CN101329717A - Radio frequency card reader for controlling signal transmit-receive strength by stages and implementing method thereof - Google Patents
Radio frequency card reader for controlling signal transmit-receive strength by stages and implementing method thereof Download PDFInfo
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- CN101329717A CN101329717A CNA200810067448XA CN200810067448A CN101329717A CN 101329717 A CN101329717 A CN 101329717A CN A200810067448X A CNA200810067448X A CN A200810067448XA CN 200810067448 A CN200810067448 A CN 200810067448A CN 101329717 A CN101329717 A CN 101329717A
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Abstract
The invention relates to a radio frequency card reader which controls the transceiver strength of the signal thereof by stages and an implementation method thereof; the radio frequency card reader (100) consists of a micro-controller (MCU) (110), a radio frequency transceiver antenna (150) and a radio frequency transceiver module (Transceiver) (120). A radio frequency signal strength selection module (160) is in series connection between the radio frequency transceiver module (Transceiver) (120) and the radio frequency transceiver antenna (150); in the identification stage of the communication between the radio frequency SIM card and the radio frequency card reader, the micro-controller (MCU) (110) controls the strength of the radio frequency signal strength selection module (160) to attenuate the radio frequency signal between the radio frequency card reader and the radio frequency SIM card; during the data communication stage, the micro-controller (MCU) (110) controls the strength of the radio frequency signal strength selection module (160) to maintain the normal strength of the radio frequency signal and communicate with radio frequency SIM. The radio frequency card reader and the implementation method not only limit the effective communication distance between a mobile communication terminal and the card reader in a reasonable scope, but also improve the reliability of short distance communication quality between the mobile communication terminal and the card reader.
Description
Technical field
The present invention relates to and be built in the matching used radio-frequency card reader of radio-frequency SIM card of mobile communication terminal and the control method of signal intensity thereof, particularly be related to the method for the signal intensity that improves radio-frequency SIM card short-range communication quality and control radio-frequency card reader stage by stage and use the radio-frequency card reader of this method.
Background technology
The subscriber identity module Subscriber Identity Model card of existing mobile communication system is called for short SIM card, is widely used as the customer identification device of mobile communication terminal.Along with scientific technological advance, in the SIM card card body of common mobile communication terminal, increase various smart circuit modules by the whole bag of tricks, make SIM card through described transformation except basic SIM card function is arranged, also have other to be close to the function of life more, radio-frequency SIM card is exactly an example wherein.Described radio-frequency SIM card is by transforming original SIM card of mobile communication terminal, the interface that carries out the short-distance wireless bidirectional data communication with outside other treating apparatus is set, legacy data by this wireless data communications interface and SIM card is handled and memory function, described radio-frequency SIM card becomes the mobile communication terminal SIM card that has the wireless radiofrequency communication function and have payment function concurrently, can make the mobile communication terminal that this radio-frequency SIM card is installed have concurrently such as credit card, the small amount payment card, the function of smart cards such as attendance card, and it can directly see on the mobile communication terminal screen with the information that produces in the card process, and needs the holder to finish operations by cell phone keyboard.
