CN107276540A - A kind of Terahertz image frequency suppresses mixting circuit - Google Patents
A kind of Terahertz image frequency suppresses mixting circuit Download PDFInfo
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- CN107276540A CN107276540A CN201710680495.0A CN201710680495A CN107276540A CN 107276540 A CN107276540 A CN 107276540A CN 201710680495 A CN201710680495 A CN 201710680495A CN 107276540 A CN107276540 A CN 107276540A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
- H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
Suppress mixting circuit the invention discloses a kind of Terahertz image frequency, including radio frequency 3dB branch-waveguides directional coupler, Terahertz fundamental mixer, local oscillator H face waveguide power dividers and intermediate frequency branch line coupler, the radiofrequency signal of entrance is divided equally into the mutually orthogonal signal of two-way by the radio frequency 3dB branch-waveguides directional coupler, and two Terahertz fundamental mixers are coupled to through waveguide；Oscillating driving signal waveguide is coupled in two Terahertz fundamental mixers by the local oscillator H faces waveguide power divider, the intermediate-freuqncy signal produced in two Terahertz fundamental mixers enters after intermediate frequency branch line coupler, the output of upper sideband intermediate frequency and the output of lower sideband intermediate frequency separated.The present invention realizes by above-mentioned principle and suppresses image frequency in Terahertz frequency range, optimizes receiver noise factor, prevents image frequency from disturbing Terahertz receiver system, and generation is false corresponding, reduces error rate of system.
Description
Technical field
The present invention relates to THz wave field, and in particular to a kind of Terahertz image frequency suppresses mixting circuit.
Background technology
THz wave (Terahertz) refers to frequency range between 0.1~10THz, and wavelength is in the range of 0.03mm~3mm
Electromagnetic wave.It is both transition of the electronics to optical region, is even more transition of the macroscopic view to microscopic theory, this explanation electronics or optics
Theoretical method can attempt use.The special frequency range of Terahertz makes it possess many features：As information capacity is high, resolution ratio
High, room and time coherence is good and characteristic absorption of spectrum etc..These are unique necessarily so that THz wave possesses great
Researching value, be owned by the numerous areas such as radio communication, astronomy, radar remote sensing detection, safety detection and national defence military task huge
Big application prospect.
At present, Terahertz Technology is acknowledged as a very important crossing domain in the world, can be widely applied to
The fields such as high-speed communication, radar monitoring, safety check imaging and biomedical diagnostics.Have benefited from the huge applications space of Terahertz Technology
The characteristics such as THz wave perspectivity, security, transient state, Spectral resolution and broadband.The specific body of good characteristic of THz wave
Present the following aspects：(1) many nonmetallic materials and non-polar material are weaker to the absorbability of THz wave, so that
THz wave is transmitted with less decay from ceramics, fat, plastics, yarn fabric, and this characteristic can apply to detect, be imaged
Deng field；(2) THz wave has good security.Compared with X-ray, THz wave photon energy is low, is not enough to cause
Atomic excitation, saboteur's structure, so that the destruction of ionization is caused to biological tissue, thus as biomedical detection
Desired illumination source；(3) pulsewidth of typical terahertz pulse is suitably applied in precise time resolution techniques and sampling in picosecond
Technology；In terms of signal to noise ratio, terahertz pulse several orders of magnitude higher than far infrared pulse can effectively suppress far infrared ambient noise
Interference；(4) rotation of most of molecules or shock energy rank are all contained in terahertz wave band, and many organic molecules are to Terahertz frequency range
Ripple show absorption and dispersion characteristics, these features make Terahertz frequency range contain abundant spectral information, utilize the characteristic
Organic molecule can be recognized, there is huge application prospect in medical imaging, remote sensing fields；(5) THz wave wavelength is small, frequency model
Enclose from 0.1THz to 10THz, bandwidth resources are enriched；For the communications field, more crowded communications band can be avoided at this stage.
In each application scenarios, the reception technique of terahertz signal is the crucial composition in Terahertz system, and frequency mixer is made
For one of critical component in transceiver, its performance has more important influence to whole system, particularly in Terahertz frequency range, by
In lacking LNA, frequency mixer is usually as the first order circuit of receiver, and its performance will directly determine receiver noise performance.
In Terahertz receiver system, frequency mixer receives ωLO+ωIFOr ωLO-ωIFIt can be produced during two kinds of different radiofrequency signals
Identical intermediate-freuqncy signal, our unwanted radiofrequency signals are referred to as image frequency, because it is in input signal relative to this
Shake the mirror position of signal.The intermediate-freuqncy signal that image frequency is produced after being mixed with local oscillator and the intermediate-freuqncy signal needed are mixed in together
It cannot be distinguished by, the noise coefficient of frequency mixer can be deteriorated.In addition, to some receiver systems, interference signal is there may be on mirror image,
The false response of receiver can be caused.Conventional method suppresses image frequency signal using image frequency wave filter, but this method is often only
Suitable for the situation of high intermediate frequency.It is when signal frequency rises to Terahertz frequency range, the centre frequency for causing wave filter is high, and band
Width is extremely narrow, this very big difficulty that arrived to actual fabrication, is not often considered in engineering.Current existing Terahertz is all solid state mixed
The design for suppressing image frequency is not present in frequency circuit scheme；Meanwhile, using harmonic wave current most of superhets more
Frequency mixer, harmonic mixer needs higher local oscillator driving power, and this can cause circuit power consumption to raise, and cause the heating of device,
Reduce the life-span of device；The limitation of processing conditions is limited by, circuit uses many more in the case of having multiple port input and output
Level circuit configuration, needs multiple substrates and cavity, and need waveguide or probe to connect each circuit in integrated circuit in design.
So the more complicated, cost of design processing is high and with unnecessary transmission loss.
The content of the invention
The technical problems to be solved by the invention are to suppress image frequency in Terahertz frequency range, it is therefore intended that provide one kind too
Hertz image frequency suppresses mixting circuit, realizes and suppresses image frequency in Terahertz frequency range, optimizes receiver noise factor, prevents mirror
As frequency interferences Terahertz receiver system, false corresponding, reduction error rate of system is produced.
The present invention is achieved through the following technical solutions：
A kind of Terahertz image frequency suppresses mixting circuit, including a kind of Terahertz image frequency suppresses mixting circuit, including radio frequency 3dB
Branch-waveguide directional coupler, Terahertz fundamental mixer, local oscillator H face waveguide power dividers and intermediate frequency branch line coupler, it is described
The radiofrequency signal of entrance is divided equally into the mutually orthogonal signal of two-way by radio frequency 3dB branch-waveguides directional coupler, is coupled through waveguide
To two Terahertz fundamental mixers；Oscillating driving signal waveguide is coupled to two terahertzs by the local oscillator H faces waveguide power divider
Hereby in fundamental mixer, the intermediate-freuqncy signal produced in two Terahertz fundamental mixers enters after intermediate frequency branch line coupler, obtains
To the output of upper sideband intermediate frequency and the output of lower sideband intermediate frequency of separation.
In Terahertz frequency range, receiver sensitivity is higher, and frequency band range is larger, and the spurious signal received is more.This hair
It is bright to use local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguides directional coupler that signal is loaded into two with different phases
On individual Terahertz fundamental mixer, constitute image frequency and suppress mixting circuit.Radiofrequency signal ωLO+ωIF(commonly referred to as flash is taken a message
Number) and ωLO-ωIF(commonly referred to as lower sideband signal) is while into radio frequency 3dB branch-waveguide directional couplers, be coupled out two-way
Signal with 90 degree of phase differences, local oscillation signal is two by local oscillator H face waveguide power divider of the branch hybrid without difference
Terahertz fundamental mixer provides local oscillator driving, during the two-way intermediate-freuqncy signal that mixing is produced is passed through on intermediate frequency branch line coupler
The phse conversion of frequency quadrature network, you can distinguish upper sideband intermediate-freuqncy signal and lower sideband intermediate-freuqncy signal, needed for therefrom selecting
Want sideband signals output, it is not necessary to one termination matched load, that is, reached image frequency suppress purpose.
The present invention uses local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguide directional couplers by signal with different
Phase is loaded on two Terahertz fundamental mixers, by the reasonable processing to signal phase, is constituted image frequency and is suppressed mixing electricity
Road, suppresses image frequency, and the interference for preventing image frequency signal from being produced to all solid state receiver of Terahertz produces false response,
The noise coefficient of receiver is improved, error rate of system is reduced, the overall performance of system is improved.
Present invention employs the Terahertz fundamental mixer relatively low to local oscillator driving power demand, spurious signal is few, compression
Point is high, also reduces the power consumption of system.
It is preferred that, the Terahertz fundamental mixer include radio-frequency plumbing-microstrip line, Schottky diode, local oscillator waveguide-
Radio-frequency plumbing-micro- is all connected with microstrip line and intermediate-frequency filter, two output ports of radio frequency 3dB branch-waveguide directional couplers
Band line, is all connected with local oscillator waveguide-microstrip line on two output ports of local oscillator H faces waveguide power divider, radio-frequency plumbing-microstrip line and
Local oscillator waveguide-microstrip line is connected with Schottky diode, and the intermediate-freuqncy signal that mixing is produced is exported via intermediate-frequency filter, intermediate frequency
Filter output connects intermediate frequency branch line coupler.
In order to improve the stability of this circuit, further suppress image frequency, prevent image frequency signal complete to Terahertz
The interference that solid state receiver is produced, produces false response, improves the noise coefficient of receiver, reduces error rate of system, improves system
The overall performance of system, the Schottky diode is multiple diodes of series aiding connection.
It is preferred that, the input signal of the Schottky diode is with TE10Pattern feed-in, the harmonic wave that Schottky diode is produced
Component can in a tem mode be transmitted along microstrip line.Input signal is in input waveguide with TE10Pattern is fed into diode array
In, and the harmonic component produced by diode can in a tem mode be propagated along microstrip line, due to the orthogonality of both patterns,
This structure local oscillator port and prevention at radio-frequency port have very high isolation, prevent signal from mutually revealing, it is achieved thereby that local oscillator end
Mouth and the isolation between prevention at radio-frequency port, improve the performance of circuit.
It is preferred that, intermediate-frequency filter is CMRC low pass filters.(micro-strip of compacting is humorous using CMRC low pass filters for this programme
Shake unit), the resonant element has Slow-wave effect and resonance band gap properties, can significantly improve terahertz filter circuit
Can, while the structure has size small, processing technology is simple, it is easy to the features such as designing.
It is preferred that, the radio frequency 3dB branch-waveguides directional coupler is constituted based on standard waveguide WR-4.3, is a kind of four end
The close coupling quadrature hybrid electric bridge of mouth, is made up of input port 1, straight-through port 2, coupling port 3 and isolated port 4, wherein
Straight-through end and coupled end are as output port, and two-way output port signal has 90 ° of phase difference.
It is preferred that, the isolated port 4 connects matched load.
In order to avoid the arrangement of multi-level pmultistage circuit, local oscillator H faces wave guide power point is processed in vertical direction using 3D printing technique
Device.Using 3D printing technique processing local oscillator H faces waveguide power divider, it not only can greatly reduce traditional micromachined cut-out wall
Transmission loss caused by electric current, reduces the insertion loss of circuit, can more make circuit from conventional planar circuit to novel solid
Circuit structure changes.This novel solid circuit structure causes the microstrip line construction of Medium link loop circuit and frequency mixer to build
Be directly connected in approximately the same plane, rationally make use of the space of inside modules, it is to avoid multilayer circuit arrangement it is cumbersome, effectively
Simplify circuit design and processing, reduce transition structure, it is cost-effective, reduce the loss inside circuit；The local oscillator H faces ripple
It is the local oscillator H faces Y type waveguide power dividers processed using 3D printing technique to lead power splitter.
It is preferred that, the local oscillator H faces waveguide power divider is constituted based on standard waveguide WR-4.3.
In order to realize matching properties that power splitter is good in broadband, overall circuit performance is lifted, wedge structure is adjusted
Length and height can realize power splitter matching properties good in broadband；The work(of the local oscillator H faces waveguide power divider point end
Mouth is triangular wedge structure, and the length and height of triangular wedge structure can be adjusted.
The present invention compared with prior art, has the following advantages and advantages：
1st, the present invention uses local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguide directional couplers by signal with difference
Phase be loaded on two Terahertz fundamental mixers, pass through the reasonable processing to signal phase, constitute image frequency suppress mixing
Circuit, suppresses image frequency, and the interference for preventing image frequency signal from being produced to all solid state receiver of Terahertz produces false ring
Should, the noise coefficient of receiver is improved, error rate of system is reduced, the overall performance of system is improved.
2nd, present invention employs the Terahertz fundamental mixer relatively low to local oscillator driving power demand, spurious signal is few, pressure
Point reduction is high, also reduces the power consumption of system.
3rd, the present invention using CMRC low pass filters (compact micro-band resonance unit), the resonant element have Slow-wave effect and
Resonance band gap properties, can significantly improve terahertz filter circuit performance, while the structure has size small, processing technology letter
It is single, it is easy to the features such as designing.
4th, the present invention not only can greatly reduce tradition micro- using 3D printing technique processing local oscillator H faces waveguide power divider
Transmission loss caused by machining cut-out wall electric current, reduces the insertion loss of circuit, can more make circuit from conventional planar
Circuit changes to novel solid circuit structure；This novel solid circuit structure causes the micro- of Medium link loop circuit and frequency mixer
Strip line structure can build and is directly connected in approximately the same plane, rationally make use of the space of inside modules, it is to avoid multilayer circuit
Cumbersome, effectively simplified circuit design and the processing of arrangement, reduce transition structure, cost-effective, reduce the damage inside circuit
Consumption.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention；
Fig. 2 is Schottky diode structure schematic diagram；
Fig. 3 is Terahertz fundamental mixer structural representation；
Fig. 4 is intermediate-frequency filter structural representation；
Fig. 5 is radio frequency 3dB branch-waveguide directional coupling structure schematic diagrames；
Fig. 6 is radio frequency 3dB branch-waveguide directional coupler simulation results；
Fig. 7 is local oscillator H faces waveguide power divider structural representation；
Fig. 8 is local oscillator H faces waveguide power divider simulation result；
Fig. 9 is intermediate frequency branch line coupler structural representation.
Mark and corresponding parts title in accompanying drawing：
1st, radio frequency 3dB branch-waveguides directional coupler；2nd, radio-frequency plumbing-microstrip line；3rd, Terahertz fundamental mixer；4th, Xiao
Special based diode；5th, upper sideband IF output signal；6th, local oscillator H faces waveguide power divider；7th, local oscillator waveguide-microstrip line；8th, intermediate frequency
Wave filter；9th, intermediate frequency branch line coupler；10th, lower sideband IF output signal.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment 1：
As shown in figs 1-9, the present invention includes a kind of Terahertz image frequency suppression mixting circuit, including radio frequency 3dB branch-waveguides
Directional coupler 1, Terahertz fundamental mixer 3, local oscillator H faces waveguide power divider 6 and intermediate frequency branch line coupler 9, the radio frequency
The radiofrequency signal of entrance is divided equally into the mutually orthogonal signal of two-way by 3dB branch-waveguides directional coupler 1, and two are coupled to through waveguide
Individual Terahertz fundamental mixer 3；Oscillating driving signal waveguide is coupled to two Terahertzs by the local oscillator H faces waveguide power divider 6
In fundamental mixer 3, the intermediate-freuqncy signal produced in two Terahertz fundamental mixers 3 enters after intermediate frequency branch line coupler 9, obtains
Upper sideband intermediate frequency to separation exports 5 and lower sideband intermediate frequency output 10.
In each application scenarios, the reception technique of terahertz signal is the crucial composition in Terahertz system, and frequency mixer is made
For one of critical component in transceiver, its performance has more important influence to whole system, particularly in Terahertz frequency range, by
In lacking LNA, first order circuit of batch device usually as receiver is mixed, its performance will directly determine receiver noise performance.
In Terahertz receiver system, noise of image can deteriorate the noise coefficient of frequency mixer.In addition, to some receiver systems, mirror
Interference signal is there may be on picture, the false response of receiver can be caused.
In Terahertz frequency range, receiver sensitivity is higher, and frequency band range is larger, and the spurious signal received is more.This hair
It is bright to use local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguides directional coupler that signal is loaded into two with different phases
On individual Terahertz fundamental mixer, constitute image frequency and suppress mixting circuit.Radiofrequency signal ωLO+ωIF(commonly referred to as flash is taken a message
Number) and ωLO-ωIF(commonly referred to as lower sideband signal) is while into radio frequency 3dB branch-waveguide directional couplers, be coupled out two-way
Signal with 90 degree of phase differences, local oscillation signal is two by local oscillator H face waveguide power divider of the branch hybrid without difference
Terahertz fundamental mixer provides local oscillator driving, during the two-way intermediate-freuqncy signal that mixing is produced is passed through on intermediate frequency branch line coupler
The phse conversion of frequency quadrature network, you can distinguish upper sideband intermediate-freuqncy signal and lower sideband intermediate-freuqncy signal, needed for therefrom selecting
Want sideband signals output, it is not necessary to one termination matched load, that is, reached image frequency suppress purpose.
The present invention uses local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguide directional couplers by signal with different
Phase is loaded on two Terahertz fundamental mixers, by the reasonable processing to signal phase, is constituted image frequency and is suppressed mixing electricity
Road, suppresses image frequency, and the interference for preventing image frequency signal from being produced to all solid state receiver of Terahertz produces false response,
The noise coefficient of receiver is improved, error rate of system is reduced, the overall performance of system is improved.
Present invention employs the Terahertz fundamental mixer relatively low to local oscillator driving power demand, spurious signal is few, compression
Point is high, also reduces the power consumption of system.
Embodiment 2：
As shown in figure 3, the present embodiment is preferably as follows on the basis of embodiment 1：Terahertz fundamental mixer 3 includes radio frequency
Waveguide-microstrip line 2, Schottky diode 4, local oscillator waveguide-microstrip line 7 and intermediate-frequency filter 8, radio frequency 3dB branch-waveguides orientation
Radio-frequency plumbing-microstrip line 2, two output ends of local oscillator H faces waveguide power divider 6 are all connected with two output ports of coupler 1
Local oscillator waveguide-microstrip line 7 is all connected with mouthful, and radio-frequency plumbing-microstrip line 2 and local oscillator waveguide-microstrip line 7 are and Schottky diode
4 connections, the intermediate-freuqncy signal that mixing is produced is exported via intermediate-frequency filter 8, the output end of intermediate-frequency filter 8 connection intermediate frequency branch line coupling
Clutch 9.Radio-frequency plumbing-microstrip line 2 therein and local oscillator waveguide-microstrip line 7 subtract high form using waveguide can make matching more
Plus it is good.Terahertz fundamental mixer is made up of prevention at radio-frequency port transition, the transition of local oscillator port, the part of mid-frequency low-pass wave filter three,
The ground connection for realizing radio frequency and direct current is fully contacted by microstrip line and upper cavity in radio frequency transitioning end.
As shown in Fig. 2 Schottky diode 4 is multiple diodes of series aiding connection.Schottky diode is that Terahertz is complete
The core devices of solid-state frequency mixer, it has noise small, with roomy, working stability, the characteristics of simple in construction and cut-off frequency is high.
In Terahertz frequency range wavelength very little, the wavelength of electromagnetic wave is close with the physical size of diode, the structure of diode and encapsulation meeting
Cause ghost effect, the parasitic parameter of each several part has important influence to its nonlinear characteristic.In circuit simulation, it is necessary to consider
The parasitic parameters such as parasitic capacitance, stray inductance.Therefore it is to be highly desirable to set up planar Schottky mixer tube Three-Dimensional Electromagnetic Model
, the diode that this frequency mixer is used improves the stability of this circuit for series aiding connection diode, further suppresses mirror image frequency
Rate, the interference for preventing image frequency signal from being produced to all solid state receiver of Terahertz produces false response, improves making an uproar for receiver
Sonic system number, reduces error rate of system, improves the overall performance of system.
The input signal of Schottky diode 4 is in input waveguide with TE10Pattern feed-in, what Schottky diode 4 was produced
Harmonic component can in a tem mode be transmitted along microstrip line.Input signal is in input waveguide with TE10Pattern is fed into diode battle array
In row, and the harmonic component produced by diode can in a tem mode be propagated along microstrip line, orthogonal due to both patterns
Property, this structure local oscillator port and prevention at radio-frequency port have very high isolation, prevent signal from mutually revealing, it is achieved thereby that local oscillator
Isolation between port and prevention at radio-frequency port, improves the performance of circuit.
As shown in figure 4, intermediate-frequency filter 8 is CMRC low pass filters.Output end using 50 ohm microstrip impedance lines realize,
Suppress the characteristic of parasitic passband with broadband, so harmonic signal, local oscillation signal, radiofrequency signal can be prevented defeated by Mid Frequency
Go out and be reflected back towards, improve frequency multiplication and mixing efficiency；Wherein standard waveguide WR-4.3 has the effect for suppressing low frequency signal,
Therefore intermediate-freuqncy signal, local oscillation signal, fundamental signal will not be exported from radio-frequency head.This programme (is compacted using CMRC low pass filters
Micro-band resonance unit), the resonant element has Slow-wave effect and resonance band gap properties, can significantly improve terahertz filter electricity
Road performance, while the structure has size small, processing technology is simple, it is easy to the features such as designing.
In Terahertz frequency range, circuit size is strongly reduced, and causes conventional microstrip line coupler processing difficulties.Waveguide bridge is
It is a kind of it is very conventional the circuit structure of power distribution/synthesis can be realized in terahertz wave band, and branch-waveguide is oriented
Coupler is a kind of close coupling quadrature hybrid electric bridge of four port, and with each port match, that isolation is high, insertion loss is small etc. is excellent
Point, improves the deficiency of three port elements, and the characteristic with high power capacity, it is had very in high-power synthesis
High application potential.Radio frequency 3dB branch-waveguides directional coupler 1 in this programme is constituted based on standard waveguide WR-4.3, is one
The close coupling quadrature hybrid electric bridge of four ports is planted, by 4 groups of input port 1, straight-through port 2, coupling port 3 and isolated port
Into wherein straight-through end and coupled end are as output port, and two-way output port signal has 90 ° of phase difference.The present invention makes
With the classical branch line coupler model based on microstrip line, its structure as illustrated, when intermediate-freuqncy signal is respectively by port 1 and end
Mouth 4 enters after branch line coupler circuit, and 2 ports are output as lower sideband signal, and 3 ports are output as flash band signal, two sides
There is 90 degree of phase shift in band, we can select the sideband needed as needed, connect external bias in another sideband, you can reach
To the effect for suppressing image frequency.
As seen in figs. 5-6, by simulation result it can be seen that radio frequency 3dB branch-waveguide directional coupler return losses are in frequency band
Substantially it is better than 20dB in the range of 200GHz~240GHz, insertion loss is less than 0.1dB, it is also seen that between port 2 and port 3
Phase difference is essentially 90 degree.Good transmission performance make it that radiofrequency signal can be with less loss in wider frequency band range
It is loaded on two frequency mixers.
The isolated port 4 connects matched load.To allow other port normal works.
The course of work：Radiofrequency signal is divided equally into the mutually orthogonal letter of two-way by radio frequency 3dB branch-waveguides directional coupler 1
Number, signal subtracts height through waveguide and is coupled to microstrip line into two Terahertz fundamental mixers 3；Wherein oscillating driving signal is by local oscillator
H faces waveguide power divider 6 enters, and signal subtracts height through waveguide and is coupled to microstrip line into Terahertz fundamental mixer 3；Wherein radio frequency is believed
Number and local oscillation signal via fundamental mixer local oscillator and prevention at radio-frequency port feed-in Schottky diode 4 participate in be mixed, mixing produce
Each harmonic component filtered by intermediate-frequency filter 8, only intermediate frequency component export, the intermediate-freuqncy signal of generation is respectively via respective
Mid-frequency low-pass wave filter is exported, into intermediate frequency branch line coupler 9；Wherein intermediate frequency branch line coupler 9 assume responsibility for phse conversion
With the effect of biasing, direct current biasing is on wherein one branch line of shorting pin loaded to branch line coupler, because circuit substrate is
It is connected, just provides direct current biasing for two fundamental mixers 3；Radiofrequency signal orients coupling due to radio frequency 3dB branch-waveguides
The effect of clutch 1, is coupled out signal of the two-way with 90 degree of phase differences, and local oscillation signal is loaded into Terahertz fundamental mixer in the same direction
On, the phse conversion for the intermediate frequency quadrature circuit that the two-way intermediate-freuqncy signal that mixing is produced is passed through on intermediate-frequency filter, you can by flash
Band intermediate-freuqncy signal and lower sideband intermediate-freuqncy signal distinguish, therefrom select required sideband signals to export, it is not necessary to sideband connect
Matched load, that is, reached the purpose that image frequency suppresses.
Embodiment 3：
As shown in fig. 7, the present embodiment is preferably as follows on the basis of above-described embodiment：Local oscillator H faces waveguide power divider is to adopt
The local oscillator H faces Y type waveguide power dividers processed with 3D printing technique.In order to avoid the arrangement of multi-level pmultistage circuit, 3D printing technique is utilized
Local oscillator H faces waveguide power divider is processed in vertical direction.Using 3D printing technique processing local oscillator H faces waveguide power divider, not only may be used
Greatly to reduce transmission loss caused by traditional micromachined cut-out wall electric current, the insertion loss of circuit is reduced, more may be used
So that circuit changes from conventional planar circuit to novel solid circuit structure.This novel solid circuit structure causes Medium link
The microstrip line construction of loop circuit and frequency mixer can build and is directly connected in approximately the same plane, rationally make use of the sky of inside modules
Between, it is to avoid multilayer circuit arrangement it is cumbersome, effectively simplify circuit design and processing, reduce transition structure, it is cost-effective, subtract
The loss inside circuit is lacked.
Local oscillator H faces waveguide power divider is constituted based on standard waveguide WR-4.3.
The work(of local oscillator H faces waveguide power divider point port is triangular wedge structure, and the length and height of triangular wedge structure can be adjusted
It is whole.Power splitter matching properties good in broadband are realized, overall circuit performance is lifted, the length and height for adjusting wedge structure can
To realize matching properties that power splitter is good in broadband.As shown in figure 8, can be seen that H faces Y type wave guide powers by simulation result
Dividing device return loss, (170GHz~260GHz) realizes good transporting similarly in standard waveguide WR4.3 Whole frequency band
Can, to realize that broadband and low consumption mixting circuit has established good basis.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (10)
1. a kind of Terahertz image frequency suppresses mixting circuit, it is characterised in that including radio frequency 3dB branch-waveguides directional coupler (1),
Terahertz fundamental mixer (3), local oscillator H faces waveguide power divider (6) and intermediate frequency branch line coupler (9), the radio frequency 3dB branches
The radiofrequency signal of entrance is divided equally into the mutually orthogonal signal of two-way by guide directional coupler (1), and two are coupled to too through waveguide
Hertz fundamental mixer (3)；Oscillating driving signal waveguide is coupled to two Terahertzs by the local oscillator H faces waveguide power divider (6)
In fundamental mixer (3), the intermediate-freuqncy signal produced in two Terahertz fundamental mixers (3) enters intermediate frequency branch line coupler
(9) the upper sideband intermediate frequency output (5) separated after and lower sideband intermediate frequency output (10).
2. a kind of Terahertz image frequency according to claim 1 suppresses mixting circuit, it is characterised in that the Terahertz fundamental wave
Frequency mixer (3) includes radio-frequency plumbing-microstrip line (2), Schottky diode (4), local oscillator waveguide-microstrip line (7) and intermediate frequency filtering
Radio-frequency plumbing-microstrip line (2) is all connected with device (8), two output ports of radio frequency 3dB branch-waveguides directional coupler (1), this
Shake H faces waveguide power divider (6) two output ports on be all connected with local oscillator waveguide-microstrip line (7), radio-frequency plumbing-microstrip line (2)
It is connected with local oscillator waveguide-microstrip line (7) with Schottky diode (4), is mixed the intermediate-freuqncy signal produced via intermediate-frequency filter
(8) export, intermediate-frequency filter (8) output end connection intermediate frequency branch line coupler (9).
3. a kind of Terahertz image frequency according to claim 2 suppresses mixting circuit, it is characterised in that the pole of Schottky two
Manage multiple diodes that (4) are series aiding connection.
4. a kind of Terahertz image frequency according to Claims 2 or 3 suppresses mixting circuit, it is characterised in that the Schottky
The input signal of diode (4) is with TE10Pattern feed-in, Schottky diode (4) produce harmonic component can along microstrip line with
TEM mode is transmitted.
5. a kind of Terahertz image frequency according to Claims 2 or 3 suppresses mixting circuit, it is characterised in that intermediate-frequency filter
(8) it is CMRC low pass filters.
6. a kind of Terahertz image frequency according to claim 1 suppresses mixting circuit, it is characterised in that the radio frequency 3dB points
Branch guide directional coupler (1) is constituted based on standard waveguide WR-4.3, is a kind of close coupling quadrature hybrid electric bridge of four port, by
Input port 1, straight-through port 2, coupling port 3 and isolated port 4 are constituted, wherein straight-through end and coupled end are used as output end
Mouthful, and there is 90 ° of phase difference in two-way output port signal.
7. a kind of Terahertz image frequency according to claim 6 suppresses mixting circuit, it is characterised in that the isolated port 4
Connect matched load.
8. a kind of Terahertz image frequency according to claim 1 suppresses mixting circuit, it is characterised in that the local oscillator H faces ripple
It is the local oscillator H faces Y type waveguide power dividers processed using 3D printing technique to lead power splitter.
9. a kind of Terahertz image frequency according to claim 1 or 8 suppresses mixting circuit, it is characterised in that the local oscillator H faces
Waveguide power divider is constituted based on standard waveguide WR-4.3.
10. a kind of Terahertz image frequency according to claim 1 or 8 suppresses mixting circuit, it is characterised in that the local oscillator H
The work(of face waveguide power divider point port is triangular wedge structure, and the length and height of triangular wedge structure can be adjusted.
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| CN115225109A (en) * | 2022-09-20 | 2022-10-21 | 电子科技大学(深圳)高等研究院 | Terahertz frequency division duplex I/Q modulation-demodulation transceiving front end |
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