CN207321210U - 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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- CN207321210U CN207321210U CN201720996491.9U CN201720996491U CN207321210U CN 207321210 U CN207321210 U CN 207321210U CN 201720996491 U CN201720996491 U CN 201720996491U CN 207321210 U CN207321210 U CN 207321210U
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Abstract
The utility model discloses a kind of Terahertz image frequency to suppress mixting circuit, 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, is coupled to two Terahertz fundamental mixers through waveguide；Oscillating driving signal waveguide is coupled in two Terahertz fundamental mixers by the local oscillator H faces waveguide power divider, after the intermediate-freuqncy signal produced in two Terahertz fundamental mixers enters intermediate frequency branch line coupler, the separated output of upper sideband intermediate frequency and the output of lower sideband intermediate frequency are obtained.The utility model realizes by above-mentioned principle and suppresses image frequency in Terahertz frequency range, optimize receiver noise factor, prevent image frequency from disturbing Terahertz receiver system, produce false response, reduce error rate of system.
Description
Technical field
It the utility model is related 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 to 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 the characteristic absorption of spectrum etc..It is great that these uniquenesses necessarily make it that THz wave possesses
Researching value, be owned by the numerous areas such as wireless 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, this characteristic can be applied 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
It can identify organic molecule, 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, communications band more crowded at this stage can be avoided.
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 whole system more important influence, particularly in Terahertz frequency range, by
In lacking low noise, for frequency mixer usually as the first order circuit of receiver, 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, we are known as image frequency at unwanted radiofrequency signal, because it is in input signal relative to this
Shake the mirror position of signal.The intermediate-freuqncy signal that image frequency produces 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, there may be interference signal 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
Wide extremely narrow, this very big difficulty that arrives to actual fabrication, is not often considered in engineering.Current existing Terahertz is all solid state mixed
There is no the designing scheme for suppressing image frequency for frequency circuit scheme；Meanwhile most of superhets use harmonic wave more at present
Frequency mixer, harmonic mixer need higher local oscillator driving power, this can cause circuit power consumption to raise, and cause the fever of device,
Reduce the service life of device；The limitation of processing conditions is limited by, circuit uses more more in the case of having multiple port input and output
Level circuit configuration, needs multiple substrates and cavity in integrated circuit in design, and need waveguide or probe to connect each circuit.
So design processing is more complicated, of high cost and has unnecessary transmission loss.
Utility model content
Technical problem to be solved in the utility model is to suppress image frequency, and it is an object of the present invention to provide one in Terahertz frequency range
Kind Terahertz image frequency suppresses mixting circuit, realizes and suppresses image frequency in Terahertz frequency range, optimizes receiver noise factor, prevents
Only image frequency interference Terahertz receiver system, produces false response, reduces error rate of system.
The utility model is achieved through the following technical solutions：
A kind of Terahertz image frequency suppresses mixting circuit, including radio frequency 3dB branch-waveguides directional coupler, Terahertz fundamental wave mix
Frequency device, local oscillator H face waveguide power dividers and intermediate frequency branch line coupler, the radio frequency 3dB branch-waveguides directional coupler will enter
Radiofrequency signal be divided equally into the mutually orthogonal signal of two-way, be coupled to two Terahertz fundamental mixers through waveguide；The local oscillator H
Oscillating driving signal waveguide is coupled in two Terahertz fundamental mixers by face waveguide power divider, two Terahertz fundamental wave mixings
After the intermediate-freuqncy signal produced in device enters intermediate frequency branch line coupler, separated upper sideband intermediate frequency output and lower sideband intermediate frequency are obtained
Output.
In Terahertz frequency range, receiver sensitivity is higher, and frequency range is larger, and the received spurious signal of institute is more.This reality
Local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguides directional coupler is used to load signal with different phases with new
Onto two Terahertz fundamental mixers, form image frequency and suppress mixting circuit.Radiofrequency signal ωLO+ωIF(commonly referred to as upper sideband
Signal) and ωLO-ωIF(commonly referred to as lower sideband signal) while enter radio frequency 3dB branch-waveguide directional couplers, be coupled out
Two-way has the signal of 90 degree of phase differences, and local oscillation signal is by local oscillator H faces waveguide power divider of the branch hybrid without difference
Two Terahertz fundamental mixers provide local oscillator driving, are mixed the two-way intermediate-freuqncy signal of generation by intermediate frequency branch line coupler
Intermediate frequency quadrature circuit phse conversion, you can upper sideband intermediate-freuqncy signal and lower sideband intermediate-freuqncy signal are distinguished, therefrom selected
The output of required sideband signals, it is not necessary to a termination matched load, that is, achieveed the purpose that image frequency suppresses.
