CN103311631B - A kind of low-temperature directional coupler - Google Patents
A kind of low-temperature directional coupler Download PDFInfo
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- CN103311631B CN103311631B CN201310173048.8A CN201310173048A CN103311631B CN 103311631 B CN103311631 B CN 103311631B CN 201310173048 A CN201310173048 A CN 201310173048A CN 103311631 B CN103311631 B CN 103311631B
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Abstract
A kind of low-temperature directional coupler, comprising: microstrip line, dielectric-slab, underlying metal and via; Microstrip line is printed on the upper surface of dielectric-slab, and underlying metal is plated on dielectric-slab lower surface on covering, and via gets through dielectric-slab, and the corresponding part of the microstrip line of upper surface is connected with lower surface underlying metal; Described microstrip line comprises direct-through line, coupling line, joint pad; Described joint pad is positioned at four port both sides, and the position below joint pad is equipped with via, joint pad is entered with underlying metal and fully contacts.The present invention has and close parameter attribute under room temperature environment under the pole low temperature environment of liquid nitrogen temperature, and has less size, may be used for the refrigeration plants such as dilution refrigeration machine; There is larger bandwidth of operation simultaneously, in radio-frequency range, there is the wider scope of application.
Description
Technical field
The present invention relates to a kind of low-temperature directional coupler be applicable under the cryogenic conditions of pole, belong to radio circuit technical field.
Background technology
Directional coupler is a kind of common microwave device, is in general the directive four port passive devices of tool.Desirable directional coupler is four port networks of a lossless reciprocity, is generally to be made up of main line and by-pass two groups of transmission lines intercoupled.In the transmitting procedure of signal, due to main line (direct-through line) and by-pass (coupling line) intercouple, can by the coupling power that transmits in main line to by-pass, and power is propagated in by-pass there is directionality, the power namely in by-pass is only propagated to a direction.Another direction does not export.The effect of directional coupler is distributed according to certain power proportions relation by input signal, it is widely used in the middle of various microwave circuit, power divider can be used as, for the isolation of signal, separation and mixing, also can be used for measuring the reflection coefficient of components and parts or transmission system, can also be used for monitoring power, frequency and frequency spectrum etc.Along with the development of radio-frequency technique, microwave circuit is applied to every field widely, and this also just requires that microwave circuit works in the middle of different particular surroundingss.Requirement use in the middle of circuit can be applicable to the directional coupler under the low temperature environment of pole.General directional coupler varies with temperature due to its coupling parameter, and the reason such as dimensions is excessive, is not suitable for working in the middle of the circuit under the low temperature environment of pole.
Summary of the invention
The technology of the present invention is dealt with problems: what deficiency overcoming prior art, a kind of directional coupler be applicable under the low temperature environment of pole is provided, it is at liquid nitrogen temperature (i.e. thermodynamic temperature 77K, Celsius temperature-196 DEG C) pole low temperature environment under have and close parameter attribute under room temperature environment, and there is less size, may be used for the refrigeration plants such as dilution refrigeration machine.There is larger bandwidth of operation simultaneously, in radio-frequency range, there is the wider scope of application.
