WO2018198082A1 - Système d'antenne pour lecteur nfc - Google Patents

Système d'antenne pour lecteur nfc Download PDF

Info

Publication number
WO2018198082A1
WO2018198082A1 PCT/IB2018/052929 IB2018052929W WO2018198082A1 WO 2018198082 A1 WO2018198082 A1 WO 2018198082A1 IB 2018052929 W IB2018052929 W IB 2018052929W WO 2018198082 A1 WO2018198082 A1 WO 2018198082A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
flat spiral
solenoid
spiral antenna
antennas
Prior art date
Application number
PCT/IB2018/052929
Other languages
English (en)
Inventor
Miroslav Florek
Original Assignee
Smk-Logomotion Corporation
Logomotion, S.R.O.
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 Smk-Logomotion Corporation, Logomotion, S.R.O. filed Critical Smk-Logomotion Corporation
Priority to EP18730101.5A priority Critical patent/EP3628104A1/fr
Publication of WO2018198082A1 publication Critical patent/WO2018198082A1/fr

Links

Classifications

    • 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
    • H01Q7/06—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 with core of ferromagnetic material
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/43—Antennas

Definitions

  • the invention concerns an antenna system which has solenoid transmission (emitting) antenna and a flat spiral receiving antenna, whereby the antennas have a connection and mutual arrangement where on a small available space an NFC reader with the active load modulation and card emulation mode can be created.
  • NFC platform operates mainly in a band 13,56 MHz and it can use one of the three main communication modes: passive, active or pseudo-passive.
  • NFC readers usually have form of larger devices or they are parts of the larger devices where they have sufficient space for placement of the large NFC flat antenna which has a necessary radiation power.
  • NFC platform originally did not expected the reduction or miniaturization of the NFC readers (PCD); miniaturization has hitherto concerned only NFC transponders (PICC) which have various form, for example a form of the flat payment card or microSD card.
  • PCD reduction or miniaturization of the NFC readers
  • PICC NFC transponders
  • NFC reader while its communication capability is maintained would allow to implement PCD into various mobile devices, for example a mobile phone.
  • the NFC will not only have a functionality of the transponder, but it will be capable, as NFC reader itself, to contactlessly communicate with other transponders, for example a payment card.
  • Patent file US 20010026244 A1 discloses two antennas, where one is a flat antenna with a loop and the other is solenoid antenna with a core. The mutual position of both antennas does not solve the lack of available space; the antennas can be of any size and they are unsuitable for an NFC reader. Proposed invention solves the problem of miniaturization of NFC reader, mainly of the available surface on the printed circuit is smaller than 150mm 2 .
  • the antenna system mainly for NFC reader, which involves a solenoid antenna with a ferrite core and a flat spiral antenna with a loop, where the conductors in the loop on the opposite sides of the spiral run as parallel lines and thereby they produce two lateral sides of a flat spiral antenna, and where the solenoid antenna and a flat spiral antenna are placed in the same basic plane or in the mutually parallel basic planes, according to this invention, which essence lies in the fact that it involves two solenoid antennas with a ferrite core which are placed in a mutually parallel way and outside the spiral antenna, whereby the longitudinal axes of the solenoid antennas are parallel with the lateral sides of the flat spiral antenna and the distance between the longitudinal axes of the solenoid antennas is 0,5 to 1 ,25 times the width of the flat spiral antenna at most.
  • the width of the flat spiral antenna is a transversal dimension of the antenna in the direction from one lateral side to the opposite lateral side of the antenna; it is thus the distance between the edges of the flat spiral antenna oriented in the same direction as the distance between the longitudinal axes of the solenoid antennas is oriented.
  • solenoid antenna denotes a cylindrical coil with multiple windings of the conductor on the core, where the length of the coil is larger than its diameter; usually the length of the coil is five times its diameter.
  • the core can be from ferrite of other material with similar magnetic features.
  • the solenoid antennas will have identical elements and both solenoid antennas will be connected together to the output of the excitation element. Uusually both solenoid antennas will be placed not only in parallel, but also covered by each other in the x axis; that is, the positional values of the ends on the y axis will be identical (figure 1 ).
  • the solenoid antennas are placed in such a way that the continuation of their longitudinal axis delimits a zone in which the flat spiral antenna - or significant part of it - will be present. It will be preferable if the arrangement of all three antennas is symmetrical; that is, the flat spiral antenna is in the middle of the strip which is defined by prolonged longitudinal axes of the solenoid antennas, whereby the groundplans of the solenoid antennas and a flat spiral antenna do not overlap.
  • the mutual distance of the paralle solenoid antennas defines the width of the strip in which the flat spiral antenna is unfolded.
  • the module of the NFC reader will have a printed circuit in a shape of the strip which is divided to a zone with the solenoid antennas and the zone with the spiral antenna.
  • the solenoid antennas will be placed alongside the edges of the strip and flat spiral antenna will be placed on the opposite side of the strip, whereby it will reach to the edges of the strip.
  • the solenoid antennas and the flat spiral antenna can be placed on a single side of the flat printed circuit; in such case they are placed in the identical basic plane. There is a free space between two solenoid antennas on the printed circuit where the electronic components can be placed, for example NFC chip. If the printed circuit creates independent NFC reader module, the solenoid antennas will be placed on the edge of the printed circuit.
  • the flat spiral antenna stretches outside the zone with the solenoid antennas, whereby the edge loop of the flat spiral antenna will stretch to the edge of the printed circuit. In order to use the available surface well, the flat spiral antenna can be placed on the opposite surface of the printed circuit.
  • the first surface of the printed circuit will carry solenoid antennas and all active and passive components of the circuits; on the other (opposite) side of the printed circuit a flat spiral antenna will be produced; the thickness of this antenna cannot be more than the thickness of the conductor of the printed circuit.
  • the flat spiral antenna can be produced in such a way that the spiral begins in the middle of the surface or in the middle zone of the surface or it can have a form of the frame spiral, where the windings of the loop are contained in the frame formed by the four strips alongside the circumference of the surface.
  • the flat spiral antenna will mostly have a quadrangular shape, preferably rectangular or square, eventually with rounded peaks.
