CN113325237A - Radio frequency impedance measuring method - Google Patents
Radio frequency impedance measuring method Download PDFInfo
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- CN113325237A CN113325237A CN202110557461.9A CN202110557461A CN113325237A CN 113325237 A CN113325237 A CN 113325237A CN 202110557461 A CN202110557461 A CN 202110557461A CN 113325237 A CN113325237 A CN 113325237A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
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Abstract
The invention relates to the field of electronic measurement, in particular to a radio frequency impedance measurement method. The method comprises the following steps: test signal generation, radio frequency impedance measurement and measurement result correction. The test signal generates a radio frequency signal with the frequency range of 9 kHz-3.6 GHz and the maximum output power of 10 dBm; the radio frequency impedance measurement is used for measuring the impedance of the tested piece; the measurement result correction is used for measuring residual parameters in the circuit, and compensation correction is carried out on the actual measurement result. The method can realize accurate measurement of the radio frequency impedance with the frequency range of 9 kHz-3.6 GHz and the impedance module value range of 1m omega-100 k omega, and has stable performance and convenient operation and use.
Description
Technical Field
The invention relates to the field of electronic measurement, in particular to a radio frequency impedance measurement method.
Background
At present, the radio frequency impedance measurement mainly uses a reflection coefficient method to obtain an impedance value by measuring a test signal and a reflection signal of a tested device, but the method can obtain higher measurement precision only when the impedance value of the tested device is in the vicinity of the characteristic impedance of a measurement circuit. The impedance measurement is carried out according to the radio frequency voltage and the radio frequency current, so that a wider measurement range and higher measurement accuracy can be obtained, but the measurement method is complicated, and two measurement circuits of high resistance and low resistance are required to be used according to the difference of the impedance value of a measured piece.
Therefore, it is necessary to develop a simple and reliable rf impedance measurement method based on rf voltage and current measurement to meet the requirement of accurate measurement of rf impedance.
Disclosure of Invention
The invention aims to provide a radio frequency impedance measuring method.
In order to realize the purpose, the specific technical scheme is as follows:
a radio frequency impedance measurement method, comprising the steps of: test signal generation, radio frequency impedance measurement and measurement result correction.
The test signal generation step specifically comprises: and setting a radio frequency signal generator to generate and output a sinusoidal signal with specified frequency and power according to the test requirements.
The output frequency range of the radio frequency signal generator is 9 kHz-3.6 GHz, and the output power is-40 dBm-10 dBm.
The test signal generating step is used for generating radio frequency signals with the frequency range of 9 kHz-3.6 GHz and the maximum output power of 10 dBm.
The radio frequency impedance measuring method specifically comprises the following steps:
(1) the signal input end of the test seat is connected with a radio frequency signal source, the test end is connected with a tested piece, and the radio frequency voltage output end and the radio frequency current output end are respectively connected with CH1 and CH2 channels of the oscilloscope;
(2) the oscilloscope is set to be in a voltage measurement mode, 50 omega input impedance is adopted, and a time base axis and a voltage axis of the oscilloscope are set according to the test frequency and the power;
(3) measuring voltage amplitude values of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain an impedance modulus | Z | of the measured piece; measuring the phase difference theta of the two channels to obtain the radio frequency impedance measurement of the measured piece under the measurement frequency fMagnitude Z ═ Z | ej2 πfθ。
The test seat is provided with a signal input end, a test end, a radio frequency voltage output end and a radio frequency current output end, and the working frequency range is 9 kHz-3.6 GHz.
The oscilloscope is a double-channel or four-channel oscilloscope, the measurement bandwidth is 4GHz, the sampling rate is 20GSa/s, and a 12-bit DAC is configured.
The radio frequency impedance measuring step is used for measuring the impedance of the tested piece.
Wherein, the measurement result correction step specifically comprises:
(1) keeping the connection relation of the measuring device unchanged, and connecting the circuit breaker to the testing end of the testing seat;
(2) measuring the amplitude value of the voltage of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain the impedance modulus value | Z of the open-circuit deviceOL, |; measuring the phase difference theta of two channelsOThe RF impedance measurement value of the circuit breaker at the measurement frequency f is
(3) Connecting a short-circuiting device to the testing end of the testing seat;
(4) measuring the amplitude value of the voltage of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain the impedance modulus value | Z of the short-circuiting devicesL, |; measuring the phase difference theta of two channelsSThe radio frequency impedance of the short-circuiting device at the measuring frequency f is measured as
(5) Connecting a 50 omega load to a test end of a test socket;
(6) measuring the amplitude value of the voltage of the two channels by using an oscilloscope, calculating the ratio of the amplitude values, and multiplying by 50 to obtain the modulus value | Z of the load impedance of 50 ohmsLL. Measuring the phase difference theta of two channelsLThe RF impedance measurement for a 50 Ω load at a measurement frequency f is
(7) Finishing the correction of the measured value of the radio frequency impedance of the measured piece according to the formula (1) to obtain the impedance value Z' of the measured piece;
and the measurement result correction step is used for measuring residual parameters in the circuit and compensating and correcting the actual measurement result.
The measuring device adopted by the radio frequency impedance measuring method comprises a signal source, a test seat and an oscilloscope which are sequentially and electrically connected, and further comprises a calibration piece, wherein the calibration piece comprises a short-circuiting device, a circuit breaker and a 50 omega load.
Compared with the prior art, the invention has the beneficial effects that:
the measuring frequency range of the radio frequency impedance measuring method is 9 kHz-3.6 GHz, the impedance module value range is 1m omega-100 k omega, the problems of complexity and inconvenient operation of the radio frequency impedance measuring device are solved, and the reliability and the accuracy of measurement are effectively improved.
The radio frequency impedance measuring method of the present invention will be further explained with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an RF impedance measurement apparatus;
FIG. 2 is a flow chart of RF impedance measurement;
fig. 3 is a photograph of the measurement process of example 2.
The method comprises the following steps of 1-a signal source, 2-a test seat and 3-an oscilloscope; 4-short circuit device, 5-open circuit device, 6-50 omega load.
Detailed Description
Example 1
As shown in fig. 2, a radio frequency impedance measuring method includes the following steps: test signal generation, radio frequency impedance measurement and measurement result correction. Wherein, the test signal generates a radio frequency signal with a frequency range of 9 kHz-3.6 GHz and a maximum output power of 10 dBm; the radio frequency impedance measurement is used for measuring the impedance of the tested piece; the measurement result correction is used for measuring residual parameters in the circuit, and compensation correction is carried out on the actual measurement result.
(1) The test signal generating step specifically comprises: and setting a radio frequency signal generator to generate and output a sinusoidal signal with specified frequency and power according to the test requirements.
The output frequency range of the radio frequency signal generator is 9 kHz-3.6 GHz, and the output power is-40 dBm-10 dBm.
(2) The radio frequency impedance measurement steps are specifically as follows:
1) the signal input end of the test seat is connected with a radio frequency signal source, the test end is connected with a tested piece, and the radio frequency voltage output end and the radio frequency current output end are respectively connected with CH1 and CH2 channels of the oscilloscope;
2) the oscilloscope is set to be in a voltage measurement mode, 50 omega input impedance is adopted, and a time base axis and a voltage axis of the oscilloscope are set according to the test frequency and the power;
3) measuring voltage amplitude values of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain an impedance modulus | Z | of the measured piece; measuring the phase difference theta of the two channels to obtain a radio frequency impedance measured value Z ═ Z | e of the measured piece under the measurement frequency fj2 πfθ。
The test seat is provided with a signal input end, a test end, a radio frequency voltage output end and a radio frequency current output end, and the working frequency range is 9 kHz-3.6 GHz. The oscilloscope is a dual channel or a four channel, the measurement bandwidth is 4GHz, the sampling rate is 20GSa/s, and a 12-bit DAC is configured.
