CN103530678A - Antenna limiter of electronic tag in radio frequency identification system - Google Patents
Antenna limiter of electronic tag in radio frequency identification system Download PDFInfo
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- CN103530678A CN103530678A CN201210225643.7A CN201210225643A CN103530678A CN 103530678 A CN103530678 A CN 103530678A CN 201210225643 A CN201210225643 A CN 201210225643A CN 103530678 A CN103530678 A CN 103530678A
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Abstract
The invention discloses an antenna limiter of an electronic tag in a radio frequency identification system. The antenna limiter is composed of a first N-channel enhanced field effect transistor, a second N-channel enhanced field effect transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor and a second capacitor. The third resistor and the fourth resistor are connected in series and then are connected in parallel with the first capacitor so as to form a series-parallel circuit; and one end, provided with the third resistor, of the series-parallel circuit is connected with a circuit between the first resistor and the second resistor. Grid electrodes of the first N-channel enhanced field effect transistor and the second N-channel enhanced field effect transistor are connected with a circuit between the third resistor and the fourth resistor. One end, provided with the fifth resistor, of a series branch circuit of the second capacitor and the fifth resistor is connected with a circuit between the first resistor and the second resistor; and the other end is connected with a circuit between the third resistor and the fourth resistor. With the structure, when voltage limiting of the antenna is realized, the power is not influenced; and the antenna limiter can be operated conveniently.
Description
Technical field
The present invention relates to radio-frequency technique field, specifically the antenna limiter of electronic tag in radio-frequency recognition system.
Background technology
Radio-frequency (RF) identification is current application one of the most contactless Target Recognition, and it has the advantages such as noncontact, read-write is flexible, speed is fast, security is high, is therefore widely used in every field.Radio-frequency recognition system mainly comprises reader and electronic tag, the energy that electronic tag receives reader can be affected by the angle between operating distance and reader antenna, the voltage that electronic tag senses may be larger, so must there be independent modular circuit to realize amplitude limit, by limiting voltage within limits, breakdown to prevent receiving metal-oxide-semiconductor grid.The simplest directly measure of amplitude limit is to reduce coupling coefficient, people usually reduce coupling coefficient by the operating distance of adjustment reader and electronic tag or the input capacitance of adjustment electronic tag now, wherein, adopting the operating distance of adjustment reader and electronic tag is to be difficult to hold for operating personnel, and the method does not gear to actual circumstances; Change the input capacitance of electronic tag, be to change resonance frequency, reduce coupling coefficient, the power transmitting in electronic tag also can reduce, in large scale integrated circuit design, the realization of electric capacity can take larger chip area, and the parameter of electric capacity is floated relatively large.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of convenient operation to control, simple in structure, and when carrying out voltage amplitude limit, can not affect the antenna limiter of electronic tag in the radio-frequency recognition system of delivering power.
Object of the present invention is achieved through the following technical solutions: the antenna limiter of electronic tag in radio-frequency recognition system, comprise a N channel enhancement field effect transistor, the 2nd N channel enhancement field effect transistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity and the second electric capacity, the two ends of described the first resistance are connected with the second resistance with the drain electrode of a N channel enhancement field effect transistor respectively, the other end that the second resistance connects the first resistance terminal is relatively connected with the drain electrode of the 2nd N channel enhancement field effect transistor, the one N channel enhancement field effect transistor source electrode and the 2nd N channel enhancement field effect transistor source grounding, after described the 3rd resistance and the series connection of the 4th resistance, form connection in series-parallel circuit with the first Capacitance parallel connection, this connection in series-parallel circuit is provided with one end of the 3rd resistance and the connection between the first resistance and the second resistance, its other end ground connection, the connection of the grid of a described N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor all and between the 3rd resistance and the 4th resistance, described the second electric capacity is connected with the 5th resistance, and the series arm of the second electric capacity and the 5th resistance is provided with one end of the 5th resistance and the connection between the first resistance and the second resistance, the connection between its other end and the 3rd resistance and the 4th resistance.
On circuit between described the first resistance and N channel enhancement field effect transistor drain electrode, be connected with the first antenna signal input part, on the circuit between the second resistance and the drain electrode of the 2nd N channel enhancement field effect transistor, be connected with the second antenna signal input part.The present invention, by the first antenna signal input part and the second antenna signal input part are set, is convenient to and external antenna.
Described the first resistance, the second resistance and the 3rd resistance are adjustable resistance.The present invention can be by the resistance of the first resistance, the second resistance and the 3rd resistance is regulated and controled to change limiting voltage of the present invention, thereby easy to operate while making the present invention change limiting voltage.
The present invention is when application, the first resistance, the second resistance and the first electric capacity are used for the radiofrequency signal of sampling, on the 3rd resistance and the 4th resistance, form with reference to controlling voltage, the one N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor are leak-off pipe, and a N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor are connected in parallel on antenna ends and carry out amplitude limit shunting.When the signal of sampling is during higher than datum, the electric current of the 4th resistance of flowing through increases, therefore the current potential of controlling a N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor grid improves, increase the ducting capacity of a N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor, the electric current of the N channel enhancement field effect transistor of flowing through and the 2nd N channel enhancement field effect transistor increases, reduce the service load of label antenna, thus the voltage amplitude of restriction aerial signal.The connection in series-parallel circuit that in the present invention, the 3rd resistance, the 4th resistance and the first electric capacity form is low-pass filtering loop, it changes and produces reaction low frequency signal, this low-pass filtering circuit feedback is adjusted the conducting degree of a N channel enhancement field effect transistor and the 2nd N channel enhancement field effect transistor, thereby while guaranteeing that the present invention applies, voltage is stable; The 5th resistance and the second electric capacity form high pass path, and rapid reflection is made in its sudden change to received signal, with this, increases amplitude limit ability.
Compared with prior art, the present invention has following beneficial effect: the present invention includes a N channel enhancement field effect transistor, the 2nd N channel enhancement field effect transistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity and the second electric capacity, the present invention uses the quantity of electronic component few, one-piece construction is simple, while being integrated in module, volume is little, be convenient to realize, cost is low, and the present invention passes through to improve the grid voltage of a N channel enhancement field effect transistor and the second enhancement mode field effect transistor when application, can not exert an influence to power, at input voltage, make divided circuit conducting in parallel during higher than certain voltage value, make the electric current of circuit become large, thereby make voltage voltage stabilizing in certain scope.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
In accompanying drawing, the corresponding name of Reference numeral is called: N1-one N channel enhancement field effect transistor, N2-two N channel enhancement field effect transistor, C1-the first electric capacity, C2-the second electric capacity, R1-the first resistance, R2-the second resistance, R3-three resistance, R4-four resistance, R5-five resistance, Ant1-the first antenna signal input part, Ant2-the second antenna signal input part.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment:
As shown in Figure 1, the antenna limiter of electronic tag in radio-frequency recognition system, comprise the shell shared with other parts of electronic tag, and setting internal circuit in the enclosure, wherein, internal circuit comprises a N channel enhancement field effect transistor N1, the 2nd N channel enhancement field effect transistor N2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first capacitor C 1 and the second capacitor C 2, for the ease of the limiting voltage to antenna, regulate and control, the first resistance R 1, the second resistance R 2 and the 3rd resistance R 3 are adjustable resistance.The two ends of the first resistance R 1 are connected with the second resistance R 2 with the drain electrode of a N channel enhancement field effect transistor N1 respectively, the other end that the second resistance R 2 connects the first resistance R 1 end is relatively connected with the drain electrode of the 2nd N channel enhancement field effect transistor N2, a N channel enhancement field effect transistor N1 source electrode and the 2nd N channel enhancement field effect transistor N2 source grounding.After the 3rd resistance R 3 and the 4th resistance R 4 series connection, with the first capacitor C 1 formation in parallel connection in series-parallel circuit, this connection in series-parallel circuit is provided with one end of the 3rd resistance R 3 and the connection between the first resistance R 1 and the second resistance R 2, its other end ground connection.The connection of the grid of the one N channel enhancement field effect transistor N1 and the 2nd N channel enhancement field effect transistor N2 all and between the 3rd resistance R 3 and the 4th resistance R 4.The second capacitor C 2 is connected with the 5th resistance R 5, the series arm of the second capacitor C 2 and the 5th resistance R 5 is provided with one end of the 5th resistance R 5 and the connection between the first resistance R 1 and the second resistance R 2, the connection between its other end and the 3rd resistance R 3 and the 4th resistance R 4.
