CN217741725U - Miniaturized cable and radio frequency port measuring device - Google Patents
Miniaturized cable and radio frequency port measuring device Download PDFInfo
- Publication number
- CN217741725U CN217741725U CN202221073277.3U CN202221073277U CN217741725U CN 217741725 U CN217741725 U CN 217741725U CN 202221073277 U CN202221073277 U CN 202221073277U CN 217741725 U CN217741725 U CN 217741725U
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- output end
- power divider
- frequency switch
- amplification unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a miniaturized cable and radio frequency port measuring device relates to radio communication technical field. The utility model comprises a signal source generator unit, a radio frequency channel filter unit, a directional coupling amplification unit and a mixing filter amplification unit, wherein the signal source generator unit is connected with the radio frequency channel filter unit, and the radio frequency channel filter unit is connected with an input port of a first power divider; one output end of the first power divider is connected with the directional coupling amplification unit, and the other output end of the first power divider is connected with the frequency mixing filtering amplification unit; one output end of the directional coupling amplification unit is connected with the feeder line interface, and the other output end of the directional coupling amplification unit is connected with the input port of the second power divider; one output end of the second power divider is connected with the frequency mixing filtering amplification unit, and the other output end of the second power divider is connected with the detector; the MCU display is connected with the output ends of the mixing filtering amplification unit and the detector. The utility model discloses can be through the fault point location of multiple mode with more accurate, swift realization cable, and the index test of antenna feeder port.
Description
Technical Field
The utility model relates to a radio communication technology field, more specifically say, relate to a miniaturized cable and radio frequency port measuring device.
Background
At present, with the rapid development of radio communication technology, wireless communication uses more and more, such as mobile base station, thing networking, unmanned aerial vehicle, fields such as military communication. The wireless communication has the characteristics of long communication distance, strong maneuverability and the like, and is widely applied to data transmission, particularly in the military field.
The antenna feeder line as the connecting line of the transceiver is an important component of wireless communication, and the excellent matching of the antenna feeder line and the connecting line directly influences the communication quality. Therefore, it is necessary to develop a measuring device capable of automatically measuring the characteristics of the wireless communication cable and the rf port of the antenna feeder with high accuracy and efficiency.
The research of home and abroad fault location has been developed for a long Time, and at present, the research mainly includes a Time Domain Reflectometry (TDR Time Domain Reflectometry) and a Frequency Domain Reflectometry (FDR Frequency Domain Reflectometry) in principle. TDR is to send high-speed signal to the feeder line, and the signal will produce the reflection after meeting the fault point, confirms the fault point distance through confirming incident signal and reflection signal time difference and travelling wave speed.
However, the extraction of the high-frequency traveling wave close to the speed of light has high requirements on hardware, and the whole device has high cost. Meanwhile, the positioning accuracy of the traveling wave method is easily influenced by the uncertainty of the fault traveling wave, the difficulty in identifying the fault traveling wave emission wave and the influence factors of the frequency change and the wave speed of the parameters. In addition, the time domain reflectometry TDR has the following disadvantages: (1) a finite rise time; (2) synchronous dithering of the samplers; (3) poor signal-to-noise ratio; (4) large step voltages can damage active devices; (5) a direct current path is required.
FDR frequency domain reflectometry is a technique in which a frequency sweep test signal of a specific frequency range is transmitted, reflected signals of the same frequency as the transmitted signal but different time periods are generated at a fault point, the signals are analyzed by means of fourier transform, and the distance to the line fault point is calculated by measuring the frequency of the peak of the reflected signal. Compared with TDR, FDR technology has two main advantages: the circuit is relatively simple, and the equipment cost is not high; (2) FDRs are more suitable for testing high frequency circuits.
However, in the prior art, a certain index of the antenna feeder can be measured only in a single mode, and the cause of the problem cannot be deeply analyzed. For example, patent No. 202121173817.0 discloses a radio frequency cable fault detector, and this application includes a frequency synthesis module, an envelope detection module, a signal conditioning module and a first control module, wherein the output end of the frequency synthesis module is connected with one end of a cable to be detected, the other end of the cable to be detected is connected with the input end of the envelope detection module, and the output end of the envelope detection module is connected with the first control module through the signal conditioning module. Although this application can test radio frequency cable's break-make and loss, still the problem of measurement mode singleness.
Disclosure of Invention
1. Technical problem to be solved by the invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a miniaturized cable and radio frequency port measuring device; the utility model discloses can be through the fault point location of multiple mode with more accurate, swift realization cable, and the index test of antenna feeder port.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model discloses a miniaturized cable and radio frequency port measuring device, including signal source generator unit, radio frequency channel filter unit, directional coupling amplification unit and mixing filter amplification unit, signal source generator unit connection radio frequency channel filter unit, radio frequency channel filter unit connects the input port of first merit divider; one output end of the first power divider is connected with the directional coupling amplification unit, and the other output end of the first power divider is connected with the frequency mixing filtering amplification unit; one output end of the directional coupling amplification unit is connected with the feeder interface, and the other output end of the directional coupling amplification unit is connected with the input port of the second power divider; one output end of the second power divider is connected with the frequency mixing filtering amplification unit, and the other output end of the second power divider is connected with the detector; the MCU display is connected with the output ends of the mixing filtering amplification unit and the detector.
Furthermore, the signal source generator unit comprises a crystal oscillator, a frequency synthesizer, a first radio frequency switch, a DDS synthesizer, a second radio frequency switch and a first amplifier, wherein the crystal oscillator is connected with the frequency synthesizer, the output end of the frequency synthesizer is connected with the first radio frequency switch, one output end of the first radio frequency switch is connected with the second radio frequency switch, and the other output end of the first radio frequency switch is connected with the DDS synthesizer; the output end of the DDS synthesizer is connected with the second radio frequency switch, the input end of the first amplifier is connected with the output end of the second radio frequency switch, and the output end of the first amplifier is connected with the radio frequency channel filtering unit.
Furthermore, the rf channel filtering unit includes a third rf switch, a first channel filter bank, a second channel filter bank, and a fourth rf switch. The input end of the third radio frequency switch is connected with the output end of the first amplifier, one output end of the third radio frequency switch is connected with the first channel filter bank, the other output end of the third radio frequency switch is connected with the second channel filter bank, the output ends of the first channel filter bank and the second channel filter bank are connected with the fourth radio frequency switch, and the output end of the fourth radio frequency switch is connected with the first power divider.
Furthermore, the directional coupling amplifying unit includes a directional coupler and a second amplifier, one output terminal of the first power divider is connected to the directional coupler, one output terminal of the directional coupler is connected to the feeder interface, the other output terminal of the directional coupler is connected to the second amplifier, and the output terminal of the second amplifier is connected to the second power divider.
Furthermore, the mixing filtering amplifying unit includes a mixer, a filter and a third amplifier, the other output terminal of the first power divider and one output terminal of the second power divider are connected to the mixer, the mixer is connected to the filter, the output terminal of the filter is connected to the third amplifier, and the third amplifier is connected to the MCU display.
Furthermore, the signal source generator unit outputs a broadband signal of 100KHz-4400MHz, and the minimum step is 1KHz.
Furthermore, the first radio frequency switch, the second radio frequency switch, the third radio frequency switch and the fourth radio frequency switch all adopt broadband alternative switches.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following apparent effect:
(1) The utility model discloses a miniaturized cable and radio frequency port measuring device, the test speed is fast, the measuring speed reaches 200 points/second; the device has wide frequency measurement range which can reach 100KHz-4.4GHz and basically covers the test requirements of most cables and radio frequency ports;
(2) The utility model discloses a miniaturized cable and radio frequency port measuring device, measuring method is many, can measure the fault distance of cable through time domain low pass algorithm or time domain band pass algorithm, can acquire the smith chart of being surveyed a radio frequency port through time domain low pass algorithm, can measure the standing-wave ratio of radio frequency port through the return loss who calculates the port.
Drawings
FIG. 1 is a schematic diagram of a miniaturized cable and RF port measurement device;
the reference numerals in the schematic drawings illustrate:
1. crystal oscillation; 2. a frequency synthesizer; 3. a first radio frequency switch; 4. a DDS synthesizer; 5. a second radio frequency switch; 6. a first amplifier; 7. a third radio frequency switch; 8. a first channel filter bank; 9. a second pass filter bank; 10. a fourth radio frequency switch; 11. a first power divider; 12. a directional coupler; 13. a second amplifier; 14. a second power divider; 15. a mixer; 16. a filter; 17. a third amplifier; 18. an MCU display; 19. a detector; 20. and a feeder line interface.
Detailed Description
For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
With reference to fig. 1, the miniaturized cable and rf port measuring device of this embodiment includes a signal source generator unit, an rf channel filter unit, a directional coupling amplifier unit, and a mixing filter amplifier unit, where the signal source generator unit is connected to the rf channel filter unit, and the rf channel filter unit is connected to an input port of a first power divider 11; one output end of the first power divider 11 is connected with the directional coupling amplification unit, and the other output end is connected with the frequency mixing filtering amplification unit; one output end of the directional coupling amplification unit is connected with the feeder interface 20, and the other output end of the directional coupling amplification unit is connected with the input port of the second power divider 14; one output end of the second power divider 14 is connected with the frequency mixing filtering amplification unit, and the other output end is connected with the detector 19; the MCU display 18 is connected with the output ends of the mixing filtering amplification unit and the detector 19.
The signal source generator unit comprises a crystal oscillator 1, a frequency synthesizer 2, a first radio frequency switch 3, a DDS synthesizer 4 (namely a direct digital frequency synthesizer), a second radio frequency switch 5 and a first amplifier 6, wherein the crystal oscillator 1 is connected with the frequency synthesizer 2, the output end of the frequency synthesizer 2 is connected with the first radio frequency switch 3, one output end of the first radio frequency switch 3 is connected with the second radio frequency switch 5, and the other output end of the first radio frequency switch 3 is connected with the DDS synthesizer 4; the output end of the DDS synthesizer 4 is connected with the second radio frequency switch 5, the input end of the first amplifier 6 is connected with the output end of the second radio frequency switch 5, and the output end of the first amplifier 6 is connected with the radio frequency channel filtering unit.
The radio frequency channel filtering unit comprises a third radio frequency switch 7, a first channel filter bank 8, a second channel filter bank 9 and a fourth radio frequency switch 10. The input end of the third radio frequency switch 7 is connected with the output end of the first amplifier 6, one output end of the third radio frequency switch 7 is connected with the first channel filter bank 8, the other output end of the third radio frequency switch is connected with the second channel filter bank 9, the output ends of the first channel filter bank 8 and the second channel filter bank 9 are connected with the fourth radio frequency switch 10, and the output end of the fourth radio frequency switch 10 is connected with the first power divider 11.
The directional coupling amplifying unit comprises a directional coupler 12 and a second amplifier 13, one output end of the first power divider 11 is connected with the directional coupler 12, one output end of the directional coupler 12 is connected with the feeder interface 20, the other output end of the directional coupler 12 is connected with the second amplifier 13, and the output end of the second amplifier 13 is connected with the second power divider 14.
The mixing filtering amplification unit comprises a mixer 15, a filter 16 and a third amplifier 17, the other output end of the first power divider 11 and one output end of the second power divider 14 are connected with the mixer 15, the mixer 15 is connected with the filter 16, the output end of the filter 16 is connected with the third amplifier 17, and the third amplifier 17 is connected with the MCU display 18.
The signal source generator unit in this embodiment is used for emitting broadband radio frequency signals, and can output broadband signals of 100KHz-4400MHz, and the minimum step is 1KHz. The radio frequency channel filtering unit is used for filtering harmonic waves and other stray signals of signals emitted by the signal source generator unit, so that output signals become purer, and the accuracy of measuring results is improved. The power divider comprises a first power divider 11 and a second power divider 14 for equally dividing power signals.
The directional coupling amplifying unit is used for acquiring the reflected input power of the feeder line interface 20; the frequency mixing filtering amplification unit performs frequency mixing on the signal emitted by the signal source generator unit and the signal reflected by the feeder line interface 20 to obtain an intermediate frequency signal; the detector 19 is used for detecting the power of the reflected signal; the MCU display 18 samples the measurement result signal through the ADC inside the chip, and displays the calculation result after calculation.
The function implementation process of this embodiment is specifically as follows:
(1) The MCU display 18 is utilized to set parameters of the signal source generator unit, such as the starting frequency, the terminating frequency, the scanning step, the scanning interval time and the like, for sending the radio frequency signals through the touch display, and signal gating is carried out on the radio frequency channel filtering unit, wherein the setting range of the starting frequency and the terminating frequency is 50MHz-2000MHz, the starting frequency is less than the terminating frequency, the setting range of the scanning interval time is 0.05s-2s, and the setting range of the step is 10KHz-2MHz.
The recommended values of the parameters are shown in table 1, and generally, the farther the distance is, the smaller the step size is, and the narrower the bandwidth is. The higher the terminated spectrum, the higher the measurement accuracy.
TABLE 1
(2) The broadband frequency sweeping signal emitted by the signal source generator unit is filtered by the radio frequency channel filtering unit and then is subjected to power division by the first power divider 11, one path of signal is sent to the mixer 15 to be mixed with the reflected signal, the other path of signal is emitted through the directional coupling amplifying unit and the feeder line interface 20, and the power of the two paths of signal is equal.
(3) The broadband sweep frequency signal reaches the tested feeder line after passing through the directional coupling amplifying unit and the feeder line interface 20, the radio frequency signal reflected from the tested feeder line is subjected to power division through the second power divider 14, one path of signal is sent to the mixer 15 to be mixed with the transmitting signal, the other path of signal reaches the detector 19, and the power of the two paths of signal is equal.
(4) The MCU display 18 samples the output signals of the mixer filter amplifier unit and the detector 19 and performs data processing.
(5) Repeating the steps 2 to 4 until the output frequency of the signal source generator unit reaches the end frequency, and ending the frequency sweep;
the sweep interval time is set by the MCU display 18 to the signal source generator unit, which executes the sweep, and the signal source generator unit increases the output frequency from the start value by the sweep interval time according to the range value set by the MCU display 18, which is the set step amount.
(6) After the frequency sweep is finished, the MCU display 18 can calculate the fault distance of the cable, the standing-wave ratio of the port of the tested piece, and the smith chart of the port of the tested piece by using the sampled data (the measurement must set the starting frequency equal to the scanning step), and the steps are as follows:
the first step is as follows: performing inverse Fourier transform (IFFT) on the direct current component output by the mixing filtering amplification unit and performing time window filtering;
the second step is that: and drawing a curve of the data after IFFT and filtering according to the fact that the distance between each point on the cable and the detection device is a horizontal axis and the reflection voltage of each point on the cable is a vertical axis. The peak value of the curve is the position of the cable fault point, the ordinate value of the point represents the reflection voltage of the cable fault point, and the inductive reactance and capacitive reactance information in the cable or the tested piece and the connection position and distance information of the inductive reactance and the capacitive reactance information in the cable or the tested piece can be obtained by analyzing the reflection voltage value and the duration of each time period, so that a Smith chart for drawing the port of the tested piece is obtained.
The third step: calculating the difference R1 (X) -R2 (X) of the direct-current signal conversion power value R1 (X) of the detector 19 sampled when the detected piece is not detected and the direct-current signal conversion power value R2 (X) of the detector 19 sampled when the detected piece is connected, so that the return loss of the detected piece at the point X can be obtained, and meanwhile, the standing wave ratio of the detected piece at the point X can also be obtained, wherein X represents the current frequency point of measurement;
the embedded software system controls the normal work of the hardware system circuit, data acquisition and calculation and the control of the touch display function.
The miniaturized cable and radio frequency port measuring device has the advantages that the testing speed is high, and the measuring speed reaches 200 points/second; the device has wide frequency measurement range which can reach 100KHz-4.4GHz and basically covers the test requirements of most cables and radio frequency ports; the fault distance of the cable can be measured through a time domain low-pass algorithm or a time domain band-pass algorithm, a Smith chart of a radio frequency port of a tested piece can be obtained through the time domain low-pass algorithm, the standing-wave ratio of the radio frequency port can be measured through calculating the return loss of the port, and the number of measurement modes is large.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (7)
1. The utility model provides a miniaturized cable and radio frequency port measuring device which characterized in that: the device comprises a signal source generator unit, a radio frequency channel filtering unit, a directional coupling amplification unit and a mixing filtering amplification unit, wherein the signal source generator unit is connected with the radio frequency channel filtering unit, and the radio frequency channel filtering unit is connected with an input port of a first power divider (11); one output end of the first power divider (11) is connected with the directional coupling amplification unit, and the other output end of the first power divider is connected with the frequency mixing filtering amplification unit; one output end of the directional coupling amplification unit is connected with the feeder interface (20), and the other output end of the directional coupling amplification unit is connected with the input port of the second power divider (14); one output end of the second power divider (14) is connected with the mixing filtering amplification unit, and the other output end of the second power divider is connected with the detector (19); the MCU display (18) is connected with the output ends of the mixing filtering amplification unit and the detector (19).
2. The miniaturized cable and RF port measurement device of claim 1, wherein: the signal source generator unit comprises a crystal oscillator (1), a frequency synthesizer (2), a first radio frequency switch (3), a DDS synthesizer (4), a second radio frequency switch (5) and a first amplifier (6), wherein the crystal oscillator (1) is connected with the frequency synthesizer (2), the output end of the frequency synthesizer (2) is connected with the first radio frequency switch (3), one output end of the first radio frequency switch (3) is connected with the second radio frequency switch (5), and the other output end of the first radio frequency switch is connected with the DDS synthesizer (4); the output end of the DDS synthesizer (4) is connected with the second radio frequency switch (5), the input end of the first amplifier (6) is connected with the output end of the second radio frequency switch (5), and the output end of the first amplifier (6) is connected with the radio frequency channel filtering unit.
