CN113156199B - Radio frequency power measuring device and method - Google Patents
Radio frequency power measuring device and method Download PDFInfo
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- CN113156199B CN113156199B CN202110423471.3A CN202110423471A CN113156199B CN 113156199 B CN113156199 B CN 113156199B CN 202110423471 A CN202110423471 A CN 202110423471A CN 113156199 B CN113156199 B CN 113156199B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000008878 coupling Effects 0.000 claims abstract description 27
- 238000010168 coupling process Methods 0.000 claims abstract description 27
- 238000005859 coupling reaction Methods 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
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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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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention relates to a radio frequency power measuring device and a method, which are characterized by comprising the following steps: the power measuring device comprises a first directional coupler, a second directional coupler, a synthesizer, a power adjusting 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; isolation ports of the first directional coupler and the second directional coupler are connected with a matched load; the 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 in series between the first directional coupler or the second directional coupler and the synthesizer; and an 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 a radio frequency power measuring method, and belongs to the field of radio frequency power measurement.
Background
The directional coupler is a universal microwave/millimeter wave component and can be used for signal isolation, separation and mixing, such as power monitoring, source output power amplitude stabilization, signal source isolation, transmission and reflection sweep frequency test and the like. In recent years, radio frequency power measurement based on a directional coupler 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 insufficient directivity of the directional coupler, crosstalk between forward and reverse signals can cause larger error in forward and reverse power measurement, and thus output power of the radio frequency power source and reflected power reflected from the load end cannot be accurately calibrated.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a radio frequency power measuring device and a radio frequency power measuring method, which can quickly and conveniently measure radio frequency power and have high accuracy of measuring results.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a radio frequency power measurement device comprising:
the power measuring device comprises a first directional coupler, a second directional coupler, a synthesizer, a power adjusting 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;
isolation ports of the first directional coupler and the second directional coupler are connected with a matched load;
the 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 in series between the first directional coupler or the second directional coupler and the synthesizer;
and an output port of the synthesizer is connected with the power measuring device.
Further, the power adjusting device comprises an attenuator and a phase shifter, wherein the phase shifter is used for adjusting the direction of a forward signal or a reflected signal in a 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, there is provided a radio frequency power measurement method, comprising the steps of:
1) The first directional coupler and the second directional coupler are connected in series in a radio frequency circuit to be tested, and are connected with a power regulating device, a synthesizer and a power measuring device;
2) The output signal of the combiner output port is obtained through the power measuring device, and the output signal of the coupling port of the first directional coupler is regulated through the power regulating device, so that the output signal of the combiner output port is only related to the forward signal or the reflected signal in the radio frequency circuit to be tested.
Further, in the step 2), the method for obtaining the output signal of the output port of the synthesizer 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 using a power measuring device, wherein the output signal comprises a forward component c1 and a reverse component i1 which are output by a coupling port of a first directional coupler, and a forward component c2 and a reverse component i2 which are output by a coupling port of a second directional coupler, wherein the phase angles of the forward component c1 and the reverse component i1 are as followsThe 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 The power adjustment device is adjusted so that the output signal of the synthesizer output port is only related to the forward signal or the reverse signal in the radio frequency line to be measured.
Further, in the step 2.2), the method for adjusting the power adjusting device includes the following steps:
2.2.1 The attenuator is adjusted, so that the reverse component i1 and the reverse component i2 in the output signals of the coupling ports of the first directional coupler and the second directional coupler are equal in size, namely |i1|= |i2|;
2.2.2 The phase shifter is adjusted so that the reverse component i1 and the reverse component i2 in the output signals of the coupling ports of the first directional coupler and the second directional coupler are opposite in phase, namely, i1= -i2.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the directivity requirements of the two adopted directional couplers are common, so that the design and manufacturing process requirements of the directional couplers for radio frequency power measurement can be greatly reduced. 2. The invention can realize high-precision measurement 3 of the radio frequency power when the directional coupler has poor directivity, has simple debugging and measuring processes, has general technological requirements on all the adopted components and parts, and has 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 the coupler 1 and the coupler 2 in the present invention;
FIG. 3 is a schematic diagram of the output signal after passing through an attenuator in the present invention;
FIG. 4 is a schematic diagram of the output signal after passing through the phase shifter in the present invention;
FIG. 5 is a schematic diagram of the synthesizer output signals of the present invention;
fig. 6 is a schematic diagram of a relationship between a power measurement error and a position change of a sliding short circuit piece according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the radio frequency power measurement device provided by the present invention includes: a directional coupler 1, a directional coupler 2, a combiner 3, a power regulating device and a 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; the 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 connected in series between the directional coupler 1 or the directional coupler 2 and the synthesizer 3; the output port of synthesizer 3 is connected to a power measurement device.
Further, the power adjusting device includes an attenuator 4 and a phase shifter 5, wherein the phase shifter 5 is used to adjust the direction of the 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 to adjust 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 tested, and are connected with the synthesizer 3, the power regulating device and the power measuring device.
As shown in fig. 1, a directional coupler 1 and a directional coupler 2 are connected with a radio frequency line to be measured, in the figure,is the phase difference between the directional coupler 1 and the directional coupler 2; v (V) + And V-are the forward signal and the reverse signal, respectively, in the RF line under test, P + And P-is the forward power and the reverse power in the RF line to be measured, respectively.
2) Acquisition of output signal V of synthesizer 3 output port by power measuring device T And outputs the signal V to the coupling port of the directional coupler 2 through the power adjusting device 2 Regulated so that the output signal V of the output port of synthesizer 3 T Only with the forward signal V in the radio frequency line to be measured + Or the inverse signal V-correlation.
Specifically, the method comprises the following steps:
2.1 Acquiring synthesizer 3 output port using power measuring deviceOutput signal V of (2) T The output signal V T Comprising a forward component c1 and a reverse component i1 of the coupling port output of the directional coupler 1, a forward component c2 and a reverse component i2 of the coupling port output of the directional coupler 2, wherein the phase angle of the forward component c1 and the reverse component i1 isThe 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 The power regulating device is regulated so that the output signal of the output port of the synthesizer 3 is only related to the forward signal or the reverse signal in the radio frequency line to be measured.
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 output signals of the coupling ports of the directional coupler 1 and the directional coupler 2 are equal in size, i.e., |i1|= |i2|.
2.2.2 As shown in fig. 4), the phase shifter 5 is adjusted so that the reverse component i1 and the reverse component i2 in the output signals of the coupling ports of the directional coupler 1 and the directional coupler 2 are opposite in phase, i.e., i1= -i2.
At this time, as shown in fig. 5, the outputs from the opposite components in the two input signals of the synthesizer 3 to the synthesizing end cancel each other, and the output port of the synthesizer 3 will only have the forward signal component. At this time, the signal extracted by the synthesis port is only related to the forward signal in the line to be detected, but not related to the reflected signal, so that accurate measurement of the forward signal or the reflected signal in the radio frequency line to be detected can be realized.
Example 1
As shown in fig. 1, in this embodiment, the incident power from the transmitter in the radio frequency circuit to be testedAbout 5kW, a frequency of 162.5MHz, a load termination with a slidable short-circuit, directivities of the directional coupler 1 and the directional coupler 2 of 26dB and 28dB, respectively, and maximum errors in power measurement at total reflection of 10.3% and 9.7%, respectively. Changing the phase difference between coupler 1 and coupler 2 by changing the position of the shorting tab of the sliding shorting device during testingResulting in a power measurement error at one period phase difference.
As shown in fig. 6, in the experimental measurement result, the relation between the power measurement error and the position of the short-circuit piece of the sliding short-circuit device is that the maximum error is about 1.7%, which is far smaller than the measurement error of the single directional coupler, so that the high-precision measurement of the radio frequency power in the radio frequency circuit is realized.
The foregoing embodiments are only for illustrating the present invention, wherein the structures, connection modes, manufacturing processes, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.
Claims (4)
1. A radio frequency power measurement device, comprising:
the power measuring device comprises a first directional coupler, a second directional coupler, a synthesizer, a power adjusting 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;
isolation ports of the first directional coupler and the second directional coupler are connected with a matched load;
the 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 in series between the first directional coupler or the second directional coupler and the synthesizer;
the output port of the synthesizer is connected with the power measuring device;
the power adjusting device comprises an attenuator and a phase shifter, wherein the phase shifter is used for adjusting the direction of a forward signal or a reflected signal in a 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, so that the output signal of the output port of the synthesizer is only related to the forward signal or the reflected signal in a radio frequency circuit to be tested.
2. A method of radio frequency power measurement employing the apparatus of claim 1, comprising the steps of:
1) The first directional coupler and the second directional coupler are connected in series in a radio frequency circuit to be tested, and are connected with a power regulating device, a synthesizer and a power measuring device;
2) The output signal of the combiner output port is obtained through the power measuring device, and the output signal of the coupling port of the first directional coupler is regulated through the power regulating device, so that the output signal of the combiner output port is only related to the forward signal or the reflected signal in the radio frequency circuit to be tested.
3. The method for measuring radio frequency power according to claim 2, wherein in the step 2), the output signal of the output port of the combiner is obtained by a power measuring device, and the output signal of the coupling port of the first directional coupler is adjusted by a power adjusting device, and the method comprises the following steps:
2.1 Acquiring an output signal of an output port of the synthesizer by using a power measuring device, wherein the output signal comprises a forward component c1 and a reverse component i1 which are output by a coupling port of a first directional coupler, and a forward component c2 and a reverse component i2 which are output by a coupling port of a second directional coupler, wherein the phase angles of the forward component c1 and the reverse component i1 are as followsThe 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 The power adjustment device is adjusted so that the output signal of the synthesizer output port is only related to the forward signal or the reverse signal in the radio frequency line to be measured.
4. A method for measuring radio frequency power according to claim 3, wherein in said step 2.2), the method for adjusting the power adjusting device comprises the steps of:
2.2.1 The attenuator is adjusted, so that the reverse component i1 and the reverse component i2 in the output signals of the coupling ports of the first directional coupler and the second directional coupler are equal in size, namely |i1|= |i2|;
2.2.2 The phase shifter is adjusted so that the reverse component i1 and the reverse component i2 in the output signals of the coupling ports of the first directional coupler and the second directional coupler are opposite in phase, namely, i1= -i2.
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|---|---|---|---|---|
| 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 |
| 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 |
| CN104065370A (en) * | 2013-03-15 | 2014-09-24 | 安捷伦科技有限公司 | Adjustable directional coupler circuit |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5169844B2 (en) * | 2009-01-06 | 2013-03-27 | 三菱電機株式会社 | Directional coupler |
| US10412795B2 (en) * | 2017-04-28 | 2019-09-10 | Nxp Usa, Inc. | Power measurement via bond wire coupling |
-
2021
- 2021-04-20 CN CN202110423471.3A patent/CN113156199B/en active Active
Patent Citations (9)
| 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 |
| 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 |
| 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 |
| 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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