CN203521570U - Heat insulation transmission line for coaxial N-type radio frequency calorimeter - Google Patents
Heat insulation transmission line for coaxial N-type radio frequency calorimeter Download PDFInfo
- Publication number
- CN203521570U CN203521570U CN201320672495.3U CN201320672495U CN203521570U CN 203521570 U CN203521570 U CN 203521570U CN 201320672495 U CN201320672495 U CN 201320672495U CN 203521570 U CN203521570 U CN 203521570U
- Authority
- CN
- China
- Prior art keywords
- outer conductor
- radio frequency
- transmission line
- calorimeter
- heat insulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model relates to a heat insulation transmission line for a coaxial N-type radio frequency calorimeter. The transmission line comprises an inner conductor and an outer conductor, wherein the inner conductor is arranged inside the outer conductor; the outer conductor comprises a front segment outer conductor and a rear segment outer conductor; one end of the front segment outer conductor and one end of the rear segment outer conductor are connected through a first sleeve; and the two ends of the outer conductor are respectively provided with a support sleeve and a second sleeve. The heat insulation transmission line provided by the utility model can obtain quite small radio frequency transmission loss within a frequency scope of DC-1 GHz, has a quite good radio frequency input impedance characteristic, realizes the reflection coefficient mold value of input being smaller than 0.008, and ensures that the radio frequency calorimeter has quite high efficiency.
Description
Technical field
The present invention relates to a kind of coaxial transmission line, particularly a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter.
Background technology
Along with scientific and technical high speed development, engendered many new high-end electronic devices, the precision of radio-instrument is also more and more higher, impels Radio Measurement technology to develop towards higher level.Radio-frequency power is one of parameter the most basic in RF application.At present, for meeting industrial technology and economy development requirement, each state is all developing the radio-frequency power benchmark of oneself.Frequency range is more and more wider, and certainty of measurement and power range are also more and more higher.
Radio frequency calorimeter because of its accuracy high by extensively in order to set up even benchmark of national radio-frequency power standard, at present mainly contain the Precision Coaxial joint geometries such as APC14mm, APC7mm both at home and abroad.In the composition of calorimeter, rf inputs between load, have one section can be by the transmission line of Measurement accuracy.In order to realize the calorimeter of high accuracy, its transmission line requires to meet 50 Ω characteristic impedances, and has good electrical characteristics and heat-proof quality.
In the coaxial calorimeter such as existing APC14mm, APC7mm, mainly adopt epoxide resin material both at home and abroad, and the gold-plated technology of mating surface, make inner wire and the outer conductor of transmission line, although guaranteed electrical characteristics, more difficultly met characteristic impedance matched well and there is heat insulation performance simultaneously.At present, stainless steel pipe is used widely in radio-frequency transmission line design, and in calorimeter application, requires the wall thickness of stainless steel pipe the smaller the better, but current Machining Technology is difficult to realize long single stainless-steel thin-wall pipe.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter, difficult in order to solve transmission line performance coupling, the problem of machining inconvenience.
For solving the problems of the technologies described above, this invention adopts following technical proposals:
For a heat insulation transmission line for coaxial N-type radio frequency calorimeter, this transmission line comprises
Inner wire and outer conductor, described inner wire is arranged on outer conductor inside;
Described outer conductor comprises leading portion outer conductor and back segment outer conductor, and one end of described leading portion outer conductor is connected by the first sleeve with one end of back segment outer conductor;
The two ends of described outer conductor are respectively equipped with stop sleeve and the second sleeve.
Preferably, described inner wire employing length is the stainless steel tube that 150mm, external diameter are 3.04mm.
Preferably, the two ends of described inner wire are provided with the internal thread core mating with N connector; Be convenient to install with the load of radio frequency calorimeter.
Preferably, one end of described inner wire is connected with the radio frequency calorimeter load with N connector by internal thread core.
