CN203275513U - Radio frequency power meter - Google Patents

Radio frequency power meter Download PDF

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Publication number
CN203275513U
CN203275513U CN 201320273564 CN201320273564U CN203275513U CN 203275513 U CN203275513 U CN 203275513U CN 201320273564 CN201320273564 CN 201320273564 CN 201320273564 U CN201320273564 U CN 201320273564U CN 203275513 U CN203275513 U CN 203275513U
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China
Prior art keywords
circuit
interface
power supply
radio frequency
microprocessor
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Expired - Fee Related
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CN 201320273564
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Chinese (zh)
Inventor
刘云龙
王勇
俞隽
王东华
贾红磊
常建丽
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HEFEI XINWEI INSTRUMENT Co Ltd
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HEFEI XINWEI INSTRUMENT Co Ltd
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Abstract

The utility model discloses a radio frequency power meter which comprises a control circuit, a built-in power supply and a detection circuit. The radio frequency power meter is characterized in that the control circuit is composed of a microprocessor which is the core, a man-machine interaction module and an external data interface. The built-in power supply is composed of a charging battery and a power supply management circuit. The charging input interface of the power supply management circuit is connected with an external charging device. The charging output interface of the power supply management circuit is connected with the charging battery. The discharging control interface of the power supply management circuit is connected with the I/O interface of the microprocessor. Positive and negative electrode plates of the charging battery are connected with the power supply interfaces of the detection circuit and the control circuit through the discharging control interface. The detection circuit is composed of a directional coupler, a filter, a radio frequency signal front end processing circuit, a detection modulation circuit, a buffer circuit and an A/D converter, wherein the directional coupler, the filter, the radio frequency signal front end processing circuit, the detection modulation circuit, the buffer circuit and the A/D converter are connected in turn. The radio frequency power meter has the advantages of wide work frequency and large dynamic range, and can bear high power.

