CN109470922A - A kind of high impedance radio frequency measuring device and method - Google Patents
A kind of high impedance radio frequency measuring device and method Download PDFInfo
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- CN109470922A CN109470922A CN201811332962.1A CN201811332962A CN109470922A CN 109470922 A CN109470922 A CN 109470922A CN 201811332962 A CN201811332962 A CN 201811332962A CN 109470922 A CN109470922 A CN 109470922A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention discloses a kind of high impedance radio frequency measuring devices, the signal output end of exciting signal source is connected to the signal input part of power splitter, one signal output end of power splitter is connected to the signal input part of directional coupler, another signal output end of power splitter is connected to a signal input part of range detector；The signal output end of directional coupler is connected to the first signal input part of impedance transformer, and impedance transformer is additionally provided with second signal input port, and second signal input port is used to connect with device under test and measurement accessory；The coupling port of directional coupler is connected to another signal input part of range detector, and the signal output end of range detector is connected to processor and display unit；Present invention greatly enhances the measuring accuracies of high resistant resistant to device, and construct simplified calibration algorithm, simplify receiver structure, reduce costs, and the system is enable to be widely applied in high impedance test.
Description
[technical field]
The invention belongs to radio-frequency measurement field more particularly to a kind of high impedance radio frequency measuring devices and method.
[background technique]
In most cases using 50 Europe as normal impedance in conventional radio frequency test system, including the normalization of Smith circle diagram
It also tends to when doing calculating analysis using 50 Europe impedances as standard.Meanwhile connecting cable is commonly also using 50 Europe as impedance.
When carrying out high impedance test, quality factor, the parallel equivalent in measurement LC resonance circuit for such as measuring inductance are humorous
Vibration impedance etc., impedance is often as high as 500 kilo-ohms.If tested with method for reflection, testing an impedance is 500 kilo-ohms
Its corresponding reflection coefficient of impedance is (500-0.05)/(500+0.05)=0.9998.And actually existing test reflection is
Several instruments is difficult accurately to test this value, causes test result error very big.Such as: if test result is 0.9996 (i.e.
Error is that 0.0002), then corresponding impedance is 250 kilo-ohms.Therefore measurement result loses meaning at this time.
In addition, conventional calibration algorithm needs to know phase information, in order to obtain phase information, test macro is when building
Time needs to do coherent processing.At this point, system needs exciting signal source and local oscillation signal source.Meanwhile in generally requiring to be down-converted to
Frequency is reprocessed, and quicklys increase the complexity of system, cost is substantially increased.
[summary of the invention]
The object of the present invention is to provide a kind of high impedance radio frequency measuring device and methods, when improving to high impedance test
The problem of measuring accuracy.
The invention adopts the following technical scheme: a kind of high impedance radio frequency measuring device, including exciting signal source, pumping signal
The signal output end in source is connected to the signal input part of power splitter, and a signal output end of power splitter is connected to directional coupler
Signal input part, another signal output end of power splitter is connected to a signal input part of range detector；
The signal output end of directional coupler is connected to the first signal input part of impedance transformer, and impedance transformer is also set
It is equipped with second signal input port, second signal input port is used to connect with device under test and measurement accessory；
The coupling port of directional coupler is connected to another signal input part of range detector, the letter of range detector
Number output end is connected to processor and display unit.
Preferably, measurement accessory is made of open device, short-circuiting device and load resistance.
Preferably, load resistance resistance value is 10k Ω.
Another technical solution of the invention: a kind of impedance detecting method of high impedance radio frequency device uses claim
A kind of above-mentioned high impedance radio frequency measuring device, specific method include:
Open device, short-circuiting device, 10k Ω load resistance and element under test are respectively connected to the second signal of impedance transformer
Input port, the amplitude ratio for measuring two signal input part institute input signal respectively by range detector is ρopen、
ρshort、ρloadAnd ρDUT, and record and show by processor and display unit；
Pass through ρopen、ρshort、ρloadAnd ρDUTCalculate separately out directional error EDF, the source matching error of measuring device
ESF and reverse transfer error E RF；
The reflection of device under test is calculated by directional error EDF, source matching error ESF and reverse transfer error E RF
Coefficient | S11|, pass through | ZDUT|=(1+ | S11|)/(1-|S11|) impedance of device under test is calculated | ZDUT|；
Above-mentioned calculating process passes through processor and display unit progress, processor and display unit for the resistance of device under test
It is anti-| ZDUT| it is shown.
Preferably, the reflection coefficient of device under test | S11| especially by
|S11|=(ρDUT-|EDF|)/(|ERF|+(ρDUT| EDF |) | ESF |) be calculated.
Preferably, reverse transfer error E RF passes through | ERF |=2 (ρopen-|EDF|)(ρshort-|EDF|)/(ρopen+
ρshort) be calculated；
Source matching error ESF passes through | ESF |=| ρopen-ρshort-2|EDF||/|ρopen+ρshort| it is calculated；
Directional error | EDF |=ρload。
The beneficial effects of the present invention are: including test and excitation signal source, power splitter, directional coupler, amplitude in the present invention
The impedance of 50 Europe systems is transformed to 10 kilo-ohms using impedance transformer by the modules such as measuring appliance, processor and display unit, and with
High impedance is calibrated and tested on the basis of 10 kilo-ohms, greatly improves high impedance test precision；And it constructs simplified
Calibration algorithm reduces cost to simplify receiver structure；And shown by test result through impedance transformation and calibration process
Afterwards, the accuracy that can significantly improve test high impedance, enables the system to be widely applied in high impedance test.
[Detailed description of the invention]
Fig. 1 is the functional block diagram of high impedance radio frequency measuring device in the embodiment of the present invention；
The domain of directional coupler in the embodiment of the present invention of the position Fig. 2；
The schematic diagram of directional coupler in the embodiment of the present invention of the position Fig. 3；
Fig. 4 is the test result figure that LC resonance circuit (465KHz centre frequency) is tested in the embodiment of the present invention；
Fig. 5 is that the measurement method in the embodiment of the present invention using traditional based on 50 Europe systems tests LC resonance circuit
The test result figure of (465KHz centre frequency).
Wherein: 1. exciting signal sources；2. power splitter；3. directional coupler；4. impedance transformer；5. range detector；6.
Processor and display unit；41. second signal input port.
[specific embodiment]
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The invention discloses a kind of high impedance radio frequency measuring devices, as shown in Figure 1, including exciting signal source 1, pumping signal
The signal output end in source 1 is connected to the signal input part of power splitter 2, and power splitter 2 is selected the power splitter there are two output end, will be swashed
Encourage signal source 1 sending pumping signal be divided into two parts after, exported by two output ports, one signal output end
It is connected to the signal input part of directional coupler 3, another signal output end is connected to the signal input of range detector 5
End.
The signal output end of directional coupler 3 is connected to the first signal input part of impedance transformer 4, impedance transformer 4
It is additionally provided with second signal input port 41, second signal input port 41 is used to connect with device under test and measurement accessory.It surveys
Amount accessory is made of open device, short-circuiting device and load resistance, and load resistance resistance value is 10k Ω.
The coupling port of directional coupler 3 can be made to generate a variety of amplitudes by measuring accessory combined impedance converter 4
Signal is obtaining multiple amplitude ratios by these signal combination amplitude measurement devices 5, the calculating that can simplify by amplitude ratio
The impedance of device under test out.
The impedance in 50 Europe of system is transformed to 10 kilo-ohms by impedance transformer 4；MeetRelationship, Z1=50, Z2
=10000, N1, N2 are respectively the primary circle number with secondary coil in impedance transformer.
The coupling port of directional coupler 3 is connected to another signal input part of range detector 5, range detector 5
Signal output end be connected to processor and display unit 6.Range detector 5 completes the detection of two paths of signals amplitude ratio, with
The mode of DC voltage exports, this signal enters processor and display single 6, to complete man-machine interface interaction process.
It calculated, stored and is shown by the amplitude ratio that processor and display unit 6 measure range detector 5,
Measurement process is simplified, simplifies receiver structure, reduces the cost of receiver.
The invention also discloses a kind of impedance detecting methods of high impedance radio frequency device, are penetrated using a kind of above-mentioned high impedance
Frequency measuring device, specific method include:
Open device, short-circuiting device, 10k Ω load resistance and element under test are respectively connected to the second letter of impedance transformer 4
Number input port is ρ by the amplitude ratio that range detector 5 measures two signal input part institute input signal respectivelyopen、
ρshort、ρloadAnd ρDUT, and record and show by processor and display unit 6.
Pass through ρopen、ρshort、ρloadAnd ρDUTCalculate separately out directional error EDF, the source matching error of measuring device
ESF and reverse transfer error E RF.
