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WO2011025353A1 - An improved high frequency antenna - Google Patents

An improved high frequency antenna Download PDF

Info

Publication number
WO2011025353A1
WO2011025353A1 PCT/MY2009/000127 MY2009000127W WO2011025353A1 WO 2011025353 A1 WO2011025353 A1 WO 2011025353A1 MY 2009000127 W MY2009000127 W MY 2009000127W WO 2011025353 A1 WO2011025353 A1 WO 2011025353A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
high frequency
rfid
read range
tuning circuit
Prior art date
Application number
PCT/MY2009/000127
Other languages
French (fr)
Other versions
WO2011025353A8 (en
Inventor
Harindar Singh Attar Singh
Rohisyam Abdul Rahman
Azad Johari
Syarulakma Ab Aziz
Noor Azura Ahmad Tarmizi
Sundhar Subramaniam
Khalil Huzairi Ahmad
Original Assignee
Telekom Malaysia Berhad
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telekom Malaysia Berhad filed Critical Telekom Malaysia Berhad
Priority to SG2012003521A priority Critical patent/SG177695A1/en
Priority to AU2009351695A priority patent/AU2009351695B2/en
Priority to PCT/MY2009/000127 priority patent/WO2011025353A1/en
Priority to JP2012526676A priority patent/JP2013503551A/en
Priority to KR1020127005132A priority patent/KR101569161B1/en
Priority to TW099128935A priority patent/TW201133352A/en
Publication of WO2011025353A1 publication Critical patent/WO2011025353A1/en
Publication of WO2011025353A8 publication Critical patent/WO2011025353A8/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • 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
    • 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

Definitions

  • the present invention relates to radio frequencies. More particularly, the present invention relates to an improved antenna having an extended read range for radio frequency identification implementations (RFID).
  • RFID radio frequency identification implementations
  • Radio frequency identification RFID is a technology similar in theory to bar code identification. With RFID, the electromagnetic coupling in the radio frequency portion of electromagnetic spectrum is used to transmit signals.
  • an RFID system consists of an antenna or coil, a transceiver with a decoder and a transponder or RF tag electronically programmed with unique information in it.
  • the antenna emits radio signals to activate the tag and to read and write data to it.
  • Antennas are the conduits between the tag and the transceiver, which controls the system's data acquisition and communication. Antennas are available in a variety of shapes and sizes; they can be built into a door frame to receive tag data from persons or mounted on specially designed walkways in shopping malls.
  • the electromagnetic field produced by an antenna can be constantly present when multiple tags are expected continually.
  • RFID tags come in a wide variety of shapes and sizes. Animal tracking tags, inserted beneath the skin, can be as small as a pencil lead in diameter and one-half inch in length.
  • a high frequency antenna with an extended read range capability by using a tuning circuit capable of setting the operating frequency according to the desired implementation.
  • an antenna with customizable size and shape is achieved by aligning the antenna circuitry to follow the desired read range capability.
  • Figure 1 is a schematic diagram showing implementation of a high frequency antenna according to an embodiment of the invention.
  • Figure 2 is a perspective view of a high frequency antenna according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE DRAWINGS
  • a high frequency antenna of the present invention consists mainly of a tuning circuit 101, an antenna 102, a coaxial cable 103 with variable length, a plastic casing 104, a male BNC connector 105 that is connected to a high frequency reader 106 that acts as an intermediate device to obtain information from the antenna 102 and transmit the information to an application software installed in a computer 107.
  • the connection between the computer and the HF Reader is through RS232.
  • the tuning circuit 101 is used to set the desired frequency for the operations of the RFID.
