Dual-band Yagi antenna and device having communication function

Abstract

The present invention provides a dual-frequency Yagi antenna and a device with a communication function. The dual-frequency Yagi antenna includes a dielectric substrate, a low-frequency reflector, a high-frequency reflector, a dual-mode resonator and a high-frequency director arranged in sequence in a first direction of the dielectric substrate; the dual-mode resonator includes a low-frequency radiation unit and a high-frequency radiation unit, the low-frequency radiation unit is used for directive radiation of low-frequency signals, and the high-frequency radiation unit is used for directive radiation of high-frequency signals; the low-frequency reflector is used for interference superposition of low-frequency signals, and forms a low-frequency antenna array with the low-frequency radiation unit; the high-frequency reflector is used for interference superposition of high-frequency signals, and forms a high-frequency antenna array with the high-frequency radiation unit and the high-frequency director. The dual-frequency Yagi antenna of the present invention can form low-frequency and high-frequency resonant paths on the dielectric substrate, so that the low-frequency signal and the high-frequency signal will not affect each other while obtaining gain, thereby avoiding the problem of split lobes of the low-frequency beam and the high-frequency beam.

Description

Technical Field

[0001] The present invention relates to the field of antennas, and in particular to a dual-frequency Yagi antenna and a device with communication function. Background Art

[0002] At present, the market demand for high-bandwidth, high-traffic, high-speed transmission and high-density access is increasing. Single-band network equipment can no longer meet users' communication needs for high-bandwidth and high-traffic. The emergence of 802.11ac / ax solves this problem, that is, multiple antennas and multiple frequency bands are used for data transmission. With the emergence and gradual widespread application of 802.11a / ax, a large number of dual-band multi-antenna network equipment have emerged, and the demand for dual-band or multi-band antennas with large impedance bandwidth and good radiation characteristics has increased sharply. Planar printed Yagi antennas have the characteristics of low profile, compact structure, high gain and easy debugging, and are widely used. At present, the dual-band Yagi antennas on the market have very narrow frequency bands, and low-frequency signals and high-frequency signals are prone to affect each other, resulting in beam splitting problems, which affects device communication. Summary of the invention

[0003] In view of the above problems, the present invention provides a dual-frequency Yagi antenna and a device with communication function, so that the low-frequency signal and the high-frequency signal will not affect each other while obtaining gain, thereby avoiding the problem of split lobes of the low-frequency beam and the high-frequency beam.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A dual-frequency Yagi antenna comprises a dielectric substrate, a low-frequency reflector, a high-frequency reflector, a dual-mode resonator and a high-frequency director arranged in sequence in a first direction of the dielectric substrate;

[0006] The dual-mode resonator comprises a low-frequency radiation unit and a high-frequency radiation unit, wherein the low-frequency radiation unit is used for directivity radiation of low-frequency signals, and the high-frequency radiation unit is used for directivity radiation of high-frequency signals;

[0007] The low-frequency reflector is used to perform interference superposition on the low-frequency signal and form a low-frequency antenna array with the low-frequency radiation unit;

[0008] The high-frequency reflector is used to perform interference superposition on the high-frequency signal, and forms a high-frequency antenna array with the high-frequency radiation unit and the high-frequency director.

[0009] Preferably, in the dual-frequency Yagi antenna, the low-frequency radiation unit comprises a low-frequency radiation arm and a low-frequency ground arm extending along the same straight line;

[0010] The high-frequency radiation unit includes a high-frequency radiation arm and a high-frequency grounding arm extending along the same straight line;

[0011] The low-frequency radiation arm is connected to the high-frequency radiation arm, and the low-frequency grounding arm is connected to the high-frequency grounding arm.

[0012] Preferably, in the dual-frequency Yagi antenna, the low-frequency radiation arm and the low-frequency ground arm are parallel to the low-frequency reflector.

[0013] Preferably, in the dual-frequency Yagi antenna, the width of the low-frequency radiation arm and the low-frequency ground arm is a first width;

[0014] The width of the high-frequency radiation arm and the high-frequency ground arm is a second width;

[0015] The first width is smaller than the second width.

[0016] Preferably, in the dual-frequency Yagi antenna, the low-frequency radiation arm and the low-frequency ground arm are in the shape of long strips;

[0017] The high-frequency radiation arm and the high-frequency grounding arm are gradually widened from the connection end outwards.

[0018] Preferably, in the dual-frequency Yagi antenna, the lengths of the low-frequency radiation arm and the low-frequency ground arm are respectively 1 / 4 wavelength of the specified low frequency;

[0019] The lengths of the high-frequency radiation arm and the high-frequency ground arm are respectively 1 / 4 wavelength of the specified high frequency.

