CN205595452U

CN205595452U - Symmetry formula MIMO antenna structure

Info

Publication number: CN205595452U
Application number: CN201620435330.8U
Authority: CN
Inventors: 王翟; 牛宝星
Original assignee: Shenzhen Sunway Communication Co Ltd
Current assignee: Shenzhen Sunway Communication Co Ltd
Priority date: 2016-05-13
Filing date: 2016-05-13
Publication date: 2016-09-21
Anticipated expiration: 2026-05-13

Abstract

The utility model discloses a symmetry formula MIMO antenna structure, it is including the PCB substrate, be equipped with on the PCB substrate and cover the copper layer, covering and having seted up a plurality of trapped wave portions on the copper layer, covering between per two trapped wave portions is formed with the feed unit on the copper layer, the feed unit is by covering the marginal of copper layer and constituting with this feed copper layer of covering the adjacent setting in copper layer, the PCB substrate that trapped wave portion is in slot shape and this slot is exposed, a plurality of trapped wave portions along the marginal evenly distributed who covers the copper layer, trapped wave portion extends to the center department of covering the copper layer, just there are default distance in trapped wave portion and the center department of covering the copper layer. The utility model has the characteristics of simple structure, easily realize, the isolation is high.

Description

A kind of symmetrical expression mimo antenna structure

Technical field

This utility model relates to mimo antenna, particularly relates to a kind of symmetrical expression mimo antenna structure.

Background technology

Along with the development of antenna technology, mimo antenna gets more and more in the application of router side, and router The antenna of end has been not limited to the combination of the combination even 3*2 of 2*2, being applied in combination of more antennas Through gradually popularizing, and requiring to place more antenna in a limited space, the physical distance between antenna becomes The most urgent, isolation problem becomes crucial therewith, and high-isolation is to ensure that the premise of antenna system performance.

In prior art, the first mimo antenna is as shown in Figure 6, and PCB substrate 100 is provided with justifying and covers copper Layer 101, the edge of copper clad layers 101 is provided with multiple feed element 102, and this antenna is without trap structure, figure 7 is the impedance operator without trap structural antenna and isolation characteristic, principle of reciprocity based on antenna, by S11/S21/S31 just can characterize its impedance operator, learns from data, under conditions of without trap structure, Isolation at 2.4GHz is only-12dB.

In prior art, the second mimo antenna is as shown in Figure 8, and PCB substrate 100 is provided with justifying and covers copper Layer 101, the edge of copper clad layers 101 is provided with multiple feed element 102, and copper clad layers 101 is provided with cross Intersect slit shape trap structure 103, this trap structure 103 by copper clad layers 101 fourth class piecemeal, Fig. 9 be by Overall impedance characteristic after the antenna quartering, learns from data, the isolation at 2.4GHz is also only-11dB.

By both the above structure it can be seen that existing mimo antenna all exists the defect that isolation is low.

Utility model content

The technical problems to be solved in the utility model is, for the deficiencies in the prior art, it is provided that a kind of structure Simply, be easily achieved, symmetrical expression mimo antenna structure that isolation is high.

For solving above-mentioned technical problem, this utility model adopts the following technical scheme that.

A kind of symmetrical expression mimo antenna structure, it includes PCB substrate, and described PCB substrate is provided with Copper clad layers, described copper clad layers offers multiple trap portion, and the copper clad layers between each two trap portion is formed Having feed element, described feed element is by the edge of copper clad layers and the feedback copper that is disposed adjacent with this copper clad layers Layer is constituted, and it is exposed that described trap portion is the PCB substrate in slit shape and this slit, and multiple trap portions are along covering copper Layer edge be uniformly distributed, described trap portion to the center of copper clad layers extend, and described trap portion with cover copper There is predeterminable range in the center of layer.

Preferably, described copper clad layers is the square of a size of 100mm*100mm.

Preferably, the quantity in described trap portion is four, and four notch are not located at four limits of copper clad layers At edge, and described trap portion is extended to center by the edge of copper clad layers.

Preferably, a length of 20mm～30mm in described trap portion, width is 1.5mm～3mm.

