CN111710955A - Device and method for modulating near field communication card reader antenna - Google Patents
Device and method for modulating near field communication card reader antenna Download PDFInfo
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- CN111710955A CN111710955A CN202010561270.5A CN202010561270A CN111710955A CN 111710955 A CN111710955 A CN 111710955A CN 202010561270 A CN202010561270 A CN 202010561270A CN 111710955 A CN111710955 A CN 111710955A
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- card
- antenna
- coil
- electronic switch
- near field
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- 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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
Abstract
The invention discloses a device and a method for modulating an antenna of a near field communication card reader. The working method comprises the following steps: judging the type of the card by the independent work of the original antenna coil; the microprocessor controls the electronic switch according to the card reading condition; if the card is a normal card, the electronic switch is switched off, and the original antenna coil works independently to read; if the card is a high-impedance card or the modulation characteristic of the antenna needs to be switched, the electronic switch is conducted, and the signal modulation characteristic in the induction card reading magnetic field is changed. According to the technical scheme, the characteristics of the antenna signal are changed by increasing the electromagnetic mutual inductance effect between the control coil and the antenna coil of the near field communication card reader, so that the overshoot problem of the modulation signal is effectively reduced.
Description
Technical Field
The invention relates to the field of near field communication, in particular to a device and a method for modulating an antenna of a near field communication card reader.
Background
The application and detection standards of read-write equipment of corresponding financial non-contact payment cards are continuously standardized and strengthened along with the popularization and application of financial non-contact cards, a new authentication and detection requirement is provided for non-contact card readers on self-service equipment such as POS, ATM and the like in the current latest EMV3.0 Level 1 non-contact authentication standard, the original equipment generally cannot pass the authentication, and a new chip, a device and a technical scheme have to be used for authentication.
However, the existing chip and the existing technical scheme still have some uncertainties in debugging parameters and consistency design, and have a large influence on the parameters of the matching circuit of the original antenna, and often, chip technical support personnel are required to perform one-machine one-time debugging work in authentication detection, which undoubtedly increases the difficulty and a large amount of man-hours of debugging, and also increases the authentication cost and the product cost, thereby also influencing the popularization and application of products in later period.
Chinese patent document CN206564594U discloses an "ultrasonic welding method for lithium ion battery tab and tab welding protection method". The near field communication modulation and demodulation circuit comprises a plurality of near field antennas and at least one near field communication modulation and demodulation circuit, and the circuit comprises: the tag comprises a detection unit and a load modulation unit, wherein the load modulation unit is in a turn-off state when the tag receives data, so that the equivalent impedance of the near-field antenna is increased to realize anti-interference; the current input end of the load modulation unit is connected with the rectifying end of the detection unit, the control end of the load modulation unit is connected with the input/output interface of the processing chip, and the signal sending end of the load modulation unit is connected with the signal sending end of the processing chip. According to the technical scheme, the worker is required to do one-machine one-debugging work, the debugging difficulty and a large number of working hours are increased, and the authentication cost and the product cost are also increased.
Disclosure of Invention
The invention mainly solves the technical problems of complex authentication and debugging, high authentication cost and high product cost in the prior art, and provides a device and a method for modulating an antenna of a near field communication card reader.
The technical problem of the invention is mainly solved by the following technical scheme: a device for modulating an antenna of a near field communication card reader comprises an original antenna coil and a coupling coil, wherein the original antenna coil is connected with a microprocessor through an antenna matching circuit and a non-contact card read-write controller, and the coupling coil is connected with the microprocessor through an electronic switch. The original card reader microprocessor can control the opening and closing of the coil according to the card reading condition, so that the modulation signal of the original card reader antenna can be adjusted to adapt to the impedance characteristics of different non-contact cards, the compatibility of card reading is improved, and the standard detection requirements are better met.
Preferably, the coupling coil and the primary antenna coil are placed in a superposed manner. The mutual inductance effect between the coupling coil and the original card reader antenna is enhanced conveniently.
Preferably, the coil distance L between the coupling coil and the primary antenna coil is adjusted according to the actual characteristic between the coupling coil and the primary antenna coil, and is effectively adjusted within 1 CM.
Preferably, an induction card reading magnetic field is arranged between the superposed coupling coil and the coil of the primary antenna coil. The card is sensed and read by sensing the magnetic field of the card.
Preferably, the coupling coil implementation method includes: an enameled copper wire and an electronic switch or relay; printed circuit board coils plus electronic switches or relays; flexible printed circuit board electronic switches or relays.
An operating method of an apparatus for modulating an antenna of a near field communication card reader, comprising the steps of:
firstly, judging the type of the card by the independent work of an original antenna coil;
secondly, the microprocessor controls an electronic switch according to the card reading condition;
if the card is a normal card, the electronic switch is switched off, and the original antenna coil works independently to read; the electronic switch connected in series in the coupling coil is in a disconnected state, so that the influence on the magnetic field intensity and the signal modulation of the antenna can be reduced to the maximum extent, and the characteristics of the original card reader are ensured.
If the card is a card with high impedance characteristic, the electronic switch is conducted to change the signal modulation characteristic in the induction card reading magnetic field; the microprocessor controls the electronic switch to be in a conducting state, so that the mutual inductance effect of the coupling coil and the antenna of the original card reader is enhanced, the signal modulation characteristic in the induction card reading magnetic field is changed, and the card reading characteristic and compatibility of the card reader are improved.
If the antenna modulation characteristic needs to be switched, the electronic switch is switched on to change the antenna modulation characteristic.
Preferably, in the step 1, the card type is judged according to the reading result of the original antenna coil working independently, and if the card type can be read, the card type is a normal card; if it can not be read, it is a high impedance card.
Preferably, the control end of the coupling coil in the step 2 is connected with a microprocessor of the original card reader, and the microprocessor is controlled through a control pin.
Preferably, in the step 2, when the normal card is read, the electronic switch connected in series in the coupling coil is in an off state; when the card with high impedance characteristic is read or the antenna modulation characteristic needs to be switched, the microprocessor controls the electronic switch to be in a conducting state.
Preferably, the microprocessor controls the electronic switch to be in a conducting state, so that the coupling coil and the original antenna coil enhance a mutual inductance effect, and the signal modulation characteristic in the induction card reading magnetic field is changed.
The invention has the beneficial effects that:
1. the whole near field communication card reader device is flexibly compatible with impedance characteristics and detection requirements of various non-connected cards.
2. The method provides a simple, feasible and low-cost method for designing and manufacturing the card reader meeting the EMV3.0 Level 1 non-contact certification test requirement.
3. The circuit of the original card reader is little modified, particularly, the antenna matching circuit has little influence, and the conformity of EMV authentication detection to antenna modulation signals is greatly improved.
4. Has very wide application prospect and market value in the related field.
Drawings
Fig. 1 is a block diagram of a circuit schematic connection structure of the present invention.
In the figure, 1 an original antenna coil, 2 a coupling coil, 3 an induction card reading magnetic field, 4 coil intervals L, 5 an antenna matching circuit, 6 an electronic switch, 7 a non-contact card read-write controller and 8 a microprocessor.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the device for modulating the near field communication card reader antenna according to the embodiment comprises an original antenna coil 1 and a coupling coil 2, wherein the coupling coil 2 and the original antenna coil 1 are placed in an overlapping mode, and the coupling coil and the original card reader antenna are convenient to enhance the mutual inductance effect. The coil pitch L4 between the coupling coil 2 and the primary antenna coil 1 is adjusted according to the fact that the characteristics between the coupling coil 2 and the primary antenna coil 1 are not changed, and is effectively adjusted within 1 CM. An induction card reading magnetic field 3 is arranged between the coupling coil 2 and the original antenna coil 1 which are overlapped, and the card is induced and read through the induction card reading magnetic field. The implementation method of the coupling coil 2 comprises the following steps: an enameled copper wire and an electronic switch or relay; printed circuit board coils plus electronic switches or relays; flexible printed circuit board electronic switches or relays.
The original antenna coil 1 is connected with a microprocessor 8 through an antenna matching circuit 5 and a non-contact card read-write controller 7, and the coupling coil 2 is connected with the microprocessor 8 through an electronic switch 6. The original card reader microprocessor can control the opening and closing of the coil according to the card reading condition, so that the modulation signal of the original card reader antenna can be adjusted to adapt to the impedance characteristics of different non-contact cards, the compatibility of card reading is improved, and the standard detection requirements are better met.
An operating method of an apparatus for modulating an antenna of a near field communication card reader, comprising the steps of:
judging the type of the card according to the reading result of the original antenna coil 1 which works independently, and if the card can be read, judging the card to be a normal card; if it can not be read, it is a high impedance card.
And secondly, the control end of the coupling coil 2 is connected with a microprocessor 8 of the original card reader, and the microprocessor 8 is controlled through a control pin. The microprocessor 8 controls the electronic switch 8 according to the card reading condition. When a normal card is read, the electronic switch connected in series in the coupling coil is in an off state; when the card with high impedance characteristic is read or the antenna modulation characteristic needs to be switched, the microprocessor controls the electronic switch to be in a conducting state.
If the card is a normal card, the electronic switch 8 is switched off, and the original antenna coil 1 works independently to read, so that the influence on the magnetic field intensity and the signal modulation of the antenna can be reduced to the maximum extent, and the characteristics of the original card reader are ensured.
If the card is a card with high impedance characteristic, the microprocessor controls the electronic switch to be in a conducting state, so that the mutual inductance effect of the coupling coil and the original card reader antenna is enhanced, the signal modulation characteristic in the induction card reading magnetic field is changed, and the card reading characteristic and the compatibility of the card reader are improved.
If the antenna modulation characteristic needs to be switched, the electronic switch 8 is turned on to change the antenna modulation characteristic.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms coil, microprocessor, electronic switch, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. The device for modulating the near field communication card reader antenna is characterized by comprising an original antenna coil (1) and a coupling coil (2), wherein the original antenna coil (1) is connected with a microprocessor (8) through an antenna matching circuit (5) and a non-contact card read-write controller (7), and the coupling coil (2) is connected with the microprocessor (8) through an electronic switch (6).
2. An arrangement for modulating a near field communication reader antenna according to claim 1, characterized in that the coupling coil (2) is placed in superposition with the primary antenna coil (1).
3. A device for modulating an antenna of a near field communication card reader as claimed in claim 1, characterized in that the coil distance L (4) between the coupling coil (2) and the primary antenna coil (1) is adjusted according to the fact that the characteristic between the coupling coil (2) and the primary antenna coil (1) is not changed, and the adjustment is effective within 1 CM.
4. A device for modulating a near field communication reader antenna according to claim 2, characterized in that an inductive reading magnetic field (3) is provided between the superposed coupling coil (2) and the coil of the original antenna coil (1).
5. An arrangement for modulating a near field communication reader antenna according to claim 1, characterized in that the coupling coil (2) implementation method comprises: an enameled copper wire and an electronic switch or relay; printed circuit board coils plus electronic switches or relays; flexible printed circuit board electronic switches or relays.
6. An operating method of an apparatus for modulating an antenna of a near field communication card reader, comprising the steps of:
① judging the card type by the independent work of the original antenna coil (1)；
② the microprocessor (8) controls the electronic switch (8) according to the card reading condition；
③ if it is a normal card，The electronic switch (8) is turned off，The primary antenna coil (1) works independently for reading；
④ card with high impedance characteristic，The electronic switch (8) is conducted，Changing the signal modulation characteristics in the induction card reading magnetic field;
⑤ switching antenna modulation characteristics if necessary，The electronic switch (8) is conducted，Varying antenna modulation characteristics。
7. The working method of the device for modulating the antenna of the near field communication card reader according to claim 6, wherein the step 1 judges the type of the card according to the reading result of the original antenna coil (1) working independently, if the card can be read, the card is a normal card; if it can not be read, it is a high impedance card.
8. The working method of the device for modulating the antenna of the near field communication card reader according to the claim 1, wherein the control end of the coupling coil (2) in the step 2 is connected with a microprocessor (8) of the original card reader, and the microprocessor (8) is controlled through a control pin.
9. The method for operating the device for modulating the antenna of the near field communication card reader as claimed in claim 6, wherein the step 2 is to make the electronic switch connected in series in the coupling coil in an off state when reading a normal card; when the card with high impedance characteristic is read or the antenna modulation characteristic needs to be switched, the microprocessor controls the electronic switch to be in a conducting state.
10. The method of claim 9, wherein the microprocessor controls the electronic switch to be in a conducting state, so that the coupling coil (2) and the original antenna coil (1) enhance a mutual inductance effect, and a signal modulation characteristic in an induction card reading magnetic field is changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010561270.5A CN111710955A (en) | 2020-06-18 | 2020-06-18 | Device and method for modulating near field communication card reader antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010561270.5A CN111710955A (en) | 2020-06-18 | 2020-06-18 | Device and method for modulating near field communication card reader antenna |
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| Publication Number | Publication Date |
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| CN111710955A true CN111710955A (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010561270.5A Pending CN111710955A (en) | 2020-06-18 | 2020-06-18 | Device and method for modulating near field communication card reader antenna |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| US20070285255A1 (en) * | 2006-06-08 | 2007-12-13 | Sony Ericsson Mobile Communications Japan, Inc. | Wireless communication terminal apparatus and method of controlling same |
| CN101454685A (en) * | 2006-05-30 | 2009-06-10 | 皇家飞利浦电子股份有限公司 | Detuning a radio-frequency coil |
| JP2012139033A (en) * | 2010-12-27 | 2012-07-19 | Nec Tokin Corp | Non-contact power transmission system and power reception antenna |
| CN103907241A (en) * | 2012-01-30 | 2014-07-02 | 株式会社村田制作所 | Antenna device, card-type communications device, and communications terminal device |
| EP3258412A1 (en) * | 2016-06-17 | 2017-12-20 | Intermec Inc. | Systems and methods for compensation of interference in radiofrequency identification (rfid) devices |
| CN206907076U (en) * | 2017-07-14 | 2018-01-19 | 金邦达有限公司 | The IC-card of noncontact antenna frequency can be changed |
| CN111211816A (en) * | 2020-02-27 | 2020-05-29 | 成都科鸿凌泰自动识别技术有限公司 | Multi-antenna automatic matching system based on high-frequency radio frequency identification |
| CN212433769U (en) * | 2020-06-18 | 2021-01-29 | 东方通信股份有限公司 | Device for modulating near field communication card reader antenna |
-
2020
- 2020-06-18 CN CN202010561270.5A patent/CN111710955A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| CN101454685A (en) * | 2006-05-30 | 2009-06-10 | 皇家飞利浦电子股份有限公司 | Detuning a radio-frequency coil |
| US20070285255A1 (en) * | 2006-06-08 | 2007-12-13 | Sony Ericsson Mobile Communications Japan, Inc. | Wireless communication terminal apparatus and method of controlling same |
| JP2012139033A (en) * | 2010-12-27 | 2012-07-19 | Nec Tokin Corp | Non-contact power transmission system and power reception antenna |
| CN103907241A (en) * | 2012-01-30 | 2014-07-02 | 株式会社村田制作所 | Antenna device, card-type communications device, and communications terminal device |
| EP3258412A1 (en) * | 2016-06-17 | 2017-12-20 | Intermec Inc. | Systems and methods for compensation of interference in radiofrequency identification (rfid) devices |
| CN206907076U (en) * | 2017-07-14 | 2018-01-19 | 金邦达有限公司 | The IC-card of noncontact antenna frequency can be changed |
| CN111211816A (en) * | 2020-02-27 | 2020-05-29 | 成都科鸿凌泰自动识别技术有限公司 | Multi-antenna automatic matching system based on high-frequency radio frequency identification |
| CN212433769U (en) * | 2020-06-18 | 2021-01-29 | 东方通信股份有限公司 | Device for modulating near field communication card reader antenna |
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Application publication date: 20200925 |