CN120601134A - Wearable button antenna - Google Patents
Wearable button antennaInfo
- Publication number
- CN120601134A CN120601134A CN202510825175.4A CN202510825175A CN120601134A CN 120601134 A CN120601134 A CN 120601134A CN 202510825175 A CN202510825175 A CN 202510825175A CN 120601134 A CN120601134 A CN 120601134A
- Authority
- CN
- China
- Prior art keywords
- antenna
- patch
- body surface
- wearable
- button
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
-
- 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
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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
- H01Q5/30—Arrangements for providing operation on different wavebands
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- 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
Landscapes
- Waveguide Aerials (AREA)
Abstract
本发明提供一种可穿戴纽扣天线，涉及无线通信技术领域，可穿戴纽扣天线包括：天线基板，所述天线基板的一侧设置有辐射贴片，所述天线基板的另一侧设置有接地面，所述辐射贴片电连接于所述接地面；体表织物，设置在待检测生物的体表；刚性同轴电缆，设置在所述接地面与所述体表织物之间，用于使所述接地面电连接于所述体表织物。本申请的可穿戴纽扣天线为硬质天线，因其紧凑结构和易于集成特性，成为无线体域网通信的理想选择，并且本申请提供的纽扣天线的结构紧凑、尺寸较小、造价低廉且性能稳定，不易损坏。
The present invention provides a wearable button antenna, which relates to the field of wireless communication technology. The wearable button antenna includes: an antenna substrate, one side of which is provided with a radiating patch, and the other side of which is provided with a ground plane, the radiating patch being electrically connected to the ground plane; a body surface fabric provided on the body surface of the organism to be detected; and a rigid coaxial cable provided between the ground plane and the body surface fabric, for electrically connecting the ground plane to the body surface fabric. The wearable button antenna of the present application is a rigid antenna. Due to its compact structure and easy integration, it is an ideal choice for wireless body area network communications. The button antenna provided by the present application is compact in structure, small in size, low in cost, stable in performance, and not easily damaged.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a wearable button antenna.
Background
The body area network is a communication network working near, on or in the human body (not limited to the human body), and utilizes a set of small, low-power consumption and intelligent sensors to monitor the information of the human body and the surrounding environment. In order to cope with the application requirements of the medical health field and the information and communication industry on human body communication, experts in charge of wireless personal area networks have formulated relevant technical standards of the personal area networks. Body area networks can be divided into wearable body area networks and implantable body area networks according to the equipment working area. In addition, since body area networks communicate around or in the human body, body area network systems require low transmit power, low power consumption, low profile, compactness, integration into fabrics, insignificant effects of the fuselage on characteristics, and so forth. With the rapid development of wireless body area networks (Wireless Body Area Network, WBAN), wearable wireless electronic devices are increasingly heavier in daily life. People can monitor the physiological health level of the human body through the wearable electronic equipment so as to ensure that early warning can be performed in time and the user can go to the hospital to seek medical attention as soon as possible when the human body health has a problem.
At present, textile fabrics and conductive fabrics are mostly adopted as a medium substrate and a radiation patch of an antenna, and the flexibility of the material ensures that the mechanical stability of the antenna is poor, so that the performance of the antenna is poor when the antenna is deformed, the working stability of the antenna is poor, and the antenna is easy to damage.
Disclosure of Invention
The invention provides a wearable button antenna which is used for solving the problems of poor working stability and easy damage of the antenna in the related technology.
The invention provides a wearable button antenna, comprising:
The antenna comprises an antenna substrate, wherein one side of the antenna substrate is provided with a radiation patch, the other side of the antenna substrate is provided with a grounding surface, and the radiation patch is electrically connected to the grounding surface;
the body surface fabric is arranged on the body surface of the organism to be detected;
And the rigid coaxial cable is arranged between the ground plane and the body surface fabric and is used for electrically connecting the ground plane to the body surface fabric.
According to the wearable button antenna provided by the invention, the radiation patch is connected with the ground plane through the short-circuit column to form a PIFA antenna structure for generating in-vitro directional radiation;
and/or the ground plane is connected with the body surface fabric through the rigid coaxial cable to form a monopole-like structure for generating horizontal omnidirectional radiation.
In the embodiment of the application, at least one of a PIFA antenna structure and a monopole-like structure can be included in the wearable button antenna. In addition, the grounding surface on the other side of the antenna substrate is connected with the body surface fabric through a rigid coaxial cable to jointly form a monopole-like structure, low-frequency horizontal omnidirectional radiation can be generated, and the antenna can vertically polarize along the body surface of the organism to be detected so as to realize body surface communication. In the wearable button antenna, the PIFA antenna structure and the monopole-like structure are combined together skillfully, so that the dual-frequency dual-mode is realized, and the requirement of smaller size is met.
