CN102419399A - System for measuring directional diagram of Wi-Fi (Wireless Fidelity) waveband antenna - Google Patents
System for measuring directional diagram of Wi-Fi (Wireless Fidelity) waveband antenna Download PDFInfo
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- CN102419399A CN102419399A CN2011102625526A CN201110262552A CN102419399A CN 102419399 A CN102419399 A CN 102419399A CN 2011102625526 A CN2011102625526 A CN 2011102625526A CN 201110262552 A CN201110262552 A CN 201110262552A CN 102419399 A CN102419399 A CN 102419399A
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Abstract
The invention discloses a system for measuring a directional diagram of a Wi-Fi (Wireless Fidelity) waveband antenna. The system comprises a microprocessor, a transmitter, a receiver and an antenna location controlling device, wherein the transmitter comprises a signal source, a horizontal/vertical selector switch and a first antenna, all of which are connected in sequence; the microprocessor is respectively connected with the signal source and the horizontal/vertical selector switch; the receiver comprises a second antenna, a wave detector and an amplifier, all of which are connected sequentially, wherein the second antenna is fastened on the antenna location controlling device; and the microprocessor is respectively connected with the antenna location controlling device and the amplifier. The system for measuring the directional diagram of the Wi-Fi waveband antenna, provided by the invention, is low in price.
Description
Technical field
The present invention relates to antenna and microwave radio circuit field, particularly a kind of Wi-Fi wave band antenna pattern measurement system.
Background technology
In recent years; Be accompanied by people to the increasing dependence of wireless network and to the endless pursuit of express network; How designing a high performance antenna that is operated in the Wi-Fi wave band has become the research focus of engineering circle, and increasing micro radio device fabrication producer puts in these research ranks.Though some manufacturers utilize ripe simulation software to possess certain research and development strength,, therefore limited its development to a certain extent because it is too high to set up a whole set of antenna radiation pattern measuring system cost.
Summary of the invention
Goal of the invention: the problem and shortage to above-mentioned existing existence the purpose of this invention is to provide a kind of cheap Wi-Fi wave band antenna pattern measurement system.
Technical scheme: be to realize the foregoing invention purpose, the technical scheme that the present invention adopts is an a kind of Wi-Fi wave band antenna pattern measurement system, comprises microprocessor, transmitter, receiver and antenna-positioning device; Wherein:
Said transmitter comprises signal source, horizontal/vertical SS and first antenna that connects successively, and said microprocessor connects said signal source and horizontal/vertical SS respectively;
Said receiver comprises second antenna, wave detector and the amplifier that connects successively, and wherein second antenna is fixed on the said antenna-positioning device, and said microprocessor connects antenna-positioning device and amplifier respectively.
Said antenna-positioning device can comprise first stepper motor and second stepper motor, and said first stepper motor is fixed on second stepper motor, and second antenna is fixed on said first stepper motor; 360 ° the rotation on surface level of second stepper motor, first stepper motor is 180 ° of rotations from top to bottom, are aided with computer programming control (as shown in Figure 3); Revolution is crossed an angle; Receiving cable is opened, is deposited in data, treat that all data tests finish after; Handle through simple mathematical, obtain the directional diagram and the gain of antenna.
Said first antenna can be Antonio Vivaldi (Vivaldi) antenna (with reference to 201110054862.9).Said second antenna can be standard horn antenna.
Also can comprise FPGA (Field-Programmable Gate Array, the field programmable gate array) chip that connects said signal source.This fpga chip can produce the control word of the required usefulness of signal source, thus control this signal source produce frequency range between 2050MHz～2450MHz, amplitude-13～-3dBm between continuously adjustable radiofrequency signal; Wherein when frequency during at 2.4GHz, the phase noise at 1MHz place is lower than-100dBc/Hz, utilizes the Vivaldi antenna (as shown in Figure 2) based on the novel artificial electromagnetic material with high directionality to launch this signal; Digital control part is utilized two rotating stepper motors, is aided with computer programming control (as shown in Figure 3), and revolution is crossed an angle; Receiving cable is opened, is deposited in data, treat that all data tests finish after; Handle through simple mathematical, obtain the directional diagram and the gain of antenna.