It is specific: directional error | EDF |=ρload；
Source matching error ESF passes through | ESF |=| ρopen-ρshort-2|EDF||/|ρopen+ρshort| it is calculated；
Reverse transfer error E RF passes through | ERF |=2 (ρopen-|EDF|)(ρshort-|EDF|)/(ρopen+ρshort) calculate
Out；
Pass through | S11|=(ρDUT-|EDF|)/(|ERF|+(ρDUT| EDF |) | ESF |), bonding position error E DF, source
Matching error ESF and reverse transfer error E RF calculates the reflection coefficient of device under test | S11|。
Finally, passing through | ZDUT|=(1+ | S11|)/(1-|S11|) impedance of device under test is calculated | ZDUT|；
Above-mentioned calculating process passes through processor and the progress of display unit 6, processor and display unit 6 for device under test
Impedance | ZDUT| it is shown.
Embodiment
In the present embodiment, the use of exciting signal source 1 AD9910 chip in the device, frequency coverage 0-400MHz,
Directional coupler 3 uses ADC-15-4+ chip, and frequency coverage 5MHz-1000MHz, the degree of coupling is about 15dB, direction
Property be greater than 20dB, domain be Fig. 2 shown in, schematic diagram be Fig. 3 shown in.Range detector 5 uses AD8302 module, and frequency is covered
Lid range up to 2700MHz.Impedance transformer 4 converts ratio using 1:200, i.e., 50 Europe of impedance is transformed to 10 kilo-ohms.Function
Rate distributor uses the ZA3CS-400-3W+ model of mini-circuits company.
By the device, using above-mentioned test method, test center's frequency is about the resonance resistance of 465KHz resonant tank
It is anti-, obtain that test results are shown in figure 4, it is still accurate and do not have by test result as it can be seen that Impedance measurement is up to 290.82 kilo-ohms
There is noise, accuracy is significantly higher than other test macros based on 50 Europe, and calculating its visible Q value after tested is about 95.
As shown in figure 5, for using the test result figure of traditional test device based on 50 Europe, as seen from the figure with survey
The raising of impedance is tried, noise is very big, and validity test precision is less than the Europe 10K.
Shown according to above-mentioned test result by after impedance transformation and calibration process, test device and test of the invention
Method can significantly improve the accuracy of test high impedance, greatly improve the measuring accuracy of high resistant resistant to device, and construct
Simplified calibration algorithm, simplifies receiver structure, reduces costs, and the system is enable to be widely applied to high impedance test
In.
Claims (6)
1. a kind of high impedance radio frequency measuring device, which is characterized in that including exciting signal source (1), the exciting signal source (1)
Signal output end is connected to the signal input part of power splitter (2), and a signal output end of the power splitter (2) is connected to orientation
Another signal output end of the signal input part of coupler (3), the power splitter (2) is connected to the one of range detector (5)
A signal input part；
The signal output end of the directional coupler (3) is connected to the first signal input part of impedance transformer (4), the impedance
Converter (4) is additionally provided with second signal input port (41), and the second signal input port is used for and device under test and survey
Measure accessory connection；
The coupling port of the directional coupler (3) is connected to another signal input part of the range detector (5), described
The signal output end of range detector (5) is connected to processor and display unit (6).
2. a kind of high impedance radio frequency measuring device as described in claim 1, which is characterized in that the measurement accessory is by opening a way
Device, short-circuiting device and load resistance composition.
3. a kind of high impedance radio frequency measuring device as claimed in claim 2, which is characterized in that the load resistance resistance value is
10kΩ。
4. a kind of impedance detecting method of high impedance radio frequency device, which is characterized in that use claim 1-3 any described one
Kind high impedance radio frequency measuring device, specific method include:
Open device, short-circuiting device, 10k Ω load resistance and element under test are respectively connected to the second signal of impedance transformer (4)
Input port is ρ by the amplitude ratio that range detector (5) measures two signal input part institute input signal respectivelyopen、
ρshort、ρloadAnd ρDUT, and record and show by the processor and display unit (6)；
Pass through ρopen、ρshort、ρloadAnd ρDUTCalculate separately out directional error EDF, the source matching error ESF of the measuring device
With reverse transfer error E RF；
The reflection of device under test is calculated by the directional error EDF, source matching error ESF and reverse transfer error E RF
Coefficient | S11|, pass through | ZDUT|=(1+ | S11|)/(1-|S11|) impedance of the device under test is calculated | ZDUT|；
Above-mentioned calculating process passes through the processor and display unit (6) progress, the processor and display unit (6) for institute
State the impedance of device under test | ZDUT| it is shown.
5. a kind of impedance detecting method of high impedance radio frequency device as claimed in claim 4, which is characterized in that the device to be measured
The reflection coefficient of part | S11| especially by | S11|=(ρDUT-|EDF|)/(|ERF|+(ρDUT| EDF |) | ESF |) calculate
Out.
6. a kind of impedance detecting method of high impedance radio frequency device as claimed in claim 5, which is characterized in that the reversed biography
Defeated error E RF passes through | ERF |=2 (ρopen-|EDF|)(ρshort-|EDF|)/(ρopen+ρshort) be calculated；
The source matching error ESF passes through | ESF |=| ρopen-ρshort-2|EDF||/|ρopen+ρshort| it is calculated；
The directional error | EDF |=ρload。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110806506A (en) * | 2019-10-23 | 2020-02-18 | 西安交通大学 | Contact impedance measurement system and method for radio frequency band electric contact element |
| CN111983317A (en) * | 2020-08-07 | 2020-11-24 | 西安科技大学 | Impedance characteristic testing device |
| CN112394254A (en) * | 2020-12-15 | 2021-02-23 | 广电计量检测（成都）有限公司 | Measurement system for injection signal detection probe and military standard CS101 project |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080191712A1 (en) * | 2005-07-25 | 2008-08-14 | University Of Florida Research Foundation, Inc. | System, Device, and Method for Embedded S-Parameter Measurement |
| CN101782609A (en) * | 2009-10-21 | 2010-07-21 | 芯通科技（成都）有限公司 | Low radio frequency impedance measuring equipment |
| CN103454542A (en) * | 2013-09-11 | 2013-12-18 | 中国电子科技集团公司第四十一研究所 | Antenna, transmission line tester and real-time automatic correction method |
| CN104316785A (en) * | 2014-10-08 | 2015-01-28 | 中国电子科技集团公司第四十一研究所 | Antenna feeder tester and extending device error correction method |
| CN105790786A (en) * | 2015-01-13 | 2016-07-20 | 苹果公司 | Electronic Device With Impedance Measurement Circuitry |
| CN206002601U (en) * | 2016-08-22 | 2017-03-08 | 深圳市联合东创科技有限公司 | RF impedance test device |
| CN108173557A (en) * | 2018-03-01 | 2018-06-15 | 汽-大众汽车有限公司 | A kind of active matching network equipment |
| CN207908587U (en) * | 2018-01-23 | 2018-09-25 | 深圳市信维通信股份有限公司 | A kind of antenna rf and testing impedance jig |
-
2018
- 2018-11-09 CN CN201811332962.1A patent/CN109470922A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080191712A1 (en) * | 2005-07-25 | 2008-08-14 | University Of Florida Research Foundation, Inc. | System, Device, and Method for Embedded S-Parameter Measurement |
| CN101782609A (en) * | 2009-10-21 | 2010-07-21 | 芯通科技（成都）有限公司 | Low radio frequency impedance measuring equipment |
| CN103454542A (en) * | 2013-09-11 | 2013-12-18 | 中国电子科技集团公司第四十一研究所 | Antenna, transmission line tester and real-time automatic correction method |
| CN104316785A (en) * | 2014-10-08 | 2015-01-28 | 中国电子科技集团公司第四十一研究所 | Antenna feeder tester and extending device error correction method |
| CN105790786A (en) * | 2015-01-13 | 2016-07-20 | 苹果公司 | Electronic Device With Impedance Measurement Circuitry |
| CN206002601U (en) * | 2016-08-22 | 2017-03-08 | 深圳市联合东创科技有限公司 | RF impedance test device |
| CN207908587U (en) * | 2018-01-23 | 2018-09-25 | 深圳市信维通信股份有限公司 | A kind of antenna rf and testing impedance jig |
| CN108173557A (en) * | 2018-03-01 | 2018-06-15 | 汽-大众汽车有限公司 | A kind of active matching network equipment |
Non-Patent Citations (4)
| Title |
|---|
| 储飞黄主编: "《电子测量实用教程》", 30 April 2014, 合肥工业大学出版社 * |
| 姜勤波，余志勇，张辉著: "《电磁场与微波技术基础》", 31 July 2016, 北京航空航天大学出版社 * |
| 赵同刚，高英，崔岩松编著: "《通信电子电路实验与仿真》", 31 January 2016, 北京邮电大学出版社 * |
| 马延军: "一种异频相参源的矢量网络分析仪", 《电磁场与微波》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110806506A (en) * | 2019-10-23 | 2020-02-18 | 西安交通大学 | Contact impedance measurement system and method for radio frequency band electric contact element |
| CN111983317A (en) * | 2020-08-07 | 2020-11-24 | 西安科技大学 | Impedance characteristic testing device |
| CN112394254A (en) * | 2020-12-15 | 2021-02-23 | 广电计量检测（成都）有限公司 | Measurement system for injection signal detection probe and military standard CS101 project |
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Application publication date: 20190315 |