  • the flat spiral antenna can have a curved shape of the parts of the loop, but lateral sides alongside the prolonged longitudinal axes of the solenoid antennas will be formed by straight lines in order to achieve the effect of mutual operation of multiple magnetic fields of the solenoid antennas and a flat spiral antenna.
  • the antenna system according to this invention will usually have mutually symmetric and orthogonal arrangement of all antennas.
  • the significant advantage of the proposed invention is the achievemen of a high radiating power (emitting power) at small available surface of the module.
  • Two solenoid antennas are connected to the same excitation element, whereby they have an arrangement where they are capable of radiating sufficient power in order to excite the transponder (PICC).
  • the flat spiral antenna is capable of receiving the signal from the transponder (PICC) with the sufficient isolation from the excitation element, whereby no significant voltage is induced on the flat spiral antenna from the excitation of the solenoid antennas.
  • the mutual spatial configuration of the antennas is suitable for the shape of the antennas of the transponders (PICC); the magnetic field of two emitting antennas has such position against the receiving antenna which corresponds to the circular loops of the transponders' (PICC) antennas.
  • the advantage of the invention is the simple arrangement of the antenna system and simple connection of the respective circuits, too, whereby thanks to the physical bonds between the emitting (transmitting) antennas and receiving antenna the advantageous course of the magnetic field is achieved.
  • the antenna system according to this invention can be connected to the existing NFC chips which increases its practical applicability without the need to design a new NFC chip.
  • Figure 1 is a groundplan view of the NFC reader module where only the positions of individual antennas, without most of the electronic elements of the module, are depicted.
  • the flat spiral antenna is depicted by the dashed line, which means that it is placed from below of the printed circuit board.
  • Figure 2 is a lateral view of the NFC reader module's board, where the placement of the solenoid antennas from the one side and flat spiral antennas from the other side of the printed circuit board is depicted.
  • Figure 3 is a block diagram (block scheme) of the connection of three antennas to the amplifier and to the NFC chip. The shape of the spiral antenna is for illustration purposes only.
  • Figure 4 depicts the position of the flat spiral antenna between two prolonged longitudinal axes of the solenoid antennas, where the flat spiral antenna comes out of the middle of the rectangular surface.
  • Figure 5 depicts the position of the flat spiral antenna between the prolonged longitudinal axes of the solenoid antennas, where the flat spiral antenna has a frame shape and the conductors of the loops are placed within the frame of the circumferential strip.
  • Figure 6 is a spatial view of the NFC reader module, where on the top surface of the printed circuit board an NFC chip is depicted between the solenoid antennas.
  • the arrow in position number 1 points to the placement of the flat spiral antenna on the back side of the printed circuit board.
  • Figure 7 is a spatial view of the NFC reader module with the antenna system and mounted elements. Arrow in position number 1 points to the placement of the flat spiral antenna on the back side of the printed circuit board.
  • the NFC reader module is produced on the independent printed circuit board 5 with connectors for connection to the host device.
  • the printed circuit board 5 in this example has following dimensions: 8 x 17 x 1 ,5 mm.
  • Antenna system is placed on it as well as all active and passive elements of the NFC reader.
  • the printed circuit board 5 On the edges of the printed circuit board 5 there are two solenoid antennas 2, 3 placed in parallel. Electronic components of the NFC reader, including NFC chip 7, are mounted in the surface between them. This part of the printed circuit board is a first zone.
  • the second zone of the printed circuit board 5 carries a flat spiral antenna 1 which is produced on the opposite surface of the printed circuit board 5; that is, from below the printed circuit board 5. Other electronic components of the NFC reader module are mounted in this second zone on the top surface.
  • the solenoid antennas 2, 3 have a ferrite core which is approximately 9 mm long.
  • the flat spiral antenna has a groundplan of the rectangle and in this example it has 8 threads; in another realization it can have, for example, 6 threads.
  • the magnetic center of the flat spiral antenna 1 is in the middle between the prolonged longitudinal axes 4 of the solenoid antennas 2, 3.
  • the flat spiral antenna is placed in a strip which is defined by prolonged longitudinal axes 4 of the solenoid antennas 2, 3.
  • the solenoid antennas 2, 3 are covering each other mutually; their ends reach identically to the corners of the printed circuit board 5.
  • the solenoid antennas 2, 3 are connected to the common output of the excitation element.
  • the NFC reader reads the transponder reliably; the transponder approachs it at distance of 10 to 20 mm depending on the diameter of the coil of the antenna in the transponder.
  • the device worked smoothly, withou problems in the "card emulation" regime with operating voltage both 2,7 V and 5,0 V.
  • the results of the test of load modulation are:
  • the industrial applicability is obvious. According to this invention it is possible to industrially and repeatedly compose and use the antenna system with two solenoid antennas to transmit and one flat spiral antenna to receive the signal with high radiating power on the small available surface, mainly within the NFC reader module.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Near-Field Transmission Systems (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne deux antennes solénoïde (2, 3) avec un noyau de ferrite qui sont placées mutuellement en parallèle et à l'extérieur du plan de masse de l'antenne à spirale plate (1). Des axes longitudinaux (4) des antennes solénoïde (2, 3) sont en parallèle avec les côtés latéraux de l'antenne à spirale plate (1) et la distance entre les axes longitudinaux (4) des antennes solénoïde (2, 3) est d'au minimum 0,5 à 1,25 fois la largeur de l'antenne à spirale plate (1). Le milieu de l'antenne à spirale plate (1) se trouve dans une zone définie par les axes longitudinaux prolongés (4) des antennes solénoïde (2, 3). Les antennes solénoïde (2, 3) sont connectées à la même sortie de l'élément d'excitation; de préférence, les antennes solénoïde (2, 3) sont identiques. L'antenne à spirale plate (1) peut être connectée à la puce NFC (7) à travers l'amplificateur à faible bruit (6). Les antennes solénoïde (2, 3) peuvent être sur un côté de la carte de circuit imprimé (5) et l'antenne à spirale plate (1) peut être sur le côté opposé de la carte de circuit imprimé (5).
PCT/IB2018/052929 2017-04-27 2018-04-27 Système d'antenne pour lecteur nfc WO2018198082A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18730101.5A EP3628104A1 (fr) 2017-04-27 2018-04-27 Système d'antenne pour lecteur nfc

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SK50031-2017A SK500312017A3 (sk) 2017-04-27 2017-04-27 Anténna sústava, najmä na NFC čítačku
SKPP50031-2017 2017-04-27

Publications (1)

Publication Number Publication Date
WO2018198082A1 true WO2018198082A1 (fr) 2018-11-01

Family

ID=62563200

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2018/052929 WO2018198082A1 (fr) 2017-04-27 2018-04-27 Système d'antenne pour lecteur nfc

Country Status (3)

Country Link
EP (1) EP3628104A1 (fr)
SK (1) SK500312017A3 (fr)
WO (1) WO2018198082A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040135690A1 (en) * 2003-01-14 2004-07-15 Copeland Richard L. Wide exit electronic article surveillance antenna system
SK500142009A3 (sk) * 2009-03-12 2010-10-07 Logomotion, S. R. O. Vyberateľná karta na bezkontaktnú komunikáciu, použitie a spôsob výroby
US20130181876A1 (en) * 2010-09-07 2013-07-18 Murata Manufacturing Co., Ltd. Antenna device and communication terminal apparatus
US20140375262A1 (en) * 2012-02-17 2014-12-25 Panasonic Corporation Wireless charging module and mobile terminal provided with same
US20160268686A1 (en) * 2015-03-13 2016-09-15 Samsung Electro-Mechanics Co., Ltd. Antenna apparatus and electronic device including the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040135690A1 (en) * 2003-01-14 2004-07-15 Copeland Richard L. Wide exit electronic article surveillance antenna system
SK500142009A3 (sk) * 2009-03-12 2010-10-07 Logomotion, S. R. O. Vyberateľná karta na bezkontaktnú komunikáciu, použitie a spôsob výroby
US20130181876A1 (en) * 2010-09-07 2013-07-18 Murata Manufacturing Co., Ltd. Antenna device and communication terminal apparatus
US20140375262A1 (en) * 2012-02-17 2014-12-25 Panasonic Corporation Wireless charging module and mobile terminal provided with same
US20160268686A1 (en) * 2015-03-13 2016-09-15 Samsung Electro-Mechanics Co., Ltd. Antenna apparatus and electronic device including the same

Also Published As

Publication number Publication date
SK500312017A3 (sk) 2018-11-05
EP3628104A1 (fr) 2020-04-01

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