EP3628104A1 - Antenna system for nfc reader - Google Patents

Antenna system for nfc reader

Info

Publication number
EP3628104A1
EP3628104A1 EP18730101.5A EP18730101A EP3628104A1 EP 3628104 A1 EP3628104 A1 EP 3628104A1 EP 18730101 A EP18730101 A EP 18730101A EP 3628104 A1 EP3628104 A1 EP 3628104A1
Authority
EP
European Patent Office
Prior art keywords
antenna
flat spiral
solenoid
spiral antenna
antennas
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP18730101.5A
Other languages
German (de)
French (fr)
Inventor
Miroslav Florek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMK Logomotion Corp
Logomotion sro
Original Assignee
SMK Logomotion Corp
Logomotion sro
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 Corp, Logomotion sro filed Critical SMK Logomotion Corp
Publication of EP3628104A1 publication Critical patent/EP3628104A1/en
Pending legal-status Critical Current

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
    • H04B5/26—
    • H04B5/43—

Definitions

  • 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.
  • 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.
  • 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.
  • 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.

Abstract

Two solenoid antennas (2, 3) with a ferrite core are placed mutually in parallel and outside the groundplan of the flat spiral antenna (1). Longitudinal axes (4) of the solenoid antennas (2, 3) are in parallel with the lateral sides of the flat spira antenna (1) and the distance between the longitudinal axes (4) of the solenoid antennas (2, 3) is 0,5 to 1,25 times the width of the flat spiral antenna (1) at most. The middle of the flat spira antenna (1) lies in a zone defined by the prolonged longitudinal axes (4) of the solenoid antennas (2, 3). The solenoid antennas (2, 3) are connected to the same output of the excitation element; preferably the solenoid antennas (2, 3) are identical. The flat spiral antenna (1) can be connected to the NFC chip (7) thorugh the low noise amplifier (6). The solenoid antennas (2, 3) can be on one side of the printed circuit board (5) and the flat spiral antenna (1) can be on the opposite side of the printed circuit board (5).

Description

ANTENNA SYSTEM FOR NFC READER Field of technology
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.
Prior state of the art
During the communication by means of NFC platform, mainly according to ISO/IEC 14443, the flat spiral antennas are preferentially used. 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. The reduction of the dimensions of NFC reader while its communication capability is maintained would allow to implement PCD into various mobile devices, for example a mobile phone. In such case 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.
Publication US 2015256223 A1 uses two variously large angennas with predefined mutual configuration; one antenna serves for reception and the other antenna serves for transmission; both antennas are, however, standard flat spiral antennas, which require a lot of available space. 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 150mm2.
Essence of the invention
The abovementioned deficiencies are significantly remedied by 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.
The term 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. In the preferable arrangement 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 ).
After such distribution of the distances 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. In a preferable arrangement 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.
Longitudinal axes of both solenoid antennas are parallel and the middle of the spiral antenna lies in the middle between the prolonged longitudinal axes of the solenoid antennas. The solenoid antennas are placed outside the spiral antenna which means that the groundplans of the solenoid antennas and a flat spiral antenna do not overlap.
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. This arrangement achieves a compact construction of the NFC reader module.
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 number of threads of solenoid antennas L2 depends on the permeability of the core, but usually the resulting value of induction L2 for NFC applications should be with the range 1 - 2μΗ and quality should be within the range Q=18-22. The receiving flat spiral antenna can have, for example, from 6 to 8 threads; quality Q=4-6 suffices. It can be connected to existing NFC chips either directly or by an independent amplifier if the boos of the amplifier in the NFC chip is insufficient to process the signal.
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). At the same time, 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.
Description of drawings
The invention is further disclosed by means of the figures 1 to 7. The particular depicted solenoid antennas, the flat spiral antenna and the examples of mutual dimensions are for illustration purposes only and cannot be interpreted as limiting the scope of protection.
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. Example of realization
In the examples according to figures 1 , 2, 3, 5 to 7 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.
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:
In the "read/write" regime to solenoid antennas 2, 3 connected in parallel, with supply of 5 V, have enough power for the transponder's (PICC) needs. The load modulation in "read/write" regime has following results:
Industrial applicability
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.
List of related symbols and acronyms
1 - flat spiral antenna L1
2 - solenoid antenna L2
3 - solenoid antenna L3
4 - longitudinal axis
5 - printed circuit board
6 - amplifier
7 - NFC chip
D - distance between the longitudinal axes of the solenoid antennas b - width of the flat spiral antenna x, y, z - axes of the orthogonal coordinate system
NFC - Near field communication
PICC - Proximity inductive coupling card, transponder
PCD - Proximity coupling device, reader

Claims

PAT E N T C L A
An antenna system, mainly for an NFC reader, includes a solenoid antenna with a ferrite core, a flat spiral antenna (1) with a loop, where conductors in the loop on opposite sides of a spiral run as parallel straight lines and thereby produce two lateral sides of the flat spiral antenna (1), and where the solenoid antenna and the flat spiral antenna (1) are placed in a same basic plane or in the mutually parallel basic planes, is characterized by the fact, that it includes two solenoid antennas (2, 3) with the ferrite core which are placed in a mutually parallel way and outside a surface of the flat spiral antenna (1),
whereby longitudinal axes (4) of the solenoid antennas (2, 3) are parallel with the lateral sides of the flat spiral antenna (1);
a distance between the longitudinal axes (4) of the solenoid antennas (2, 3) ranges from 0,5 to 1 ,25 times a width of the flat spiral antenna (1 ) at most, and a middle of the flat spiral antenna (1) lies in a zone delimited by the longitudinal axes (4) of the solenoid antennas (2, 3).
The antenna system, mainly for the NFC reader according to the claim 1 i s characterized by the fact, that the solenoid antennas (2, 3) are identical.
The antenna system, mainly for the NFC reader according to the claim 1 or
2 i s characterized by the fact, that the solenoid antennas (2, 3) are connected to a same output of an excitation element.
The antenna system, mainly for the NFC reader according to any of the claims 1 to 3 is characterized by the fact, that the distance between the longitudinal axes (4) of the solenoid antennas (2, 3) corresponds to the width of the flat spiral antenna (1); the solenoid antennas (2,
3) are placed in the same distance from the flat spiral antenna (1 ), whereby the middle of the flat spiral antenna (1 ) is in a center of a strip which is delimited by the prolonged longitudinal axes
(4) of the solenoid antennas (2, 3).
5. The antenna system, mainly for the NFC reader according to any of the claims 1 to 4 is characterized by the fact, that a resulting induction value of the solenoid antenna (2, 3) ranges from 1 to 2μΗ.
6. The antenna system, mainly for the NFC reader according to any of the claims 1 to 5 i s characterized by the fact, that the flat spiral antenna (1 ) has 8 to 6 threads.
7. The antenna system, mainly for the NFC reader according to any of the claims 1 to6 is characterized by the fact, that it is placed on a printed circuit board (5), where the solenoid antennas (2, 3) and at least one electronic element of the NFC reader are placed on one side of the printed circuit board (5) and the flat spiral antenna (1) is placed on opposite side of the printed circuit board (5), outside the groundplan of the solenoid antennas (2, 3).
8. The antenna system, mainly for the NFC reader according to any of the claims 1 to 7 i s characterized by the fact, that the flat spiral antenna (1) has a quadrangular, preferably rectangular shape.
9. The antenna system, mainly for the NFC reader according to any of the claims 1 to 8 i s characterized by the fact, that the flat spiral antenna (1) has a frame shape where the conductors of the loops are placed within a circumferential strip forming a frame of the flat spiral antenna (1 ), whereby the prolonged longitudinal axes (4) run through strips on the lateral side of the flat spiral antenna (1 ), preferably they run through the middle of these strips.
10. The antenna system, mainly for the NFC reader according to any of the claims 1 to 9 i s characterized by the fact, that the flat spiral antenna (1) is connected to an NFC chip (7) through a low noise amplifier (6)
11. The antenna system, mainly for the NFC reader according to any of the claims 1 to9 is characterized by the fact, that an emission of the solenoid antennas (2, 3) is at a same time synchronized with a signal received on the receiving flat spiral antenna (1).
12. The antenna system, mainly for the NFC reader according to any of the claims 1 to 11 is characterized by the fact, that it is placed on a surface smaller than 150 mm2.
EP18730101.5A 2017-04-27 2018-04-27 Antenna system for nfc reader Pending EP3628104A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SK50031-2017A SK500312017A3 (en) 2017-04-27 2017-04-27 Aerial system, especially for the NFC reader
PCT/IB2018/052929 WO2018198082A1 (en) 2017-04-27 2018-04-27 Antenna system for nfc reader

Publications (1)

Publication Number Publication Date
EP3628104A1 true EP3628104A1 (en) 2020-04-01

Family

ID=62563200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18730101.5A Pending EP3628104A1 (en) 2017-04-27 2018-04-27 Antenna system for nfc reader

Country Status (3)

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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7091858B2 (en) * 2003-01-14 2006-08-15 Sensormatic Electronics Corporation Wide exit electronic article surveillance antenna system
SK288874B6 (en) * 2009-03-12 2021-07-14 Smk Kk Removable card for contactless communication, use and method thereof
CN102959800B (en) * 2010-09-07 2015-03-11 株式会社村田制作所 Antenna apparatus and communication terminal apparatus
JP2013169122A (en) * 2012-02-17 2013-08-29 Panasonic Corp Non-contact charge module and portable terminal having the same
US10403979B2 (en) * 2015-03-13 2019-09-03 Samsung Electro-Mechanics Co., Ltd. Antenna apparatus and electronic device including the same

Also Published As

Publication number Publication date
WO2018198082A1 (en) 2018-11-01
SK500312017A3 (en) 2018-11-05

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