CN207624014U - The structure of raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer - Google Patents
The structure of raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer Download PDFInfo
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- CN207624014U CN207624014U CN201820020135.8U CN201820020135U CN207624014U CN 207624014 U CN207624014 U CN 207624014U CN 201820020135 U CN201820020135 U CN 201820020135U CN 207624014 U CN207624014 U CN 207624014U
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Abstract
The structure for the raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer that the utility model discloses a kind of, including R2000 ultrahigh frequency reader-writer chips, coupler and PA；First stitch of the coupler is connect with the R2000 by receiving line, and the second stitch of the coupler is eliminated line by carrier wave with the R2000 and connect；The R2000 is connect with the PA by the first emission lines, and the PA is connect with the third stitch of the coupler by the second emission lines；The PA is located at the coupler lower left, the R2000 is located at the coupler lower right, the coupler axis is with the PA axis at 45 degree, the approximate equilateral triangle of formation after the coupler geometric center point, the R2000 geometric center points connect two-by-two with the PA geometric center points, such position relationship is by R2000, connection line length between coupler and PA is most short, to reduce power loss, enhances the signal transmitting and receiving performance of antenna.
Description
Technical field
The utility model belongs to ultrahigh radio frequency circuit optimization field, and in particular to a kind of raising based on ultrahigh frequency reader-writer
The structure of radio-frequency receiving-transmitting performance.
Background technology
Ultrahigh frequency reader-writer is a kind of to be kept in conjunction with proprietary efficient signal Processing Algorithm using Radio Frequency Identification Technology
While height identification, realize and the fast reading and writing of electronic tag handled, can be applied to logistics, gate inhibition, anti-fake, unmanned retail and
A variety of radio frequency identification systems such as production process control；
With being widely used for ultrahigh frequency reader-writer, people to the signal transmitting and receiving performance requirement of ultrahigh frequency reader-writer increasingly
Height, traditional ultrahigh frequency reader-writer reading distance is not remote enough, cannot meet the requirement of application system；In the prior art, application number
A kind of hyperfrequency multiple-limb antenna long-distance reader is disclosed in 201420004313.X, is mounted by a reader multiple
The ability of the method enhancing antenna of antenna sent and received signal, but this method is limited by hardware performance.
Utility model content
Shortcoming present in view of the above technology, the utility model provide a kind of base from the aspect of circuit layout
In the structure of the raising radio-frequency receiving-transmitting performance of ultrahigh frequency reader-writer, the position relationship by changing element in circuit reduces power damage
Consumption, improves the transmitting-receiving performance of aerial signal.
To achieve the goals above, the utility model provides a kind of raising radio frequency receipts based on ultrahigh frequency reader-writer chip
The structure of volatility, including R2000 ultrahigh frequency reader-writer chips, coupler and PA;First stitch of the coupler with it is described
R2000 ultrahigh frequency reader-writers chip is read and write by receiving line connection, the second stitch of the coupler with the R2000 hyperfrequencies
Device chip eliminates line connection by carrier wave；The R2000 ultrahigh frequency reader-writers chip is connect with the PA by the first emission lines,
The PA is connect with the third stitch of the coupler by the second emission lines；
The PA is located at the coupler lower left, and the R2000 ultrahigh frequency reader-writers chip is located at the coupler right side
Lower section, the coupler axis with the PA axis at 45 degree, read by the coupler geometric center point, the R2000 hyperfrequencies
It writes after device chip geometric center point is connect two-by-two with the PA geometric center points and forms equilateral triangle.
Wherein, second emission lines are parallel with the PA axis.
Wherein, the line that receives eliminates " L " shape of line in obtuse angle with the carrier wave of crossing.
Wherein, the R2000 ultrahigh frequency reader-writers chip transmits a signal to the PA by first emission lines.
Wherein, the PA transmits a signal to the coupler by the second emission lines.
Wherein, the 4th stitch of the coupler is connect with antenna, transmitting and reception signal.
The utility model has the beneficial effects that：Compared with prior art, PA is located at coupler lower left, and R2000 is located at coupling
Clutch lower right, coupler axis and PA axis are at 45 degree, coupler geometric center point, R2000 geometric center points and PA geometry
Central point forms equilateral triangle after connecting two-by-two, such position relationship is by R2000, the connecting line between coupler and PA
Length is most short, to reduce power loss, enhances the signal transmitting and receiving performance of antenna.
Description of the drawings
Fig. 1 is each position of components relation schematic diagram in the utility model circuit board；
Fig. 2 is the utility model coupler structure schematic diagram；
Fig. 3 is that the utility model signal receives and emit schematic diagram.
Main element symbol description
1, coupler 2, PA
3, R2000 ultrahigh frequency reader-writers chip 4, arm processor
5, host computer 6, antenna
11, the first stitch 12, the second stitch
13, third stitch 14, the 4th stitch
21, the second emission lines 23, the first emission lines
31, line 33 is received, carrier wave eliminates line.
Specific implementation mode
In order to more clearly state the utility model, the utility model is further described below in conjunction with the accompanying drawings.
Please refer to 1, a kind of structure of the raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer, including R2000 hyperfrequencies
Reader chip 3, coupler 1 and PA2;First stitch 11 of coupler 1 passes through reception with R2000 ultrahigh frequency reader-writers chip 3
Line 31 connects, and the second stitch 12 of coupler 1 is eliminated line 33 by carrier wave with R2000 ultrahigh frequency reader-writers chip 3 and connect；
R2000 ultrahigh frequency reader-writers chip 3 is connect with PA2 by the first emission lines 23, and the third stitch 13 of PA2 and coupler 1 pass through
Second emission lines 21 connect；PA2 is located at 1 lower left of coupler, and R2000 ultrahigh frequency reader-writers chip 3 is located at 1 bottom right of coupler
Side, 1 axis of coupler and PA2 axis are at 45 degree, in 1 geometric center point of coupler, 3 geometry of R2000 ultrahigh frequency reader-writers chip
Heart point forms equilateral triangle after being connect two-by-two with PA2 geometric center points.
Referring to Fig. 2, ultrahigh frequency reader-writer includes R2000 ultrahigh frequency reader-writers chip 3, PA2, coupler 1 and ARM processing
Device 4；Signal receive process：Antenna 6 will receive signal and is transferred directly to coupler 1 first, and secondly, coupler 1 is by receiving line
31 will receive signal transmission to R2000 ultrahigh frequency reader-writers chip 3, between coupler 1 and R2000 ultrahigh frequency reader-writers chip 3
It is also associated with carrier wave and eliminates line 33, supporting principle using waveform prevents from revealing except reception signal, again, R2000 ultrahigh frequency reader-writers
Arm processor 4 is transmitted a signal to after 3 modulated signal of chip, last arm processor 4 is back to host computer 5 by data are received；
Signal emission process：Host computer 5 sends instructions to arm processor 4 first, and secondly, arm processor 4 will transmitting according to instruction
Signal transmission is to R2000 ultrahigh frequency reader-writers chip 3, and again, R2000 ultrahigh frequency reader-writers chip 3 passes through the first emission lines 23
Signal transmission will be emitted to PA2, finally, PA2 will emit is transmitted to coupler 1 after signal amplifies by the second emission lines 21, most
Coupler 1 is sent out signal transmission to antenna 6 is emitted afterwards.
In the present embodiment, the second 21 lines of transmitting are parallel with PA2 axis, receive line 31 with carrier wave is crossed and eliminate line 33 in obtuse angle
" L " shape, due to ultrahigh frequency reader-writer circuit board reverse side have device punched to front, if stretching line, it is possible to can encounter
Via causes short circuit, therefore cabling mode makes the connection line length for transmitting signal most short in this way；In ultrahigh frequency reader-writer circuit
There is following relationship：
d2U(z)/dz2=(R1+jwL1)(G1+jwC1)U(z)=y2U(z)
d2I(z)/dz2=(R1+jwL1)(G1+jwC1)I(z)=y2I(z)
y=[(R1+jwL1)(G1+jwC1)]1/2=a+jb
Wherein, z is the connection line length for transmitting signal, and U (z), I (z) are respectively function of the voltage and current about z, R1
For resistance, L1For inductance, G1For admittance, C1For capacitance；W is angular frequency, and y is propagation constant, and a is attenuation constant, and b is that phase is normal
Number, j indicate imaginary number；It can show that transmission line with attenuation constant a, is successively decreased according to track lengths with index speed by upper formula, therefore
Cabling is longer, and decaying is bigger；So the loss that the connection line length for reducing transmission signal can reduce output power increases antenna spirit
Sensitivity；By taking frequency in ultrahigh frequency reader-writer is 920MHZ signals as an example, following table is obtained by experiment：
The improvement of 1 ultrahigh frequency reader-writer of table is front and back to receive transmission power contrast table
| Receiving sensitivity | Transmission power | Individual tag recognition distance | Multi-tag recognition performance（Test label 500 is opened） | |
| Before improvement | -84dbm | 29.5dbm | 7 meters | Identification 435 in 5s |
| After improvement | -85dbm | 30dbm | 7.8 rice | Identification 465 in 5s |
From table 1：
1,0.5db can be reduced by reaching the loss of antenna end transmission power；
2, the high 0.5db of reader receiving sensitivity；
3, farthest Card Reader distance increases by 10%；
4, multi-tag recognition performance improves 8%.
The advantage of the utility model is：
1, PA is located at coupler lower left, and R2000 is located at coupler lower right, coupler axis with PA axis at 45 degree,
Coupler geometric center point, R2000 geometric center points form equilateral triangle after being connect two-by-two with PA geometric center points, such
For position relationship by R2000, the connection line length between coupler and PA is most short, to reduce power loss, enhances antenna
Signal transmitting and receiving performance；
2, the second stitch of coupler is eliminated line by carrier wave with R2000 and is connect, and can remove carrier wave leakage, improves spirit
Sensitivity.
Disclosed above is only several specific embodiments of the utility model, but the utility model is not limited to this,
The changes that any person skilled in the art can think of should all fall into the scope of protection of the utility model.
Claims (6)
1. a kind of structure of the raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer, which is characterized in that including R2000 hyperfrequencies
Reader chip, coupler and PA;First stitch of the coupler passes through reception with the R2000 ultrahigh frequency reader-writers chip
Line connects, and the second stitch of the coupler is eliminated line by carrier wave with the R2000 ultrahigh frequency reader-writers chip and connect；It is described
R2000 ultrahigh frequency reader-writers chip is connect with the PA by the first emission lines, the third stitch of the PA and the coupler
It is connected by the second emission lines；
The PA is located at the coupler lower left, and the R2000 ultrahigh frequency reader-writers chip is located at the coupler lower right,
The coupler axis and the PA axis are at 45 degree, the coupler geometric center point, the R2000 ultrahigh frequency reader-writers core
The approximate equilateral triangle of formation after piece geometric center point connects two-by-two with the PA geometric center points.
2. the structure of the raising radio-frequency receiving-transmitting performance according to claim 1 based on ultrahigh frequency reader-writer, which is characterized in that
Second emission lines are parallel with the PA axis.
3. the structure of the raising radio-frequency receiving-transmitting performance according to claim 1 based on ultrahigh frequency reader-writer, which is characterized in that
The line that receives eliminates " L " shape of line in obtuse angle with the carrier wave of crossing.
4. the structure of the raising radio-frequency receiving-transmitting performance according to claim 1 based on ultrahigh frequency reader-writer, which is characterized in that
The R2000 ultrahigh frequency reader-writers chip transmits a signal to the PA by first emission lines.
5. the structure of the raising radio-frequency receiving-transmitting performance according to claim 1 based on ultrahigh frequency reader-writer, which is characterized in that
The PA transmits a signal to the coupler by the second emission lines.
6. the structure of the raising radio-frequency receiving-transmitting performance according to claim 1 based on ultrahigh frequency reader-writer, which is characterized in that
4th stitch of the coupler is connect with antenna, transmitting and reception signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820020135.8U CN207624014U (en) | 2018-01-06 | 2018-01-06 | The structure of raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820020135.8U CN207624014U (en) | 2018-01-06 | 2018-01-06 | The structure of raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207624014U true CN207624014U (en) | 2018-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201820020135.8U Active CN207624014U (en) | 2018-01-06 | 2018-01-06 | The structure of raising radio-frequency receiving-transmitting performance based on ultrahigh frequency reader-writer |
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| Country | Link |
|---|---|
| CN (1) | CN207624014U (en) |
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2018
- 2018-01-06 CN CN201820020135.8U patent/CN207624014U/en active Active
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