CN211743404U - Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna - Google Patents
Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna Download PDFInfo
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- CN211743404U CN211743404U CN202020354431.9U CN202020354431U CN211743404U CN 211743404 U CN211743404 U CN 211743404U CN 202020354431 U CN202020354431 U CN 202020354431U CN 211743404 U CN211743404 U CN 211743404U
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- 238000002955 isolation Methods 0.000 title claims abstract description 36
- 230000005404 monopole Effects 0.000 claims abstract description 16
- 230000005855 radiation Effects 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 3
- 230000003071 parasitic effect Effects 0.000 abstract description 2
- 238000004804 winding Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 13
- 230000010287 polarization Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
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- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
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Abstract
The utility model relates to a high isolation ultra wide band MIMO antenna of coplane waveguide feed, including base plate, antenna and ground plate, the antenna include two radiating element, contain a circular monopole UWB antenna in each radiating element, two circular monopole UWB antenna mutually perpendicular. Compared with the prior art, the utility model discloses make simply, compact structure has cancelled wire winding, via hole and corresponding parasitic source inductance, has reduced the radiation loss that the surface wave caused, has increased antenna gain, has the high isolation characteristic.
Description
Technical Field
The utility model relates to a wireless communication antenna especially relates to a high isolation ultra wide band MIMO antenna of coplane waveguide feed.
Background
In 2002, 2 months, the Federal Communications Commission (FCC) of the united states formulated civilization specifications for ultra-wideband (UWB) technology, formally determined the band range of 3.1GHz-10.6GHz as ultra-wideband, and gradually opened the civilized communication field. The UWB technology has the characteristics of large system capacity, strong multipath fading resistance, high communication rate, low interception rate, strong signal penetration capacity, high communication quality, low power consumption, low system complexity, low cost and the like. UWB technology has been widely used in the fields of imaging, radar, communications, and the like.
The antenna is used as an important component of a radio frequency front end, conversion of guided waves and free space waves is achieved, and performance of the antenna directly influences communication quality. Therefore, it is necessary to develop a research for the ultra-wideband antenna in the whole ultra-wideband communication system. By using a Multiple Input Multiple Output (MIMO) technology, the spectrum utilization rate can be greatly improved and the communication quality can be improved without increasing spectrum resources. The MIMO technology is to use multiple sets of antennas at a transmitting end and a receiving end of a communication system, respectively, so that communication signals are transmitted and received by using the multiple sets of antennas at the transmitting end and the receiving end of the communication system, thereby improving communication quality. With the development of mobile communication devices, mobile communication devices are increasingly developing in miniaturization, multi-functionalization and intellectualization. How to maintain various performances of the antenna in a limited space range is an important research subject, and in the MIMO antenna system, it is necessary to overcome the problem that mutual coupling between antenna units is strengthened and the overall performance of the antenna is affected due to too small pitch of the antenna units, so that it is an important subject to improve the isolation of the ultra-wideband MIMO antenna and reduce the mutual coupling of the antenna.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a coplanar waveguide fed ultra-wideband MIMO antenna with high isolation, which overcomes the above-mentioned drawbacks of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
the antenna comprises two radiation units, wherein each radiation unit comprises a circular monopole UWB antenna, and the two circular monopole UWB antennas are perpendicular to each other.
And an isolation branch is arranged between the two circular monopole UWB antennas.
The antenna and the isolation branch are in axial symmetry structures, and the symmetry axis is the axis of the isolation branch.
The isolation branch is integrally strip-shaped, and a branch is arranged at one end of the isolation branch close to the circular patch of the circular monopole antenna.
The branches are V-shaped.
The whole shape of the antenna is an irregular hexagon formed by cutting two opposite angles of a square.
The substrate material is FR 4.
The dielectric constant of the substrate is 4.4, and the thickness of the substrate is 0.8 mm.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the feeding mode of the coplanar waveguide is adopted, which is different from other feeding modes of side feeding and coaxial feeding, the feeding mode of the coplanar waveguide can reduce the dispersion effect, has simple manufacture and compact structure, cancels winding wires, via holes and corresponding parasitic source inductance, reduces the radiation loss caused by surface waves and increases the antenna gain; in addition, the size of the coplanar waveguide feed antenna can be flexibly adjusted according to actual requirements.
(2) The antenna vertically arranges two linearly polarized antennas in a polarization diversity mode to form vertical polarization and horizontal polarization, so that the independence of received signals is stronger due to the polarization mismatch of electromagnetic waves with different polarizations; the CPW structure cuts out part of the coplanar ground and has lower coupling; the isolated branch can counteract the induced current generated by the coupling of the excitation end on the non-excitation end. The antenna achieves the characteristic of high isolation due to the three main reasons, and the simulation results of the isolation degree S21/S12 of the antenna are all lower than-22 dB in an ultra-wideband range.
(3) The radiation unit of the antenna is designed on the basis of a common circular monopole UWB antenna, the antenna unit is vertically placed, and the structure of the branch is loaded, so that a target antenna is finally designed, the material adopts an economical FR4 material, the size is small, the whole antenna is simple in structure and easy to process.
Drawings
Fig. 1 is a schematic structural diagram of an antenna according to the present embodiment;
FIG. 2 shows the return loss (S) of the antenna of this embodiment11) Parameter simulation results;
FIG. 3 shows the isolation (S) of the antenna of this embodiment21) And (5) parameter simulation results.
Reference numerals:
1 is a radiation unit; 2 is an isolated branch knot; and 3, a grounding plate.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
As shown in fig. 1, the coplanar waveguide fed high-isolation ultra-wideband MIMO antenna comprises a substrate, an antenna and a ground plate, wherein the antenna comprises two radiation units 1, each radiation unit 1 contains a circular monopole UWB antenna, and the two circular monopole UWB antennas are perpendicular to each other.
An isolation branch 2 is arranged between the two round monopole UWB antennas.
The antenna and the isolation branch 2 are both in an axisymmetric structure, and the symmetric axis is the axis of the isolation branch 2.
The isolation branch 2 is integrally strip-shaped, and a V-shaped branch is arranged at one end of the isolation branch 2 close to the circular patch of the circular monopole antenna.
The overall shape of the antenna is an irregular hexagon formed by cutting two opposite angles of a square.
In the embodiment, FR4 with a dielectric constant of 4.4 and a thickness of 0.8mm is used as a dielectric substrate, and a circular patch is used for increasing a current circulation path and expanding bandwidth, a circular monopole UWB antenna is vertically placed on the dielectric substrate, high isolation is achieved by using methods of polarization diversity and branch section 2 isolation, parts are cut in a coplanar manner, and coupling between antenna units is reduced. Finally, a Coplanar Waveguide (CPW) fed high-isolation ultra-wideband MIMO antenna is designed.
As shown in fig. 2 and 3, the operating range (S) of the antenna11<-10) UWB (3.1-10.6GHz) band covering 2.92-12 GHz; port isolation S21Within the working range, the isolation is less than-22 dB and far greater than the basic requirement, and the isolation is high.
Claims (8)
1. The coplanar waveguide feed high-isolation ultra-wideband MIMO antenna comprises a substrate, an antenna and a ground plate, and is characterized in that the antenna comprises two radiation units, each radiation unit contains a circular monopole UWB antenna, and the two circular monopole UWB antennas are perpendicular to each other.
2. The coplanar waveguide fed ultra-wideband MIMO antenna as claimed in claim 1, wherein an isolation branch is provided between the two circular monopole UWB antennas.
3. The coplanar waveguide fed high-isolation ultra-wideband MIMO antenna as claimed in claim 2, wherein the antenna and the isolation stub are both axisymmetric structures, and the axis of symmetry is the axis of the isolation stub.
4. The coplanar waveguide fed high-isolation ultra-wideband MIMO antenna as claimed in claim 2, wherein the isolation branch is strip-shaped as a whole, and a branch is provided at one end of the isolation branch close to the circular patch of the circular monopole antenna.
5. A coplanar waveguide fed UWB MIMO antenna as claimed in claim 4 wherein the branches are V-shaped.
6. The coplanar waveguide fed ultra-wideband MIMO antenna as claimed in claim 1, wherein the overall shape of the antenna is a square with two opposite corners removed to form an irregular hexagon.
7. The coplanar waveguide fed ultra-wideband MIMO antenna with high isolation as claimed in claim 1, wherein the substrate material is FR 4.
8. The coplanar waveguide fed ultra-wideband MIMO antenna as claimed in claim 7, wherein the substrate has a dielectric constant of 4.4 and a thickness of 0.8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020354431.9U CN211743404U (en) | 2020-03-19 | 2020-03-19 | Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020354431.9U CN211743404U (en) | 2020-03-19 | 2020-03-19 | Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna |
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| CN211743404U true CN211743404U (en) | 2020-10-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293437A (en) * | 2020-03-19 | 2020-06-16 | 上海电力大学 | Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293437A (en) * | 2020-03-19 | 2020-06-16 | 上海电力大学 | Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna |
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