3. The miniaturized cable and RF port measurement device of claim 2, wherein: the radio frequency channel filtering unit comprises a third radio frequency switch (7), a first channel filter bank (8), a second channel filter bank (9) and a fourth radio frequency switch (10); the input end of the third radio frequency switch (7) is connected with the output end of the first amplifier (6), one output end of the third radio frequency switch (7) is connected with the first channel filter bank (8), the other output end of the third radio frequency switch is connected with the second channel filter bank (9), the output ends of the first channel filter bank (8) and the second channel filter bank (9) are connected with the fourth radio frequency switch (10), and the output end of the fourth radio frequency switch (10) is connected with the first power divider (11).
4. The miniaturized cable and RF port measurement device of claim 3, wherein: the directional coupling amplification unit comprises a directional coupler (12) and a second amplifier (13), one output end of the first power divider (11) is connected with the directional coupler (12), one output end of the directional coupler (12) is connected with the feeder line interface (20), the other output end of the directional coupler (12) is connected with the second amplifier (13), and the output end of the second amplifier (13) is connected with the second power divider (14).
5. The miniaturized cable and RF port measurement device of claim 4, wherein: the mixing filtering amplification unit comprises a mixer (15), a filter (16) and a third amplifier (17), the other output end of the first power divider (11) and one output end of the second power divider (14) are connected with the mixer (15), the mixer (15) is connected with the filter (16), the output end of the filter (16) is connected with the third amplifier (17), and the third amplifier (17) is connected with the MCU display (18).
6. The miniaturized cable and RF port measurement device of claim 5, wherein: the signal source generator unit outputs 100KHz-4400MHz broadband signals, and the minimum step is 1KHz.
7. The miniaturized cable and RF port measurement device of claim 6, wherein: the first radio frequency switch (3), the second radio frequency switch (5), the third radio frequency switch (7) and the fourth radio frequency switch (10) are all broadband alternative switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221073277.3U CN217741725U (en) | 2022-05-06 | 2022-05-06 | Miniaturized cable and radio frequency port measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221073277.3U CN217741725U (en) | 2022-05-06 | 2022-05-06 | Miniaturized cable and radio frequency port measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217741725U true CN217741725U (en) | 2022-11-04 |
Family
ID=83818254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221073277.3U Active CN217741725U (en) | 2022-05-06 | 2022-05-06 | Miniaturized cable and radio frequency port measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217741725U (en) |
-
2022
- 2022-05-06 CN CN202221073277.3U patent/CN217741725U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101662078B (en) | Small shielding body electromagnetic shielding performance testing device, system and method therefor | |
| CN111044971A (en) | Two-dimensional interferometer direction finding system | |
| CN107576879B (en) | Frequency sweep measuring device and method for estimating cable attribute | |
| CN102752061B (en) | Device and method for generating reference signal of phase-locked amplifier of millimeter wave attenuation measurement system | |
| CN105738708B (en) | A kind of shortwave antenna tuning coupler insert loss device and method | |
| CN101105525A (en) | Pure phase type broad frequency band microwave radiation source direction finding system and method | |
| CN103269253A (en) | Passive intermodulation fault location detection circuit structure based on multiple order digital sweep frequency | |
| CN1963545A (en) | Apparatus and method for testing standing wave of multi-antenna radio-frequency signal | |
| CN103596637B (en) | The detection method of antenna failure and device | |
| CN105022020A (en) | RF electromagnetic field and radio immunity test system and method of electric energy meter | |
| CN103439686A (en) | Single-channel radio direction finding system | |
| CN106443122B (en) | High-precision measurement device and method for wide-band large dynamic signal | |
| CN104898027A (en) | Multifunctional communication signal measurement radio frequency front-end circuit | |
| CN105842561A (en) | Background signal eliminating method suitable for on-site electromagnetic interference detection | |
| CN105119664A (en) | Ultra-short wave radio terminal testing device | |
| CN217741725U (en) | Miniaturized cable and radio frequency port measuring device | |
| CN104993891A (en) | Multi-carrier signal time delay online calibration system | |
| CN110531298B (en) | Detection method and system for performance improvement of ultrahigh frequency partial discharge sensor | |
| CN204705691U (en) | A kind of radio-frequency (RF) front-end circuit of multifunctional communication signal measurement | |
| CN104914115A (en) | Soil moisture content tester and testing method thereof | |
| CN203193645U (en) | Passive intermodulation fault location detection circuit structure based on multi-order digital sweep frequency | |
| Betta et al. | Experimental investigation of the electromagnetic interference of ZigBee transmitters on measurement instruments | |
| CN107241151A (en) | A kind of specific region radio signal detection device and method | |
| CN102176688A (en) | Objective test system for evaluating receiving performance of mobile TV terminal in air | |
| CN103983937A (en) | Signal detection system applied to anechoic chamber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |