SE543434C2 - A UHF RFID tag - Google Patents

A UHF RFID tag

Info

Publication number
SE543434C2
SE543434C2 SE1950795A SE1950795A SE543434C2 SE 543434 C2 SE543434 C2 SE 543434C2 SE 1950795 A SE1950795 A SE 1950795A SE 1950795 A SE1950795 A SE 1950795A SE 543434 C2 SE543434 C2 SE 543434C2
Authority
SE
Sweden
Prior art keywords
loop
inductor
tag
dipole antenna
parasitic
Prior art date
Application number
SE1950795A
Other languages
Swedish (sv)
Other versions
SE1950795A1 (en
Inventor
Antti Leskela
Lauri Huhtasalo
Original Assignee
Stora Enso Oyj
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 Stora Enso Oyj filed Critical Stora Enso Oyj
Priority to SE1950795A priority Critical patent/SE543434C2/en
Priority to FI20225051A priority patent/FI130267B/en
Priority to PCT/IB2020/056010 priority patent/WO2020261168A1/en
Publication of SE1950795A1 publication Critical patent/SE1950795A1/en
Publication of SE543434C2 publication Critical patent/SE543434C2/en

Links

Classifications

    • 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
    • G06K19/0775—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 arrangements for connecting the integrated circuit to the antenna
    • G06K19/07752—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 arrangements for connecting the integrated circuit to the antenna using an interposer
    • 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
    • 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
    • G06K19/02—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the selection of materials, e.g. to avoid wear during transport through the machine
    • G06K19/025—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the selection of materials, e.g. to avoid wear during transport through the machine the material being flexible or adapted for folding, e.g. paper or paper-like materials used in luggage labels, identification tags, forms or identification documents carrying RFIDs
    • 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
    • G06K19/0723—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 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • 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
    • 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
    • G06K19/0775—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 arrangements for connecting the integrated circuit to the antenna
    • G06K19/07754—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 arrangements for connecting the integrated circuit to the antenna the connection being galvanic
    • 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
    • G06K19/0775—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 arrangements for connecting the integrated circuit to the antenna
    • G06K19/07756—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 arrangements for connecting the integrated circuit to the antenna the connection being non-galvanic, e.g. capacitive
    • 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
    • G06K19/07786—Antenna details the antenna being of the HF type, such as a dipole
    • 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
    • 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
    • H01Q1/2225—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 active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole

Abstract

The present invention relates to an UHF RFID tag on a substrate (6), which tag comprising dipole antenna (1), an inductor feed loop (2), a tag chip (3) that is galvanically connected to the inductor feed loop and a coupling section (4) that connects the inductor feed loop to the dipole antenna, wherein the tag further comprising a parasitic inductor loop (5), in parallel with the inductor feed loop, wherein the parasitic inductor loop is not galvanically connected to the tag chip or the inductor feed loop or the dipole antenna.

Description

lO A UHF RFID TAG Technical field The present invention relates to an UHF RFID tag on asubstrate, which tag comprising dipole antenna, aninductor feed loop, a tag chip that is galvanicallyconnected to the inductor feed loop and a couplingsection that connects the inductor feed loop to the dipole antenna.
In the following the expression RFID (Radio FrequencyIdentification) tag will be frequently used. An RFID tagis a tag that is intended to be attached onto objects tobe identified in a radio-frequency identification system.An RFID tag comprising an RFID antenna and an RFID IC(integrated circuit or microchip), which IC is electrically connected onto the antenna.
The RFID in this context is a UHF antenna and operates in the frequency range 860-960 MHz.
Background - Problem The most widely used antenna for RFID tags operates inthe UHF band and is a half-wave dipole antenna.Typically, the tag consists of four main components, withreference to Figure l: Dipole antenna (A), couplingsection (B), inductor loop (C) and tag chip or IC(lO4).The inductor loop together with the coupling sectionmatch the impedance of the dipole antenna (~70§D to theimpedance of tag chip (parallel resistance ~l.2 kfl andcapacitance (C) ~l-l.5 pF). The inductance (L) of inductor (feed) loop and capacitance (C) of tag chip set lO the resonance frequency of the dipole tag antenna where power transfer is maximum.
The dipole tag antenna resonance frequency isproportional to l/VLC, which means that if thecapacitance (C) increases the inductance (L) mustdecrease to maintain the same resonance frequency. Theinductance (L) of inductor loop is proportional to thelength of the inductor loop. If the capacitance increasesthe inductor loop must be physically shorter to maintainthe same resonance frequency. The problem is thatphysically shorter loop is found less efficient in powertransfer between dipole antenna and tag chip. It istypical that especially older generation or low end tagchips have high capacitance and low sensitivity whichmakes the design of high performing dipole tag antenna difficult.
Object of invention An object with the invention is to provide an improved RFID tag that solves the above-mentioned problems.
Summary of the invention In accordance of the invention, the RFID tag ischaracterized in that the tag further comprising aparasitic inductor loop, in parallel with the inductorfeed loop, wherein the parasitic inductor loop is notgalvanically connected to the tag chip or the inductor feed loop or the dipole antenna.
Detailed description of the invention lO The invention will now be described more with reference to figures 2-6: Figure 2 discloses an RFID tag in accordance with the invention, which comprising a parasitic inductor loop 5.
Figure 3 discloses current distribution of the dipole tag antenna l with and without the parasitic inductor loop 5.
Figure 4 discloses radiation and total efficiency of thedipole tag antenna with and without the parasitic inductor loop.
Figure 5 discloses antenna Gain of the dipole antenna tag with and without the parasitic inductor loop.
Figure 6a, 6b and 6c disclose three different embodimentsof the arrangement of the parasitic inductor loop relative the inductor feed loop on a substrate.
Figures 2 and 6a-c disclose the inventive UHF RFID tag ona substrate 6. The RFID tag comprising a dipole antennal, an inductor feed loop 2, a tag chip 3 that isgalvanically connected to the inductor feed loop 2 and acoupling section 4 that connects the inductor feed loop to the dipole antenna.
The inventive UHF RFID tag further comprising acontinuous parasitic inductor loop 5, in parallel withthe inductor feed loop, wherein the parasitic inductorloop is not galvanically connected to the tag chip or the inductor feed loop or the dipole antenna. lO In tests this antenna solution has been proven toincrease the power transfer between the dipole antenna and tag chip.
Figure 3 discloses the current distribution of the dipoletag antenna with parasitic inductor loop (right side) andwithout parasitic inductor loop (left side). Part of theRF signal is coupled to parasitic inductor loop whichenhance the power transfer between the dipole antenna andthe tag chip, which can be seen by comparing the dipoleantenna to the right with the dipole antenna to theright.
Figure 4 discloses the dipole tag antenna radiation- andtotal efficiency with parasitic inductor loop and withoutparasitic inductor loop in decibels [dB]. The radiationefficiency of the dipole antenna tag with parasiticinductor loop is up to 2.5 dB higher that the same tag without the parasitic inductor loop.
Graph 10 discloses Radiation Efficiency [dB] without parasitic inductor loop.
Graph ll discloses Radiation Efficiency [dB] with parasitic inductor loop.
Graph l2 discloses Total Efficiency [dB] without parasitic inductor loop.
Graph l3 discloses Total Efficiency [dB] with parasitic inductor loop. lO Figure 5 discloses the dipole tag antenna maximum Gain[dBi] with and without parasitic inductor loop. Theantenna maximum Gain of the dipole antenna tag withparasitic inductor loop is higher than the Gain of the same tag without the parasitic inductor loop.
Graph l4 discloses antenna Gain [dBi] without parasitic inductor loop.
Graph l5 discloses antenna Gain [dBi] with parasitic inductor loop.
The parasitic inductor loop 5 arrangement may be arrangedin different ways on the substrate relative to theinductor feed loop. Figures 6a, 6b and 6c disclose three different embodiments within the scope of the invention.
Figure 6a discloses a first embodiment of the invention,wherein the parasitic inductor loop 5 is located on thesame side of the substrate as the inductor feed loop 2 and the dipole antenna.
Figure 6b discloses a second embodiment of the invention,wherein the parasitic inductor loop 5 is located on theopposite side of the substrate as the inductor feed loop 2 and the dipole antenna.
Figure 6b discloses a third embodiment of the invention,wherein the parasitic inductor loop 5 is located on theopposite side of the substrate as the inductor feed loop2 and the dipole antenna and wherein the loops 2, 5 at least partly overlapping each other. lO A benefit with the invention is that inventive antennadesign improves the performance of UHF RFID tags byadding a parasitic inductor loop close to feed area. RFIDproduct development is often chase of best performance,so this idea has real-life use cases for example in retail area.
The substrate is preferably made of paper or cardboardHowever, a skilled person realizes that other non- conductive materials are possible such as plastic.
In the foregoing, the invention has been described onbasis of some specific embodiments. However, a personskilled in the art realizes that other embodiments andvariants are possible within the scope of the following claims.

