CN1996043A - Resistance power-differential type signal antenna radar front end - Google Patents
Resistance power-differential type signal antenna radar front end Download PDFInfo
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- CN1996043A CN1996043A CN 200610023116 CN200610023116A CN1996043A CN 1996043 A CN1996043 A CN 1996043A CN 200610023116 CN200610023116 CN 200610023116 CN 200610023116 A CN200610023116 A CN 200610023116A CN 1996043 A CN1996043 A CN 1996043A
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Abstract
The resistance sub power single antenna radar front comprises the emitting antenna, receiving antenna and circuit, with the circuit being the receiving component connected with middle frequency signal handling system, composed of voltage-controlled oscillator, circulator, resistance, drive amplifier, and frequency mixer, the voltage controlled oscillator sending out signals, a small portion of which being distributed by the resistance, amplified by drive amplifier, sending to the frequency mixer through local oscillator signal, with most of the signal being emitting signal through the circulator to the emission antenna, echo-signal entered into frequency mixer and mixed with local oscillator signal, generating middle frequency singal, which is being amplified and filtered and delivered to middle frequency handling system. It cans flexibly adjusting the emission power and volume of the local oscillator power, acquiring the best performance, with good stability, suitable for radars of all kinds of vehicles.
Description
Technical field
The present invention relates to a kind of signals collecting part of car radar, specifically a kind of resistance power-differential type signal antenna radar front end, this radar front end is suitable for the application of various car radars.The present invention meets the system design technology in microwave radar field.
Background technology:
Radar is by the transmitter launching electromagnetic wave, and electromagnetic wave is received machine reception and processing after running into the object reflection, extracts the distance and the velocity information of object.Radar militarily with civilian on very big value is all arranged, it is the main application of radar aspect automobile that automobile collision avoidance radar and wagon flow detect a radar.
Recent years, the Automobile Millimeter Wave Radar technology developed rapidly, required the millimeter wave transceiving assembly to have characteristics such as volume is little, cost is low, good stability.Traditional millimeter wave transceiving assembly adopts waveguiding structure, but waveguiding structure assembly less stable, volume are bigger, are very limited on using.In addition, cost is the problem that must consider that transmitting-receiving subassembly faces.
Summary of the invention:
Technical matters to be solved by this invention provides a kind of good stability, is suitable for the resistance power-differential type signal antenna radar front end of various car radars, to overcome the poor stability that prior art exists, and defective such as applicability is little.
Another problem to be solved by this invention is to improve the defective that poor stability, volume that existing radar front end transmitting-receiving subassembly exists are big, can not adapt to production in enormous quantities, provides that a kind of transmitting-receiving subassembly volume is little, yield rate is high, good stability, the low resistance power-differential type signal antenna radar front end that is applicable to production in enormous quantities of cost.
The technical scheme of technical solution problem of the present invention is as follows:
A kind of resistance power-differential type signal antenna radar front end, comprise emitting antenna, receiving antenna and circuit part, described circuit part is a transmitting-receiving subassembly, it links to each other with the intermediate-freuqncy signal disposal system, it is characterized in that transmitting-receiving subassembly comprises voltage controlled oscillator, circulator, resistance, driving amplifier and frequency mixer; Wherein voltage controlled oscillator, circulator and emitting antenna are as transmitting branch; Receiving antenna, circulator and frequency mixer are as receiving branch; Resistance and driving amplifier are as the local oscillator branch road;
By transmitting of voltage controlled oscillator output, the sub-fraction signal distributes through resistance, amplifies through driving amplifier again, and as the local oscillation signal input mixer, most of signal is as transmitting by the circulator emitting antenna of feeding; The echoed signal that receiving antenna receives is carried out mixing through the circulator input mixer with local oscillation signal, produces intermediate-freuqncy signal, and intermediate-freuqncy signal through amplifying and filtering, is transferred to the intermediate-freuqncy signal disposal system again.
As a further improvement on the present invention, described circulator is the ferrite circulator of microstrip structure.Described voltage controlled oscillator adopts waveguiding structure, and driving amplifier adopts the GaAs mmic chip.Described frequency mixer adopts and mixes integrated single balance diode annular frequency mixer, and it adopts the diode back-off to be produced on the compound substance that specific inductive capacity is 2.2 RO5880.
By above disclosed technical scheme as can be known, the beneficial effect of resistance power-differential type signal antenna radar front end of the present invention is: radar front end proposed by the invention, and adopt resistance to divide the power-type structure, make very flexible, by replacing the branch power resistor of different resistances, can adjust the size of emissive power.Emission receives path by the shared dual-mode antenna of circulator, has reduced radar volume; Adopt multicore sheet integrated technology, make radar yield rate and consistance fine, also dwindled the volume of radar simultaneously, overcome defectives such as existing waveguiding structure radar volume is big, poor stability, be suitable for producing in enormous quantities.Adopt the chip integrated technology in addition, can reduce the production cost of radar greatly.
In addition, the present invention utilizes mmic chip and little package technique can reduce the volume of receiver greatly, reduces whole radar volume, weight, improves machine performance, q﹠r, thereby more can satisfy the demand of Hyundai Motor radar.
Description of drawings:
Fig. 1 is the radar front end system chart;
Fig. 2 is the radar antenna structural representation;
Fig. 3 is the contrast figure of antenna standing wave ratio emulation and measurement result;
Fig. 4 is transmitting terminal output power, tuned frequency and the receiving end conversion loss variation diagram with tuning voltage;
Wherein: among Fig. 3 ,-simulated represents simulation result, and measured represents test result
Embodiment:
Further specify the present invention below in conjunction with accompanying drawing.
Shown in Fig. 1 radar front end system chart, resistance power-differential type signal antenna radar front end of the present invention, comprise emitting antenna, receiving antenna and circuit part, described circuit part is a transmitting-receiving subassembly, it links to each other with the intermediate-freuqncy signal disposal system, it is characterized in that transmitting-receiving subassembly comprises voltage controlled oscillator, circulator, resistance, driving amplifier and frequency mixer; Wherein voltage controlled oscillator, circulator and emitting antenna are as transmitting branch; Receiving antenna, circulator and frequency mixer are as receiving branch; Resistance and driving amplifier are as the local oscillator branch road;
By transmitting of voltage controlled oscillator output, the sub-fraction signal distributes through resistance, amplifies through driving amplifier again, and as the local oscillation signal input mixer, most of signal is as transmitting by the circulator emitting antenna of feeding; The echoed signal that receiving antenna receives is carried out mixing through the circulator input mixer with local oscillation signal, produces intermediate-freuqncy signal, and intermediate-freuqncy signal through amplifying and filtering, is transferred to the intermediate-freuqncy signal disposal system again.
Wherein VCO adopts waveguiding structure, and higher output power and phase noise performance are preferably arranged; Driving amplifier adopts the GaAs mmic chip of 0.25um pHEMT processes, and less area is arranged; Described frequency mixer adopts and mixes integrated single balance diode annular frequency mixer, has reduced local oscillation power and cost, and it is on 2.2 the RO5880 compound substance, to adopt diode back-off technology to realize interconnection that frequency mixer is produced on specific inductive capacity; Adopt obedient sheet resistance to divide power technology,, allocate the size of emissive power and local oscillation power flexibly, make system obtain optimum performance by replacing the obedient sheet resistance of different resistances; Each chip input/output terminal and direct current biasing end are connected on the microstrip line figure of substrate with spun gold.The circuit part of entire front end is produced on the thick specific inductive capacity of 0.254mm and is on 2.2 the RO5880 compound substance substrate, and microstrip line is integrated in the wave-guide cavity wave, has reduced loss.
As Fig. 2 radar emission receiving antenna structural drawing, the micro-strip paster antenna that transmits and receives antenna duplexer one 100 gusts (10*10) of radar front end, antenna area is 90mm*90mm, described antenna photoetching is thick at substrate to be on 2.2 the RO5880 compound substance for the 0.254mm specific inductive capacity, adopt the ferrite circulator of microstrip structure to carry out the isolation of transmitting terminal to receiving end, reduce the radar emission receiving area, reduced the volume of radar.It is that 90mm*90mm, thickness are the aluminium sheet both sides of 3mm that the circuit of described radar front end and antenna stick on an area respectively with conducting resinl, and the centre connects with little band-coaxial-little 50 Ω converters of being with.It is 90mm*90mm that described radar front end is contained in area, and the degree of depth is in the metal box of 20mm.
Schemed as can be seen by emulation of Fig. 3 transmit receive antenna and test VSWR (voltage standing wave ratio (VSWR)), the frequency characteristic of simulation result and test result is very consistent, and amplitude characteristic has variation slightly, and this is owing to the processing technology error causes.Antenna has good voltage standing wave ratio (VSWR) at 24GHz, can be successfully applied in the car radar front end.
By Fig. 4 transmitting terminal output power, tuned frequency and receiving end conversion loss as can be seen with the variation diagram of tuning voltage, transmitting terminal has the smooth output power of 11.5dBm, the conversion loss of receiving cable is about 15dB, tuned frequency to the 25.65GHz linear change, has the bandwidth of 250MHz from 25.4GHz.
Claims (10)
1. resistance power-differential type signal antenna radar front end, comprise emitting antenna, receiving antenna and circuit part, described circuit part is a transmitting-receiving subassembly, it links to each other with the intermediate-freuqncy signal disposal system, it is characterized in that transmitting-receiving subassembly comprises voltage controlled oscillator, circulator, resistance, driving amplifier and frequency mixer; Wherein voltage controlled oscillator, circulator and emitting antenna are as transmitting branch; Receiving antenna, circulator and frequency mixer are as receiving branch; Resistance and driving amplifier are as the local oscillator branch road;
By transmitting of voltage controlled oscillator output, the sub-fraction signal distributes through resistance, amplifies through driving amplifier again, and as the local oscillation signal input mixer, most of signal is as transmitting by the circulator emitting antenna of feeding; The echoed signal that receiving antenna receives is carried out mixing through the circulator input mixer with local oscillation signal, produces intermediate-freuqncy signal, and intermediate-freuqncy signal through amplifying and filtering, is transferred to the intermediate-freuqncy signal disposal system again.
2. resistance power-differential type signal antenna radar front end according to claim 1 is characterized in that, described circulator is the ferrite circulator of microstrip structure.
3. resistance power-differential type signal antenna radar front end according to claim 1 is characterized in that, described voltage controlled oscillator adopts waveguiding structure, and driving amplifier adopts the GaAs mmic chip.
4. resistance power-differential type signal antenna radar front end according to claim 1 is characterized in that, described frequency mixer adopts and mixes integrated single balance diode annular frequency mixer.
5. resistance power-differential type signal antenna radar front end according to claim 1 is characterized in that, described frequency mixer adopts diode back-off technology to be produced on the compound substance that specific inductive capacity is 2.2 RO5880.
6. resistance power-differential type signal antenna radar front end according to claim 1 is characterized in that, described resistance adopts obedient chip sheet resistance.
7. resistance power-differential type signal antenna radar front end according to claim 1 is characterized in that, described transmitting antenna and receiving antenna are a shared micro-strip paster antenna, are produced on the antenna substrate.
8. according to each described resistance power-differential type signal antenna radar front end of claim 1 to 7, it is characterized in that, described circuit part is compounded on the circuitry substrate, and described circuit and antenna stick on aluminium sheet both sides respectively with conducting resinl, and is middle with little band-coaxial-microstrip transitions device connection.
9. resistance power-differential type signal antenna radar front end according to claim 8 is characterized in that, described micro-strip paster antenna is 100 gusts of microstrip antennas, and it is produced on specific inductive capacity is that antenna area is 90mm*90mm on 2.2 the RO5880 compound substance.
10. resistance power-differential type signal antenna radar front end according to claim 9, it is characterized in that, circuit part is produced on the thick RO5880 compound substance substrate of 0.254mm, microstrip line is integrated in the wave-guide cavity wave, cavity depth is 2mm, and cavity adds cover plate, and it is that 90mm*90mm, thickness are the aluminium sheet both sides of 3mm that circuit and antenna stick on an area respectively with conducting resinl, the centre connects with little band-coaxial-little 50 Ω converters of being with, and described radar front end is arranged in the metal box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610023116 CN1996043A (en) | 2006-01-05 | 2006-01-05 | Resistance power-differential type signal antenna radar front end |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610023116 CN1996043A (en) | 2006-01-05 | 2006-01-05 | Resistance power-differential type signal antenna radar front end |
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| CN1996043A true CN1996043A (en) | 2007-07-11 |
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| CN 200610023116 Pending CN1996043A (en) | 2006-01-05 | 2006-01-05 | Resistance power-differential type signal antenna radar front end |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897156A (en) * | 2012-10-22 | 2013-01-30 | 安徽省鸿运机械制造有限公司 | Intelligent slowing system for vehicle |
| CN109683169A (en) * | 2019-01-16 | 2019-04-26 | 湖南科技大学 | A kind of distance measurement method and system |
-
2006
- 2006-01-05 CN CN 200610023116 patent/CN1996043A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897156A (en) * | 2012-10-22 | 2013-01-30 | 安徽省鸿运机械制造有限公司 | Intelligent slowing system for vehicle |
| CN109683169A (en) * | 2019-01-16 | 2019-04-26 | 湖南科技大学 | A kind of distance measurement method and system |
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Open date: 20070711 |