CN109755737A - A kind of millimeter wave antenna - Google Patents
A kind of millimeter wave antenna Download PDFInfo
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- CN109755737A CN109755737A CN201910176881.5A CN201910176881A CN109755737A CN 109755737 A CN109755737 A CN 109755737A CN 201910176881 A CN201910176881 A CN 201910176881A CN 109755737 A CN109755737 A CN 109755737A
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Abstract
This application involves a kind of millimeter wave antennas, comprising: ground plane, first medium layer, feed layer, second dielectric layer, the first radiating layer, third dielectric layer and the second radiating layer being cascading；The feed energy received is transferred to the first radiating layer for receiving feed by feed layer in a coupled manner；First radiating layer is used to receive the feed energy of feed layer transmission, and a part feed energy radiation received is generated the first resonance peak；Also, the another part received feed energy is also transferred to the second radiating layer by the first radiating layer in a coupled manner；Second radiating layer is used to receive the feed energy of the first radiating layer transmission, and the feed energy received is radiated and generates the second resonance peak；The difference of the corresponding wavelength of first resonance peak and the corresponding wavelength of the second resonance peak is within a preset range.The application can be superimposed by the radiation resonance of the first radiating layer with the radiation resonance of the second radiating layer, and then effectively extend the bandwidth of millimeter wave antenna.
Description
Technical field
This application involves communication technique fields, more particularly to a kind of millimeter wave antenna.
Background technique
Receiving and transmitting unit of the antenna as signal, form is varied, and a variety of different antenna forms have it to answer
Frequency range and occasion.With the development of communication technology, millimetre-wave attenuator has become mainstream instantly, and millimeter wave antenna is as logical
Believe that the receiving and transmitting unit of system signal is indispensable.
In the application such as 5G mobile communication system, millimeter wave antenna is put forward new requirements, that is, wider bandwidth,
The lower, miniaturized structure of power transmission loss, radiation index are good etc..However, the bandwidth of operation of traditional millimeter wave antenna is relatively narrow,
Gain performance is not good enough, therefore, how design thickness thin structure while take into account the impact of performance such as the beamwidth of antenna, gain, be milli
The key points and difficulties of Metric wave aerial design.
Summary of the invention
Based on this, it is necessary in view of the above technical problems, provide a kind of millimeter wave antenna that can be improved bandwidth.
The technical solution adopted by the present invention to solve the technical problems is: a kind of millimeter wave antenna includes at least:
Ground plane, first medium layer, feed layer, second dielectric layer, the first radiating layer, the third medium being cascading
Layer and the second radiating layer；The feed layer transmits the feed energy received for receiving feed in a coupled manner
To the first radiating layer；First radiating layer is used to receive the feed energy of the feed layer transmission, and by receive one
Divide the radiation of feed energy and generates the first resonance peak；Also, the another part received is also fed energy by first radiating layer
Amount is transferred to the second radiating layer in a coupled manner；Second radiating layer is used to receive the feed of the first radiating layer transmission
Energy, and the feed energy received is radiated and generates the second resonance peak；The corresponding wavelength of first resonance peak with it is described
The difference of the corresponding wavelength of second resonance peak is within a preset range.
In one of them embodiment, the feed layer include mutually splice the first current feed department to link together and
Second current feed department, the width of first current feed department is of different size with second current feed department, to realize the tune of impedance matching
Section.
In one of them embodiment, the center of the feed layer, first radiating layer and second radiating layer
Orthographic projection of the position on the ground plane is overlapped, and the edge of first current feed department from the first medium layer extends internally,
Second current feed department connects first current feed department, and the width of second current feed department is less than the width of first current feed department
Degree.
In one of them embodiment, first radiating layer and second radiating layer are rectangular radiation layer；Institute
The length for stating the first radiating layer is different from the length of second radiating layer.
In one of them embodiment, the operation wavelength of the millimeter wave antenna is λ, the length of first radiating layer
For L1, the length of second radiating layer is L2, then L1 and L2 meet following relational expression:
(1-10%) * 1/2 λ≤L1≤1/2 λ, 1/2 λ≤L2≤(1+10%) * 1/2 λ,
Alternatively, (1-10%) * 1/2 λ≤L2≤1/2 λ, 1/2 λ≤L1≤(1+10%) * 1/2 λ.
In one of them embodiment, the width of first radiating layer is of different size with second radiating layer.
In one of them embodiment, the feed layer is far from first radiating layer and close to the ground plane.
In one of them embodiment, the distance between the feed layer and the ground plane are h, then (1-10%) *
0.1mm≤h≤(1+10%) * 0.1mm.
In one of them embodiment, the first medium layer, second dielectric layer, the material of third dielectric layer are identical,
It is liquid crystal polymer.
