CN113839216B - Low-profile broadband circularly polarized antenna based on super surface - Google Patents
Low-profile broadband circularly polarized antenna based on super surface Download PDFInfo
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- CN113839216B CN113839216B CN202111121714.4A CN202111121714A CN113839216B CN 113839216 B CN113839216 B CN 113839216B CN 202111121714 A CN202111121714 A CN 202111121714A CN 113839216 B CN113839216 B CN 113839216B
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- 239000000758 substrate Substances 0.000 claims abstract description 50
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000004891 communication Methods 0.000 abstract description 10
- 230000005855 radiation Effects 0.000 abstract description 10
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000010287 polarization Effects 0.000 description 9
- 239000010410 layer Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002355 dual-layer Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
-
- 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
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
Abstract
The invention discloses a low-profile broadband circularly polarized antenna based on a super surface, relates to the technical field of antennas in comprehensive design of communication systems, and solves the technical problems of narrow bandwidth and high profile of the circularly polarized antenna of the conventional wireless communication system. The invention comprises a first substrate and a second substrate; the super surface is arranged on the upper surface of the first substrate, 4 multiplied by 4 square patches are symmetrically arranged, and a Z-shaped gap is etched in the center of each patch; the grounding plate is arranged on the upper surface of the second substrate, and the center of the grounding plate is etched with an inclined cross-shaped gap with different lengths; the microstrip feeder is arranged on the lower surface of the second substrate and is of a stepped structure. The super-surface is excited by adopting a slot coupling mode, and the resonant mode of the slot antenna and the resonant mode of the super-surface are combined together to realize broadband circularly polarized radiation. The invention can work in the C-band (3.7-4.2 GHz) frequency band, has simple structure, low cost and easy processing, meets the requirements of low profile and wide frequency band of the antenna of the wireless communication system, and has higher engineering practical value.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a low-profile broadband circularly polarized antenna based on a super surface.
Background
With the continuous acceleration of the progress of social informatization, the superiority of wireless communication is increasingly revealed. The performance of the antenna as an electromagnetic wave receiving and transmitting device directly influences the quality and efficiency of wireless communication. Circular polarized antennas are widely used because of their strong multipath interference and fading resistance, such as hand-held portable devices, wireless sensors, and global navigation satellite systems. The traditional circularly polarized microstrip antenna has a simple structure and a narrower axial ratio bandwidth, and cannot meet the requirements of high transmission rate and high channel capacity. The super surface is used as a two-dimensional metamaterial, and can improve the performances of bandwidth, gain and the like of the antenna when being applied to microstrip antenna design.
In recent years, a circularly polarized antenna based on a super surface has attracted a lot of attention. Various designs of circularly polarized antennas based on the super surface are proposed by students at home and abroad, such as adopting a plurality of resonance modes of the super surface or combining the super surface with the resonance mode of the feed structure to realize broadband circular polarization, but the common disadvantages of the designs are poor performance of the antenna, and the design is particularly characterized by high section of the antenna and narrow bandwidth of the circularly polarized axis.
How to design a circular polarized antenna with low profile and broadband performance is a technical problem to be solved. Therefore, research on the low-profile broadband circularly polarized antenna based on the super surface is an effective way for solving the technical problems of narrow bandwidth and high profile of the circularly polarized antenna of the wireless communication system.
Disclosure of Invention
Aiming at the technical problems of narrow bandwidth and high profile of a circularly polarized antenna of a wireless communication system, the invention provides a low-profile broadband circularly polarized antenna based on a super-surface.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a low-profile broadband circularly polarized antenna based on a super surface comprises a first substrate and a second substrate; the super surface is arranged on the upper surface of the first substrate, the super surface is a square patch which is 4 multiplied by 4, a Z-shaped gap is etched at the center of the patch, and the Z-shaped gap comprises a vertical gap and two horizontal gaps; the grounding plate is arranged on the upper surface of the second substrate, the center of the grounding plate is etched with inclined cross-shaped gaps with different lengths, the long gaps of the cross-shaped gaps are in the direction of-45 degrees, and the short gaps are in the direction of 45 degrees; the microstrip feeder is arranged on the lower surface of the second substrate, is of a stepped structure and comprises a first microstrip line and a second microstrip line.
Further, the first substrate and the second substrate are rectangular dielectric substrates.
Further, the first substrate and the second substrate are made of FR4 epoxy resin material with dielectric constant of 4.4, and the thicknesses of the first substrate and the second substrate are 3.2mm and 0.8mm respectively.
Further, the first substrate and the second substrate have dimensions of 55mm×55mm.
Further, the side length of the super-surface square patch is 11mm, and the patch spacing is 0.8mm; the size of the vertical gap in the Z-shaped gap is 2.6mm×0.6mm, and the size of the two horizontal gaps is 1.3mm×0.6mm.
Further, the size of the grounding plate is 55mm×55mm; the center of the grounding plate is etched with inclined cross-shaped gaps with unequal lengths, the sizes of the long gaps in the cross-shaped gaps are 24.4mm multiplied by 1.4mm, and the sizes of the short gaps are 14.4mm multiplied by 1.4mm.
Further, the microstrip feeder is of a stepped feeder structure; the first microstrip line has dimensions of 16mm by 1mm, and the second microstrip line has dimensions of 16mm by 1.5mm.
On one hand, the center of the grounding plate is etched with an inclined unequal-length cross-shaped slot, and a long slot and a short slot of the inclined unequal-length cross-shaped slot generate a 90-degree phase difference, so that the slot antenna realizes circularly polarized radiation. On the other hand, the super-surface unit is etched with a Z-shaped gap, and two electric field components with equal amplitude and 90-degree phase difference are introduced into the horizontal and vertical gaps, so that the super-surface has circular polarization performance. In addition, the bandwidth of the antenna increases as the thickness of the dielectric substrate increases, and it is difficult to achieve broadband performance while maintaining a low profile. According to the invention, the super surface is excited by the inclined cross-shaped slot in the center of the grounding plate, the resonance mode of the slot antenna and the resonance mode of the super surface are combined together to realize the broadband circular polarization performance, and under the condition that the total thickness of two layers of substrates is 4mm, the circular polarization bandwidth of 27.1% is obtained, and the broadband circular polarization antenna has low profile and broadband performance. The invention solves the technical problems of narrow bandwidth and high profile of the circularly polarized antenna of the wireless communication system.
Compared with the prior art, the invention has the following advantages:
1. the super-surface unit etches a Z-shaped gap, so that the circular polarization bandwidth of the antenna is improved;
2. the resonance mode of the slot antenna and the resonance mode of the super surface jointly realize broadband circularly polarized radiation;
3. according to the invention, under the condition that the total thickness of the two layers of substrates is 4mm, 27.1% of circular polarization bandwidth is obtained, and the dual-layer substrate has low profile and broadband performance;
4. the invention can work in the C-band (3.7-4.2 GHz) frequency band of a satellite communication system, has simple antenna structure, low cost and easy processing and manufacturing, and provides an effective solution for low-profile and broadband circularly polarized radiation of the antenna of the wireless communication system.
Drawings
FIG. 1 is a schematic diagram of a low-profile wideband circularly polarized antenna according to the present invention;
FIG. 2 is a diagram of the S-parameters of a low-profile wideband circularly polarized antenna of the present invention;
FIG. 3 is an axial ratio of a low-profile wideband circularly polarized antenna of the present invention;
FIG. 4 is a radiation pattern at 3.75GHz for a low-profile broadband circularly polarized antenna of the present invention;
FIG. 5 is a radiation pattern at 4.2GHz for the low-profile broadband circularly polarized antenna of the present invention;
FIG. 6 is a radiation pattern at 4.65GHz for the low-profile broadband circularly polarized antenna of the present invention;
fig. 7 shows the gain of the low-profile wideband circularly polarized antenna of the present invention.
The micro-strip feed line comprises a 1-first substrate, a 2-second substrate, a 3-super surface, a 4-Z-shaped gap, a 41-vertical gap, a 42-horizontal gap, a 5-grounding plate, a 6-cross-shaped gap, a 61-long gap, a 62-short gap and a 7-micro-strip feed line.
Detailed Description
Example 1
As shown in fig. 1, the invention is a low-profile broadband circularly polarized antenna based on a super surface, comprising a first substrate 1 and a second substrate 2; the super surface 3 is arranged on the upper surface of the first substrate 1, the super surface 3 is a square patch which is distributed in a 4 multiplied by 4 way, a Z-shaped gap 4 is etched at the center of the patch, and the Z-shaped gap 4 comprises a vertical gap 41 and two horizontal gaps 42; the grounding plate 5 is arranged on the upper surface of the second substrate 2, the center of the grounding plate 5 is etched with an inclined unequal-length cross-shaped gap 6, the long gap 61 of the cross-shaped gap 6 is along the direction of-45 degrees, and the short gap 62 is along the direction of 45 degrees; the microstrip feeder 7 is disposed on the lower surface of the second substrate 2, and the microstrip feeder 7 has a stepped structure and includes a first microstrip line and a second microstrip line.
Further, the first substrate 1 and the second substrate 2 are rectangular dielectric substrates.
Further, the first substrate 1 and the second substrate 2 are made of FR4 epoxy resin material with a dielectric constant of 4.4, and the thickness is 3.2mm and 0.8mm, respectively.
Further, the first substrate 1 and the second substrate 2 have dimensions of 55mm×55mm.
Further, the side length of the super surface 3 square patch is 11mm, and the patch spacing is 0.8mm; the size of the vertical slit 41 in the zigzag slit 4 is 2.6mm×0.6mm, and the size of both horizontal slits 42 is 1.3mm×0.6mm.
Further, the size of the ground plate 5 is 55mm×55mm; the center of the grounding plate 5 is etched with an inclined cross-shaped gap 6 with unequal length, the long gap 61 in the cross-shaped gap 6 has the size of 24.4mm multiplied by 1.4mm, and the short gap 62 has the size of 14.4mm multiplied by 1.4mm.
Further, the microstrip feeder 7 is a stepped feeder structure; the first microstrip line has dimensions of 16mm by 1mm, and the second microstrip line has dimensions of 16mm by 1.5mm.
The advantages of the invention can be further illustrated by simulation results. Modeling analysis was performed on the low-profile wideband circularly polarized antenna based on the super surface in the above embodiment. The Z-shaped gap of the super surface and the cross-shaped gap of the grounding plate respectively introduce two electric field components with equal amplitude and 90 DEG phase difference, thereby realizing circularly polarized radiation. The super-surface is excited by adopting a slot coupling mode, and the resonance mode of the slot antenna and the resonance mode of the super-surface are combined together to realize broadband performance. The invention obtains 27.1% circular polarization bandwidth under the condition that the total thickness of the two layers of substrates is 4mm, and has low profile and broadband performance.
Fig. 2 shows the S-parameters of a low-profile wideband circularly polarized antenna based on a hypersurface according to the invention, wherein the abscissa represents the frequency variation in GHz and the ordinate represents the amplitude variation in dB. As shown, the antenna has a-10 dB impedance bandwidth of 3.44-4.68GHz with a relative bandwidth of 30.5%. Fig. 3 shows the axial ratio of the low-profile wideband circularly polarized antenna based on the super surface according to the present invention. As shown, the antenna has a 3dB axial ratio bandwidth of 3.56-4.74GHz and a relative bandwidth of 28.4%. As can be seen from FIGS. 2 and 3, the operating frequency band of the antenna is 3.56-4.68GHz, the circular polarization bandwidth is as high as 27.1%, and the C-band downlink (3.7-4.2 GHz) frequency band is covered.
Fig. 4-6 show normalized radiation patterns of the low-profile wideband circularly polarized antenna based on a super surface of the present invention at 3.75GHz, 4.2GHz and 4.65 GHz. As can be seen from the figure, the antenna achieves left-hand circularly polarized radiation throughout the operating frequency band. Fig. 7 shows the gain of a low profile wideband circularly polarized antenna based on a super surface according to the present invention. As can be seen, the peak gain of the antenna reaches 6.9dBi.
What is not described in detail in the present specification belongs to the prior art known to those skilled in the art. While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the accompanying claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (8)
1. A low-profile broadband circularly polarized antenna based on a super surface comprises a first substrate (1) and a second substrate (2); the super surface (3) is arranged on the upper surface of the first substrate (1), the super surface (3) is a square patch which is 4 multiplied by 4, and a Z-shaped gap (4) is etched at the center of the patch; the grounding plate (5) is arranged on the upper surface of the second substrate (2), and an inclined cross-shaped gap (6) with different lengths is etched at the center of the grounding plate (5); the microstrip feeder (7) is arranged on the lower surface of the second substrate (2), and the microstrip feeder (7) is of a stepped structure.
2. The low profile broadband circularly polarized antenna of claim 1, wherein: the super surface (3) is a square patch with 4 multiplied by 4 arrangement, the center of the patch is etched with a Z-shaped gap (4), and the Z-shaped gap (4) comprises a vertical gap (41) and two horizontal gaps (42).
3. The low profile broadband circularly polarized antenna of claim 1, wherein: the center of the grounding plate (5) is etched with an inclined unequal-length cross-shaped gap (6), a long gap (61) of the cross-shaped gap (6) is in the direction of-45 degrees, and a short gap (62) is in the direction of 45 degrees.
4. The low profile broadband circularly polarized antenna of claim 1, wherein: the first substrate (1) and the second substrate (2) are rectangular dielectric substrates.
5. The low profile broadband circularly polarized antenna of claim 1, wherein: the first substrate (1) and the second substrate (2) are made of FR4 epoxy resin materials with dielectric constants of 4.4, and the thicknesses of the FR4 epoxy resin materials are 3.2mm and 0.8mm respectively.
6. The low profile broadband circularly polarized antenna of claim 1, wherein: the first substrate (1) and the second substrate (2) are each 55mm by 55mm in size.
7. The low profile broadband circularly polarized antenna of claim 1, wherein: the side length of the square patch of the super surface (3) is 11mm, and the spacing between the patches is 0.8mm; the size of the vertical gap (41) in the Z-shaped gap (4) is 2.6mm multiplied by 0.6mm, and the size of the two horizontal gaps (42) is 1.3mm multiplied by 0.6mm.
8. The low profile broadband circularly polarized antenna of claim 1, wherein: the size of the grounding plate (5) is 55mm multiplied by 55mm; the long slit (61) in the cross slit (6) has a size of 24.4mm multiplied by 1.4mm, and the short slit (62) has a size of 14.4mm multiplied by 1.4mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111121714.4A CN113839216B (en) | 2021-09-24 | 2021-09-24 | Low-profile broadband circularly polarized antenna based on super surface |
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| CN202111121714.4A CN113839216B (en) | 2021-09-24 | 2021-09-24 | Low-profile broadband circularly polarized antenna based on super surface |
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| CN113839216A CN113839216A (en) | 2021-12-24 |
| CN113839216B true CN113839216B (en) | 2023-11-14 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201812108D0 (en) * | 2018-07-25 | 2018-09-05 | Univ Surrey | Wireless data transmission using polarised electromagnetic radiation |
| CN114583455B (en) * | 2022-02-11 | 2024-03-01 | 桂林电子科技大学 | Ultra-wideband circularly polarized super-surface patch antenna based on spiral feed structure |
| CN114824774B (en) * | 2022-05-05 | 2023-03-24 | 电子科技大学 | Broadband high-isolation dual-polarization super-surface antenna |
| CN115548689B (en) * | 2022-09-30 | 2024-02-06 | 曲阜师范大学 | Multimode resonant low-profile broadband ultra-surface antenna |
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