CN202662047U - Large-power RFID (Radio Frequency Identification) antenna using ISO14443TYPE A protocol - Google Patents

Large-power RFID (Radio Frequency Identification) antenna using ISO14443TYPE A protocol Download PDF

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Publication number
CN202662047U
CN202662047U CN 201220349695 CN201220349695U CN202662047U CN 202662047 U CN202662047 U CN 202662047U CN 201220349695 CN201220349695 CN 201220349695 CN 201220349695 U CN201220349695 U CN 201220349695U CN 202662047 U CN202662047 U CN 202662047U
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CN
China
Prior art keywords
antenna
power
pickup coil
matching circuit
radio frequency
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Expired - Fee Related
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CN 201220349695
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Chinese (zh)
Inventor
马一兵
赵烽
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Third Research Institute of the Ministry of Public Security
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Third Research Institute of the Ministry of Public Security
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Priority to CN 201220349695 priority Critical patent/CN202662047U/en
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Publication of CN202662047U publication Critical patent/CN202662047U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides a large-power RFID (Radio Frequency Identification) antenna using an ISO14443TYPE A protocol. The large-power RFID antenna mainly comprises the following components of a coupling coil, an antenna matching circuit, and a radio frequency cable, wherein the coupling coil is used for radiating radio frequency power and receiving returning signal power; the antenna matching circuit is matched with the coupling coil to form a turning circuit; and the radio frequency cable is used for transmitting signals, and converting antenna impedance, so as to be matched with the impedance of an RFID card reader.

Description

A kind of high-power RFID antenna of ISO14443TYPE A agreement
Technical field
The utility model relates to wireless communication field, relates in particular to a kind of high-power antenna for radio-frequency card.
Background technology
Radio-frequency card is the product that REID and ID card technique organically combine.It has solved passive and this difficult problem of contact-free, has convenient, characteristics efficiently, is widely used in E-Payment, passage control, public transport charge, Car park payment, dining room and sells the multiple occasions such as meal, work attendance and gate inhibition.
Radio-frequency card and bar code card, magnetic card, untouched ID card relatively have high security, high reliability, convenient to use.This mainly is to be determined by its technical characterstic, and the standard of mainly following in close coupled is used is ISO/IEC14443.According to the difference of signal sending and receiving mode, two kinds of card types of Type A, Type B have been defined among the ISO/IEC14443.Type category-A communication standard is a kind of standard of extensively using at present, it is the MIFARE standard, adopt 100%ASK modulation, synchronous sequence and Miller (Miller) coded system through revising, what use is the discontinuous modulation system, and namely when expression information " 1 ", representing has signal to card, when expression information " 0 ", do not have signal to card, this interval is quite short certainly, can not have influence on normal operation.The advantage of this mode is that the information difference is obvious, and the chance that is interfered is few, is not easy maloperation, and shortcoming is to need the constant energizing quantity of energy to it's time to card to have energy hunting.Type category-B communication standard is then to adopt 10%ASK modulation, asynchronous sequential and non-return-to-zero (NRZ) coded system, used a kind of modulation system of amplitude modulation, the difference of information " 1 " and " 0 " is the power that is signal, this point is subject to external interference easily, can adopt redundancy check to solve.Its advantage is continual signal transmission, the situation of energy hunting can not occur.By top relatively can finding out, two kinds of technology are difficult to distinguish quality, also are that the ISO tissue has been determined one of reason of two kinds of standards.Although the technical not significantly difference at application, but in the application aspect, the Type category-A has than the more manufacturer of Type category-B to be supported, the marketing aspect public transport of Type category-A is more successful than Type category-B, be the mainstream applications technology on the market, its follow-up support is better.On price because the popularity of Type category-A and the low side designability of chip itself, so that the Type category-A has larger advantage
The RFID antenna of ISO14443 Type A agreement in the market all is low power antenna, can't bear the radio-frequency power of 1W ~ 8W, and the Card Reader of corresponding read write line distance is all in 10cm, existing rfid interrogator can't be applied to needs long application scenario apart from Card Reader, has therefore limited the range of application of rfid interrogator.
The utility model content
The utility model provides a kind of high-power RFID antenna based on ISO14443TYPE A agreement for the deficiencies in the prior art part, to have solved the application problem of high-power RF power stage, increases the Card Reader distance of read write line.
To achieve these goals, the technology that the utility model adopts is a kind of high-power RFID antenna based on ISO14443TYPE A agreement, it is characterized in that described high-power antenna is mainly by forming with lower member:
Pickup coil, described pickup coil is used for radiated radio frequency (RF) power and accepts return signal power.
Antenna-matching circuit, described antenna-matching circuit and pickup coil are complementary and form tuned circuit.
RF cable, described RF cable be used for to transmit signal, and RF cable carries out conversion to described antenna impedance, to form and the impedance matching of RFID card reader.
In the preferred embodiment that the utility model provides, wherein said antenna is comprised of two pickup coils, antenna-matching circuit and RF cables, and described two pickup coils are connected in parallel on the junction with antenna-matching circuit.
In the preferred embodiment that the utility model provides, wherein said pickup coil adopts the copper cash of 0.5cm diameter as base material.
In the preferred embodiment that the utility model provides, wherein said antenna-matching circuit is condenser network.
In the preferred embodiment that the utility model provides, wherein said pickup coil is the rectangle frame structure of 30cm * 35cm.
In the preferred embodiment that the utility model provides, wherein said pickup coil is the rectangle frame structure of 32cm * 37cm.
In the preferred embodiment that the utility model provides, wherein said pickup coil is the circular frame structure of 33cm diameter.
In the preferred embodiment that the utility model provides, wherein said pickup coil is the circular frame structure of 35cm diameter.
In the preferred embodiment that the utility model provides, wherein said antenna resonant frequency is set in 13.56MHz.
Compared with prior art, the invention has the following advantages: utilize the conversion of RF cable and antenna impedance, realization and the optimum impedance coupling that rfid interrogator carries out realize output high-power RF signal, the Card Reader distance of increase read write line.
Description of drawings
Fig. 1 is the structural representation of the high-power RFID antenna among the embodiment 1.
Fig. 2 is the structural representation of the high-power RFID antenna among the embodiment 2.
Fig. 3 is the structural representation of the high-power RFID antenna among the embodiment 3.
Embodiment
It is a kind of based on the high-power RFID antenna of ISO14443TYPE A agreement in radio-frequency card that the utility model provides, utilize the conversion of RF cable and antenna impedance, realization and the optimum impedance coupling that rfid interrogator carries out realize output high-power RF signal, the Card Reader distance of increase read write line.
By the following examples high-power RFID antenna provided by the invention is described in further detail, in order to better understand the content of the invention, but the content of embodiment does not limit the protection domain of the invention.
Embodiment 1
As shown in Figure 1, the high-power antenna that provides of present embodiment is combined to form the unicoil rectangular pattern by pickup coil (1), antenna-matching circuit (2) RF cable (3) three parts.Pickup coil (1) is agent structures in the antenna as radiated radio frequency (RF) power and the parts that receive return signal power.Pickup coil (1) adopts the copper cash of 0.5cm diameter as base material, is made into the rectangle frame structure that is of a size of 30cm * 35cm.Pickup coil (1) is tuning coil, and pickup coil (1) is being parallel to antenna-matching circuit (2) junction.Antenna-matching circuit (2) is condenser network, and pickup coil (1) mates the formation tuned circuit with antenna-matching circuit (2).When the antenna resonance frequency was adjusted to 13.56MHz, the return loss of antenna was-6.5dB.Select 3 meters long RF cables (3) that antenna impedance is carried out conversion, with the optimum impedance coupling that realizes carrying out with rfid interrogator.
Embodiment 2
As shown in Figure 2, the high-power antenna that provides of present embodiment is combined to form the twin coil rectangular pattern by the first pickup coil (4), the second pickup coil (5), antenna-matching circuit (2) RF cable (3) four parts.The first pickup coil (4), the second pickup coil (5) are agent structures in the antenna as radiated radio frequency (RF) power and the parts that receive return signal power.The first pickup coil (4) adopts the copper cash of 0.5cm diameter as base material, is made into the rectangle frame structure that is of a size of 30cm * 35cm.The second pickup coil (5) adopts the copper cash of 0.5cm diameter as base material, is made into the rectangle frame structure that is of a size of 32cm * 37cm.The first pickup coil (4), the second pickup coil (5) are tuning coils, the first pickup coil (4) and the second pickup coil (5) are being parallel to antenna-matching circuit (2) junction, can regard the first pickup coil (4) and the second pickup coil (5) as a whole pickup coil.Antenna-matching circuit (2) is condenser network, and the first pickup coil (4) and the second pickup coil (5) mate the formation tuned circuit with antenna-matching circuit (2).When the antenna resonance frequency was adjusted to 13.56MHz, the return loss of antenna was-6.5dB.Select 3 meters long RF cables (3) that antenna impedance is carried out conversion, with the optimum impedance coupling that realizes carrying out with rfid interrogator.
Embodiment 3
As shown in Figure 3, the high-power antenna that provides of present embodiment is combined to form the twin coil rectangular pattern by the 3rd pickup coil (6), the second pickup coil (7), antenna-matching circuit (2) RF cable (3) four parts.The 3rd pickup coil (6), the 4th pickup coil (7) are agent structures in the antenna as radiated radio frequency (RF) power and the parts that receive return signal power.The 3rd pickup coil (6) adopts the copper cash of 0.5cm diameter as base material, is made into the circular frame structure that is of a size of diameter 33cm.The 4th pickup coil (7) adopts the copper cash of 0.5cm diameter as base material, is made into the circular frame structure that is of a size of diameter 35cm.The 3rd pickup coil (6), the 4th pickup coil (7) are tuning coils, the 3rd pickup coil (6) and the 4th pickup coil (7) are being parallel to antenna-matching circuit (2) junction, can regard the 3rd pickup coil (6) and the 4th pickup coil (7) as a whole pickup coil.Antenna-matching circuit (2) is condenser network, and the 3rd pickup coil (6) and the 4th pickup coil (7) mate the formation tuned circuit with antenna-matching circuit (2).When the antenna resonance frequency was adjusted to 13.56MHz, the return loss of antenna was-6.5dB.Select 3 meters long RF cables (3) that antenna impedance is carried out conversion, with the optimum impedance coupling that realizes carrying out with rfid interrogator.
More than specific embodiment of the utility model is described in detail, but it is as example, the utility model is not restricted to specific embodiment described above.To those skilled in the art, any equivalent modifications that this practicality is carried out and substituting also all among category of the present utility model.Therefore, not breaking away from impartial conversion and the modification of doing under the spirit and scope of the present utility model, all should be encompassed in the scope of the present utility model.

Claims (9)

1. the high-power RFID antenna of an ISO14443TYPE A agreement is characterized in that, described high-power antenna is mainly by forming with lower member:
Pickup coil, described pickup coil is used for radiated radio frequency (RF) power and accepts return signal power;
Antenna-matching circuit, described antenna-matching circuit and pickup coil are complementary and form tuned circuit;
RF cable, described RF cable be used for to transmit signal, and RF cable carries out conversion to described antenna impedance, to form and the impedance matching of RFID card reader.
2. high-power RFID antenna according to claim 1 is characterized in that, described antenna is comprised of two pickup coils, antenna-matching circuit and RF cables, and described two pickup coils are connected in parallel on the junction with antenna-matching circuit.
3. high-power RFID antenna according to claim 1 is characterized in that, described pickup coil adopts the copper cash of 0.5cm diameter as base material.
4. high-power RFID antenna according to claim 1 is characterized in that, described antenna-matching circuit is condenser network.
5. high-power RFID antenna according to claim 1 is characterized in that, described pickup coil is the rectangle frame structure of 30cm * 35cm.
6. high-power RFID antenna according to claim 1 is characterized in that, described pickup coil is the rectangle frame structure of 32cm * 37cm.
7. high-power RFID antenna according to claim 1 is characterized in that, described pickup coil is the circular frame structure of 33cm diameter.
8. high-power RFID antenna according to claim 1 is characterized in that, described pickup coil is the circular frame structure of 35cm diameter.
9. high-power RFID antenna according to claim 1 is characterized in that described antenna resonant frequency is set in 13.56MHz.
CN 201220349695 2012-07-19 2012-07-19 Large-power RFID (Radio Frequency Identification) antenna using ISO14443TYPE A protocol Expired - Fee Related CN202662047U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220349695 CN202662047U (en) 2012-07-19 2012-07-19 Large-power RFID (Radio Frequency Identification) antenna using ISO14443TYPE A protocol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220349695 CN202662047U (en) 2012-07-19 2012-07-19 Large-power RFID (Radio Frequency Identification) antenna using ISO14443TYPE A protocol

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CN202662047U true CN202662047U (en) 2013-01-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106125025A (en) * 2016-06-13 2016-11-16 公安部第研究所 Energy test analog card resonant frequency calibrating installation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106125025A (en) * 2016-06-13 2016-11-16 公安部第研究所 Energy test analog card resonant frequency calibrating installation

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130109

Termination date: 20160719