Preferably, a length of 25mm in described trap portion, width is 2mm.

Preferably, the edge of described copper clad layers stretches out and is formed with Parasitica, described Parasitica and feedback Electricity portion is disposed adjacent.

Preferably, described current feed department is L-shaped, and the first support arm of described current feed department prolongs along the edge of PCB substrate Stretching, the second support arm of described current feed department extends to the edge of copper clad layers, and between this second support arm and copper clad layers There is predeterminable range.

In symmetrical expression mimo antenna structure disclosed in this utility model, copper clad layers is offered multiple in slit The trap portion of shape, the copper clad layers between each two trap portion is equipped with a feed element, this feed element conduct Input/output interface uses, and multiple notch are to the extension of the center of copper clad layers and the center with copper clad layers Place keeps predeterminable range, to make the center of copper clad layers keep connection, based on said structure so that MIMO Antenna has good resonance, relatively low return loss and higher isolation.

Accompanying drawing explanation

Fig. 1 is the axonometric chart of this utility model antenna structure.

Fig. 2 is the front view of this utility model antenna structure.

Fig. 3 is the graph of return loss characteristics of this utility model antenna.

Fig. 4 is the isolation performance diagram of this utility model antenna.

Fig. 5 is the isolation performance diagram between two symmetrical antenna unit.

Fig. 6 is the front view of the first mimo antenna in prior art.

Fig. 7 is impedance operator and the isolation performance diagram of the first mimo antenna in prior art.

Fig. 8 is the front view of the second mimo antenna in prior art.

Fig. 9 is impedance operator and the isolation performance diagram of the second mimo antenna in prior art.

Detailed description of the invention

With embodiment, this utility model is described in more detail below in conjunction with the accompanying drawings.

The utility model discloses a kind of symmetrical expression mimo antenna structure, shown in Fig. 1 and Fig. 2, its Including PCB substrate 1, described PCB substrate 1 is provided with copper clad layers 2, and described copper clad layers 2 offers Multiple trap portions 3, the copper clad layers 2 between each two trap portion 3 is formed feed element 4, described feed Unit 4 is made up of the edge of copper clad layers 2 and the feedback copper layer 40 that is disposed adjacent with this copper clad layers 2, described The trap portion 3 PCB substrate 1 in slit shape and in this slit is exposed, and multiple trap portions 3 are along copper clad layers 2 Edge is uniformly distributed, described trap portion 3 to the center of copper clad layers 2 extend, and described trap portion 3 with cover There is predeterminable range in the center of layers of copper 2.

In above-mentioned mimo antenna structure, copper clad layers 2 is offered multiple trap portion 3 in slit shape, often Copper clad layers 2 between two trap portions 3 is equipped with a feed element 4, and this feed element 4 is as input and output Interface uses, and multiple trap portions 3 are respectively to the extension of the center of copper clad layers 2 and the center with copper clad layers 2 Keep predeterminable range, to make the center of copper clad layers 2 keep connection, based on said structure so that MIMO Antenna has good resonance, relatively low return loss and higher isolation.

In the present embodiment, described copper clad layers 2 is the square of a size of 100mm*100mm.Described trap The quantity in portion 3 is four, and four trap portions 3 are respectively arranged on four edges of copper clad layers 2, and described sunken Ripple portion 3 is extended to center by the edge of copper clad layers 2.

Further, a length of 20mm～30mm in described trap portion 3, width is 1.5mm～3mm. Preferred size is: a length of 25mm in described trap portion 3, and width is 2mm.The above-mentioned chi in trap portion 3 Very little 1/4 wavelength close to antenna, it is possible to playing and improve the effect of current reflux between antenna, suppression energy is in heterodoxy Mouth is assembled.Above-mentioned mimo antenna has following characteristic through testing:

The return loss characteristic curve of this utility model antenna is as it is shown on figure 3, amount to 4 return losses in figure Data, i.e. S11/S22/S33/S44, owing to the structure of 4 antenna elements is identical, so 4 groups of data Value is the same, can be seen that each antenna all achieves good resonance from data, return loss low frequency 2.4～ 2.5GHz is respectively less than-8dB, high frequency 5.1GHz～5.9GHz and is respectively less than-10dB.

