CN116826370A - Wide-beam self-decoupling microstrip antenna - Google Patents
Wide-beam self-decoupling microstrip antenna Download PDFInfo
- Publication number
- CN116826370A CN116826370A CN202310946023.0A CN202310946023A CN116826370A CN 116826370 A CN116826370 A CN 116826370A CN 202310946023 A CN202310946023 A CN 202310946023A CN 116826370 A CN116826370 A CN 116826370A
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- patch
- rectangular
- decoupling
- wide
- microstrip antenna
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- 239000000758 substrate Substances 0.000 claims abstract description 36
- 239000002184 metal Substances 0.000 claims abstract description 27
- 239000004020 conductor Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 12
- 238000002955 isolation Methods 0.000 abstract description 8
- 238000004891 communication Methods 0.000 abstract description 4
- 239000002356 single layer Substances 0.000 abstract description 3
- 239000013307 optical fiber Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000011295 pitch Substances 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
Abstract
The invention relates to the technical field of antennas, in particular to a wide-beam self-decoupling microstrip antenna. The coaxial line feed circuit comprises a metal floor, a dielectric substrate, two patch units and two coaxial line feeds; the patch unit comprises a rectangular patch and four auxiliary patches, and a metal short-circuit column is arranged in a substrate below the auxiliary patches. The invention realizes high isolation work of the array under extremely small center distance on a single-layer substrate by endowing the miniaturized antenna with self-decoupling characteristic, is smaller than one quarter of free space wavelength, has small size of the antenna array and wide beam radiation pattern, and is suitable for indoor wireless communication with limited space, such as optical fiber indoor application scene.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a wide-beam self-decoupling microstrip antenna.
Background
In space-constrained indoor wireless communications scenarios, such as fiber optic, a highly isolated wide beam antenna array is required to be tightly packed in a confined space in order to ensure signal coverage and network performance. The problem of suppressing coupling between antenna units is an important problem in design, and the mutual coupling effect may distort the antenna pattern, deteriorate the input impedance matching, etc. Conventional methods for increasing the isolation level by decoupling structures increase the complexity of the antenna array structure and require additional space. With the development trend of miniaturization and compactness of antenna arrays, self-decoupling antennas naturally have a good isolation level without adding additional structures, and have been attracting attention.
Disclosure of Invention
The invention aims to provide a wide-beam self-decoupling microstrip antenna which is used for solving the problem of designing a high-isolation antenna array in an indoor wireless communication scene with limited space.
The invention aims at realizing the technical scheme that the coaxial cable feeder comprises a metal floor, a dielectric substrate, two patch units and two coaxial cable feeders;
the metal floor is attached to the lower end face of the medium substrate, and the two patch units are symmetrically attached to the upper end face of the medium substrate by the central line of the medium substrate;
the patch units comprise equal main rectangular patches, rectangular protrusions are symmetrically arranged at the central positions of two opposite sides of each main rectangular patch, a first gap is arranged between two adjacent rectangular protrusions of each two patch units, and the patch units are symmetrically designed by the center line of the medium substrate;
the two coaxial line feeds are arranged below the dielectric substrate, and the outer conductors of the coaxial line feeds are connected with the metal floor; the inner conductor of the coaxial line feed is respectively connected with the lower end surfaces of two rectangular bulges adjacent to the two patch units;
the patch unit further comprises four short circuit branches respectively positioned at four corners of the main rectangular patch, and each short circuit branch comprises an auxiliary patch and a metal short circuit column; two opposite side edges of each rectangular bulge are respectively provided with an auxiliary patch, and the auxiliary patches, the main rectangular patches and the rectangular bulge keep a second gap; one end of the auxiliary patch, which is far away from the rectangular bulge, extends out of the side edge of the main rectangular patch, and a metal short-circuit column is arranged in the substrate below the auxiliary patch.
Further, the two coaxial line feed resistances are both 50Ω.
Further, the length of the dielectric substrate is 46mm, the width of the dielectric substrate is 30mm, the thickness of the dielectric substrate is 3mm, the material of the dielectric substrate is F4B, the relative dielectric constant of the dielectric substrate is 2.2, the relative magnetic permeability of the dielectric substrate is 1.0, and the loss tangent of the dielectric substrate is 0.0009;
the symmetry line of the two patch units is positioned at the center of the long side of the medium substrate.
Further, the first gap has a pitch of 0.15mm.
Further, the length of two sides of the rectangular bulge of the main rectangular patch is 10mm, and the length of the other two sides is 7.4mm;
the length of the rectangular bulge is 2.15mm; the width of the rectangular bulge is 2.4mm;
the distance between the connection point of the rectangular bulge and the feeding of the coaxial line and the edge of the rectangular bulge is 1.8mm.
Further, the length of the auxiliary patch is 4.3mm, and the width of the auxiliary patch is 1mm;
the auxiliary patch is connected with a circular metal disc at one end of the metal short-circuit column, the metal short-circuit column is cylindrical, the radius of the circular metal disc is 0.7mm, and the radius of the metal short-circuit column is 0.5mm.
Further, the second gap has a pitch of 0.15mm.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the short circuit branches are added, so that the size of the patch units is greatly reduced, and meanwhile, the patch units are close enough to the main rectangular patch to be excited well, and the radiation pattern is overlapped with the radiation of the main rectangular patch through the short circuit branches to form a wide-beam radiation pattern.
2. The short circuit branches and gaps near the central line can form a coupled resonator band-pass filter, the transmission response of the coupled resonator band-pass filter is opposite to the phase of the original coupling path, the transmission response is identical to the amplitude of the original coupling path, the transmission response and the original coupling path can be mutually offset, the isolation level of two patch units is greatly improved, and the coupled resonator band-pass filter has self-decoupling characteristics.
3. On the single-layer substrate, the high isolation work of the patch units under the extremely small spacing is realized, and the center spacing is smaller than the wavelength under the quarter free space, so that the antenna size is greatly reduced, the wide beam radiation pattern is provided, and the antenna is suitable for indoor wireless communication scenes with limited space.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
The drawings of the present invention are described below.
Fig. 1 is an overall schematic diagram of an antenna according to the present invention.
Fig. 2 is a top view of the antenna of the present invention.
Fig. 3 is a front view of the antenna of the present invention.
Fig. 4 is a graph of S-parameters of the antenna of the present invention.
Fig. 5 is a graph of the efficiency versus ECC of the antenna of the present invention.
Fig. 6 is a radiation pattern of xz, yz plane of the antenna of the present invention at 5.887GHz frequency, when only port 1 is excited.
Fig. 7 is a radiation pattern of xz, yz plane of the antenna of the present invention at 5.887GHz frequency, when only port 2 is excited.
Detailed Description
The invention is further described below with reference to the drawings and examples.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
The wide-beam self-decoupling microstrip antenna comprises a metal floor 1, a dielectric substrate 2, two patch units and two coaxial line feeds 3 as shown in figures 1, 2 and 3;
the metal floor 1 is attached to the lower end face of the medium substrate 2, and the two patch units are symmetrically attached to the upper end face of the medium substrate 2 by the central line of the medium substrate 2;
the patch units comprise rectangular patches 4, rectangular protrusions are symmetrically arranged at the central positions of two opposite sides of the rectangular patches 4, a first gap is arranged between two adjacent rectangular protrusions of the two patch units, and the rectangular patches are symmetrically designed by the center line of the medium substrate 2;
the two coaxial line feeds 3 are arranged below the dielectric substrate 2, and the outer conductors of the coaxial line feeds 3 are connected with the metal floor 1; the inner conductor of the coaxial line feed 3 is respectively connected with the lower end surfaces of two rectangular bulges adjacent to the two patch units;
the patch unit further comprises four short circuit branches respectively positioned at four corners of the main rectangular patch, and each short circuit branch comprises an auxiliary patch and a metal short circuit column 5; two opposite side edges of each rectangular bulge are provided with an auxiliary patch, and the auxiliary patch, the main rectangular patch 4 and the rectangular bulge keep a second gap; one end of the auxiliary patch, which is far away from the rectangular bulge, extends out of the side edge of the main rectangular patch 4, and a metal short-circuit column 5 is arranged in the substrate below the auxiliary patch.
The resistances of the two coaxial line feeds 3 are 50 omega.
As shown in fig. 2, specific parameters of the wide-beam self-decoupling microstrip antenna are shown in the following table:
according to the above parameters, the simulation analysis is performed on the characteristic parameters such as the S parameter, the directional radiation gain and the like of the designed wide-beam miniaturized self-decoupling microstrip antenna array by using the HFSS2020, and the analysis results are as follows:
fig. 4 is a graph of the S-parameter versus frequency for the present invention, with a 10dB impedance bandwidth in the range 5.794 to 5.997GHz and a relative bandwidth of 3.44%. The isolation level in the bandwidth is good, |S 21 The minimum value of the I value is-46.55 dB and is located at 5.887GHz.
FIG. 5 is a graph of efficiency versus ECC over frequency for the present invention, with an average efficiency of 97.02% and an ECC below 0.004 across the operating bandwidth.
Fig. 6 is a radiation pattern of xz, yz plane when only port 1 is excited at 5.887GHz frequency of the present invention. The self-decoupling antenna array now radiates a half-power beamwidth HPBW of 142 ° in the xz plane and radiates a wide beampattern, HPBW of 89 ° in the yz plane. The maximum gain of the antenna array is 5.48dBi.
Fig. 7 is a radiation pattern of xz, yz plane when only port 2 is excited at 5.887GHz frequency of the present invention. The self-decoupling antenna array now radiates a half-power beamwidth HPBW of 142 ° in the xz plane and radiates a wide beampattern, HPBW of 89 ° in the yz plane. The maximum gain of the antenna array is 5.48dBi.
In summary, the antenna has a low profile height and an impedance matching range of 5.794 to 5.997GHz, and achieves high isolation operation and wide beam radiation at ultra-small cell pitches under a single-layer structure, and has good impedance matching characteristics and a better and stable radiation pattern.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (7)
1. The wide-beam self-decoupling microstrip antenna is characterized by comprising a metal floor, a dielectric substrate, two patch units and two coaxial line feeds;
the metal floor is attached to the lower end face of the medium substrate, and the two patch units are symmetrically attached to the upper end face of the medium substrate by the central line of the medium substrate;
the patch units comprise equal main rectangular patches, rectangular protrusions are symmetrically arranged at the central positions of two opposite sides of each main rectangular patch, a first gap is arranged between two adjacent rectangular protrusions of each two patch units, and the patch units are symmetrically designed by the center line of the medium substrate;
the two coaxial line feeds are arranged below the dielectric substrate, and the outer conductors of the coaxial line feeds are connected with the metal floor; the inner conductor of the coaxial line feed is respectively connected with the lower end surfaces of two rectangular bulges adjacent to the two patch units;
the patch unit further comprises four short circuit branches respectively positioned at four corners of the main rectangular patch, and each short circuit branch comprises an auxiliary patch and a metal short circuit column; two opposite side edges of each rectangular bulge are respectively provided with an auxiliary patch, and the auxiliary patches, the main rectangular patches and the rectangular bulge keep a second gap; one end of the auxiliary patch, which is far away from the rectangular bulge, extends out of the side edge of the main rectangular patch, and a metal short-circuit column is arranged in the substrate below the auxiliary patch.
2. The wide-beam self-decoupling microstrip antenna of claim 1, wherein the two coaxial feed resistances are each 50Ω.
3. The wide-beam self-decoupling microstrip antenna of claim 1, wherein the dielectric substrate has a length of 46mm, a width of 30mm, and a thickness of 3mm, the dielectric substrate is made of F4B, the relative permittivity is 2.2, the relative permeability is 1.0, and the loss tangent is 0.0009; the symmetry line of the two patch units is positioned at the center of the long side of the medium substrate.
4. The wide-beam self-decoupling microstrip antenna of claim 1, wherein the first gap has a pitch of 0.15mm.
5. The wide-beam self-decoupling microstrip antenna of claim 1, wherein the length of two sides of the main rectangular patch provided with rectangular projections is 10mm, and the length of the other two sides is 7.4mm;
the length of the rectangular bulge is 2.15mm; the width of the rectangular bulge is 2.4mm;
the distance between the connection point of the rectangular bulge and the feeding of the coaxial line and the edge of the rectangular bulge is 1.8mm.
6. The wide-beam self-decoupling microstrip antenna of claim 1, wherein said auxiliary patch has a length of 4.3mm and a width of 1mm;
the auxiliary patch is connected with a circular metal disc at one end of the metal short-circuit column, the metal short-circuit column is cylindrical, the radius of the circular metal disc is 0.7mm, and the radius of the metal short-circuit column is 0.5mm.
7. The wide-beam self-decoupling microstrip antenna of claim 1, wherein the pitch of said second gap is 0.15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310946023.0A CN116826370A (en) | 2023-07-31 | 2023-07-31 | Wide-beam self-decoupling microstrip antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310946023.0A CN116826370A (en) | 2023-07-31 | 2023-07-31 | Wide-beam self-decoupling microstrip antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116826370A true CN116826370A (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310946023.0A Pending CN116826370A (en) | 2023-07-31 | 2023-07-31 | Wide-beam self-decoupling microstrip antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116826370A (en) |
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2023
- 2023-07-31 CN CN202310946023.0A patent/CN116826370A/en active Pending
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