CN204719132U - A kind of phase detector for measuring antenna impedance - Google Patents
A kind of phase detector for measuring antenna impedance Download PDFInfo
- Publication number
- CN204719132U CN204719132U CN201520312869.XU CN201520312869U CN204719132U CN 204719132 U CN204719132 U CN 204719132U CN 201520312869 U CN201520312869 U CN 201520312869U CN 204719132 U CN204719132 U CN 204719132U
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- phase
- pin
- operational amplifier
- demodulation chip
- phase demodulation
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Abstract
The utility model discloses a kind of phase detector for measuring antenna impedance, include phase discriminator and low-pass filter circuit, phase discriminator includes two input circuits and phase demodulation chip, article two, input circuit is connected respectively by 6 pin of electric capacity C1 and electric capacity C2 and phase demodulation chip and 2 pin, low-pass filter circuit includes operational amplifier, 9 pin of phase demodulation chip are connected with the positive input terminal of operational amplifier by resistance R2, one end of 9 pin of phase demodulation chip also contact resistance R1, the other end ground connection of resistance R1, the negative input end of operational amplifier is connected with output terminal.The utility model is applicable to no matter how antenna place plasma distribution parameter changes, can Measurement accuracy place directional coupler place incident wave and reflection wave phase differential, the impedance of antenna place is calculated again according to incident power and reflective power, there is low-pass filtering amplifying circuit phase detector rear end, reduce external interference, improve measuring accuracy, there is structure simple simultaneously, the advantages such as convenient installation enforcement.
Description
Technical field
The utility model relates to ion involution heating system radio-frequency power coupling technique field, particularly relates to a kind of phase detector for measuring antenna impedance.
Background technology
Along with the raising that nuclear fusion device requires ion involution high power and long pulse steady-state operation, the coupling efficiency of ion involution frequency range ripple is subject to the very big attention of each bigger device.Theoretical research shows, the mutual impedance of antenna is an important sign of ion involution frequency range Wave coupling efficiency.When ion involution antenna leads to ripple, due to the difference of boundary plasma distribution parameter, the difference of the mutual impedance of antenna is also very large.Theoretical and ion involution coupling experiment all confirms, lower antenna impedance can cause transmission line standing wave voltage to increase, increase the probability of transmission line sparking, likely damage transmission line system, reduce the rf wave energy of effectively transmission, and lower mutual impedance causes lower coupling efficiency, thus impact is injected into the heating power of plasma core.Following EAST carries out long pulse experiment under all-metal wall condition, and the coupled power level requirement injecting EAST plasma will much larger than existing power level, thus coupling efficiency merits attention more, expects to run in high mutual impedance situation, strikes sparks damage to avoid transmission line.Thus need to find a kind of real-time measuring method to obtain antenna-coupled impedance, coupled problem is studied.Theoretical according to microwave transmission line, measure the modulus value of reflection coefficient and the phase differential between incident wave and reflection wave, the reflection coefficient of this point can be calculated, thus extrapolate this input impedance, then the input impedance of arbitrfary point can be extrapolated according to transmission line theory.In ion involution heating system, incident power and reflective power can be measured at directional coupler place, calculate this point reflection coefficient modulus value, if there is suitable phase detector to measure phase place between incident wave and reflection wave, then can calculate reflection coefficient and the input impedance at directional coupler place, then extrapolate antenna-coupled impedance.
Utility model content
The utility model object is exactly the defect in order to make up prior art, provides a kind of phase detector for measuring antenna impedance.
The utility model is achieved through the following technical solutions:
A kind of phase detector for measuring antenna impedance, include phase discriminator and low-pass filter circuit, described phase discriminator includes two input circuits and phase demodulation chip, two described input circuits are connected respectively by 6 pin of electric capacity C1 and electric capacity C2 and phase demodulation chip and 2 pin, described low-pass filter circuit includes operational amplifier, 9 pin of phase demodulation chip are connected with the positive input terminal of operational amplifier by resistance R2, one end of 9 pin of phase demodulation chip also contact resistance R1, the other end ground connection of resistance R1, the negative input end of operational amplifier is connected with output terminal, the positive power source terminal ground connection of operational amplifier, electric capacity C3 is connected with between positive power source terminal and positive input terminal, 4 pin of phase demodulation chip are all connected with linear power supply with the negative power end of operational amplifier, the output terminal of operational amplifier is phase detector output.
The model of described phase demodulation chip is AD8302.
Described phase demodulation chip measurement range 10MHz-100MHz, input signal size is-40dBm-0dBm.