For the ease of external antenna, on circuit between the first resistance R 1 and N channel enhancement field effect transistor N1 drain electrode, be connected with the first antenna signal input part Ant1, on the circuit between the second resistance R 2 and the 2nd N channel enhancement field effect transistor N2 drain electrode, be connected with the second antenna signal input part Ant2.
As mentioned above, can well realize the present invention.
Claims (3)
1. the antenna limiter of electronic tag in radio-frequency recognition system, it is characterized in that: comprise a N channel enhancement field effect transistor (N1), the 2nd N channel enhancement field effect transistor (N2), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the first electric capacity (C1) and the second electric capacity (C2), the two ends of described the first resistance (R1) are connected with the second resistance (R2) with the drain electrode of a N channel enhancement field effect transistor (N1) respectively, the other end that the second resistance (R2) connects the first resistance (R1) end is relatively connected with the drain electrode of the 2nd N channel enhancement field effect transistor (N2), the one N channel enhancement field effect transistor (N1) source electrode and the 2nd N channel enhancement field effect transistor (N2) source grounding, after the series connection of described the 3rd resistance (R3) and the 4th resistance (R4) with the first electric capacity (C1) formation in parallel connection in series-parallel circuit, this connection in series-parallel circuit is provided with one end of the 3rd resistance (R3) and the connection between the first resistance (R1) and the second resistance (R2), its other end ground connection, a described N channel enhancement field effect transistor (N1) and the connection of the 2nd both grids of N channel enhancement field effect transistor (N2) all and between the 3rd resistance (R3) and the 4th resistance (R4), described the second electric capacity (C2) is connected with the 5th resistance (R5), the series arm of the second electric capacity (C2) and the 5th resistance (R5) is provided with one end of the 5th resistance (R5) and the connection between the first resistance (R1) and the second resistance (R2), the connection between its other end and the 3rd resistance (R3) and the 4th resistance (R4).
2. the antenna limiter of electronic tag in radio-frequency recognition system according to claim 1, it is characterized in that: on the circuit between described the first resistance (R1) and a N channel enhancement field effect transistor (N1) drain electrode, be connected with the first antenna signal input part (Ant1), on the circuit between the second resistance (R2) and the drain electrode of the 2nd N channel enhancement field effect transistor (N2), be connected with the second antenna signal input part (Ant2).
3. the antenna limiter of electronic tag in radio-frequency recognition system according to claim 1 and 2, is characterized in that: described the first resistance (R1), the second resistance (R2) and the 3rd resistance (R3) are adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210225643.7A CN103530678A (en) | 2012-07-03 | 2012-07-03 | Antenna limiter of electronic tag in radio frequency identification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210225643.7A CN103530678A (en) | 2012-07-03 | 2012-07-03 | Antenna limiter of electronic tag in radio frequency identification system |
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| Publication Number | Publication Date |
|---|---|
| CN103530678A true CN103530678A (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210225643.7A Pending CN103530678A (en) | 2012-07-03 | 2012-07-03 | Antenna limiter of electronic tag in radio frequency identification system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040036576A1 (en) * | 1998-09-17 | 2004-02-26 | Intermec Ip Corp | Reference circuit enhancement for passive RFID tags |
| CN102244502A (en) * | 2011-04-25 | 2011-11-16 | 胡建国 | Automatic Q value adjustment amplitude limiting circuit |
| CN202632348U (en) * | 2012-07-03 | 2012-12-26 | 成都市宏山科技有限公司 | Antenna limiter of electronic tag of radio frequency identification system |
-
2012
- 2012-07-03 CN CN201210225643.7A patent/CN103530678A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040036576A1 (en) * | 1998-09-17 | 2004-02-26 | Intermec Ip Corp | Reference circuit enhancement for passive RFID tags |
| CN102244502A (en) * | 2011-04-25 | 2011-11-16 | 胡建国 | Automatic Q value adjustment amplitude limiting circuit |
| CN202632348U (en) * | 2012-07-03 | 2012-12-26 | 成都市宏山科技有限公司 | Antenna limiter of electronic tag of radio frequency identification system |
Non-Patent Citations (1)
| Title |
|---|
| 位召勤: "《电子标签芯片射频接口电路研究与设计》", 《中国优秀硕士学位论文全文数据库》, no. 6, 31 December 2007 (2007-12-31) * |
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Application publication date: 20140122 |