CN216903327U - Button antenna for realizing directional radiation based on incomplete AMC structure - Google Patents

Abstract

The utility model discloses a button antenna for realizing directional radiation based on an incomplete AMC structure, which comprises a top circular medium, a button antenna structure, a bottom circular medium, a full fabric medium substrate, a conductive fabric bottom plate, a conductive fabric microstrip line and an incomplete AMC structure, wherein the button antenna structure comprises a top circular medium, a button antenna structure, a bottom circular medium, a full fabric medium substrate, a conductive fabric bottom plate, a conductive fabric microstrip line and an incomplete AMC structure; the metal column and the dielectric column form a button antenna structure, the incomplete AMC structure is located between the top circular medium and the bottom circular medium, and the conductive fabric microstrip line is located on one side close to the incomplete AMC structure. According to the antenna, under the condition that the transverse size of the button antenna is not additionally increased, the button antenna is changed from original omnidirectional radiation into directional radiation by adding the incomplete AMC structure, and the gain of the wearable button antenna is improved while backward radiation is reduced.

Description

Button antenna for realizing directional radiation based on incomplete AMC structure

Technical Field

The utility model relates to the technical field of radio frequency antennas, in particular to a button antenna for realizing directional radiation based on an incomplete AMC structure.

Background

With the development of wearable technology, research on the body area network pushes the research on the directional radiation antenna along the body surface. Therefore, on the basis, the incomplete AMC structure technology is adopted to research the button antenna suitable for the application, and the directional radiation of the electromagnetic waves along the body surface direction on the characteristics of the low-profile and small-area antenna is realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a button antenna for realizing directional radiation based on an incomplete AMC structure, aiming at solving the problem of realizing the directional radiation on the premise of not increasing the transverse size of the button antenna.

In order to achieve the above object, the present invention provides a button antenna for realizing directional radiation based on an incomplete AMC structure, including a top circular medium, a button antenna structure, a bottom circular medium, a full fabric medium substrate, a conductive fabric backplane, a conductive fabric microstrip line, and an incomplete AMC structure, where the top circular medium, the button antenna structure, the bottom circular medium, and the full fabric medium substrate are sequentially arranged from top to bottom, the conductive fabric microstrip line is embedded in the top of the full fabric medium substrate and is located on a side surface of the bottom circular medium, and the incomplete AMC structure is arranged between the top circular medium and the partial circular medium;

the button antenna comprises a dielectric column and a metal column, wherein the top circular medium, the dielectric column, the metal column and the bottom circular medium are sequentially connected.

The bottom end of the metal column is embedded into the bottom round medium, and the top end of the metal column is inserted into the medium column and abuts against the top round medium.

The dielectric constant of the all-fabric dielectric substrate is 1.6, and the loss tangent is 0.02.

Wherein the incomplete AMC structure is 3.5mm from the edge of the metal pillar.

The utility model has the beneficial effects that: under the condition that the transverse size of the button antenna is not additionally increased, the button antenna is changed from original omnidirectional radiation into directional radiation by adding the incomplete AMC structure, and the gain of the wearable button antenna is improved while the backward radiation is reduced.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and 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 these drawings without creative efforts.

Fig. 1 is a schematic diagram of a three-dimensional structure of a directional button antenna based on an incomplete AMC structure according to the present invention.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a top view of fig. 1.

Fig. 4 is a schematic diagram of the AMC unit structure provided by the present invention.

FIG. 5 is a schematic diagram of an incomplete AMC structure provided by the present invention.

Fig. 6 is a schematic diagram of the reflection coefficient of an AMC unit provided by the present invention and its real and imaginary parts as a function of frequency.

Fig. 7 is a schematic diagram of the reflection phase of an AMC unit provided by the present invention as a function of frequency.

Fig. 8 is a schematic diagram of the reflection coefficient of a directional button antenna based on an incomplete AMC structure according to the present invention, which varies with frequency.

Fig. 9 is a comparison graph of the directional pattern of the button antenna based on the incomplete AMC structure and the button antenna without the incomplete AMC structure loaded according to the present invention.

Fig. 10 is a polar far-field radiation pattern of the E-plane of a directional button antenna based on an incomplete AMC structure according to the present invention.

Fig. 11 is a polar far-field radiation diagram of the H-plane of a directional button antenna based on an incomplete AMC structure according to the present invention.

1-top circular medium, 2-button antenna structure, 3-bottom circular medium, 4-full fabric medium substrate, 5-conductive fabric bottom plate, 6-conductive fabric microstrip line, 7-incomplete AMC structure, 21-medium column, and 22-metal column.

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 button antenna for implementing directional radiation based on the incomplete AMC structure 7 includes a top circular medium 1, a button antenna structure 2, a bottom circular medium 3, a full fabric medium substrate 4, a conductive fabric backplane 5, a conductive fabric microstrip line 6, and an incomplete AMC structure 7, the top circular medium 1, the button antenna structure 2, the bottom circular medium 3, and the full fabric medium substrate 4 are sequentially disposed from top to bottom, the conductive fabric microstrip line 6 is embedded in the top of the full fabric medium substrate 4 and is located on a side surface of the bottom circular medium 3, and the incomplete AMC structure 7 is disposed between the top circular medium 12 and the bottom circular medium 3;

the button antenna comprises a dielectric column 21 and a metal column 22, wherein the top circular medium 1, the dielectric column 21, the metal column 22 and the bottom circular medium 3 are sequentially connected.

