CN206638734U - A kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method - Google Patents
A kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method Download PDFInfo
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- CN206638734U CN206638734U CN201720100876.2U CN201720100876U CN206638734U CN 206638734 U CN206638734 U CN 206638734U CN 201720100876 U CN201720100876 U CN 201720100876U CN 206638734 U CN206638734 U CN 206638734U
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- frequency rfid
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Abstract
The utility model discloses a kind of device that ultrahigh frequency RFID chip impedance is tested using the resonance method, include ultrahigh frequency RFID chip, Network Analyzer, also comprising first coil, the second coil, tertiary coil, the first coil, the second coil can encapsulate same ultrahigh frequency RFID chip respectively；The tertiary coil electrically connects the Network Analyzer；Encapsulate the first coil of same ultrahigh frequency RFID chip, tertiary coil Mutual Inductance Coupling described in the second coil priority face.Method of the present utility model does not introduce Touch error and avoids the problem of Network Analyzer tests non-standard impedance inaccuracy, is widely used in the device using the resonance method test ultrahigh frequency RFID chip belt encapsulation impedance.
Description
Technical field
The utility model belongs to electronic technology field, is related to a kind of dress for testing the encapsulation impedance of ultrahigh frequency RFID chip belt
Put, more particularly to a kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method.
Background technology
Ultra-high frequency RFID technology can be applied to the various industries such as logistics, traffic, false proof, clothes.Compared to traditional high frequency
Technology, ultra-high frequency RFID technology, which has, reads the advantages of distance is remote, and anti-collision is strong.
In order to play RFID technique read apart from it is remote the advantages of, the impedance of usual ultra-high frequency antenna needs to be designed as chip impedance
Conjugation.Although chip manufacturer gives the impedance value of chip, because the characteristics of hyperfrequency, the impedance value to chip is encapsulated
Influence very big.A variety of packing forms, or even the production firm that same packing forms are different, it can all cause band encapsulation core
The impedance of piece is different, the design reference value provided not equal to chip manufacturer.It is therefore desirable to find calibration tape encapsulation chip impedance
Method.
In the prior art, generally use prevention at radio-frequency port is connected to the formal testing impedance for encapsulating chip both ends, but this
Sample, which is done, can cause at least two problems.First, the encapsulation general size of chip is very small (within area 1mm*1mm), connecting line
General size quite greatly (1cm*1cm ranks), can so cause the influence of the connecting line influence more parasitic than encapsulation also big, cause
Test crash.Secondly, the equipment for testing hyperfrequency impedance, such as Network Analyzer, it is often suitable only for testing 50 ohmages, partially
Testing impedance from 50 ohm is inaccurate, and the impedance value of ultrahigh frequency RFID chip is usually the multiple resistance of 20+j200 ohms
It is anti-, cause test crash.
The content of the invention
In view of the shortcomings of the prior art, the utility model is special proposes that one kind uses the resonance method test ultrahigh frequency RFID chip belt
The device of impedance is encapsulated, it can not only solve problems of the prior art, also with other many beneficial effects.
To reach above-mentioned purpose, the utility model takes following technical scheme, and one kind uses the resonance method test superelevation
Frequency RFID chip belts encapsulate the device of impedance, comprising ultrahigh frequency RFID chip, Network Analyzer, also comprising first coil, second
Coil, tertiary coil, the first coil, the second coil encapsulate same ultrahigh frequency RFID chip respectively；The tertiary coil
For high own resonance value coil, the Network Analyzer is electrically connected；The first coil first encapsulates ultrahigh frequency RFID chip and institute
Tertiary coil Mutual Inductance Coupling is stated, then, after the encapsulation for removing the first coil, second coil encapsulates same superelevation again
Frequency RFID chip and the tertiary coil Mutual Inductance Coupling.
The inductance value of above-mentioned first coil is L1, the inductance value of second coil is L2, and meet：L1>L2。
The coil inductance of above-mentioned tertiary coil is L3, and meet：L1*5>L3>L2/5。
The own resonance value of above-mentioned tertiary coil is ω3=2 π f3, and meet：f3>1.2GHz。
Above-mentioned tertiary coil electrically connects a port of the Network Analyzer, and the Network Analyzer is arranged to test
The pattern of s parameter absolute values；When described first coil, the second coil are respectively close to described tertiary coil mutual inductance, the net
The s parameter absolute values of network analyzer change therewith.
Operation principle of the present utility model is illustrated below：
Two coils, i.e. first coil and the second coil are made, the inductance value of the two coils is respectively L1And L2, there is L1>
L2.The inductance value of the two coils can use test or emulation mode to obtain, because the diameter of coil is usually several lis
Rice, so either test or emulation, is readily available right value.Then same encapsulation is used, by ultrahigh frequency RFID core
Piece is encapsulated on above-mentioned two coil.Chip impedance value is capacitive character, so foring LC resonance with inductive coil.
As for tertiary coil L3, its size and first coil L1, the second coil L2It is similar but usually empty around here
Define tertiary coil L3Own resonance value be frequency values that Network Analyzer measures that s parameter imaginary parts are 0, by tertiary coil L3Connect
The a port of Network Analyzer, Network Analyzer are arranged to test the pattern of s parameter absolute values.Again by first coil L1With
Three-winding L3Face, and make first coil L1Close to tertiary coil L3, can be on Network Analyzer, it was observed that s parameter absolute values
Curve, there is an obvious peak value, the frequency of this peak value is exactly coil L1Resonance value ω1=2 π f1, same mode of operation
The second coil L can be measured2Resonance value ω2=2 π f2。
Data Post is finally utilized, the real and imaginary parts of ultrahigh frequency RFID chip can be obtained.
Specifically, chip capacity value Cp
And chip-resistance value Rp
The calculation process of above-mentioned data processing is：
If the imaginary part negative value in parallel of chip is Xp
Wherein CpIt is chip parallel equivalent electric capacity.
The series connection imaginary part negative value of chip is XL
Wherein CLIt is chip-in series equivalent capacity.
Had according to series-parallel conversion relation
：
Testing available four values is：L1, L2, ω1, ω2
Wherein XL1=ω1L1, XL2=ω2L2
Then have
Here there are two unknown numbers, two equations
It can solve：
Due to above-mentioned technical proposal, the beneficial effects of the utility model are:Test is wireless test, coil L1With coil L2
Any other encapsulation is not introduced, line disturbs so avoiding directly caused by test.Also, network point has only been used in test
Frequency corresponding to the peak value of the s parameters of analyzer, and without using the exact value of s parameters, it is inaccurate to avoid non-50 ohm of tests
Problem；Other test device and step of the present utility model are easy to use, solve actual test difficulty.
Due to above-mentioned beneficial effect, the utility model is widely used in sealing using the resonance method test ultrahigh frequency RFID chip belt
In the device for filling impedance.
Brief description of the drawings
Fig. 1 is tertiary coil L of the present utility model3With first coil L1The schematic diagram of test；
Fig. 2 is the tertiary coil L of utility model3With the second coil L2The schematic diagram of test；
Fig. 3 is tertiary coil L in the utility model embodiment3With first coil L1Couple the s parameter absolute value curves measured
Figure；
Fig. 4 is tertiary coil L in the utility model embodiment3With the second coil L2Couple the s parameter absolute value curves measured
Figure.
Identifier declaration：1- first coils；The coils of 2- second；3- tertiary coils；4- Network Analyzers.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is described in further detail by way of examples.
Refer to the attached drawing 1-4, so that one of representative commercial chip of ultrahigh frequency RFID is Alien H3 chips as an example,
The impedance design reference value that datesheet is provided is 1500 ohm | | 0.85pF.Alien H3 chips are sealed in certain manufacturer
Dress.
A kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method, comprising ultrahigh frequency RFID chip,
Network Analyzer, also comprising two kinds of first coil, the second coil, tertiary coil coils, the first coil, the second coil difference
Encapsulate same ultrahigh frequency RFID chip；The tertiary coil electrically connects the Network Analyzer；Encapsulate same hyperfrequency
Tertiary coil Mutual Inductance Coupling described in the first coil of RFID chips, the second coil face.
