CN115513631A - Terahertz ultra-wideband radiometer integrated front end - Google Patents
Terahertz ultra-wideband radiometer integrated front end Download PDFInfo
- Publication number
- CN115513631A CN115513631A CN202211149078.0A CN202211149078A CN115513631A CN 115513631 A CN115513631 A CN 115513631A CN 202211149078 A CN202211149078 A CN 202211149078A CN 115513631 A CN115513631 A CN 115513631A
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- Prior art keywords
- terahertz
- radiometer
- wideband
- circuit
- frequency band
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
Abstract
The invention provides a terahertz ultra-wideband radiometer integrated front end, which comprises: the terahertz radiometer comprises an input link, a first frequency band terahertz radiometer circuit, a second frequency band terahertz radiometer circuit, a third frequency band terahertz radiometer circuit, a fourth frequency band terahertz radiometer circuit and a connecting link. In the integrated front end of the terahertz ultra-wideband radiometer, terahertz radiometer circuits of different frequency bands are integrated into a whole module through the integrally formed connecting link, and an external flange is not needed for connection, so that the miniaturization of the front end of the terahertz radar is guaranteed, and the integrated front end of the terahertz ultra-wideband radiometer has the advantages of simple structure and low cost. In addition, the receiving and transmitting framework of the integrated front end of the terahertz ultra-wideband radiometer also meets the requirement of the same source of the radiometers in all frequency bands, and the resolution of a radiometer system can be further improved.
Description
Technical Field
The invention relates to the technical field of radar communication, in particular to an integrated front end of a terahertz ultra-wideband radiometer.
Background
At present, most of existing terahertz circuit modules are single-function modules, and only single functions such as low-noise amplification, frequency mixing and frequency doubling can be realized, and terahertz system circuits are realized by cascading on the basis of the single modules. Each individual module in the design requires one substrate and cavity to carry the circuit, thus requiring multiple substrates and cavities in the overall circuit and requiring connecting waveguides. Such designs are complex to manufacture, costly and have unnecessary internal transmission losses.
The existing terahertz circuit mostly adopts a cascade mode, a low-noise amplifier, a frequency mixer, a local oscillator frequency multiplier and a filter which are required by the front end of a radiometer are connected step by step through waveguide flanges, an output intermediate frequency signal is connected to circuits such as an intermediate frequency amplifier and an intermediate frequency filter through a coaxial line, and the front end circuit is large in size.
Meanwhile, the rectangular waveguide structure is subjected to micro-mechanical milling on pure metal, so that the processing flexibility is poor, and the corner and torsion waveguide structure is very difficult to process, so that the traditional terahertz circuit is mostly a single-layer circuit. The terahertz circuit is small in size and usually in the micron level, but a waveguide flange is of the international standard size, a single circuit flange is about 2 cm, most of the existing terahertz circuits only have one circuit in one cavity, and accordingly the large waste of the internal space is caused, and the large size of the front end of the existing terahertz radiometer is also the main reason.
In addition, the existing ultra-wideband radiometer forms a single-frequency-band radiometer by simply cascading a low-noise amplifier, a subharmonic mixer, a frequency multiplier, a local oscillator driving circuit and the like of each frequency band, and then the radiometers of different frequency bands are placed side by side, so that the ultra-wideband radiometer is realized, the size is large, the loss is high, the sensitivity performance of the radiometer is influenced, and the practical application of the ultra-wideband radiometer is not facilitated.
Therefore, it is necessary to provide a further solution to the above problems.
Disclosure of Invention
The invention aims to provide a terahertz ultra-wideband radiometer integrated front end to overcome the defects in the prior art.
In order to achieve the above object, the present invention provides an integrated front end of a terahertz ultra-wideband radiometer, which includes: the device comprises an input link, a first frequency band terahertz radiometer circuit, a second frequency band terahertz radiometer circuit, a third frequency band terahertz radiometer circuit, a fourth frequency band terahertz radiometer circuit and a connecting link;
the connection link prints integrated into one piece through 3D, and it includes: the waveguide coupler comprises a first branch waveguide directional coupler, a first waveguide structure, a second branch waveguide directional coupler, a second waveguide structure, a third waveguide structure and a power divider;
the two first branch waveguide directional couplers arranged side by side are integrally connected with the power divider through the first waveguide structure, and the two second branch waveguide directional couplers arranged side by side are integrally connected with the power divider through the second waveguide structure;
the first frequency band terahertz radiometer circuit is in integrated connection with one path of first branch waveguide directional coupler, the second frequency band terahertz radiometer circuit is in integrated connection with the other path of first branch waveguide directional coupler, the third frequency band terahertz radiometer circuit is in integrated connection with one path of second branch waveguide directional coupler, and the fourth frequency band terahertz radiometer circuit is in integrated connection with the other path of second branch waveguide directional coupler; the input link is integrally connected with the third waveguide structure;
the frequency bands of the first frequency band terahertz radiometer circuit, the second frequency band terahertz radiometer circuit, the third frequency band terahertz radiometer circuit and the fourth frequency band terahertz radiometer circuit are sequentially increased.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer, the power divider is extended along the + Y direction, the first waveguide structure is connected to one side of the power divider along the + X direction, the second waveguide structure is connected to the other side of the power divider along the-X direction, and the third waveguide structure is connected to one end of the power divider along the-Y direction.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer of the present invention, the first waveguide structure and the second waveguide structure each include: a first portion, a second portion, and a third portion;
the first portion extends from the corresponding side of the power divider along the X direction, the second portion extends from one end of the first portion along the + Y direction, the third portion extends from one end of the second portion along the + Z direction, and the first portion, the second portion and the third portion are connected through an arc-shaped structure.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer, the two first branch waveguide directional couplers extend side by side in the + Z direction and are integrally connected to the end part of the third part in the first waveguide structure; the two paths of second branch waveguide directional couplers extend side by side along the + Z direction and are integrally connected to the end part of the third part in the second waveguide structure.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer of the present invention, the third waveguide structure includes: a fourth section and a fifth section;
the fourth portion extends from one end of the power divider along the-Y direction, the fifth portion extends from one end of the fourth portion along the + Z direction, and the fourth portion and the fifth portion are connected through an arc-shaped structure.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer, the input link comprises the following components in sequence: a Ka frequency band frequency multiplier, a V-band broadband frequency multiplier and a V-band broadband amplifier.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer, the first frequency band terahertz radiometer circuit comprises the following components in sequence: a first bandwidth antenna and a first subharmonic mixer.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer, the second frequency band terahertz radiometer circuit comprises the following components in sequence: a second bandwidth antenna, a second sub-harmonic mixer and a first W-band frequency multiplier.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer, the third-band terahertz radiometer circuit comprises the following components in sequence: the first band-width antenna, the second harmonic mixer, the first terahertz frequency multiplier and the second W-band frequency multiplier are connected in series.
As an improvement of the integrated front end of the terahertz ultra-wideband radiometer, the fourth frequency band terahertz radiometer circuit comprises the following components in sequence: the second band-width antenna comprises a fourth bandwidth antenna, a fourth harmonic mixer, a second terahertz frequency multiplier and a third W-band frequency multiplier.
Compared with the prior art, the invention has the beneficial effects that: in the integrated front end of the terahertz ultra-wideband radiometer, terahertz radiometer circuits of different frequency bands are integrated into a whole module through the integrally formed connecting link, and an external flange is not needed for connection, so that the miniaturization of the front end of the terahertz radar is guaranteed, and the integrated front end of the terahertz ultra-wideband radiometer has the advantages of simple structure and low cost. In addition, the receiving and transmitting framework of the integrated front end of the terahertz ultra-wideband radiometer also meets the requirement of the same source of the radiometers in all frequency bands, and the resolution of a radiometer system can be further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic perspective view of an integrated front end of a terahertz ultra-wideband radiometer according to an embodiment of the present invention;
fig. 2 is a perspective enlarged schematic view of the connection link in fig. 1.
