CN111884597A - Terahertz broadband even harmonic mixing circuit based on distributed radio frequency loop and mixer - Google Patents
Terahertz broadband even harmonic mixing circuit based on distributed radio frequency loop and mixer Download PDFInfo
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Abstract
The utility model provides a terahertz broadband even harmonic mixing circuit and a mixer based on a distributed radio frequency loop, wherein the mixing circuit comprises a radio frequency input probe, an inverse parallel diode pair, a cascade wide stop band high-suppression local oscillation filter, a local oscillation input probe, an intermediate frequency filter and an intermediate frequency output port, and the frequency input probe, the reverse parallel diode pair, the cascade wide stop band high-suppression local oscillation filter, the local oscillation input probe, the intermediate frequency filter and the intermediate frequency output port are sequentially; the radio frequency input probe is grounded, and the near radio frequency input end of the reverse parallel diode pair is grounded to form a distributed multi-radio frequency loop; according to the scheme, the distributed multi-radio-frequency loop is utilized, the influence of the ground loop on the performance such as the bandwidth and the low frequency conversion loss of the terahertz even-order mixer is effectively reduced, the local oscillator harmonic wave is matched by the distributed multi-loop, the influence of the terahertz harmonic wave is reduced, the bandwidth of the mixer is expanded, and the frequency conversion loss of the mixer is reduced.
Description
Technical Field
The disclosure relates to the technical field of even harmonic mixers, in particular to a terahertz broadband even harmonic mixer circuit based on a distributed radio frequency loop and a mixer.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
A broadband mixing detector based on a planar Schottky diode is a core component of a terahertz test instrument, and mainly has the functions of converting a high-frequency terahertz signal into a low-frequency microwave signal and further realizing analysis and processing of the terahertz signal through analysis of the microwave signal; because no commercial low-noise amplifier of the terahertz broadband is over 200GHz, the mixer in the terahertz testing instrument becomes the first stage of a signal receiving front end, and how to realize performance indexes such as low frequency conversion loss, noise temperature and the like under the broadband of the terahertz mixer becomes a key for improving the performance of the terahertz testing instrument.
Disclosure of Invention
In order to solve the above problems, the present disclosure provides a terahertz broadband even harmonic mixing circuit and a mixer based on a distributed radio frequency loop, in which the distributed multiple radio frequency loops are used to effectively reduce the influence of a ground loop on the performance of the terahertz even harmonic mixer, such as bandwidth and low frequency conversion loss, and the distributed multiple loops are used to match the local oscillator harmonic wave, reduce the influence of the local oscillator harmonic wave, expand the bandwidth of the mixer, and reduce the frequency conversion loss of the mixer.
According to a first aspect of the embodiments of the present disclosure, there is provided a terahertz broadband even harmonic mixing circuit based on a distributed radio frequency loop, including: the device comprises a radio frequency input probe, an inverse parallel diode pair, a cascade wide stop band high-suppression local oscillator filter, a local oscillator input probe, an intermediate frequency filter and an intermediate frequency output port, which are sequentially connected and integrated on a micro-strip line;
the radio frequency input probe is grounded, and the near radio frequency input end of the reverse parallel diode pair is grounded to form a distributed multi-radio frequency loop.
Furthermore, the grounding of the parallel diode pair adopts a high-low impedance line structure.
Further, the grounding of the parallel diode pair comprises a first grounding unit and a second grounding unit, and the first grounding unit and the second grounding unit and the radio frequency input probe are grounded to form three radio frequency loops.
Furthermore, the medium frequency filter adopts an I-shaped high Q value resonance structure with expanded capacitive property.
According to a second aspect of the embodiments of the present disclosure, there is provided a terahertz broadband even harmonic mixer based on a distributed radio frequency loop,
the terahertz broadband even harmonic mixer based on the distributed radio frequency loop comprises a radio frequency input waveguide, a local oscillator input waveguide and the terahertz broadband high-efficiency even harmonic mixer circuit.