  • the operating frequency is pivotal to the successful implementation of the present invention as the RF tag will also operate at the same frequency enabling the circuit board or antenna 102 to read information from the RF tag.
  • the present invention operates at a frequency of 13.56 MHz at 50 ohms impedence but is not limited to this frequency. The frequency may be tuned for different implementations.
  • the tuning circuit 101 is connected by circuitry to the loop of the antenna 102 that is made with a copper tape.
  • the antenna 102 is used to activate the RFID tags to read information from RF tags and relay that information using a coaxial cable 103 to an application software via the high frequency reader 106.
  • the application software is able to display information from the RF tag, write information to the RF tag and enable / disable security measures.
  • the antenna 102 used in the present invention comprise of an antenna loop made of copper and other fixed elements such as variable capacitors, resistors and high speed switching diodes.
  • the resonance tuning of the circuit board or antenna 102 of 13.56 MHz is achieved by using mica capacitors approximating to 10OpF.
  • the fixed elements include variable capacitors of which the value ranges from 1OnF to 6OnF; all connected in parallel to allow tuning of the antenna 102.
  • the capacitor legs are modified to allow them to be soldered.
  • a 40K ⁇ , 2 Watt thick film resistor adjusts the Q factor of the antenna 102.
  • the Q factor in general is used to measure the output of an antenna 102.
  • the switching diode is used for switching the frequency bands.
  • the antenna 102 is uniquely shaped to follow the plastic casing 104 thus allowing a larger read radius of up to 30cm from the base.
  • the antenna 102 can be customised to different size and different read radius which is among the novel features of the present invention.
  • Information relay from the antenna 102 to the application software is performed using a coaxial cable 103 that is connected to the tuning circuit 101 and the information will then be passed to the computer 107 through the high frequency reader 106 with the coaxial cable ending with BNC connector 105.
  • Most commercially available computers comes with a female BNC receiver built in the circuit board therefore not requiring any additional hardware cost for the implementation of the present invention.
  • the plastic casing 104 used in the present invention offers the advantage of weight and mobility while still maintaining overall durability and also protects the antenna and tuning circuit
  • a high frequency antenna 201 in a preferred embodiment of the invention is a cubical shape enclosed by a housing 202.
  • a coaxial cable 203 extends out of the housing 202 and connects to the computer (not shown) via the high frequency reader 106.
  • the housing 202 is having, but not limited to, a dimension of 32 cm x 39.5 cm x 3.1 cm.
  • the present invention can be used in a library for tracking of tagged books.
  • the books can be checked out for borrowing and checked in upon return of the books.
  • the antenna will be able to read approximately 30 cm from the base enabling more books to be read at a time. This will depend on the thickness of each book. All scanned books from the antenna will display information of the book and details of the borrower in the application software running on a standard computer.
  • the antenna can also be used to activate or deactivate a surveillance system or Electronic Article Surveillance (EAS) which is an anti-theft feature that is available within the RFID tag.
  • EAS Electronic Article Surveillance
  • EAS systems are used to electronically detect goods with tag that have not been authorised when they are removed from a retailer.
  • this system will be able to detect if a book is leaving the library premises without being checked out first (or the EAS being disabled upon borrowing the book). In an event if the book with enabled EAS is taken out from the library that passes through a gate antenna, an alarm will go off alerting the library personnel that the book is taken out from the library by an unauthorised person or it's taken without being borrowed with authorisation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Support Of Aerials (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

The present invention discloses an antenna having extended read range for radio frequency identification implementations (RFID) using a tuning circuit (101) for setting operating frequency and read range, an antenna (102) which can be customised in shape and size, a coaxial cable (103) connected to the tuning circuit (101) and terminating at a computer using a BNC connector (105), that connects to the computer through a high frequency reader (106), a plastic casing (104) for housing all the components and an application software (107) for reading and displaying information.

Description

AN IMPROVED HIGH FREQUENCY ANTENNA
The present invention relates to radio frequencies. More particularly, the present invention relates to an improved antenna having an extended read range for radio frequency identification implementations (RFID).
BACKGROUND TO THE INVENTION
Radio frequency identification RFID is a technology similar in theory to bar code identification. With RFID, the electromagnetic coupling in the radio frequency portion of electromagnetic spectrum is used to transmit signals. Typically, an RFID system consists of an antenna or coil, a transceiver with a decoder and a transponder or RF tag electronically programmed with unique information in it. The antenna emits radio signals to activate the tag and to read and write data to it. Antennas are the conduits between the tag and the transceiver, which controls the system's data acquisition and communication. Antennas are available in a variety of shapes and sizes; they can be built into a door frame to receive tag data from persons or mounted on specially designed walkways in shopping malls. The electromagnetic field produced by an antenna can be constantly present when multiple tags are expected continually. RFID tags come in a wide variety of shapes and sizes. Animal tracking tags, inserted beneath the skin, can be as small as a pencil lead in diameter and one-half inch in length.
The significant advantage of all types of RFID systems is the non-contact, non-line-of- sight nature of the technology. Tags can be read through a variety of substances such as snow, fog, ice, paint, and other visually and environmentally challenging conditions, where barcodes or other optically read technologies would be useless. The read/write capability of an active RFID system is also a significant advantage in interactive applications such as inventory or maintenance tracking. Though it is a costlier technology (compared with barcode), RFID has become indispensable for a wide range of automated data collection and identification applications that would not be possible otherwise. However, commercially available RFID systems come with a limited read range characteristics and fixed antenna size. This type of implementation limits the usage of the RFID and therefore does not maximize the potential of the technology. It is highly desirable to provide an RFID implementation having an improved read range characteristics and a customizable antenna size structure to address these shortcomings.
SUMMARY OF THE INVENTION
It is a first object of the present invention to provide a high frequency antenna with extended read range capability.
It is a second object of the present invention to provide an antenna which can be customised in size and shape. According to the first aspect of the present invention, there is provided a high frequency antenna with an extended read range capability by using a tuning circuit capable of setting the operating frequency according to the desired implementation.
In yet another aspect of the present invention, an antenna with customizable size and shape is achieved by aligning the antenna circuitry to follow the desired read range capability.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described in greater detail, with reference to the accompanying drawing, in which:
Figure 1 is a schematic diagram showing implementation of a high frequency antenna according to an embodiment of the invention; and
Figure 2 is a perspective view of a high frequency antenna according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE DRAWINGS
Referring to Figure 1, a high frequency antenna of the present invention consists mainly of a tuning circuit 101, an antenna 102, a coaxial cable 103 with variable length, a plastic casing 104, a male BNC connector 105 that is connected to a high frequency reader 106 that acts as an intermediate device to obtain information from the antenna 102 and transmit the information to an application software installed in a computer 107. The connection between the computer and the HF Reader is through RS232.
The tuning circuit 101 is used to set the desired frequency for the operations of the RFID. The operating frequency is pivotal to the successful implementation of the present invention as the RF tag will also operate at the same frequency enabling the circuit board or antenna 102 to read information from the RF tag. The present invention operates at a frequency of 13.56 MHz at 50 ohms impedence but is not limited to this frequency. The frequency may be tuned for different implementations.
Still referring to Figure 1, the tuning circuit 101 is connected by circuitry to the loop of the antenna 102 that is made with a copper tape. The antenna 102 is used to activate the RFID tags to read information from RF tags and relay that information using a coaxial cable 103 to an application software via the high frequency reader 106. The application software is able to display information from the RF tag, write information to the RF tag and enable / disable security measures. The antenna 102 used in the present invention comprise of an antenna loop made of copper and other fixed elements such as variable capacitors, resistors and high speed switching diodes.
The resonance tuning of the circuit board or antenna 102 of 13.56 MHz is achieved by using mica capacitors approximating to 10OpF. The fixed elements include variable capacitors of which the value ranges from 1OnF to 6OnF; all connected in parallel to allow tuning of the antenna 102. The capacitor legs are modified to allow them to be soldered. A 40KΩ, 2 Watt thick film resistor, adjusts the Q factor of the antenna 102. The Q factor in general is used to measure the output of an antenna 102. The switching diode is used for switching the frequency bands.
The antenna 102 is uniquely shaped to follow the plastic casing 104 thus allowing a larger read radius of up to 30cm from the base. The antenna 102 can be customised to different size and different read radius which is among the novel features of the present invention.
Information relay from the antenna 102 to the application software is performed using a coaxial cable 103 that is connected to the tuning circuit 101 and the information will then be passed to the computer 107 through the high frequency reader 106 with the coaxial cable ending with BNC connector 105. Most commercially available computers comes with a female BNC receiver built in the circuit board therefore not requiring any additional hardware cost for the implementation of the present invention. In addition, the plastic casing 104 used in the present invention offers the advantage of weight and mobility while still maintaining overall durability and also protects the antenna and tuning circuit
Referring to Figure 2, a high frequency antenna 201 in a preferred embodiment of the invention is a cubical shape enclosed by a housing 202. A coaxial cable 203 extends out of the housing 202 and connects to the computer (not shown) via the high frequency reader 106. Preferably, the housing 202 is having, but not limited to, a dimension of 32 cm x 39.5 cm x 3.1 cm. The present invention will now be described by way of an example
EXAMPLE In a preferred embodiment, the present invention can be used in a library for tracking of tagged books. The books can be checked out for borrowing and checked in upon return of the books. The antenna will be able to read approximately 30 cm from the base enabling more books to be read at a time. This will depend on the thickness of each book. All scanned books from the antenna will display information of the book and details of the borrower in the application software running on a standard computer. The antenna can also be used to activate or deactivate a surveillance system or Electronic Article Surveillance (EAS) which is an anti-theft feature that is available within the RFID tag. Typically, EAS systems are used to electronically detect goods with tag that have not been authorised when they are removed from a retailer. For this application, this system will be able to detect if a book is leaving the library premises without being checked out first (or the EAS being disabled upon borrowing the book). In an event if the book with enabled EAS is taken out from the library that passes through a gate antenna, an alarm will go off alerting the library personnel that the book is taken out from the library by an unauthorised person or it's taken without being borrowed with authorisation.

Claims

WHAT IS CLAIMED IS:
1. An antenna having extended read range for radio frequency identification implementations (RFID), wherein the antenna comprising a tuning circuit (101) for setting an operating frequency and read range, an antenna (102) which can be customised in size and aligned by circuitry to follow the desired read range capability, a coaxial cable (103) having a first end connected to the tuning circuit (101) and a second end connected to a computer (107) by way of a connector (105) that is connected to a high frequency reader (106), a housing (104) and an application software for reading and displaying information.
PCT/MY2009/000127 2009-08-28 2009-08-28 An improved high frequency antenna WO2011025353A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SG2012003521A SG177695A1 (en) 2009-08-28 2009-08-28 An improved high frequency antenna
AU2009351695A AU2009351695B2 (en) 2009-08-28 2009-08-28 An improved high frequency antenna
PCT/MY2009/000127 WO2011025353A1 (en) 2009-08-28 2009-08-28 An improved high frequency antenna
JP2012526676A JP2013503551A (en) 2009-08-28 2009-08-28 Improved high frequency antenna
KR1020127005132A KR101569161B1 (en) 2009-08-28 2009-08-28 An improved high frequency antenna
TW099128935A TW201133352A (en) 2009-08-28 2010-08-27 An improved high frequency antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/MY2009/000127 WO2011025353A1 (en) 2009-08-28 2009-08-28 An improved high frequency antenna

Publications (2)

Publication Number Publication Date
WO2011025353A1 true WO2011025353A1 (en) 2011-03-03
WO2011025353A8 WO2011025353A8 (en) 2011-10-13

Family

ID=41202784

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2009/000127 WO2011025353A1 (en) 2009-08-28 2009-08-28 An improved high frequency antenna

Country Status (6)

Country Link
JP (1) JP2013503551A (en)
KR (1) KR101569161B1 (en)
AU (1) AU2009351695B2 (en)
SG (1) SG177695A1 (en)
TW (1) TW201133352A (en)
WO (1) WO2011025353A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240039581A1 (en) * 2020-03-06 2024-02-01 Avid Identification Systems, Inc. Variable-q antenna coil circuit for rfid applications

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI554268B (en) * 2014-08-13 2016-10-21 研華股份有限公司 Electronic medicine containing device, system for dispensing medicines and method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8814993U1 (en) * 1988-01-04 1989-03-02 Oppermann, Richard, 7762 Ludwigshafen Antenna unit consisting of antenna loop, capacitor and coupling
GB2433385A (en) * 2005-12-14 2007-06-20 Matsushita Electric Ind Co Ltd RF tag reader capable of communicating with a plurality of tags

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2004124049A (en) * 2002-01-09 2005-03-27 Мидвествако Корпорейшн (Us) INTELLIGENT STATION WITH A SET OF RADIO FREQUENCY ANTENNAS, SYSTEM AND METHOD OF INVENTORY CONTROL WITH ITS USE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8814993U1 (en) * 1988-01-04 1989-03-02 Oppermann, Richard, 7762 Ludwigshafen Antenna unit consisting of antenna loop, capacitor and coupling
GB2433385A (en) * 2005-12-14 2007-06-20 Matsushita Electric Ind Co Ltd RF tag reader capable of communicating with a plurality of tags

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240039581A1 (en) * 2020-03-06 2024-02-01 Avid Identification Systems, Inc. Variable-q antenna coil circuit for rfid applications

Also Published As

Publication number Publication date
JP2013503551A (en) 2013-01-31
AU2009351695B2 (en) 2013-10-24
SG177695A1 (en) 2012-02-28
TW201133352A (en) 2011-10-01
WO2011025353A8 (en) 2011-10-13
KR20120058529A (en) 2012-06-07
AU2009351695A1 (en) 2012-02-02
KR101569161B1 (en) 2015-11-13

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