Said wave detector can be diode, and said amplifier can be direct current amplifier.Also can comprise the microwave amplifier that connects said second antenna and diode respectively.Said diode can be schottky diode.Said microprocessor can be provided with analog-to-digital conversion module, and the thief hatch of this analog-to-digital conversion module connects amplifier.The present invention has adopted the form of direct detection for the simplified receiver structure, utilizes the high sensitivity of schottky diode, and the radiofrequency signal direct detection is become direct current signal.In order to make receiver have maximum dynamic range, Aided Design microwave amplifier and the dc amplification circuit of back level of prime, through the control enlargement factor, make the signal after the final processing can cover AD (modulus) sample range to the full extent.Be the basis with Visual Basic, through the establishment project file, the control serial ports sends instruction, and then operation of control step motor and analog-to-digital conversion module (ADC, Analog-to-Digital Converter).
Said microprocessor also can connect display module, is used to show the antenna radiation pattern of output.
Beneficial effect: 1, measuring accuracy of the present invention is higher.Compare with the commercial antenna measurement system of present maturation, to the average error of each point measurement on the gain of same antenna and the directional diagram less than 1dB, the credible result of measurement.2, the present invention is easy to operate.Ripe at present commercial antenna measurement system is very complicated.Simultaneously, suspect that a some sniffing is wherein arranged, need all points be remeasured if surveyed the back.The invention provides manual measurement and measure two kinds of mode of operations automatically,, directly import the coordinate of this point, antenna is run to this point just can remeasure easily if find that wherein certain point has problem.Moreover, owing in the digital Design part, increased the function that each stepping angle is set, stepper motor can scan the total space with different speed.Main lobe at antenna especially can carefully be swept at the main lobe edge, and under the not high situation of the secondary lobe of antenna or accuracy requirement, can increase the stepping angle of scanning, shortens the test duration.3, the present invention is cheap.At present ripe Antenna testing system price is all at hundreds of thousands yuan, but because the present invention has fixed on the Wi-Fi wave band with the frequency range of antenna measurement, in design, made very big simplification for the present invention of this frequency range.Therefore, if produce this system later in batches, price can be fit to micro radio equipment vendors and use well below the commercial test platform of present maturation very much.4, the present invention is in light weight, is easy to processing.The main body of total system is made up of three pcb boards; Therefore can be integrated in the etui; Compare with signal source, receiver, the digital control part of complicacy in the traditional commercial Antenna testing system, weight is light, also simplifies greatly on the difficulty of processing.
Description of drawings
Fig. 1 is an entire block diagram of the present invention;
Fig. 2 is the synoptic diagram of Vivaldi antenna;
Fig. 3 is the software control interface of using among the present invention;
Fig. 4 is the measured drawing of receiver performance;
Fig. 5 utilizes standard horn antenna that the present invention and at present commercial antenna radiation pattern measuring system record respectively at the far-field pattern of frequency during for 2.4GHz.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Wi-Fi wave band antenna pattern measurement of the present invention system; Adopt the method for far field test; Utilization based on the Vivaldi antenna of novel artificial electromagnetic material as emission; In the form of receiver section employing diode direct detection, the main body frame of system (antenna to be measured among the figure is a standard horn antenna, is " second antenna " of claims and instructions summary of the invention part) as shown in Figure 1.
During system works, at first send a mode select signal and give horizontal vertical switch, select the polarization mode of emitting antenna with this by microprocessor.After selection finishes; Microprocessor can produce the serial code of 3bit and give the fpga chip (not shown); Be used to produce the control word of control signal source emissive power and frequency, FPGA is transferred to signal source with the control word of emissive power and frequency, and signal source produces the radiofrequency signal of 2.4GHz.Measure and calculate correction through frequency spectrograph and obtain this signal source when transmission frequency is 2.4GHz, the phase noise at 1MHz place is-112dBc/Hz.
After the chip ADF4360-1 from collection DDS (Direct Digital Synthesizer (Direct Digital Synthesizer)) and PLL (Phase Locked Loop, phaselocked loop) one produced needed radiofrequency signal, the Vivaldi antenna was with this signal emission.Utilization is based on the high directionality (gain: 15dB, beam angle: 25 spend) of the Vivaldi antenna of novel artificial electromagnetic material, and receiver accurately detects the signal of being launched more easily.
Because what wave detector detected is magnitude of voltage, in order to let detected magnitude of voltage reflect that exactly the size of measured power, detection tube must operate at linear one section of voltage and power.Therefore, do the test before need accurate Calculation and control emitting antenna and receiving antenna between distance.
At receiving end, utilize two easy stepper motor interleaved operations, measure the directional diagram and the gain of antenna in the total space.Electric Machine Control program by Visual Basic writes is moved in microprocessor, is divided into manually and automatic mode.Under automatic mode; Can test one by one with certain stepping angle three dimensions, and manual mode is that the automatic mode measurement result is well revised, if through data processing; The result who finds base point obviously departs from whole tendency, can import the coordinate of this point and resurvey.
The motor revolution is crossed an angle, and the ADC in the microprocessor opens, and carries out data acquisition.The design of receiver section is to be core with direct current detector diode HSMS2860, is aided with modules such as microwave amplifier (not shown), direct current amplifier, and radiofrequency signal is transformed into direct current.Because radiofrequency signal power is less, diode operation is in small-signal model, so detection is to carry out with the form of square-law, and the magnitude of voltage that detects is proportional to RF input power.Fig. 4 has shown the performance of whole receiver; Because the centered level of AD sampling is the cause of 2.5V; The result of actual samples should deduct centered level and calculate, and the dynamic range of whole receiver approximately is 25dB, and this is enough for general antenna measurement.
Consider the dynamic range of ADC sampling, between ADC and direct current detector diode, added the one-level direct current amplifier; Take all factors into consideration single power supply, rail-to-rail input and output and maximum sample range, adopt the chip MAX4123 of Maxim company to realize this function.
In system, take all factors into consideration the problem of test duration and measurement precision, the number of test points that is adopted is 24 * 12 * 2, and (surface level is interval with 15 degree, measures a circle 360 and spends totally 24 points; The pitching planar survey is 180 degree totally 12 points from top to bottom; The situation of consideration level and vertical polarization dual mode).In order to make the pattern smoothing that finally obtains, except recording a little, the value of all the other points adopts interpolation method to obtain.The data back microprocessor that records is the most at last handled through Matlab, and directional diagram draws.
Transmitter, receiver module above utilizing are tested the directional diagram of standard horn antenna, and the result is as shown in Figure 5.The antenna radiation pattern measuring system of same antenna being put into present commercialization compares measurement, and the result differs 0.7dB, can find out, whole design is compellent.
Claims (10)
1. a Wi-Fi wave band antenna pattern measurement system is characterized in that: comprise microprocessor, transmitter, receiver and antenna-positioning device; Wherein:
Said transmitter comprises signal source, horizontal/vertical SS and first antenna that connects successively, and said microprocessor connects said signal source and horizontal/vertical SS respectively;
Said receiver comprises second antenna, wave detector and the amplifier that connects successively, and wherein second antenna is fixed on the said antenna-positioning device, and said microprocessor connects antenna-positioning device and amplifier respectively.
2. according to the said Wi-Fi wave band antenna of claim 1 pattern measurement system; It is characterized in that: said antenna-positioning device comprises first stepper motor and second stepper motor; Said first stepper motor is fixed on second stepper motor, and second antenna is fixed on said first stepper motor.
3. according to the said Wi-Fi wave band antenna of claim 1 pattern measurement system, it is characterized in that: said first antenna is the Antonio Vivaldi antenna.
4. according to the said Wi-Fi wave band antenna of claim 1 pattern measurement system, it is characterized in that: also comprise the fpga chip that connects said signal source.
5. according to the said Wi-Fi wave band antenna of claim 1 pattern measurement system, it is characterized in that: said wave detector is a diode, and said amplifier is a direct current amplifier.
6. according to the said Wi-Fi wave band antenna of claim 5 pattern measurement system, it is characterized in that: also comprise the microwave amplifier that connects said second antenna and diode respectively.
7. according to claim 5 or 6 said Wi-Fi wave band antenna pattern measurement systems, it is characterized in that: said diode is a schottky diode.
8. according to the said Wi-Fi wave band antenna of claim 1 pattern measurement system, it is characterized in that: said microprocessor is provided with analog-to-digital conversion module, and the thief hatch of this analog-to-digital conversion module connects amplifier.
9. according to the said Wi-Fi wave band antenna of claim 1 pattern measurement system, it is characterized in that: said second antenna is a standard horn antenna.
10. according to the said Wi-Fi wave band antenna of claim 1 pattern measurement system, it is characterized in that: said microprocessor also connects display module.
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| CN2011102625526A CN102419399A (en) | 2011-09-06 | 2011-09-06 | System for measuring directional diagram of Wi-Fi (Wireless Fidelity) waveband antenna |
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| CN2011102625526A CN102419399A (en) | 2011-09-06 | 2011-09-06 | System for measuring directional diagram of Wi-Fi (Wireless Fidelity) waveband antenna |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104515909A (en) * | 2015-01-20 | 2015-04-15 | 中国人民解放军国防科学技术大学 | Large antenna directional pattern measuring method based on correlation method |
| CN108254630A (en) * | 2018-02-07 | 2018-07-06 | 西安星网天线技术有限公司 | A kind of short-wave antenna directional diagram and the measuring system and method for gain |
| CN110794222A (en) * | 2019-10-23 | 2020-02-14 | 上海霍莱沃电子系统技术股份有限公司 | Antenna test system and control method thereof |
| CN113533867A (en) * | 2021-07-14 | 2021-10-22 | 西安电子科技大学 | Fourier interpolation-based far field pattern rapid measurement method |
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| JP2003322668A (en) * | 2002-02-27 | 2003-11-14 | Matsushita Electric Ind Co Ltd | Polarized wave measuring device, antenna characteristic measuring device using the same and electric wave measuring device |
| CN102157797A (en) * | 2011-03-08 | 2011-08-17 | 东南大学 | Broadband high-gain flat-plate Vivaldi antenna |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515909A (en) * | 2015-01-20 | 2015-04-15 | 中国人民解放军国防科学技术大学 | Large antenna directional pattern measuring method based on correlation method |
| CN108254630A (en) * | 2018-02-07 | 2018-07-06 | 西安星网天线技术有限公司 | A kind of short-wave antenna directional diagram and the measuring system and method for gain |
| CN108254630B (en) * | 2018-02-07 | 2023-09-12 | 西安星网天线技术有限公司 | System and method for measuring directional diagram and gain of short wave antenna |
| CN110794222A (en) * | 2019-10-23 | 2020-02-14 | 上海霍莱沃电子系统技术股份有限公司 | Antenna test system and control method thereof |
| CN113533867A (en) * | 2021-07-14 | 2021-10-22 | 西安电子科技大学 | Fourier interpolation-based far field pattern rapid measurement method |
| CN113533867B (en) * | 2021-07-14 | 2022-09-06 | 西安电子科技大学 | Fourier interpolation-based far field pattern rapid measurement method |
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Application publication date: 20120418 |