Described radio-frequency SIM card comprises the integrated circuit in card body and the card body.Be provided with on the described card body can with the interface of mobile phone SIM card seat coupling, integrated circuit in the described card comprises microcontroller MCU, the radio-frequency SIM card storer, radio-frequency (RF) receiving and transmission module Transceiver and the interface circuit that are electrically connected with this microcontroller MCU, and the radio-frequency receiving-transmitting antenna that is electrically connected with radio-frequency (RF) receiving and transmission module Transceiver.By the interface on interface circuit and the radio-frequency SIM card body, described radio-frequency SIM card is electrically connected with mobile communication terminal.Described radio-frequency SIM card can with mobile communication terminal address realizing the standard feature of conventional SIM card, also can communicate by letter with supporting peripheral data treating apparatus in short distance with the radio-frequency receiving-transmitting antenna simultaneously by radio-frequency (RF) receiving and transmission module Transceiver.Above-mentioned Content of Communication and process are specifically handled by the microcontroller MCU in this radio-frequency SIM card, described in case of necessity microcontroller MCU is by the data line on the mobile communication terminal SIM card seat, according to APDU standard agreement and mobile communication terminal address, thereby the SIM card development kit SIM Card Tool Kit by mobile communication terminal sends instruction to mobile communication terminal, controls the screen display and the keyboard input of this mobile communication terminal.Described radio-frequency SIM card storer can be arranged among the microcontroller MCU, makes microcontroller MCU and storer become an integral module; Described radio-frequency SIM card memory stores has international mobile subscriber identity International Mobile Subscriber Identification Number, is called for short IMSI; Also store the required information of other application function that realizes.Described radio-frequency receiving-transmitting antenna is tours antenna or dipole antenna or helical antenna or whip antenna.Described radio-frequency SIM card by radio-frequency (RF) receiving and transmission module Transceiver and radio-frequency receiving-transmitting antenna with communicate by letter as the radio-frequency card reader of peripheral data treating apparatus, finish function such as smart cards such as credit card, small amount payment card, attendance cards.
In actual life, described radio-frequency card reader has very high requirement to the reliability of mobile communication terminal short-range communication.The radio-frequency (RF) signal strength of described radio-frequency SIM card has determined the effective communication distance between mobile communication terminal and card reader.In order to limit described effective communication distance in the reasonable scope, avoiding occurring misreading the card phenomenon, prior art adopts the method for the radio-frequency (RF) signal strength of decay radio-frequency SIM card or the radio-frequency card reader supporting with it.But, through the sensitivity of the radio-frequency (RF) signal strength of overdamping near the card reader received RF signal, even card reader is operated in the ultimate limit state of received RF signal intensity, be easy to increase the bit error rate, reduced short-range communication quality and reliability thereof between mobile communication terminal and card reader.Therefore, need a kind of method and radio-frequency card reader, can improve short-range communication quality and reliability thereof between them again with the restriction of the effective communication distance between mobile communication terminal and card reader in the reasonable scope.
Summary of the invention
The technical problem to be solved in the present invention is to avoid the deficiencies in the prior art part and proposes a kind of its signal transmit-receive intensity radio-frequency card reader and its implementation of controlling stage by stage, can can improve the reliability of short-range communication between them again with the restriction of the effective communication distance between mobile communication terminal and card reader in the reasonable scope.
The communication process of prior art card reader and radio-frequency SIM card comprises cognitive phase and data communication phase.At communicate by letter with the radio-frequency SIM card cognitive phase of process of radio-frequency card reader, described radio-frequency card reader obtains and discerns the identity Identification of radio-frequency SIM card, is called for short ID; The characteristics in this stage are that data volume is little, by identification, between card reader and radio-frequency SIM card, set up radio communication and are connected radio-frequency SIM card, and be the easiest stage of misreading card.In communicate by letter with the radio-frequency SIM card data communication phase of process of radio-frequency card reader, setting up the wireless data communications of finishing between radio-frequency card reader that radio communication connects and the radio-frequency SIM card at concrete function; The characteristics in this stage are that data volume is bigger, communication reliability is required high, be connected owing between this stage radio-frequency SIM card and radio-frequency card reader, set up radio communication,, not influenced by other radio-frequency SIM card and cause and misread the card phenomenon even radio-frequency (RF) signal strength is high again.The present invention utilizes above-mentioned radio-frequency card reader and radio-frequency SIM card to realize goal of the invention in the cognitive phase and the data communication phase characteristics separately of communication process.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Implement a kind ofly to control its signal transmit-receive intensity stage by stage to improve radio-frequency SIM card short-range communication method for quality based on radio-frequency card reader, described radio-frequency card reader comprises microcontroller MCU and radio-frequency receiving-transmitting antenna, and the radio-frequency (RF) receiving and transmission module Transceiver, storer and the interface circuit that are electrically connected with this microcontroller MCU; Described radio-frequency card reader is finished and the communicating by letter of radio-frequency SIM card through cognitive phase and data communication phase under the control of microcontroller MCU; Especially, described method comprises the steps:
A. between described radio-frequency (RF) receiving and transmission module Transceiver and radio-frequency receiving-transmitting antenna, connect and be subjected to the radio-frequency (RF) signal strength of described microcontroller MCU control to select module.
B. the cognitive phase of communicating by letter with radio-frequency card reader at described radio-frequency SIM card, described microcontroller MCU control radio-frequency (RF) signal strength select module to decay radiofrequency signal that described radio-frequency card reader communicates by letter with radio-frequency SIM card, make it intensity and weaken, thereby the mobile communication terminal of described radio-frequency SIM card and the radio frequency communication distance between radio-frequency card reader have been installed in control;
C. the data communication phase of communicating by letter with card reader at described radio-frequency SIM card, described microcontroller MCU control radio-frequency (RF) signal strength selects module to keep normal radio-frequency (RF) signal strength to communicate by letter with radio-frequency SIM card.
Described radio-frequency (RF) signal strength selects module to comprise first radio-frequency (RF) switch, second radio-frequency (RF) switch and radiofrequency signal attenuation module; Described two radio-frequency (RF) switch all comprise moving contact, first stationary contact and second stationary contact separately; Described steps A also comprises step by step following:
A1. the moving contact with described first radio-frequency (RF) switch is electrically connected with radio-frequency (RF) receiving and transmission module Transceiver;
A2. the moving contact with described second radio-frequency (RF) switch is electrically connected with the radio-frequency receiving-transmitting antenna;
A3. described radiofrequency signal attenuation module is connected between two radio-frequency (RF) switch, first static electric shock separately;
A4. described two radio-frequency (RF) switch second stationary contact separately directly is electrically connected.
The present invention solve the technical problem can also be by realizing by the following technical solutions:
Design, a kind of radio-frequency card reader of controlling its signal transmit-receive intensity stage by stage of manufacturing comprise microcontroller MCU and radio-frequency receiving-transmitting antenna, and the radio-frequency (RF) receiving and transmission module Transceiver, storer and the interface circuit that are electrically connected with this microcontroller MCU; Described radio-frequency card reader is finished and the communicating by letter of radio-frequency SIM card through cognitive phase and data communication phase under the control of microcontroller MCU; Especially, comprise also being subjected to the radio-frequency (RF) signal strength of described microcontroller MCU control to select module that this radio-frequency (RF) signal strength selects module to be connected between described radio-frequency (RF) receiving and transmission module Transceiver and the radio-frequency antenna; At the cognitive phase that described radio-frequency SIM card is communicated by letter with radio-frequency card reader, described microcontroller MCU control radio-frequency (RF) signal strength select module to decay radio-frequency (RF) signal strength that described radio-frequency card reader communicates by letter with radio-frequency SIM card; In the data communication phase that described radio-frequency SIM card is communicated by letter with radio-frequency card reader, described microcontroller MCU control radio-frequency (RF) signal strength selects module to keep normal radio-frequency (RF) signal strength to communicate by letter with radio-frequency SIM card.
Described radio-frequency (RF) signal strength selects module to comprise first radio-frequency (RF) switch, second radio-frequency (RF) switch and radiofrequency signal attenuation module; Described two radio-frequency (RF) switch all comprise moving contact, first stationary contact and second stationary contact separately; The moving contact of described first radio-frequency (RF) switch is electrically connected with radio-frequency (RF) receiving and transmission module Transceiver; The moving contact of described second radio-frequency (RF) switch is electrically connected with the radio-frequency receiving-transmitting antenna; Described radiofrequency signal attenuation module is connected between two radio-frequency (RF) switch, first static electric shock separately; Described two radio-frequency (RF) switch second stationary contact separately directly is electrically connected.
In above-mentioned two technical schemes, the radiofrequency signal decay intensity of described radiofrequency signal attenuation module is adjustable.This radiofrequency signal attenuation module can be by changing wherein components and parts changing its electrical characteristic parameter, thereby adjust the decay intensity of described radiofrequency signal attenuation module to radiofrequency signal; In addition, described radiofrequency signal attenuation module can also be adjusted the decay intensity of radiofrequency signal under described microcontroller MCU control.Described two radio-frequency (RF) switch all are operated in ultrahigh frequency SHF frequency range, very high frequency(VHF) VHF frequency range or superfrequency uhf band.
Compare with prior art, the useful technique effect that the present invention " controls radio-frequency card reader and its implementation of its signal transmit-receive intensity " stage by stage is:
In the easiest identification stage that the card phenomenon occurs misreading, with the restriction of the effective communication distance between mobile communication terminal and radio-frequency card reader in the reasonable scope by described radiofrequency signal attenuation module; In data communication phase, radio-frequency (RF) signal strength is not decayed, to improve short-range communication quality and reliability thereof.Therefore, the present invention both, can improve short-range communication quality and reliability thereof between them again with the restriction of the effective communication distance between mobile communication terminal and radio-frequency card reader in the reasonable scope.
Description of drawings
Fig. 1 is the applied environment synoptic diagram of the present invention's described radio-frequency SIM card of " controlling radio-frequency card reader and its implementation of its signal transmit-receive intensity stage by stage " and radio-frequency card reader;
Fig. 2 is the electric principle schematic of the described radio-frequency card reader 100 of the preferred embodiment of the present invention;
Embodiment
Be described in further detail below in conjunction with preferred embodiment shown in the accompanying drawing.
The present invention relates to a kind ofly control its signal transmit-receive intensity stage by stage to improve radio-frequency SIM card short-range communication method for quality based on radio-frequency card reader, as depicted in figs. 1 and 2, described radio-frequency SIM card 300 is installed in the mobile communication terminal 200, described radio-frequency card reader 100 comprises microcontroller MCU 110 and radio-frequency receiving-transmitting antenna 150, and the radio-frequency (RF) receiving and transmission module Transceiver 120, storer 130 and the interface circuit 140 that are electrically connected with this microcontroller MCU 110; Described radio-frequency card reader 100 is finished and the communicating by letter of radio-frequency SIM card 300 through cognitive phase and data communication phase under the control of microcontroller MCU 110; Especially described method comprises the steps:
A. between described radio-frequency (RF) receiving and transmission module Transceiver 120 and radio-frequency receiving-transmitting antenna 150, connect and be subjected to the radio-frequency (RF) signal strength of described microcontroller MCU 110 controls to select module 160.
B. the cognitive phase of communicating by letter with radio-frequency card reader 100 at described radio-frequency SIM card 300, the radiofrequency signal that described microcontroller MCU 110 control radio-frequency (RF) signal strength select the described radio-frequency card reader 300 of module 160 decay to communicate by letter with radio-frequency SIM card 100, making it intensity weakens, thereby the mobile communication terminal of described radio-frequency SIM card and the radio frequency communication distance between radio-frequency card reader have been installed in control, make this radio frequency communication distance in reasonable range, to avoid occurring misreading the phenomenon of card;
C. the data communication phase of communicating by letter with radio-frequency card reader 100 at described radio-frequency SIM card 300, described microcontroller MCU110 control radio-frequency (RF) signal strength selects module 160 to keep normal radio-frequency (RF) signal strength to communicate by letter with radio-frequency SIM card 300.
The preferred embodiment of the present invention, as shown in Figure 2, described radio-frequency (RF) signal strength selects module 160 to comprise first radio-frequency (RF) switch 161, second radio-frequency (RF) switch 162 and radiofrequency signal attenuation module 163; Described radio-frequency (RF) switch is the device commonly used of prior art, for convenience, the present invention is with the symbolic principle of work of describing described radio-frequency (RF) switch of the form of common three-position switch, and promptly described two radio-frequency (RF) switch 161,162 all comprise moving contact o1, o2, the first sound point p1, p2 and the second stationary contact q1, q2 separately; For the radio-frequency (RF) switch of practical application, described moving contact, first stationary contact and second stationary contact are to realize by the respective pins of this radio-frequency (RF) switch or input/output end port.So, described steps A also comprises step by step following:
A1. the moving contact o1 with described first radio-frequency (RF) switch 161 is electrically connected with radio-frequency (RF) receiving and transmission module Transceiver120;
A2. the moving contact o2 with described second radio-frequency (RF) switch 162 is electrically connected with radio-frequency receiving-transmitting antenna 150;
A3. described radiofrequency signal attenuation module 163 is connected between two radio-frequency (RF) switch 161,162, the first static electric shock p1, the p2 separately;
A4. described two radio-frequency (RF) switch 161, the 162 second stationary contact q1, q2 separately directly is electrically connected, described two radio-frequency (RF) switch 161,162 control end ctrl separately are electrically connected with microcontroller MCU 110.
The invention still further relates to a kind of radio-frequency card reader 100 of controlling its signal transmit-receive intensity stage by stage, comprise microcontroller MCU110 and radio-frequency receiving-transmitting antenna 150, and the radio-frequency (RF) receiving and transmission module Transceiver 120, storer 130 and the interface circuit 140 that are electrically connected with this microcontroller MCU 110; Described radio-frequency card reader 100 is finished and the communicating by letter of radio-frequency SIM card 300 through cognitive phase and data communication phase under the control of microcontroller MCU 110; Especially, comprise also being subjected to the radio-frequency (RF) signal strength of described microcontroller MCU 110 controls to select module 160 that this radio-frequency (RF) signal strength selects module 160 to be connected between described radio-frequency (RF) receiving and transmission module Transceiver 120 and the radio-frequency antenna 150; At the cognitive phase that described radio-frequency SIM card 300 is communicated by letter with radio-frequency card reader 100, the radiofrequency signal that described microcontroller MCU 110 control radio-frequency (RF) signal strength select the described radio-frequency card reader 100 of module 160 decay to communicate by letter with radio-frequency SIM card 300 makes it to reduce intensity; In the data communication phase that described radio-frequency SIM card 300 is communicated by letter with radio-frequency card reader 100, described microcontroller MCU 110 control radio-frequency (RF) signal strength select module 160 to keep normal radio-frequency (RF) signal strength to communicate by letter with radio-frequency SIM card 300.
The preferred embodiment of the present invention, as shown in Figure 2, described radio-frequency (RF) signal strength selects module 160 to comprise first radio-frequency (RF) switch 161, second radio-frequency (RF) switch 162 and radiofrequency signal attenuation module 163; As indicated above, radio-frequency (RF) switch described herein also is to describe by symbol to limit its principle of work.Described two radio-frequency (RF) switch 161,162 all comprise moving contact o1, o2, the first stationary contact p1, p2 and the second stationary contact q1, q2 separately; The moving contact o1 of described first radio-frequency (RF) switch 161 is electrically connected with radio-frequency (RF) receiving and transmission module Transceiver 120; The moving contact o2 of described second radio-frequency (RF) switch 162 is electrically connected with radio-frequency receiving-transmitting antenna 150; Described radiofrequency signal attenuation module 163 is connected between two radio-frequency (RF) switch 161,162, the first static electric shock p1, the p2 separately; Described two radio-frequency (RF) switch 161, the 162 second stationary contact q1, q2 separately directly is electrically connected, and described two radio-frequency (RF) switch 161,162 control end ctrl separately are electrically connected with microcontroller MCU 110.
The radiofrequency signal decay intensity of described radiofrequency signal attenuation module 163 is adjustable.Described radiofrequency signal attenuation module 163 can be by changing wherein components and parts changing its electrical characteristic parameter, thereby adjust the decay intensity of 163 pairs of radiofrequency signals of described radiofrequency signal attenuation module.For example, described radiofrequency signal attenuation module 163 uses ∏ type resistor network to realize the radiofrequency signal decay, adjusts the decay intensity of radiofrequency signal if desired, only needs to change the resistance of ∏ type resistor network, change its resistance, can realize adjustment radio frequency signal attenuation intensity.The preferred embodiment of the present invention is achieved through the following technical solutions the adjustment of radiofrequency signal decay intensity, as shown in Figure 2, radiofrequency signal attenuation module 163 realizes that the control end ctrl of this radiofrequency signal attenuation module 163 is electrically connected with microcontroller MCU 110 to the adjustment of the decay intensity of radiofrequency signal under described microcontroller MCU 110 controls.
Two radio-frequency (RF) switch 161,162 of the present invention all are operated in ultrahigh frequency SHF frequency range, very high frequency(VHF) VHF frequency range or superfrequency uhf band.
When described radio-frequency card reader 100 carries out the Card Reader operation, the cognitive phase of communicating by letter with radio-frequency SIM card 300 at radio-frequency card reader 100, described microcontroller MCU 110 control first radio-frequency (RF) switch 161 and second radio-frequency (RF) switch 162 separately stationary contact o1, o2 and connect with the corresponding first moving contact p1, p2 respectively, selection has the path of radiofrequency signal attenuator 163, the radio-frequency (RF) signal strength that described radio-frequency card reader 100 sends weakens, thereby has limited the effective communication distance of mobile communication terminal 200 with radio-frequency card reader 100; At this cognitive phase, described radio-frequency card reader 100 obtains and discerns the identity ID of radio-frequency SIM card 300, is connected with the radio communication of 300 of radio-frequency SIM cards thereby set up radio-frequency card reader 100.Just enter data communication phase after between described radio-frequency card reader 100 and radio-frequency SIM card 300, setting up radio communication and being connected, described microcontroller MCU 110 control first radio-frequency (RF) switch 161 and second radio-frequency (RF) switch 162 separately stationary contact o1, o2 and connect with the corresponding second moving contact q1, q2 respectively, select radio-frequency (RF) receiving and transmission module Transceiver 120 and radio-frequency antenna 150 direct-connected paths, described radio-frequency (RF) signal strength is without decay, thus the quality and the reliability thereof of raising communication link; In this stage,, can not make other radio-frequency SIM card the card phenomenon occur misreading because data communication only can be carried out between radio-frequency SIM card that passes through identification and radio-frequency card reader.Therefore, the present invention both, can improve short-range communication quality and reliability thereof between them again with the restriction of the effective communication distance between mobile communication terminal and card reader in the reasonable scope.
Claims (8)
1. control its signal transmit-receive intensity stage by stage to improve radio-frequency SIM card short-range communication method for quality based on radio-frequency card reader for one kind, described radio-frequency card reader (100) comprises microcontroller MCU (110) and radio-frequency receiving-transmitting antenna (150), and the radio-frequency (RF) receiving and transmission module Transceiver (120) that is electrically connected with this microcontroller MCU (110), storer (130) and interface circuit (140); Described radio-frequency card reader is finished and the communicating by letter of radio-frequency SIM card (300) through cognitive phase and data communication phase under the control of microcontroller MCU (110); It is characterized in that described method comprises the steps:
A. between described radio-frequency (RF) receiving and transmission module Transceiver (120) and radio-frequency receiving-transmitting antenna (150), connect and be subjected to the radio-frequency (RF) signal strength of described microcontroller MCU (110) control to select module (160);
B. block the cognitive phase of communicating by letter at described radio-frequency SIM (300) with radio-frequency card reader (100), described microcontroller MCU (110) control radio-frequency (RF) signal strength select module (160) to decay radiofrequency signal that described radio-frequency card reader (100) communicates by letter with radio-frequency SIM card (300), make it intensity and weaken, thereby the mobile communication terminal of described radio-frequency SIM card (300) and the radio frequency communication distance between radio-frequency card reader (100) have been installed in control;
C. the data communication phase of communicating by letter with radio-frequency card reader (100) at described radio-frequency SIM card (300), described microcontroller MCU (110) control radio-frequency (RF) signal strength selects module (160) to keep normal radio-frequency (RF) signal strength to communicate by letter with radio-frequency SIM card (300).
2. according to claim 1ly control its signal transmit-receive intensity stage by stage to improve radio-frequency SIM card short-range communication method for quality, it is characterized in that based on radio-frequency card reader:
Described radio-frequency (RF) signal strength selects module (160) to comprise first radio-frequency (RF) switch (161), second radio-frequency (RF) switch (162) and radiofrequency signal attenuation module (163); Described two radio-frequency (RF) switch (161,162) all comprise moving contact (o1, o2), first stationary contact (p1, p2) and second stationary contact (q1, q2) separately; Described steps A also comprises step by step following:
A1. the moving contact (o1) with described first radio-frequency (RF) switch (161) is electrically connected with radio-frequency (RF) receiving and transmission module Transceiver (120);
A2. the moving contact (o2) with described second radio-frequency (RF) switch (162) is electrically connected with radio-frequency receiving-transmitting antenna (150);
A3. described radiofrequency signal attenuation module (163) is connected between two radio-frequency (RF) switch (161,162), first static electric shock (p1, p2) separately;
A4. described two radio-frequency (RF) switch (161,162) second stationary contact (q1, q2) separately directly is electrically connected.
3. according to claim 2ly control its signal transmit-receive intensity stage by stage to improve radio-frequency SIM card short-range communication method for quality, it is characterized in that based on radio-frequency card reader:
The radiofrequency signal decay intensity of described radiofrequency signal attenuation module (163) is adjustable.
According to claim described 2 control its signal transmit-receive intensity stage by stage to improve radio-frequency SIM card short-range communication method for quality based on radio-frequency card reader, it is characterized in that:
Described two radio-frequency (RF) switch (161,162) all are operated in ultrahigh frequency SHF frequency range, very high frequency(VHF) VHF frequency range or superfrequency uhf band.
5. radio-frequency card reader of controlling its signal transmit-receive intensity stage by stage, be used to improve radio-frequency SIM card short-range communication quality, comprise microcontroller MCU (110) and radio-frequency receiving-transmitting antenna (150), and the radio-frequency (RF) receiving and transmission module Transceiver (120) that is electrically connected with this microcontroller MCU (110), storer (130) and interface circuit (140); Described radio-frequency card reader (100) is finished and the communicating by letter of radio-frequency SIM card (300) through cognitive phase and data communication phase under the control of microcontroller MCU (110); It is characterized in that:
Also comprise being subjected to the radio-frequency (RF) signal strength of described microcontroller MCU (110) control to select module (160), this radio-frequency (RF) signal strength selects module (160) to be connected between described radio-frequency (RF) receiving and transmission module Transceiver (120) and the radio-frequency antenna (150);
The cognitive phase of communicating by letter with radio-frequency card reader (100) at described radio-frequency SIM card (300), described microcontroller MCU (110) control radio-frequency (RF) signal strength select module (160) to decay radiofrequency signal that described card reader (100) communicates by letter with radio-frequency SIM card (300) makes it to reduce intensity; In the data communication phase that described radio-frequency SIM card (300) is communicated by letter with radio-frequency card reader (100), described microcontroller MCU (110) control radio-frequency (RF) signal strength selects module (160) to keep normal radio-frequency (RF) signal strength to communicate by letter with radio-frequency SIM card (100).
6. the radio-frequency card reader of controlling its signal transmit-receive intensity stage by stage according to claim 5 is characterized in that:
Described radio-frequency (RF) signal strength selects module (160) to comprise first radio-frequency (RF) switch (161), second radio-frequency (RF) switch (162) and radiofrequency signal attenuation module (163); Described two radio-frequency (RF) switch (161,162) all comprise moving contact (o1, o2), first stationary contact (p1, p2) and second stationary contact (q1, q2) separately;
The moving contact (o1) of described first radio-frequency (RF) switch (161) is electrically connected with radio-frequency (RF) receiving and transmission module Transceiver (120); The moving contact (o2) of described second radio-frequency (RF) switch (162) is electrically connected with radio-frequency receiving-transmitting antenna (150); Described radiofrequency signal attenuation module (163) is connected between two radio-frequency (RF) switch (161,162), first static electric shock (p1, p2) separately; Described two radio-frequency (RF) switch (161,162) second stationary contact (q1, q2) separately directly is electrically connected.
7. the radio-frequency card reader of controlling its signal transmit-receive intensity stage by stage according to claim 6 is characterized in that:
The radiofrequency signal decay intensity of described radiofrequency signal attenuation module (163) is adjustable.
8. the radio-frequency card reader of controlling its signal transmit-receive intensity stage by stage according to claim 6 is characterized in that:
Described two radio-frequency (RF) switch (161,162) all are operated in ultrahigh frequency SHF frequency range, very high frequency(VHF) VHF frequency range or superfrequency uhf band.
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| CN200810067448XA CN101329717B (en) | 2008-05-19 | 2008-05-19 | Radio frequency card reader for controlling signal transmit-receive strength by stages and implementing method thereof |
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| CN102054152A (en) * | 2009-10-30 | 2011-05-11 | 中兴通讯股份有限公司 | Radio frequency identification (RFID) tag as well as radio-frequency gain control method and device thereof |
| CN102065171A (en) * | 2009-11-16 | 2011-05-18 | 东信和平智能卡股份有限公司 | Method and device for controlling communication distance of radio-frequency SIM card by using ultrasonic ranging |
| WO2011113216A1 (en) * | 2010-03-15 | 2011-09-22 | 国民技术股份有限公司 | Mobile radio frequency apparatus, radio frequency integrated circuit card and radio frequency memory card |
| WO2011120242A1 (en) * | 2010-04-02 | 2011-10-06 | 国民技术股份有限公司 | Method for judging distance threshold for radio frequency sim card to initiate transaction using low-frequency magnetism communication |
| CN102215071A (en) * | 2010-04-06 | 2011-10-12 | 国民技术股份有限公司 | Method and system for calibrating radio frequency subscriber identity module (SIM) card |
| CN101996301B (en) * | 2009-08-24 | 2012-10-03 | 国民技术股份有限公司 | Communication distance control method and radio frequency card reading device |
| CN102982586A (en) * | 2012-11-23 | 2013-03-20 | 深圳市中科南方科技发展有限公司 | Electronic attendance system used by students |
| CN103093164A (en) * | 2011-10-31 | 2013-05-08 | 深圳光启高等理工研究院 | Communication system and communication method between fixed-line telephones and between mobile terminal and fixed-line telephone |
| CN102034070B (en) * | 2009-09-28 | 2013-06-12 | 东信和平科技股份有限公司 | Method for controlling communication distance of radio-frequency intelligent card |
| CN106712734A (en) * | 2016-11-25 | 2017-05-24 | 中国科学院微电子研究所 | Automatic gain control device |
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2008
- 2008-05-19 CN CN200810067448XA patent/CN101329717B/en active Active
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