The technology of the present invention solution is as follows: a kind of low-temperature directional coupler, comprising: microstrip line 1, dielectric-slab 2, underlying metal 3 and via 4; Microstrip line 1 is printed on the upper surface of dielectric-slab 2, and underlying metal 3 is plated on dielectric-slab 2 lower surface, via on covering) get through dielectric-slab 2, the corresponding part of the microstrip line 1 of upper surface is connected with lower surface underlying metal 3; Described microstrip line 1 comprises direct-through line 5, coupling line 6, joint pad 7; Described joint pad 7 is positioned at four port both sides, position below joint pad 7 is equipped with via 4, joint pad 7 is entered with underlying metal 3 fully contact, direct-through line 5 and coupling line 6 have input and port a and coupled section and port c to prolong to draw perpendicular to dielectric-slab edge direction respectively, parallel coupling is started at the two place close to each other, be divided into seven sections of parallel wires, five sections of semi arch parallel lines and one section of uneven semi arch two-wire from top to bottom, draw direct-through line 5 and coupling line 6 is connected to first paragraph parallel wire; Connect first paragraph semi arch afterwards, angle of revolution is 180 degree, and arc section is completely parallel; Connect second segment parallel wire afterwards, then connect second segment semi arch, 180 degree, angle of revolution, arc section is completely parallel; Connect the 3rd section of parallel wire afterwards, then connect the 3rd section of semi arch, angle of revolution is 180 degree, and arc section is completely parallel; Connect the 4th section of parallel wire afterwards, then connect the 4th section of semi arch, angle of revolution is 180 degree, and the inside and outside arc radius of adjustment makes it at arc section two-wire not at keeping parallelism, and makes it spacing increase between rear parallel wire; Connect the 5th section of parallel wire afterwards, then connect the 5th section of semi arch, 180 degree, angle of revolution, arc section is completely parallel; Connect the 6th section of parallel wire afterwards, then connect the 6th section of semi arch, angle of revolution is 180 degree, and arc section is completely parallel; Connect the 7th section of parallel wire afterwards, direct-through line 5 and coupling line 6 are connected to straight-through end and port b and isolation end and port d respectively again, joint pad 7 is according to sub-miniature A connector specifications design, the grounding shell of sub-miniature A connector fully contacts with joint pad 7 and underlying metal 3, become earth connection, the holding wire of sub-miniature A connector fully contacts with direct-through line 5 or coupling line 6, becomes holding wire.
In the present invention, dielectric board material selects Rogers RT6010 sheet material, thickness 0.5-1mm, and its dielectric constant does not reduce with temperature and changes, and normally can work, thus ensure that directional coupler has stable low temperature attribute through experimental verification under the low temperature environment of pole.Upper epidermis microstrip line and underlying metal are metallic copper, and thickness is 15-40mil; Described microstrip line uses graphic-print, and be coated with metallic copper, thickness is 15-40mil.
The present invention is compared to the major advantage of prior art:
(1) use parallel microstrip lines structure, and select suitable medium substrate, make its dielectric constant not reduce with temperature and change.The low-temperature characteristics of medium substrate parameter ensure that directional coupler has stable low-temperature characteristics, can't change parameter attribute because of low temperature environment, so go for pole low temperature environment.
(2) by the winding foldable structure of parallel microstrip line, reduce the length needed for device, make device have reduced size, may be used for the refrigeration plants such as existing dilution refrigeration machine, ensure that its availability in cryogenic circuit.
(3) done the mode of circular arc line adjustment radius by parallel wire, change two-wire spacing, thus enable coupler be applicable to wider frequency bandwidth.Utilized bandwidth of the present invention can reach 150MHz-550MHz, and relative bandwidth reaches 114%, has wider use value.
Accompanying drawing explanation
Fig. 1 is structure of the present invention composition schematic diagram;
Fig. 2 is upper surface microstrip line schematic diagram in the present invention;
Fig. 3 is the degree of coupling actual measurement Parameter Map in the present invention;
Fig. 4 is the isolation actual measurement Parameter Map in the present invention.
Embodiment
As shown in Figure 1, the present invention includes: microstrip line 1, dielectric-slab 2, underlying metal 3 and via 4; Microstrip line 1 is printed on the upper surface of dielectric-slab 2, and underlying metal 3 is plated on dielectric-slab lower surface on covering, and via 4 gets through dielectric-slab, and the corresponding part of upper surface microstrip line 1 is connected with lower surface underlying metal 3.Wherein Rogers RT6010 sheet material selected by dielectric-slab 2, and thickness 0.5-1mm, the embodiment of the present invention chooses 0.635mm.Underlying metal 3 is coated with metallic copper for cover type, and thickness is 15-40mil, and the embodiment of the present invention chooses 18mil.Via 4 is for getting through the upper lower through-hole of dielectric-slab, and its effect upper surface microstrip line is punched be in underlying metal conducting.Upper surface microstrip line uses graphic-print, and be coated with metallic copper, thickness is 15-40mil, and the embodiment of the present invention chooses 18mil.