Description

Radio frequency power meter
Technical Field
The utility model relates to an electromagnetic parameter measures technical field, concretely relates to power measurement device.
Background
Today, wireless communication penetrates into all corners of the world. 2G, 3G, 4G mobile communication networks are emerging in various countries around the world. In the installation, maintenance, construction and measurement of mobile communication networks, the development, production and maintenance activities of wireless communication equipment, a radio frequency power meter is one of the most basic test instruments. The radio frequency power meter has two types of terminal type and through type according to the connection mode in the test system. The terminal type radio frequency power meter takes a probe of the radio frequency power meter as a terminal load of a test system, the radio frequency power meter absorbs all power to be tested, and a radio frequency power indicator directly reads a power value; a through-type RF power meter features that a part of the transmitted RF power is coupled out by a coupling unit, such as directional coupler, coupling loop and probe, and then fed to RF power meter for measuring the total power transmitted by the RF power meter, which is the ratio of the indicated value of power meter multiplied by the proportional coefficient.
Compared with a terminal type (thermocouple type) radio frequency power meter, the forward power and reflected power conditions of a transmitting system are truly reflected by the through type radio frequency power meter, and therefore the through type radio frequency power meter is widely applied to the field of radio frequency power measurement. The existing through type radio frequency power meter has the following defects: the frequency band is narrow, when the working frequency required to be tested by a user is wide, different radio frequency power meters need to be equipped, the use is inconvenient, the average power can only be measured, and the requirement of fast-developing mobile communication cannot be met. .
Disclosure of Invention
In view of the deficiency of the prior art, the utility model provides a radio frequency power meter, this radio frequency power meter has that operating frequency is wide, and dynamic range is big, can bear the big advantage of power.
The utility model provides a technical scheme as follows of above-mentioned problem:
a radio frequency power meter comprises a control circuit, a built-in power supply and a detection circuit, and is characterized in that,
the control circuit is composed of a microprocessor as a core, a man-machine interaction module and an external data interface, wherein the man-machine interaction module comprises a miniature keyboard and a display module which are respectively connected to the microprocessor, the external data interface is a data interface circuit which accords with an RS232 industrial serial data interface standard and a USB serial data bus standard, and a data receiving and transmitting port of the data interface circuit is respectively connected with a data interface of the microprocessor;
the built-in power supply consists of a rechargeable battery and a power supply management circuit, wherein a charging input interface of the power supply management circuit is connected with an external charging device, a charging output interface of the power supply management circuit is connected with the rechargeable battery, and a discharging control interface of the power supply management circuit is connected with an I/O interface of the microprocessor; the positive and negative plates of the rechargeable battery are connected with the power supply interfaces of the detection circuit and the control circuit through the discharge control interface;
the detection circuit consists of a directional coupler, a filter, a radio-frequency signal front-end processing circuit, a detection modulation circuit, a buffer circuit and an A/D converter which are connected in sequence, wherein the directional coupler is a two-port directional coupler, and the output end of the directional coupler is connected to the signal input end of the radio-frequency signal front-end processing circuit through the filter; the radio frequency signal front-end processing circuit is a radio frequency channel selection circuit, and a radio frequency signal selection control end of the radio frequency channel selection circuit is connected with an I/O interface of the microprocessor; the detection modulation circuit consists of a broadband high-precision peak detection chip and a peripheral circuit thereof, wherein the radio-frequency signal input end of the detection modulation circuit is connected with the radio-frequency signal output end of the radio-frequency signal front-end processing circuit, and the modulation signal output end of the detection modulation circuit is connected with the signal input end of the buffer circuit; the signal output end of the buffer circuit is connected with the analog voltage input end of the A/D converter, and the digital signal output end of the A/D converter is connected with the I/O interface of the microprocessor.
In order to improve the performance of the radio frequency power meter of the present invention, the microprocessor may adopt a high-speed microprocessor of an ARM architecture;
for improving the precision of the radio frequency power meter for detecting the radio frequency power, the A/D converter can adopt a 14-bit high-speed A/D converter.
Compared with the prior art, because the utility model discloses a peak detection chip of broadband high accuracy accomplishes the power detection, and this chip turns into voltage signal with forward power and reflected power, and the system then handles this signal through digital acquisition and processing chip, and the analysis obtains mean value forward power, peak power, reverse power, each item test parameter such as CCDF, has that operating frequency is wide, and dynamic range is big, can bear the big advantage of power.
Drawings
Fig. 1 is a block diagram of a circuit structure of an embodiment of the rf power meter according to the present invention.
FIG. 2 is a block diagram of the control circuit of FIG. 1;
fig. 3 is a block diagram of the circuit configuration of the detector circuit shown in fig. 1.
Detailed Description
Referring to fig. 1, the rf power meter according to the present embodiment includes a control circuit, a built-in power supply, and a detector circuit. Wherein,
as shown in fig. 2, the control circuit is formed by taking an ARM11 type microprocessor of ARMv6 architecture with model number S3C6410, manufactured by samsung corporation of korea, as a core, and matching with a human-computer interaction module and an external data interface, wherein the human-computer interaction module comprises a micro keyboard and a liquid crystal display module which are respectively connected to the ARM11 type microprocessor, the external data interface is a data interface circuit which conforms to the RS-232 industrial serial data interface standard and the USB serial data bus standard, and a data transceiving port of the data interface circuit is respectively connected with a data interface of the ARM11 type microprocessor;
the built-in power supply consists of a lithium ion rechargeable battery and a power supply management circuit, wherein a charging input interface of the power supply management circuit is connected with an external charging device, a charging output interface of the power supply management circuit is connected with the lithium ion rechargeable battery, and a discharging control interface of the power supply management circuit is connected with an I/O interface of an ARM11 type microprocessor; the positive and negative plates of the lithium ion rechargeable battery are connected with the power supply interfaces of the detection circuit and the control circuit through the discharge control interface;
referring to fig. 3, the detection circuit is composed of a directional coupler, an RC filter, a radio frequency signal front-end processing circuit, a detection modulation circuit, a buffer circuit, and a 14-bit high-speed a/D converter, which are connected in sequence, wherein the directional coupler is a two-port directional coupler U1, and an output end of the directional coupler is connected to a signal input end of the radio frequency signal front-end processing circuit through the RC filter composed of a resistor R2 and a capacitor C1; the radio frequency signal front-end processing circuit is a radio frequency channel selection circuit, and a radio frequency signal selection control end of the radio frequency channel selection circuit is connected with an I/O interface of the ARM11 type microprocessor; the detection modulation circuit consists of a broadband high-precision peak detection chip and a peripheral circuit thereof, wherein the radio-frequency signal input end of the detection modulation circuit is connected with the radio-frequency signal output end of the radio-frequency signal front-end processing circuit, and the modulation signal output end of the detection modulation circuit is connected with the signal input end of the buffer circuit; the buffer circuit is a voltage follower circuit with level conversion function, and the circuit consists of a high-speed integrated operational amplifier U2 with the model number AD8009 manufactured by ADI company in America and peripheral circuits thereof; the signal output end of the buffer circuit is connected with the analog voltage input end of the 14-bit high-speed A/D converter, and the digital signal output end of the 14-bit high-speed A/D converter is connected with the I/O interface of the ARM11 type microprocessor.
The radio frequency power meter in this example works as follows:
firstly, a measuring signal enters an input port of a double-port directional coupler, a part of signal is coupled out from a forward transmitting signal and a reflected signal through the double-port directional coupler for power measurement, the coupled radio-frequency signal is input to a signal input end of a radio-frequency signal front-end processing circuit after being subjected to RC filtering, an ARM11 type microprocessor controls the radio-frequency signal front-end processing circuit according to the working state of a power meter, a radio-frequency output channel is selected, the output radio-frequency signal is modulated into a baseband signal through a detection modulation circuit, and then is output to a 14-bit high-speed A/D converter after being buffered, level-converted and isolated through a buffer circuit, and the 14-bit high-speed A/D converter completes analog-to-digital conversion, the ARM11 type microprocessor analyzes and processes the converted digital signals, accurately completes the related test and calculation of the radio frequency power, and sends the related data to the liquid crystal display module for display.
Because the utility model discloses built-in lithium ion rechargeable battery, this type of battery energy density is big, can guarantee long-time off-line and use for this dynamometer has advantages such as small, light in weight, easily carry, function are strong.

