CN215579015U - Button antenna based on directional radiation of artificial magnetic materials - Google Patents
Button antenna based on directional radiation of artificial magnetic materials Download PDFInfo
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- CN215579015U CN215579015U CN202121663484.XU CN202121663484U CN215579015U CN 215579015 U CN215579015 U CN 215579015U CN 202121663484 U CN202121663484 U CN 202121663484U CN 215579015 U CN215579015 U CN 215579015U
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Abstract
The utility model discloses a button antenna based on directional radiation of artificial magnetic materials, wherein a top round medium and a bottom round medium are oppositely arranged, the bottom round medium, a metal column, the medium column and the top round medium are sequentially connected and arranged in an I-shaped button shape, and an AMC structure is arranged between the top round medium and the bottom round medium.
Description
Technical Field
The utility model relates to the technical field of button antennas, in particular to a button antenna based on directional radiation of artificial magnetic materials.
Background
With the development of wireless communication technology, research on body area network communication systems centered on the human body is also deepened gradually, and communication modules which are placed at various parts of the human body and are responsible for different functions form a complete communication network. The antenna is an important component of the radio frequency front end, and due to the action of human tissues, the performance of the antenna is influenced, and meanwhile, the design is greatly challenged due to the limited space occupied by the antenna, so that the research on the antenna which transmits along the body surface direction and has directionality is necessary.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a button antenna based on directional radiation of artificial magnetic materials, aiming at realizing the problem of directional radiation on the premise of not increasing the transverse size of the button antenna.
In order to achieve the above purpose, the button antenna based on directional radiation of artificial magnetic materials adopted by the utility model comprises a full fabric medium substrate, an AMC structure, a metal pillar, a medium pillar, a top circular medium and a bottom circular medium, wherein the bottom circular medium is fixedly connected with the full fabric medium substrate and is located above the full fabric medium substrate, the top circular medium and the bottom circular medium are oppositely arranged, the bottom circular medium, the metal pillar, the medium pillar and the top circular medium are sequentially connected and are arranged in an i-shaped button shape, and the AMC structure is arranged between the top circular medium and the bottom circular medium.
The dielectric parameter of the all-fabric dielectric substrate is 1.6, and the loss tangent is 0.02.
One end of the metal column is embedded in the bottom round medium, and the other end of the metal column is inserted into the medium column.
Wherein the AMC structure is arranged opposite to the metal pillar, and the distance between the AMC structure and the metal pillar is 3.8 mm.
The button antenna based on the directional radiation of the artificial magnetic materials further comprises a conductive fabric microstrip line, wherein the conductive fabric microstrip line is arranged on the upper surface of the full fabric dielectric substrate and is positioned on one side close to the AMC structure.
The button antenna based on the directional radiation of the artificial magnetic materials further comprises a defected ground structure, wherein the defected ground structure is fixedly connected with the full-fabric dielectric substrate and is located below the full-fabric dielectric substrate.
Wherein, the defect part of the defect ground structure is an I-shaped gap.
According to the button antenna based on directional radiation of the artificial magnetic material, the top round medium and the bottom round medium are arranged oppositely, the bottom round medium, the metal column, the medium column and the top round medium are sequentially connected and arranged in an I-shaped button shape, the AMC structure is arranged between the top round medium and the bottom round medium, compared with the prior art, the button antenna achieves a button-shaped structure with the overall height of 10mm, the button antenna is changed from original omnidirectional radiation into directional radiation by adding the AMC structure under the condition that the transverse size of the button antenna is not additionally increased, and the gain of the wearable button antenna is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a three-dimensional structure of a button antenna based on directional radiation of artificial magnetic materials.
FIG. 2 is a side view of a button antenna based on directional radiation of artificial magnetic material according to the utility model.
FIG. 3 is a top view of a button antenna based on directional radiation of artificial magnetic materials according to the utility model.
FIG. 4 is a schematic diagram of the AMC structure of the present invention.
Fig. 5 is a graph showing the variation of reflection coefficient with frequency for the AMC structure unit of the present invention.
Fig. 6 is a schematic representation of the reflected phase of an AMC structure element of the present invention as a function of frequency.
FIG. 7 is a schematic diagram of the variation of the reflection coefficient of the button antenna based on the directional radiation of the artificial magnetic material with frequency according to the utility model.
FIG. 8 is a comparison graph of the directional patterns of the button antenna based on the directional radiation of artificial magnetic materials and the button antenna without loading the AMC structure.
FIG. 9 is a polar far-field radiation diagram of the E surface of the button antenna based on directional radiation of artificial magnetic materials.
FIG. 10 is a button antenna H-plane polar far-field radiation pattern based on artificial magnetic material directional radiation.
1-full fabric dielectric substrate, 2-AMC structure, 3-metal column, 4-dielectric column, 5-top circular dielectric, 6-bottom circular dielectric, 7-conductive fabric microstrip line, and 8-defected ground structure.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 4, the present invention provides a button antenna based on directional radiation of artificial magnetic materials, including a full fabric dielectric substrate 1, an AMC structure 2, a metal pillar 3, a dielectric pillar 4, a top circular dielectric 5, and a bottom circular dielectric 6, where the bottom circular dielectric 6 is fixedly connected to the full fabric dielectric substrate 1 and located above the full fabric dielectric substrate 1, the top circular dielectric 5 and the bottom circular dielectric 6 are oppositely disposed, the bottom circular dielectric 6, the metal pillar 3, the dielectric pillar 4, and the top circular dielectric 5 are sequentially connected to form an i-shaped button, and the AMC structure 2 is disposed between the top circular dielectric 5 and the bottom circular dielectric 6.
The dielectric parameter of the all-fabric dielectric substrate 1 is 1.6, and the loss tangent is 0.02.
One end of the metal column 3 is embedded in the bottom round medium 6, and the other end of the metal column 3 is inserted into the medium column 4.
The AMC structure 2 is disposed opposite to the metal posts 3, and the distance from the metal posts 3 is 3.8 mm.
The button antenna based on the directional radiation of the artificial magnetic materials further comprises a conductive fabric microstrip line 7, wherein the conductive fabric microstrip line 7 is arranged on the upper surface of the full fabric dielectric substrate 1 and is positioned on one side close to the AMC structure 2.
The button antenna based on directional radiation of artificial magnetic materials further comprises a defect ground structure 8, wherein the defect ground structure 8 is fixedly connected with the full-fabric dielectric substrate 1 and is located below the full-fabric dielectric substrate 1.
The defect part of the defect ground structure 8 is an I-shaped gap.
In the present embodiment, the all-fabric dielectric substrate 1 is made of an all-fabric dielectric, and has good dielectric properties, a dielectric parameter of 1.6, and a loss tangent of 0.02.
Optionally, the thickness of the all-fabric dielectric substrate 1 is 1.5mm, the length is 30mm, and the width is 25mm, and the miniaturization of the antenna is highlighted by using the size. The size of the all-fabric dielectric substrate 1 can adjust the matching and the gain of the antenna.
The metal column 3 is inserted into the medium column 4 upwards, and the radius of the metal column is slightly smaller than that of the medium column 4; the bottom round medium 6 is embedded downwards, the bottom round medium 6 has a certain fixing effect on the metal column 3, and the round medium with the dielectric constant has a certain matching effect.
The top round medium 5 is positioned on the medium column 4 and integrally forms an I-shaped button shape, and the top round medium 5 simultaneously plays a role in fixing the medium column 4.
The AMC structure 2 is formed by arranging 2 multiplied by 3 unit structures to form a complete reflecting surface, so that a close-range compact total reflection structure is realized, which is the key for forming button antenna directional radiation.
The conductive fabric microstrip line 7 is located close to one side of the AMC structure 2, approximately a quarter wavelength, and thus acts as a matching, feeding and balun.
The defected ground structure 8 may reduce the backward radiation of the antenna.
Please refer to fig. 5, which is a diagram illustrating the reflection coefficient of the unit of the AMC structure 2 varying with frequency. For the AMC structure 2, it is required to satisfy that the S11 parameter is greater than or equal to-0.75 dB, and the real part of S11 is close to 1, and the imaginary part is close to 0, to realize the total reflection function in a short distance, and the designed AMC structure 2 satisfies its condition in the bandwidth range of 5.8 GHz.
Please refer to fig. 6, which is a schematic diagram of the variation of the reflection phase of the button antenna based on the directional radiation of the artificial magnetic material with the frequency, and the reflection phase is 0 near the resonant frequency.
Please refer to fig. 7, which is a schematic diagram of the change of the reflection coefficient of the button antenna with the frequency based on the directional radiation of the artificial magnetic material, and the antenna matching is good after the AMC structure 2 is loaded.
Referring to fig. 8, which is a comparison graph of directional patterns of a button antenna based on directional radiation of artificial magnetic materials and a common button antenna without loading the AMC structure 2, after loading the AMC structure 2, the button antenna changes from original omnidirectional radiation to directional radiation in the opposite direction to the AMC structure 2 loaded, and the gain is increased by about 2 dB.
Please refer to fig. 9, which is a polar far field radiation diagram of the E-plane of the button antenna based on directional radiation of artificial magnetic material. It can be seen that, after the defected ground structure 8 is loaded, the backward radiation generated by the button antenna provided by the patent can be obviously reduced.
Referring to fig. 10, which is a polar far-field radiation pattern of the H-plane of the button antenna based on directional radiation of artificial magnetic materials, after the AMC structure 2 is loaded, the button antenna provided in this patent changes from original omnidirectional radiation into directional radiation.
Compared with the prior art, the antenna has the advantages that the button type structure with the overall height of 10mm is realized, the button antenna is changed from original omnidirectional radiation into directional radiation by adding the AMC structure 2 under the condition that the transverse size of the button antenna is not additionally increased, and the gain of the wearable button antenna is improved.
While the utility model has been described with reference to a preferred embodiment, 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 spirit and scope of the utility model.
Claims (7)
1. A button antenna based on artificial magnetic material directional radiation is characterized in that,
the AMC structure comprises a full fabric medium substrate, an AMC structure, a metal column, a medium column, a top circular medium and a bottom circular medium, wherein the bottom circular medium is fixedly connected with the full fabric medium substrate and is positioned above the full fabric medium substrate, the top circular medium and the bottom circular medium are oppositely arranged, the bottom circular medium, the metal column, the medium column and the top circular medium are sequentially connected and are arranged in an I-shaped button shape, and the AMC structure is arranged between the top circular medium and the bottom circular medium.
2. The button antenna based on the directional radiation of the artificial magnetic material and the claim 1, wherein the dielectric parameter of the full fabric dielectric substrate is 1.6, and the loss tangent is 0.02.
3. The button antenna based on directional radiation of artificial magnetic materials according to claim 1, wherein one end of the metal pillar is embedded in the bottom circular medium, and the other end of the metal pillar is inserted into the medium pillar.
4. The button antenna based on directional radiation of artificial magnetic materials according to claim 1, wherein the AMC structure is disposed opposite to the metal pillar and at a distance of 3.8mm from the metal pillar.
5. The button antenna based on the directional radiation of the artificial magnetic materials, according to claim 1, further comprising a conductive fabric microstrip line disposed on the upper surface of the all-fabric dielectric substrate and located on one side close to the AMC structure.
6. The button antenna based on the directional radiation of the artificial magnetic materials, according to claim 1, further comprising a defected ground structure, wherein the defected ground structure is fixedly connected with the all-fabric dielectric substrate and is located below the all-fabric dielectric substrate.
7. The button antenna based on directional radiation of artificial magnetic materials according to claim 6, wherein the defect part of the defected ground structure is an I-shaped gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121663484.XU CN215579015U (en) | 2021-07-21 | 2021-07-21 | Button antenna based on directional radiation of artificial magnetic materials |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121663484.XU CN215579015U (en) | 2021-07-21 | 2021-07-21 | Button antenna based on directional radiation of artificial magnetic materials |
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| Publication Number | Publication Date |
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| CN215579015U true CN215579015U (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121663484.XU Active CN215579015U (en) | 2021-07-21 | 2021-07-21 | Button antenna based on directional radiation of artificial magnetic materials |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113594662A (en) * | 2021-07-21 | 2021-11-02 | 桂林电子科技大学 | Button antenna based on directional radiation of artificial magnetic materials |
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2021
- 2021-07-21 CN CN202121663484.XU patent/CN215579015U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113594662A (en) * | 2021-07-21 | 2021-11-02 | 桂林电子科技大学 | Button antenna based on directional radiation of artificial magnetic materials |
| CN113594662B (en) * | 2021-07-21 | 2024-08-27 | 桂林电子科技大学 | Button antenna based on artificial magnetic material directional radiation |
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