm adopts an L-shaped structure, and the two parallel vibrator arms share the first edge of the L-shaped structure, which can reduce the space occupied by the parallel vibrator, save space, and reduce the wiring difficulty, simplify the manufacturing process, and reduce the production cost without additional wiring compared with the wiring of the single-frequency vibrator.

[0144] Next, referring to Figure 14 The second radiation unit 202 includes a second high-frequency vibrator 2021.

[0145] In some embodiments, the second radiation unit is a dipole radiation unit, and the second high-frequency vibrator 2021 is a dipole vibrator. As shown in Figure 14 The second radiation unit 202 includes a second high-frequency vibrator 2021.

[0146] As shown in Figure 14 The second high-frequency vibrator 2021 includes a third high-frequency vibrator arm and a fourth high-frequency vibrator arm arranged along the first direction.

[0147] The third high-frequency vibrator arm and the fourth high-frequency vibrator arm are both L-shaped structures, and the second edges extend in opposite directions. The second edge of the third high-frequency vibrator arm extends in the +y direction, and the second edge of the fourth high-frequency vibrator arm extends in the -y direction.

[0148] The third radiation unit 203 includes a third high-frequency vibrator 2031 and a second low-frequency vibrator 2032 connected in parallel.

[0149] In some embodiments, the third radiation unit 203 is a dipole antenna, and the third high-frequency vibrator 2031 and the second low-frequency vibrator 2032 are both dipole vibrators. As shown in Figure 5 The third radiation unit 203 includes a third high-frequency vibrator 2031 and a second low-frequency vibrator 2032 connected in parallel.

[0150] As shown in Figure 14 The second low-frequency vibrator 2032 includes a third low-frequency vibrator arm and a fourth low-frequency vibrator arm arranged along the first direction.

[0151] The third high-frequency vibrator 2031 includes a fifth high-frequency vibrator arm and a sixth high-frequency vibrator arm arranged along the first direction.

[0152] The third low-frequency vibrator arm and the fifth high-frequency vibrator arm are connected in parallel, and the fourth low-frequency vibrator arm and the sixth high-frequency vibrator arm are connected in parallel.

[0153] Both the third low-frequency vibrating arm and the fifth high-frequency vibrating arm are L-shaped structures, and the second side extends in the same direction. The third low-frequency vibrating arm and the fifth high-frequency vibrating arm share the first side of the L-shaped structure.

[0154] Both the fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm are L-shaped structures, and the second side extends in the same direction. The fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm share the first side of the L-shaped structure.

[0155] Among them, the second sides of the third and fourth low-frequency oscillator arms extend in opposite directions, such as... Figure 6 As shown, the second side of the third low-frequency oscillator arm extends in the +y direction, and the second side of the fourth low-frequency oscillator arm extends in the -y direction.

[0156] The second sides of the fifth and sixth high-frequency oscillator arms extend in opposite directions, as shown below. Figure 6 As shown, the second side of the fifth high-frequency oscillator arm extends in the +y direction, and the second side of the sixth high-frequency oscillator arm extends in the -y direction.

[0157] The vibrator arm adopts an L-shaped structure, and the two parallel vibrator arms share the first side of the L-shaped structure, which can reduce the space occupied by the parallel vibrator, save more space, and compared with the wiring of a single-frequency vibrator, no additional wiring is required, which reduces the wiring difficulty, simplifies the manufacturing process, and reduces production costs.

[0158] in, Figure 15 and Figure 14 The difference is that, Figure 14 Each radiating unit in the structure is an axisymmetric structure. Figure 15 Each radiating unit in the structure is a centrosymmetric structure.

[0159] Figure 16 and Figure 14 The difference is that, Figure 14 In the first and third radiating units, the high-frequency and low-frequency oscillators are connected to the same end of the first side of the L-shaped structure. Figure 16 In the first and third radiating units, the high-frequency oscillator and the low-frequency oscillator are connected to different ends of the first side of the L-shaped structure. For example, the high-frequency oscillator in the first and third radiating units is connected to one end of the first side of the L-shaped structure, and the low-frequency oscillator is connected to the other end of the first side of the L-shaped structure.

[0160] Figure 17 and Figure 16 The difference is that, Figure 16 Each radiating unit in the structure is an axisymmetric structure. Figure 17 Each radiating unit in the structure is a centrosymmetric structure.

[0161] In this application, Figure 5 ,Figure 14 、 Figure 15 、 Figure 16 As shown in the double-frequency antenna, the shape and symmetry relationship of the dipole arm are only for example, and other shapes and symmetry relationships of the dipole arm are also within the protection scope of the present application.

[0162] Figure 18 The radiation pattern of the double-frequency antenna provided by the embodiment of the present application in the first frequency band is shown in the figure. Figure 18 As shown in the figure, the double-frequency antenna has good omnidirectional pattern in the 5G frequency band, i.e. the band of high-frequency signals.

[0163] Figure 19 The radiation pattern of the double-frequency antenna provided by the embodiment of the present application in the second frequency band is shown in the figure. Figure 19 As shown in the figure, the double-frequency antenna has good omnidirectional pattern in the 2.4G frequency band, i.e. the band of low-frequency signals.

[0164] As shown in the figure, Figure 18 、 Figure 19 The double-frequency antenna is an omnidirectional antenna, and the high-frequency pattern and the low-frequency pattern are regular in shape, which indicates that the isolation between the two is high, and the mutual interference is small.

[0165] The present application provides a double-frequency antenna, which comprises a feeding unit, a circuit board, and a first radiation unit, a second radiation unit, a third radiation unit and a transmission line arranged on the first surface of the circuit board. The first radiation unit, the second radiation unit and the third radiation unit are arranged in the first direction on the first surface in sequence and are connected in series through the transmission line. The first radiation unit is also connected with the feeding unit through the transmission line, and the feeding unit is used for transmitting or receiving signals through the transmission line. Wherein, the multiple radiation units are arranged on the same surface of the circuit board, only single-sided wiring and welding are needed, which reduces the wiring difficulty, simplifies the manufacturing process and reduces the production cost. The first radiation unit comprises a first high-frequency dipole and a first low-frequency dipole connected in parallel; the second radiation unit comprises a second high-frequency dipole; the third radiation unit comprises a third high-frequency dipole and a second low-frequency dipole connected in parallel; the working frequency band of the first high-frequency dipole, the second high-frequency dipole and the third high-frequency dipole is the first frequency band, and the working frequency band of the first low-frequency dipole and the second low-frequency dipole is the second frequency band. Thus, in the first radiation unit and the third radiation unit, the high-frequency dipole and the low-frequency dipole are connected in parallel, which saves more space. In addition, only one transmission line is needed to connect the feeding unit and the multiple radiation units, which reduces the welding points and the risk of short circuit. The double-frequency antenna realizes the concurrent of 2.4G and 5G two frequency bands, and the standing wave impedance meets the requirement of-10dB.

[0166] ​​​​Based on the same technical concept, the application further provides a communication device, which comprises a shell, a control circuit and the dual-frequency antenna.

[0167] The control circuit is used for processing signals, and the dual-frequency antenna is used for transmitting signals. Specifically, the dual-frequency antenna can transmit signals processed by the control circuit, or the control circuit receives signals received by the dual-frequency antenna and processes the signals. Since the dual-frequency antenna has high isolation and high gain, the communication effect of the communication device is good.

[0168] In specific embodiments, the specific type of the communication device is not limited. For example, the communication device can be a router or a set-top box, etc., and is mainly a WiFi communication device.