In one of them embodiment, when the millimeter wave antenna is with a thickness of T, the operating wave of the millimeter wave antenna
When a length of λ, T=0.07 λ, 0.3mm≤T≤0.5mm, the frequency bandwidth of the millimeter wave antenna are 24.5GHz~27.6GHz.
Liquid crystal polymer (LCP) can be used to be used as baseplate material for millimeter wave antenna of the invention, and design thickness is thin, frequency band
Wide and radiation characteristic is good, can be applied to the millimeter wave antenna unit of 5G millimeter wave array.
Detailed description of the invention
Fig. 1 is the diagrammatic cross-section of the millimeter wave antenna in one embodiment；
Fig. 2 is the partial schematic plan view of the millimeter wave antenna in one embodiment；
Fig. 3 is another partial schematic plan view of the millimeter wave antenna in one embodiment；
Fig. 4 is the another partial schematic plan view of the millimeter wave antenna in one embodiment；
Fig. 5 is the standing-wave ratio simulation curve figure of the millimeter wave antenna in one embodiment；
Fig. 6 is E face and H face directional diagram of the millimeter wave antenna in 24.5GHz in one embodiment；
Fig. 7 is E face and H face directional diagram of the millimeter wave antenna in 26.5GHz in one embodiment；
Fig. 8 is E face and H face directional diagram of the millimeter wave antenna in 27.5GHz in one embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
Millimeter wave antenna provided by the present application can be, but not limited to the millimeter wave millimeter wave antenna to communicate applied to 5G.
The shortcomings that millimeter wave antenna has the thin advantage of thickness, but there is also narrow bandwidths simultaneously.Design thickness is thin, volume
While small and easy to process millimeter wave antenna, the performances such as the beamwidth of antenna, gain are taken into account, are the emphasis of millimeter wave antenna design
And difficult point.
In one embodiment, as shown in Figures 1 to 4, a kind of millimeter wave antenna is provided, including what is be cascading
Ground plane 100, first medium layer 200, feed layer 300, second dielectric layer 400, the first radiating layer 500, third dielectric layer 600 with
And second radiating layer 700.
First medium layer 200, second dielectric layer 400 and third dielectric layer 600 can select liquid crystal polymer.Liquid crystal
Polymer has low loss characteristic.Therefore, it selects liquid crystal polymer as dielectric material, aerial loss can be effectively reduced.Together
When, liquid crystal polymer, can be preferably integrated with circuit system as flexible material, and then is convenient for modularized processing.
Certainly, other materials also may be selected in first medium layer 200, second dielectric layer 400 and third dielectric layer 600.
Three can choose identical material in order to produce and process.But the application is not limited to this, three also can choose difference
Material.
Ground plane 100, feed layer 300, the first radiating layer 500 and the second radiating layer 700 can choose the conductors such as metal
Material.Ground plane 300 can play the role of reflection to electromagnetic wave.
Feed layer 300, for receiving feed.Specifically, feed layer 300 can be fed using coaxial line (not shown).
The outer conductor of coaxial line can connect ground plane.Meanwhile the inner conductor of coaxial line can run through ground plane 100 and first medium
Layer 200 and connect feed layer 300, and then feed layer 300 is fed.
Meanwhile feed layer 300 is also by the feed energy transmission received to the first radiating layer 500, and then its is made to carry out spoke
It penetrates.Second dielectric layer 400 is provided between feed layer 300 and the first radiating layer 500.Therefore, the feedback that feed layer 300 will receive
Electric flux is transferred to the first radiating layer 500 in a coupled manner.First radiating layer 500 receives the feed energy of the transmission of feed layer 300
Amount, and a part feed energy radiation received is generated into the first resonance peak.
Also, the second radiating layer 700 is additionally provided in the embodiment of the present application.First radiating layer 500 is also another by what is received
Part feed energy transmission radiates it to the second radiating layer 700.First radiating layer 500 and the second radiating layer 700
Between be provided with third dielectric layer 600.Therefore, the first radiating layer 500 couples the another part received feed energy
Mode is transferred to the second radiating layer 700.Second radiating layer 700 is used to receive the feed energy of the first radiating layer 500 transmission, and will
The feed energy received radiates and generates the second resonance peak.
The difference of the corresponding wavelength of first resonance peak and the corresponding wavelength of the second resonance peak is within a preset range.Therefore, first
The resonance that the resonance that radiating layer 500 generates can be generated with the second radiating layer 700 can be overlapped mutually, and then can effectively be widened
The bandwidth of millimeter wave antenna.Here preset range refers to the resonance and the second spoke that the first radiating layer 500 can be made to generate
The resonance for penetrating the generation of layer 700 is closed on and can be overlapped mutually, and then expands the wave-length coverage of overall bandwidth, specifically can be according to reality
Border product demand is set.Therefore, the application can pass through the radiation resonance and the second radiating layer 700 of the first radiating layer 500
The superposition of radiation resonance, and then effectively extend the bandwidth of millimeter wave antenna.
It specifically sees, the embodiment of the present application is when millimeter wave antenna is with a thickness of T, and the operation wavelength of millimeter wave antenna is λ
When, T=0.07 λ, 0.3mm≤T≤0.5mm can be set, the frequency bandwidth of millimeter wave antenna is 24.5GHz~27.6GHz.
In one embodiment, with reference to Fig. 4, feed layer 300 includes the first current feed department 310 interconnected and the second feedback
Electric portion 320.The width of first current feed department 310 is of different size with the second current feed department 320, to realize the adjusting of impedance matching.By
The inner conductor of coaxial line is commonly connected in feed layer 300 and radiating layer is fed.Therefore, it is necessary to adjust in coaxial line
The link position of conductor and feed layer 300 comes so that the impedance of coaxial line input and characteristic impedance (such as 50 Europe of coaxial line
Nurse) match.
In the present embodiment, since feed layer 300 includes the first current feed department 310 and the second current feed department of different size
320, so that impedance matching is more easier.So need to only can be adjusted along the up and down direction in figure same in matching process
The link position of axis and feed layer 300 can realize resistance so that coaxial line can connect the feed layer 300 of suitable width
Anti- matching.Therefore, the present embodiment can not adjust the link position of coaxial line and feed layer 300 along the left and right directions in figure,
So that feed layer 300 can be located at the middle position of the width direction of antenna, so that antenna structure has symmetry,
And be conducive to the symmetrical of directional diagram.
Specifically, feed layer 300, the first radiating layer 500 and 700 center of the second radiating layer can be set in ground plane
Orthographic projection on 100 is overlapped, and then improves directional diagram symmetry.The edge of first current feed department 310 from first medium layer 200 is inside
Extend.Second current feed department 320 connects the first current feed department 310, and the width of the second current feed department 320 is less than the first current feed department 310
Width.And then reduce influence of the feed layer 300 to current distribution on radiating layer.Certainly, the application embodiment is not limited to this,
For example, the width that may also set up the second current feed department 320 is greater than the width etc. of the first current feed department 310.
In one embodiment, with reference to Fig. 2 and Fig. 3, the first radiating layer 500 and the second radiating layer 700 are rectangle spoke
Penetrate layer.Meanwhile the length for designing the first radiating layer 500 is different from the length of the second radiating layer 700, and then realizes the first radiating layer
The first resonance peak that 500 radiation generate is different from the second resonance peak that the radiation of the second radiating layer 700 generates.Certainly, in the application
In embodiment, the radiating layer of the first radiating layer 500 and/or the second radiating layer 700 or other shapes in addition to a rectangle,
As long as it can produce micro-strip radiation.
Specifically, the operation wavelength of millimeter wave antenna is λ, and the length of the first radiating layer 500 is L1, the second radiating layer 700
Length be L2.1/2 λ≤L1≤(1+10%) * 1/2 λ, while 1/2 λ≤L2≤(1+10%) * 1/2 λ can be set into.Or
Person, (1-10%) * 1/2 λ≤L2≤1/2 λ, 1/2 λ≤L1≤(1+10%) * 1/2 λ.At this point, the value of L1 and L2 is around 1/2 λ
Two different values.Therefore, the first radiating layer 500 and the second radiating layer 700 can produce two close on can mutually fold
The resonance added, and then expand the beamwidth of antenna.
In one embodiment, with continued reference to Fig. 2 and Fig. 3, the width W1 of the first radiating layer 500 also with the second radiating layer
700 width W2 is different.Therefore, the capacitor between the first radiating layer 500 and the second radiating layer 700 can reduce, so that antenna
Bandwidth further broaden.Specifically, such as W1 can be set less than W2.It is designed to relative to W1 wide as W2, W1 is less than
The setting of W2 effectively reduces the capacitor generated therebetween, and then further expands bandwidth.
In one embodiment, with reference to Fig. 1, feed layer 300 is far from the first radiating layer 500, and close ground plane 100.This
When, the capacitor between feed layer 300 and the first radiating layer 500 can be effectively reduced, that is, reduces the capacitor that feed introduces, Jin Erjin
One step spreading antenna bandwidth.Specifically, when the distance between feed layer 300 and ground plane 100 are h, (1-10%) * can be set
0.1mm≤h≤(1+10%) * 0.1mm.
In one embodiment of the application, the specific length of millimeter wave antenna is (4mm-8mm), and width is (4mm-8mm), thick
Degree is (0.3mm-0.5mm).Thickness (0.3mm-0.5mm) is only about 0.07 times of operation wavelength, has the characteristics that ultralow section.