The isolation characteristic curve of this utility model antenna as shown in Figure 4, isolation amounts to and 12 groups of numbers occurs According to, wherein, S21/S12/S23/S32/34/S43/S41/S14 is the isolation between adjacent antenna, due to 4 The structures of individual antenna element etc. are the most identical, so these 8 groups of data are also consistent, and wherein low frequency isolation degree Less than-25dB, high-frequency isolation degree is less than-17dB.

Wherein, the isolation characteristic curve between two symmetrical antenna unit is as it is shown in figure 5,4 groups of data are S13/S31/S42/S24, reaction is the isolation data between 2 symmetrical antenna elements, from data Going out, the isolation of 2.4GHz～the 2.5GHz isolation less than-20dB, 5.1GHz～5.9GHz is less than-23dB, Wherein, isolation index is within target frequency bands is all at-17dB, and low frequency isolation degree is less than-20dB, thus reaches Arrive higher isolation performance.

As a kind of optimal way, described PCB substrate 1 is FR4 base material, and its dielectric constant is 4.3.

Further, the edge of described copper clad layers 2 stretches out and is formed with Parasitica 5, described Parasitica 5 are disposed adjacent with current feed department 40.Described current feed department 40 is L-shaped, the first support arm edge of described current feed department 40 The edge of PCB substrate 1 extends, and the second support arm of described current feed department 40 extends to the edge of copper clad layers 2, and Predeterminable range is there is between this second support arm and copper clad layers 2.This structure contributes to carrying out feed element electrically Connect.

Symmetrical expression mimo antenna structure disclosed in this utility model, it belongs to 4 antenna sets mould assembly structures, 2.4G and 5G two-band be respectively provided with higher isolation, this utility model can guarantee WIFI radioactivity On the premise of energy, promote isolation between antennae parameter, and then reach more excellent overall performance.

The above is this utility model preferred embodiment, is not limited to this utility model, all Amendment, equivalent or the improvement etc. made in technical scope of the present utility model, should be included in this reality In the range of novel protection.

Claims

1. a symmetrical expression mimo antenna structure, it is characterised in that include PCB substrate, described PCB Base material is provided with copper clad layers, and described copper clad layers offers multiple trap portion, covering between each two trap portion Being formed with feed element in layers of copper, described feed element is by the edge of copper clad layers and adjacent with this copper clad layers sets The feedback copper layer put is constituted, and it is exposed that described trap portion is the PCB substrate in slit shape and this slit, multiple sunken Ripple portion is uniformly distributed along the edge of copper clad layers, and described trap portion extends to the center of copper clad layers, and described sunken Predeterminable range is there is in ripple portion with the center of copper clad layers.

2. symmetrical expression mimo antenna structure as claimed in claim 1, it is characterised in that described copper clad layers It it is the square of a size of 100mm*100mm.

3. symmetrical expression mimo antenna structure as claimed in claim 2, it is characterised in that described trap portion Quantity be four, four notch are not located at four edges of copper clad layers, and described trap portion is by covering The edge of layers of copper extends to center.

4. symmetrical expression mimo antenna structure as claimed in claim 2, it is characterised in that described trap portion A length of 20mm～30mm, width is 1.5mm～3mm.

5. symmetrical expression mimo antenna structure as claimed in claim 4, it is characterised in that described trap portion A length of 25mm, width is 2mm.

6. symmetrical expression mimo antenna structure as claimed in claim 1, it is characterised in that described copper clad layers Edge stretch out and be formed with Parasitica, described Parasitica is disposed adjacent with current feed department.

7. symmetrical expression mimo antenna structure as claimed in claim 1, it is characterised in that described current feed department L-shaped, the first support arm of described current feed department extends along the edge of PCB substrate, second of described current feed department Arm extends to the edge of copper clad layers, and there is predeterminable range between this second support arm and copper clad layers.