CN108429010B - Ultra-wideband double-end-fire antenna based on modulation super-surface - Google Patents
Ultra-wideband double-end-fire antenna based on modulation super-surface Download PDFInfo
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- CN108429010B CN108429010B CN201810313073.4A CN201810313073A CN108429010B CN 108429010 B CN108429010 B CN 108429010B CN 201810313073 A CN201810313073 A CN 201810313073A CN 108429010 B CN108429010 B CN 108429010B
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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
- 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
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Abstract
The invention relates to an ultra-wideband dual-transmission antenna based on a modulated super surface, and belongs to the technical field of antennas. The antenna comprises a surface wave launcher, a surface wave waveguide, a dielectric substrate and a coaxial line, wherein the surface wave launcher is partially arranged on the dielectric substrate and comprises a planar dipole; the surface wave waveguide part is arranged on the dielectric substrate and comprises patches with various sizes and the same unit period; the coaxial line comprises an inner core, a dielectric layer and an outer conductor, wherein the inner core is connected with one arm of the planar dipole, and the outer conductor of the feeder is connected with the other arm of the planar dipole. The invention has wide bandwidth, double-end emission, high gain, high radiation efficiency, simple structure and low profile height.
Description
Technical Field
The invention belongs to the technical field of antennas, and relates to an ultra-wideband double-ended antenna based on a modulated super surface.
Background
With the increasing change of wireless communication technology, surface wave antennas have been popular as a novel antenna structure. Different from the radiation principle of the traditional antenna which is propagated and radiated simultaneously, the surface wave antenna is an antenna which can guide waves to propagate on the surface without radiating, and only when the structure of the surface wave antenna is changed, the surface waves can be cut off to generate radiation. At present, the super-surface antenna is widely used in radar antennas, aircraft surface antennas and antenna modules of communication systems due to the characteristics of low profile height, easiness in conformal, strong concealment, small air resistance, simple structure, high gain and the like. The traditional surface wave antenna is realized by utilizing a ripple metal surface, and the structure causes the antenna to be not only thick and heavy, but also high in cost.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an ultra-wideband dual-port antenna based on a modulated super-surface, wherein the antenna based on the surface wave propagation characteristic has the characteristics of wide bandwidth, dual-port, high gain, high radiation efficiency, simple structure, and low profile height.
In order to achieve the purpose, the invention provides the following technical scheme:
an ultra-wideband double-ended-emitting antenna based on a modulated super-surface comprises a surface wave emitter, a surface wave waveguide, a dielectric substrate and a coaxial line;
the surface of the dielectric substrate is rectangular, and the coaxial line is arranged at the central position of the dielectric substrate;
the surface wave launcher is arranged on the medium substrate, the surface wave launcher comprises a plane dipole, the plane dipole is arranged in the middle of the whole medium substrate, and the plane dipole is in mirror symmetry with the coaxial line;
the surface wave waveguide is arranged on two sides of the medium substrate and comprises patches with various sizes and the same unit period, and the patch arrangement of the surface wave waveguide is in mirror symmetry with respect to the coaxial line.
Further, the coaxial line comprises an inner core, a dielectric layer and an outer conductor, the inner core is connected with one arm of the planar dipole, and the outer conductor of the feeder is connected with the other arm of the planar dipole.
Furthermore, the length of the dielectric substrate is 105 mm-110 mm, the width of the dielectric substrate is 60 mm-65 mm, and the thickness of the dielectric substrate is 0.8 mm-1.2 mm.
Further, one side of the planar dipole is of a stepped structure, wherein the width of a first step is 5-10 mm, the width of a second step is 15-20 mm, the length of the first step is 0.5-1 mm, the length of the second step is 2-2.5 mm, the length of the third step is 10-15 mm, and the thickness of the third step is 0.1-0.15 mm.
Furthermore, one side of the planar dipole is of a semicircular structure, and the radius of the semicircle is 10 mm-15 mm.
Further, the surface wave waveguide comprises four patches with different sizes and same unit period, wherein:
the size of the patch I is 7.5 mm-8 mm, and the patch I is arranged in the middle of two sides of the dielectric substrate;
the size of the patch II is 7 mm-7.5 mm, the patch II is arranged on two sides of the patch I, and the number of the patch II is twice that of the patch I;
the size of the patch III is 6.5 mm-7 mm, the patch III is arranged on two sides of the patch II, and the number of the patches III is equal to that of the patch II;
the size of the patch IV is 5 mm-5.5 mm, and the patch IV surrounds the patch I, the patch II and the patch III on three sides.
The invention has the beneficial effects that: the invention realizes the directional diagram of double end-fire by adjusting the refractive index of the periodic patch and arranging the relative positions of the patch and the dipole, and has the ultra-wideband impedance matching phenomenon, high radiation efficiency and high end-fire peak gain.
