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)
• Support Of Aerials (AREA)
• Variable-Direction Aerials And Aerial Arrays (AREA)
• Near-Field Transmission Systems (AREA)

Priority Applications (6)

Applications Claiming Priority (1)

Publications (2)

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Family Applications (1)

Country Status (6)

Cited By (1)

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Citations (2)

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• 2009
  • 2009-08-28 JP JP2012526676A patent/JP2013503551A/ja active Pending
  • 2009-08-28 WO PCT/MY2009/000127 patent/WO2011025353A1/en active Application Filing
  • 2009-08-28 KR KR1020127005132A patent/KR101569161B1/ko active IP Right Grant
  • 2009-08-28 SG SG2012003521A patent/SG177695A1/en unknown
  • 2009-08-28 AU AU2009351695A patent/AU2009351695B2/en not_active Ceased
• 2010
  • 2010-08-27 TW TW099128935A patent/TW201133352A/zh unknown

Patent Citations (2)

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