[0020] Preferably, in the dual-frequency Yagi antenna, the dual-mode resonator further comprises a feed point pad, a ground point pad and a balun transformer;

[0021] The feeding point pad is arranged at the connection part of the low-frequency radiation arm and the high-frequency radiation arm, and is used for feeding in the connection cable receiving signal;

[0022] The balun transformer is connected to the high-frequency radiation arm and the high-frequency ground arm;

[0023] The grounding point pad is arranged at a connection portion between the low-frequency grounding arm and the balun transformer.

[0024] Preferably, in the dual-band Yagi antenna, the low-frequency reflector and the high-frequency reflector are in the shape of long strips;

[0025] The length of the low-frequency reflector is greater than that of the low-frequency radiation unit;

[0026] The high-frequency reflector is longer than the high-frequency radiation unit.

[0027] Preferably, in the dual-band Yagi antenna, the high-frequency director includes a preset number of long high-frequency parasitic array elements parallel to each other, the length of the high-frequency parasitic array element is smaller than the high-frequency radiation unit, and the high-frequency parasitic array element is parallel to the high-frequency radiation unit.

[0028] The present invention also provides a device with communication function, comprising the dual-frequency Yagi antenna.

[0029] The present invention provides a dual-frequency Yagi antenna, which includes a dielectric substrate, a low-frequency reflector, a high-frequency reflector, a dual-mode resonator and a high-frequency director arranged in sequence in a first direction of the dielectric substrate; the dual-mode resonator includes a low-frequency radiation unit and a high-frequency radiation unit, the low-frequency radiation unit is used to radiate a low-frequency signal in a directionally manner, and the high-frequency radiation unit is used to radiate a high-frequency signal in a directionally manner; the low-frequency reflector is used to perform interference superposition on the low-frequency signal, and form a low-frequency antenna array with the low-frequency radiation unit; the high-frequency reflector is used to perform interference superposition on the high-frequency signal, and form a high-frequency antenna array with the high-frequency radiation unit and the high-frequency director. The dual-frequency Yagi antenna of the present invention can form a low-frequency band and a high-frequency band resonant path on a dielectric substrate with a smaller space by sequentially arranging a low-frequency reflector, a high-frequency reflector, a dual-mode resonator and a high-frequency director in a first horizontal direction on the dielectric substrate, so that the low-frequency signal and the high-frequency signal will not affect each other while obtaining gain, thereby avoiding the problem of split lobes of the low-frequency beam and the high-frequency beam.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope of protection of the present invention. In each of the drawings, similar components are numbered similarly.

[0032] Figure 1 1 is a schematic diagram of the structure of a dual-frequency Yagi antenna provided in Embodiment 1 of the present invention;

[0033] Figure 2 1 is a schematic structural diagram of a dual-frequency Yagi antenna provided in Embodiment 2 of the present invention;

[0034] Figure 3 It is a structural plan schematic diagram of a dual-frequency Yagi antenna provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0037] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0038] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0039] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present invention belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present invention.

[0040] Example 1

[0041] Figure 1 It is a structural schematic diagram of a dual-frequency Yagi antenna provided in Example 1 of the present invention.

[0042] The dual-frequency Yagi antenna 100 includes a dielectric substrate 110, a low-frequency reflector 120, a high-frequency reflector 130, a dual-mode resonator 140 and a high-frequency director 150 arranged in sequence in a first direction of the dielectric substrate 110;

[0043] In the embodiment of the present invention, the dielectric substrate 110 mainly includes a metal thin plate and an insulating dielectric layer. The material of the insulating dielectric layer can be silicon and ceramics that are formed at high temperature and high pressure and then polished, and is used to make various antenna components arranged on the surface and achieve electrical insulation. The thickness of the dielectric substrate 110 is much smaller than the wavelength of the antenna. The metal thin layer at the bottom of the substrate is connected to the ground plane, and the front side is made into a metal thin layer of a specific shape by a photolithography process, thereby forming the low-frequency reflector 120, high-frequency reflector 130, dual-mode resonator 140 and high-frequency director 150.