Besides the advantages, the invention also has the advantages of simple structure, easy manufacture, low profile height and the like. Therefore, the method can collect wireless energy at a terminal of a complex wireless communication system, has higher signal-to-noise ratio and weakens corresponding transmission loss, and is applied to communication systems of WLAN and WiMAX frequency bands.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is an overall schematic diagram of an antenna of the present invention;
fig. 2 is a top view of the antenna of the present invention;
FIG. 3 is a side view of the antenna of the present invention;
FIG. 4 is a corresponding relationship between the equivalent refractive index of the patch-shaped unit and the size of the patches according to the present invention;
FIG. 5 is a graph of voltage standing wave coefficient ratio (VSER) versus frequency for the present invention;
FIG. 6 is a graph of gain in the endfire direction versus frequency of the present invention;
FIG. 7 is the E-plane and H-plane radiation patterns of the present invention at 2GHz frequency;
FIG. 8 is the E-plane and H-plane radiation patterns of the present invention at 3GHz frequency;
FIG. 9 shows the E-plane and H-plane radiation patterns of the present invention at 4GHz frequency;
FIG. 10 shows the E-plane and H-plane radiation patterns of the present invention at 5GHz frequency;
FIG. 11 shows the radiation patterns of the E-plane and the H-plane of the present invention at the frequency point of 5.6 GHz;
wherein: 1-planar dipole, 2-patch, 3-coaxial line, 4-dielectric substrate.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is an overall schematic diagram of the antenna of the present invention, as shown in fig. 1: the invention discloses an ultra-wideband double-ended-emitting antenna based on a modulated super-surface.
Wherein the surface wave transmitter portion is disposed above the dielectric substrate and comprises an ultra-wideband planar dipole; the surface wave waveguide part is arranged on the dielectric substrate, comprises patches with various sizes (refractive indexes) and the same unit period, and guides surface waves to propagate on the surface, so that the antenna has good impedance matching characteristics in a frequency band of 1.85-5.65 GHz.
The periodic patches on the upper surface of the dielectric substrate are symmetrically arranged on two sides of the planar dipole according to a certain rule, and the periodic patches effectively guide the propagation direction of surface waves by virtue of the arrangement of the equivalent refractive indexes of the periodic patches, so that the omnidirectional directional pattern of the planar dipole is changed into a radiation directional pattern with double end-fire. We find that this scheme of using the super-surface can not only expand the bandwidth of the planar dipole, but also maintain the antenna with good high-gain performance within a certain range.
The dielectric substrate is a thin cuboid substrate, in the embodiment, the length l of the dielectric substrate is 63mm, the width w of the dielectric substrate is 108mm, the thickness h of the dielectric substrate is 1mm, the material type is TACONIC CER-10, the relative dielectric constant is 10, the relative magnetic conductivity is 1.0, the loss tangent is 0.035, and the planar dipole and the periodic patch structure on the upper surface of the dielectric substrate are copper-clad films with the same thickness.
The following examples are intended to illustrate specific embodiments of the present invention.
See fig. 1, 2, 3. The dipole antenna comprises a 1-plane dipole, 2-periodic patches arranged according to a certain rule, a 3-coaxial line and a 4-dielectric substrate. The upper surface of the dielectric substrate 4 is tightly attached to the planar dipole 1 and the periodic patches 2, the inner core of the coaxial line 3 is connected with one arm of the planar dipole, and the outer conductor of the feeder line is connected with the other arm of the planar dipole. The dielectric substrate 4 is a thin cuboid which is l in length, w in width and h in thickness, is made of a material with the model of TACONIC CER-10, and has the relative dielectric constant of 10, the relative magnetic conductivity of 1.0 and the loss tangent of 0.035.
After the initial design is completed, simulation analysis is performed by using high-frequency electromagnetic simulation software HFSS16.0, and the dimensions of various parameters obtained after simulation optimization are shown in Table 1:
TABLE 1 table of optimum dimensions for various parameters of the invention
According to the parameters, the characteristic parameters such as Voltage Standing Wave Ratio (VSWR) and directional radiation gain of the designed ultra-wideband double-ended transmitting antenna based on the modulation super-surface are simulated and analyzed by using HFSS16.0, and the analysis result is as follows:
FIG. 4 is a graph showing the variation of the equivalent refractive index of the patch-shaped unit of the present invention and the size between the patches
Wherein n isswDenotes the equivalent refractive index, nswRanges between 1.1 and 1.45.
Fig. 5 is a graph of voltage standing wave coefficient ratio (VSWR) versus frequency for the present invention, with the impedance bandwidth of the present antenna ranging from 1.85-5.65GHz when the VSWR of the antenna is < 2.
FIG. 6 is a graph of gain versus frequency for the endfire direction of the present invention, ranging from 2.1dBi to 7.32dBi for bandwidths of 1.85-5.65 GHz.
7-11 are radiation patterns of the present invention at five frequency points, 2GHz, 3GHz, 4GHz, 5GHz and 5.6GHz, where it can be seen that at low frequencies, the antenna exhibits an omnidirectional pattern of dipoles; along with the increase of the frequency, the antenna directional diagram gradually becomes the dual-end radiation characteristic, and the good dual-end radiation phenomenon is kept in a certain frequency band.
In summary, the antenna has a low profile, a frequency coverage range from 1.85GHz to 5.65GHz, effectively covers a WLAN low frequency band (2.4/5.2/5.8GHz) and a WiMAX frequency band (2.5/3.5/5.5GHz), and has a good voltage standing wave characteristic and a good and stable radiation pattern.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides an ultra wide band bijection antenna based on super surface of modulation which characterized in that: the antenna comprises a surface wave launcher, a surface wave waveguide, a medium substrate and a coaxial line;
the surface of the dielectric substrate is rectangular, and the coaxial line is arranged at the central position of the dielectric substrate;
the surface wave launcher is arranged on the medium substrate, the surface wave launcher comprises a plane dipole, the plane dipole is arranged in the middle of the whole medium substrate, and the plane dipole is in mirror symmetry with the coaxial line;
the surface wave waveguide is arranged on two sides of the medium substrate, the surface wave waveguide comprises patches with various sizes and the same unit period, the patch arrangement of the surface wave waveguide is mirror symmetry relative to the coaxial line, and the surface wave waveguide is symmetrically arranged on two sides of the planar dipole along the direction perpendicular to the extension of two arms of the planar dipole;
the surface wave waveguide comprises four patches with different sizes and the same unit period, wherein:
the size of the sub-wavelength patch I is 7.5 mm-8 mm, and the patch I is arranged in the middle of two sides of the dielectric substrate;
the size of the patch II is 7 mm-7.5 mm, the patch II is arranged on two sides of the patch I, and the number of the patch II is twice that of the patch I;
the size of the patch III is 6.5 mm-7 mm, the patch III is arranged on two sides of the patch II, and the number of the patches III is equal to that of the patch II;
the size of a patch IV is 5 mm-5.5 mm, and the patch IV is arranged by surrounding the patch I, the patch II and the patch III on three sides;
the direction in which the sizes of the patch I, the patch II and the patch III are gradually reduced is consistent with the extending direction of the two arms of the planar dipole.
2. The ultra-wideband dual-port antenna based on the modulation super-surface as claimed in claim 1, wherein: the coaxial line comprises an inner core, a dielectric layer and an outer conductor, wherein the inner core is connected with one arm of the planar dipole, and the outer conductor of the feeder is connected with the other arm of the planar dipole.
3. The ultra-wideband dual-port antenna based on the modulation super-surface as claimed in claim 1, wherein: the length of the dielectric substrate is 105 mm-110 mm, the width of the dielectric substrate is 60 mm-65 mm, and the thickness of the dielectric substrate is 0.8 mm-1.2 mm.
4. The ultra-wideband dual-port antenna based on the modulation super-surface as claimed in claim 3, wherein: one side of plane dipole is the stair structure, and wherein, first ladder width is 5mm ~10mm, and second ladder width is 15mm ~20mm, and first ladder length is 0.5mm ~1mm, and second ladder length is 2mm ~2.5mm, and third ladder length is 10mm ~15mm, and thickness is 0.1mm ~0.15 mm.
5. The ultra-wideband dual-port antenna based on the modulation super-surface as claimed in claim 4, wherein: one side of the planar dipole is of a semicircular structure, and the radius of the semicircle is 10 mm-15 mm.
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| CN201810313073.4A CN108429010B (en) | 2018-04-09 | 2018-04-09 | Ultra-wideband double-end-fire antenna based on modulation super-surface |
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| CN108429010B true CN108429010B (en) | 2020-03-17 |
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| CN109326878B (en) * | 2018-10-11 | 2019-10-08 | 西南交通大学 | A kind of broadband end-on-fire antenna based on surface wave guide and high impedance surface |
| KR102207150B1 (en) * | 2019-06-26 | 2021-01-25 | 삼성전기주식회사 | Antenna apparatus |
| CN112366456A (en) * | 2020-11-02 | 2021-02-12 | 合肥学院 | 5G communication is with ultra wide band antenna based on artifical electromagnetism metamaterial |
| CN117353007B (en) * | 2023-11-02 | 2024-07-02 | 南通大学 | Vertical polarization bidirectional radiation antenna |
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| CN105789906A (en) * | 2016-03-03 | 2016-07-20 | 电子科技大学 | 2D phase gradient super-surface composite structure |
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| WO2001071849A2 (en) * | 2000-03-20 | 2001-09-27 | Sarnoff Corporation | Reconfigurable antenna |
| CN105244615B (en) * | 2015-11-04 | 2018-04-13 | 南京信息工程大学 | A kind of ultra wide band transparent antenna |
| CN106785405A (en) * | 2017-01-12 | 2017-05-31 | 重庆邮电大学 | A kind of low section dual polarization dipole subbase station antenna of loading AMC reflecting plates |
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| CN105789906A (en) * | 2016-03-03 | 2016-07-20 | 电子科技大学 | 2D phase gradient super-surface composite structure |
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