CN104112912A - Parameter adjustment method for high-frequency reader-writer antenna applied in metal environment - Google Patents

Parameter adjustment method for high-frequency reader-writer antenna applied in metal environment Download PDF

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Publication number
CN104112912A
CN104112912A CN201310136399.1A CN201310136399A CN104112912A CN 104112912 A CN104112912 A CN 104112912A CN 201310136399 A CN201310136399 A CN 201310136399A CN 104112912 A CN104112912 A CN 104112912A
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China
Prior art keywords
antenna
resistance
parallel
high frequency
writing device
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CN201310136399.1A
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Chinese (zh)
Inventor
董通
纪清涛
顾校平
王维佳
于海洋
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Aisino Corp
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Aisino Corp
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Priority to CN201310136399.1A priority Critical patent/CN104112912A/en
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Abstract

The invention provides a parameter adjustment method of a high-frequency reader-writer antenna applied in the metal environment. The high-frequency reader-writer antenna comprises an antenna hardware interface, an antenna parameter debugging component and an antenna coil which are connected mutually through wires. The antenna parameter debugging component comprises a first capacitor bank, a second capacitor bank and a resistor bank. The first capacitor bank comprises a first fixed capacitor C1 and a first adjustable capacitor VC1 which are in parallel connection. The second capacitor bank comprises a second fixed capacitor C2 and a second adjustable capacitor VC2 which are in parallel connection. The resistor bank comprises a first resistor R1 and a second resistor R2 which are in parallel connection. The inductance value Li and the resistance value Ri of the antenna coil are obtained through measurement, and the parallel resistance of the R1 and R2 is calculated according to the Li and Ri. According to the high-frequency reader-writer antenna of the embodiments of the invention, the capacitance and resistance values of the antenna parameter debugging component can be adjusted according to environment parameters of different metal mechanisms so as to ensure that the high-frequency reader-writer antenna has good reading and writing ability in various metal environments.

Description

Be applied to the parameter regulation means of the high frequency reading and writing device antenna of metal environment
Technical field
The present invention relates to reading and writing device antenna technical field, relate in particular to a kind of parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment.
Background technology
Non-contact card read write line is by antenna transmission and received energy, thereby carries out reading and writing data with non-contact card.Antenna and read write line circuit board can be designed as integral type, use same circuit board to realize read-write capability, also can be designed as separate type, use independent antenna plate, depend on different practical service environments.
Under nonmetal environment, Antenna Design and parameter testing are comparatively easy, but under metal environment, because the multiple interference such as the reflection that metal material produces, conduction, antenna read-write card ability is affected, makes the good antenna of reading/writing distance originally after inserting metal environment, occur the situation that read-write card Distance Shortened even can not be read and write.
In the middle of much non-contact card equipment, in order to guarantee that the permanent good of equipment used, be necessary to use the metal materials such as aluminium, steel as device fabrication material, therefore, develop that a kind of in metal environment, to apply good high frequency reading and writing device antenna be very necessary.
Summary of the invention
The object of this invention is to provide a kind of parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment, to improve the literacy of high frequency reading and writing device antenna under metal environment.
A kind of parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment, described high frequency reading and writing device antenna comprises: antenna hardware interface, antenna parameter debugging unit and aerial coil, described antenna parameter debugging unit is connected with described antenna hardware interface, aerial coil by wire, described antenna parameter debugging unit comprises: the first capacitance group, the second capacitance group and resistor group, described the first capacitance group comprises the first fixed capacity C being connected in parallel 1, the first tunable capacitor VC 1, described the second capacitance group comprises the second fixed capacity C being connected in parallel 2, the second tunable capacitor VC 2, described resistor group comprises the first resistance R being connected in parallel 1with the second resistance R 2, described the second capacitance group and resistor group are in parallel, then connect with the first capacitance group, and described method specifically comprises:
Measure the inductance value L of described aerial coil iwith resistance value R i, according to described L iand R icalculate described R 1and R 2resistance in parallel be
Described f is antenna frequency of oscillation, and described Q is the quality factor of described high frequency read write line.
As seen from the above technical solution provided by the invention, the high frequency reading and writing device antenna equipment under metal environment of being applied to of the embodiment of the present invention by arranging antenna parameter debugging unit in high frequency reading and writing device antenna, can adjust electric capacity and the resistance value in antenna parameter debugging unit according to the environmental parameter of different metal mechanism, thereby guarantee that high frequency reading and writing device antenna all has good literacy under various metal environment, has solved existing high frequency reading and writing device antenna and in metal environment, has applied difficult problem.
Accompanying drawing explanation
Fig. 1, for a kind of structural representation that is applied to the high frequency reading and writing device antenna under metal environment that the embodiment of the present invention provides, comprising: antenna hardware interface 11, antenna parameter debugging unit 12 and aerial coil 13;
A kind of concrete structure schematic diagram that is applied to the high frequency reading and writing device antenna equipment under metal environment that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 is the PCB(PrintedCircuitBoard of the high frequency reading and writing device antenna equipment shown in Fig. 2, printed circuit board) design drawing;
A kind of concrete process chart that is applied to the parameter regulation means of the high frequency reading and writing device antenna under metal environment that Fig. 4 provides for the embodiment of the present invention.
Embodiment
The invention provides a kind of high frequency reading and writing device antenna being applied under metal environment, its structural representation as shown in Figure 1, comprise: antenna hardware interface, antenna parameter debugging unit and aerial coil, described antenna parameter debugging unit is connected with antenna hardware interface, aerial coil by wire, and described antenna parameter debugging unit can comprise fixed capacity, tunable capacitor and resistance.
Described aerial coil can be Copper Foil coil, and the size of aerial coil, according to concrete metal application structure, designs according to the requirement that meets reading/writing distance.
Described high frequency reading and writing device antenna can adopt PCB(PrintedCircuitBoard, printed circuit board) as antenna carrier, pcb board material can be selected 2mm thickness F R4 hard plate material, above-mentioned FR-4 is a kind of code name of flame resistant material grade, and the meaning of representative is resin material must can be from a kind of material specification of horizontal blanking through fired state.The material of the substrate of described pcb board can be the hard substrates such as resin, glass fibre, can be also the soft substrate plates such as polyimides or polyester film.The substrate of above-mentioned pcb board can be by printing Copper Foil, the technique such as gold-plated or zinc-plated completes.
Exemplary, this embodiment provides a kind of concrete structure schematic diagram that is applied to the high frequency reading and writing device antenna equipment under metal environment as shown in Figure 2, in Fig. 2, described antenna parameter debugging unit comprises: the first capacitance group, the second capacitance group and resistor group, described the first capacitance group comprises the first fixed capacity C being connected in parallel 1, the first tunable capacitor VC 1, described the second capacitance group comprises the second fixed capacity C being connected in parallel 2, the second tunable capacitor VC 2, described resistor group comprises the first resistance R being connected in parallel 1with the second resistance R 2.Described the second capacitance group and resistor group are in parallel, and then connect with the first capacitance group.
By A, the Copper Foil coil between 2 of B forms aerial coil.By adjusting the value of electric capacity and resistance, reach matching and debugging object, according to the environmental parameter of different metal mechanism, adjust the value of fixed capacity, tunable capacitor and resistance in antenna parameter debugging unit.The PCB design drawing that is applied to the high frequency reading and writing device antenna equipment under metal environment shown in Fig. 2 as shown in Figure 3.
Described antenna hardware interface can be coaxial line interface, and described coaxial line interface can be SMA(SubMiniature version A, micro-edition A type) interface or SMB(SubMiniature version B, micro-edition Type B) interface.Described coaxial line interface is connected with read write line by special-purpose coaxial line, described special-purpose coaxial line adopts straight weldering mode or interface mode to be connected with printed circuit board, above-mentioned special-purpose coaxial line can adopt the soft coaxial line of RG174 type, and the length of special-purpose coaxial line can be selected according to demand.
The application band that is applied to the high frequency reading and writing device antenna under metal environment of the embodiment of the present invention is generally 13.56MHz frequency range, and this high frequency reading and writing device antenna can be applied to RFID(Radio Frequency Identification, radio-frequency (RF) identification) technical field.
Above-mentioned high frequency reading and writing device antenna equipment can be applicable in the multiple metal structure that needs read-write card operation, and this metal structure includes but not limited to place the working methods such as card, transfer card, Folding card.
High frequency reading and writing device antenna based on shown in Fig. 2, a kind of parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment that this embodiment provides, concrete handling process as shown in Figure 4, comprises following treatment step:
Step 41, antenna hardware interface, antenna parameter debugging unit and aerial coil are connected to each other by wire, described antenna parameter debugging unit comprises fixed capacity, tunable capacitor and resistance.
As shown in Figure 2, described antenna parameter debugging unit comprises: the first capacitance group, the second capacitance group and resistor group, described the first capacitance group comprises the first fixed capacity C being connected in parallel 1, the first tunable capacitor VC 1, described the second capacitance group comprises the second fixed capacity C being connected in parallel 2, the second tunable capacitor VC 2, described resistor group comprises the first resistance R being connected in parallel 1with the second resistance R 2.Described the second capacitance group and resistor group are in parallel, and then connect with the first capacitance group.
By A, the Copper Foil coil between 2 of B forms aerial coil.By adjusting the value of electric capacity and resistance, reach matching and debugging object, according to the environmental parameter of different metal mechanism, adjust the value of fixed capacity, tunable capacitor and resistance in antenna parameter debugging unit.
Step 42, according to the environmental parameter of different metal mechanism, adjust the value of fixed capacity, tunable capacitor and resistance in antenna parameter debugging unit.
First by electric impedance analyzer or other instruments, recorded the inductance L of aerial coil iand resistance R i.By inductance L iand resistance R ican calculate antenna quality factor q
Q = 2 πf L i R i
In formula, f is antenna frequency of oscillation, such as, f=13.56MHz.
Conventionally, by the inductance L of initial antenna coil iand resistance R ithe Q value that value calculates is greater than 50, rule of thumb, considers the impact of tolerance and the temperature of element, in order to guarantee the correct transmission of data, the desired value of chosen in advance Q.In order to obtain good Q value, seal in resistor group R in parallel 1and R 2.R 1and R 2resistance in parallel be:
The desired value of above-mentioned Q can be 35.
The the first fixed capacity C that uses the first capacitance group to comprise to be connected in parallel 1, the first tunable capacitor VC 1comprise with the second capacitance group the second fixed capacity C being connected in parallel 2, the second tunable capacitor VC 2obtain good matched impedance.
According to described R 1and R 2resistance in parallel and described inductance L i, resistance R idetermine described C 1and VC 1capacitance sum:
C 1 + VC 1 = R 1 R 2 R 1 + R 2 + R i 50 4 π 2 f 2 L i
According to described antenna quality factor q, determine described R 1and R 2resistance in parallel, according to described R 1and R 2resistance in parallel and described inductance L i, resistance R idetermine C 2and VC 2capacitance sum
C 2 + VC 2 = 1 - R 1 R 2 R 1 + R 2 + R i 50 4 π 2 f 2 L i
This is desirable tuning parameter value.Conventionally can selective basis calculated value, first definite C that approaches ideal value 1, C 2and R 1initial value.Antenna performance is now not optimum performance.So on the basis of initial value, as required, add VC1, VC2 and R2, and test by adjusting instrument, revise VC1, the value of VC2 and R2, makes antenna performance can reach best.
First set based on experience value described R 1initial value, then according to described R 1and R 2resistance in parallel and described R 1initial value determine described R 2value; First set based on experience value described C 1initial value, then according to described C 1and VC 1capacitance sum, and described C 1initial value determine described VC 1value; First set based on experience value described C 2initial value, then according to described C 2and VC 2capacitance sum, and described C 2initial value determine described VC 2value.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the parts in the device in embodiment can be described and be distributed in the device of embodiment according to embodiment, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The parts of above-described embodiment can be merged into parts, also can further split into a plurality of subassemblies.
In sum, the high frequency reading and writing device antenna equipment under metal environment of being applied to of the embodiment of the present invention by arranging antenna parameter debugging unit in high frequency reading and writing device antenna, can adjust electric capacity and the resistance value in antenna parameter debugging unit according to the environmental parameter of different metal mechanism, thereby guarantee that high frequency reading and writing device antenna all has good literacy under various metal environment, applies difficult problem thereby solved existing high frequency reading and writing device antenna in metal environment.
The high frequency reading and writing device antenna equipment support user who is applied under metal environment of the embodiment of the present invention arranges different read-write card positions in antenna plate coaxial line expanded range, can be applied to the card of variety classes, diverse location to carry out reading and writing data.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (8)

1. a parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment, it is characterized in that, described high frequency reading and writing device antenna comprises: antenna hardware interface, antenna parameter debugging unit and aerial coil, described antenna parameter debugging unit is connected with described antenna hardware interface, aerial coil by wire, described antenna parameter debugging unit comprises: the first capacitance group, the second capacitance group and resistor group, described the first capacitance group comprises the first fixed capacity C being connected in parallel 1, the first tunable capacitor VC 1, described the second capacitance group comprises the second fixed capacity C being connected in parallel 2, the second tunable capacitor VC 2, described resistor group comprises the first resistance R being connected in parallel 1with the second resistance R 2, described the second capacitance group and resistor group are in parallel, then connect with the first capacitance group, and described method specifically comprises:
Measure the inductance value L of described aerial coil iwith resistance value R i, according to described L iand R icalculate described R 1and R 2resistance in parallel be
Described f is antenna frequency of oscillation, and described Q is the quality factor of described high frequency read write line.
2. the parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment according to claim 1, is characterized in that, the desired value of described Q is 35.
3. the parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment according to claim 1 and 2, is characterized in that, described method also comprises:
According to described R 1and R 2resistance in parallel and described inductance L i, resistance R idetermine described C 1and VC 1capacitance sum;
According to described R 1and R 2resistance in parallel and described inductance L i, resistance R idetermine C 2and VC 2capacitance sum.
4. the parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment according to claim 3, is characterized in that, described according to described R 1and R 2resistance in parallel and described inductance L i, resistance R idetermine described C 1and VC 1capacitance sum, comprising:
C 1 + VC 1 = R 1 R 2 R 1 + R 2 + R i 50 4 π 2 f 2 L i
5. the parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment according to claim 3, is characterized in that, described determines described R according to described antenna quality factor q 1and R 2resistance in parallel, according to described R 1and R 2resistance in parallel and described inductance L i, resistance R idetermine C 2and VC 2capacitance sum, comprising:
C 2 + VC 2 = 1 - R 1 R 2 R 1 + R 2 + R i 50 4 π 2 f 2 L i
6. the parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment according to claim 3, is characterized in that, described method also comprises:
First set based on experience value described R 1initial value, then according to described R 1and R 2resistance in parallel and described R 1initial value determine described R 2value.
7. the parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment according to claim 3, is characterized in that, described method also comprises:
First set based on experience value described C 1initial value, then according to described C 1and VC 1capacitance sum, and described C 1initial value determine described VC 1value.
8. the parameter regulation means that is applied to the high frequency reading and writing device antenna under metal environment according to claim 3, is characterized in that, described method also comprises:
First set based on experience value described C 2initial value, then according to described C 2and VC 2capacitance sum, and described C 2initial value determine described VC 2value.
CN201310136399.1A 2013-04-18 2013-04-18 Parameter adjustment method for high-frequency reader-writer antenna applied in metal environment Pending CN104112912A (en)

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CN107507656A (en) * 2017-06-30 2017-12-22 中广核核电运营有限公司 CRDM coil measurement system and methods
CN112543525A (en) * 2020-12-14 2021-03-23 湖南顶立科技有限公司 Self-adaptive frequency modulation method and system for medium-frequency induction heating furnace

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Publication number Priority date Publication date Assignee Title
CN107507656A (en) * 2017-06-30 2017-12-22 中广核核电运营有限公司 CRDM coil measurement system and methods
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CN112543525A (en) * 2020-12-14 2021-03-23 湖南顶立科技有限公司 Self-adaptive frequency modulation method and system for medium-frequency induction heating furnace

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