As shown in Figure 2, wherein upper surface microstrip line 1 comprises: direct-through line 5, coupling line 6, joint pad 7; Direct-through line 5 and coupling line 6 are parallel to each other at main body coupling unit, separately become four ports in edge.Joint pad 7 is positioned at four port both sides, and the position of joint pad upper and lower is equipped with via 4, joint pad is entered with bottom and fully contacts.Wherein direct-through line 5 and coupling line 6 parallel coupling, folding to save space through six times.Be divided into seven sections of parallel wires, five sections of semi arch parallel lines and one section of uneven semi arch two-wire from top to bottom, omnidistance two-wire width is 0.4-0.5mm, and the embodiment of the present invention is 0.45mm.Direct-through line and coupling line have input respectively, and (port a) is drawn with coupled section (port c), is connected to first paragraph parallel wire; First paragraph parallel wire line length 16-18mm, the embodiment of the present invention is 17.1mm, two-wire spacing 0.3-0.4mm, and the embodiment of the present invention is 0.35mm; Connect first paragraph semi arch afterwards, angle of revolution is 180 degree, and direct-through line revolution outer radius is 1.4-1.8mm, and the embodiment of the present invention is 1.6mm, and coupling line revolution outer radius is 0.7-0.9mm, and the embodiment of the present invention is 0.8mm; Arc section is completely parallel, and two-wire spacing is 0.3-0.4mm, and the embodiment of the present invention is 0.35mm; Connect second segment parallel wire afterwards, line length 17-19mm, the embodiment of the present invention is 18mm; Doublet interval 0.3-0.4mm, the embodiment of the present invention is 0.35mm; Connect second segment semi arch afterwards, 180 degree, angle of revolution, direct-through line revolution outer radius 0.7-0.9mm, the embodiment of the present invention is 0.8mm; Coupling line revolution outer radius 1.4-1.8mm, the embodiment of the present invention is 1.6mm; Arc section is completely parallel, and two-wire spacing is 0.3-0.4mm, and the embodiment of the present invention is 0.35mm; Connect the 3rd section of parallel wire afterwards, line length 17-19mm, the embodiment of the present invention is 18mm; Two-wire spacing 0.3-0.4mm, the embodiment of the present invention is 0.35mm; Connect the 3rd section of semi arch afterwards, angle of revolution is 180 degree, direct-through line revolution outer radius is 1.4-1.8mm, the embodiment of the present invention is 1.6mm, coupling line revolution outer radius is 0.7-0.9mm, and the embodiment of the present invention is 0.8mm, and arc section is completely parallel, two-wire spacing is 0.3-0.4mm, and the embodiment of the present invention is 0.35mm; Connect the 4th section of parallel wire afterwards, line length 17-19mm, the embodiment of the present invention is 18mm; Two-wire spacing 0.3-0.4mm, the embodiment of the present invention is 0.35mm; Connect the 4th section of semi arch afterwards, angle of revolution is 180 degree, and direct-through line revolution outer radius is 0.7-0.9mm, and the embodiment of the present invention is 0.8mm; Coupling line revolution outer radius is 1.7-2.2mm, and the embodiment of the present invention is 1.95mm; Arc section two-wire is not at keeping parallelism, and spacing is from 0.3-0.4mm, and