According to the wearable button antenna provided by the invention, the body surface fabric comprises a conductive fabric and a textile fabric;
The conductive fabric is arranged on one side far away from the body surface of the organism to be detected and is used for being electrically connected with the rigid coaxial cable, and the textile fabric is arranged on one side close to the body surface of the organism to be detected and is used for being in contact with the body surface of the organism to be detected.
In an embodiment of the invention, a specific implementation mode of the body surface fabric is provided. The body surface fabric can comprise a conductive fabric and a textile fabric, wherein the conductive fabric can form a monopole-like structure together with a coaxial cable and a ground plane, an inverted top-load monopole antenna is formed and used for generating horizontal omnidirectional radiation and applied to body surface communication, the conductive fabric can also serve as a shielding layer to prevent the antenna from being influenced by organisms to be detected and frequency point offset, normal operation performance can be kept when the antenna is integrated with the organisms to be detected, in addition, the conductive fabric can be adhered to the textile fabric such as clothes, and the soft conductive fabric is integrated on the clothes to reduce uncomfortable feeling of the organisms to be detected.
According to the wearable button antenna provided by the invention, the frequency band of the in-vitro directional radiation generated by the PIFA antenna structure is higher than the frequency band of the horizontal omnidirectional radiation generated by the monopole-like structure.
According to the wearable button antenna provided by the invention, the radiation patch is provided with the first notch, and the first notch is used for adjusting the impedance of the button antenna so as to assist the impedance of the button antenna to be matched with the impedance of the rigid coaxial cable.
In the embodiment of the invention, the radiation patch is provided with the first notch for improving the impedance matching of the antenna, so that the comprehensive improvement of the power efficiency, the signal quality and the equipment safety is realized.
According to the wearable button antenna provided by the invention, one side of the bottom of the first notch is provided with the inclined plane.
In the embodiment of the invention, the mode of arranging the chute is beneficial to further improving the impedance matching of the antenna.
According to the wearable button antenna provided by the invention, the radiation patch is further provided with the second notch, and the second notch is used for prolonging the current path of the high-frequency band so as to adjust the high-frequency band where the in-vitro directional radiation generated by the button antenna is located.
In the embodiment of the invention, the radiation patch is further provided with a second notch for extending the current path of the high-frequency band so as to adjust the high-frequency band where the in-vitro directional radiation generated by the button antenna is located, so that the high-frequency band is located in the communication band specified by the communication standard.
According to the wearable button antenna provided by the invention, the second notch is provided as the rectangular groove, and one side of the opening of the rectangular groove is provided with the bulge facing the other side so as to semi-close the rectangular groove.
In the embodiment of the invention, the special structure of the semi-closed rectangular groove is used for changing the current path of the high frequency band, and particularly can improve the cross polarization of the 5.8GHz resonance point of the high frequency band.
According to the wearable button antenna provided by the invention, the parasitic patch is arranged on the side, provided with the radiation patch, of the antenna substrate, the parasitic patch is not contacted with the radiation patch, and the impedance of the button antenna is adjusted through coupling between the parasitic patch and the radiation patch so as to assist the impedance of the button antenna to be matched with the impedance of the rigid coaxial cable.
In the embodiment of the invention, the parasitic patch is also arranged on the antenna substrate, and the parasitic patch is not contacted with the radiation patch, but the impedance of the button antenna is regulated through coupling connection between the parasitic patch and the radiation patch, so that the impedance of the button antenna is matched with the impedance of the rigid coaxial cable, the impedance matching of the antenna is improved, and the comprehensive promotion of power efficiency, signal quality and equipment safety is realized.
According to the wearable button antenna, the side, close to the parasitic patch, of the radiation patch is further provided with the protrusion to serve as the first coupling portion, the parasitic patch is U-shaped, the U-shaped portion serves as the second coupling portion, and the first coupling portion is in coupling connection with the second coupling portion.
In an embodiment of the invention, a specific implementation of coupling between a radiating patch and a parasitic patch is provided. The side of the specific radiation patch, which is close to the parasitic patch, is also provided with a bulge, the bulge is used as a first coupling part, the parasitic patch is U-shaped, the U-shaped part is used as a second coupling part, and the first coupling part and the second coupling part are connected in a coupling way, so that the coupling between the radiation patch and the parasitic patch is realized, and the impedance matching of the antenna is improved.