Detailed Description
The present invention is described in detail with reference to the embodiments, but it should be understood that these embodiments are not intended to limit the present invention, and that the functional equivalents and the structural equivalents thereof, which are equivalent to those of ordinary skill in the art, may be modified or substituted by those of ordinary skill in the art.
As shown in fig. 1 and 2, an embodiment of the present invention provides a terahertz ultra-wideband radiometer integrated front end, which includes: the terahertz radiometer comprises an input link 10, a first frequency band terahertz radiometer circuit 20, a second frequency band terahertz radiometer circuit 30, a third frequency band terahertz radiometer circuit 40, a fourth frequency band terahertz radiometer circuit 50 and a connecting link 60.
The connection link 60 is used for realizing integrated connection of the first, second, third and fourth frequency band terahertz radiometer circuits 20 to 50. So, through connecting link 60 with the terahertz radiometer circuit integration of different frequency channels a holistic module, do not need outside flange to connect to terahertz radar front end's miniaturization has been guaranteed. In one embodiment, all circuits are integrated in the same cavity, the horn antenna is also integrated in the cavity and is not connected through an external flange, the size of the whole circuit is 40mm 30mm 20mm, and the size of a traditional cascade system can be reduced by more than 10 times, so that the miniaturization of the front end of the terahertz radiometer is guaranteed.
The connecting link 60 is integrally formed by 3D printing, and compared with the prior art, the rectangular waveguide structure is formed by micro-mechanical milling on pure metal, so that the problems of poor processing flexibility and difficulty in processing corner and torsion waveguide structures are caused. The 3D printing can realize the characteristics of abundant structure and printable various twisted waveguide structures, and the high-isolation power divider, the turning waveguide structure and the branch waveguide directional coupler can longitudinally perform one-to-four transmission.
In order to facilitate integration of terahertz radiometer circuits of different frequency bands into a whole module, the connection link 60 of the present embodiment includes: a first branch waveguide directional coupler 61, a first waveguide structure 62, a second branch waveguide directional coupler 63, a second waveguide structure 64, a third waveguide structure 65, and a power divider 66.
The power divider 66 extends along the + Y direction, the first waveguide structure 62 is connected to one side of the power divider 66 along the + X direction, the second waveguide structure 64 is connected to the other side of the power divider 66 along the-X direction, and the third waveguide structure 65 is connected to one end of the power divider 66 along the-Y direction. At this time, two first branch waveguide directional couplers 61 arranged side by side are integrally connected with the power divider 66 through the first waveguide structure 62, and two second branch waveguide directional couplers 63 arranged side by side are integrally connected with the power divider 66 through the second waveguide structure 64.
The third frequency band terahertz radiometer circuit 40 is integrally connected with one path of the second branch waveguide directional coupler 63, and the fourth frequency band terahertz radiometer circuit 50 is integrally connected with the other path of the second branch waveguide directional coupler 63; the input link 10 is integrally connected to a third waveguide structure 65.
In one embodiment, the first and second waveguide structures 62 and 64 each include: a first portion 621, a second portion 622, and a third portion 623. The corresponding side of the first portion 621 power divider 66 extends along the X direction, the second portion 622 extends along the + Y direction from one end of the first portion 621, the third portion 623 extends along the + Z direction from one end of the second portion 622, and the first portion 621, the second portion 622, and the third portion 623 are connected by an arc structure.
At this time, the two first branch waveguide directional couplers 61 extend side by side in the + Z direction and are integrally connected to the end of the third portion 623 of the first waveguide structure 62; the two second branch waveguide directional couplers 63 extend side by side in the + Z direction and are integrally connected to the end of the third portion 623 of the second waveguide structure 64. The first frequency band terahertz radiometer circuit 20 is integrally connected with one path of the first branch waveguide directional coupler 61, and the second frequency band terahertz radiometer circuit 30 is integrally connected with the other path of the first branch waveguide directional coupler 61.
In one embodiment, the third waveguide structure 65 includes: a fourth portion 651 and a fifth portion 652. One end of the fourth portion 651 of the power divider 66 extends along the-Y direction, the fifth portion 652 extends along the + Z direction from one end of the fourth portion 651, and the fourth portion 651 and the fifth portion 652 are connected by an arc structure. At this time, the input link 10 is integrally connected with the end of the fifth part 652.
The input link 10 is used for inputting signals of a local oscillator drive frequency band, and is integrally connected with the power divider 66 through a third waveguide structure 65. Specifically, the input link 10 includes, arranged in sequence along the input direction: a Ka-band frequency multiplier amplifier 11, a V-band broadband frequency multiplier 12 and a V-band broadband amplifier 13. In this way, a driving signal generated by a frequency source is multiplied and amplified to a local oscillator driving frequency band (e.g., 110 GHz). Therefore, the requirement of the same source of the radiometer in each frequency band is also met, and the resolution of the radiometer system can be further improved.
The frequency ranges of the first frequency range terahertz radiometer circuit, the second frequency range terahertz radiometer circuit, the third frequency range terahertz radiometer circuit and the fourth frequency range terahertz radiometer circuit are sequentially increased, and therefore the ultra-wide terahertz frequency range is covered. In one embodiment, the frequency bands of the first, second, third, and fourth frequency band terahertz radiometer circuits 50 are, in order: 110 to 170GHz, 170 to 260GHz,240 to 400GHz,400 to 520GHz. Therefore, the front end of the 110 to 520GHz ultra-wideband radiometer is formed through terahertz radiometer circuits of different frequency bands.
Specifically, the first-frequency-band terahertz radiometer circuit 20 includes, sequentially arranged: a first bandwidth antenna 21 and a first subharmonic mixer 22; the second frequency band terahertz radiometer circuit 30 includes: a second bandwidth antenna 31, a second subharmonic mixer 32 and a first W-band frequency multiplier 33; the third-band terahertz radiometer circuit 40 includes: a third bandwidth antenna 41, a third harmonic mixer 42, a first terahertz frequency multiplier 43, and a second W-band frequency multiplier 44; the fourth-frequency-band terahertz radiometer circuit 50 includes: a fourth bandwidth antenna 51, a fourth harmonic mixer 52, a second terahertz frequency multiplier 53, and a third W-band frequency multiplier 54.
In summary, in the integrated front end of the terahertz ultra-wideband radiometer, the terahertz radiometer circuits of different frequency bands are integrated into a whole module through the integrally formed connecting link, and no external flange is required for connection, so that the miniaturization of the front end of the terahertz radar is ensured, and the integrated front end of the terahertz ultra-wideband radiometer has the advantages of simple structure and low cost. In addition, the receiving and transmitting framework of the integrated front end of the terahertz ultra-wideband radiometer also meets the requirement of the same source of the radiometers in all frequency bands, and the resolution of a radiometer system can be further improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (10)
1. The utility model provides a terahertz ultra wide band radiometer integrated front end which characterized in that, terahertz ultra wide band radiometer integrated front end includes: the device comprises an input link, a first frequency band terahertz radiometer circuit, a second frequency band terahertz radiometer circuit, a third frequency band terahertz radiometer circuit, a fourth frequency band terahertz radiometer circuit and a connecting link;
the connection link is printed integrated into one piece through 3D, and it includes: the device comprises a first branch waveguide directional coupler, a first waveguide structure, a second branch waveguide directional coupler, a second waveguide structure, a third waveguide structure and a power divider;
the two first branch waveguide directional couplers arranged side by side are integrally connected with the power divider through the first waveguide structure, and the two second branch waveguide directional couplers arranged side by side are integrally connected with the power divider through the second waveguide structure;
the first frequency band terahertz radiometer circuit is in integrated connection with one path of first branch waveguide directional coupler, the second frequency band terahertz radiometer circuit is in integrated connection with the other path of first branch waveguide directional coupler, the third frequency band terahertz radiometer circuit is in integrated connection with one path of second branch waveguide directional coupler, and the fourth frequency band terahertz radiometer circuit is in integrated connection with the other path of second branch waveguide directional coupler; the input link is integrally connected with the third waveguide structure;
the frequency bands of the first frequency band terahertz radiometer circuit, the second frequency band terahertz radiometer circuit, the third frequency band terahertz radiometer circuit and the fourth frequency band terahertz radiometer circuit are sequentially increased.
2. The integrated front end of the terahertz ultra-wideband radiometer according to claim 1, wherein the power divider is extended along a + Y direction, the first waveguide structure is connected to one side of the power divider along a + X direction, the second waveguide structure is connected to the other side of the power divider along a-X direction, and the third waveguide structure is connected to one end of the power divider along a-Y direction.
3. The terahertz ultra-wideband radiometer integrated front-end of claim 2, wherein the first waveguide structure and the second waveguide structure each comprise: a first portion, a second portion, and a third portion;
the first portion extends from the corresponding side of the power divider along the X direction, the second portion extends from one end of the first portion along the + Y direction, the third portion extends from one end of the second portion along the + Z direction, and the first portion, the second portion and the third portion are connected through an arc-shaped structure.
4. The integrated front end of the terahertz ultra-wideband radiometer according to claim 3, wherein the two first branch waveguide directional couplers are arranged in a side-by-side extending manner along the + Z direction and are integrally connected to an end of the third portion in the first waveguide structure; the two paths of second branch waveguide directional couplers extend side by side along the + Z direction and are integrally connected to the end part of the third part in the second waveguide structure.
5. The terahertz ultra-wideband radiometer integrated front-end of claim 2 or 3, wherein the third waveguide structure comprises: a fourth section and a fifth section;
the fourth portion extends from one end of the power divider along the-Y direction, the fifth portion extends from one end of the fourth portion along the + Z direction, and the fourth portion and the fifth portion are connected through an arc-shaped structure.
6. The integrated front-end of the terahertz ultra-wideband radiometer according to claim 1, characterized in that the input link comprises, in order: a Ka frequency band frequency multiplier, a V-band broadband frequency multiplier and a V-band broadband amplifier.
7. The integrated front end of the terahertz ultra-wideband radiometer of claim 1, wherein the first band terahertz radiometer circuit comprises, in order: a first bandwidth antenna and a first subharmonic mixer.
8. The integrated front end of the terahertz ultra-wideband radiometer of claim 1, wherein the second band terahertz radiometer circuit comprises, in order: a second bandwidth antenna, a second sub-harmonic mixer and a first W-band frequency multiplier.
9. The integrated front end of the terahertz ultra-wideband radiometer of claim 1, wherein the third band terahertz radiometer circuit comprises, in order: the first terahertz frequency multiplier comprises a first bandwidth antenna, a first third harmonic mixer, a first terahertz frequency multiplier and a second W-band frequency multiplier.
10. The integrated front end of the terahertz ultra-wideband radiometer of claim 1, wherein the fourth band terahertz radiometer circuit comprises sequentially arranged: the second band-width antenna comprises a fourth bandwidth antenna, a fourth harmonic mixer, a second terahertz frequency multiplier and a third W-band frequency multiplier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211149078.0A CN115513631A (en) | 2022-09-21 | 2022-09-21 | Terahertz ultra-wideband radiometer integrated front end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211149078.0A CN115513631A (en) | 2022-09-21 | 2022-09-21 | Terahertz ultra-wideband radiometer integrated front end |
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| Publication Number | Publication Date |
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| CN115513631A true CN115513631A (en) | 2022-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211149078.0A Withdrawn CN115513631A (en) | 2022-09-21 | 2022-09-21 | Terahertz ultra-wideband radiometer integrated front end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548619A (en) * | 2022-12-01 | 2022-12-30 | 四川太赫兹通信有限公司 | Terahertz four-way power divider and ultra-wideband radiation source |
-
2022
- 2022-09-21 CN CN202211149078.0A patent/CN115513631A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548619A (en) * | 2022-12-01 | 2022-12-30 | 四川太赫兹通信有限公司 | Terahertz four-way power divider and ultra-wideband radiation source |
| CN115548619B (en) * | 2022-12-01 | 2023-03-10 | 四川太赫兹通信有限公司 | Terahertz four-way power divider and ultra-wideband radiation source |
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