[0044] The dual-mode resonator 140 includes a low-frequency radiation unit and a high-frequency radiation unit, wherein the low-frequency radiation unit is used to radiate low-frequency signals in a directionally manner, and the high-frequency radiation unit is used to radiate high-frequency signals in a directionally manner;

[0045] In the embodiment of the present invention, the dual-mode resonator 140 is disposed between the high-frequency reflector 130 and the high-frequency director 150, so that the low-frequency reflector 120 does not affect the radiation of the high-frequency signal, and the high-frequency reflector 130 and the high-frequency director 150 do not affect the radiation of the low-frequency signal. The dual-mode resonator 140 includes a low-frequency radiation unit and a high-frequency radiation unit, and the low-frequency radiation unit and the high-frequency radiation unit can be long strips, and the length of the low-frequency radiation unit is greater than that of the high-frequency radiation unit, so that the low-frequency radiation unit excites and radiates the low-frequency signal, and the high-frequency radiation unit excites and radiates the high-frequency signal.

[0046] The low-frequency reflector 120 is used to perform interference superposition on the low-frequency signal and form a low-frequency antenna array with the low-frequency radiation unit;

[0047] In the embodiment of the present invention, the low-frequency reflector 120 is parallel to the low-frequency radiation unit and is spaced by a preset distance, so that the low-frequency reflector 120 and the low-frequency radiation unit form a low-frequency antenna array. The preset distance between the low-frequency reflector 120 and the low-frequency radiation unit can be 1 / 4 wavelength of the specified low frequency, which is not limited here. In order to make the low-frequency reflector 120 have a better reflection effect, the length of the low-frequency reflector 120 can be greater than the low-frequency radiation unit.

[0048] The high-frequency reflector 130 is used to perform interference superposition on the high-frequency signal, and forms a high-frequency antenna array with the high-frequency radiation unit and the high-frequency director 150 .

[0049] In the embodiment of the present invention, the high-frequency reflector 130 is parallel to the high-frequency radiation unit and is spaced by a preset distance, so that the high-frequency reflector 130 and the high-frequency radiation unit form a high-frequency antenna array. The preset distance between the high-frequency reflector 130 and the high-frequency radiation unit can be 1 / 4 wavelength of the specified high frequency, which is not limited here. In order for the high- and low-frequency reflectors 120 to have a better reflection effect, the length of the high-frequency reflector 130 can be greater than that of the low-frequency radiation unit.

[0050] In the embodiment of the present invention, by sequentially arranging a low-frequency reflector 120, a high-frequency reflector 130, a dual-mode resonator 140, and a high-frequency director 150 in the first horizontal direction on the dielectric substrate 110, low-frequency and high-frequency resonant paths can be formed on the dielectric substrate 110 in a relatively small space, so that the low-frequency signal and the high-frequency signal can obtain gain without affecting each other, thereby avoiding the problem of splitting of the low-frequency beam and the high-frequency beam.

[0051] Example 2

[0052] Figure 2 It is a schematic structural diagram of a dual-frequency Yagi antenna provided in Example 2 of the present invention.

[0053] The dual-frequency Yagi antenna 200 includes a dielectric substrate 210, a low-frequency reflector 220, a high-frequency reflector 230, a dual-mode resonator 240, and a high-frequency director 250 arranged in sequence in a first direction of the dielectric substrate 210;

[0054] The dual-mode resonator 240 includes a low-frequency radiation unit 241 and a high-frequency radiation unit 242, wherein the low-frequency radiation unit 241 is used to radiate low-frequency signals in a directionally manner, and the high-frequency radiation unit 242 is used to radiate high-frequency signals in a directionally manner;

[0055] The low-frequency reflector 220 is used to perform interference superposition on the low-frequency signal and form a low-frequency antenna array with the low-frequency radiation unit 241;

[0056] The high-frequency reflector 230 is used to perform interference superposition on the high-frequency signal, and forms a high-frequency antenna array with the high-frequency radiation unit 242 and the high-frequency director 250 .

[0057] In the embodiment of the present invention, the dual-mode resonator 240 further includes a feeding point pad 243, a grounding point pad 244 and a balun transformer 245;

[0058] The feeding point pad 243 is arranged at the connection part of the low-frequency radiation arm and the high-frequency radiation arm, and is used to feed in the connecting cable receiving signal; wherein, after the signal is fed in, it can be radiated as a high-frequency signal after being excited by the high-frequency radiation unit 242, and can be radiated as a low-frequency signal after being excited by the low-frequency radiation unit 241.

[0059] The balun transformer 245 is connected to the high-frequency radiation arm and the high-frequency grounding arm; wherein, the balun transformer 245 serves as a matching unit for the low-frequency radiation unit 241 and the high-frequency radiation unit 242, and can optimize the impedance bandwidth of the low-frequency radiation unit 241 and the high-frequency radiation unit 242 to achieve bandwidth matching, thereby making the low-frequency radiation unit 241 and the high-frequency radiation unit 242 have better radiation characteristics.

[0060] The grounding pad 244 is disposed at the connection portion between the low-frequency grounding arm and the balun transformer 245. The grounding pad 244 may be connected to the grounding plate of the dielectric substrate 210, which is not limited here.

[0061] The high-frequency director 250 includes a preset number of long high-frequency parasitic array elements 251 parallel to each other. The high-frequency parasitic array elements 251 are shorter than the high-frequency radiation units 242 and are parallel to the high-frequency radiation units 242 .

[0062] In the embodiment of the present invention, the extension lines of the high-frequency reflector 230 , the high-frequency radiation unit 242 and the high-frequency parasitic array element 251 are parallel to each other, and the intervals between the multiple high-frequency parasitic array elements 251 may be 1 / 4 wavelength of the specified high frequency.

[0063] Example 3

[0064] Figure 3 It is a structural plan schematic diagram of a dual-frequency Yagi antenna provided in Example 3 of the present invention.

[0065] The dual-frequency Yagi antenna 300 includes a dielectric substrate 310, a low-frequency reflector 320, a high-frequency reflector 330, a dual-mode resonator 340, and a high-frequency director 350 arranged in sequence in a first direction of the dielectric substrate 310;

[0066] The dual-mode resonator 340 includes a low-frequency radiation unit 341 and a high-frequency radiation unit 342, wherein the low-frequency radiation unit 341 is used to radiate low-frequency signals in a directionally manner, and the high-frequency radiation unit 342 is used to radiate high-frequency signals in a directionally manner;

[0067] The low-frequency reflector 320 is used to perform interference superposition on the low-frequency signal and form a low-frequency antenna array with the low-frequency radiation unit 341;

[0068] The high-frequency reflector 330 is used to perform interference superposition on the high-frequency signal, and forms a high-frequency antenna array with the high-frequency radiation unit 342 and the high-frequency director 350 .

[0069] In an embodiment of the present invention, the low-frequency radiation unit 341 includes a low-frequency radiation arm 3411 and a low-frequency grounding arm 3412 extending along the same straight line; the high-frequency radiation unit 342 includes a high-frequency radiation arm 3421 and a high-frequency grounding arm 3422 extending along the same straight line; the low-frequency radiation arm 3411 is connected to the high-frequency radiation arm 3421, and the low-frequency grounding arm 3412 is connected to the high-frequency grounding arm 3422.

[0070] In the embodiment of the present invention, the low-frequency radiation arm 3411 and the low-frequency grounding arm 3412 are parallel to the low-frequency reflector 320 .

[0071] In the embodiment of the present invention, the width of the low-frequency radiation arm 3411 and the low-frequency ground arm 3412 is a first width; the width of the high-frequency radiation arm 3421 and the high-frequency ground arm 3422 is a second width; and the first width is smaller than the second width.

[0072] In the embodiment of the present invention, the low-frequency radiation arm 3411 and the low-frequency grounding arm 3412 are in the shape of long strips; the high-frequency radiation arm 3421 and the high-frequency grounding arm 3422 are gradually widened from the connection end. The high-frequency radiation arm 3421 and the high-frequency grounding arm 3422 gradually widen outwards, which can reduce the sensitivity of the high-frequency impedance to the frequency and improve the bandwidth and resonance depth.

[0073] In the embodiment of the present invention, the lengths of the low-frequency radiation arm 3411 and the low-frequency ground arm 3412 are respectively 1 / 4 wavelength of the specified low frequency; the lengths of the high-frequency radiation arm 3421 and the high-frequency ground arm 3422 are respectively 1 / 4 wavelength of the specified high frequency.

[0074] In an embodiment of the present invention, the dual-mode resonator 340 also includes a feeding point pad 343, a grounding point pad 344 and a balun transformer 345; the feeding point pad 343 is arranged at the connection part of the low-frequency radiation arm 3411 and the high-frequency radiation arm 3421, and is used to connect the cable to feed in the received signal; the balun transformer 345 is connected to the high-frequency radiation arm 3421 and the high-frequency grounding arm 3422; the grounding point pad 344 is arranged at the connection part of the low-frequency grounding arm 3412 and the balun transformer 345.

[0075] In the embodiment of the present invention, the low-frequency reflector 320 and the high-frequency reflector 330 are in the shape of long strips; the low-frequency reflector 320 is longer than the low-frequency radiation unit 341 ; the high-frequency reflector 330 is longer than the high-frequency radiation unit 342 .