Be arranged feed layer 300 between ground plane 100 at a distance from be 0.1mm, and then make it away from the first radiating layer 500, and close to ground connection
Layer 100.Feed layer 300 includes the first current feed department 310 and the second current feed department 320 of different size.First radiating layer 500 is set
Length be slightly above 1/2 length of operation wavelength, the length of the second radiating layer 700 is slightly below 1/2 length of operation wavelength so that
Antenna generates two resonance closed on.
Fig. 5 is the standing-wave ratio simulation curve figure of the millimeter wave antenna of the embodiment.It follows that from 24.5GHz-
When 27.6GHz, antenna standing wave ratio VSWR < 2.Therefore, the bandwidth of the millimeter wave antenna of the embodiment has reached 3.1GHz.And then make
There must be the millimeter wave antenna of ultralow section to reach wider working band.The millimeter wave antenna of Fig. 6 embodiment exists
The face E of 24.5GHz and the face H directional diagram.E face and H face directional diagram of the millimeter wave antenna of Fig. 7 embodiment in 26.5GHz.Fig. 8
E face and H face directional diagram of the millimeter wave antenna of the embodiment in 27.5GHz.It follows that the millimeter wave antenna of the embodiment exists
When 24.5GHz, gain 6.42dB；In 26.5GHz, gain 6.81dB；In 27.5dB, gain 6.48dB.Therefore,
Pattern structure is symmetrical and gain stabilization, is highly suitable for that space is small, the high 5G wireless communication of integrated level.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of millimeter wave antenna, which is characterized in that include at least:
The ground plane that is cascading, first medium layer, feed layer, second dielectric layer, the first radiating layer, third dielectric layer with
And second radiating layer；
The feed energy received is transferred to the first radiating layer for receiving feed by the feed layer in a coupled manner；
First radiating layer is used to receive the feed energy of the feed layer transmission, and a part feed energy that will be received
It radiates and generates the first resonance peak；Also, the another part received is also fed energy to couple by first radiating layer
Mode is transferred to the second radiating layer；
Second radiating layer is used to receive the feed energy of the first radiating layer transmission, and the feed energy spoke that will be received
It penetrates and generates the second resonance peak；
The difference of the corresponding wavelength of first resonance peak and the corresponding wavelength of second resonance peak is within a preset range.
2. a kind of millimeter wave antenna according to claim 1, which is characterized in that the feed layer includes mutually splicing connection
The width of the first current feed department and the second current feed department together, the width of first current feed department and second current feed department is not
Together, to realize the adjusting of impedance matching.
3. a kind of millimeter wave antenna according to claim 2, which is characterized in that the feed layer, first radiating layer
It is overlapped with orthographic projection of second radiating layer center on the ground plane, first current feed department is situated between from described first
The edge of matter layer extends internally, and second current feed department connects first current feed department, and the width of second current feed department is small
In the width of first current feed department.
4. a kind of millimeter wave antenna according to claim 1, which is characterized in that
First radiating layer and second radiating layer are rectangular radiation layer；
The length of first radiating layer is different from the length of second radiating layer.
5. a kind of millimeter wave antenna according to claim 4, which is characterized in that
The operation wavelength of the millimeter wave antenna is λ, and the length of first radiating layer is L1, the length of second radiating layer
For L2, then L1 and L2 meet following relational expression:
(1-10%) * 1/2 λ≤L1≤1/2 λ, 1/2 λ≤L2≤(1+10%) * 1/2 λ,
Alternatively, (1-10%) * 1/2 λ≤L2≤1/2 λ, 1/2 λ≤L1≤(1+10%) * 1/2 λ.
6. a kind of millimeter wave antenna according to claim 4, which is characterized in that the width of first radiating layer with it is described
Second radiating layer it is of different size.
7. a kind of millimeter wave antenna according to claim 1, which is characterized in that the feed layer is far from first radiation
Layer and close to the ground plane.
8. a kind of millimeter wave antenna according to claim 7, which is characterized in that between the feed layer and the ground plane
Distance be h, then (1-10%) * 0.1mm≤h≤(1+10%) * 0.1mm.
9. a kind of millimeter wave antenna according to claim 1, which is characterized in that the first medium layer, second dielectric layer,
The material of third dielectric layer is identical, is liquid crystal polymer.
10. millimeter wave antenna according to any one of claims 1 to 9, which is characterized in that when the thickness of the millimeter wave antenna
Degree is T, when the operation wavelength of the millimeter wave antenna is λ, T=0.07 λ, 0.3mm≤T≤0.5mm, the millimeter wave antenna
Frequency bandwidth is 24.5GHz~27.6GHz.
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| CN201910176881.5A CN109755737A (en) | 2019-03-08 | 2019-03-08 | A kind of millimeter wave antenna |
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| CN112467356A (en) * | 2019-09-09 | 2021-03-09 | 北京小米移动软件有限公司 | Antenna assembly and terminal |
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