(3) The measuring result correcting step specifically comprises the following steps:
1) keeping the connection relation of the measuring device unchanged, and connecting the circuit breaker to the testing end of the testing seat;
2) measuring the amplitude value of the voltage of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain the impedance modulus value | Z of the open-circuit deviceOL, |; measuring the phase difference theta of two channelsOThe RF impedance measurement value of the circuit breaker at the measurement frequency f is
3) Connecting a short-circuiting device to the testing end of the testing seat;
4) a two-channel voltage amplitude value was measured using an oscilloscope,calculating the ratio of the amplitudes, and multiplying by 50 to obtain the impedance modulus value | Z of the short-circuit devicesL, |; measuring the phase difference theta of two channelsSThe radio frequency impedance of the short-circuiting device at the measuring frequency f is measured as
5) Connecting a 50 omega load to a test end of a test socket;
6) measuring the amplitude value of the voltage of the two channels by using an oscilloscope, calculating the ratio of the amplitude values, and multiplying by 50 to obtain the modulus value | Z of the load impedance of 50 ohmsLL. Measuring the phase difference theta of two channelsLThe RF impedance measurement for a 50 Ω load at a measurement frequency f is
7) Finishing the correction of the measured value of the radio frequency impedance of the measured piece according to the formula (1) to obtain the impedance value Z' of the measured piece;
as shown in fig. 1, the radio frequency impedance measuring device adopted by the method comprises a signal source 1, a test socket 2 and an oscilloscope 3 which are electrically connected in sequence, and further comprises a calibration piece, wherein the calibration piece comprises a short-circuiting device 4, an open-circuiting device 5 and a 50 Ω load 6.
Example 2
The impedance of a 10cm air line open circuit was measured using the method and apparatus of example 1.
1. Test objects: 10cm air line opener, model 16190B.
2. And (3) testing connection: as shown in fig. 3.
The testing process comprises the following steps:
(1) the output of the radio frequency signal source is connected to the signal input end of the test seat, and the CH1 channel and the CH2 channel of the oscilloscope are respectively connected with the radio frequency voltage output end and the radio frequency current output end of the test seat;
(2) the oscilloscope is set to be in a voltage measurement mode, and the impedance is input at 50 omega;
(3) connecting a 10cm air line open-circuit device to a test end of a test seat, setting the output frequency of a signal generator to be 1MHz, and measuring the voltage amplitude value and the phase of two channels by using an oscilloscope to obtain the impedance modulus | Z | and the phase difference theta of a tested piece under 1 MHz;
(4) setting the frequencies of the signal generators to be 10MHz, 100MHz, 200MHz, 300MHz, 500MHz, 600MHz, 800MHz, 1GHz, 1.6GHz, 1.8GHz, 2GHz, 2.2GHz, 2.4GHz, 2.6GHz and 3GHz, repeating the steps (3) to (4), and completing the measurement and correction of the impedance under different frequencies.
The measurement results are as follows:
note: the standard value is from the air line open circuit device calibration certificate of Chinese institute of metrology science 16190B10cm (certificate number: XDgp 2021-10196).
And (4) conclusion:
at present, impedance measurement in the frequency band of 9 kHz-3.6 GHz mainly has two modes:
(1) the impedance of a tested piece is obtained by measuring the reflection coefficient by using a network analyzer, but the measurement range of the method is 10 omega-1 k omega, and the measurement requirement of high impedance cannot be met;
(2) by using a radio frequency impedance analyzer, the device can realize the measurement of 10m omega-20 k omega impedance in the frequency range of 9 kHz-3.6 GHz, but the device is expensive, and the unit price is about 60 ten thousand yuan.
Compared with the prior art, the method is simple to operate, can be matched with various measuring clamps, and can realize accurate measurement of the impedance value within the frequency range of 9 kHz-3.6 GHz, and the measurement error is less than 3%.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A method of radio frequency impedance measurement, comprising the steps of: generating a test signal, measuring radio frequency impedance and correcting a measurement result;
the radio frequency impedance measuring method specifically comprises the following steps:
(1) the signal input end of the test seat is connected with a radio frequency signal source, the test end is connected with a tested piece, and the radio frequency voltage output end and the radio frequency current output end are respectively connected with CH1 and CH2 channels of the oscilloscope;
(2) the oscilloscope is set to be in a voltage measurement mode, 50 omega input impedance is adopted, and a time base axis and a voltage axis of the oscilloscope are set according to the test frequency and the power;
(3) measuring voltage amplitude values of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain an impedance modulus | Z | of the measured piece; measuring the phase difference theta of the two channels to obtain a radio frequency impedance measured value Z ═ Z | e of the measured piece under the measurement frequency fj2πfθ。
2. The radio frequency impedance measurement method of claim 1, wherein: the test seat is provided with a signal input end, a test end, a radio frequency voltage output end and a radio frequency current output end, and the working frequency range is 9 kHz-3.6 GHz.
3. A radio frequency impedance measurement method according to claim 2, wherein: the oscilloscope is a double-channel or four-channel oscilloscope, the measurement bandwidth is 4GHz, the sampling rate is 20GSa/s, and a 12-bit DAC is configured.
4. A radio frequency impedance measurement method according to claim 3, wherein: the radio frequency impedance measuring step is used for measuring the impedance of the tested piece.
5. The radio frequency impedance measurement method of claim 1, wherein: the test signal generating step specifically comprises: and setting a radio frequency signal generator to generate and output a sinusoidal signal with specified frequency and power according to the test requirements.
6. The radio frequency impedance measurement method of claim 5, wherein: the output frequency range of the radio frequency signal generator is 9 kHz-3.6 GHz, and the output power is-40 dBm-10 dBm.
7. The radio frequency impedance measurement method of claim 6, wherein: the test signal generating step is used for generating radio frequency signals with the frequency range of 9 kHz-3.6 GHz and the maximum output power of 10 dBm.
8. The radio frequency impedance measurement method of claim 1, wherein: the measurement result correction step specifically comprises the following steps:
(1) keeping the connection relation of the measuring device unchanged, and connecting the circuit breaker to the testing end of the testing seat;
(2) measuring the amplitude value of the voltage of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain the impedance modulus value | Z of the open-circuit deviceOL, |; measuring the phase difference theta of two channelsOThe RF impedance measurement value of the circuit breaker at the measurement frequency f is
(3) Connecting a short-circuiting device to the testing end of the testing seat;
(4) measuring the amplitude value of the voltage of the two channels by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying by 50 to obtain the impedance modulus value | Z of the short-circuiting devicesL, |; measuring the phase difference theta of two channelsSThe radio frequency impedance of the short-circuiting device at the measuring frequency f is measured as
(5) Connecting a 50 omega load to a test end of a test socket;
(6) measuring the two-channel voltage amplitude value by using an oscilloscope, calculating the ratio of the amplitudes, and multiplying the ratio by 50 to obtain 50Omega load impedance modulus value | ZLL. Measuring the phase difference theta of two channelsLThe RF impedance measurement for a 50 Ω load at a measurement frequency f is
(7) Finishing the correction of the measured value of the radio frequency impedance of the measured piece according to the formula (1) to obtain the impedance value Z' of the measured piece;
9. the radio frequency impedance measurement method of claim 8, wherein: and the measurement result correction step is used for measuring residual parameters in the circuit and compensating and correcting the actual measurement result.
10. The radio frequency impedance measurement method of claim 1, wherein: the measuring device adopted by the measuring method comprises a signal source (1), a test seat (2) and an oscilloscope (3) which are sequentially and electrically connected, and further comprises a calibrating piece, wherein the calibrating piece comprises a short-circuiting device (4), a circuit breaker (5) and a 50 omega load (6).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117929854A (en) * | 2024-03-22 | 2024-04-26 | 深圳市瀚强科技股份有限公司 | Load impedance detection circuit and radio frequency power supply device |
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