Two kinds of coils of size, i.e. coil L are made first1With coil L2, L1=45nH, L2=35nH, the two values can lead to
Cross test to obtain, because coil L1With coil L2Size in Centimeter Level, so test is accurate；Secondly Network Analyzer is made to use
Tertiary coil L3.L is obtained after tested3=50nH, this coil L3With the parasitic capacitance resonance of its own, own resonance frequency is produced
Rate value.This resonance value should be more than 1.2GHz.Here L is defined3The own resonance value of coil is that Network Analyzer measures imaginary part
For 0 frequency values.For 900MHz ultrahigh frequency RFID chips, coil L3Own resonance value be ω3=2 π f3, f3It should be greater than
1.2GHz；Coil mutual inductance is recycled, tests the coil L of two microarray strips1And L2Resonance value.Specially：By coil L3Connect network
The a port of analyzer, Network Analyzer are arranged to test the pattern of s parameter absolute values.At this time, by first coil L1(or
Second coil L2) close to coil L3, as shown in Figure 1 and Figure 2.It should be noted that ultrahigh frequency RFID chip is encapsulated into line respectively
Turn coil L1(or coil L2) on, as coil L1(or coil L2) close to coil L3When, on Network Analyzer, it is observed that s
Parameter absolute value curvilinear motion, i.e., curve shown in Fig. 3, Fig. 4.
In Fig. 3, transverse axis is scan frequency, and from 0.7GHz to 1GHz, the longitudinal axis is s parameter absolute values, it can be seen that s parameters are exhausted
There is a minimum d1 to value, the data of minimum are 0.7498GHz.Here it is the coil L measured1Resonance value.
In Fig. 4, transverse axis is scan frequency, and from 0.7GHz to 1GHz, the longitudinal axis is s parameter absolute values, it can be seen that s parameters are exhausted
There is a minimum e1 to value, the data of minimum are 0.8521GHz.Here it is the coil L measured2Resonance value.
Data Post is finally utilized, obtains the real and imaginary parts of ultrahigh frequency RFID chip.
Chip capacity value
And chip-resistance value
Wherein, L1=45nH, L2=35nH, ω1=2 π * 0.7498GHz, ω1=2 π * 0.8521GHz
C can be obtained by substituting into formulap=0.981pF, Rp=1521.52ohm
Alien H3 chips are contrasted, the impedance design reference value that datesheet is provided is 1500 ohm | | 0.85pF, can be with
See that the chip impedance after encapsulation is had any different with the impedance design reference values that provide of datesheet really.Encapsulation introduces
21.52ohm resistance and 0.131pF electric capacity.
The present embodiment, a kind of specific situation is only gived, those skilled in the art can easily understand, to this
The local modification that embodiment is made, but the technical solution of the utility model and thinking are employed, should be in guarantor of the present utility model
In the range of shield, for example coil shape is changed to square, triangle or other shapes, or the multiple test coils of increase, group from circle
Be averaging into multiple data etc., in the scope of protection of the utility model.
Claims (5)
1. a kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method, includes ultrahigh frequency RFID chip, net
Network analyzer, it is characterised in that：Also comprising first coil, the second coil, tertiary coil, the first coil, the second coil point
Same ultrahigh frequency RFID chip is not encapsulated；The tertiary coil is high own resonance value coil, electrically connects the network analysis
Instrument；The first coil first encapsulates ultrahigh frequency RFID chip and the tertiary coil Mutual Inductance Coupling, then, removes the First Line
After the encapsulation of circle, second coil encapsulates same ultrahigh frequency RFID chip and the tertiary coil Mutual Inductance Coupling again.
2. a kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method according to claim 1, its
It is characterised by：The inductance value of the first coil is L1, the inductance value of second coil is L2, and meet：L1>L2。
3. a kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method according to claim 1, its
It is characterised by：The coil inductance of described tertiary coil is L3, and meet：L1*5>L3>L2/5。
4. a kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method according to claim 3, its
It is characterised by：The own resonance value of described tertiary coil is ω3=2 π f3, and meet：f3>1.2GHz。
5. a kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method according to claim 1, its
It is characterised by：Described tertiary coil electrically connects a port of the Network Analyzer, and the Network Analyzer is arranged to survey
Try the pattern of s parameter absolute values；It is described when described first coil, the second coil are respectively close to described tertiary coil mutual inductance
The s parameter absolute values of Network Analyzer change therewith.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720100876.2U CN206638734U (en) | 2017-01-24 | 2017-01-24 | A kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720100876.2U CN206638734U (en) | 2017-01-24 | 2017-01-24 | A kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method |
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| Publication Number | Publication Date |
|---|---|
| CN206638734U true CN206638734U (en) | 2017-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720100876.2U Active CN206638734U (en) | 2017-01-24 | 2017-01-24 | A kind of device that the encapsulation impedance of ultrahigh frequency RFID chip belt is tested using the resonance method |
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| Country | Link |
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| CN (1) | CN206638734U (en) |
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2017
- 2017-01-24 CN CN201720100876.2U patent/CN206638734U/en active Active
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