Compared with the prior art, the beneficial effect of this disclosure is:
(1) the invention adopts the design technology of the distributed multi-radio frequency loop, effectively reduces the influence of the ground loop on the performance such as the bandwidth, the low frequency conversion loss and the like of the terahertz even-order mixer, matches local oscillator harmonic clutter by utilizing the distributed multi-loop, reduces the influence of the terahertz harmonic clutter, expands the bandwidth of the mixer and reduces the frequency conversion loss of the mixer; meanwhile, the problem that the broadband and the high efficiency of the terahertz even harmonic mixer are mutually restricted is effectively solved;
(2) the invention adopts an I-shaped high Q value resonance structure with expanded capacitance, improves the performance of the local oscillation filtering unit, further reduces the influence caused by local oscillation harmonic waves, and improves the performance of the terahertz broadband even harmonic mixer.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic structural diagram of a terahertz broadband high-efficiency even harmonic mixer based on single-point far-end grounding in a first embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a distributed multipoint-ground-based terahertz broadband even harmonic mixer according to a first embodiment of the disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
By analyzing domestic and foreign reference documents and products, the terahertz even harmonic mixer is simple in circuit manufacturing and assembly because a balun structure is not needed, the frequency of a local oscillator can be reduced to 1/N of the adopted harmonic frequency N, the higher the harmonic frequency N is, the lower the required frequency of the local oscillator is, but the higher the frequency conversion loss is, so that the realization of the local oscillator and the frequency conversion performance needs to be comprehensively considered in the selection of N, the most commonly used harmonic frequencies are 2, 4 and 6, the characteristics of realizing the broadband and low frequency conversion loss of the terahertz even harmonic mixer are always the direction of efforts of the terahertz even harmonic mixer, and particularly the research and development of a high-performance terahertz test instrument is particularly important. With the continuous rise of terahertz frequency, the wavelength is continuously reduced, the contradiction between wide bandwidth and low frequency conversion loss is more and more serious, the problem of mutual restriction between high-frequency (more than 500 GHz) wide bandwidth and high efficiency is solved, and the terahertz even harmonic mixer becomes a breakthrough and focus of attention in the technology; the current major technical route is the single rf loop technical route shown in fig. 1.
As shown in fig. 1, a high-efficiency even harmonic mixer structure based on a single-point far-end grounded terahertz broadband in the prior art is shown; the mixer structure mainly comprises 7 parts of circuits, terahertz signals are input through a radio frequency input port 1 and local oscillation signals input through a local oscillation input port 2, down-mixing is carried out at a reverse parallel diode 4, generated intermediate frequency signals are output through a duplexer formed by a local oscillation filter 5 and an intermediate frequency filter 6 through a port 3, a single radio frequency loop is adopted in the whole circuit, the distance of grounding in the loop is far relative to a nonlinear device, matching of harmonic clutter signals of the local oscillation is difficult, meanwhile, the local oscillation filter 5 and the intermediate frequency filter 6 mostly adopt resonance units with high and low impedance lines, the bandwidth and inhibition characteristics are relatively poor, the design requirements of a broadband and high-frequency-conversion characteristic even harmonic mixer are difficult to meet, and particularly, the problem is more prominent along with the increase of application harmonic times.
Therefore, the existing technical route of terahertz even harmonic mixing cannot well integrate broadband and low frequency conversion loss, especially on higher harmonic times such as 4 times and 6 times; aiming at the problem, circuit topology innovation is carried out around the basic principle of the terahertz single-balanced harmonic mixer, the terahertz broadband and high-efficiency even harmonic mixer based on the distributed multi-loop is provided, the influence of a ground loop is reduced by adopting a distributed multi-loop circuit topology form, the local oscillator harmonic clutter is matched by utilizing the technical advantages of the distributed multi-loop, an I-shaped filtering structure loaded by a capacitor is adopted, the bandwidth and the performance of local oscillator and intermediate frequency duplex are improved, and the technical requirements of expanding the bandwidth of the mixer and reducing the frequency conversion loss of the mixer are finally met.
The first embodiment is as follows:
the purpose of this embodiment is to provide a terahertz broadband even harmonic mixing circuit based on distributed radio frequency return circuit.
The terahertz broadband even harmonic mixing circuit based on the distributed radio frequency loop comprises a radio frequency input probe, an inverse parallel diode pair, a cascade wide stop band high-rejection local oscillator filter, a local oscillator input probe, an intermediate frequency filter and an intermediate frequency output port, and is sequentially connected and integrated on a microstrip line;
the radio frequency input probe is grounded, and the near radio frequency input ends of the reverse parallel diode pairs are grounded in a distributed mode to form a distributed multi-radio frequency loop.
Further, the distributed grounding of the parallel diode pair adopts a high-low impedance line structure, and the high-low impedance line structure is 9 and 10 as shown in fig. 2; the distributed grounding of the parallel diode pair comprises a first grounding unit and a second grounding unit, and the first grounding unit and the second grounding unit are grounded with the radio frequency input probe to form three radio frequency loops; the medium-frequency filter adopts an I-shaped high-Q-value resonance structure with expanded capacitance.
Furthermore, the radio frequency input probe and the local oscillator input probe are both coupling probes.
Specifically, the terahertz broadband high-efficiency even harmonic mixing circuit described in this embodiment is described in detail with reference to fig. 2, as shown in fig. 2, 1 is a radio frequency input port of a mixer, 2 is a local oscillator input port, 3 is an intermediate frequency output port, 4 is a frequency conversion device antiparallel diode, 5 is a local oscillator filter, 6 is a local oscillator input probe, 7 is an intermediate frequency filter, 8 is a radio frequency input probe coupling end grounding unit, 9 and 10 are grounding units at antiparallel diodes, and 11 is a radio frequency input probe; the radio frequency signal of the mixer is input through a radio frequency input 1, the radio frequency input port 1 is a waveguide port, the radio frequency signal is coupled to a microstrip transmission line through a waveguide transmission line through a radio frequency coupling probe 11, and the signal is fed to a nonlinear device reverse parallel diode 4; local oscillation signals of the frequency mixer are fed in through a local oscillation input port 2, are coupled to a microstrip transmission line through a local oscillation input probe 6, are fed in to a reverse parallel diode 4 through a local oscillation filtering unit 5, and are subjected to frequency mixing at a nonlinear device 4 through radio frequency signals input through a radio frequency port 1 and local oscillation signals input through a local oscillation port, and intermediate frequency after frequency mixing is performed and is output through a local oscillation filter 5, the local oscillation input probe 6, an intermediate frequency filter and an intermediate frequency output port 3. In the invention, a distributed multi-loop design is provided, in the embodiment, three radio frequency loops are adopted, the three loops have three connection ground structures, 8 is the ground of a radio frequency input probe, 9 and 10 are the near-end grounds of nonlinear devices, 9 and 10 utilize a high-low impedance line structure to realize the matching of local oscillator stray, the requirement of a local oscillator filter 5 is reduced, because the better the filtering performance is, the more the required filtering resonance units are, even to meet the characteristic of broadband filtering, the cascade connection of different filters is needed, so that the loss of local oscillator signals by the local oscillator filter is larger, the requirement of local oscillator power is increased, and the difficulty of generating abnormity of broadband high-power signals in a high frequency band is reduced, therefore, the invention effectively reduces the influence of the ground loops on the performances of bandwidth, low frequency conversion loss and the like of a terahertz even-order mixer through the distributed radio frequency multi-loop structure, and utilizes the distributed multi-loop to match the, the influence of terahertz harmonic waves is reduced, the bandwidth of the frequency mixer is expanded, and the frequency conversion loss of the frequency mixer is reduced. The resonance structure in the local oscillation filtering unit adopts an I-shaped high Q value resonance structure with expanded capacitance, so that the performance of the local oscillation filtering unit is improved, the influence caused by local oscillation harmonic waves is further reduced, and the performance of the terahertz broadband even harmonic mixer is improved.
Example two:
the purpose of this embodiment is to provide a terahertz broadband even harmonic mixer based on distributed radio frequency return circuit.
A terahertz broadband even harmonic mixer based on a distributed radio frequency loop comprises a radio frequency input waveguide, a local oscillator input waveguide and the terahertz broadband even harmonic mixer circuit based on the distributed radio frequency loop.
The terahertz broadband even harmonic mixing circuit and the mixer based on the distributed radio frequency loop can be completely realized, and have wide application prospects.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. Terahertz broadband even harmonic mixing circuit based on distributed radio frequency loop, its characterized in that includes: the device comprises a radio frequency input probe, an inverse parallel diode pair, a cascade wide stop band high-suppression local oscillator filter, a local oscillator input probe, an intermediate frequency filter and an intermediate frequency output port, which are sequentially connected and integrated on a micro-strip line;
the radio frequency input probe is grounded, and the near radio frequency input end of the reverse parallel diode pair is grounded to form a distributed multi-radio frequency loop.
2. The terahertz broadband even harmonic mixing circuit based on the distributed radio frequency loop of claim 1, wherein the parallel diode pair is grounded by a high-low impedance line structure.
3. The distributed rf loop-based terahertz broadband even-harmonic mixing circuit of claim 1, wherein the grounding of the parallel diode pair comprises a first grounding unit and a second grounding unit, and forms three distributed rf loops with the rf input probe grounding.
4. The terahertz broadband even-order harmonic mixing circuit based on the distributed radio frequency circuit as claimed in claim 1, wherein the intermediate frequency filter adopts an i-shaped high-Q resonance structure with expanded capacitance.
5. The distributed rf loop-based terahertz broadband even harmonic mixing circuit of claim 1, wherein the rf input probe is of the type of a coupling probe.
6. The terahertz broadband even-order harmonic mixing circuit based on the distributed radio frequency loop as claimed in claim 1, wherein the type of the local oscillator input probe is a coupling probe.
7. The terahertz broadband even-order harmonic mixing circuit based on the distributed radio frequency loop as claimed in claim 1, wherein the local oscillator filter adopts a cascaded wide stop band high suppression local oscillator filter.
8. The terahertz broadband even harmonic mixer based on the distributed radio frequency loop is characterized in that the mixer adopts the terahertz broadband even harmonic mixer circuit based on the distributed radio frequency loop as claimed in any one of claims 1 to 7.
9. The distributed RF loop based terahertz broadband even harmonic mixer of claim 8,
the mixer includes a radio frequency input waveguide.
10. The distributed RF loop based terahertz broadband even harmonic mixer of claim 8,
the mixer includes a local oscillator input waveguide.
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Cited By (4)
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| CN112688642A (en) * | 2020-12-16 | 2021-04-20 | 杭州电子科技大学 | Millimeter wave broadband mixer based on asymmetric three-wire coupler |
| CN113098401A (en) * | 2021-04-14 | 2021-07-09 | 中国电子科技集团公司第三十八研究所 | Terahertz D-band fourth harmonic mixer |
| WO2022036872A1 (en) * | 2020-08-18 | 2022-02-24 | 中电科仪器仪表有限公司 | Broadband terahertz fourth harmonic mixer circuit, mixer, and method |
| CN114335947A (en) * | 2021-12-21 | 2022-04-12 | 成都天成电科科技有限公司 | Terahertz frequency mixer based on passive broadband structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022036872A1 (en) * | 2020-08-18 | 2022-02-24 | 中电科仪器仪表有限公司 | Broadband terahertz fourth harmonic mixer circuit, mixer, and method |
| CN112688642A (en) * | 2020-12-16 | 2021-04-20 | 杭州电子科技大学 | Millimeter wave broadband mixer based on asymmetric three-wire coupler |
| CN112688642B (en) * | 2020-12-16 | 2024-02-23 | 杭州电子科技大学 | Millimeter wave broadband mixer based on asymmetric three-wire coupler |
| CN113098401A (en) * | 2021-04-14 | 2021-07-09 | 中国电子科技集团公司第三十八研究所 | Terahertz D-band fourth harmonic mixer |
| CN113098401B (en) * | 2021-04-14 | 2022-09-30 | 中国电子科技集团公司第三十八研究所 | Terahertz D-band fourth harmonic mixer |
| CN114335947A (en) * | 2021-12-21 | 2022-04-12 | 成都天成电科科技有限公司 | Terahertz frequency mixer based on passive broadband structure |
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Application publication date: 20201103 |