Compared with the prior art that the textile fabric and the conductive fabric are adopted as the medium substrate and the radiation patch of the antenna, the soft antenna is easy to deform, so that the problems of poor performance, poor working stability, easy damage and the like of the antenna are caused, the wearable button antenna provided by the application is a hard antenna, becomes an ideal choice for wireless body area network communication due to the compact structure and easy integration characteristic, in the button antenna provided by the application, the body surface fabric is arranged on the body surface of the organism to be detected and is connected with the antenna substrate through the rigid coaxial cable, the two sides of the antenna substrate are respectively provided with the radiation patch and the grounding surface, and the radiation patch and the grounding surface can emit radiation through electric connection.
Drawings
In order to more clearly illustrate the invention or the technical solutions in the related art, the following description will briefly explain the drawings used in the embodiments or the related art description, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic structural diagram of a wearable button antenna provided by the invention;
fig. 2 is a top view of an antenna substrate in a wearable button antenna provided by the invention;
fig. 3 is a bottom view of an antenna substrate in a wearable button antenna provided by the invention;
fig. 4 is a schematic structural diagram of the wearable button antenna provided by the invention arranged on the surface of human tissue;
FIG. 5 is a radiation pattern of the YOZ plane of the wearable button antenna provided by the invention at 2.45 GHz;
FIG. 6 is a radiation pattern of the XOY face at 2.45GHz for a wearable button antenna provided by the present invention;
FIG. 7 is a radiation pattern of the XOZ face of the wearable button antenna provided by the invention at 5.8 GHz;
FIG. 8 is a radiation pattern of the YOZ plane of the wearable button antenna provided by the invention at 5.8 GHz;
FIG. 9 is a graph of S-parameters of the wearable button antenna provided by the invention in a free space state and loaded with a human tissue model;
fig. 10 is a SAR graph of a wearable button antenna provided by the present invention loaded with a human tissue model at 2.45 GHz.
Reference numerals:
100 parts of antenna base plate, 200 parts of body surface fabric and 300 parts of rigid coaxial cable;
101, a radiation patch, 102, a ground plane, 103, a short-circuit column, 104, a parasitic patch, 201, a conductive fabric and 202, a textile fabric;
1, a first notch, 2, a second notch, 3, skin, 4 fat and 5, muscle;
6, a first mounting hole, 7, a second mounting hole, 8, a third mounting hole and 9, a feed hole;
10, irregular rectangular patch;
A is a bulge, B is a first coupling part, and C is a second coupling part.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be clearly understood that terms such as "vertical", "horizontal", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of describing the present invention, and do not mean that the apparatus or element referred to must have a specific orientation or position, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, directly connected, indirectly connected through an intermediate medium, and in communication with each other between two elements, and may be a wireless connection or a wired connection. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the related art, textile fabrics and conductive fabrics which are soft and easy to deform are mostly adopted as a medium substrate and a radiation patch of the antenna, but the flexibility of the material can cause the performance of the antenna to be poor when the antenna is deformed.
In view of the above problems, the button antenna is found to be a hard antenna, and is an ideal choice for wireless body area network communication due to its compact structure and easy integration characteristics. In order to solve the problem that the performance is easily affected when the antenna material is deformed due to softness, the application provides a wearable button antenna.
The wearable button antenna of the present invention is described below with reference to the accompanying drawings.
The embodiment of the invention provides a wearable button antenna. Fig. 1 is a schematic structural diagram of a wearable button antenna provided by the present invention, fig. 2 is a top view of an antenna substrate in the wearable button antenna provided by the present invention, fig. 3 is a bottom view of the antenna substrate in the wearable button antenna provided by the present invention, and as shown in fig. 1 to 3, the wearable button antenna includes:
An antenna substrate 100, wherein a radiation patch 101 is disposed on one side of the antenna substrate 100, a ground plane 102 is disposed on the other side of the antenna substrate 100, and the radiation patch 101 is electrically connected to the ground plane 102;
A body surface fabric 200 disposed on a body surface of a living being to be detected;
A rigid coaxial cable 300, said rigid coaxial cable 300 being disposed between said ground plane 102 and said body surface fabric 200 for electrically connecting said ground plane 102 to said body surface fabric 200.
The antenna substrate 100 may be used as a carrier of an antenna to support the radiation patch 101 and the ground plane 102.
In some embodiments, the antenna substrate 100 may be an F4BM220 having a dielectric constant of 2.2 and a loss tangent of 0.0009, which is only illustrated herein and the present application is not limited thereto.
The radiating patch 101 is a main radiating element of the antenna, for example, a copper sheet, and its shape (for example, rectangular, circular, etc.) and size determine parameters such as a resonant frequency and a radiating direction of the antenna. In addition, the design of the radiating patch 101 may also affect the polarization (e.g., linear polarization, circular polarization, etc.) and the radiation pattern (directional or omnidirectional).
It should be noted that, the ground plane 102 is, for example, a copper sheet, and the ground plane 102 is used as a metal bottom layer of the antenna, and its function is divided into two parts, 1) the function in the low frequency band is used as a series capacitive load to improve impedance matching in the low frequency band, and 2) the function in the high frequency band is used as a reflection plate of the PIFA structure, and reflects radiation in the high frequency band to generate directional radiation.
In other embodiments, a specific implementation manner of placing the wearable button antenna on human tissue is provided, fig. 4 is a schematic structural diagram of the wearable button antenna provided by the present invention disposed on a surface of human tissue, as shown in fig. 4, and the body surface fabric 200 of the wearable button antenna is configured to be disposed above the skin 3 and may contact the skin 3, where the skin 3, the fat 4, and the muscle 5 are equivalent to a human body structure.
Compared with the prior art that the textile fabric and the conductive fabric are adopted as the medium substrate and the radiation patch of the antenna, the wearable button antenna provided by the embodiment of the application has the advantages that the soft antenna is easy to deform, further the problems of poor performance, poor working stability, easy damage and the like of the antenna are caused, the wearable button antenna provided by the application is a hard antenna, and becomes an ideal choice for wireless body area network communication due to the compact structure and easy integration characteristic, in the button antenna provided by the application, the body surface fabric 200 is arranged on the body surface of a living being to be detected and is connected to the antenna substrate 100 through the rigid coaxial cable 300, the radiation patch 101 and the grounding surface 102 are respectively arranged on two sides of the antenna substrate 100, and the radiation patch 101 and the grounding surface 102 can emit radiation through electric connection.
In some embodiments, as shown in fig. 1 to 3, the radiation patch 101 is connected to the ground plane 102 through a shorting post 103, and forms a PIFA (PLANAR INVERTED-F Antenna) Antenna structure for generating the directional radiation in vitro;
And/or, the ground plane 102 is connected to the body surface fabric 200 by the rigid coaxial cable 300 to form a monopole-like structure for generating horizontal omnidirectional radiation.
Specifically, the radiation patch 101 is connected with the ground plane 102 through the short-circuit column 103, so as to form a PIFA antenna structure, and the PIFA is a miniaturized antenna structure applied to mobile communication equipment, and is characterized in that the balance of compact size and high-efficiency performance is realized through unique geometric design, and the radiation patch can generate high-gain in-vitro directional radiation, and the radiation direction is perpendicular to the body surface of the living being to be detected so as to realize in-vitro communication.
In addition, the ground plane 102 is connected with the body surface fabric 200 through the rigid coaxial cable 300, and can form a monopole-like structure, wherein the monopole-like structure is a radiation structure which evolves or has similar functions on the basis of a monopole antenna, and the monopole-like structure is characterized in that the external conductor of the rigid coaxial cable 300 is connected with the ground plane 102 and the conductive fabric to form a monopole radiation structure, and the monopole radiation structure is particularly used for generating horizontal omnidirectional radiation, and the radiation is vertically polarized along the body surface of a living body to be detected so as to realize body surface communication.
In some embodiments, the frequency band of the off-body directional radiation generated by the configured PIFA antenna structure is higher than the frequency band of the horizontal omnidirectional radiation generated by the configured monopole-like structure.
For example, the frequency band of the in-vitro directional radiation generated by the PIFA antenna structure can be 5.8GHz and applied to in-vitro transmission, and the frequency band of the horizontal omnidirectional radiation generated by the monopole-like structure can be 2.45GHz and applied to human body detection, which is only an example, and the application is not limited in this respect.
In the embodiment of the application, at least one of a PIFA antenna structure and a monopole-like structure can be included in the wearable button antenna. In addition, the grounding surface on the other side of the antenna substrate is connected with a body surface fabric through a rigid coaxial cable to jointly form a monopole-like structure, low-frequency horizontal omnidirectional radiation can be generated, and the antenna is vertically polarized along the body surface of the organism to be detected so as to realize body surface communication. In the wearable button antenna, the PIFA antenna structure and the monopole-like structure are combined together skillfully, so that the dual-frequency dual-mode is realized, and the requirement of smaller size is met.
In some embodiments, a specific implementation of body surface fabric 200 is provided. As shown in fig. 1 to 3, the body surface fabric 200 includes a conductive fabric 201 and a woven fabric 202, the conductive fabric 201 is disposed at a side far from the body surface of the living being to be detected for electrical connection with the rigid coaxial cable 300, and the woven fabric 202 is disposed at a side near the body surface of the living being to be detected for contact with the body surface of the living being to be detected.
For example, a layer of textile fabric 202 having a thickness of 3mm may be disposed below the antenna substrate 100 at a distance of 10.5mm, the textile fabric 202 having a relative dielectric constant of, for example, 1.4 and a dielectric loss tangent of 0.044, and an upper layer of the textile fabric 202 covered with a conductive fabric 201 having a conductivity of, for example, SHIELDITTMSUPER and a thickness of 1.18×105S/m, the conductive fabric 201 being connected to a radiating patch below the dielectric substrate by a coaxial cable outer conductor.
In the embodiment of the invention, the specific body surface fabric 200 can comprise a conductive fabric 201 and a textile fabric 202, wherein the conductive fabric 201 can form a monopole-like structure together with the rigid coaxial cable 300 and the ground plane 102, and particularly forms an inverted top-loaded monopole antenna for generating horizontal omnidirectional radiation, the antenna can be applied to body surface communication, the conductive fabric 201 can also be used as a shielding layer for avoiding frequency point offset caused by the influence of organisms to be detected on the antenna, normal operation performance can be kept when the antenna is integrated with the organisms to be detected, in addition, the conductive fabric 201 can be adhered to the textile fabric 202 such as clothes, and the discomfort of the organisms to be detected can be reduced when the soft conductive fabric 201 is integrated on the clothes.
In some embodiments, as shown in fig. 2, the radiation patch 101 is provided with a first notch 1, and the first notch 1 is used for adjusting the impedance of the button antenna to assist the impedance of the button antenna to match the impedance of the rigid coaxial cable 300.
In some embodiments, as shown in fig. 2, an inclined surface is provided on one side of the bottom of the first slot 1.
In particular, by providing the chute, it is helpful to further improve the impedance matching of the antenna.
In the embodiment of the present invention, the radiation patch 101 is provided with the first notch 1, so as to improve impedance matching of the antenna, thereby realizing overall improvement of power efficiency, signal quality and equipment security.
In some embodiments, as shown in fig. 2, the radiation patch 101 is further provided with a second notch 2, where the second notch 2 is used to extend a current path of a high frequency band, so as to adjust the high frequency band where the in-vitro directional radiation generated by the button antenna is located.
It should be noted that extending the current path in the area of the limited radiation patch 101 equivalently increases the electrical length, so that the high-frequency resonance point shifts to a low frequency offset, which helps to expand the high-frequency bandwidth.
In some embodiments, a specific implementation of the second slot 2 is provided. As shown in fig. 2, the second notch 2 is provided as a rectangular groove, and one side of the opening of the rectangular groove is provided with a projection a toward the other side to semi-close the rectangular groove.
Specifically, the special structure of the semi-closed rectangular groove is used for changing the current path of the high frequency band, and can improve the cross polarization of the 5.8GHz resonance point of the high frequency band.
In the embodiment of the present invention, the radiation patch 101 is further provided with a second notch 2 for extending a current path of a high frequency band, so as to adjust the high frequency band where the in-vitro directional radiation generated by the button antenna is located, so that the high frequency band is located in a communication band specified by a communication standard.
In some embodiments, as shown in fig. 2, a parasitic patch 104 is further disposed on the antenna substrate 100 on the side on which the radiation patch 101 is disposed, the parasitic patch 104 is not in contact with the radiation patch 101, and the impedance of the button antenna is adjusted by coupling between the parasitic patch 104 and the radiation patch 101, so as to assist the impedance of the button antenna to match the impedance of the rigid coaxial cable 300.
In the embodiment of the invention, the parasitic patch 104 is further arranged on the antenna substrate 100, and the parasitic patch 104 is not in contact with the radiation patch 101, but the impedance of the button antenna is adjusted through coupling connection between the parasitic patch 104 and the radiation patch 101, so as to assist the impedance of the button antenna to match with the impedance of the rigid coaxial cable 300, improve the impedance matching of the antenna, and realize the comprehensive improvement of power efficiency, signal quality and equipment safety.
In some embodiments, a specific implementation of coupling between the radiating patch 101 and the parasitic patch 104 is provided. As shown in FIG. 2, a protrusion is further disposed on a side of the radiation patch 101 near the parasitic patch 104, and is used as a first coupling portion B, the parasitic patch is U-shaped, a portion of the U-shape is used as a second coupling portion C, and the first coupling portion B is coupled with the second coupling portion C.
In the embodiment of the present invention, a protrusion is further disposed on a side of the radiation patch 101 near the parasitic patch 104, as a first coupling portion B, the parasitic patch is in a U shape, and a U-shaped portion is used as a second coupling portion C, where the first coupling portion B and the second coupling portion C are coupled to implement coupling between the radiation patch 101 and the parasitic patch 104, so as to improve impedance matching of the antenna.
In some embodiments, as shown in fig. 2 and 3, the radiation patch 101 is further provided with a first mounting hole 6, and the ground plane 102 is correspondingly provided with a second mounting hole 7, and two ends of the short-circuit column 103 are respectively connected to the radiation patch 101 and the ground plane 102 through the first mounting hole 6 and the second mounting hole 7 so as to communicate the radiation patch 101 and the ground plane 102.
The first mounting hole 6 and the second mounting hole 7 are, for example, short-circuit holes.
In other embodiments, as shown in fig. 3, a third mounting hole 8 is further provided on the ground plane 102, and one end of the rigid coaxial cable 300 may be mounted in the third mounting hole 8 to be electrically connected to the ground plane 102.
The third mounting hole 8 is, for example, a ground hole.
The wearable button antenna provided by the embodiment of the invention is exemplified below.
In the related art, there are generally the following problems:
1) The traditional antenna supports a single frequency band, so that the dual-frequency communication requirement is difficult to meet;
2) The bandwidth is narrow, and the human body is easy to interfere when wearing;
3) Poor mechanical stability, and bending or extrusion tends to cause performance degradation;
4) The radiation pattern is fixed, and the body surface communication (omnidirectionality) and external connection (broadside) cannot be considered;
5) The impedance matching is deteriorated when the antenna is close to the human body, and the specific absorption rate (Specific Absorption Rate, SAR) value needs to be strictly controlled to ensure safety.
In view of the foregoing, there is a need for a button antenna that can operate efficiently in the 2.45GHz and 5.2GHz dual bands and that has good robustness. In order to effectively address these challenges, the invention realizes a compact dual-band dual-mode wearable button antenna, which better solves the problems and becomes a wearable antenna with good performance.
Specifically, as shown in fig. 1 to 4, the embodiment of the invention provides a dual-band dual-mode button antenna which is small in size, low in manufacturing cost and stable in performance and is suitable for a body area network, wherein the button antenna is used as a monopole to generate omnidirectional radiation which can be used for body surface communication in a low frequency band of 2.45GHz, and is used as a PIFA (planar inverted F) antenna in a high frequency band of 5.8GHz to generate directional radiation which is suitable for in-vitro communication, and the two antenna structures are combined together skillfully while the requirement of small size is met.
In order to achieve the above-mentioned object, the present invention provides a wearable button antenna made of hard material, which comprises an antenna substrate 100, a rigid coaxial cable 300, a body surface fabric 200 and a ground plane 102;
The impedance of the rigid coaxial cable 300 described above is 50 ohms (Ω) and may be allowed within certain tolerances.
The button antenna has a size of 13mm 1.5mm, and is a regular square frame, the antenna substrate 100 of the button antenna is F4BM220, the dielectric constant is 2.2, the loss tangent is 0.0009, the upper layer and the lower layer of the antenna substrate 100 are provided with radiation patches (the upper layer is considered as the radiation patch 101 and the lower layer is considered as the ground plane 102), a layer of textile fabric 202 with the thickness of 3mm is arranged below the substrate by a distance of 10.5mm, the relative dielectric constant of the textile fabric 202 is 1.4, the dielectric loss tangent is 0.044, the upper layer of the textile fabric 202 is covered with a layer of conductive fabric 201, for example SHIELDITTMSUPER, the conductivity is 1.18×105S/m, the thickness is 0.17mm, the conductive fabric 201 is connected with the radiation patch (namely the ground plane 102) below the antenna substrate 100 through the outer conductor of the rigid coaxial cable 300, the upper layer of the antenna substrate 100 is connected with the lower layer radiation patch (namely the radiation patch 101) through the short-circuit post 103, the antenna substrate 100 is connected with the lower layer radiation patch (namely the ground plane 102) at the same time, and the upper layer of the antenna substrate 100 is not contacted with the antenna substrate 100, and the parasitic patch 101 is not contacted with the antenna patch 100.
The upper layer radiation patch (i.e. the radiation patch 101) of the button antenna is processed by slotting both the left and right sides of the rectangular patch, the left side is provided with a chute (i.e. the first notch 1) to improve the impedance matching of the antenna, the right side is provided with an irregular rectangular slot (i.e. the second notch 2) to facilitate the extension of the current path of the high frequency band, and a parasitic patch 104 similar to a U-shaped structure is arranged beside the radiation patch 101 to further improve the impedance matching. The left side of the radiation patch 101 is connected with the short-circuit column 103 through a branch knot, the lower part of the short-circuit column 103 is connected with the grounding surface 102 positioned in the middle of the dielectric plate through a bent branch knot, the radiation patch 101 is connected with the grounding surface 102 through the short-circuit column 103 to form a PIFA antenna structure, high-gain in-vitro directional radiation is generated, and the outer conductor of the rigid coaxial cable 300 is simultaneously connected with the grounding surface 102 and the conductive fabric 201 to form a monopole-like structure, so that a horizontal omnidirectional radiation mode is generated and the radiation patch is applied to body surface communication.
Therefore, the embodiment of the invention adopts the design of the wearable button antenna, the input impedance of the feed point is standard 50Ω, and the conductive fabric 201 is used as the shielding layer to avoid frequency point offset caused by the influence of human body on the antenna, so that the normal operation performance of the antenna can be maintained when the antenna is integrated with the human body.
In addition, as shown in fig. 1 to fig. 4, the embodiment of the invention is a dual-frequency mode button antenna suitable for a body area network, the wearable button antenna is combined with buttons on clothes, the designed button antenna can be conveniently integrated on the clothes, fig. 1 and fig. 2 show front view and top view of the whole antenna, and fig. 3 is bottom view of a back substrate of the antenna. From the antenna substrate 100, at the top of the antenna substrate 100, the radiation patch 101 of the antenna is connected with the ground plane 102 at the bottom of the antenna substrate 100 through the short-circuit post 103 to form a PIFA antenna, meanwhile, the parasitic patch 104 at the top of the antenna substrate 100 improves the impedance matching of the antenna through coupling with the radiation patch 101, the radiation patch 101 is grooved to form a first notch 1 and a second notch 2, the radiation patch 101 is further provided with a feed hole 9, and the rigid coaxial cable 200 can be inserted into the feed hole. The first mounting hole 6 and the second mounting hole 7 are short circuit holes for connecting the radiation patch 101 and the ground plane 102 through the short circuit column 103, and the coupling patch part of the parasitic patch 104 in the shape of an L is connected with the irregular rectangular patch 10.
The antenna substrate 100, which is a button head, is connected by a rigid coaxial cable 300 as a whole, and the bottom of the rigid coaxial cable 300 is connected to the conductive fabric 201 and the woven fabric 202. The ground plane 102 at the bottom of the antenna substrate 100 is connected to the rigid coaxial cable 300 and the conductive fabric 201 through the third mounting hole 8 to form an inverted top-loaded monopole antenna.
The embodiment of the invention is a button antenna applied to the wearable field, so that the performance of the button antenna on human tissues is simulated as shown in fig. 4, and the skin 3, the fat 4 and the muscle 5 are equivalent to human structures. Human body data are detected through low-frequency omnidirectional radiation, and the data detected by the antenna and the receiving equipment outside the body are transmitted through high-frequency directional radiation and processed.
The embodiment of the invention relates to a dual-frequency dual-mode button antenna applied to the field of body area networks, and in order to be better integrated on a human body, the invention provides a small-size square button antenna, the button antenna can be integrated on clothes through a rigid coaxial cable 300, the rigid coaxial cable 300 can be just used as a support, a conductive fabric 201 can be adhered on the clothes, and the integration of the soft conductive fabric 201 on the clothes can reduce uncomfortable feeling.
The embodiment of the invention has the advantages that:
1) The antenna has the advantages of small volume, hard antenna not easy to damage and deform, simple structure, integration on human body, low cost and realization of excellent performance requirements of low frequency band and high frequency band.
2) Resonance is achieved at 2.45GHz and 5.8GHz, and return loss is below-10 dB at the frequency point. Wherein, 2.45GHz is applied to human body detection, and 5.8GHz is applied to in vitro transmission.
Fig. 5 is a radiation pattern of YOZ plane at 2.45GHz of the wearable button antenna provided by the invention, fig. 6 is a radiation pattern of XOY plane at 2.45GHz of the wearable button antenna provided by the invention, as shown in fig. 5 and 6, the radiation pattern of the wearable button antenna at 2.45GHz focuses on a main polarization curve in the pattern, so that the radiation characteristic of the antenna is similar to that of a monopole, the antenna mainly radiates along a direction parallel to a human body, the radiating pattern shows good omnidirectionality at the XOY plane, the maximum gain is about 4.2dBi, the antenna is vertically polarized along the surface of the human body, and the antenna is suitable for body surface communication.
Fig. 7 is a radiation pattern of an XOZ plane at 5.8GHz of the wearable button antenna provided by the invention, and fig. 8 is a radiation pattern of a YOZ plane at 5.8GHz of the wearable button antenna provided by the invention, as shown in fig. 7 and 8, the radiation pattern of the wearable button antenna at 5.8GHz is focused on a main polarization curve in the figure, and it can be seen that the antenna radiates along a direction perpendicular to a human body, and the maximum gain is about 9dBi for in-vitro communication.
Fig. 9 is an S parameter graph of the wearable button antenna provided by the invention in a free space state and under a loaded human tissue model, and as shown in fig. 9, the working bandwidths of the upper and lower frequency bands in the free space in the embodiment of the invention are respectively 2.4-2.6GHz and 5.3-8.4GHz. Since the embodiment of the present invention is applied to the human body, the influence of electromagnetic radiation on the human body is considered, as shown in fig. 9, the return loss of the embodiment of the present invention on the tissue structure of the human body is slightly shifted in the lower frequency band in the free space but the influence is not large, the impedance matching becomes better in the upper frequency band, and the coverage bandwidth range is larger in the free space.
Fig. 10 is a SAR graph of the wearable button antenna provided by the invention for loading a human tissue model at 2.45GHz, and as shown in fig. 10, the SAR value of the embodiment of the invention at 2.45GHz and 5.8GHz is less than 0.6W/kg, so as to meet international standards.
In the description provided above, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features contained in other embodiments, but not others, combinations of features of different embodiments are equally meant to be within the scope of the application and form different embodiments. For example, in the above embodiments, those skilled in the art can use the above embodiments in combination according to known technical solutions and technical problems to be solved by the present application.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution 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-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present invention.
Claims (10)
1. A wearable button antenna, comprising:
The antenna comprises an antenna substrate, wherein one side of the antenna substrate is provided with a radiation patch, the other side of the antenna substrate is provided with a grounding surface, and the radiation patch is electrically connected to the grounding surface;
the body surface fabric is arranged on the body surface of the organism to be detected;
And the rigid coaxial cable is arranged between the ground plane and the body surface fabric and is used for electrically connecting the ground plane to the body surface fabric.
2. The wearable button antenna of claim 1, wherein the radiating patch is connected to the ground plane through a shorting post to form a PIFA antenna structure for generating directional radiation ex vivo;
and/or the ground plane is connected with the body surface fabric through the rigid coaxial cable to form a monopole-like structure for generating horizontal omnidirectional radiation.
3. The wearable button antenna of claim 2, wherein the body surface fabric comprises a conductive fabric and a woven fabric;
The conductive fabric is arranged on one side far away from the body surface of the organism to be detected and is used for being electrically connected with the rigid coaxial cable, and the textile fabric is arranged on one side close to the body surface of the organism to be detected and is used for being in contact with the body surface of the organism to be detected.
4. A wearable button antenna according to claim 2 or 3, characterized in that the frequency band of the in-vitro directional radiation generated by the configured PIFA antenna structure is higher than the frequency band of the horizontal omnidirectional radiation generated by the configured monopole-like structure.
5. A wearable button antenna according to any of claims 1 to 3, wherein the radiating patch is provided with a first notch for adjusting the impedance of the button antenna to assist in matching the impedance of the button antenna with the impedance of the rigid coaxial cable.
6. The wearable button antenna of claim 5, wherein one side of the first slot bottom is provided with an inclined surface.
7. The wearable button antenna of claim 5, wherein the radiating patch is further provided with a second notch, and the second notch is used for extending a current path of a high-frequency band so as to adjust the high-frequency band in which the in-vitro directional radiation generated by the button antenna is located.
8. The wearable button antenna of claim 7, wherein the second notch is provided as a rectangular slot and one side of the rectangular slot opening is provided with a protrusion toward the other side to semi-close the rectangular slot.
9. The wearable button antenna of claim 5, wherein a parasitic patch is further disposed on the antenna substrate on a side on which the radiating patch is disposed, the parasitic patch is not in contact with the radiating patch, and an impedance of the button antenna is adjusted by coupling between the parasitic patch and the radiating patch to assist in matching the impedance of the button antenna with an impedance of the rigid coaxial cable.
10. The wearable button antenna according to claim 9, wherein a protrusion is further arranged on one side of the radiating patch, which is close to the parasitic patch, and is used as a first coupling portion, the parasitic patch is in a U shape, a U-shaped portion is used as a second coupling portion, and the first coupling portion is coupled with the second coupling portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510825175.4A CN120601134A (en) | 2025-06-19 | 2025-06-19 | Wearable button antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510825175.4A CN120601134A (en) | 2025-06-19 | 2025-06-19 | Wearable button antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN120601134A true CN120601134A (en) | 2025-09-05 |
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ID=96900581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510825175.4A Pending CN120601134A (en) | 2025-06-19 | 2025-06-19 | Wearable button antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN120601134A (en) |
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2025
- 2025-06-19 CN CN202510825175.4A patent/CN120601134A/en active Pending
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