CN107395128A - Terahertz frequency mixer - Google Patents
Terahertz frequency mixer Download PDFInfo
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- CN107395128A CN107395128A CN201710557976.2A CN201710557976A CN107395128A CN 107395128 A CN107395128 A CN 107395128A CN 201710557976 A CN201710557976 A CN 201710557976A CN 107395128 A CN107395128 A CN 107395128A
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- waveguide
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- waveguiding structure
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The present invention provides a kind of Terahertz frequency mixer, including：First input end waveguiding structure, the second input waveguiding structure and Terahertz mixting circuit；First input end waveguiding structure includes first standard waveguide；Second input waveguiding structure includes at least one second standard waveguide being sequentially connected and at least one first subtracts high waveguide, and Terahertz mixting circuit includes the first E faces microstrip probe, the 2nd E faces microstrip probe, Xiao Jite diodes, the circuited transmission for exporting mixed frequency signal, the first low pass filter, the second low pass filter.The present invention can either realize the size for reducing first input end waveguiding structure and Terahertz mixting circuit, and to be advantageous to the miniaturization of Terahertz frequency mixer, and can reduces the circuit loss of Terahertz frequency mixer.
Description
Technical field
The invention belongs to THz devices technical field, more particularly to a kind of Terahertz frequency mixer.
Background technology
Electromagnetic wave of the frequency in the range of 0.1-10THz is generally defined as THz wave (THz ripples), it is between millimeter wave
Between infrared light, in the transition region from electronics light to photonic propulsion.THz ripples occupy very special position in electromagnetic spectrum
Put, have the characteristics that frequency it is high, with it is wide, security is good, be widely used in safety check, communication, colleague, radar, radio astronomy.
Because the frequent rate of THz wave is higher, in order to obtain reliable and stable signal source, it is often necessary to realized too using the method for mixing
The change of Hertz wave signal frequency, the process are realized typically by frequency mixer.
Traditional frequency mixer is typically real using the rectangular-wave resonant cavity of high quality factor (Q values) in input and output end
The impedance matching of existing Schottky diode and filter function, but the structure of this rectangular-wave resonant cavity causes the chamber of frequency mixer
Body volume is excessive, is unfavorable for the miniaturization of mixer architecture.
The content of the invention
In view of this, the embodiments of the invention provide a kind of Terahertz frequency mixer, to solve rectangular waveguide in the prior art
Structure make it that the cavity volume of frequency mixer is excessive, the problem of being unfavorable for the miniaturization of mixer architecture.
The first aspect of the embodiment of the present invention provides a kind of Terahertz frequency mixer, including：
First input end waveguiding structure, the second input waveguiding structure and Terahertz mixting circuit；
The first input end waveguiding structure includes first standard waveguide, and first standard waveguide is described first
The final stage waveguide of input waveguiding structure, the end of the final stage waveguide of the first input end waveguiding structure is the first short-circuit face；
The second input waveguiding structure includes at least one second standard waveguide for being sequentially connected and at least one the
One subtracts high waveguide, and it is the second input waveguide junction that one first of described second input waveguiding structure one end, which subtracts high waveguide,
The final stage waveguide of structure, the end of the final stage waveguide of the second input waveguiding structure is the second short-circuit face；
The Terahertz mixting circuit includes the first E faces microstrip probe, the 2nd E faces microstrip probe, Xiao Jite diodes, use
In the circuited transmission of output mixed frequency signal, the first low pass filter, the second low pass filter, the first E faces microstrip probe
One end be connected with the input of first low pass filter, the output end of first low pass filter and the Xiao Jite
One end connection of diode, the other end of the Xiao Jite diodes are connected with the 2nd E faces microstrip probe, the first E
The other end of face microstrip probe is connected with the input of second low pass filter, the output end of second low pass filter
It is connected with the circuited transmission；
What the first E faces microstrip probe was set in the final stage waveguide by the first input end waveguiding structure first opens
Mouth is extended in the first input end waveguiding structure, will be received local oscillation signal and is led to Terahertz mixting circuit；2nd E
The second opening that face microstrip probe is set in the final stage waveguide by the second input waveguiding structure extends to described second
In input waveguiding structure, radiofrequency signal will be received and lead to Terahertz mixting circuit.
Further, the first input end waveguiding structure also include one be connected with first standard waveguide second
Subtract high waveguide, described second subtracts the final stage waveguide that high waveguide is the first input end waveguiding structure.
