GB2541210A - Printed radio frequency sensor structure and a method of preparing a RFID sensor tag - Google Patents
Printed radio frequency sensor structure and a method of preparing a RFID sensor tag Download PDFInfo
- Publication number
- GB2541210A GB2541210A GB1514214.4A GB201514214A GB2541210A GB 2541210 A GB2541210 A GB 2541210A GB 201514214 A GB201514214 A GB 201514214A GB 2541210 A GB2541210 A GB 2541210A
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- antenna
- sensing
- rfid
- conductive
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000011540 sensing material Substances 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000003292 glue Substances 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 229920001940 conductive polymer Polymers 0.000 claims abstract description 4
- 239000004020 conductor Substances 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 229920000642 polymer Polymers 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000002360 explosive Substances 0.000 abstract description 4
- 239000002575 chemical warfare agent Substances 0.000 abstract description 2
- 239000003317 industrial substance Substances 0.000 abstract description 2
- 231100000331 toxic Toxicity 0.000 abstract description 2
- 230000002588 toxic effect Effects 0.000 abstract description 2
- 239000012855 volatile organic compound Substances 0.000 abstract description 2
- 239000011253 protective coating Substances 0.000 abstract 1
- 241000894007 species Species 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0057—Warfare agents or explosives
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/22—Fuels; Explosives
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Theoretical Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
A printed radio frequency sensor structure comprises a substrate, an antenna arranged on the substrate, and a protection layer covering the antenna. Sensing materials may be mixed into the conductive ink/glue used to print the antenna. The method of forming the RFID tag involves drying, curing and compressing the conductive ink and sensing material mixture to form the antenna. An integrated circuit (IC, chip) is bonded to the antenna and a protective coating is applied over the RFID. The conductor in the conductive ink may be a metal, carbon, a conductive polymer or a mixture thereof. The sensing material may be a metal, carbon, a polymer, an organically modified species or a mixture thereof. The RFID tag may be used to detect gasses such as volatile organic compounds, toxic industrial chemicals, explosive gasses or chemical warfare agents. The sensing material may cause changes to the impedance of the antenna when exposed to such gasses.
Description
PRINTED RADIO FREQUENCY SENSOR STRUCTURE AND A METHOD OF PREPARING A RFID SENSOR TAG
FIEUD OF THE INVENTION
The present invention relates to a printed radio frequency sensor structure in which a direct combination of plural sensing materials to different species of interest that lets RF sensor has capability to detect various target species at one RF sensor.
BACKGROUND OF THE INVENTION
Wireless sensors are devices in which sensing electronic transducers are separated from their associated readout/display components. Wireless sensors had been applied in temperature, pressure, and pH value. It also can be found in monitoring of many gases such as volatile organic compounds, toxic industrial chemicals, and chemical warfare agents in relatively interference-free industrial and indoor environments.
However, in these practical gas sensing applications, the available wireless gas sensors are not easy to meet the sensing requirements in complex environments.
To solve the fundamental selectivity and sensitivity issues, a combination of the three key sensor system components such as sensing material, transducer, and signal generation and processing techniques was utilized.
Until now, there are several battery-free passive wireless sensing technologies based on magneto-elastic, thickness shear mode, surface acoustic wave, magnetic acoustic resonance, and resonant LCR (inductor-capacitor-resistor) transducers.
Except for LCR transducers (RFID sensor tags), most of wireless sensing technologies request extra sensor IC circuits. RFID systems have been widely used in many applications ranging from logistics, to goods tracking, access control, automatic identification of animals, and so on.
With reference to FIG. 1, low frequency RFID systems (125-134 kHZ) and high frequency RFID systems (13.56 MHZ) have short transmission ranges from several centimeter up to 1 meter. Ultra-high frequency (UHF) RFID systems (860-960 MHZ) can cover a range up to 10 meters. Microwave frequency RFID systems (2.4 GHZ) cover transmission ranges up to 30 meters. For long distance sensing in security management and control system, only UHF and microwave RFID systems can meet the requirement.
