CN200993663Y - Microwave network analytic instrument - Google Patents
Microwave network analytic instrument Download PDFInfo
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- CN200993663Y CN200993663Y CN 200720006031 CN200720006031U CN200993663Y CN 200993663 Y CN200993663 Y CN 200993663Y CN 200720006031 CN200720006031 CN 200720006031 CN 200720006031 U CN200720006031 U CN 200720006031U CN 200993663 Y CN200993663 Y CN 200993663Y
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Abstract
A microwave network analyzer is provided, which relates to a device for measuring microwave, in particular to a microwave network analyzer that can realize automatic measurement of microwave in multiple parameters under the condition of dot frequency and frequency sweep at the manual and automatic status. The utility model is able to realize the measurement of dot frequency and frequency sweep at manual and automatic status, thus reaching multiple functions and high cost performance. Therefore, the utility model is especially fit for the microwave network analyzer in the microwave teaching and experiment. The utility model comprises a DC split amplifier, a step motor driving circuit, a sawtooth generator, a benchmark voltage circuit, two voltage grading circuits, an addition circuit, a stopping circuit, a filtering circuit, a sawtooth peak detection circuit, a data collecting card with USB interface, a power source circuit, a built-in microcomputer, a LCD, a CD-ROM, a manual/automatic option switch, a broadband/narrowband option switch, a No. 1 dot frequency/frequency sweep option switch, a No. 2 dot frequency/frequency sweep option switch, a voltage change-over switch, a pointer type ammeter and a digital voltmeter.
Description
Technical field
The utility model relates to a kind of device that is used for microwave measurement, especially relates to a kind ofly manually and under the auto state, is used to realize the microwave network analyzer of multiple parameter automatic microwave measuring under a frequency and the frequency sweep condition.
Background technology
Existing MMU microwave measurement unit mostly is some equipment that are applied to industrial circle, No 25 Inst. of No 2 Academy, Ministry of Space Industry for example, Ministry of Petroleum Industry and reservoir physical property test center of Scientific Research Institute of Petroleum Exploration and Development Planning provide a kind of core microwave measurement device for testing saturation of water contained in physical model that is used for oil development research in for 86100707 application for a patent for invention at application number, for solving the instantaneous distribution problem of core testing saturation of water contained in physical model, this invention adopts polynary single file dual-mode antenna array to form multichannel measurement, throws microwave switch by Data Acquisition and Conversion System (DACS) through hilted broadsword more and realizes that the timesharing of microwave signal transmits and receives; Simultaneously, drive by antenna control unit and mobile topworks, make the dual-mode antenna array on the direction perpendicular, do mechanical scanning, constitute the quick dynamo-electric scanning of the block core physical model of large tracts of land with it. flexible operation, easy, and have characteristics such as robotization, digitizing and computerization.This device is made up of microwave system, low frequency amplification system, scanning system and pen recorder etc., generally carries out with manual mode as for the microwave measurement that is applied to microwave education experiment test macro, and not only process is slow, and precision is difficult to improve.These MMU microwave measurement unit are typically provided with microwave source, isolator, variable attenuator, waveguide slotted line, precision attenuator and pyron detector.The microcomputer subsidiary of colleges and universities of domestic a few institute employing at present is the exploitation eighties in 20th century, and more its microwave source adopts Gunn diode and speed to survey and manage shortcomings such as the ubiquity swept frequency range is narrow, measurement range finite sum frequency stability difference.Simultaneously the amplification of rectified signal and interface board be designed to a frequency, a frequency sweep cover separately, plug interface board at any time during practical application changes the line of different instruments, adopts the DOS user interface on software design, and is visual in image inadequately, makes troubles to test.
The applicant provides a kind of microwave scalar network analyzer in the utility model patent of notification number for CN2578836, be provided with housing, direct current amplifier, stepper motor driving circuit, some frequency and frequency sweep control signal circuit and power circuit, and circuit connector; The input end of direct current amplifier is used for the probe rectified signal output terminal on the waveguide slotted line of respectively external microwave device, band step motor and the output terminal of pyron detector; The stepper motor of the external microwave device of output terminal of stepper motor driving circuit; Point frequently and the external microwave source of frequency sweep control signal circuit output end is used to microwave source that the swept-frequency signal of a frequency and different frequency bands is provided, with the signal frequency in controlled microwave source; Each circuit is laid on the circuit board, and circuit connector is located on circuit board and the housing.The shortcoming that said apparatus exists mainly is: 1, the equipment of required outfit is more, and the expense height is moved difficulty, and operation steps is loaded down with trivial details.2, the data collecting card of Pei Beiing can't be general under any microcomputer, is not easy to plug.3, direct current amplifier can't satisfy the requirement of directly reading standing wave ratio.4, digital ammeter and digital voltmeter lack data indication and the graphic presentation to sensed current, standing-wave ratio (SWR), impedance circle diagram, die-away curve etc.
Summary of the invention
The purpose of this utility model is intended at shortcomings such as the existing function singleness of above-mentioned microwave scalar network analyzer, use inconvenience, provide a kind of can be manually and under the auto state, realize some frequency and sweep measurement, a tractor serves several purposes, the cost performance height is particularly suitable for the microwave network analyzer of microwave education experiment.
The technical solution of the utility model is on the basis of above-mentioned microwave scalar network analyzer, changes digital ammeter into pointer reometer, can directly read standing wave ratio in conjunction with the stepping amplifying circuit of setting up; Increase the three-phase double-break switch on digital voltmeter, the voltage that has increased " standing wave ", " benchmark " and " sawtooth " is indicated, and has expanded sensing range; Increased by 4 two-phase double-pole mode switchs,, and added embedded microcomputer and band USB interface data collecting card etc. for proper operation brings convenience.
The utility model is provided with direct current and divides the retaining amplifier, stepper motor driving circuit, saw-toothed wave generator, reference voltage circuit, two bleeder circuits, adding circuit, block isolating circuit, filtering circuit, the sawtooth wave peak detection circuit, band USB interface data collecting card, power circuit, embedded microcomputer, LCD, CD-ROM drive and manual selector switch, broadband/arrowband selector switch, the 1st frequency/frequency sweep selector switch, the 2nd frequency/frequency sweep selector switch, voltage change-over switch, pointer-type reometer and digital voltmeter, rectified signal output terminal or pyron detector output terminal that direct current divides the retaining amp.in to connect the microwave measurement system waveguide slotted line, direct current divide the retaining amplifier out to connect the A/D input port of USB interface data collecting card and the standing wave end of voltage change-over switch; The DI/DO output port of stepper motor driving circuit input end tape splicing USB interface data collecting card, the stepper motor on the stepper motor driving circuit output termination waveguide slotted line, the probe base that is used to control on the driven by motor slotted line moves along waveguide slotted line; The frequency sweep end of the 1st frequency/frequency sweep selector switch of saw-toothed wave generator output termination and the manual end of automatic/hand selector switch, the 1st frequency/frequency sweep selector switch stiff end of the 1st bleeder circuit input termination, the 1st bleeder circuit output termination block isolating circuit input end and adding circuit input end, block isolating circuit output termination sawtooth wave peak detection circuit input end, the sawtooth wave end of sawtooth wave peak detection circuit output termination voltage change-over switch; Reference voltage circuit output termination the 2nd bleeder circuit input end, the point of the 2nd frequency/frequency sweep selector switch of the 2nd bleeder circuit output termination is the input end of end, adding circuit and filtering circuit frequently, the reference edge of filtering circuit output termination voltage change-over switch; The arrowband end of adding circuit output termination broadband/arrowband selector switch; The automatic end of the D/A mouth output termination automatic/hand selector switch of band USB interface data collecting card, the broadband end of the fixedly termination broadband/arrowband selector switch of automatic/hand selector switch, the frequency sweep end of the 2nd the frequency/frequency sweep selector switch of fixedly termination of broadband/arrowband selector switch, the input end in the fixedly termination VCO source of the 2nd frequency/frequency sweep selector switch, under the common control of manual selector switch, broadband/arrowband selector switch and the 2nd frequency/frequency sweep selector switch, be embodied as the sweep voltage that microwave VCO source provides a frequency voltage and different frequency bands; Power circuit provides each circuit suitable operating voltage; Pointer-type reometer, digital voltmeter and LCD are located on the panel of microwave network analyzer, the pointer-type reometer connects direct current and divides the retaining amplifier out, the pointer-type reometer is used for the demodulation current value after indication point frequency state amplifies down, pointer-type reometer gauge outfit marking standing-wave ratio (SWR) is with standing wave ratio under the display dot frequency state; Digital voltmeter connects the voltage change-over switch stiff end, digital voltmeter is established 3 grades, be respectively " standing wave ", " benchmark " and " sawtooth ", rectified signal magnitude of voltage after " standing wave " shelves demonstration direct current amplifier amplifies, the dc offset voltage value of " benchmark " shelves display dot during frequently with frequency sweep, " sawtooth " shelves show sawtooth voltage crest voltage; LCD is connected with embedded microcomputer, and point shows that standing wave distributes and impedance circle diagram on the slotted line frequently the time, shows tuning curve waveform etc. during frequency sweep.
The utility model combines with microwave measurement system and can realize the microwave multiparameter measurement, and wherein microwave measurement system can be provided with waveguide slotted line, detected element and the pyron detector of VCO voltage controlled oscillator, isolator, variable attenuator, absorption frequency meter, band stepper motor.Compare with original microwave network analyzer, outstanding advantage of the present utility model is:
1. during with manual measurement 6 instruments such as the microwave network analyzer of required outfit frequency-selecting amplifier, oscillograph, velocity modulation villous themeda power supply and required outfit when measuring automatically, microcomputer, display all detect and Presentation Function comprehensively in instrument of microwave network analyzer, under the control of four two-way double-break switchs, select duty easily, guaranteed correctly to detect fast step, and a tractor serves several purposes cost performance height, required cost is saved over half than original device.
2. adopt band USB interface data collecting card, support hot-swappablely, can under kinds of platform, use.
3. adopt the direct current stepping amplifier of 0～70db to substitute original frequency-selecting amplifier function, demodulation current value and standing wave ratio under the indication point frequency state.
4. employing modular design, 5 connecting grooves of upper case base plate insert direct current branch retaining amplifier plate, stepper motor driving circuit plate, some frequency and scanning control circuit plate, power supply circuit board, band USB interface data collecting card respectively in microwave network analyzer, the embedded microcomputer of lower case is for debugging, maintenance, detection and retrofit etc. bring convenience.
5. the panel of microwave network analyzer is installed pointer reometer, digital voltmeter and LCD, the pointer-type reometer connects direct current and divides the retaining amplifier out, demodulation current value after indication point frequency state amplifies down, this reometer gauge outfit with constantly standing wave ratio, with standing wave ratio under the display dot frequency state, wave amplitude transfers to full scale 1 during measurement, and the node indication is exactly a standing wave ratio; Digital voltmeter is established third gear, be respectively " standing wave ", " benchmark " and " sawtooth ", rectified signal magnitude of voltage after " standing wave " shelves demonstration direct current amplifier amplifies, " benchmark " shelves display dot dc offset voltage value during frequently with frequency sweep, " sawtooth " shelves show sawtooth voltage crest voltage.LCD is connected with embedded microcomputer, substitutes oscillograph, shows impedance circle diagram during the point frequency, shows tuning curve waveform etc. during frequency sweep.
6. consistent with the required profile panel material of modernized surveying instrument, the panel control function is rationally distributed.
In sum, the utility model matches with microwave measurement system can realize the measurement of microwave multiparameter, measures the Q value of cavity, centre frequency and bandwidth etc. under waveguide wavelength under the state frequently, frequency, standing-wave ratio (SWR), complex reflection coefficient, loaded impedance, the frequency sweep state easily.The utility model not only can manually but also can have been measured automatically, when automatically measuring based on microcomputer, microcomputer is by the program of predetermined establishment, the method of simulating manual slotted line is gathered, computing, measurement such as error analysis and processing, except realizing the measurement function under the manual state, auto state can also carry out the transmission coefficient of calibration, calibration and the load of common attenuator down and measure, the manual operations that dullness is uninteresting become by microcomputer gather automatically, computer processing data, and the standing wave of vivid real-time display dot frequently the time distributes and the frequency response curve during frequency sweep.Its function has satisfied the requirement of conventional microwave measurement, and the simple easy operating in interface, realize a tractor serves several purposes, increased the dirigibility of test and comprehensive, this device cost performance height in addition, manually be equipped with by education experiment, required for the scientific research measurement automatically, be particularly suitable for the upgrading of microwave teaching experimental equipment.