Further, the bottom end of the metal column 22 is embedded into the bottom round medium 3, and the top end of the metal column 22 is inserted into the medium column 21 and abuts against the top round medium 1.

Further, the dielectric constant of the all-fabric dielectric substrate 4 is 1.6, and the loss tangent is 0.02.

Further, the incomplete AMC structure 7 is 3.5mm from the edge of the metal pillar 22.

Specifically, the all-fabric dielectric substrate 4 adopts an all-fabric dielectric, and has good dielectric property, a dielectric parameter of 1.6 and a loss tangent of 0.02. The thickness of the all-fabric dielectric substrate 4 is 1.5mm, the length is 28mm, and the width is 20mm, which highlights the miniaturization of the antenna.

The metal column 22 is connected with the medium column 21 upwards, and the radius of the metal column is slightly smaller than that of the medium column 21; the bottom round medium 3 is embedded downwards, the bottom round medium 3 has a certain fixing effect on the metal column 22, and the round medium with the dielectric constant of 6.15 plays a matching role.

The top round medium 1 is positioned on the medium column 21 to form a button shape, and has a certain fixing function on the medium column 21.

The incomplete AMC structure 7 is located between the top circular dielectric 1 and the bottom circular dielectric 3 and on the side of the button antenna structure 2 composed of the metal post 22 and the dielectric post 21, at a distance of 3.5mm from the metal post 22. The thickness of the incomplete AMC structure 7 is 1.3mm, the dielectric constant is 6.15, the loss is 0.0045, and the incomplete AMC structure is formed by arranging incomplete periodic unit structures to form a complete reflection surface, so that a close-range in-phase reflection structure is realized, which is the key for forming button antenna directional radiation.

The microstrip line 4 is located close to the incomplete AMC structure 7 on one side, approximately a quarter wavelength, and thus acts as a matching, feeding and balun.

The size of the dielectric substrate 1 can adjust the matching and the gain of the antenna.

Please refer to fig. 6, which is a diagram illustrating the variation of the transmitting coefficient and the real and imaginary parts of the AMC structure unit with frequency. For the AMC structure, 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, so that the total reflection function at a close distance can be realized. It can be seen that the AMC structure is designed to meet its condition in the 5.8GHz ISM bandwidth range.

Please refer to fig. 7, which is a diagram illustrating the variation of the reflection phase of the AMC structure with frequency. It can be seen that the reflection phase is 0 around the resonance frequency.

Please refer to fig. 8, which is a schematic diagram of the reflection coefficient of the directional button antenna based on the incomplete AMC structure varying with frequency. It can be seen that the antenna matches well after loading the structure.

Please refer to fig. 9, which is a comparison graph of directional button antenna based on incomplete AMC structure 7 and the normal button antenna pattern without loaded incomplete AMC periodic structure. It can be seen that after the incomplete AMC structure 7 is loaded, the button antenna changes from the original omnidirectional radiation to the directional radiation, and the gain is increased by about 2.4 dBi.

Please refer to fig. 10, which is a polar far field radiation diagram of the E-plane of the directional button antenna based on the incomplete AMC structure. It can be seen that the back radiation of the button antenna proposed in this patent is significantly reduced after loading the incomplete AMC structure 7.

Please refer to fig. 11, which is a polar far field radiation diagram of the H-plane of the directional button antenna based on the incomplete AMC structure. It can be seen that the button antenna proposed in this patent changes from the original omnidirectional radiation to the directional radiation after loading the incomplete AMC structure 7.

Compared with the prior art, the button type structure with the overall height of 11mm is realized by the antenna, the button antenna is changed from original omnidirectional radiation into directional radiation by adding the incomplete AMC structure 7 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 backward radiation is reduced.

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 (4)

1. A button antenna for realizing directional radiation based on an incomplete AMC structure is characterized in that,

the antenna comprises a top circular medium, a button antenna structure, a bottom circular medium, a full fabric medium substrate, a conductive fabric baseplate, a conductive fabric microstrip line and an incomplete AMC structure, wherein the top circular medium, the button antenna structure, the bottom circular medium and the full fabric medium substrate are sequentially arranged from top to bottom, the conductive fabric microstrip line is embedded into the top of the full fabric medium substrate and is positioned on the side surface of the bottom circular medium, and the incomplete AMC structure is arranged between the top circular medium and the bottom circular medium;

the button antenna comprises a dielectric column and a metal column, wherein the top circular medium, the dielectric column, the metal column and the bottom circular medium are sequentially connected.

2. Button antenna implementing directional radiation based on an incomplete AMC structure according to claim 1,

the bottom end of the metal column is embedded into the bottom round medium, and the top end of the metal column is inserted into the medium column and is abutted against the top round medium.

3. Button antenna implementing directional radiation based on an incomplete AMC structure according to claim 1,

the dielectric constant of the all-fabric dielectric substrate is 1.6, and the loss tangent is 0.02.

4. Button antenna implementing directional radiation based on an incomplete AMC structure according to claim 2,

the incomplete AMC structure was 3.5mm from the metal pillar edge.

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