the embodiment of the present invention is that 0.35mm is increased to 0.9-1.2mm, and the embodiment of the present invention is 1.05mm; Connect the 5th section of parallel wire afterwards, line length 20-22mm, the embodiment of the present invention is 21mm; Two-wire spacing 0.9-1.2mm, the embodiment of the present invention is 1.05mm; Connect the 5th section of semi arch afterwards, 180 degree, angle of revolution, direct-through line revolution outer radius 2-2.6mm, the embodiment of the present invention is 2.3mm; Coupling line revolution outer radius 0.7-0.9mm, the embodiment of the present invention is 0.8mm; Arc section is completely parallel, and two-wire spacing is 0.9-1.2mm, and the embodiment of the present invention is 1.05mm; Connect the 6th section of parallel wire afterwards, line length 20-22mm, the embodiment of the present invention is 21mm two-wire spacing 0.9-1.2mm, and the embodiment of the present invention is 1.05mm; Connect the 6th section of semi arch afterwards, angle of revolution is 180 degree, and direct-through line revolution outer radius is 0.7-0.9mm, and the embodiment of the present invention is 0.8mm; Coupling line revolution outer radius is 2-2.6mm, and the embodiment of the present invention is 2.3mm; Arc section is completely parallel, and two-wire spacing is 0.9-1.2mm, and the embodiment of the present invention is 1.05mm; Connect the 7th section of parallel wire afterwards, line length 19-21mm, the embodiment of the present invention is 20.1mm; Two-wire spacing 0.9-1.2mm, the embodiment of the present invention is 1.05mm; Direct-through line and coupling line are connected to respectively to lead directly to and hold (port b) and isolation end (port d) afterwards.Joint pad specification is according to sub-miniature A connector specifications design, and user welds sub-miniature A connector, to be connected with other elements in circuit.The grounding shell of sub-miniature A connector fully contacts with joint pad 7 and underlying metal 3, becomes earth connection, and the holding wire of sub-miniature A connector fully contacts with direct-through line or coupling line, becomes holding wire.
In four ports, port a is directional coupler input, and port b is straight-through end, and port c is coupled end, and port d is isolation end.Through actual measurement, under directional coupler low temperature, degree of coupling parameter is see Fig. 3, and in the frequency range of 150MHz-550MHz, the degree of coupling is stabilized in-15.5dB-17.5dB scope, and in working frequency range, the coupling output of coupled end has good stability.
Isolation parameter is see Fig. 4, and at 150MHz-550MHz wave band, isolation is all less than-30dB, and isolation end has good isolation, and signal can not export from distance piece.
The present invention meets coupler design and instructions for use completely in the frequency range of working frequency range 150MHz-550MHz, and bandwidth is 400MHz, and centre frequency is 350MHz, and relative bandwidth reaches 114%.Record under degree of coupling parameter and isolation parameter are pole low temperature environment, stable under the low temperature environment of liquid nitrogen temperature (i.e. thermodynamic temperature 77K, Celsius temperature-196 DEG C) use can be ensured.
Non-elaborated part of the present invention belongs to techniques well known.
