Dual-frequency antenna and communication equipment

Abstract

The invention provides a dual-frequency antenna and communication equipment. The dual-frequency antenna comprises a feed unit, a circuit board, and a first radiation unit, a second radiation unit, a third radiation unit and a transmission line which are arranged on the first surface of the circuit board, the first radiation unit, the second radiation unit and the third radiation unit are sequentially arranged on the first surface in the first direction and are connected in series through the transmission line, the first radiation unit is further connected with the feed unit through the transmission line, and the feed 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 which are 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 which are 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 first frequency bands, and the working frequency bands of the first low-frequency oscillator and the second low-frequency oscillator are second frequency bands.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular, to a dual-frequency antenna and communication equipment. Background Art

[0002] Compared with mobile networks, Wireless Fidelity (Wi-Fi) technology, which uses unlicensed wireless spectrum, has an inherent low-cost advantage. As Wi-Fi signal rates increase and become more popular, the number of Wi-Fi devices is growing.

[0003] As the requirements for Wi-Fi signal rates are getting higher and higher, the transmission rate of the antenna 2.4G frequency band can no longer meet market demand. Therefore, dual-band antennas that combine the 2.4G frequency band and the 5G frequency band are promoted. The dual-band antenna includes a low-frequency oscillator for transmitting 2.4G signals and a high-frequency oscillator for transmitting 5G signals.

[0004] Under the premise of keeping the size of the whole device unchanged, how to control the number of antennas becomes increasingly important. Figure 1 In the dual-frequency dual-feed antenna shown, the high-frequency oscillator 30 and the low-frequency oscillator 20 are respectively located on the front and back sides of the circuit board 10, arranged back to back, and both are series-fed array antennas. The radiating units are connected by coaxial cables to achieve high gain and horizontal coverage. There are two independent feeding ports. However, the circuit board needs to be welded with cables, and the solder joints are numerous and dense, which is easy to short-circuit, and the process is complicated and the cost is high. Summary of the invention

[0005] The embodiments of the present application provide a dual-frequency antenna and communication equipment, which solve the problems of the dual-frequency dual-feed antenna having many solder joints, easy short circuit, complex process and high cost.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] In a first aspect, a dual-frequency antenna is provided, comprising: 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 which are opposite to each other; the first radiation unit, the second radiation unit and the third radiation unit are arranged in sequence on the first surface along a first direction, 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 also connected to the feeding unit through the transmission line, and the feeding unit is used to transmit or receive signals through the transmission line; wherein 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 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, and the operating frequency band of the first low-frequency oscillator and the second low-frequency oscillator is a second frequency band. Thus, multiple radiation units are arranged on the same surface of the circuit board, and in some radiation units, such as the first radiation unit and the third radiation unit, the high-frequency oscillator and the low-frequency oscillator can be connected in parallel, which saves more space and only requires single-sided routing and welding, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces production costs. In addition, only one transmission line is needed to connect the feed unit and multiple radiation units in series, which reduces solder joints and reduces the risk of short circuits.

[0008] In an optional implementation, the first radiation unit, the second radiation unit and the third radiation unit are all centrosymmetric structures or axisymmetric structures. Therefore, the first radiation unit, the second radiation unit and the third radiation unit adopt a centrosymmetric structure or an axisymmetric structure, and the dipole arms of each dipole are symmetrically arranged, and the symmetry axis passes through the center between the dipole arms, and the center is also the center of the radiation unit, and the dipole of the dual-frequency antenna can be a dipole dipole.

[0009] In an optional implementation, the first low-frequency vibrator includes: a first low-frequency vibrator arm and a second low-frequency vibrator arm arranged along the first direction; the first high-frequency vibrator includes: a first high-frequency vibrator arm and a second high-frequency vibrator arm arranged along the first direction; the first low-frequency vibrator arm and the first high-frequency vibrator arm are connected in parallel, and the second low-frequency vibrator arm and the second low-frequency vibrator arm are connected in parallel; the second high-frequency vibrator includes: a third high-frequency vibrator arm and a fourth high-frequency vibrator arm arranged along the first direction; the second low-frequency vibrator includes: a third low-frequency vibrator arm and a fourth low-frequency vibrator arm arranged along the first direction; the third high-frequency vibrator includes: a fifth high-frequency vibrator arm and a sixth high-frequency vibrator arm arranged along the first direction; 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. Therefore, 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 optional implementation, the vibrator arms are all U-shaped structures, wherein the two parallel vibrator arms share the bottom edge of the U-shaped structure, and the opening directions of the two parallel vibrator arms are the same, and the opening directions of the two vibrator arms in the same vibrator are opposite. Thus, the vibrator arms adopt a U-shaped structure, and the two parallel vibrator arms share the bottom edge of the U-shaped structure, which can reduce the size of the space occupied by the parallel vibrator, save more space, and compared with the routing of a single-frequency vibrator, no additional routing is required, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces production costs.