[0169] Based on the same technical concept, the application further provides a chip, which comprises a control circuit and the dual-frequency antenna in any of the technical solutions. The dual-frequency antenna is electrically connected with the control circuit. Specifically, the control circuit and the dual-frequency antenna can form a packaging structure, so as to simplify the installation process of the chip. The control circuit is used for processing signals, and the dual-frequency antenna is used for transmitting input and output signals of the control circuit. Specifically, the dual-frequency antenna can transmit signals processed by the control circuit, or the control circuit receives signals received by the dual-frequency antenna and processes the signals. Since the dual-frequency antenna has high isolation and high gain, the communication effect of the chip is good.

[0170] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any change or replacement within the technical scope disclosed in the application should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A dual frequency antenna, characterized by The application relates to an antenna, which comprises: a circuit board, a first radiation unit, a second radiation unit, a third radiation unit, a transmission line and a feeding unit; the circuit board comprises a first surface and a second surface facing away from each other; the first radiation unit, the second radiation unit and the third radiation unit are arranged in sequence along a first direction on the first surface, the first radiation unit, the second radiation unit and the third radiation unit are connected in series through the transmission line, the first radiation unit is connected with the feeding unit through the transmission line, and the feeding unit is used for transmitting or receiving signals through the transmission line; the first radiation unit comprises a first high-frequency oscillator and a first low-frequency oscillator connected in parallel; the second radiation unit comprises a second high-frequency oscillator; the third radiation unit comprises a third high-frequency oscillator and a second low-frequency oscillator connected in parallel; the working frequency range of the first low-frequency oscillator and the second low-frequency oscillator is a first frequency range, and the working frequency range of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator is a second frequency range.

2. The dual-band antenna according to claim 1, characterized in that The length l1 of the vibrator arm of the first low-frequency vibrator and the second low-frequency vibrator satisfies: Wherein, λ1 is the wavelength of the first frequency band electromagnetic wave, and A1 is an error threshold value. The length l2 of the vibrator arm of the first high-frequency vibrator, the second high-frequency vibrator and the third high-frequency vibrator satisfies: Wherein, λ2 is the wavelength of the first frequency band electromagnetic wave, A2 is an error threshold.

3. The dual-band antenna according to claim 1 or 2, characterized in that, The distance d between the first low-frequency oscillator and the second low-frequency oscillator satisfies the condition |d-λ1|<=A3, wherein λ1 is the wavelength of the electromagnetic wave in the first frequency range, and A3 is an error threshold value; The distance between the first high-frequency oscillator and the second high-frequency oscillator and the distance between the second high-frequency oscillator and the third high-frequency oscillator satisfy the condition |D-λ2|<=A4, wherein λ2 is the wavelength of the electromagnetic wave in the second frequency range, and A4 is an error threshold value.

4. The dual-band antenna according to any one of claims 1-3, characterized in that, The first low-frequency oscillator comprises a first low-frequency oscillator arm and a second low-frequency oscillator arm arranged along the first direction; The first high-frequency oscillator comprises a first high-frequency oscillator arm and a second high-frequency oscillator arm arranged along the first direction; The first low-frequency oscillator arm and the first high-frequency oscillator arm are connected in parallel, and the second low-frequency oscillator arm and the second high-frequency oscillator arm are connected in parallel; The second high-frequency oscillator comprises a third high-frequency oscillator arm and a fourth high-frequency oscillator arm arranged along the first direction; The second low-frequency oscillator comprises a third low-frequency oscillator arm and a fourth low-frequency oscillator arm arranged along the first direction; The third high-frequency oscillator comprises a fifth high-frequency oscillator arm and a sixth high-frequency oscillator arm arranged along the first direction; The third low-frequency oscillator arm and the fifth high-frequency oscillator arm are connected in parallel, and the fourth low-frequency oscillator arm and the sixth high-frequency oscillator arm are connected in parallel.