[0076] In an embodiment of the present invention, the high-frequency director 350 includes a first high-frequency parasitic array element 351 and a second high-frequency parasitic array element 352 which are parallel to each other. The length of the first high-frequency parasitic array element 351 and the second high-frequency parasitic array element 352 is shorter than that of the high-frequency radiation unit 342, and they are parallel to the high-frequency radiation unit 342.

[0077] In the embodiment of the present invention, through the above design, the impedance characteristics, antenna gain, standing wave ratio, 3dB lobe width and other performance parameters of the dual-frequency antenna meet the requirements, thereby obtaining a low-cost, high-communication efficiency, easy-to-adjust dual-frequency Yagi antenna. Among them, the low-frequency band gain of the present invention is greater than 6.5dBi; the standing wave ratio is less than 1.5; the characteristic impedance is 50Ω; the high-frequency band gain is greater than 8.5dBi; the standing wave ratio is less than 2; the characteristic impedance is 50Ω, and the connector method can be IPX with RF shielding wire, and the length of the shielding wire can be optional.

[0078] In addition, the present invention also provides a device with a communication function, which may include a smart phone, a tablet computer, a car computer, a smart wearable device, etc. The device with a communication function includes the above-mentioned dual-frequency Yagi antenna, a memory and a processor, the memory can be used to store a computer program, and the processor runs the computer program, so that the device with a communication function can perform remote communication through the above-mentioned dual-frequency Yagi antenna.

[0079] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A dual-frequency Yagi antenna, characterized in that: It comprises a dielectric substrate, a low-frequency reflector, a high-frequency reflector, a dual-mode resonator and a high-frequency director which are sequentially arranged in a first direction of the dielectric substrate; The dual-mode resonator comprises a low-frequency radiation unit and a high-frequency radiation unit, wherein the low-frequency radiation unit is used for directivity radiation of low-frequency signals, and the high-frequency radiation unit is used for directivity radiation of high-frequency signals; The low-frequency reflector is used to perform interference superposition on the low-frequency signal and form a low-frequency antenna array with the low-frequency radiation unit; wherein the length of the low-frequency reflector is greater than the low-frequency radiation unit; The high-frequency reflector is used to perform interference superposition on the high-frequency signal, and to form a high-frequency antenna array with the high-frequency radiation unit and the high-frequency director; The low-frequency radiation unit includes a low-frequency radiation arm and a low-frequency grounding arm extending along the same straight line; The high-frequency radiation unit comprises a high-frequency radiation arm and a high-frequency grounding arm extending along the same straight line; the high-frequency radiation arm and the high-frequency grounding arm are gradually widened from the connection end outward; the width of the low-frequency radiation arm and the low-frequency grounding arm is a first width; the width of the high-frequency radiation arm and the high-frequency grounding arm is a second width; the first width is smaller than the second width; The low-frequency radiation arm is connected to the high-frequency radiation arm, and the low-frequency grounding arm is connected to the high-frequency grounding arm; The dual-mode resonator also includes a feed point pad, a ground point pad and a balun transformer; The feeding point pad is arranged at the connection part of the low-frequency radiation arm and the high-frequency radiation arm, and is used for feeding in the connection cable receiving signal; The balun transformer is connected to the high-frequency radiation arm and the high-frequency ground arm; The grounding point pad is arranged at a connection portion between the low-frequency grounding arm and the balun transformer.

2. The dual-frequency Yagi antenna according to claim 1, characterized in that: The low frequency radiation arm and the low frequency ground arm are parallel to the low frequency reflector.

3. The dual-frequency Yagi antenna according to claim 1, characterized in that: The low-frequency radiation arm and the low-frequency grounding arm are in a long strip shape.

4. The dual-frequency Yagi antenna according to claim 1, characterized in that: The lengths of the low-frequency radiation arm and the low-frequency ground arm are respectively 1 / 4 wavelength of the specified low frequency; The lengths of the high-frequency radiation arm and the high-frequency ground arm are respectively 1 / 4 wavelength of the specified high frequency.

5. The dual-frequency Yagi antenna according to claim 1, characterized in that: The low-frequency reflector and the high-frequency reflector are in the shape of long strips; The length of the low-frequency reflector is greater than that of the low-frequency radiation unit; The high-frequency reflector is longer than the high-frequency radiation unit.

6. The dual-frequency Yagi antenna according to claim 1, characterized in that: The high-frequency director includes a preset number of long high-frequency parasitic array elements parallel to each other. The length of the high-frequency parasitic array elements is shorter than that of the high-frequency radiation unit and is parallel to the high-frequency radiation unit.

7. A device with communication function, characterized in that: The dual-frequency Yagi antenna comprises the dual-frequency Yagi antenna according to any one of claims 1 to 6.

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