CN110838617A - Stress antenna, preparation method and application - Google Patents
Stress antenna, preparation method and application Download PDFInfo
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- CN110838617A CN110838617A CN201911103624.5A CN201911103624A CN110838617A CN 110838617 A CN110838617 A CN 110838617A CN 201911103624 A CN201911103624 A CN 201911103624A CN 110838617 A CN110838617 A CN 110838617A
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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
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
Abstract
The invention belongs to the technical field of antennas in stress detection and communication technologies, and discloses a stress antenna, a preparation method and application, wherein the stress antenna is provided with a planar spiral antenna; the planar spiral antenna is printed on the substrate; the preparation method comprises the following steps: firstly, cleaning the surface of a substrate by absolute ethyl alcohol; secondly, carrying out surface treatment on the substrate; and thirdly, printing a planar spiral antenna on the substrate by adopting a printing technology, and drying and sintering at the temperature of 60 ℃ for 20 minutes. Due to the unique electrical property of the planar spiral antenna on the substrate, the antenna has high sensitivity to the micro stress, and the micro stress change can be monitored in a wireless communication mode, so that the defects of large volume, large gravity and the like of the traditional micro stress monitoring equipment are overcome. The invention has the characteristics of low cost, stable electrical characteristics, miniaturization, lightness, thinness and low energy consumption, and can monitor the micro-stress change of a measured object passively, in real time, accurately and continuously.
Description
Technical Field
The invention belongs to the technical field of antennas in stress detection and communication technologies, and particularly relates to a stress antenna, a preparation method and application.
Background
Currently, the closest prior art: in recent years, a large number of wireless stress sensors sense the physical world and its changes in different environments; the wireless stress sensor has applications in body area networks of medical systems, bridge monitoring, food industry supply chains and other aspects, and the requirements put higher demands on the size, stability and cost of the wireless stress sensor. The traditional stress sensor design uses an alumina ceramic chip or an alumina ceramic tube as a substrate, needs to work under a heating condition, and needs to be integrated into a wireless communication system during wireless signal transmission so as to realize that the whole test system is heavy and has a large volume. With the rapid development of the internet of things, the design of flexible, portable and low-power-consumption antennas is receiving wide attention, which cannot be met by traditional sensors. Therefore, it becomes a very important task to prepare a passive, real-time, and accurate wireless stress sensor for monitoring the measured object.
With the development of electronic printing technology, electronic ink (such as silver ink, graphene ink, copper ink and the like) is well developed, the existing electronic ink has controllable conductivity and very low resistance value, and the conductive ink not only has thin, uniform and smooth printed film layer and excellent performance, but also can save a large amount of materials, so that the preparation of flexible electronic products becomes possible. However, to prepare an excellent antenna with electronic ink, especially to prepare a sensing element for wireless transmission signals, the influence of structural design and preparation process factors of the sensor needs to be overcome. The conductive structure of a common sensor is designed to be an interdigital structure, the structure cannot wirelessly transmit signals, and the repeatability of the sensor cannot be guaranteed by a preparation process.
In summary, the problems of the prior art are as follows:
(1) the conventional stress sensor has poor flexibility, low portability and high power consumption.
(2) The conductive structure of the sensor manufactured by the existing electronic ink cannot transmit signals wirelessly, and the repeatability of the sensing element cannot be ensured by the preparation process.
The difficulty of solving the technical problems is as follows: in order to overcome the manufacturing process factors (photoetching and the like) and the difficulty that the traditional sensor cannot wirelessly transmit signals, a reasonable antenna structure needs to be designed, so that the change of the electrical characteristics of the antenna on a flexible substrate can be well sensed, which is a difficult problem; in addition, it is difficult to make the prepared antenna stable and repeatable.
The significance of solving the technical problems is as follows:
the stress antenna capable of passively, real-timely and accurately monitoring the micro stress is prepared by using the excellent electrical characteristics of the planar spiral antenna on the easily deformable substrate instead of the current situation that the traditional sensor can only be prepared on ceramic plates such as ceramics or alumina ceramic tubes. The invention makes it possible to apply the antenna in human body area networks (electronic skin), flexible electronic products, food industry supply chains and bridge monitoring (nondestructive inspection).
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a stress antenna, a preparation method and application.