The above; be only part embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those skilled in the art are in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (2)
1. a low-temperature directional coupler, it is characterized in that: described low-temperature directional coupler can at thermodynamic temperature 77K, stable use under the low temperature environment of Celsius temperature-196 DEG C, it comprises: microstrip line (1), dielectric-slab (2), underlying metal (3) and via (4), microstrip line (1) is printed on the upper surface of dielectric-slab (2), underlying metal (3) is covered in dielectric-slab (2) lower surface, via (4) gets through dielectric-slab (2), and the corresponding part of the microstrip line of upper surface (1) is connected with lower surface underlying metal (3), described microstrip line (1) comprises direct-through line (5), coupling line (6), joint pad (7), described joint pad (7) is positioned at four port both sides, the position of joint pad (7) below is equipped with via (4), joint pad (7) is fully contacted with underlying metal (3), direct-through line (5) is prolonged by port a and input draws perpendicular to dielectric-slab edge direction, coupling line (6) is also prolonged by port c and coupled end draws perpendicular to dielectric-slab edge direction, parallel coupling is started at the two place close to each other, be divided into seven sections of parallel wires from top to bottom, five sections of semi arch parallel lines and one section of uneven semi arch two-wire, draw direct-through line (5) and coupling line (6) is connected to first paragraph parallel wire, connect first paragraph semi arch afterwards, angle of revolution is 180 degree, and arc section is completely parallel, connect second segment parallel wire afterwards, then connect second segment semi arch, 180 degree, angle of revolution, arc section is completely parallel, connect the 3rd section of parallel wire afterwards, then connect the 3rd section of semi arch, angle of revolution is 180 degree, and arc section is completely parallel, connect the 4th section of parallel wire afterwards, then connect the 4th section of semi arch, angle of revolution is 180 degree, and the inside and outside arc radius of adjustment makes it at this arc section two-wire no longer keeping parallelism, and makes it spacing increase between rear parallel wire, connect the 5th section of parallel wire afterwards, then connect the 5th section of semi arch, 180 degree, angle of revolution, arc section is completely parallel, connect the 6th section of parallel wire afterwards, then connect the 6th section of semi arch, angle of revolution is 180 degree, and arc section is completely parallel, connect the 7th section of parallel wire afterwards, last direct-through line (5) is connected to straight-through end and port b, coupling line (6) is connected to isolation end and port d, joint pad (7) is according to sub-miniature A connector specifications design, the grounding shell of sub-miniature A connector fully contacts with joint pad (7) and underlying metal (3), become earth connection, the holding wire of sub-miniature A connector fully contacts with direct-through line (5) or coupling line (6), becomes holding wire,
Rogers RT6010 sheet material selected by described dielectric-slab (2), thickness 0.5-1mm;
Described underlying metal (3) is coated with metallic copper for cover type, and thickness is 15-40mil;
Described microstrip line (1) is coated with metallic copper, and thickness is 15-40mil.
2. low-temperature directional coupler according to claim 1, is characterized in that: described microstrip line (1) uses graphic-print.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310173048.8A CN103311631B (en) | 2013-05-11 | 2013-05-11 | A kind of low-temperature directional coupler |
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| CN201310173048.8A CN103311631B (en) | 2013-05-11 | 2013-05-11 | A kind of low-temperature directional coupler |
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| CN103311631B true CN103311631B (en) | 2016-01-06 |
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| CN109037877A (en) * | 2018-07-17 | 2018-12-18 | 合肥本源量子计算科技有限责任公司 | A kind of investigating method of cryrogenic coupler and Superconducting Quantum chip |
| CN110197942B (en) * | 2019-06-20 | 2021-04-23 | 中国电子科技集团公司第三十九研究所 | Low-noise attenuator based on microwave directional coupler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05191115A (en) * | 1992-01-16 | 1993-07-30 | Murata Mfg Co Ltd | Directional coupler |
| US5373266A (en) * | 1993-11-09 | 1994-12-13 | The United States Of America As Represented By The Secreatry Of The Army | Microstrip directional coupler |
| CN201450093U (en) * | 2009-08-20 | 2010-05-05 | 广州海格通信集团股份有限公司 | Microstrip coupling line directional coupler applied in UHF frequency range |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6392503B1 (en) * | 2000-05-09 | 2002-05-21 | Nokia Networks Oy | Half-sawtooth microstrip directional coupler |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05191115A (en) * | 1992-01-16 | 1993-07-30 | Murata Mfg Co Ltd | Directional coupler |
| US5373266A (en) * | 1993-11-09 | 1994-12-13 | The United States Of America As Represented By The Secreatry Of The Army | Microstrip directional coupler |
| CN201450093U (en) * | 2009-08-20 | 2010-05-05 | 广州海格通信集团股份有限公司 | Microstrip coupling line directional coupler applied in UHF frequency range |
Non-Patent Citations (1)
| Title |
|---|
| 一种改进型微带线定向耦合器及其应用;魏峰， 史小卫;《西安电子科技大学学报》;20090430;第36卷(第2期);第281-284页 * |
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