The utility model uses local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguide directional couplers by signal with not
Same phase is loaded on two Terahertz fundamental mixers, by the reasonable processing to signal phase, is formed image frequency and is suppressed to mix
Frequency circuit, suppresses image frequency, 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, reduces error rate of system, improves the overall performance of system.
The utility model employs the Terahertz fundamental mixer relatively low to local oscillator driving power demand, and spurious signal is few,
Compression point is high, also reduces the power consumption of system.
Preferably, the Terahertz fundamental mixer include radio-frequency plumbing-microstrip line, Schottky diode, local oscillator waveguide-
Microstrip line and intermediate-frequency filter, radio-frequency plumbing-micro- is all connected with 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 for being mixed generation 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 that image frequency signal is complete to Terahertz
The interference that solid state receiver produces, produces false response, improves the noise coefficient of receiver, reduces error rate of system, improves system
The overall performance of system, the Schottky diode are multiple diodes of series aiding connection.
Preferably, the input signal of the Schottky diode is with TE10Pattern feed-in, the harmonic wave that Schottky diode produces
Component can transmit in a tem mode along microstrip line.Input signal is in input waveguide with TE10Pattern is fed into diode array
In, and can be propagated in a tem mode along microstrip line by the harmonic component that diode produces, 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.
Preferably, intermediate-frequency filter is CMRC low-pass filters.(micro-strip of compacting is humorous using CMRC low-pass filters for this programme
Shake unit), which has Slow-wave effect and resonance band gap properties, can significantly improve terahertz filter circuit
Can, while the structure has the features such as size is small, and processing technology is simple, easily designed.
Preferably, the radio frequency 3dB branch-waveguides directional coupler is formed based on standard waveguide WR-4.3, is a kind of four ends
The close coupling quadrature hybrid electric bridge of mouth, is made 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 there are 90 ° of phase difference for two-way output port signal.
Preferably, 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
It is directly connected in the same plane, rationally make use of the space of inside modules, avoids the cumbersome of multilayer circuit arrangement, effectively
Simplify circuit design and processing, reduce transition structure, it is cost-effective, reduce the loss inside circuit；The local oscillator H surface waves
It is the local oscillator H faces Y type waveguide power dividers processed using 3D printing technique to lead power splitter.
Preferably, the local oscillator H faces waveguide power divider is formed based on standard waveguide WR-4.3.
In order to realize power splitter matching properties good in broadband, overall circuit performance is lifted, adjusts wedge structure
Length and high 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 adjust.
The utility model compared with prior art, has the following advantages and advantages：
1st, the utility model use local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguides directional coupler by signal with
Different phases is loaded on two Terahertz fundamental mixers, by the reasonable processing to signal phase, is formed image frequency and is suppressed
Mixting circuit, suppresses image frequency, the interference for preventing image frequency signal from being produced to all solid state receiver of Terahertz, produces false
Response, improves the noise coefficient of receiver, reduces error rate of system, improves the overall performance of system.
2nd, the utility model employs the Terahertz fundamental mixer relatively low to local oscillator driving power demand, spurious signal
Few, compression point is high, also reduces the power consumption of system.
3rd, the utility model uses CMRC low-pass filters (compact micro-band resonance unit), which imitates with slow wave
Terahertz filter circuit performance should can be significantly improved, while the structure has size small, processes work with resonance band gap properties
Skill is simple, it is easily designed the features such as.
4th, the utility model not only can greatly reduce biography using 3D printing technique processing local oscillator H faces waveguide power divider
Transmission loss caused by micromachined of uniting cut-out wall electric current, reduces the insertion loss of circuit, can more make circuit from tradition
Planar circuit changes to novel solid circuit structure；This novel solid circuit structure causes Medium link loop circuit and frequency mixer
Microstrip line construction can build and be directly connected in the same plane, rationally make use of the space of inside modules, avoid multilayer
Circuit configuration it is cumbersome, effectively simplify circuit design and processing, reduce transition structure, it is cost-effective, reduce inside circuit
Loss.
Brief description of the drawings
Attached drawing described herein is used for providing further understanding the utility model embodiment, forms the one of the application
Part, does not form the restriction to the utility model embodiment.In the accompanying drawings：
Fig. 1 is the utility model structure diagram；
Fig. 2 is Schottky diode structure schematic diagram；
Fig. 3 is Terahertz fundamental mixer structure diagram；
Fig. 4 is intermediate-frequency filter structure diagram；
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 leads structure schematic diagram for local oscillator H surface waves；
Fig. 8 is local oscillator H faces waveguide power divider simulation result；
Fig. 9 is intermediate frequency branch line coupler structure diagram.
