EP3069410A1 - Microwave antenna with integrated function of organic vapor sensor - Google Patents
Microwave antenna with integrated function of organic vapor sensorInfo
- Publication number
- EP3069410A1 EP3069410A1 EP14818860.0A EP14818860A EP3069410A1 EP 3069410 A1 EP3069410 A1 EP 3069410A1 EP 14818860 A EP14818860 A EP 14818860A EP 3069410 A1 EP3069410 A1 EP 3069410A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- functional layer
- organic vapors
- microwave antenna
- integrated sensor
- 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.)
- Granted
Links
Classifications
-
- 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
Definitions
- the introduced invention is a microwave antenna with an integrated sensor for organic vapors, namely a microstrip antenna with a ground plane intended for information transmission over wireless networks and with an additional function for organic vapor detection.
- microstrip antennas of various structure designs are used. From the perspective of material there exist several kinds of microstrip antennas. For instance, they can consist of thin cupreous, silver or other metal small surfaces, or layers of these metals that are applied to an electrically nonconductive substrate (dielectric). These small surfaces are constructionally adjusted microstrips intended for specific frequencies. Most commonly, the ground plane is located on the back section of the microstrip antenna. The surface structure of such antennas is solid, which makes them incapable of responding to changes of vapors present in the surroundings and therefore, they cannot be used both for signal transmission and organic vapors detection.
- the antennas based on carbon nanotube layers or parts are widely used in practice.
- the antenna as claimed by the Korean patent application KR20090105991 is made of a polymer composite that contains carbon nanotubes in a polymer matrix on the basis of polyamide (nylon).
- conductive material for the antenna in the Japanese patent application JP2002109489 is a composite-based conductive paste containing carbon nanotubes, conductive metal powder and a polymer matrix.
- the patent application USA 2005116861 relates to a smaller antenna with a radiator formed by carbon nanotubes which has excellent performance characteristics in the high- frequency band.
- the subject of the patent application USA 2011220722 is an RFID tag antenna consisting of a substrate with a pattern layer formed by interconnected segments of carbon nanotubes.
- the layer of carbon nanotubes is applied to the surface of the solar panel the function of which is, in this case, detection of photons.
- the combination of several functions is based on combinations of individual functions of two structural parts of the product. Up to now, insufficient attention has been paid to the possible multiple functions of the actual layer of carbon nanotubes.
- the microwave antenna with the integrated sensor of organic vapors.
- the basis of this invention resides in the fact that the antenna is formed by the plane shape electrically non-conductive substrate the surface of which is coated with an electrically conductive layer capable of receiving / transmitting the signal and also reversible adsorption / desorption of molecules of organic vapors based on randomly entangled nanotubes.
- This functional layer is a product of the vacuum filtration of the dispersion of carbon nanotubes through a filtering membrane of polymeric nanofibers, which can be either a self-supporting functional layer, or it can have an integrated filtering membrane forming a part of the resulting functional layer.
- the diameter of the nanotubes in the functional layer is 10 - 30 nm and the length 1 - 10 ⁇ ; the depth of the functional layer is 30 - 500 ⁇ .
- treatment by oxidation can increase the sensitivity of the layer.
- the microwave antenna with the integrated sensor for organic vapors has the form of a planar or planar biconical dipole. Also, it can be miniaturized as in the case of the PIFA antenna. The shape and size of the antenna can be adjusted according to the required frequency.
- antennas capable of operating in the microwave band and detecting organic vapors based on the change in resistance of the layer applied to a substrate used for high frequency technology have not been described.
- the nanotubes it is possible to design such an antenna that does not affect it matching greatly when detecting organic vapors. Therefore, such a solution is regarded as innovative as it allows multiple functions of a small antenna incorporated in a mobile device, which includes signal transmission and detection of organic vapors. In terms of design, this is an unused production technology of the substrate for microstrip antennas.
- the antenna can then detect organic vapors in the air and on evaluating the data it notifies its user that some type of organic vapors is present in the air; in most cases these vapors are hamful even in small concentrations.
- the antenna does not perform the actual evaluation. In this case, the antenna is perceived as part of a chain in which it operates as the passive antenna and at the same time as the sensor of organic vapors.
- fig. 2 Illustrative diagram of the antenna / sensor of organic vapors - cross-sectional view; fig. 3 - Circuit diagram of the antenna / sensor of organic vapors in the evaluation chain.
- the microstrip antenna in the exemplary implementation (see fig. 1 and 2), is formed by a functional layer 2 consisting of randomly entangled carbon nanotubes (MWCNT) with the length of 1 - 10 ⁇ and diameter in the range of 10 - 30 nm.
- the functional layer 2 is deposited on an electrically nonconductive substrate 1 made of PMMA.
- the substrate 1 consists of a strip with the length of 45 mm and width 9 mm, which is anchored in the ground plane 4 formed by the printed circuit board.
- the depth of the functional layer 2 is 200 ⁇ and is connected by a coaxial line 3.
- the antenna can be integrated into the case of a portable device that uses wireless transmission of information.
- the functional layer is produced by means of vacuum filtration through a polymer membrane of an aqueous dispersion composed of carbon nanotubes and a mixture of surfactants.
- the polymer filtration membrane composed of polyurethane nanofibers is produced by means of electrostatically spinning of a solution of polyurethane in dimethylformamide. Such amount of dispersion that corresponds to the depth of 200 ⁇ is filtered through this membrane. Upon reaching this depth the resulting layer is washed by alcohol and water in order to remove residues of surfactants. The filtration membrane is then removed and the filtered layer is dried between filter papers.
- the layer After drying the layer is formed into a suitable shape, which corresponds to the requirements of the frequency of the antenna; in this particular case it is a strip with dimensions of 9 x 45 mm.
- the strip is then applied to the PMMA substrate. This strip is best adapted to the frequency of 1.28 GHz.
- the functional layer 2 is used as self-supporting (the filtration nanofibrous membrane is separated).
- the layer is electrically conductive and able to receive / transmit signal. Moreover, it is capable of adsorption of molecules of organic vapors when exposed to these vapors. This process is reversible; the removal of the layer leads to desorption of molecules of organic vapors. Adsorption and desorption of vapors can be easily detected by measuring the changes in DC resistance. It is also possible to employ scalar measuring of a reflection coefficient of the antenna or to measure changes in its resonant frequency, or possibly to detect changes in resonant frequency of the antenna.
- the structural design of the antenna is similar to Example 1.
- the functional layer is produced by means of vacuum filtration of an aqueous dispersion composed of carbon nanotubes and mixture of surfactants.
- the filtration polymer membrane composed of polystyrene or polyamide 6 is produced by means of electrostatically spirming of the solution.
- the dispersion is filtered through this membrane.
- Such amount of dispersion that corresponds to the depth of 30 ⁇ of the functional layer 2 is filtered through this membrane.
- the resulting layer is washed by alcohol and water in order to remove residues of surfactants.
- the filtration membrane is a part of the newly emerged structure and it is dried between filtration papers. After drying the layer is formed into an adequate shape, for instance triangle, square or others, in order to comply with the requirements of the frequency.
- the resulting formation is then connected to a non-conductive substrate L
- the size and shape is always dependent on a specific frequency for impedance matching of the antenna.
- the antenna can be easily implemented in unlicensed ISM bands, such as 2.45 GHz or 5.8 GHz; it is also possible to produce and operate the antenna in lower frequency bands. Also, the antenna can be miniaturized as in the case of the PIFA type.
- Example 1 The design of the said antenna and its production correspond to Example 1 or 2. Nevertheless, in the exemplary implementation the functional layer 2 of carbon nanotubes is consequently functionalized by oxidation in order to increase sensitivity.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CZ2013-863A CZ2013863A3 (en) | 2013-11-08 | 2013-11-08 | Microwave antenna with integrated function of sensor of organic vapors |
PCT/CZ2014/000130 WO2015067229A1 (en) | 2013-11-08 | 2014-11-07 | Microwave antenna with integrated function of organic vapor sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3069410A1 true EP3069410A1 (en) | 2016-09-21 |
EP3069410B1 EP3069410B1 (en) | 2020-09-23 |
Family
ID=51989664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14818860.0A Active EP3069410B1 (en) | 2013-11-08 | 2014-11-07 | Method of manufacturing a microwave antenna with integrated function of organic vapor sensor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3069410B1 (en) |
CZ (1) | CZ2013863A3 (en) |
WO (1) | WO2015067229A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018116141B3 (en) | 2018-07-04 | 2019-12-05 | Technische Universität Chemnitz | Method and sensor for load detection and method for its production |
CN112909510B (en) * | 2021-01-27 | 2022-11-25 | 宇联星程(浙江)科技有限公司 | Carbon fiber silver-plated conductive carbon fiber composite material antenna |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4785012B2 (en) | 2000-09-29 | 2011-10-05 | トッパン・フォームズ株式会社 | Method of forming antenna for non-contact type data transmitter / receiver and non-contact type data transmitter / receiver |
JP2003298338A (en) | 2002-04-02 | 2003-10-17 | Fuji Xerox Co Ltd | Antenna and communication device |
US6997039B2 (en) * | 2004-02-24 | 2006-02-14 | Clemson University | Carbon nanotube based resonant-circuit sensor |
KR100987611B1 (en) | 2008-04-04 | 2010-10-13 | 주식회사 에이스테크놀로지 | Carbon nanotube antenna |
TWI504059B (en) | 2010-03-12 | 2015-10-11 | Hon Hai Prec Ind Co Ltd | Rfid tag antenna and method for making same |
DE102010021977B4 (en) * | 2010-05-28 | 2020-01-16 | Dräger Safety AG & Co. KGaA | Electrochemical gas sensor and use of an electrochemical gas sensor for the detection of ozone or nitrogen dioxide |
CN102985815B (en) * | 2010-07-09 | 2017-03-15 | 英派尔科技开发有限公司 | Resonator gas sensor using nanotube |
CN102646734A (en) | 2011-02-21 | 2012-08-22 | 中兴通讯股份有限公司 | Antenna device and mobile terminal |
US9276305B2 (en) * | 2012-05-02 | 2016-03-01 | The United States Of America As Represented By The Secretary Of The Army | Method and apparatus for providing a multifunction sensor using mesh nanotube material |
-
2013
- 2013-11-08 CZ CZ2013-863A patent/CZ2013863A3/en not_active IP Right Cessation
-
2014
- 2014-11-07 WO PCT/CZ2014/000130 patent/WO2015067229A1/en active Application Filing
- 2014-11-07 EP EP14818860.0A patent/EP3069410B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
CZ304850B6 (en) | 2014-12-03 |
CZ2013863A3 (en) | 2014-12-03 |
WO2015067229A1 (en) | 2015-05-14 |
EP3069410B1 (en) | 2020-09-23 |
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