Referring to FIG. 2, methods and systems for integrated interrogation of RFID sensors were disclosed in US Patent No. 8,717,146. To achieve accurate and precise sensing, several calculated spectral parameters, included the frequency position Fp and magnitude Zp of Zre(f) and the resonant FI and anti-resonant F2 frequencies of Zim( f), were measured. When interest gas was adsorbed on surface of RFID sensor, dielectric constant of sensing film will change, which results in a shift on impendence parameters of RFID sensor antenna. According to this mechanism, LCR transducer (RFID sensor tag) becomes a promising wireless sensing technology.
An embodiment of a process for the fabrication of an RFID sensor has been illustrated. They also provided methods and systems for calibration of RFID sensors used in manufacturing and monitoring systems as disclosed in US Patent No. 7,911,345. For example, they proposed a selected sensing material applied onto the RFID antenna that altered its impedance response when interest gas was adsorbed on surface of sensing materials. A complementary sensor resistor and/or capacitor was also attached across an antenna and an IC memory chip to calibrate the sensor impedance response. A sensing material layer directly coated on surface of HF and UHF RFID antenna has been disclosed in US Publication No. 20140095102. In this design, one selected sensing material was coated on one tag, which is limited to only detect one target species by one tag.
For homeland security applications, long distance RFID sensor for detection of explosives is requested. So HF RFID sensor cannot be used in such long distance application.
Due to low vapor pressure of nitro explosive gases, how to improve the sensitivity, selectivity, reading range of present RF sensors is important issue for realizing it on homeland security applications. Requirements of explosive gas sensor contains be extremely sensitive, be highly selective, and be robust & stable.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
SUMMARY OF THE INVENTION
One aspect of the present invention is to provide a printed radio frequency sensor structure in which a direct combination of plural sensing materials to different species of interest that lets RF sensor has capability to detect various target species at one RF sensor.
Further aspect of the present invention is to provide a printed radio frequency sensor structure which has a benefit of high selectivity and sensitivity due to significant change of antenna impedance.
Another aspect of the present invention is to provide a method of preparing a RFID sensor tag which is a simple, energy-saved, and environmentally friendly.
To obtain the above aspects, a printed radio frequency sensor structure provided by the present invention contains: a substrate, a RF antenna arranged on a top surface of the substrate, and a protection layer covering on the RF antenna arranged, wherein plural sensing materials are directly introduced into a RF antenna mixture of the RF antenna, such that a change occurs on not only dielectric a constant of the sensing materials but also a resistance of the RF antenna, when target species are adsorbed on a surface of a sensing antenna.
In addition, a method of preparing a RFID sensor tag provided by the present invention contains steps of: A) . Printing conductive sensing ink/glue on substrate; B) . Drying, curing and compressing the conductive sensing ink/glue to form a conductive antenna mixture with plural sensing materials; C) . Bonding a chip on a RFID sensing antenna to form a RFID sensor tag; and D) . Coating a protection layer on a top of the RFID sensor tag. Here note protection coating can fully, partially or no cover the conductive sensing antenna.
Preferably, the conductive sensing ink/glue consists of two parts: conductive ink/glue and the plural sensing materials.
Preferably, a conductor in the conductive ink/glue is any one of metal, carbon, conductive polymer, and their derived mixtures.
Preferably, the selected sensing material is any one of metal, carbon, polymer, organically modified species, and their derived mixtures.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram of conventional low frequency RFID systems and high frequency RFID systems. FIG. 2 is a diagram of conventional methods and systems for integrated interrogation of RFID sensors disclosed in US Patent No. 8,717,146. FIG. 3 is a side plane view showing the assembly of a printed radio frequency sensor structure according to a preferred embodiment of the present invention. FIG. 4 is a flow chart of a method of preparing a RFID sensor tag according to a preferred embodiment of the present invention. FIG. 5 is SEM image showing surface morphology of a printed RFID antenna sensing mixture with various sensing materials according to a preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to FIG. 3, a printed radio frequency sensor structure according to a preferred embodiment of the present invention comprises: a substrate 11, a RF antenna arranged 12 on a top surface of the substrate 11, and a protection layer 13 covering on the RF antenna arranged 12, wherein plural sensing materials are directly introduced into a RF antenna mixture of the RF antenna 12, such that a change occurs on not only dielectric a constant of the plural sensing materials but also a resistance of the RF antenna 12, when target species are adsorbed on a surface of a sensing antenna. So the printed radio frequency sensor structure of the present invention has a benefit of high selectivity and sensitivity due to significant change of antenna impedance.
Referring to FIG. 4, a method of preparing a RFID sensor tag according to a preferred embodiment of the present invention comprises steps of: A) . Printing conductive sensing ink/glue on substrate; B) . Drying, curing and compressing the conductive sensing ink/glue to form a conductive antenna mixture with plural sensing materials; C) . Bonding a chip on a RFID sensing antenna to form a RFID sensor tag; and D) . Coating a protection layer on a top of the RFID sensor tag. Here note protection coating can fully, partially or no cover the conductive sensing antenna. FIG. 5 is SEM image showing surface morphology of a printed RFID antenna sensing mixture with various sensing materials according to a preferred embodiment of the present invention.
Preferably, the conductive sensing ink/glue consists of two parts: conductive ink/glue and selected sensing materials.
Preferably, a conductor in the conductive ink/glue is any one of metal, carbon, conductive polymer, and their derived mixtures.
Preferably, the selected sensing material is any one of metal, carbon, polymer, organically modified species, and their derived mixtures.
While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. The scope of the claims should not be limited by the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.
Claims (5)
1. A printed radio frequency sensor structure comprising: a substrate, a RF antenna arranged on a top surface of the substrate, and a protection layer covering on the RF antenna arranged, wherein plural sensing materials are directly introduced into a RF antenna mixture of the RF antenna.
2. A method of preparing a RFID sensor tag comprising steps of: A). Printing conductive sensing ink/glue on substrate; B. Drying, curing and compressing the conductive sensing ink/glue to form a conductive antenna mixture with plural sensing materials; C) . Bonding a chip on a RFID sensing antenna to form a RFID sensor tag; and D) . Coating a protection layer on a top of the RFID sensor tag. Here note protection coating can fully, partially or no cover the conductive sensing antenna.
3. The method of preparing the RFID sensor tag as claimed in claim 2, wherein the conductive sensing ink/glue consists of two parts: conductive ink/glue and selected sensing materials.
4. The method of preparing the RFID sensor tag as claimed in claim 2, wherein a conductor in the conductive ink/glue is any one of metal, carbon, conductive polymer, and their derived mixtures.
5. The method of preparing the RFID sensor tag as claimed in claim 2, wherein the selected sensing material is any one of metal, carbon, polymer, organically modified species, and their derived mixtures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1514214.4A GB2541210A (en) | 2015-08-12 | 2015-08-12 | Printed radio frequency sensor structure and a method of preparing a RFID sensor tag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1514214.4A GB2541210A (en) | 2015-08-12 | 2015-08-12 | Printed radio frequency sensor structure and a method of preparing a RFID sensor tag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201514214D0 GB201514214D0 (en) | 2015-09-23 |
| GB2541210A true GB2541210A (en) | 2017-02-15 |
Family
ID=54200571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1514214.4A Withdrawn GB2541210A (en) | 2015-08-12 | 2015-08-12 | Printed radio frequency sensor structure and a method of preparing a RFID sensor tag |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2541210A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007139574A1 (en) * | 2006-05-26 | 2007-12-06 | Ge Healthcare Bio-Sciences Corp. | System and method for monitoring parameters in containers |
| WO2008127429A2 (en) * | 2006-11-21 | 2008-10-23 | Ge Healthcare Bio-Sciences Corp. | Assembling and utilizing rfid sensors in containers |
-
2015
- 2015-08-12 GB GB1514214.4A patent/GB2541210A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007139574A1 (en) * | 2006-05-26 | 2007-12-06 | Ge Healthcare Bio-Sciences Corp. | System and method for monitoring parameters in containers |
| WO2008127429A2 (en) * | 2006-11-21 | 2008-10-23 | Ge Healthcare Bio-Sciences Corp. | Assembling and utilizing rfid sensors in containers |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201514214D0 (en) | 2015-09-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |