CN102523022B - Active mini near field communication antenna system - Google Patents
Active mini near field communication antenna system Download PDFInfo
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- CN102523022B CN102523022B CN201110380889.7A CN201110380889A CN102523022B CN 102523022 B CN102523022 B CN 102523022B CN 201110380889 A CN201110380889 A CN 201110380889A CN 102523022 B CN102523022 B CN 102523022B
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Abstract
The invention discloses an active micro near field communication antenna system, which comprises an antenna, and a receiver and a transmitter respectively connected with the antenna, wherein the transmitter comprises an active transmission circuit connected with the antenna, a modulation-demodulation system connected with the active transmission circuit by a circuit, and a digital transmission system connected with the modulation-demodulation system by the circuit. The transmitter mentioned in the invention is provided with the active transmission circuit, and the antenna system adopts an active transmission mode, so that the antenna system can adopt a small-size antenna to present an effect like the transmission of a large antenna, thereby providing possibility for reducing the structural size of the antenna, realizing reduction of the size of the antenna, and making the antenna system be conveniently integrated in a system small in size.
Description
Technical field
The present invention relates to a kind of near field communication system, be specifically related to a kind of active mini near field communication antenna system.
Background technology
At present, in the low coverage wireless telecommunications of prior art, passive antenna system often adopts between antenna and card reader carries out wireless telecommunications, and system obtains antenna reflection by modulating the impedance of antenna changes and reaches the effect of transmission.In existing wireless telecommunications, nfc card is passive, and card reader needs the change of the impedance of the antenna detecting nfc card.It bundle of lines carrier wave reflects back card reading system, by changing its impedance, and the reflected signal that data are modulated onto, but because the energy dose-effect of reflection is little, antenna needs larger.If antenna is too little, card reader just cannot detect this change, and some card also needs the energy being received the carrier wave that card reader sends by antenna in addition, provides the power supply of intercommunication module, so wireless telecommunications in the prior art use large antenna usually.Its shortcoming is, adopts large antenna comparatively large due to structure, is difficult to be integrated in microsystem.
Summary of the invention
The invention provides a kind of active mini near field communication antenna system, while making the expanded range of communication system, use less antenna size, expand system looks scope.
For achieving the above object, the invention provides a kind of active mini near field communication antenna system, this system comprises antenna, and the receiver be connected with this antenna circuit respectively, and reflector; Be characterized in, above-mentioned reflector comprises the active transmission circuit be connected with antenna circuit, the modulation demodulation system be connected by circuit with active transmission circuit, and the digital transmission system be connected with modulation demodulation system circuit.
Above-mentioned receiver comprises the gain adjusting system, calibration circuit, signal amplitude detection system and the phase locking circuit that are connected with antenna circuit respectively.
The length of above-mentioned antenna and be widely less than 3 centimetres.
A kind of active mini near field communication antenna system of the present invention compared to the prior art, its advantage is, reflector of the present invention is provided with active transmission circuit, antenna system adopts active transmission means, realize this antenna system and can adopt undersized antenna to produce effect as large antenna-reflected, thus be that the structure size reducing antenna provides feasibility, realize the downsizing of antenna size, make antenna system be convenient to be integrated in the little system of volume.
Accompanying drawing explanation
Fig. 1 is the circuit module figure of active mini near field communication antenna system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
As shown in Figure 1, disclose a kind of embodiment of active mini near field communication antenna system, it adopts external power source to drive the passive system of replacement prior art to be driven by antenna, realizes antenna system and adopts undersized antenna to carry out information transmission.
The antenna system of the present embodiment is the antenna system be arranged in the card reader of near-field communication.This card reader is by communicating between this antenna system with nfc card.
This antenna system comprises antenna 1, and the receiver 2 of the NFC system compatibility be connected with this antenna 1 circuit respectively and active reflector 3.
The length of antenna 1 and be widely all less than 3 centimetres, it is a kind of near-field coupling antenna, and because 13.56Mhz wavelength is very long, and reading/writing distance is very short, and suitable coupled modes are magnetic Field Couplings, and coil is suitable coupled modes.Industry usually adopts magnetic thin film (as the companies such as TDK produce) laminating FPC mode to make antenna in mobile phone.Two ports of this antenna 1 are connected with receiver 2 and reflector 3 circuit simultaneously respectively.
Reflector 3 comprises the active transmission circuit 33 be connected with antenna 1 circuit, the modulation demodulation system 32 be connected with this active transmission circuit 33 circuit, and the digital transmission system 31 be connected with this modulation demodulation system 32 circuit.
Active transmission circuit 33 is low-impedance drive circuit, and can adopt any a active transmission circuit, it is for driven antenna 1.In the active antenna system that the present invention adopts, the antenna 1 that size is little can not reflect that enough energy detect.But, include drive circuit and energy resource consumption that active transmission circuit 7 provides in, just can transmit the waveform being equivalent to the reflection of passive large-size antennae.When native system is configured on card reader or main frame, the carrier waveform that active transmission circuit 33 is used for producing 13.56MHz or approximate frequency by antenna 1 wireless transmission to nfc card.
When modulation demodulation system 32 is for being configured on main frame or reader at native system, detect other similar customer equipment or modulated signals.Impedance is reflected back to the embodiment of the energy of reader with the antenna system of the device of reader near field transmission (being nfc card in the present embodiment), customer equipment is communicated by the impedance of modulating antenna 1, and this customer equipment refers to NFC device: be the SD card of NFC function or the SIM card of NFC function in the present embodiment.
Digital transmission system 31 is for detecting the signal that receives and being converted to the information coding expression-form of S2C form or other equivalences.The inlet circuit of this digital transmission system 31 connects the circuit of fore device, and this fore device can be main frame, reader or nfc card.Its receiving front-end device transfers to the signal of digital transmission system 31, and is converted into the information coding expression-form of S2C form or other equivalences, and is sent to modulation demodulation system 32.
Receiver 2 comprises the gain adjusting system 21, calibration circuit 22, signal amplitude detection system 23 and the phase locking circuit 24 that are connected with antenna 1 circuit respectively.
The size that gain adjusting system 21 controls to transmit for detecting the signal strength signal intensity obtained according to signal amplitude detection system 23, if signal strength signal intensity is larger, illustrate between card reader with nfc card more close, transmitting can be less.
The laser propagation effect that calibration system 22 reaches best for optimizing waveform, detects the electric current and voltage launched, computing impedance, maximizes the change of impedance.
Signal amplitude detection system 23 is for detecting the intensity of Received signal strength.
Phase locking circuit 24 is for obtaining the phase place of the carrier wave of card reader transmitting.
Active mini near field communication antenna system of the present invention uses carrier auxiliary (Phase synchronization) to control active transmission circuit 33, realized the effect of the impedance modulation of large antenna in prior art by this active transmission circuit 33, make undersized antenna 1 can realize producing the effect as large antenna-reflected.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (1)
1. an active mini near field communication antenna system, this system comprises antenna (1), and the receiver (2) be connected with described antenna (1) circuit respectively, and reflector (3); It is characterized in that, described reflector (3) comprises the active transmission circuit (33) be connected with described antenna (1) circuit, the modulation demodulation system (32) be connected with described active transmission circuit (33) circuit, and the digital transmission system (31) be connected with described modulation demodulation system (32) circuit;
Described antenna system is applicable to close range wireless communication; The length of described antenna (1) and be widely less than 3 centimetres is near-field coupling antenna; The carrier waveform that active transmission circuit (33) produces 13.56MHz or approximate frequency passes through antenna (1) wireless transmission to extraneous radio-frequency apparatus;
Described digital transmission system (31) detects and receives signal that fore device sends and be converted to S2C form and is sent to modulation demodulation system (32);
Described receiver (2) comprises the gain adjusting system (21), calibration circuit (22), signal amplitude detection system (23) and the phase locking circuit (24) that are connected with described antenna (1) circuit respectively;
The intensity of described signal amplitude detection system (23) detection Received signal strength, gain adjusting system (21) controls the size transmitted according to the signal strength signal intensity that signal amplitude detection system (23) detection obtains, when signal strength signal intensity is larger, illustrate between antenna system and the radio-frequency apparatus in the external world mutually close, transmit reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110380889.7A CN102523022B (en) | 2011-11-25 | 2011-11-25 | Active mini near field communication antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110380889.7A CN102523022B (en) | 2011-11-25 | 2011-11-25 | Active mini near field communication antenna system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102523022A CN102523022A (en) | 2012-06-27 |
| CN102523022B true CN102523022B (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110380889.7A Active CN102523022B (en) | 2011-11-25 | 2011-11-25 | Active mini near field communication antenna system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9438317B2 (en) * | 2014-12-19 | 2016-09-06 | Intel Corporation | Card detect architecture for near field communications |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261686B (en) * | 2008-03-21 | 2011-05-25 | 北京大学深圳研究生院 | Ultrahigh RF identification reader/writer and its signal receiving/transmission method |
| EP2315310A3 (en) * | 2008-04-15 | 2012-05-23 | Huber+Suhner AG | Surface-mountable antenna with waveguide connector function, communication system, adaptor and arrangement comprising the antenna device |
| EP2338238B1 (en) * | 2008-08-26 | 2016-03-16 | QUALCOMM Incorporated | Concurrent wireless power transmission and near-field communication |
| CN101369319A (en) * | 2008-10-14 | 2009-02-18 | 复旦大学 | Active radio frequency identification tag |
| SI22900A (en) * | 2008-10-30 | 2010-04-30 | Vinko Kunc | Procedure and circuit for transmitting and receiving radio waves by using the same antenna based on an oscillating circuit |
| CN102142868B (en) * | 2010-01-29 | 2015-02-25 | 国民技术股份有限公司 | Near field communication method and system |
| CN101945498B (en) * | 2009-07-06 | 2014-10-29 | 宏达国际电子股份有限公司 | Communication device and signal processing method |
| US20110059692A1 (en) * | 2009-09-08 | 2011-03-10 | Electronics And Telecommunications Research Institute | Communications device using near field |
| CN102194090B (en) * | 2010-03-15 | 2014-07-30 | 国民技术股份有限公司 | Card reader |
| CN102244530B (en) * | 2010-05-10 | 2013-12-18 | 国民技术股份有限公司 | Near field communication method and system |
| CN102130379B (en) * | 2011-03-18 | 2014-07-16 | 中兴通讯股份有限公司 | Miniature microstrip antenna |
| CN202406110U (en) * | 2011-11-25 | 2012-08-29 | 乐鑫信息科技（上海）有限公司 | Active mini-sized near field wireless communication antenna system |
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Address after: Room 403, No. 2966 Jinke Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 201203 Patentee after: Lexin Information Technology (Shanghai) Co., Ltd. Address before: Room 403, No. 2966 Jinke Road, Zhangjiang High-tech Park, Pudong New Area, Shanghai, 201203 Patentee before: Yue Xin information technology (Shanghai) Co., Ltd. |