Further, the length of the final stage waveguide of the first input end waveguiding structure is more than the local oscillation signal frequency
A quarter waveguide wavelength, H face radial axle of first opening positioned at the final stage waveguide of the first input end waveguiding structure
At line and in diameter parallel, the spacing in first opening and the described first short-circuit face for the local oscillation signal frequency four/
One waveguide wavelength；The length of the final stage waveguide of the second input waveguiding structure be more than the radio frequency signal frequency four/
One waveguide wavelength, it is described second opening positioned at the second input waveguiding structure final stage waveguide H faces longitudinal axis at and
In diameter parallel, the spacing in second opening and the described second short-circuit face is a quarter waveguide of the radio frequency signal frequency
Wavelength.
Further, the Terahertz mixting circuit also includes：Input matching circuit；The input of the input matching circuit
End is connected with the output end of first low pass filter；The output end of the input matching circuit and the Xiao Jite diodes
Connection.
Further, the outside of the Terahertz mixting circuit is provided with circuit main cavity.
Further, the 2nd E faces microstrip probe is connected by grounded metal band line with the circuit main cavity.
Further, the Xiao Jite diodes include two diodes of reverse parallel connection.
Further, first low pass filter is 5 ranks or 7 rank height impedance micro-strips
Further, the first input end waveguiding structure and the E of the waveguides at different levels of the second input waveguiding structure
Face overlaps.
Further, the substrate of the Terahertz mixting circuit is Rogers Rogers5880 substrates or quartz base plate.
Existing beneficial effect is the embodiment of the present invention compared with prior art：Terahertz provided in an embodiment of the present invention mixes
Frequency device includes：First input end waveguiding structure, the second input waveguiding structure and Terahertz mixting circuit；First input end waveguide
Structure includes first standard waveguide, and the first standard waveguide is the final stage waveguide of first input end waveguiding structure, and first inputs
The end for holding the final stage waveguide of waveguiding structure is the first short-circuit face；Second input waveguiding structure includes at least one be sequentially connected
Individual second standard waveguide and at least one first subtracts high waveguide, and one first of second input waveguiding structure one end subtracts high waveguide
For the final stage waveguide of the second input waveguiding structure, the end of the final stage waveguide of the second input waveguiding structure is the second short circuit
Face；Terahertz mixting circuit includes the first E faces microstrip probe, the 2nd E faces microstrip probe, Xiao Jite diodes, mixed for exporting
The circuited transmission of frequency signal, the first low pass filter, the second low pass filter, one end and first of the first E faces microstrip probe
The input connection of low pass filter, the output end of the first low pass filter are connected with one end of Xiao Jite diodes, Xiao Jite
The other end of diode is connected with the 2nd E faces microstrip probe, the other end of the first E faces microstrip probe and the second low pass filter
Input is connected, and the output end of the second low pass filter is connected with circuited transmission；First E faces microstrip probe passes through the first input
Hold the set in the final stage waveguide of waveguiding structure first opening to extend in first input end waveguiding structure, local oscillator letter will be received
Number lead to Terahertz mixting circuit；Second set in the final stage waveguide that 2nd E faces microstrip probe passes through output end waveguiding structure
Opening is extended in the second input waveguiding structure, will be received radiofrequency signal and is led to Terahertz mixting circuit.Due to first defeated
Entering to hold waveguiding structure includes a standard waveguide, and Terahertz mixting circuit is using including the first E faces microstrip probe, the 2nd E faces
Microstrip probe, Xiao Jite diodes, the circuited transmission for exporting mixed frequency signal, the first low pass filter, the second low pass filtered
The planar transmission cable architecture of ripple device, it is mutual successively that the second input waveguiding structure using the second standard waveguide with first subtracts high waveguide
The multistage waveguiding structure of connection, the size for reducing first input end waveguiding structure and Terahertz mixting circuit can either be realized, with
Be advantageous to the miniaturization of Terahertz frequency mixer, and can reduces the circuit material loss of Terahertz frequency mixer.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is the structural representation for the Terahertz frequency mixer that one embodiment of the invention provides；
Fig. 2 is the structural representation for the Terahertz frequency mixer that another embodiment of the present invention provides；
Fig. 3 is Schottky diode structure schematic diagram provided in an embodiment of the present invention.