The invention is realized in such a way that a stress antenna is provided with:
the spiral structure of the planar spiral antenna not only can miniaturize the stress antenna, but also enables the stress antenna to have higher stress sensitivity, and compared with a common antenna structure, the sensitivity is improved by more than 100 times;
the planar spiral antenna is printed on a substrate.
Further, the planar spiral antenna material is graphene conductive ink, silver conductive ink or copper conductive ink.
Further, the area of the planar spiral antenna is in the square millimeter level, the number of spiral turns is greater than 1 turn, and the frequency of the antenna is higher than 1 GHz.
Furthermore, the substrate material is flexible substrates such as latex, rubber, polytetrafluoroethylene and paper, and when the flexible substrates are stressed, the stressed strain can be efficiently transmitted to the stress antenna, so that the response time and the sensitivity of the stress antenna are improved.
Another objective of the present invention is to provide a method for manufacturing the stressed antenna, wherein the method for manufacturing the stressed antenna comprises the following steps:
firstly, cleaning the surface of a substrate by absolute ethyl alcohol;
secondly, carrying out surface treatment on the substrate;
and thirdly, printing a planar spiral antenna on the substrate by adopting a printing technology, and drying and sintering at the temperature of 60 ℃ for 20 minutes.
Further, the second step performs ion etching treatment for 20 seconds on the surface of the substrate.
Further, the method can be used for preparing a novel materialThe third step specifically includes: printing a planar spiral antenna on a latex substrate by adopting an ink-jet printing technology, wherein the number of turns of the antenna is 3, and the area of the antenna is 4x4mm2The frequency is 2.4 GHz; drying and sintering at 60 ℃ for 20 minutes; the printing was repeated 5 times in accordance with the design pattern.
Another object of the present invention is to provide an application of the stress antenna in a human body area network.
The invention also aims to provide an application of the stress antenna in bridge monitoring.
Another object of the present invention is to provide an application of the stress antenna in the supply chain of the food industry.
The invention also aims to provide an application of the stress antenna in a flexible electronic product.
In summary, the advantages and positive effects of the invention are: the planar spiral antenna is adopted, the spiral structure not only can miniaturize the stress antenna, but also can enable the stress antenna to have higher stress sensitivity, and compared with a common antenna structure, the unique electrical property of the planar spiral antenna on the substrate improves the sensitivity by more than 100 times, so that the antenna has higher sensitivity to micro-stress; the flexible substrate is used in the invention, stress strain can be efficiently transferred to the stress antenna, and compared with the existing stress sensing element, the sensitivity of the stress antenna is improved by more than 100 times, and the response time is shortened by more than 60 times. And the micro-stress change (such as micro-stress generated by human body physiological activity) can be monitored in a wireless communication mode, so that the defects of large volume, large gravity and the like of the traditional micro-stress monitoring equipment (such as micro-stress generated by human body physiological activity) are overcome.
Compared with the prior art, the stress antenna based on the planar helical antenna has the advantages of quick response and recovery characteristics and high sensitivity to micro-stress monitoring under a passive condition. The specific parameters are as follows: the resonance frequency of the antenna is shifted by 19MHz due to the pulse of the human body, and the return loss is changed by 1 dB; the resonance frequency shifts 33MHz due to blinking, and the return loss changes 3 dB; the respiratory resonance frequency shifts by 62MHz, and the return loss changes by 6 dB; the resonance frequency is shifted by 86MHz by sounding, and the return loss is changed by 9 dB; the bending fingers shifted the resonant frequency by 143MHz and the return loss changed by 15 dB. The invention has the advantages of low cost, over 100 cost reduction compared with the prior art, stable electrical characteristics, miniaturization, lightness and thinness and low energy consumption, and can monitor the micro-stress change of the measured object passively, accurately and continuously in real time.
The stress antenna capable of passively, real-timely and accurately monitoring the micro stress is prepared by utilizing the excellent electrical characteristics of the planar spiral antenna on the easily deformable substrate.
Drawings
Fig. 1 is a schematic structural diagram of a stressed antenna provided in an embodiment of the present invention;
in the figure: 1. a planar helical antenna; 2. a substrate.
Fig. 2 is a flowchart of a method for manufacturing a stressed antenna according to an embodiment of the present invention.
Fig. 3 is a test chart of the stress antenna provided by the embodiment of the invention for different writing brush pressures.
Fig. 4 is a diagram illustrating a pulse beat test of a stress antenna for a radial artery of a healthy adult male according to an embodiment of the present invention.
Fig. 5 is a wireless response diagram of a stress antenna provided by an embodiment of the invention to microstress physiological activity in healthy adult males.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a stress antenna, a manufacturing method and an application thereof, and the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the stressed antenna provided by the embodiment of the present invention includes: planar helical antenna 1, substrate 2. The planar helical antenna 1 is printed on a substrate 2.
In the preferred embodiment of the present invention, the material of the planar helical antenna (1) is conductive ink such as graphene, silver, copper, etc.
In the preferred embodiment of the invention, the area of the planar spiral antenna (1) is in the square millimeter level, the number of spiral turns is more than 1 turn, and the frequency of the antenna is more than 1 GHz.
In the preferred embodiment of the invention, the substrate (2) material is latex, rubber, polytetrafluoroethylene, paper and other flexible substrate materials which are easy to deform.
In the preferred embodiment of the invention, the stress antenna of the invention can wirelessly and passively collect the stress change in real time.
As shown in fig. 2, the method for manufacturing a stressed antenna according to an embodiment of the present invention includes the following steps:
s201: cleaning the surface of the substrate by absolute ethyl alcohol;
s202: performing surface treatment on the substrate, for example, performing 20-second ion etching treatment on the surface of the substrate;
s203: the planar spiral antenna is printed on the substrate by a printing technology, and dried and sintered at the temperature of 60 ℃ for 20 minutes.
The technical solution of the present invention is further described below with reference to the accompanying drawings.
The preparation method of the stress antenna provided by the embodiment of the invention specifically comprises the following steps:
firstly, cleaning the surface of a substrate (2) by absolute ethyl alcohol;
secondly, carrying out surface treatment on the substrate, for example, carrying out 20-second ion etching treatment on the surface of the substrate;
thirdly, printing a planar spiral antenna on the latex substrate by adopting an ink-jet printing technology, wherein the number of turns of the antenna is 3, and the area of the antenna is 4x4mm2The frequency is 2.4 GHz; then drying and sintering at the temperature of 60 ℃ for 20 minutes; in order to make the antenna have low resistance, it is necessary to print the antenna repeatedly 5 times according to the design pattern, and the schematic diagram of the structure is shown in fig. 1.
Due to the unique electrical property of the planar spiral antenna (1) on the substrate (2), the antenna has high sensitivity to the micro stress, and can monitor the micro stress change (such as micro stress generated by human body physiological activities) in a wireless communication mode, thereby overcoming the defects of large volume, large gravity and the like of the traditional micro stress (such as micro stress generated by human body physiological activities) monitoring equipment. The invention has the characteristics of low cost, stable electrical characteristics, miniaturization, lightness, thinness and low energy consumption, and can monitor the micro-stress change of a measured object passively, in real time, accurately and continuously.
Compared with the prior art, the invention has the following advantages: the stress antenna based on the planar spiral antenna has the advantages of quick response and recovery characteristics and high sensitivity to micro-stress monitoring under a passive condition. The specific parameters are as follows: when the brush pen horizontally slides on the surface of the sensor, a plurality of fine hairs of a plurality of brush pen points sequentially horizontally slide along the brush pen, and at the moment, the normalized resistance value forms a plurality of wave peak values; when the brush pen leaves the sensor surface, the normalized resistance firstly has a very obvious diminishing process, but the normalized resistance is not completely an initial value, because the bristles of the brush pen are uneven in length, some bristles always leave the sensor surface firstly, some bristles leave the sensor surface later, and the specific data change is as shown in fig. 2. As shown in FIGS. 3 and 4, the response diagram of the antenna of the present invention to the micro stress generated by the physiological activities of healthy adults is shown, the resonance frequency of the antenna is shifted by 19MHz due to the pulse of the human body, and the return loss is changed by 1 dB; the resonance frequency shifts 33MHz due to blinking, and the return loss changes 3 dB; the respiratory resonance frequency shifts by 62MHz, and the return loss changes by 6 dB; the resonance frequency is shifted by 86MHz by sounding, and the return loss is changed by 9 dB; the bending fingers shifted the resonant frequency by 143MHz and the return loss changed by 15 dB.
The antenna of the present invention was fixed to the radial artery of a healthy adult male subject to test pulse beat as shown in fig. 4 (a). Fig. 4(b) is a normalized resistance curve of the normal pulse beat (dotted line) and the pulse beat after exercise (solid line) of the testee within 60 seconds (for more intuitive test results, we select the test results of the time period from 10 seconds to 18 seconds), and each cycle represents one pulse beat. Under normal conditions, the wrist pulse is 66 beats per minute and the pulse after exercise is 92 beats per minute, and the result is completely consistent with the actual physiological activity. It is readily apparent that the pulse amplitude and frequency under both conditions are clearly different, and the post-exercise arterial waveform amplitude is approximately twice the amplitude of the normal pulsation. Normally, a typical perturbed arterial waveform has three distinct peaks, whereas the post-exercise arterial waveform has only two peaks. This may be due to the effect of pressure wave reflections such as changing heart rate/ventricular ejection characteristics, aortic stiffness/PWV or as described in the literature, changes in the myocardial arterial tone. All data were within normal indicators for healthy adults. The above results demonstrate that the antenna of the present invention can determine subtle differences in blood pulses, which suggests its potential for wearable diagnostic devices for real-time monitoring of human health under different conditions.
The invention is prepared by printing a planar spiral antenna 1 capable of wireless communication on a substrate 2 by using a printing technology, the area is in the square millimeter level, and the frequency of the antenna is more than 1 GHz; due to the unique electrical property of the planar spiral antenna 1 on the substrate 2, the antenna has high sensitivity to micro stress, and can monitor micro stress changes (such as micro stress generated by human physiological activities) in a wireless communication mode, thereby overcoming the defects of large volume, large gravity and the like of the traditional micro stress monitoring equipment (such as micro stress generated by human physiological activities). The invention has the characteristics of low cost, stable electrical characteristics, miniaturization, lightness, thinness and low energy consumption, and can monitor the micro-stress change of a measured object passively, in real time, accurately and continuously.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. A stressed antenna, characterized in that it is provided with:
a planar helical antenna;
the planar spiral antenna is printed on a substrate.
2. The patch antenna of claim 1, wherein the planar helical antenna material is graphene conductive ink, silver conductive ink, copper conductive ink.
3. The stressed antenna of claim 1, wherein the planar helical antenna has an area of square millimeter, a number of turns of the helix is greater than 1 turn, and an antenna frequency is above 1 GHz.
4. The antenna of claim 1, wherein the substrate material is a flexible substrate such as latex, rubber, teflon, paper, or the like.
5. A method for preparing the stress antenna according to any one of claims 1 to 4, wherein the method for preparing the stress antenna comprises the following steps:
firstly, cleaning the surface of a substrate by absolute ethyl alcohol;
secondly, carrying out surface treatment on the substrate;
and thirdly, printing a planar spiral antenna on the substrate by adopting a printing technology, and drying and sintering at the temperature of 60 ℃ for 20 minutes.
6. The method of claim 5, wherein the second step is a 20 second ion etching process of the surface of the substrate.
7. The method for manufacturing a stressed antenna according to claim 5, wherein the third step specifically comprises: printing a planar spiral antenna on a latex substrate by adopting an ink-jet printing technology, wherein the number of turns of the antenna is 3, and the area of the antenna is 4x4mm2The frequency is 2.4 GHz; drying and sintering at 60 ℃ for 20 minutes; the printing was repeated 5 times in accordance with the design pattern.
8. Use of a stressed antenna according to any one of claims 1 to 4 in a body area network.
9. Use of a stressed antenna according to any one of claims 1 to 4 in the supply chain of the food industry.
10. Use of the stressed antenna of any one of claims 1-4 in a flexible electronic product.
11. Use of a stressed antenna according to any one of claims 1 to 4 in bridge monitoring.
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| CN201911103624.5A CN110838617A (en) | 2019-11-13 | 2019-11-13 | Stress antenna, preparation method and application |
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| CN201911103624.5A CN110838617A (en) | 2019-11-13 | 2019-11-13 | Stress antenna, preparation method and application |
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2019
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