CN111293437A - 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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- CN111293437A CN111293437A CN202010197169.6A CN202010197169A CN111293437A CN 111293437 A CN111293437 A CN 111293437A CN 202010197169 A CN202010197169 A CN 202010197169A CN 111293437 A CN111293437 A CN 111293437A
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- coplanar waveguide
- mimo antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
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Abstract
The invention relates to a coplanar waveguide feed high-isolation ultra-wideband MIMO antenna, which comprises a substrate, an antenna and a grounding plate, wherein the antenna comprises two radiation units, each radiation unit contains a circular monopole UWB antenna, and the two circular monopole UWB antennas are vertical to each other. Compared with the prior art, the invention has the advantages of simple manufacture and compact structure, eliminates the winding, the via hole and the corresponding parasitic source inductance, reduces the radiation loss caused by surface waves, increases the antenna gain and has the characteristic of high isolation.
Description
Technical Field
The invention relates to a wireless communication antenna, in particular to a coplanar waveguide fed high-isolation ultra-wideband MIMO antenna.
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.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a coplanar waveguide fed ultra-wideband MIMO antenna with high isolation.
The purpose of the invention can be realized by 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 invention has the following advantages:
(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 invention is described in detail below with reference to the figures and specific embodiments. The present 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 high isolation ultra wide band 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 |
|---|---|---|---|
| CN202010197169.6A CN111293437A (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 |
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| CN202010197169.6A CN111293437A (en) | 2020-03-19 | 2020-03-19 | Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna |
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| CN111293437A true CN111293437A (en) | 2020-06-16 |
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| CN202010197169.6A Pending CN111293437A (en) | 2020-03-19 | 2020-03-19 | Coplanar waveguide feed high-isolation ultra-wideband MIMO antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112490666A (en) * | 2020-11-20 | 2021-03-12 | 榆林学院 | Two-unit folding short-circuit monopole MIMO antenna with broadband loading circular patch |
| CN115064861A (en) * | 2022-06-22 | 2022-09-16 | 九井互联(北京)数字技术有限公司 | USB wireless data transmission terminal with ultra-wideband antenna |
-
2020
- 2020-03-19 CN CN202010197169.6A patent/CN111293437A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112490666A (en) * | 2020-11-20 | 2021-03-12 | 榆林学院 | Two-unit folding short-circuit monopole MIMO antenna with broadband loading circular patch |
| CN112490666B (en) * | 2020-11-20 | 2024-03-29 | 榆林市保昌科技有限公司 | Two-unit folding short-circuit monopole MIMO antenna with broadband loaded with round patch |
| CN115064861A (en) * | 2022-06-22 | 2022-09-16 | 九井互联(北京)数字技术有限公司 | USB wireless data transmission terminal with ultra-wideband antenna |
| CN115064861B (en) * | 2022-06-22 | 2023-01-10 | 九井互联(北京)数字技术有限公司 | USB wireless data transmission terminal with ultra-wideband antenna |
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