It is 0-50kHz that described low-pass filter circuit leads to ripple frequency range; Described low-pass filter circuit signal is enlarged into 2 times.
The utility model has the advantages that: the utility model is applicable to no matter how antenna place plasma distribution parameter changes, can Measurement accuracy place directional coupler place incident wave and reflection wave phase differential, the impedance of antenna place is calculated again according to incident power and reflective power, there is low-pass filtering amplifying circuit phase detector rear end, reduce external interference, improve measuring accuracy, there is structure simple simultaneously, the advantages such as convenient installation enforcement.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
As shown in Figure 1, a kind of phase detector for measuring antenna impedance, include phase discriminator 1 and low-pass filter circuit 2, described phase discriminator 1 includes two input circuits 3 and phase demodulation chip 4, two described input circuits 3 are connected respectively by 6 pin of electric capacity C1 and electric capacity C2 and phase demodulation chip 4 and 2 pin, described low-pass filter circuit 2 includes operational amplifier 5, 9 pin of phase demodulation chip 4 are connected with the positive input terminal of operational amplifier 5 by resistance R2, one end of 9 pin of phase demodulation chip 4 also contact resistance R1, the other end ground connection of resistance R1, the negative input end of operational amplifier 5 is connected with output terminal, the positive power source terminal ground connection of operational amplifier 5, electric capacity C3 is connected with between positive power source terminal and positive input terminal, 4 pin of phase demodulation chip 4 are all connected with linear power supply 6 with the negative power end of operational amplifier 5, the output terminal of operational amplifier 5 is phase detector output.
The model of described phase demodulation chip is AD8302.
Described phase demodulation chip measurement range 10MHz-100MHz, input signal size is-40dBm-0dBm.
It is 0-50kHz that described low-pass filter circuit leads to ripple frequency range; Described low-pass filter circuit signal is enlarged into 2 times.
Claims (4)
1. one kind for measuring the phase detector of antenna impedance, it is characterized in that: include phase discriminator and low-pass filter circuit, described phase discriminator includes two input circuits and phase demodulation chip, two described input circuits are connected respectively by 6 pin of electric capacity C1 and electric capacity C2 and phase demodulation chip and 2 pin, described low-pass filter circuit includes operational amplifier, 9 pin of phase demodulation chip are connected with the positive input terminal of operational amplifier by resistance R2, 9 pin of phase demodulation chip also connect one end of pull down resistor R1, the other end ground connection of pull down resistor R1, the negative input end of operational amplifier is connected with output terminal, the positive power source terminal ground connection of operational amplifier, electric capacity C3 is connected with between positive power source terminal and positive input terminal, 4 pin of phase demodulation chip are all connected with linear power supply with the negative power end of operational amplifier, the output terminal of operational amplifier is phase detector output.
2. a kind of phase detector for measuring antenna impedance according to claim 1, is characterized in that: the model of described phase demodulation chip is AD8302.
3. a kind of phase detector for measuring antenna impedance according to claim 1, is characterized in that: described phase demodulation chip measurement range 10MHz-100MHz, input signal size is-40dBm-0dBm.
4. a kind of phase detector for measuring antenna impedance according to claim 1, is characterized in that: it is 0-50kHz that described low-pass filter circuit leads to ripple frequency range; Described low-pass filter circuit signal is enlarged into 2 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520312869.XU CN204719132U (en) | 2015-05-14 | 2015-05-14 | A kind of phase detector for measuring antenna impedance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520312869.XU CN204719132U (en) | 2015-05-14 | 2015-05-14 | A kind of phase detector for measuring antenna impedance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204719132U true CN204719132U (en) | 2015-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520312869.XU Expired - Fee Related CN204719132U (en) | 2015-05-14 | 2015-05-14 | A kind of phase detector for measuring antenna impedance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204719132U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841813A (en) * | 2017-03-08 | 2017-06-13 | 深圳市尧元科技有限公司 | Measure the device and method of magnetic resonance type wireless charging system transmitting terminal input impedance |
| CN107132415A (en) * | 2017-05-05 | 2017-09-05 | 中国科学院合肥物质科学研究院 | Ion involution antenna impedance measuring system based on voltage probe and current probe |
-
2015
- 2015-05-14 CN CN201520312869.XU patent/CN204719132U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106841813A (en) * | 2017-03-08 | 2017-06-13 | 深圳市尧元科技有限公司 | Measure the device and method of magnetic resonance type wireless charging system transmitting terminal input impedance |
| CN107132415A (en) * | 2017-05-05 | 2017-09-05 | 中国科学院合肥物质科学研究院 | Ion involution antenna impedance measuring system based on voltage probe and current probe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20160514 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |