CN114156637B - Broadband omni-directional wearable antenna based on graphite and preparation method thereof - Google Patents
Broadband omni-directional wearable antenna based on graphite and preparation method thereof Download PDFInfo
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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
- H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
- H01Q1/368—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor using carbon or carbon composite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/20—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern
- H05K3/207—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern using a prefabricated paste pattern, ink pattern or powder pattern
Abstract
The invention discloses a broadband omnidirectional wearable antenna based on graphite and a preparation method thereof. The invention provides a graphite antenna working in an industrial scientific medical frequency band (ISM frequency band) based on high conductive property, flexibility, physical chemical stability and the like of graphite. The antenna has the characteristics of low profile, wide band, radiation omnidirectionality, capability of being attached to the surface of a human body and the like, adopts a coplanar waveguide structure, is provided with a graphite radiation top layer structure and a braided fabric substrate structure, and adopts SMA feed. The graphite radiation structure adopts a plurality of equilateral triangle combination forms, and has simple structure and easy design and manufacture; the fabric substrate structure adopts common cloth and can be directly contacted with human skin. The antenna can be used for indoor positioning application, motion data monitoring and other scenes, and is an important part of future intelligent wearable equipment.
Description
Technical Field
The invention relates to the technical field of antennas in the field of wearable communication, in particular to a broadband omnidirectional wearable antenna based on graphite and a preparation method thereof.
Background
Wearable communication technology is one of the technologies rapidly developed in recent years, and the wearable technology is closely connected with internet of things (IoT) technology, an intelligent platform and the medical health field, and can be applied to the fields of motion monitoring, health management, indoor positioning and the like. An antenna is one of key devices for transmitting and receiving signals in a communication system, and performance of the antenna is critical to the communication system. Particularly in the field of wearable technology, an antenna should have good conformal properties, compact size and wearing comfort in addition to good radiation conversion efficiency. However, conventional metal material antennas, including copper, gold, etc., are easily oxidized by air and easily corroded in a humid environment, which may cause degradation of antenna performance; meanwhile, the metal material antenna is not easy to achieve good conformality, so that the application of the traditional antenna in the field of wearable technology is limited.
Graphite has been paid attention to as a novel material by researchers, has good electric conductivity, heat conductivity, physical and chemical stability, good ductility and environmental protection compared with metal, and becomes a feasible application material for wearable communication technology. Graphite antennas will also become an important component in the field of wearable communication technology.
Disclosure of Invention
Aiming at the requirements of the technical field of wearable communication on antenna conformal, electromagnetic performance and physical and chemical stability, the invention provides a graphite-based broadband omnidirectional wearable antenna and a preparation method thereof, and designs a graphite wearable antenna with simple structure, wide frequency band, omnidirectional radiation and low profile; based on design parameters, the wearable antenna is prepared, and electromagnetic performance under relevant scenes is tested, so that index requirements are met.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a broadband omnidirectional wearable antenna based on graphite comprises a graphite radiation structure and a braided fabric substrate structure; the graphite radiation structure is adhered with the braided fabric substrate structure; the graphite radiation structure adopts a coplanar waveguide form and comprises a first rectangular signal ground, a long rectangular-to-equilateral triangle combined transition structure and a second rectangular signal ground which are sequentially arranged; the first rectangular shape signalized and the second rectangular shape signalized are symmetrical about a long rectangular-to-equilateral triangle combined transition structure; the long rectangular to equilateral triangle combined transition structure supports a coplanar waveguide feed form for high frequency signals through the antenna.
Further, the conductivity of graphite in the graphite radiation structure is 2×10 6 On the order of S/m, the thickness of graphite is 25um.
Further, the long rectangle-equilateral triangle combined transition structure is specifically formed by combining and connecting a long rectangle and an equilateral triangle; the equilateral triangle combination is connected with the wide side of the long rectangle; the equilateral triangle combination comprises a primary equilateral triangle and 2 secondary equilateral triangles; the bottom edge of the primary equilateral triangle is connected with 2 secondary equilateral triangles; wherein, the interior of the primary equilateral triangle is subtracted by the equilateral triangle with the side length w7, and meanwhile, the 2 equilateral triangles with the side length w5 are subtracted from the 2 base angles of the primary equilateral triangle.
Further, the first rectangular-shaped signalized, long rectangular-to-equilateral triangle combined transition structure and the second rectangular-shaped signalized are arranged along the same plane; by adjusting the size of the antenna, 50 omega characteristic impedance is realized, the antenna has omnidirectional radiation characteristics, and the antenna works in an ISM frequency band;
the method for adjusting the size comprises the following steps: the method comprises the steps of keeping the dimensions of a first rectangular shape signal ground, a long rectangular-equilateral triangle combined transition structure and a second rectangular shape signal ground unchanged, adjusting the distance d1 between the first rectangular shape signal ground and the long rectangular-equilateral triangle combined transition structure, wherein the distance is also the distance between the second rectangular shape signal ground and the long rectangular-equilateral triangle combined transition structure, calculating to obtain antenna characteristic impedance, realizing 50 omega characteristic impedance, having omnidirectional radiation characteristics and working in an ISM frequency band.
Further, the first rectangular-shaped signalized, long rectangular-to-equilateral triangle combined transition structure and the second rectangular-shaped signalized are arranged along an irregular curved surface; the curvature radius of the wearable antenna is consistent with the curvature radius of the surface of the human body to which the wearable antenna is attached.
Further, the wearable antenna operates in the ISM band and has an operating bandwidth above 600 MHz.
Further, the thickness of the braid substrate structure is 0.25mm.
Further, the antenna is connected with the testing equipment through an SMA interface.
The invention provides a preparation method of a broadband omnidirectional wearable antenna based on graphite, which comprises the following steps:
step one: printing the two-dimensional size of the graphite radiation structure on paper according to the ratio of 1:1;
step two: attaching a graphite film on a polyimide film, and then gluing the whole graphite film with the paper printed in the step one, wherein the gluing surface is the contact surface of the paper and the polyimide film;
step three: dividing the integral structure obtained by gluing in the step two along the outline of the graphite radiation structure, and removing paper and polyimide film to obtain the graphite radiation structure;
step four: and (3) adhering the graphite radiation structure obtained in the step (III) to a braided fabric substrate to obtain the wideband omnidirectional wearable antenna based on graphite.
And further, after adhesion in the step four, the edge of the braided fabric substrate is flush with a coplanar waveguide feed port of the graphite radiation structure.
The beneficial effects of the invention are as follows:
(1) The graphite-based wearable antenna designed by the invention has the characteristics of wide frequency band, omnidirectional radiation, low profile and physical and chemical stability. The deformation curvature radius (rc) of the wearable antenna is changed, so that the wearable antenna is attached to the surface of a human body and conformal, and the wearable antenna has the characteristic of easy conformal.
(2) The preparation method is simple and convenient, and can meet the application requirements of the technical field of wearable communication.
Drawings
FIG. 1 is a diagram of a graphite-based planar wearable band antenna structure;
FIG. 2 is a graph of graphite-based planar wearable band antenna bandwidth simulation results;
FIG. 3 is a graph of simulation results of radiation performance of a graphite-based planar wearable band antenna; fig. 3 (a) shows the radiation performance simulation result of the E plane; fig. 3 (B) shows simulation results of radiation performance of the H plane;
FIG. 4 is a diagram of a graphite-based curved wearable band antenna structure;
FIG. 5 is a graph of simulation results of graphite-based curved wearable band antenna bandwidth;
FIG. 6 is a graph of simulation results of radiation performance of a curved wearable band antenna based on graphite; fig. 6 (a) shows the radiation performance simulation result of the E plane; fig. 6 (B) shows the radiation performance simulation result of the H plane;
FIG. 7 is a prepared graphite-based wearable antenna object;
FIG. 8 is a graph of typical scenario bandwidth test results for a prepared graphite-based wearable band antenna; fig. 8 (a) shows the test result of the antenna in air; fig. 8 (B) shows the test result of the antenna on the arm; fig. 8 (C) shows the test result of the antenna on the chest; fig. 8 (D) shows the test result of the antenna on the thigh.
Detailed Description
For a better understanding of the technical features, objects and effects of the present invention, the present invention will be described in more detail below with reference to fig. 1 to 8 with respect to ISM band wearable antennas. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. It should be noted that the structural figures in these drawings are all in very simplified form and all use non-precise proportions, only for convenience and clarity in assisting in explaining the effects of the present invention.
Firstly, designing and optimizing a graphite-based planar wearable antenna to obtain basic design parameters of the antenna; then, considering the conformal deformation effect of the wearable antenna, designing the wearable antenna with a conformal curved surface, obtaining electromagnetic performance simulation parameters of the antenna, and judging that the antenna meets the design requirement; on the basis, the preparation of the wearable antenna based on graphite is carried out, and the typical scene test analysis is carried out.
The invention provides a graphite-based wideband omnidirectional wearable antenna adopting a coplanar waveguide structure, which is shown in figure 1 and comprises a graphite radiation structure and a braided fabric substrate structure; the graphite radiation structure is adhered with the braided fabric substrate structure. The black part of fig. 1 is a graphite radiating structure, and the white part of fig. 1 is a braid substrate.
The graphite radiating structure comprises 3 parts, namely 2 rectangular signal grounds, and 1 long rectangular-to-equilateral triangle combined transition structure, and the structure walks the antenna high-frequency signal. Parameters describing the graphite radiation structure are l1, l2, d1, d2, d3, w1, w2, w3, w4, w5, w6, w7 and theta 1, wherein the parameters describing the rectangular shape signal ground are l1, w1, and represent the length and width of the rectangular shape signal ground; parameters describing the long rectangle-to-equilateral triangle combined transition structure comprise l1, l2, d2, d3, w2, w3, w4, w5, w6, w7, and θ1, and the long width dimension of the long rectangle in the structure and the equilateral triangle combined dimension information. Where l1 is the length of the rectangular signal ground, and w1 is the width of the rectangular signal ground. l2 is the difference between the length of the rectangular signal ground and the length of the long rectangle of the combined transition structure from the long rectangle to the equilateral triangle. w2 is the width of the long rectangle to equilateral triangle combined transition structure. d1 is the distance between the rectangular signal ground and the combined transition structure from the long rectangle to the equilateral triangle. d2 is the interval between the inner side of the primary equilateral triangle and the rear bottom edge of the equilateral triangle; d3 is the spacing formed by 2 secondary equilateral triangles. w3 is the side length of the bottom corner of the primary equilateral triangle minus the equilateral triangle; w4 is the side length of the secondary equilateral triangle; w5 is the side length of the equilateral triangle subtracted from the bottom corner of the primary equilateral triangle; w6 is the side length of the secondary equilateral triangle; w7 is the side length of the equilateral triangle subtracted from the interior of the primary equilateral triangle; θ1 is an angle formed by the first-order equilateral triangle and the rectangular signal.
The graphite radiating structure is the primary radiating structure of the antenna.Wherein the conductivity of graphite is 2×10 6 The S/m order, the thickness of graphite is about 25um. The graphite radiation structure adopts a coplanar waveguide form and comprises a first rectangular signal ground, a long rectangular-to-equilateral triangle combined transition structure and a second rectangular signal ground which are sequentially arranged. The first rectangular shape signalized and the second rectangular shape signalized are symmetrical about the long rectangular to equilateral triangle composite transition structure and are identical in shape. The long rectangular to equilateral triangle combined transition structure supports a coplanar waveguide feed form for high frequency signals through the antenna.
The long rectangle-equilateral triangle combined transition structure is specifically formed by combining and connecting a long rectangle and an equilateral triangle; the equilateral triangle combination is connected with the wide side of the long rectangle; the equilateral triangle combination comprises a primary equilateral triangle and 2 secondary equilateral triangles; the bottom edge of the primary equilateral triangle is connected with 2 secondary equilateral triangles. Wherein, the interior of the primary equilateral triangle is subtracted by the equilateral triangle with the side length w7, and meanwhile, the 2 equilateral triangles with the side length w5 are subtracted from the 2 base angles of the primary equilateral triangle.
The graphite radiation structure realizes 50 omega characteristic impedance by adjusting the coplanar waveguide structure, the adjustment and matching method is to keep the dimensions of the first rectangular shape signal ground, the long rectangular-equilateral triangle combined transition structure and the second rectangular shape signal ground unchanged, adjust the distance d1 between the first rectangular shape signal ground and the long rectangular-equilateral triangle combined transition structure, and the distance is also the distance between the second rectangular shape signal ground and the long rectangular-equilateral triangle combined transition structure, and the characteristic impedance of the antenna can be calculated by a simulation method, so as to meet the design requirement. The long rectangular-equilateral triangle combined transition structure has omnidirectional radiation characteristics by adjusting the size of the long rectangular-equilateral triangle combined transition structure, and the antenna works in an ISM frequency band.
The braided fabric substrate structure provides support for the graphite radiation structure, and common textiles (polyester, cotton cloth and the like) are selected. The graphite radiating structure is bonded to the braid substrate. The braided fabric substrate structure is soft and bendable, and is easy to be attached and conformal with the surface of a human body. The thickness of the braided fabric substrate structure is 0.25mm, and the thickness of the wearable antenna formed by the final graphite radiation structure and the braided fabric substrate is small, the section is low, and the wearable antenna can be conformal with different structures on the surface of a human body.
Referring to fig. 2, the above-mentioned variable adjustment parameters are analyzed and optimized through simulation, and finally the wearable antenna parameters meeting the design requirements are obtained. The optimized wearable antenna based on graphite works at 2.4GHz, the frequency band is 1.6 GHz-3.6 GHz, the requirement of working in an ISM frequency band is met, and the antenna has the working bandwidth above 600 MHz. Referring to fig. 3, the radiation performance simulation result of the graphite-based planar wearable antenna is shown in fig. 3, where (B) in fig. 3 is the radiation performance simulation result of the H-plane antenna pattern, so that the radiation performance of the graphite-based planar wearable antenna satisfies the omnidirectional characteristic.
Further, the wearable antenna needs to be attached and conformal in the practical application process, so that the wearable antenna is changed into an irregular curved surface structure from a planar structure, and new parameters need to be established to control and describe deformation of the wearable antenna. Because the graphite material has the characteristic of being bendable, the graphite wearable antenna can be directly bent to be attached to the surface of a human body. The main control parameter is the deformation radius of curvature (rc) of the wearable antenna. Readjusting parameters l1, l2, d1, d2, d3, w1, w2, w3, w4, w5, w6, w7, theta 1, rc of the wearable antenna to enable the parameters to be fit and conformal with the human body surface, wherein the bending curvature radius of the wearable antenna is consistent with the curvature radius of the human body surface to which the wearable antenna is fit, and the electromagnetic performance requirement of the wearable antenna is met.
Referring to fig. 4, the curved wearable antenna based on graphite is curved from left to right in the figure, and the curved wearable antenna is stretched to a plane with a size consistent with fig. 1.
Referring to fig. 5, the graphite-based curved surface wearable antenna works at 2.4GHz, the frequency band is 1.4 GHz-3.5 GHz, and the requirement of working in an ISM frequency band is met. Fig. 6 is a graph of simulation results of radiation performance of the curved wearable band antenna based on graphite, see the H-plane antenna pattern of fig. 6 (B), so that radiation performance of the curved wearable band antenna based on graphite satisfies omnidirectional characteristics.
The invention provides a preparation method of a wideband omnidirectional wearable antenna based on graphite, which specifically comprises the following steps:
step one: printing the two-dimensional size of the graphite radiation structure part in the designed and optimized wearable antenna on A4 paper according to the ratio of 1:1;
step two: attaching a whole graphite film on a polyimide film, and then gluing the whole graphite film with the A4 paper in the step one, wherein the gluing surface is the contact surface of the A4 paper and the polyimide film, so that the graphite film, the polyimide film and the A4 paper form a whole, and the A4 paper surface printed with the graphite radiation structure is exposed;
step three: dividing the overall structure obtained by the second gluing along the outline of the graphite radiation structure on the A4 paper, sequentially removing the A4 paper sheet and the polyimide film, and finally obtaining the graphite radiation structure; the device comprises a first rectangular signal ground, a long rectangular-equilateral triangle combined transition structure and a second rectangular signal ground which are sequentially arranged on the same plane;
step four: and (3) adhering the graphite radiation structure obtained in the step (III) to a braided fabric substrate, keeping the edge of the braided fabric substrate flush with a coplanar waveguide feed port of the graphite radiation structure, and finally obtaining the wideband omnidirectional wearable antenna based on graphite.
Referring to fig. 7, the wearable antenna based on graphite comprises two parts, wherein the gray black part is a graphite radiation structure, the white part is a braided fabric substrate, and the two parts are adhered and bonded to form the whole wearable antenna. The wearable antenna based on graphite can be attached and conformal with the surface of a human body, has comfortableness and keeps the stability of physical and chemical characteristics.
Further, in order to test the performance of the graphite wearable antenna prepared in the fourth step, an SMA interface needs to be arranged at the coplanar waveguide feed port of the graphite radiating structure. The invention adopts a mechanical stress connection mode to connect the signal wire of the SMA adapter to the long rectangular-equilateral triangle combined transition structure of the graphite radiation structure, and respectively connects the ground wire of the SMA adapter to the signal ground of the graphite radiation structure.
See the metallic colored portion of fig. 7, which is the SMA interface mechanically connected to the wearable antenna. The SMA conversion interface can be connected with a universal test cable to test instrument equipment to complete performance test of the wearable antenna.
Further, the electromagnetic bandwidth test of the graphite-based wearable antenna is to connect the antenna SMA adapter to a test cable that is in turn connected to a vector network analyzer. Before formal measurement, the influence of a test cable is eliminated for calibration through a built-in calibration program of a vector network analyzer, and then the bandwidth test of the wearable antenna is carried out. The scenario of the test includes placing the wearable antenna in air, on the arm, on the chest, and on the thigh.
Referring to fig. 8, the working frequency of the graphite-based wearable antenna in the air is 2.4GHz, the working bandwidth is 2.1 GHz-2.7 GHz, and the requirement of working in an ISM frequency band is met; the working frequency on the arm is 2.25GHz, the working bandwidth is 1.7 GHz-3.07 GHz, and the requirement of working in an ISM frequency band is met; the working frequency on the chest is 2.45GHz, the working bandwidth is 1.6 GHz-3.1 GHz, and the requirements of working in an ISM frequency band are met; the working frequency on the chest is 2GHz, the working bandwidth is 1.3 GHz-5 GHz, and the requirements of working in the ISM frequency band are met.
Further, the radiation characteristic test of the wearable antenna based on graphite is to connect the antenna SMA adapter to a test cable, the test cable is connected to a spectrum analyzer again, and the received signal power of the wearable antenna in the ISM frequency band is tested. Meanwhile, under the same test condition, the test cable is connected with the standard rubber stick antenna which works at 2.4GHz, the received signal power of the standard rubber stick antenna under the ISM frequency band is tested, the signals received by the two antennas are compared, and the radiation performance of the wearable antenna is judged. The actual test results are: in the air, the power received by the wearable antenna based on graphite is 1dB higher than the power received by the standard rubber rod antenna, and the good antenna radiation performance of the wearable antenna based on graphite is reflected.
According to the design and preparation method of the graphite-based broadband omnidirectional wearable antenna, a graphite-based planar wearable antenna is designed and optimized at first, and basic design parameters of the antenna are obtained; then, considering the conformal deformation effect of the wearable antenna, designing the wearable antenna with a conformal curved surface, obtaining electromagnetic performance simulation parameters of the antenna, and judging that the antenna meets the design requirement; on the basis, the preparation of the wearable antenna based on graphite and the connection of corresponding test interfaces are carried out, and the typical scene test and analysis are carried out. The graphite-based wearable antenna designed by the invention has the characteristics of wide frequency band, omnidirectional radiation, low profile, easy conformal and the like, has stable electromagnetic performance, is simple and convenient to prepare, and can meet the application requirements of the technical field of wearable communication.
The above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto. The structural dimensions, electromagnetic parameters, graphite thickness, braid substrate type and thickness, and the like of the graphite radiating portion in the wearable antenna employed in the present invention are not limited to the specific description in the embodiments. The design and preparation method of the wideband omnidirectional wearable antenna based on graphite is not limited to a coplanar waveguide structure, and is also applicable to other types of planar antennas. Various equivalent modifications and substitutions will occur to those skilled in the art, and these are intended to be included within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (9)
1. The wideband omnidirectional wearable antenna based on graphite is characterized by comprising a graphite radiation structure and a braided fabric substrate structure; the graphite radiation structure is adhered with the braided fabric substrate structure; the graphite radiation structure adopts a coplanar waveguide form and comprises a first rectangular signal ground, a long rectangular-to-equilateral triangle combined transition structure and a second rectangular signal ground which are sequentially arranged; the first rectangular shape signalized and the second rectangular shape signalized are symmetrical about a long rectangular-to-equilateral triangle combined transition structure; the long rectangular-equilateral triangle combined transition structure supports a coplanar waveguide feed form and is used for passing high-frequency signals of the antenna;
the long rectangle-equilateral triangle combined transition structure is specifically formed by combining and connecting a long rectangle and an equilateral triangle; the equilateral triangle combination is connected with the wide side of the long rectangle; by a means ofThe equilateral triangle combination comprises a primary equilateral triangle and 2 secondary equilateral triangles; the bottom edge of the primary equilateral triangle is connected with 2 secondary equilateral triangles; wherein the internal minus side length of the primary equilateral triangle isw7, while subtracting 2 side lengths from 2 base angles of the primary equilateral trianglew5 equilateral triangle.
2. The graphite-based wideband omni-directional wearable antenna of claim 1, wherein the graphite in the graphite radiating structure has a conductivity of 2 x 10 6 On the order of S/m, the thickness of graphite is 25um.
3. The graphite-based wideband omni-directional wearable antenna of claim 1, wherein the first rectangular shaped signalized, long rectangular to equilateral triangle composite transitional structure and the second rectangular shaped signalized are arranged along a same plane; by adjusting the size of the antenna, 50 omega characteristic impedance is realized, the antenna has omnidirectional radiation characteristics, and the antenna works in an ISM frequency band;
the method for adjusting the size comprises the following steps: the dimensions of the first rectangular shape signal ground, the long rectangular-to-equilateral triangle combined transition structure and the second rectangular shape signal ground are kept unchanged, and the distance between the first rectangular shape signal ground and the long rectangular-to-equilateral triangle combined transition structure is adjustedd1, the distance is also the distance between the second rectangular signal ground and the combined transition structure from the long rectangle to the equilateral triangle, the characteristic impedance of the antenna is obtained through calculation, the 50 omega characteristic impedance is realized, the omnidirectional radiation characteristic is realized, and the antenna works in an ISM frequency band.
4. The graphite-based wideband omni-directional wearable antenna of claim 1, wherein the first rectangular shaped signalized, long rectangular to equilateral triangle composite transitional structure and the second rectangular shaped signalized are arranged along an irregular curved surface; the curvature radius of the wearable antenna is consistent with the curvature radius of the surface of the human body to which the wearable antenna is attached.
5. The graphite-based wideband omni-directional wearable antenna of claim 1, wherein the wearable antenna operates in the ISM band and has an operating bandwidth above 600 MHz.
6. The graphite-based wideband omni-directional wearable antenna of claim 1, wherein the thickness of the braid substrate structure is 0.25mm.
7. The graphite-based wideband omni-directional wearable antenna of claim 1, wherein the antenna is connected to a test device through an SMA interface.
8. A method for manufacturing the graphite-based wideband omnidirectional wearable antenna of claim 1, comprising the steps of:
step one: printing the two-dimensional size of the graphite radiation structure on paper according to the ratio of 1:1;
step two: attaching a graphite film on a polyimide film, and then gluing the whole graphite film with the paper printed in the step one, wherein the gluing surface is the contact surface of the paper and the polyimide film;
step three: dividing the integral structure obtained by gluing in the step two along the outline of the graphite radiation structure, and removing paper and polyimide film to obtain the graphite radiation structure;
step four: and (3) adhering the graphite radiation structure obtained in the step (III) to a braided fabric substrate to obtain the wideband omnidirectional wearable antenna based on graphite.
9. The method for manufacturing a wideband omnidirectional wearable antenna based on graphite of claim 8, wherein the edge of the braid substrate is flush with the coplanar waveguide feed port of the graphite radiating structure after adhesion in the fourth step.
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