Embodiment
In describing below, in order to illustrate rather than in order to limit, it is proposed that such as tool of particular system structure, technology etc
Body details, thoroughly to understand the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention can also be realized in the other embodiments of details.In other situations, omit to well-known system, device, electricity
Road and the detailed description of method, in case unnecessary details hinders description of the invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
The structural representation of the Terahertz frequency mixer provided with reference to figure 1, Fig. 1 for one embodiment of the invention, the present embodiment
Terahertz frequency mixer include：First input end waveguiding structure 101, the second input waveguiding structure 102 and Terahertz mixing electricity
Road 103.
First input end waveguiding structure 101 includes first standard waveguide 1011, and the first standard waveguide 1011 is first
The final stage waveguide of input waveguiding structure 101, the end of the final stage waveguide of first input end waveguiding structure 101 is the first short circuit
Face.
Second input waveguiding structure 102 includes at least one second standard waveguide 1021 for being sequentially connected and at least one
First subtracts high waveguide 1022, and it is the second input that one first of the one end of the second input waveguiding structure 102, which subtracts high waveguide 1022,
The final stage waveguide of waveguiding structure 102, the end of the final stage waveguide of the second input waveguiding structure 102 is the second short-circuit face.
Terahertz mixting circuit 103 includes the first E faces microstrip probe 1031, the 2nd E faces microstrip probe 1032, Xiao Jite bis-
Pole pipe 1033, the circuited transmission 1034 for exporting mixed frequency signal, the first low pass filter 1035, the second low pass filter
1036, one end of the first E faces microstrip probe 1031 is connected with the input of the first low pass filter 1035, the first low pass filter
1035 output end is connected with one end of Xiao Jite diodes 1033, and the other end of Xiao Jite diodes 1033 and the 2nd E faces are micro-
Band probe 1032 is connected, and the other end of the first E faces microstrip probe 1031 is connected with the input of the second low pass filter 1036, the
The output end of two low pass filters 1036 is connected with circuited transmission 1034.
First set in the final stage waveguide that first E faces microstrip probe 1031 passes through first input end waveguiding structure 101 opens
Mouth 1012 is extended in the structure of first input end waveguide 101, will be received local oscillation signal and is led to Terahertz mixting circuit；2nd E
The second opening 1023 that face microstrip probe 1032 is set in the final stage waveguide by the second input waveguiding structure 102 extends to the
In two input waveguiding structures 102, radiofrequency signal will be received and lead to Terahertz mixting circuit.Wherein, the frequency of local oscillation signal
Can be 110GHz, the frequency of radiofrequency signal can be 221GHz.
It should be noted that：The effect of first low pass filter is to transmit this true signal of reception to Xiao to greatest extent
Base spy's diode, while organize the feedback of radiofrequency signal and other harmonic waves to input and Mid Frequency.Second low pass filter
Only allow the intermediate-freuqncy signal caused by Xiao Jite diodes in each harmonic to pass through.
The operation principle of above-mentioned Terahertz frequency mixer is：First input end waveguiding structure receives local oscillation signal, the first E faces
Microstrip probe obtains local oscillation signal, after the processing of the first low pass filter, transmits to Xiao Jite diodes；Second input ripple
Guide structure receives radiofrequency signal, and the 2nd E faces microstrip probe obtains radiofrequency signal, transmitted to Xiao Jite diodes；The poles of Xiao Jite bis-
Local oscillation signal and radiofrequency signal are carried out Frequency mixing processing by pipe, are produced each harmonic, are transmitted to the second low pass filter, the second low pass
Intermediate-freuqncy signal is obtained after filter process, is transferred out by circuited transmission.
It was found from above-described embodiment, Terahertz frequency mixer provided in an embodiment of the present invention, due to first input end waveguide junction
Structure includes a standard waveguide, and Terahertz mixting circuit is using including the first E faces microstrip probe, the 2nd E faces microstrip probe, Xiao
Base spy diode, the circuited transmission for exporting mixed frequency signal, the first low pass filter, the plane of the second low pass filter pass
Defeated cable architecture, the second input waveguiding structure subtract the multistage ripple that high waveguide interconnects successively using the second standard waveguide and first
Guide structure, the size for reducing first input end waveguiding structure and Terahertz mixting circuit can either be realized, to be advantageous to Terahertz
The miniaturization of frequency mixer, and can reduce the circuit loss of Terahertz frequency mixer.
With reference to figure 2, Fig. 2 is the structural representation for the Terahertz frequency mixer that another embodiment of the present invention provides, above-mentioned
On the basis of embodiment, first input end waveguiding structure 101 also includes：One be connected with the first standard waveguide 1011 second subtract
High waveguide 1013, second subtracts the final stage waveguide that high waveguide 1013 is first input end waveguiding structure 101.Wherein, the first standard ripple
It can be WR-8 rectangular waveguides to lead 1011, and second subtracts high waveguide 1013 subtracts high waveguide for one-level.Subtract high waveguide by setting up one-level
To ensure that local oscillation signal enters first input end waveguiding structure to greatest extent.
Further, it is more than local oscillation signal frequency with reference to figure 2, the length of the final stage waveguide of first input end waveguiding structure 101
The a quarter waveguide wavelength of rate, first opening 1012 positioned at first input end waveguiding structure 101 final stage waveguides H face diameters to
At axis and in diameter parallel, the spacing in the first opening 1012 and the first short-circuit face for local oscillation signal frequency a quarter waveguide
Wavelength.
The length of the final stage waveguide of second input waveguiding structure 102 is more than the quarter-wave guided wave of radio frequency signal frequency
Long, the second opening 1023 is put down at the H faces longitudinal axis of the final stage waveguide of the second input waveguiding structure 102 and in axis
OK, the second opening 1023 and a quarter waveguide wavelength that the spacing in the second short-circuit face is radio frequency signal frequency.Wherein E faces are square
The leptoprosopy of shape waveguide, represents electric field；H faces are the wide face of rectangular waveguide, represent magnetic field.
It is open because the electric field in waveguiding structure at a quarter waveguide wavelength of distance short circuit face is most strong, therefore by first
Spacing with the first short-circuit face is a quarter waveguide wavelength of local oscillation signal frequency, can ensure receive to greatest extent
Local oscillation signal Terahertz mixting circuit is coupled to out of first input end waveguiding structure cavity；Second opening and the second short circuit
The spacing in face is a quarter waveguide wavelength of radio frequency signal frequency, can be ensured radiofrequency signal to greatest extent from Terahertz
Mixting circuit is coupled to Terahertz mixting circuit.
Further, also include with reference to figure 2, Terahertz mixting circuit 103：Input matching circuit 1037, the input
Input with circuit 1037 is connected with the output end of first low pass filter 1035；The input matching circuit 1037
Output end is connected with the Xiao Jite diodes 1033.Effect by input matching circuit be by the impedance of first input end with
The impedance of Xiao Jite diodes is matched.
Further, it is provided with circuit main cavity 104 with reference to figure 2, the outside of the Terahertz mixting circuit.
Further, grounded metal band line 1038 and the electricity are passed through with reference to figure 2, the 2nd E faces microstrip probe 1032
Road main cavity 104 connects.
Further, two diodes of reverse parallel connection are included with reference to figure 3, the Xiao Jite diodes 1033.
Further, first low pass filter is 5 ranks or 7 rank height impedance micro-strips.
Further, with reference to figure 2, the first input end waveguiding structure 101 and the second input waveguiding structure 102
Waveguides at different levels E faces overlap.Wherein input waveguiding structure 101 and the waveguides at different levels of the output end waveguiding structure 102
Central axis can overlap can also be misaligned.
Further, with reference to figure 2, the substrate of the Terahertz mixting circuit is Rogers Rogers5880 substrates or quartz
Substrate, the wherein thickness of the substrate of Rogers 5880 are 127 millimeters, and the thickness of the quartz base plate is 30 millimeters to 75 millimeters.
Formed it should be noted that the transmission line on the substrate of Terahertz mixting circuit is metallic gold Au, thickness range
For 2 microns to 4 microns.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to foregoing reality
Example is applied the present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each
Technical scheme described in embodiment is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed
Or replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme, all should
Within protection scope of the present invention.
