CN113156199A - Radio frequency power measuring device and method - Google Patents
Radio frequency power measuring device and method Download PDFInfo
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- CN113156199A CN113156199A CN202110423471.3A CN202110423471A CN113156199A CN 113156199 A CN113156199 A CN 113156199A CN 202110423471 A CN202110423471 A CN 202110423471A CN 113156199 A CN113156199 A CN 113156199A
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- 238000005259 measurement Methods 0.000 claims abstract description 21
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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Abstract
The invention relates to a radio frequency power measuring device and a method, which are characterized by comprising the following steps: the device comprises a first directional coupler, a second directional coupler, a synthesizer, a power regulating device and a power measuring device; the first directional coupler and the second directional coupler are connected in series in a radio frequency circuit to be tested, and radio frequency power to be tested enters from an incident port of the first directional coupler and is output from an output port of the second directional coupler; the isolation ports of the first directional coupler and the second directional coupler are connected with a matched load; coupling ports of the first directional coupler and the second directional coupler are respectively connected with two input ports of the synthesizer, and the power regulating device is connected between the first directional coupler or the second directional coupler and the synthesizer in series; the output port of the synthesizer is connected with the power measuring device. The invention can be widely applied to the field of radio frequency power measurement.
Description
Technical Field
The invention relates to a radio frequency power measuring device and method, and belongs to the field of radio frequency power measurement.
Background
The directional coupler is a general microwave/millimeter wave component, and can be used for signal isolation, separation and mixing, such as power monitoring, source output power stabilization, signal source isolation, transmission and reflection sweep frequency testing and the like. In recent years, radio frequency power measurement based on directional couplers is widely applied in the fields of wireless communication, accelerator physics, space application, military electronic technology and the like.
However, under the condition of large reflection, due to the insufficient directivity of the directional coupler, the crosstalk between the forward and reverse signals causes a large measurement error of the forward and reverse power, and thus the output power of the radio frequency power source and the reflected power reflected from the load end cannot be accurately calibrated.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a radio frequency power measurement apparatus and method, which can quickly and conveniently measure radio frequency power and have high accuracy of measurement result.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a radio frequency power measurement apparatus, comprising:
the device comprises a first directional coupler, a second directional coupler, a synthesizer, a power regulating device and a power measuring device;
the first directional coupler and the second directional coupler are connected in series in a radio frequency circuit to be tested, and radio frequency power to be tested enters from an incident port of the first directional coupler and is output from an output port of the second directional coupler;
the isolation ports of the first directional coupler and the second directional coupler are connected with a matched load;
coupling ports of the first directional coupler and the second directional coupler are respectively connected with two input ports of the synthesizer, and the power regulating device is connected between the first directional coupler or the second directional coupler and the synthesizer in series;
the output port of the synthesizer is connected with the power measuring device.
Further, the power adjusting device includes an attenuator and a phase shifter, the phase shifter is used for adjusting the direction of the forward signal or the reflected signal in the coupling port of the first directional coupler or the second directional coupler, and the attenuator is used for adjusting the amplitude of the forward signal or the reflected signal in the coupling port of the first directional coupler or the second directional coupler.
In a second aspect of the present invention, a method for measuring radio frequency power is provided, which includes the following steps:
1) connecting the first directional coupler and the second directional coupler in series in a radio frequency circuit to be measured, and simultaneously connecting the first directional coupler and the second directional coupler with a power regulating device, a synthesizer and a power measuring device;
2) the output signal of the output port of the synthesizer is obtained through the power measuring device, and the output signal of the coupling port of the first directional coupler is adjusted through the power adjusting device, so that the output signal of the output port of the synthesizer is only related to a forward signal or a reflected signal in a radio frequency circuit to be detected.
Further, in step 2), the method for acquiring an output signal of the output port of the combiner through the power measurement device and adjusting the output signal of the coupling port of the first directional coupler through the power adjustment device includes the following steps:
2.1) acquiring an output signal of an output port of the synthesizer by adopting a power measuring device, wherein the output signal comprises a forward component c1 and a reverse component i1 output by a coupling port of a first directional coupler, and a forward component c2 and a reverse component i2 output by a coupling port of a second directional coupler, and the phase angle of the forward component c1 and the reverse component i1 is
The phase angle of the forward component c2 is reduced relative to the phase angle of the forward component c1
Phase angle of the inverse component i2 with respect toIncrease of phase angle of inverse component i1
2.2) adjusting the power adjusting device, so that the output signal of the output port of the synthesizer is only related to the forward signal or the backward signal in the radio frequency line to be tested.
Further, in the step 2.2), the method for adjusting the power adjusting device includes the following steps:
2.2.1) adjusting the attenuator to make the inverse component i1 and the inverse component i2 in the output signals of the coupled ports of the first directional coupler and the second directional coupler equal in size, namely | i1| -i2 |;
2.2.2) adjusting the phase shifter so that the reverse component i1 and the reverse component i2 in the output signals of the coupled ports of the first directional coupler and the second directional coupler are opposite in phase, i.e., i1 is-i 2.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the two directional couplers adopted in the invention have general directivity requirements, thereby greatly reducing the requirements on the design and the manufacturing process of the directional coupler for measuring the radio frequency power. 2. The invention can realize high-precision measurement 3 of the radio frequency power when the directivity of the directional coupler is poor, and the method has simple debugging and measuring process, common process requirements on all adopted components and parts and low cost. Therefore, the invention can be widely applied to the field of radio frequency power measurement.
Drawings
FIG. 1 is a schematic view of the overall scheme of the present invention;
FIG. 2 is a schematic diagram of the output signals of coupler 1 and coupler 2 of the present invention;
FIG. 3 is a schematic diagram of the output signal of the present invention after passing through an attenuator;
FIG. 4 is a schematic diagram of the output signal of the present invention after passing through a phase shifter;
FIG. 5 is a schematic diagram of the synthesizer output signal of the present invention;
FIG. 6 is a schematic diagram of the power measurement error as a function of the position of the short tab of the sliding crowbar in an embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the present invention provides a radio frequency power measuring apparatus, which includes: directional coupler 1, directional coupler 2, combiner 3, power conditioning device, and power measuring device (not shown in the figure). The directional coupler 1 and the directional coupler 2 are connected in series in a radio frequency circuit to be tested, and radio frequency power to be tested enters from an incident port of the directional coupler 1 and is output from an output port of the directional coupler 2; the isolation ports of the directional coupler 1 and the directional coupler 2 are connected with a matched load; coupling ports of the directional coupler 1 and the directional coupler 2 are respectively connected with two input ports of the synthesizer 3, and a power regulating device is also connected between the directional coupler 1 or the directional coupler 2 and the synthesizer 3 in series; the output port of the combiner 3 is connected to a power measuring device.
Further, the power adjusting device includes an attenuator 4 and a phase shifter 5, wherein the phase shifter 5 is used for adjusting the direction of a forward or reverse signal in the coupling port of the directional coupler 1 (when the power adjusting device is connected in series between the directional coupler 1 and the combiner 3) or the directional coupler 2 (when the power adjusting device is connected in series between the directional coupler 2 and the combiner 3), and the attenuator 4 is used for adjusting the amplitude of the forward or reverse signal in the coupling port of the directional coupler 1 or the second directional coupler 2.
Based on the radio frequency power measuring device, the invention also provides a radio frequency power measuring method, which comprises the following steps:
1) the directional coupler 1 and the directional coupler 2 are connected in series in a radio frequency circuit to be measured, and are connected with the synthesizer 3, the power regulating device and the power measuring device at the same time.
As shown in fig. 1, a directional coupler 1 and a directional coupler 2 are connected to a radio frequency line to be tested, and in the figure,
is a directional couplerThe phase difference between the combiner 1 and the directional coupler 2; v+And V-are respectively the forward signal and the reverse signal in the RF line under test, P+And P-is the forward power and reverse power, respectively, in the radio frequency line under test.
2) Obtaining the output signal V of the output port of the synthesizer 3 by a power measuring deviceTAnd an output signal V to the coupling port of the directional coupler 2 through a power regulating device2Is adjusted so that the output signal V at the output port of the synthesizer 3TOnly with the forward signal V in the RF line under test+Or the inverse signal V-correlation.
Specifically, the method comprises the following steps:
2.1) obtaining the output signal V of the output port of the synthesizer 3 by adopting a power measuring deviceTThe output signal VTComprises a forward component c1 and a backward component i1 output by a coupling port of the directional coupler 1, a forward component c2 and a backward component i2 output by a coupling port of the directional coupler 2, wherein the phase angle of the forward component c1 and the backward component i1 is
The phase angle of the forward component c2 is reduced relative to the phase angle of the forward component c1
The phase angle of the reverse component i2 is increased relative to the phase angle of the reverse component i1
2.2) adjusting the power adjusting device, so that the output signal of the output port of the synthesizer 3 is only related to the forward signal or the backward signal in the radio frequency line to be tested.
The adjusting method comprises the following steps:
2.2.1) as shown in fig. 3, the attenuator 4 is adjusted so that the reverse component i1 and the reverse component i2 in the coupled port output signals of the directional coupler 1 and the directional coupler 2 are equal in size, i.e., i1| ═ i2 |.
2.2.2) the phase shifter 5 is adjusted, as shown in fig. 4, so that the reverse component i1 and the reverse component i2 in the coupled port output signals of the directional coupler 1 and the directional coupler 2 are in opposite phases, i.e. i1 is-i 2.
As shown in fig. 5, at this time, the reverse components in the two input signals of the combiner 3 to the output of the combining end will cancel each other, and the output port of the combiner 3 will only have the forward signal component. At the moment, the signals extracted by the synthesis port are only related to the forward signals in the line to be measured and are not related to the reflected signals, so that the accurate measurement of the forward signals or the reflected signals required in the radio frequency line to be measured can be realized.
Example 1
As shown in fig. 1, in this embodiment, the incident power from the transmitter in the radio frequency line to be measured is about 5kW, the frequency is 162.5MHz, the load is connected to the slidable short-circuiting device, the directivities of the directional coupler 1 and the directional coupler 2 are 26dB and 28dB, respectively, and the maximum errors of the power measurement during total reflection are 10.3% and 9.7%, respectively. The phase difference between the coupler 1 and the coupler 2 is changed by changing the position of the short-circuit piece of the sliding short-circuit device in the test
And obtaining the power measurement error under the phase difference of one period.
As shown in fig. 6, for the relationship between the power measurement error and the position of the short-circuit piece of the sliding short-circuit device in the experimental measurement result, the maximum error is about 1.7%, which is much smaller than the measurement error of a single directional coupler, thereby realizing high-precision measurement of the radio-frequency power in the radio-frequency line.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (5)
1. A radio frequency power measurement device, comprising:
the device comprises a first directional coupler, a second directional coupler, a synthesizer, a power regulating device and a power measuring device;
the first directional coupler and the second directional coupler are connected in series in a radio frequency circuit to be tested, and radio frequency power to be tested enters from an incident port of the first directional coupler and is output from an output port of the second directional coupler;
the isolation ports of the first directional coupler and the second directional coupler are connected with a matched load;
coupling ports of the first directional coupler and the second directional coupler are respectively connected with two input ports of the synthesizer, and the power regulating device is connected between the first directional coupler or the second directional coupler and the synthesizer in series;
the output port of the synthesizer is connected with the power measuring device.
2. A radio frequency power measurement apparatus as claimed in claim 1, wherein the power adjustment device comprises an attenuator and a phase shifter, the phase shifter being arranged to adjust the direction of the forward signal or the reflected signal in the coupled port of the first directional coupler or the second directional coupler, and the attenuator being arranged to adjust the amplitude of the forward signal or the reflected signal in the coupled port of the first directional coupler or the second directional coupler.
3. A method of radio frequency power measurement using the apparatus of any of claims 1 or 2, comprising the steps of:
1) connecting the first directional coupler and the second directional coupler in series in a radio frequency circuit to be measured, and simultaneously connecting the first directional coupler and the second directional coupler with a power regulating device, a synthesizer and a power measuring device;
2) the output signal of the output port of the synthesizer is obtained through the power measuring device, and the output signal of the coupling port of the first directional coupler is adjusted through the power adjusting device, so that the output signal of the output port of the synthesizer is only related to a forward signal or a reflected signal in a radio frequency circuit to be detected.
4. A radio frequency power measuring method according to claim 3, wherein in the step 2), the method for obtaining the output signal of the output port of the combiner through the power measuring device and adjusting the output signal of the coupled port of the first directional coupler through the power adjusting device comprises the following steps:
2.1) acquiring an output signal of an output port of the synthesizer by adopting a power measuring device, wherein the output signal comprises a forward component c1 and a reverse component i1 output by a coupling port of a first directional coupler, and a forward component c2 and a reverse component i2 output by a coupling port of a second directional coupler, and the phase angle of the forward component c1 and the reverse component i1 is
The phase angle of the forward component c2 is reduced relative to the phase angle of the forward component c1
The phase angle of the reverse component i2 is increased relative to the phase angle of the reverse component i1
2.2) adjusting the power adjusting device, so that the output signal of the output port of the synthesizer is only related to the forward signal or the backward signal in the radio frequency line to be tested.
5. The method of claim 4, wherein in step 2.2), the method of adjusting the power adjusting device comprises the steps of:
2.2.1) adjusting the attenuator to make the inverse component i1 and the inverse component i2 in the output signals of the coupled ports of the first directional coupler and the second directional coupler equal in size, namely | i1| -i2 |;
2.2.2) adjusting the phase shifter so that the reverse component i1 and the reverse component i2 in the output signals of the coupled ports of the first directional coupler and the second directional coupler are opposite in phase, i.e., i1 is-i 2.
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| CN202110423471.3A CN113156199B (en) | 2021-04-20 | 2021-04-20 | Radio frequency power measuring device and method |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02268006A (en) * | 1989-04-07 | 1990-11-01 | Yukihiro Toyoda | Directional coupler |
| JP2001221820A (en) * | 2000-02-07 | 2001-08-17 | Mitsubishi Electric Corp | Reflecting power monitor circuit |
| JP2002189045A (en) * | 2000-12-22 | 2002-07-05 | Mitsubishi Electric Corp | Reflected electric power monitor circuit and its adjusting method |
| US20100171564A1 (en) * | 2009-01-06 | 2010-07-08 | Mitsubishi Electric Corporation | Directional coupler |
| CN102025433A (en) * | 2010-12-29 | 2011-04-20 | 华为技术有限公司 | Signal detection method, detection device and detection base station |
| CN203674357U (en) * | 2013-12-10 | 2014-06-25 | 三维通信股份有限公司 | Radio frequency power synthesis and output system |
| CN103916202A (en) * | 2014-04-09 | 2014-07-09 | 大连海事大学 | Radio-frequency cable on-line fault monitoring device and monitoring method thereof |
| US20140266499A1 (en) * | 2013-03-15 | 2014-09-18 | Agilent Technologies, Inc. | Adjustable directional coupler circuit |
| US20180317288A1 (en) * | 2017-04-28 | 2018-11-01 | Nxp Usa, Inc. | Power measurement via bond wire coupling |
| EP3584962A1 (en) * | 2014-09-11 | 2019-12-25 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and apparatus for facilitating antenna calibration and transceiver |
| CN112327081A (en) * | 2020-10-30 | 2021-02-05 | 中国科学院高能物理研究所 | Power testing device and method for rectangular waveguide directional coupler |
-
2021
- 2021-04-20 CN CN202110423471.3A patent/CN113156199B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02268006A (en) * | 1989-04-07 | 1990-11-01 | Yukihiro Toyoda | Directional coupler |
| JP2001221820A (en) * | 2000-02-07 | 2001-08-17 | Mitsubishi Electric Corp | Reflecting power monitor circuit |
| JP2002189045A (en) * | 2000-12-22 | 2002-07-05 | Mitsubishi Electric Corp | Reflected electric power monitor circuit and its adjusting method |
| US20100171564A1 (en) * | 2009-01-06 | 2010-07-08 | Mitsubishi Electric Corporation | Directional coupler |
| CN102025433A (en) * | 2010-12-29 | 2011-04-20 | 华为技术有限公司 | Signal detection method, detection device and detection base station |
| US20140266499A1 (en) * | 2013-03-15 | 2014-09-18 | Agilent Technologies, Inc. | Adjustable directional coupler circuit |
| CN104065370A (en) * | 2013-03-15 | 2014-09-24 | 安捷伦科技有限公司 | Adjustable directional coupler circuit |
| CN203674357U (en) * | 2013-12-10 | 2014-06-25 | 三维通信股份有限公司 | Radio frequency power synthesis and output system |
| CN103916202A (en) * | 2014-04-09 | 2014-07-09 | 大连海事大学 | Radio-frequency cable on-line fault monitoring device and monitoring method thereof |
| EP3584962A1 (en) * | 2014-09-11 | 2019-12-25 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and apparatus for facilitating antenna calibration and transceiver |
| US20180317288A1 (en) * | 2017-04-28 | 2018-11-01 | Nxp Usa, Inc. | Power measurement via bond wire coupling |
| CN112327081A (en) * | 2020-10-30 | 2021-02-05 | 中国科学院高能物理研究所 | Power testing device and method for rectangular waveguide directional coupler |
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