Description of drawings
Fig. 1 forms microwave multiparameter measuring device embodiment composition frame chart for the utility model combines with microwave measurement system.
Fig. 2 is the circuits of direct current amplifier schematic diagram of the utility model embodiment.In Fig. 2, R
1=20k, R
2=100k, R
3=R
4=6.8k, R
5=R
6=50k, R
7=30k, R
8=33k, R
9=R
10=100k, R
11=R
12=15k, R
13=30, R
14=100, R
15=330, R
16=1k, R
17=3.3k, R
18=10k, R
19=46k, R
20=6k, R
W1=50k, R
W2=20k; C
1=C
2=C
3=10000pF.Input end is In, and output terminal is respectively Out1 and Out2.
Fig. 3 is the stepper motor driving circuit schematic diagram of the utility model embodiment.In Fig. 3, R1～R4=1K, R5～R8=10K.
Fig. 4 is the schematic diagram of the saw-toothed wave generator of the utility model embodiment.In Fig. 4, R
1=R
2=10k, R
3=120k, R
4=50k, R
5=100, R
6=R
7=39k, R
8=6k, R
9=R
10=7.5k, R
11=2.2k, R
12=R
14=5k, R
13=1k, R
15=50k, R
16=3k, R
17=10k, R
18=5k, R
19=4.7k, R
20=33k; VR1=10k, VR2=50k, VR3=500; C
1=0.22pF, C
2=3300pF/25V, C
3=103pF.
Fig. 5 is adding circuit and the detection output circuit schematic diagram of the utility model embodiment.In Fig. 5, R
22=R
23=R
25=R
26=R
29=100k, R
21=R
24=R
27=R
28=20k, R
30=50k; C
4=1 μ F; L
1=10mH.
Fig. 6 is the stabilized voltage supply local circuit schematic diagram of the utility model embodiment.
Fig. 7 is the appearance assumption diagram of the microwave network analyzer of the utility model embodiment.
Embodiment
As shown in Figure 1, the utility model II combines with microwave measurement system I, form a microwave multiparameter measuring device, wherein microwave measurement system I is provided with waveguide slotted line 5, detected element 6 and the pyron detector 7 of VCO voltage controlled oscillator 1, isolator 2, variable attenuator 3, absorption frequency meter 4, band stepper motor.Adopting VCO voltage controlled oscillator 1 is microwave source, this source produces the microwave power of frequency adjustable, its microwave frequency is by system controlled by computer, control voltage is by the 2nd frequency/frequency sweep selector switch K4 stiff end input, both can obtain a certain fixed voltage, also can obtain the voltage, particularly sawtooth voltage of different amplitude arbitrary shapes, therefore the swept-frequency signal of a frequency and different frequency bands can be provided easily.Pointer-type electric current gauge outfit 21 can connect LCD 22 and printer 23.
Microwave network analyzer II is provided with direct current and divides retaining amplifying circuit 19, stepper motor driving circuit 18, saw-toothed wave generator 9, reference voltage circuit 11, two bleeder circuits 10 and 12, adding circuit 13, block isolating circuit 14, sawtooth wave peak detection circuit 15, filtering circuit 16, digital voltmeter 17, band USB interface data collecting card 8, power circuit 20, pointer reometer 21, embedded microcomputer 22, CD-ROM drive 23 and LCD 24.Direct current divides the rectified signal output terminal or pyron detector 7 output terminals of retaining amplifying circuit 19 input termination slotted lines 5, and direct current divides the A/D input port of retaining amplifying circuit 19 output termination USB interface data collecting cards 8 and the standing wave end of voltage change-over switch K5; The DI/DO output port of stepper motor driving circuit 18 input end tape splicing USB interface data collecting cards 8, stepper motor on the stepper motor driving circuit 18 output termination waveguide slotted lines 5, the probe base that is used to control on the driven by motor slotted line moves along waveguide slotted line; The 1st frequency of saw-tooth wave generating circuit 9 output terminations/frequency sweep selector switch K
1Frequency sweep end and automatic/hand selector switch K
2Manual end, the 1st frequency/frequency sweep selector switch K
1Stiff end be connected to adding circuit 13 and block isolating circuit 14 input ends respectively through the output of the 1st bleeder circuit 10, through every direct sending toward sawtooth wave peak detection circuit 15 input ends, sawtooth wave peak detection circuit 15 output termination voltage change-over switch K
5The sawtooth end; Reference voltage circuit 11 output terminations the 2nd bleeder circuit 12 input ends, the 2nd frequency of the 2nd bleeder circuit 12 output terminations/frequency sweep selector switch K
4Point hold frequently, the input end of adding circuit 13 and filtering circuit 16, the reference edge of filtering circuit 16 output termination voltage change-over switch K5; Adding circuit 13 output termination broadband/arrowband selector switch K
3The arrowband end; The D/A mouth output termination automatic/hand selector switch K of band USB interface data collecting card 8
2Automatic end, the fixedly termination broadband of automatic/hand selector switch K2/arrowband selector switch K
3The broadband end, the 2nd frequency of the fixedly termination of broadband/arrowband selector switch K3/frequency sweep selector switch K
4The frequency sweep end, the Vc input end in the fixedly termination VCO source 1 of the 2nd frequency/frequency sweep selector switch K4 is at automatic/hand selector switch K
2, broadband/arrowband selector switch K
3With the 2nd frequency/frequency sweep selector switch K
4Common control under, being embodied as microwave VCO source 1 provides some the sweep voltage of voltage and different frequency bands frequently; Power circuit 20 generation-12V ,+12V ,+5V and ± 15V four tunnel stabilized voltage supplys, wherein-12V provides VCO VCO microwave source 1 required voltage, + 12V provides motor-drive circuit 18 required voltage, + 5V provides operating voltage for digital voltmeter 17, and ± 15V provides required voltage for amplifying circuit 19 in the stepping amplifying circuit.The USB end of the data collecting card 8 of band USB interface is held with the USB of embedded microcomputer 22 and is connected, and embedded microcomputer 22 connects LCD 24 and CD-ROM drive 23, in the embedded microcomputer 22 more than the processor selection PIII.Panel of the present utility model (referring to Fig. 7) is installed pointer reometer 21, digital voltmeter 17 and LCD 24.Pointer-type reometer 21 connects direct current and divides the retaining amplifying circuit 19 output terminals, demodulation current value after indication point frequency state amplifies down, this reometer gauge outfit marking standing-wave ratio (SWR) is with standing wave ratio under the display dot frequency state, wave amplitude transfers to full scale 1 during measurement, but refers to just direct-reading standing wave ratio from the node place.Digital voltmeter 17 is established 3 grades, be respectively " standing wave ", " benchmark " and " sawtooth ", " standing wave " shelves show the rectified signal magnitude of voltage after dc amplification circuit 19 amplifies, the dc offset voltage value of " benchmark " shelves display dot during frequently with frequency sweep, " sawtooth " shelves show sawtooth voltage crest voltage.LCD 24 is connected with embedded microcomputer 22, shows that standing wave distributes and impedance circle diagram on the slotted line during point frequency, shows tuning curve waveform etc. during frequency sweep.
Fig. 2 provides the schematic diagram of A/D dc amplification circuit, and in microwave measurement system, the crystal detection signal is generally 100～5mV, so rectified signal must carry out the A/D conversion by the input interface plate after direct current amplifies.This dc amplification circuit is made up of 3 grades of operational amplifiers, can realize that the stepping from 0dB to 70dB amplifies, and integrated transporting discharging adopts the OP07 type pipe of high-precision low-drift, and resistance adopts metalfilmresistor, and potentiometer is selected accurate multiturn potentiometer for use.In order to realize that the stepping from 0dB to 70dB amplifies, and the output of the voltage when high-amplification-factor keeps stable, and this circuit has adopted a series of unique design schemes.
At first be 3 grades of amplifying circuits.The first order is the in-phase proportion amplifier, is the Voltage Series negative feedback, makes circuit have the high advantage of input impedance, and its circuit gain is A
V1=1+R
2/ R
xThe special feature of this design is that end of oppisite phase passes through 7 groups of resistance and links to each other with the ground end with the circuit of switch series connection.When whole switches all disconnected, anti-phase input resistance was equivalent to infinity, then A
V1=1, the decibels of amplification is 0dB.When switch successively when first grade pushes the 7th grade, because R
2And special relation between the anti-phase input resistance resistance can realize the amplification from 10dB to 70dB.In order to realize the balance of positive input and anti-phase input resistance, getting the positive input resistance is 20k.The second level is anti-phase ratio amplifying circuit, A
V2=-(R
4+ R
W2)/R
3Partial enlargement factor can be regulated by slide rheostat, when potentiometer by 0) when being screwed into 20k, then can on the basis of the decibel that the first order is amplified, increase by 0 to 10dB again.She Ji benefit is in the time of can preventing that gain increased one grade, because the completely inclined to one side reometer that damages of the pointer of electric current super-high-current table like this.Because detection tube is anti-phase output in the detection crystal frame, the probe rectified signal but is the positive rectified signal on the slotted line, has therefore increased third level unit's phase inverter.During work, adopt homophase to amplify or anti-phase amplification, should be according to the rectified signal polarity switch on the Selection Floater correctly.In actual applications, because the restriction of integrated transporting discharging pipe manufacturer technology, the differential pair tube in the circuit etc. can not be made symmetrically fully, has so just produced input offset voltage and offset current.When rectified signal was input as zero, output voltage was non-vanishing, therefore, has added outer zeroing circuit at second level in-phase end.The equivalent resistance of its outer zeroing circuit part is [(R
9//R
11)+Rw
1'] // [(R
10//R
12)+Rw
1"]+R
7In order to make partial positive and anti-phase input balance, insert R in positive terminal
25Make just anti-phase input resistance resistance equal substantially.Because gain is when different shelves, its input offset voltage is different with electric current, so this circuit inserts a potentiometer especially between 1,5,8 pin of the OP07 that the first order is amplified, and input offset current is transferred to minimum.Consider the fluctuation of power supply ± 15V simultaneously, will directly influence bucking voltage, make static zeroing unstable,, greatly reduced the influence of mains fluctuations and interference so adopt zero potentiometer neutral earthing mode.For output voltage is controlled in the 10V, insert the stabilivolt of positive and negative relative 9.1V at reversed-phase output, then be positive or reversed phase output voltage all embedding in 10V.
This A/D dc amplification circuit has not only been realized the function that stepping amplifies by these unique design, and it is stable to have when high-gain output, actual output and the little advantage of calculated value error.
Fig. 3 provides the stepper motor driving circuit schematic diagram, stepper motor is by system controlled by computer, microcomputer with drive signal by the data latches of interface card output (utilizing data acquisition card digital amount output function), by the photoelectricity coupling through power amplification (referring to each winding of back adding motor M of compound transistor Q1～Q4).Consider that required drive current is bigger, increase current-limiting resistance, and adopt powerful Darlington transistor D1861, increased reverse earial drainage switching tube IN4148 simultaneously.
Fig. 4 provides the sweep-generation circuit schematic diagram, as can be seen from Figure 4, and as amplifier U
1A1 end when being output as high level, diode D
1Conducting, so, by triode Q
1Begin capacitor C
1Charge.This moment, 2 terminal voltages raise gradually, and when 2 terminal voltages surpassed 3 ends, this moment, 1 end was output as low level.Diode D
1End D
2The beginning conducting.So, capacitor C
1Pass through D
2, resistance R
5Discharge.Circulation is so always gone down, and has just produced sawtooth wave.Wherein, U
1BBe follower.
Amplifier U
2AThe circuit at place is that a burning voltage produces circuit, and it can produce the burning voltage of 10V.Because this measuring system needs sawtooth wave to begin to produce from 0V, and U
1AThe sawtooth wave lower end that produces not is on 0V, therefore, passes through U
2AThe voltage and the U of the output of 1 end
1BThe sawtooth wave of output is at U
1CAfter the stack, the waveform of sawtooth wave is raised, and then passed through U
1DAmplifying circuit, finally formed the sawtooth wave that can between 0～10V, regulate.In Fig. 4, D
3Be voltage stabilizing diode.
Fig. 5 provides adding circuit and peak value is gathered output circuit.Because in the microwave arrowband is measured, need the starting point of sawtooth wave adjustable and amplitude is adjustable, therefore an adding circuit circuit must be arranged.DC voltage and the sawtooth wave regulated are superposeed, from the figure as can be seen, U
2AThe DC voltage of the 10V that produces can regulate DC voltage after passing through a potentiometer between 0～10V, pass through a follower U after the DC voltage after the adjusting
2BBe divided into two-way output, the one tunnel through inductance L
1Filtering exchanges and is connected to the digital voltmeter demonstration, and R is passed through on another road
22Enter in the adding circuit circuit, with R
23Sawtooth wave is superimposed after the adjusting that enters, from amplifier U
2C8 ends output narrow-band frequency-sweeping voltage.Another road of sawtooth wave after the adjusting enters peak value Acquisition Circuit U
2D, be connected to digital voltmeter and show.
Fig. 6 provides the local circuit schematic diagram of stabilized voltage supply, has nothing in common with each other according to the needed DC voltage of each several part functional block in the device, simultaneously also in order to prevent the phase mutual interference, designed ± 15V, ± 12V ,+5V No. five power circuits.In Fig. 6, at first,, obtain required separately DC voltage through transformation, rectification, filtering and voltage stabilizing with input transformer after the electric main process wave filter of 220V.Measuring system software of the present utility model adopts software through pictures to write, and realizes waveguide wavelength under the some frequency state, frequency, standing-wave ratio (SWR), reflection coefficient, the transport property of device under loaded impedance and the frequency sweep state, the Q value of cavity, the measurement of parameters such as frequency deviation Δ f.Automatic measuring process branch frequency and frequency sweep two states.Under state frequently double gear switch place respectively homophase, automatically, point frequently, (arrowband, broadband any), measurable project comprises that short circuit correction, standing wave measurement, crystal detection rule are proofreaied and correct and moving standing wave (loaded impedance) is measured.Double gear switch of the present utility model places anti-phase, automatic, frequency sweep, broadband respectively under the frequency sweep state, and measurable project comprises that the Q value is measured under this state, attenuator calibration and transmission coefficient measure.
Appearance assumption diagram of the present utility model in Fig. 7, is provided with digital voltmeter 17, pointer electric current gauge outfit 21 and LCDs 24 referring to Fig. 7 on panel, the range of adjustment of amplifier is 0～70db.
Claims (1)
1. microwave network analyzer, it is characterized in that being provided with direct current and divide the retaining amplifier, stepper motor driving circuit, saw-toothed wave generator, reference voltage circuit, two bleeder circuits, adding circuit, block isolating circuit, filtering circuit, the sawtooth wave peak detection circuit, band USB interface data collecting card, power circuit, embedded microcomputer, LCD, CD-ROM drive and manual selector switch, broadband/arrowband selector switch, the 1st frequency/frequency sweep selector switch, the 2nd frequency/frequency sweep selector switch, voltage change-over switch, pointer-type reometer and digital voltmeter, rectified signal output terminal or pyron detector output terminal that direct current divides the retaining amp.in to connect the microwave measurement system waveguide slotted line, direct current divide the retaining amplifier out to connect the A/D input port of USB interface data collecting card and the standing wave end of voltage change-over switch; The DI/DO output port of stepper motor driving circuit input end tape splicing USB interface data collecting card, the stepper motor on the stepper motor driving circuit output termination waveguide slotted line, the probe base that is used to control on the driven by motor slotted line moves along waveguide slotted line; The frequency sweep end of the 1st frequency/frequency sweep selector switch of saw-toothed wave generator output termination and the manual end of automatic/hand selector switch, the 1st frequency/frequency sweep selector switch stiff end of the 1st bleeder circuit input termination, the 1st bleeder circuit output termination block isolating circuit input end and adding circuit input end, block isolating circuit output termination sawtooth wave peak detection circuit input end, the sawtooth wave end of sawtooth wave peak detection circuit output termination voltage change-over switch; Reference voltage circuit output termination the 2nd bleeder circuit input end, the point of the 2nd frequency/frequency sweep selector switch of the 2nd bleeder circuit output termination is the input end of end, adding circuit and filtering circuit frequently, the reference edge of filtering circuit output termination voltage change-over switch; The arrowband end of adding circuit output termination broadband/arrowband selector switch; The automatic end of the D/A mouth output termination automatic/hand selector switch of band USB interface data collecting card, the broadband end of the fixedly termination broadband/arrowband selector switch of automatic/hand selector switch, the frequency sweep end of the 2nd the frequency/frequency sweep selector switch of fixedly termination of broadband/arrowband selector switch, the input end in the fixedly termination VCO source of the 2nd frequency/frequency sweep selector switch; Pointer-type reometer, digital voltmeter and LCD are located on the panel of microwave network analyzer, and pointer reometer connects direct current and divides the retaining amplifier out; Digital voltmeter connects the voltage change-over switch stiff end, digital voltmeter is established 3 grades, be respectively " standing wave ", " benchmark " and " sawtooth ", rectified signal magnitude of voltage after " standing wave " shelves demonstration direct current amplifier amplifies, the dc offset voltage value of " benchmark " shelves display dot during frequently with frequency sweep, " sawtooth " shelves show sawtooth voltage crest voltage; LCD is connected with embedded microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720006031 CN200993663Y (en) | 2007-01-09 | 2007-01-09 | Microwave network analytic instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720006031 CN200993663Y (en) | 2007-01-09 | 2007-01-09 | Microwave network analytic instrument |
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| Publication Number | Publication Date |
|---|---|
| CN200993663Y true CN200993663Y (en) | 2007-12-19 |
Family
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|---|---|---|---|
| CN 200720006031 Expired - Fee Related CN200993663Y (en) | 2007-01-09 | 2007-01-09 | Microwave network analytic instrument |
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| CN101503850B (en) * | 2008-05-03 | 2013-04-17 | 何伟斌 | Control system of sock head sewing machine and sock head sewing machine equipped therewith |
| CN101503849B (en) * | 2008-05-03 | 2013-04-17 | 何伟斌 | Control system of sock head sewing machine and sock head sewing machine equipped therewith |
| CN101469495B (en) * | 2008-05-04 | 2013-05-15 | 何伟斌 | Control system of sock head sewing machine and sock head sewing machine equipped therewith |
| CN104243022A (en) * | 2014-08-28 | 2014-12-24 | 北京邮电大学 | Light vector network analyzer and using method thereof |
| CN109285295A (en) * | 2018-09-10 | 2019-01-29 | 河南元祖信息技术有限公司 | Real estate payment and certificate issuing integrated equipment intelligent terminal system |
-
2007
- 2007-01-09 CN CN 200720006031 patent/CN200993663Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503850B (en) * | 2008-05-03 | 2013-04-17 | 何伟斌 | Control system of sock head sewing machine and sock head sewing machine equipped therewith |
| CN101503849B (en) * | 2008-05-03 | 2013-04-17 | 何伟斌 | Control system of sock head sewing machine and sock head sewing machine equipped therewith |
| CN101469494B (en) * | 2008-05-04 | 2013-04-17 | 何伟斌 | Control system of sock head sewing machine and sock head sewing machine equipped therewith |
| CN101469495B (en) * | 2008-05-04 | 2013-05-15 | 何伟斌 | Control system of sock head sewing machine and sock head sewing machine equipped therewith |
| CN104243022A (en) * | 2014-08-28 | 2014-12-24 | 北京邮电大学 | Light vector network analyzer and using method thereof |
| CN104243022B (en) * | 2014-08-28 | 2016-08-31 | 北京邮电大学 | Light vector Network Analyzer and using method thereof |
| CN109285295A (en) * | 2018-09-10 | 2019-01-29 | 河南元祖信息技术有限公司 | Real estate payment and certificate issuing integrated equipment intelligent terminal system |
| CN109285295B (en) * | 2018-09-10 | 2019-12-06 | 河南元祖信息技术有限公司 | Real estate payment and certificate issuing integrated equipment intelligent terminal system |
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