Claims (10)
- A kind of 1. Terahertz frequency mixer, it is characterised in that including：First input end waveguiding structure, the second input waveguiding structure With Terahertz mixting circuit；The first input end waveguiding structure includes first standard waveguide, and first standard waveguide is the described first input The final stage waveguide of waveguiding structure is held, the end of the final stage waveguide of the first input end waveguiding structure is the first short-circuit face；At least one second standard waveguide and at least one first that the second input waveguiding structure includes being sequentially connected subtracts High waveguide, one first of described second input waveguiding structure one end subtract high waveguide as the second input waveguiding structure Final stage waveguide, the end of the final stage waveguide of the second input waveguiding structure is the second short-circuit face；The Terahertz mixting circuit include the first E faces microstrip probe, the 2nd E faces microstrip probe, Xiao Jite diodes, for defeated Go out the circuited transmission of mixed frequency signal, the first low pass filter, the second low pass filter, the one of the first E faces microstrip probe End is connected with the input of first low pass filter, the output end of first low pass filter and the poles of Xiao Jite bis- One end connection of pipe, the other end of the Xiao Jite diodes are connected with the 2nd E faces microstrip probe, and the first E faces are micro- The other end with probe is connected with the input of second low pass filter, the output end of second low pass filter and institute State circuited transmission connection；The first opening that the first E faces microstrip probe is set in the final stage waveguide by the first input end waveguiding structure is prolonged Extend in the first input end waveguiding structure, local oscillation signal will be received and lead to Terahertz mixting circuit；The 2nd E faces are micro- The second opening set in final stage waveguide with probe by the second input waveguiding structure extends to second input Hold in waveguiding structure, radiofrequency signal will be received and lead to Terahertz mixting circuit.
- 2. Terahertz frequency mixer according to claim 1, it is characterised in that the first input end waveguiding structure also includes One be connected with first standard waveguide second subtract high waveguide, described second to subtract high waveguide be the first input end waveguide The final stage waveguide of structure.
- 3. Terahertz frequency mixer according to claim 1, it is characterised in that the final stage of the first input end waveguiding structure The length of waveguide is more than a quarter waveguide wavelength of the local oscillation signal frequency, and first opening is positioned at the described first input Hold at the H faces longitudinal axis of the final stage waveguide of waveguiding structure and in diameter parallel, first opening and the described first short-circuit face Spacing be the local oscillation signal frequency a quarter waveguide wavelength；The length of the final stage waveguide of the second input waveguiding structure is more than a quarter waveguide of the radio frequency signal frequency Wavelength, second opening is at the H faces longitudinal axis of the final stage waveguide of the second input waveguiding structure and in axis Parallel, the spacing in second opening and the described second short-circuit face is a quarter waveguide wavelength of the radio frequency signal frequency.
- 4. Terahertz frequency mixer according to claim 1, it is characterised in that the Terahertz mixting circuit also includes：It is defeated Enter match circuit；The input of the input matching circuit is connected with the output end of first low pass filter；The output end of the input matching circuit is connected with the Xiao Jite diodes.
- 5. Terahertz frequency mixer according to claim 1, it is characterised in that the outside of the Terahertz mixting circuit is provided with Circuit main cavity.
- 6. Terahertz frequency mixer according to claim 5, it is characterised in that the 2nd E faces microstrip probe passes through ground connection Metal tape line is connected with the circuit main cavity.
- 7. according to the Terahertz frequency mixer described in claim any one of 1-6, it is characterised in that the Xiao Jite diodes include Two diodes of reverse parallel connection.
- 8. according to the Terahertz frequency mixer described in claim any one of 1-6, it is characterised in that first low pass filter is 5 ranks or 7 rank height impedance micro-strips.
- 9. according to the Terahertz frequency mixer described in claim any one of 1-6, it is characterised in that the first input end waveguide junction Structure overlaps with the E faces of the waveguides at different levels of the second input waveguiding structure.
- 10. according to the Terahertz frequency mixer described in claim any one of 1-6, it is characterised in that the Terahertz mixting circuit Substrate be Rogers Rogers5880 substrates or quartz base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710557976.2A CN107395128A (en) | 2017-07-10 | 2017-07-10 | Terahertz frequency mixer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710557976.2A CN107395128A (en) | 2017-07-10 | 2017-07-10 | Terahertz frequency mixer |
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| CN107395128A true CN107395128A (en) | 2017-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710557976.2A Pending CN107395128A (en) | 2017-07-10 | 2017-07-10 | Terahertz frequency mixer |
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Cited By (2)
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| CN111987997A (en) * | 2020-09-03 | 2020-11-24 | 电子科技大学 | Terahertz frequency mixer without local oscillator filter structure |
| CN113131106A (en) * | 2019-12-31 | 2021-07-16 | 同方威视技术股份有限公司 | Terahertz mixer and electronic component |
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| CN111987997B (en) * | 2020-09-03 | 2022-04-08 | 电子科技大学 | Terahertz frequency mixer without local oscillator filter structure |
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Application publication date: 20171124 |