Claims (3)

1. A radio frequency power meter comprises a control circuit, a built-in power supply and a detection circuit, and is characterized in that,
the control circuit is composed of a microprocessor as a core, a man-machine interaction module and an external data interface, wherein the man-machine interaction module comprises a miniature keyboard and a display module which are respectively connected to the microprocessor, the external data interface is a data interface circuit which accords with an RS232 industrial serial data interface standard and a USB serial data bus standard, and a data receiving and transmitting port of the data interface circuit is respectively connected with a data interface of the microprocessor;
the built-in power supply consists of a rechargeable battery and a power supply management circuit, wherein a charging input interface of the power supply management circuit is connected with an external charging device, a charging output interface of the power supply management circuit is connected with the rechargeable battery, and a discharging control interface of the power supply management circuit is connected with an I/O interface of the microprocessor; the positive and negative plates of the rechargeable battery are connected with the power supply interfaces of the detection circuit and the control circuit through the discharge control interface;
the detection circuit consists of a directional coupler, a filter, a radio-frequency signal front-end processing circuit, a detection modulation circuit, a buffer circuit and an A/D converter which are connected in sequence, wherein the directional coupler is a two-port directional coupler, and the output end of the directional coupler is connected to the signal input end of the radio-frequency signal front-end processing circuit through the filter; the radio frequency signal front-end processing circuit is a radio frequency channel selection circuit, and a radio frequency signal selection control end of the radio frequency channel selection circuit is connected with an I/O interface of the microprocessor; the detection modulation circuit consists of a broadband high-precision peak detection chip and a peripheral circuit thereof, wherein the radio-frequency signal input end of the detection modulation circuit is connected with the radio-frequency signal output end of the radio-frequency signal front-end processing circuit, and the modulation signal output end of the detection modulation circuit is connected with the signal input end of the buffer circuit; the signal output end of the buffer circuit is connected with the analog voltage input end of the A/D converter, and the digital signal output end of the A/D converter is connected with the I/O interface of the microprocessor.
2. The rf power meter of claim 1, wherein the microprocessor is an ARM architecture high speed microprocessor.
3. The rf power meter of claim 1, wherein the a/D converter is a 14-bit high-speed a/D converter.
CN 201320273564 2013-05-20 2013-05-20 Radio frequency power meter Expired - Fee Related CN203275513U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN 201320273564 CN203275513U (en) 2013-05-20 2013-05-20 Radio frequency power meter

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104515901A (en) * 2014-12-11 2015-04-15 国家无线电监测中心检测中心 Radio frequency power detecting device and method
CN106353585A (en) * 2016-10-20 2017-01-25 成都前锋电子仪器有限责任公司 Data processing circuit used for radio frequency power reflectometer
CN106405219A (en) * 2016-10-20 2017-02-15 成都前锋电子仪器有限责任公司 Radio-frequency power reflectometer
CN106771550A (en) * 2016-11-15 2017-05-31 中国电子科技集团公司第四十研究所 A kind of single probe microwave power measurement device and method with display
CN110632533A (en) * 2019-08-08 2019-12-31 苏州博维仪器科技有限公司 Power detection system of RF (radio frequency) power supply

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104515901A (en) * 2014-12-11 2015-04-15 国家无线电监测中心检测中心 Radio frequency power detecting device and method
CN106353585A (en) * 2016-10-20 2017-01-25 成都前锋电子仪器有限责任公司 Data processing circuit used for radio frequency power reflectometer
CN106405219A (en) * 2016-10-20 2017-02-15 成都前锋电子仪器有限责任公司 Radio-frequency power reflectometer
CN106771550A (en) * 2016-11-15 2017-05-31 中国电子科技集团公司第四十研究所 A kind of single probe microwave power measurement device and method with display
CN110632533A (en) * 2019-08-08 2019-12-31 苏州博维仪器科技有限公司 Power detection system of RF (radio frequency) power supply
CN110632533B (en) * 2019-08-08 2022-09-27 苏州博维仪器科技有限公司 Power detection system of RF (radio frequency) power supply

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131106

Termination date: 20180520

CF01 Termination of patent right due to non-payment of annual fee