[0011] In an optional implementation, the length l1 of the vibrator arms of the first low-frequency vibrator and the second low-frequency vibrator satisfies: Wherein, λ1 is the wavelength of the electromagnetic wave in the first frequency band, A1 is the error threshold; the length l2 of the vibrator arms 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 electromagnetic wave in the first frequency band, and A2 is the error threshold. Thus, the physical length corresponding to the electrical length of the first low-frequency vibrator and the second low-frequency vibrator is close to one-quarter of the wavelength of the first frequency band, and the electromagnetic wave with a frequency in the first frequency band can be transmitted or received. The physical length corresponding to the vibrator arms of the first high-frequency vibrator, the second high-frequency vibrator, and the third high-frequency vibrator is close to one-quarter of the wavelength of the second frequency band, and the electromagnetic wave with a frequency in the second frequency band can be transmitted or received.

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

[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, 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. 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, thereby coupling and feeding the first radiation unit through the transmission line, directly feeding the third radiation unit with a signal, and feeding the second radiation unit through the ground current, taking into account the low frequency while improving the high frequency gain.

[0014] In an optional implementation, the first low-frequency dipole arm and the first high-frequency dipole arm are coupled to the first sub-transmission line, and the fourth low-frequency dipole arm and the sixth high-frequency dipole arm are connected to the second sub-transmission line. Thus, the first sub-transmission line couples and feeds the first low-frequency dipole arm and the first high-frequency dipole arm through coupling, and the second sub-transmission line directly feeds the fourth low-frequency dipole arm and the sixth high-frequency dipole arm.

[0015] In an optional implementation, the coupling branch is U-shaped, the bottom edges of the first high-frequency dipole arm and the first low-frequency dipole arm are provided with openings, the two ends of the coupling branch are respectively connected to the two ends of the openings, and the coupling branch is arranged around the first sub-transmission line. Thus, the coupling size between the coupling branch and the first sub-transmission line is larger, and the coupling effect between 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. Thus, the first-type transmission line can directly feed power to the radiation unit.

[0017] In an optional implementation, the first type transmission line further includes: an insulating layer, the insulating layer being located between the inner conductor and the circuit board. Thus, by providing 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, the conductive sheet is located on a side of the insulating layer away from the circuit board, and the conductive sheet is connected to the inner conductor. Thus, by providing the conductive sheet, the manufacturing process 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 transmission line, and the second-type transmission line includes: an inner conductor, an outer conductor, and a dielectric layer, the inner conductor and the outer conductor are coaxial, and the dielectric layer is located between the inner conductor and the outer conductor. Thus, the outer conductor of the second-type transmission line contacts the circuit board and can be grounded.

[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 is connected to the feed unit through the fourth sub-transmission line, and the fourth sub-transmission line is the second type transmission line. Thus, the second type transmission line can be used to connect the feed unit and multiple 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 is connected to the first sub-transmission line through the fifth sub-transmission line, the first sub-transmission line is connected to the third sub-transmission line through the sixth sub-transmission line, and the third sub-transmission line is 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 transmission lines, and the third-type transmission line includes: an inner conductor and a dielectric layer, the inner conductor and the dielectric layer are coaxial, and the dielectric layer is located outside the inner conductor. Thus, the third-type transmission line can be used to connect the first-type transmission and the second-type transmission line. The cross-sectional dimensions of the first-type transmission line, the third-type transmission line and the second-type transmission line increase successively. By setting the third-type transmission line, the transition between the first-type transmission line and the second-type transmission line can be made smoother and more coherent, thereby improving the stability of signal transmission.

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

[0024] In a second aspect, a communication device is provided, comprising a housing, a control circuit and the dual-frequency antenna as described above, wherein the control circuit and the dual-frequency antenna are arranged in the housing, and the control circuit and the dual-frequency antenna are electrically connected. Thus, the communication device adopts the dual-frequency antenna as described above, achieves high gain, saves more space, has low wiring difficulty, and reduces production costs.

[0025] In an optional implementation, the communication device is a router. Therefore, the dual-frequency antenna can be used in the router, thereby improving the communication effect.

[0026] The present application provides a dual-frequency antenna and a communication device, the dual-frequency antenna comprising: 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 on the first surface in sequence along the first direction and connected in series through the transmission line, the first radiation unit is also connected to the feeding unit through the transmission line, and the feeding unit is used to transmit or receive signals through the transmission line. Wherein, multiple radiation units are arranged on the same surface of the circuit board, and only single-sided routing and welding are required, which reduces the routing difficulty, simplifies the manufacturing process, and reduces the production cost. The first radiation unit comprises: a first high-frequency oscillator and a first low-frequency oscillator 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 in parallel; the working frequency band of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator is the first frequency band, and the working frequency band of the first low-frequency oscillator and the second low-frequency oscillator is the second frequency band. Thus, in the first radiation unit and the third radiation unit, the high-frequency oscillator and the low-frequency oscillator are connected in parallel, which saves more space. In addition, only one transmission line is needed to connect the feeding unit and multiple radiation units in series, which reduces solder joints and reduces the risk of short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a dual-frequency dual-feed antenna;

[0028] Figure 2 for Figure 1 A schematic structural diagram of a first surface of a dual-frequency dual-feed antenna;

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

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

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

[0032] Figure 6 for Figure 4 A schematic structural diagram of the first radiation unit;

[0033] Figure 7 for Figure 4 A schematic diagram of the structure of the second radiation unit;

[0034] Figure 8 for Figure 4 A schematic diagram of the structure of the third radiation unit;

[0035] Fig. 9 A schematic diagram of the structure of the first type of transmission line provided in an embodiment of the present application;

[0036] Fig.10 A schematic diagram of the structure of the second type of transmission line provided in an embodiment of the present application;

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

[0038] Fig.12 A schematic diagram of the structure of the third type of transmission line provided in an embodiment of the present application;

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

[0040] Fig.14 A schematic structural diagram of a first surface of a second dual-frequency antenna provided in an embodiment of the present application;

[0041] Fig.15 A schematic structural diagram of a first surface of a third dual-frequency antenna provided in an embodiment of the present application;

[0042] Fig.16 A schematic structural diagram of the first surface of a fourth dual-frequency antenna provided in an embodiment of the present application;

[0043] Fig.17 A schematic diagram of the structure of the first surface of the fifth dual-frequency antenna provided in an embodiment of the present application

[0044] Fig.18 A schematic diagram of the radiation pattern of the dual-frequency antenna provided in an embodiment of the present application in the first frequency band;

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

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

[0047] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0048] In addition, in the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components in the drawings.

[0049] The following explains the terms that may appear in the embodiments of the present application.

[0050] Dipole antenna: It is composed of a pair of symmetrically placed conductors, with the two ends of the conductors close to each other connected to the feeder. 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 antenna transceiver and the radiator. Transmission line can directly transmit current waves or electromagnetic waves depending on the frequency and form. The connection point on the radiator where the transmission line is connected is usually called the feeding point. Transmission lines include wire transmission lines, coaxial transmission lines, waveguides, or microstrip lines. Depending on the implementation form, the transmission line can include a bracket antenna body, a glass antenna body, etc. Depending on the carrier, the transmission line can be implemented by LCP (Liquid Crystal Polymer), FPC (Flexible Printed Circuit), or PCB (Printed Circuit Board).

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

[0053] Any of the above-mentioned grounding layers, grounding plates, or grounding metal layers are made of conductive materials. In one embodiment, the conductive material can be any of the following materials: copper, aluminum, stainless steel, brass and their alloys, 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 and tin-plated copper on an insulating substrate, cloth impregnated with graphite powder, graphite-coated substrates, copper-plated substrates, brass-plated substrates, and aluminum-plated substrates. It will be appreciated by those skilled in the art that the grounding layer / grounding plate / grounding metal layer can also be made of other conductive materials.

[0054] Connected / connected: can refer to a mechanical connection relationship or a physical connection relationship, that is, A and B are connected or A and B are connected, which can mean that there is a fastening component (such as screws, bolts, rivets, 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 "coupled connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be called "electrical connection", which is understood as the physical contact and electrical conduction between components; it can also be understood as the connection between different components in the circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals; "indirect coupling" can be understood as two conductors being electrically conductive in an airless / non-contact manner. In one embodiment, indirect coupling can also be called capacitive coupling, for example, signal transmission is achieved by coupling between the gaps between two conductive parts to form an equivalent capacitor.

[0056] The above-mentioned “electrical connection” or “indirect coupling” method enables two or more components to be conductive or connected to each other to transmit signals or energy.

[0057] Figure 1 FIG. 1 is a schematic diagram of a side structure of a dual-frequency dual-feed antenna. Figure 1As shown, the dual-frequency dual-feed antenna includes a printed circuit board (PCB) 10, and the printed circuit board 10 includes a first surface 11 and a second surface 12 that are separated 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 sequentially arranged on the first surface 11 along a first direction y, and the at least three high-frequency vibrators 30 are sequentially arranged on the second surface 12 along a first direction y, and the first direction y can be the extension direction of the antenna. In other words, the low-frequency vibrators 20 and the high-frequency vibrators 30 are respectively arranged on the two side surfaces of the printed circuit board 10 of the dual-frequency dual-feed antenna.

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

[0059] In one embodiment, a metal layer may be provided on the printed circuit board 10. The metal layer may be used for grounding electronic components carried on the printed circuit board 10, and may also be used for grounding other components, such as a bracket antenna, a frame antenna, etc. The metal layer may be called a floor, a grounding plate, or a grounding layer. In one embodiment, the metal layer may be formed by etching metal on the surface of any dielectric plate in the printed circuit board 10. In one embodiment, the edge of the printed circuit board 10 may be regarded as the edge of its grounding layer.

[0060] Figure 2 for Figure 1 The schematic diagram of the structure of the first surface of the dual-frequency dual-feed antenna is as follows: Figure 1 and Figure 2As shown, the first surface 11 of the printed circuit board 10 is sequentially provided with the first low-frequency dipole element 21, the second low-frequency dipole element 22, ... the nth low-frequency dipole element along the first direction y, wherein n is a positive integer of at least 2. Adjacent low-frequency dipole elements 20 are electrically connected via the first transmission line 1, that is, the first low-frequency dipole element 21 is electrically connected to the second low-frequency dipole element 22 via the first transmission line 1, and the n-1th low-frequency dipole element is electrically connected to the nth low-frequency dipole element via another first transmission line 1. All low-frequency dipole elements 20 are connected in sequence, and adjacent low-frequency dipole elements 20 are electrically connected via a first transmission line 1. Specifically, when the antenna includes n low-frequency dipole elements 20, n-1 first transmission lines 1 are included. The first low-frequency dipole oscillator 21 is located at the feeding end, and the first low-frequency dipole oscillator 21 is electrically connected to the first feeder 3. Specifically, the first transmission line 1 is electrically connected to the first feeder 3 through the first low-frequency dipole oscillator 21 to achieve signal transmission.

[0061] Figure 3 for Figure 1 The schematic diagram of the structure of the second surface of the dual-frequency dual-feed antenna is as follows: Figure 1 and Figure 3 As shown, the second surface 12 of the printed circuit board 10 is sequentially provided with the first high-frequency dipole element 31, the second high-frequency dipole element 32, the third high-frequency dipole element 33 ... the mth high-frequency dipole element along the first direction y, wherein m is a positive integer of at least 3. Adjacent high-frequency dipole elements 30 are electrically connected via the second transmission line 2, that is, the first high-frequency dipole element 31 is electrically connected to the second high-frequency dipole element 32 via the second transmission line 2, and the m-1th high-frequency dipole element is electrically connected to the mth high-frequency dipole element via another second transmission line 2. All high-frequency dipole elements 30 are connected in sequence, and adjacent high-frequency dipole elements 30 are electrically connected via one second transmission line 2. Specifically, when the antenna includes m high-frequency dipole elements 2, m-1 second transmission lines 2 are included. The first high-frequency dipole oscillator 31 is located at the feeding end, one end of the first high-frequency dipole oscillator 31 is electrically connected to the second transmission line 2, and the other end is electrically connected to the second feeder 4. Specifically, the second feeder 4 and the second transmission line 2 are electrically connected through the first high-frequency dipole oscillator 31 to realize signal transmission.

[0062] The high-frequency antenna and low-frequency antenna of the dual-frequency dual-feed antenna are located on the front and back of the circuit board, respectively, in a back-to-back layout. Both are series-fed array antennas. The radiating units are connected by coaxial cables to achieve high gain and horizontal coverage. There are two independent feeding ports. However, the circuit board needs to be welded with cables, and the solder joints are numerous and dense, which is easy to short-circuit. The process is complicated and the cost is high.

[0063] To this end, an embodiment of the present application provides an improved antenna.

[0064] Figure 4 This is a schematic diagram of the structure of a dual-frequency antenna provided by an embodiment of the present application. Figure 4 As shown, the dual-frequency dual-feed antenna includes a printed circuit board 10, and the printed circuit board 10 includes a first surface 11 and a second surface 12 that are separated from each other. Three radiation units 200 are arranged on the first surface 11: 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 on the first surface 11 along the first direction y.

[0065] Adjacent radiating units are electrically connected via a transmission line 300, that is, the first radiating unit 201 is electrically connected to the second radiating unit 202 via a transmission line 300, and the n-1 th radiating unit is electrically connected to the n th radiating unit via another transmission line 300. All radiating units are connected in sequence, and adjacent radiating units are electrically connected via a transmission line 300. Specifically, when the antenna includes n radiating units, it includes n-1 transmission lines 300. The first radiating unit 201 is located at the feeding end, and the first radiating unit 201 is electrically connected to the feeding unit via a transmission line to achieve signal transmission.

[0066] The feed unit is a combination of all components of the antenna for the purpose of receiving and transmitting radio frequency waves. In the case of a receiving antenna, the feed unit can be considered as the part of the antenna 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 understood in a narrow sense as an RF chip, or a transmission path including an RF chip to a radiator or a feeding point on a transmission line. The feed unit has the function of converting radio waves into electrical signals and sending them to the receiver component. Generally, it is considered to be a part of the antenna that converts radio waves into electrical signals and vice versa. The antenna should be designed with maximum power transfer possibilities and efficiency in mind. To do this, 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 transfer conditions, the two impedances (load resistance and feed impedance) should be matched. Matching can be done by considering frequency requirements and design parameters of the antenna such as gain, directivity and radiation efficiency.

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

[0068] In some embodiments, the working frequency band of the first low-frequency oscillator 2012 and the second low-frequency oscillator 2032 is the first frequency band, and the working frequency band of the first high-frequency oscillator 2011, the second high-frequency oscillator 2021 and the third high-frequency oscillator 2031 is the 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 dimension of the first surface 11 of the circuit board in the y direction is 132 mm, and the dimension in the x direction is 13 mm. The overall dimension is relatively small, which is beneficial to reducing the size of the entire device.

[0070] The dual-band antenna provided in the present application includes two low-frequency oscillators operating in the 2.4 GHz frequency band and three high-frequency oscillators operating in the 5 GHz frequency band, thereby improving the combined gain.

[0071] The dual-band antenna provided in the present application arranges multiple radiating units on the same surface of a circuit board. In some radiating units, the high-frequency oscillator and the low-frequency oscillator can be connected in parallel, which saves more space and only requires single-sided routing and welding, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces production costs.

[0072] In addition, only one transmission line 300 is needed to connect the feeding unit and multiple radiation units in series, thereby reducing solder joints and lowering the risk of short circuit.

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

[0074] Combine the following Figure 5-Figure 8 The structure of the dual-band antenna of the present application is described.

[0075] In some embodiments, the first radiation unit 201, the second radiation unit 202 and the third radiation unit 203 adopt a centrally symmetrical structure or an axially symmetrical structure, then the dipole arms in each radiation unit are symmetrically arranged, and the symmetry axis passes through the center between the dipole arms, and the center is also the center of the radiation unit, then the dipole of the dual-band antenna can be a dipole dipole.

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

[0077] Combine the following Figure 6 right Figure 5The structure of the first radiation unit 201 in FIG. Figure 6 As shown, the first high-frequency vibrator includes: a first high-frequency vibrator arm 2011a and a second high-frequency vibrator arm 2011b arranged along a first direction.

[0078] The first low-frequency dipole oscillator includes: a first low-frequency dipole arm 2012a and a second low-frequency dipole arm 2012b arranged along a first direction.

[0079] The first high-frequency dipole arm 2011 a is connected in parallel with the first low-frequency dipole arm 2012 a , and the second high-frequency dipole arm 2011 b is connected in parallel with the second low-frequency dipole arm 2012 b .

[0080] The first high-frequency dipole arm 2011a and the first low-frequency dipole arm 2012a are both U-shaped structures with the same opening direction. The first high-frequency dipole arm 2011a and the first low-frequency dipole arm 2012a share the bottom edge of the “U”-shaped structure.

[0081] The second high-frequency dipole arm 2011b and the second low-frequency dipole arm 2012b are both U-shaped structures with the same opening direction. The second high-frequency dipole arm 2011b and the second low-frequency dipole arm 2012b share the bottom edge of the “U”-shaped structure.

[0082] The opening directions of the first high-frequency dipole arm 2011a and the second high-frequency dipole arm 2011b are opposite. Figure 6 As shown, the opening direction of the first high-frequency dipole arm 2011a is the +y direction, and the opening direction of the second high-frequency dipole arm 2011b is the -y direction.

[0083] The opening directions of the first low-frequency dipole arm 2012a and the second low-frequency dipole arm 2012b are opposite. Figure 6 As shown, the opening direction of the first low-frequency dipole arm 2012a is the +y direction, and the opening direction of the second low-frequency dipole arm 2012b is the -y direction.

[0084] Therefore, the vibrator arm adopts a 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 vibrators and save more space. Compared with the routing of single-frequency vibrators, no additional routing is required, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces production costs.

[0085] Next reference Figure 5 The second radiation unit 202 includes: a second high-frequency oscillator 2021.

[0086] In some embodiments, the second radiation unit is a dipole radiation unit, wherein the second high-frequency oscillator 2021 is a dipole oscillator. Figure 5 As shown, the second radiation unit 202 includes: a second high-frequency oscillator 2021.

[0087] Combine the following Figure 7 right Figure 5 The structure of the second radiation unit 202 is further described. Figure 7 As shown, the second high-frequency vibrator 2021 includes: a third high-frequency vibrator arm 2021a and a fourth high-frequency vibrator arm 2021b arranged along the first direction.

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

[0089] The third radiation 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 radiation unit 203 is a dipole antenna, wherein the third high-frequency oscillator 2031 and the second low-frequency oscillator 2032 are both dipole oscillators. Figure 5 As shown, the third radiation unit 203 includes: a third high-frequency oscillator 2031 and a second low-frequency oscillator 2032 connected in parallel.

[0091] Combine the following Figure 8 right Figure 5 The structure of the third radiation unit 203 is further described. Figure 8 As shown, the second low-frequency vibrator 2032 includes: a third low-frequency vibrator arm 2032a and a fourth low-frequency vibrator arm 2032b arranged along the first direction.

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

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

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

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

[0096] The opening directions of the third low-frequency dipole arm 2032a and the fourth low-frequency dipole arm 2032b are opposite. Figure 6 As shown, the opening direction of the third low-frequency dipole arm 2032a is the +y direction, and the opening direction of the fourth low-frequency dipole arm 2032b is the -y direction.

[0097] The opening directions of the fifth high-frequency dipole arm 2031a and the sixth high-frequency dipole arm 2031b are opposite. Figure 6 As shown, the opening direction of the fifth high-frequency dipole arm 2031 a is the +y direction, and the opening direction of the sixth high-frequency dipole arm 2031 b is the −y direction.

[0098] The vibrator arm adopts a 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 vibrators and save more space. Compared with the routing of single-frequency vibrators, no additional routing is required, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces production costs.

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

[0100] Therefore, the physical length corresponding to the electrical length of the first low-frequency oscillator 2012 and the second low-frequency oscillator 2032 is close to one quarter of the wavelength of the first frequency band, and thus electromagnetic waves with a frequency in the first frequency band can be emitted or received.

[0101] In some embodiments of the present application, the length l2 of the vibrator arms 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 electromagnetic wave in the first frequency band, and A2 is the error threshold. In some embodiments, A2 is approximately

[0102] Therefore, the physical lengths of the vibrator arms of the first high-frequency vibrator 2011, the second high-frequency vibrator 2021 and the third high-frequency vibrator 2031 are close to one quarter of the wavelength of the second frequency band, and thus electromagnetic waves with a frequency in the second frequency band can be emitted or received.

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

[0104] In some embodiments of the present application, the distance between the first high-frequency oscillator 2011 and the second high-frequency oscillator 2021, and the distance 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 electromagnetic wave in the second frequency band, and A4 is the error threshold. In some embodiments, A4 is approximately

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

[0106] Combine the following Figure 5-Figure 13 The structure of the transmission line 300 will be described.

[0107] In some embodiments, Figure 5 As shown, the first radiation unit 201 includes: a coupling branch 2013, the second radiation unit 202 includes: a grounding point, the third radiation unit 203 includes: a feeding point, 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 branch 2013 is coupled to the first sub-transmission line 301, the feeding 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, Figure 5 As shown, the transmission line 300 further 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. Fig. 9 right Figure 5 The structure of the first type of transmission line is described in the following. Fig. 9 As shown, the first type transmission line 31 includes: a first inner conductor 31a.

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

[0111] In some embodiments, the first type transmission line 31 further includes: an insulating layer 31b, the insulating layer 31b is located between the second inner conductor 3021a and the circuit board. Thus, by providing the insulating layer 31b, the second inner conductor 3021b and the circuit board can be separated. In some embodiments, the insulating layer can be an insulating layer of a coaxial cable. The insulating layer can be made of materials such as polypropylene or polyethylene.

[0112] In some embodiments, the first type transmission line 31 further includes: a conductive sheet 31c, the conductive sheet 31c is located on a side of the second inner conductor 3021a away from the insulating layer 31b, and the conductive sheet 31c is 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. Therefore, by providing 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, Figure 5 As shown, the dipole arms of the radiation unit located at two ends of the circuit board are electrically connected to the first type of transmission line.

[0115] For example, the first transmission line 301 is coupled with the oscillator in the first radiation unit 201 which is far away from the second radiation unit 202, that is, Figure 6 As shown, the first low-frequency dipole arm 2012 a and the first high-frequency dipole arm 2011 a are coupled to the first sub-transmission line 301 .

[0116] like Figure 6 As shown, the first low-frequency dipole arm 2012a and the first high-frequency dipole arm 2011a further include a coupling branch 2013, and the coupling branch 2013 is coupled to the first sub-transmission line 301. Thus, the first radiation unit 201 can be coupled and fed through the first sub-transmission line 301.

[0117] The coupling branch 2013 is U-shaped, and the U-shaped bottom edges of the first low-frequency dipole arm 2012a and the first high-frequency dipole arm 2011a are provided with openings, and the two ends of the coupling branch 2013 are respectively connected to the two ends of the openings, and the coupling branch 2013 is arranged around the second sub-transmission line 302.

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

[0119] In some embodiments, the second transmission line 302 is electrically connected to the vibrator of the third radiation unit 203 which is far away from the second radiation unit 202. Figure 8As shown, the fourth low-frequency dipole arm 2032b and the sixth high-frequency dipole arm 2031b are electrically connected to the second sub-transmission line 302. Thus, the third radiation 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] Combine the following Fig.10 , Fig.11 right Figure 5 The structure of the second type of transmission line is described in detail. Fig.10 , Fig.11 As shown, the second type 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 via the third sub-transmission line 303 .

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

[0124] like Figure 5 As shown, the first radiation unit 201 is connected to the second radiation unit 202 through the second sub-transmission line 302, and the second radiation unit 202 is connected to the third radiation unit 203 through the second sub-transmission line 302, and the first radiation unit 201 is also connected to the feeding port through the fourth sub-transmission line 304.

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

[0126] Among them, Figure 5 As shown, the second radiation unit 202 is connected to the first sub-transmission line 301, and 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, an induced current is generated on the printed circuit board 10, and the second radiation unit 202 generates radiation under the action of the induced current of the printed circuit board 10.

[0127] Optionally, in order to make the transition between the first type transmission line 31 and the second type transmission line 32 smoother and more coherent, as shown in FIG. Figure 5 As shown, the transmission line 300 further includes: a fifth sub-transmission line 305 , a sixth sub-transmission line 306 and a 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-type transmission lines.

[0129] Combine the following Fig.12 , Fig.13 right Figure 5 The structure of the second type of transmission line is described in detail. Fig.12 , Fig.13 As shown, the third type transmission line 33 includes: a third inner conductor 33a and a second dielectric layer 33b, the second inner conductor 31a 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) through 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) through 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) through the seventh sub-transmission line 307 (third type transmission line 33).

[0131] See also Figure 5 The third type transmission line 33 can be used to connect the first type transmission line 31 and the second type transmission line 32. The cross-sectional sizes of the first type transmission line 31, the third type transmission line 33 and the second type transmission line 32 increase successively. By setting the third type transmission line 33, the transition between the first type transmission line 31 and the second type transmission line 32 can be made smoother and more coherent, thereby improving the stability of signal transmission.

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

[0133] The outer layer of the third type 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, and at the same time, can separate the first sub-transmission line 301 from the second sub-transmission line 302.

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

[0135] When the dual-frequency antenna is working, 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 coupled and fed to the first radiation unit 201 through the first sub-transmission line 301, and then 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 directly fed to the third radiation unit 203 through the second sub-transmission line 302. The second radiation unit 202 is connected to the third sub-transmission line 303 and can be grounded through the third sub-transmission line 303.

[0136] The embodiment of the present application does not limit the shape of the vibrator arm. In other embodiments, such as Fig.14 , Fig.15 , Fig.16 , Fig.17 As shown, 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] like Fig.14 As shown, the first radiation unit 201 includes a first high-frequency dipole 2011 and a first low-frequency dipole 2012 connected in parallel. The first high-frequency dipole 2011 includes: a first high-frequency dipole arm and a second high-frequency dipole 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 a first direction.

[0139] The first high-frequency dipole arm and the first low-frequency dipole arm are both L-shaped structures, and the first high-frequency dipole arm and the first low-frequency dipole arm share a first side of the L-shaped structure.

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

[0141] Wherein, the second sides of the first high-frequency dipole arm and the second high-frequency dipole arm extend in opposite directions. Fig.14 As shown, the second side of the first high-frequency dipole arm extends in the +y direction, and the second side of the second high-frequency dipole arm extends in the -y direction.

[0142] The second sides of the first low-frequency dipole arm and the second low-frequency dipole arm extend in opposite directions. Fig.14 As shown, the second side of the first low-frequency dipole arm extends in the +y direction, and the second side of the second low-frequency dipole arm extends in the -y direction.

[0143] Therefore, 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 vibrators and save more space. Compared with the routing of single-frequency vibrators, no additional routing is required, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces production costs.

[0144] Next reference Fig.14 The second radiation unit 202 includes: a second high-frequency oscillator 2021.

[0145] In some embodiments, the second radiation unit is a dipole radiation unit, wherein the second high-frequency oscillator 2021 is a dipole oscillator. Fig.14 As shown, the second radiation unit 202 includes: a second high-frequency oscillator 2021.

[0146] like Fig.14 As shown, 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] Among them, the third high-frequency dipole arm and the fourth high-frequency dipole arm are both L-shaped structures, and the second sides extend in opposite directions. The second side of the third high-frequency dipole arm extends in the +y direction, and the second side of the fourth high-frequency dipole arm extends in the -y direction.

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

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

[0150] like Fig.14 As shown, 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 dipole arm is connected in parallel with the fifth high-frequency dipole arm, and the fourth low-frequency dipole arm is connected in parallel with the sixth high-frequency dipole arm.

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

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

[0155] The second sides of the third low-frequency dipole arm and the fourth low-frequency dipole arm extend in opposite directions. Figure 6 As shown, the second side of the third low-frequency dipole arm extends in the +y direction, and the second side of the fourth low-frequency dipole arm extends in the -y direction.

[0156] The second sides of the fifth high-frequency dipole arm and the sixth high-frequency dipole arm extend in opposite directions. Figure 6 As shown, the second side of the fifth high-frequency dipole arm extends in the +y direction, and the second side of the sixth high-frequency dipole 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 vibrators and save more space. Compared with the routing of single-frequency vibrators, no additional routing is required, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces production costs.

[0158] in, Fig.15 and Fig.14 The difference is that Fig.14 Each radiation unit is an axisymmetric structure. Fig.15 Each radiation unit is a centrally symmetrical structure.

[0159] Fig.16 and Fig.14 The difference is that Fig.14 The high-frequency oscillator and the low-frequency oscillator in the first radiation unit and the third radiation unit are connected to the same end of the first side of the L-shaped structure. Fig.16 The high-frequency oscillator and the low-frequency oscillator in the first radiation unit and the third radiation unit are connected to different ends of the first side of the L-shaped structure. For example, the high-frequency oscillator in the first radiation unit and the third radiation unit 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] Fig.17 and Fig.16 The difference is that Fig.16 Each radiation unit is an axisymmetric structure. Fig.17 Each radiation unit is a centrally symmetrical structure.

[0161] In this application, Figure 5 , Fig.14 , Fig.15 , Fig.16 The dual-band antenna shown is only for illustration and does not limit the shape and symmetry of the dipole arms. The dipole arms may also adopt other shapes and symmetry, which all fall within the protection scope of the present application.

[0162] Fig.18 The radiation pattern of the dual-frequency antenna provided in the embodiment of the present application in the first frequency band is shown. Fig.18 As shown, the dual-band antenna has good omnidirectional in-band radiation pattern in the 5G frequency band, that is, the high-frequency signal.

[0163] Fig.19 The radiation pattern of the dual-frequency antenna provided in the embodiment of the present application in the second frequency band is shown. Fig.19 As shown, the dual-band antenna has good omnidirectionality in the 2.4G frequency band, that is, the in-band radiation pattern of the low-frequency signal.

[0164] like Fig.18 , Fig.19 As shown, the dual-frequency antenna is an omnidirectional antenna, and the high-frequency radiation pattern and the low-frequency radiation pattern have regular shapes, indicating that the isolation between the two is high and the mutual interference is small.

[0165] The present application provides a dual-frequency antenna, which includes: a feed 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 on the first surface in sequence along the first direction and connected in series through the transmission line, the first radiation unit is also connected to the feed unit through the transmission line, and the feed unit is used to transmit or receive signals through the transmission line. Wherein, multiple radiation units are arranged on the same surface of the circuit board, and only single-sided routing and welding are required, which reduces the difficulty of routing, simplifies the manufacturing process, and reduces the production cost. The first radiation unit includes: a first high-frequency oscillator and a first low-frequency oscillator in parallel; the second radiation unit includes: a second high-frequency oscillator; the third radiation unit includes: a third high-frequency oscillator and a second low-frequency oscillator in parallel; the working frequency band of the first high-frequency oscillator, the second high-frequency oscillator and the third high-frequency oscillator is the first frequency band, and the working frequency band of the first low-frequency oscillator and the second low-frequency oscillator is the second frequency band. As a result, in the first radiation unit and the third radiation unit, the high-frequency oscillator and the low-frequency oscillator are connected in parallel, which saves more space. In addition, only one transmission line is needed to connect the feed unit and multiple radiation units in series, which reduces the number of solder joints and the risk of short circuit. The dual-band antenna realizes the concurrency of 2.4G and 5G frequency bands, and the standing wave impedance meets the -10dB requirement.

[0166] Based on the same technical concept, the present application also provides a communication device, which includes a housing, a control circuit and the above-mentioned dual-frequency antenna. The above-mentioned dual-frequency antenna and the control circuit are arranged in the above-mentioned housing, and the above-mentioned dual-frequency antenna is electrically connected to the control circuit.

[0167] The control circuit is used to process signals, and the dual-frequency antenna is used to transmit signals. Specifically, the dual-frequency antenna can transmit the signal processed by the control circuit, or the control circuit receives and processes the signal received by the dual-frequency antenna. Since the dual-frequency antenna has a high isolation and a high gain, the communication effect of the communication device is better.

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

[0169] Based on the same technical concept, the present application also provides a chip, which includes a control circuit and a dual-frequency antenna in any of the above technical solutions. The above-mentioned dual-frequency antenna is electrically connected to the control circuit. Specifically, the above-mentioned control circuit and the dual-frequency antenna can form a packaging structure to simplify the installation process of the chip. The above-mentioned control circuit is used to process signals, and the dual-frequency antenna is used to transmit input and output signals of the above-mentioned control circuit. Specifically, the dual-frequency antenna can transmit the signal processed by the control circuit, or the control circuit receives the signal received by the dual-frequency antenna and processes it. Since the isolation of the dual-frequency antenna is high and the gain is also high, the communication effect of the chip is better.

[0170] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A dual-frequency antenna, characterized in that: include: 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 which are opposite to each other; The first radiation unit, the second radiation unit and the third radiation unit are sequentially arranged on the first surface along a first direction, 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 also connected to the feeding unit through the transmission line, and the feeding unit is used to transmit or receive signals through the transmission line; Wherein, the first radiation unit comprises: a first high-frequency oscillator and a first low-frequency oscillator connected in parallel; The second radiation unit includes: 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 bands of the first low-frequency vibrator and the second low-frequency vibrator are the first frequency band, and the working frequency bands of the first high-frequency vibrator, the second high-frequency vibrator and the third high-frequency vibrator are the second frequency band.

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

3. The dual-frequency 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: |d-λ1|≤A3, where λ1 is the wavelength of the electromagnetic wave in the first frequency band, and A3 is the error threshold; The distance between the first high-frequency oscillator and the second high-frequency oscillator, and the distance D between the second high-frequency oscillator and the third high-frequency oscillator satisfy: |D-λ2|≤A4, where λ2 is the wavelength of the electromagnetic wave in the second frequency band, and A4 is the error threshold.

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

5. The dual-band antenna according to claim 4, characterized in that: The vibrator arms are all U-shaped structures, wherein the two parallel vibrator arms share the bottom edge of the U-shaped structure, and the opening directions of the two parallel vibrator arms are the same, and the opening directions of the two vibrator arms in the same vibrator are opposite to each other.

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

7. The dual-frequency antenna according to claim 5 or 6, characterized in that: The first radiation unit includes: a coupling branch, the second radiation unit includes: a grounding point, the third radiation unit includes: a feeding point, 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, the grounding point is connected to the third sub-transmission line, and the first sub-transmission line is connected to the second sub-transmission line through the third 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 provided on the bottom sides of the first high-frequency dipole arm and the first low-frequency dipole arm. The two ends of the coupling branch are respectively connected to the two ends of the openings. The coupling branch is arranged around the first sub-transmission line.

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

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

11. The dual-band antenna according to claim 10, characterized in that: The first type transmission line further includes: a conductive sheet, which is located on a side of the insulating layer away from the circuit board, and is connected to the inner conductor.

12. The dual-frequency antenna according to any one of claims 7 to 11, characterized in that: The third sub-transmission line is a second-type transmission line, and the second-type transmission line includes: a second inner conductor, an outer conductor and a first dielectric layer, the second inner conductor and the outer conductor are coaxial, the first dielectric layer is located between the second inner conductor and the outer conductor, and the outer conductor is connected to the circuit board.

13. The dual-band antenna according to claim 12, characterized in that: The transmission line further includes: a fourth sub-transmission line, the first radiation unit is connected to the feeding unit via 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, characterized in that: 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 is connected to the first sub-transmission line through the fifth sub-transmission line, the first sub-transmission line is connected to the third sub-transmission line through the sixth sub-transmission line, and the third sub-transmission line is 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-category transmission lines, and the third-category transmission lines include: 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 located outside the third inner conductor.

15. The dual-frequency antenna according to any one of claims 1 to 14, characterized in that: 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-frequency antenna according to any one of claims 1 to 15, characterized in that: The oscillators of the first radiation unit, the second radiation unit and the third radiation unit are axially symmetrical structures or centrosymmetrical structures.

17. A communication device, characterized in that: It comprises a shell, a control circuit and a dual-frequency antenna as described in any one of claims 1 to 16, wherein 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 according to claim 17, characterized in that The communication device is a router.

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