5. The dual-band antenna according to claim 4, wherein, The oscillator arms are all U-shaped structures, wherein two oscillator arms connected in parallel share the bottom edge of the U-shaped structure, the opening directions of the two oscillator arms connected in parallel are the same, and the opening directions of the two oscillator arms in the same oscillator arm face away from each other.

6. The dual-band antenna according to claim 4, wherein, The oscillator arms are all L-shaped structures, wherein two oscillator arms connected in parallel share the bottom edge of the L-shaped structure.

7. The dual-band antenna according to claim 5 or 6, characterized in that, The first radiating unit comprises a coupling branch, the second radiating unit comprises a grounding point, the third radiating unit comprises a feeding point, the transmission line comprises a first sub-transmission line, a second sub-transmission line and a third sub-transmission line, the coupling branch is coupled with the first sub-transmission line, the feeding point is connected with the second sub-transmission line, the grounding point is connected with the third sub-transmission line, and the first sub-transmission line is connected through the third sub-transmission line and the second sub-transmission line.

8. The dual-band antenna according to claim 7, characterized in that, The coupling branch is U-shaped, and openings are respectively arranged on the bottom edges of the first high-frequency vibrator arm and the first low-frequency vibrator arm, both ends of the coupling branch are connected with both ends of the openings respectively, and the coupling branch is arranged around the first sub-transmission line.

9. The dual-band antenna according to claim 7 or 8, characterized in that, The fourth low-frequency vibrator arm and the sixth high-frequency vibrator arm are connected with the second sub-transmission line.

10. The dual-band antenna according to any one of claims 7-9, characterized in that, The first sub-transmission line and the second sub-transmission line are first-type transmission lines, and the first-type transmission line comprises a first inner conductor and an insulating layer, and the insulating layer is arranged between the inner conductor and the circuit board.

11. The dual-band antenna according to claim 10, wherein, The first-type transmission line further comprises a conductive sheet, the conductive sheet is arranged on the side of the insulating layer away from the circuit board, and the conductive sheet is connected with the inner conductor.

12. The dual-band antenna according to any one of claims 7-11, characterized in that, The third sub-transmission line is a second-type transmission line, and the second-type transmission line comprises a second inner conductor, an outer conductor and a first dielectric layer, the second inner conductor and the outer conductor are coaxial, and the first dielectric layer is arranged between the second inner conductor and the outer conductor.

13. The dual-band antenna according to claim 12, wherein, The transmission line further comprises a fourth sub-transmission line, the first radiating unit is connected with the feeding unit through the fourth sub-transmission line, and the fourth sub-transmission line is the second-type transmission line.

14. The dual-band antenna according to claim 13, wherein, The transmission line further comprises a fifth sub-transmission line, a sixth sub-transmission line and a seventh sub-transmission line, the fourth sub-transmission line is connected with the first sub-transmission line through the fifth sub-transmission line, the first sub-transmission line is connected with the third sub-transmission line through the sixth sub-transmission line, and the third sub-transmission line is connected with the second sub-transmission line through the seventh sub-transmission line, wherein the fifth sub-transmission line, the sixth sub-transmission line and the seventh sub-transmission line are third-type transmission lines, the third-type transmission line comprises a third inner conductor and a second dielectric layer, the third inner conductor and the second dielectric layer are coaxial, and the second dielectric layer is arranged outside the third inner conductor.

15. The dual-band antenna according to any one of claims 1-14, wherein, The first frequency band is a 2.4 GHz frequency band, and the second frequency band is a 5 GHz frequency band.

16. The dual-band antenna according to any one of claims 1-15, wherein, The vibrators of the first radiating unit, the second radiating unit and the third radiating unit are axisymmetric structures or central symmetric structures.

17. A communication device, characterized by The communication device comprises a shell, a control circuit and a dual-frequency antenna as claimed in any one of claims 1-16, the control circuit and the dual-frequency antenna are arranged in the shell, and the control circuit and the dual-frequency antenna are electrically connected.

18. The communication device of claim 17, wherein, The communication device is a router.

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