Mark and corresponding parts title in attached 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 purpose of this utility model, technical solution and advantage is more clearly understood, with reference to embodiment and attached drawing,
The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this
Utility model, is not intended to limit the scope of the present invention.
Embodiment 1：
As shown in figs 1-9, the utility model includes a kind of Terahertz image frequency suppression mixting circuit, including radio frequency 3dB branches
Guide directional coupler 1, Terahertz fundamental mixer 3, local oscillator H faces waveguide power divider 6 and intermediate frequency branch line coupler 9, 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 1, is coupled through waveguide
To two Terahertz fundamental mixers 3；Oscillating driving signal waveguide is coupled to two too by the local oscillator H faces waveguide power divider 6
In hertz fundamental mixer 3, the intermediate-freuqncy signal produced in two Terahertz fundamental mixers 3 enters intermediate frequency branch line coupler 9
Afterwards, separated upper sideband intermediate frequency output 5 and lower sideband intermediate frequency output 10 are obtained.
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 whole system more important influence, particularly in Terahertz frequency range, by
In lacking low noise, 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
There may be interference signal as on, the false response of receiver can be caused.
In Terahertz frequency range, receiver sensitivity is higher, and frequency range is larger, and the received spurious signal of institute is more.This reality
Local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguides directional coupler is used to load signal with different phases with new
Onto two Terahertz fundamental mixers, form image frequency and suppress mixting circuit.Radiofrequency signal ωLO+ωIF(commonly referred to as upper sideband
Signal) and ωLO-ωIF(commonly referred to as lower sideband signal) while enter radio frequency 3dB branch-waveguide directional couplers, be coupled out
Two-way has the signal of 90 degree of phase differences, and local oscillation signal is by local oscillator H faces waveguide power divider of the branch hybrid without difference
Two Terahertz fundamental mixers provide local oscillator driving, are mixed the two-way intermediate-freuqncy signal of generation by intermediate frequency branch line coupler
Intermediate frequency quadrature circuit phse conversion, you can upper sideband intermediate-freuqncy signal and lower sideband intermediate-freuqncy signal are distinguished, therefrom selected
The output of required sideband signals, it is not necessary to a termination matched load, that is, achieveed the purpose that image frequency suppresses.
The utility model uses local oscillator H face waveguide power dividers and radio frequency 3dB branch-waveguide directional couplers by signal with not
Same phase is loaded on two Terahertz fundamental mixers, by the reasonable processing to signal phase, is formed image frequency and is suppressed to mix
Frequency circuit, suppresses image frequency, 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, reduces error rate of system, improves the overall performance of system.
The utility model employs the Terahertz fundamental mixer relatively low to local oscillator driving power demand, and 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 terminals 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 for being mixed generation are exported via intermediate-frequency filter 8,8 output terminal of intermediate-frequency filter connection intermediate frequency branch line
Coupler 9.Radio-frequency plumbing-microstrip line 2 therein and local oscillator waveguide-microstrip line 7 subtract high form using waveguide can make matching
It is better.Terahertz fundamental mixer is by prevention at radio-frequency port transition, the transition of local oscillator port, mid-frequency low-pass wave filter three parts group
Into the ground connection for realizing radio frequency and direct current is come into full contact with 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 structure and cutoff 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 its nonlinear characteristic important influence.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 establish planar Schottky mixer tube Three-Dimensional Electromagnetic Model
, the diode that this frequency mixer uses 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 produced
Harmonic component can be transmitted in a tem mode along microstrip line.Input signal is in input waveguide with TE10Pattern is fed into diode battle array
In row, and it can be propagated in a tem mode along microstrip line by the harmonic component that diode produces, it is 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 terminal using 50 ohm microstrip impedance lines realize,
Suppress the characteristic of parasitic passband with broadband, can so prevent harmonic signal, local oscillation signal, radiofrequency signal 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 function that suppression 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), which has Slow-wave effect and resonance band gap properties, can significantly improve terahertz filter electricity
Road performance, while the structure has the features such as size is small, and processing technology is simple, easily designed.
In Terahertz frequency range, circuit size strongly reduces, and causes conventional microstrip line coupler processing difficulties.Waveguide bridge is
A kind of very common circuit structure that power distribution/synthesis can be realized in terahertz wave band, and branch-waveguide orients
Coupler is a kind of close coupling quadrature hybrid electric bridge of four port, and it is excellent to have that each port match, isolation are high, insertion loss is small etc.
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 formed based on standard waveguide WR-4.3, is one
The close coupling quadrature hybrid electric bridge of four ports of kind, by 4 groups of input port 1, straight-through port 2, coupling port 3 and isolated port
Into wherein straight-through hold with coupled end as output port, and there are 90 ° of phase difference for two-way output port signal.This practicality is new
Type has used the classical branch line coupler model based on microstrip line, its structure is as shown in the figure, when intermediate-freuqncy signal is respectively by port 1
After entering branch line coupler circuit with port 4, the output of 2 ports be lower sideband signal, and it is flash band signal that 3 ports, which export, two
There are 90 degree of phase shift, we can select the sideband needed as needed, connect external bias in another sideband, i.e., a sideband
It can reach 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
It is better than 20dB substantially 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 be essentially 90 degree.Good transmission performance make it that radiofrequency signal can be with less damage in wider frequency range
Consumption is loaded on two frequency mixers.
The isolated port 4 connects matched load.To allow other ports to work normally.
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, which through waveguide subtracts height and is coupled to microstrip line, enters two Terahertz fundamental mixers 3；Wherein oscillating driving signal is by local oscillator
H faces waveguide power divider 6 enters, and signal, which through waveguide subtracts height and is coupled to microstrip line, enters 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 mixing, mixing produce
Each harmonic component filtered by intermediate-frequency filter 8, only intermediate frequency component output, the intermediate-freuqncy signal of generation is respectively via respective
Mid-frequency low-pass wave filter exports, 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 by shorting pin loaded to branch line coupler wherein on a branch line, since 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 wave mixing in the same direction
On device, the two-way intermediate-freuqncy signal of generation is mixed by the phse conversion of the intermediate frequency quadrature circuit on intermediate-frequency filter, you can by height
Sideband intermediate-freuqncy signal and lower sideband intermediate-freuqncy signal distinguish, and therefrom select required sideband signals to export, it is not necessary to sideband
Matched load is connect, that is, has achieveed 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 techniques.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 cuts off 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 be directly connected in the same plane, rationally make use of the sky of inside modules
Between, the cumbersome of multilayer circuit arrangement is avoided, effectively simplifies circuit design and processing, reduces transition structure, it is cost-effective, subtract
The loss inside circuit is lacked.
Local oscillator H faces waveguide power divider is formed based on standard waveguide WR-4.3.
The work(of local oscillator H faces waveguide power divider divides port to be triangular wedge structure, and the length and height of triangular wedge structure can be adjusted
It is whole.Realize power splitter matching properties good in broadband, lift overall circuit performance, the length and height for adjusting wedge structure can
To realize power splitter matching properties good in broadband.As shown in figure 8, H faces Y type wave guide powers can be seen that by simulation result
Dividing device return loss, (170GHz~260GHz) realizes good transporting similarly in the Whole frequency band of standard waveguide WR4.3
Can, to realize that broadband and low consumption mixting circuit has established good basis.
Above-described embodiment, the purpose of this utility model, technical solution and beneficial effect have been carried out into
One step describes in detail, it should be understood that the foregoing is merely specific embodiment of the present utility model, is not used to limit
Determine the scope of protection of the utility model, where within the spirit and principles of the present invention, any modification for being made, equally replace
Change, improve, should be included within the scope of protection of this utility model.
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), is coupled to two 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) after, separated upper sideband intermediate frequency output (5) and lower sideband intermediate frequency output (10) are obtained.
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
Device (8), is all connected with radio-frequency plumbing-microstrip line (2) on 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 of generation via intermediate-frequency filter
(8) export, intermediate-frequency filter (8) output terminal 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 two pole of Schottky
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 transmits.
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 formed 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 form, wherein straight-through end and coupled end are as output terminal
Mouthful, and there are 90 ° of phase difference for 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 surface waves
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 formed 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 divides port to be triangular wedge structure, and the length and height of triangular wedge structure can adjust.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276540A (en) * | 2017-08-10 | 2017-10-20 | 四川久成泰安科技有限公司 | A kind of Terahertz image frequency suppresses mixting circuit |
| CN112803897A (en) * | 2020-12-30 | 2021-05-14 | 四川德骏智造科技有限公司 | Terahertz fundamental wave frequency mixing module |
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2017
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276540A (en) * | 2017-08-10 | 2017-10-20 | 四川久成泰安科技有限公司 | A kind of Terahertz image frequency suppresses mixting circuit |
| CN107276540B (en) * | 2017-08-10 | 2023-06-13 | 四川久成泰安科技有限公司 | Terahertz image frequency suppression mixing circuit |
| CN112803897A (en) * | 2020-12-30 | 2021-05-14 | 四川德骏智造科技有限公司 | Terahertz fundamental wave frequency mixing module |
| CN112803897B (en) * | 2020-12-30 | 2022-11-18 | 四川德骏智造科技有限公司 | Terahertz fundamental wave frequency mixing module |
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