Claims (5)

lO C L A I M S
1. I. An UHF RFID tag on a substrate (6), which tagcomprising dipole antenna (l), an inductor feed loop (2),a tag chip (3) that is galvanically connected to theinductor feed loop and a coupling section (4) thatconnects the inductor feed loop to the dipole antenna,characterized in that the tag further comprising aparasitic inductor loop (5), in parallel with theinductor feed loop, wherein the parasitic inductor loopis not galvanically connected to the tag chip or the inductor feed loop or the dipole antenna.
2. UHF RFID tag according to claim l, characterized inthat the parasitic inductor loop is located at the sameside of the substrate as the inductor feed loop and the dipole antenna.
3. UHF RFID tag according to claim l, characterized inthat the parasitic inductor loop is located at theopposite side of the substrate as the inductor feed loop and the dipole antenna.
4. UHF RFID tag according to claim 3, characterized inthat the parasitic inductor loop on a first side of thesubstrate and the inductor feed loop on an oppositesecond side of the substrate at least partly overlapping each other.
5. UHF RFID tag according to any of claims l-4,characterized in that the substrate is made of paper or cardboard.
SE1950795A 2019-06-26 2019-06-26 A UHF RFID tag SE543434C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE1950795A SE543434C2 (en) 2019-06-26 2019-06-26 A UHF RFID tag
FI20225051A FI130267B (en) 2019-06-26 2020-06-25 A uhf rfid tag
PCT/IB2020/056010 WO2020261168A1 (en) 2019-06-26 2020-06-25 A uhf rfid tag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1950795A SE543434C2 (en) 2019-06-26 2019-06-26 A UHF RFID tag

Publications (2)

Publication Number Publication Date
SE1950795A1 SE1950795A1 (en) 2020-12-27
SE543434C2 true SE543434C2 (en) 2021-02-16

Family

ID=74060183

Family Applications (1)

Application Number Title Priority Date Filing Date
SE1950795A SE543434C2 (en) 2019-06-26 2019-06-26 A UHF RFID tag

Country Status (3)

Country Link
FI (1) FI130267B (en)
SE (1) SE543434C2 (en)
WO (1) WO2020261168A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070052613A1 (en) * 2005-09-06 2007-03-08 Sebastian Gallschuetz Radio frequency identification transponder antenna
US20090278687A1 (en) * 2007-04-06 2009-11-12 Murata Manufacturing Co., Ltd. Wireless ic device
EP2169767A1 (en) * 2007-07-18 2010-03-31 Fujitsu Limited Wireless tag and manufacturing method of the wireless tag
US20120273577A1 (en) * 2011-04-29 2012-11-01 Samsung Techwin Co., Ltd. Rfid tag having enhanced durability
US20130002403A1 (en) * 2011-06-30 2013-01-03 Qualcomm Incorporated Rfid system with improved coverage and increased reading distance
WO2019097106A1 (en) * 2017-11-16 2019-05-23 Confidex Oy Rfid transponder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070052613A1 (en) * 2005-09-06 2007-03-08 Sebastian Gallschuetz Radio frequency identification transponder antenna
US20090278687A1 (en) * 2007-04-06 2009-11-12 Murata Manufacturing Co., Ltd. Wireless ic device
EP2169767A1 (en) * 2007-07-18 2010-03-31 Fujitsu Limited Wireless tag and manufacturing method of the wireless tag
US20120273577A1 (en) * 2011-04-29 2012-11-01 Samsung Techwin Co., Ltd. Rfid tag having enhanced durability
US20130002403A1 (en) * 2011-06-30 2013-01-03 Qualcomm Incorporated Rfid system with improved coverage and increased reading distance
WO2019097106A1 (en) * 2017-11-16 2019-05-23 Confidex Oy Rfid transponder

Also Published As

Publication number Publication date
WO2020261168A1 (en) 2020-12-30
FI20225051A1 (en) 2022-01-24
SE1950795A1 (en) 2020-12-27
FI130267B (en) 2023-05-24

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