Preferably, the end of described stop sleeve and the end of described outer conductor are in same plane, and described stop sleeve is fixed by welding on outer conductor; This stop sleeve is used for providing transmission line and radio frequency calorimeter front panel to fix.
Preferably, described back segment outer conductor is by being with female the second sleeve to be connected with radio frequency calorimeter load outer conductor; Be convenient to install with radio frequency calorimeter load outer conductor.
Preferably, described the second sleeve by reinforcement of weld on back segment outer conductor.
Preferably, it is the stainless steel tube that 0.25mm, internal diameter are 7mm that described outer conductor adopts thickness, and the total length after described leading portion outer conductor is connected with back segment outer conductor is 150mm; It is the stainless steel tube that 0.25mm, internal diameter are 7mm that outer conductor adopts thickness, has met the good requirement of thermal conductivity, is convenient to machining simultaneously, in order to obtain best effect of heat insulation, saves material simultaneously, and outer conductor total length is elected 150mm as.
Preferably, described inner wire skin is coated with the thick gold of one deck 10 μ m; It is in order to increase the electronics skin effect of inner wire, to have better electric conductivity that inner wire skin is coated with gold layer.
Preferably, described in this transmission line, sleeve all adopts metallic copper to make.Technical scheme of the present invention can obtain less radio frequency transmission loss within the scope of frequency DC～1GHz, has extraordinary radio frequency input impedance characteristic, and the amplitude of reflection coefficient of realizing input is less than 0.008, has guaranteed that radio frequency calorimeter has higher efficiency.
Accompanying drawing explanation
Fig. 1 is shown a kind of heat insulation schematic diagram of transmission lines for coaxial N-type radio frequency calorimeter.
1, stop sleeve, 2, leading portion outer conductor, 3, inner wire, the 4, first sleeve, 5, back segment outer conductor, the 6, second sleeve, 7, the load of radio frequency calorimeter, 8, radio frequency calorimeter load outer conductor, 9, the internal thread core that mates with N connector.
Embodiment
With reference to the accompanying drawings the present invention is described further below.
For a heat insulation transmission line for coaxial N-type radio frequency calorimeter, this transmission line comprises inner wire 3 and outer conductor, and described inner wire 3 is arranged on outer conductor inside; It is 150mm that described inner wire 3 adopts length, its external diameter is the stainless steel tube of 3.04mm, the skin of described inner wire 3 is coated with the thick gold of one deck 10 μ m, the inner wire electronics skin effect being coated with after gold is better, increase electric conductivity, inner wire two ends are provided with the internal thread core 9 mating with N connector, and inner wire two ends are provided with internal thread core and are convenient to be connected with general external equipment, and one end of described inner wire 3 is for being connected with radio frequency calorimeter load 7; In order to meet the heat-proof quality of transmission line, do not change again the characteristic impedance of transmission line, described outer conductor is divided into leading portion outer conductor 2 and back segment outer conductor 5, it is the stainless steel tube that 7mm, thickness are 0.25mm that described outer conductor adopts internal diameter, in pipe, without scar, meet certain brightness, be beneficial to transmission, described leading portion outer conductor 2 has been attacked external screw thread with the junction of back segment outer conductor 5, and fixing by the first sleeve 4 with accurate internal thread made of copper; Described outer conductor two ends are provided with stop sleeve 1 made of copper and the second sleeve 6 made of copper; The end of the end of described stop sleeve 1 and leading portion outer conductor 2 is in same plane, and described stop sleeve 1 is fixed on by spot welding on the outer wall of described leading portion outer conductor 2, for providing transmission line and radio frequency calorimeter front panel to fix; Describedly be with female the second sleeve 6 fixing by spot welding and described back segment outer conductor 5, the other end of described back segment outer conductor 5 is connected by the second sleeve 6 with radio frequency calorimeter load outer conductor 8.
In order to obtain best heat-proof quality, more than the length of transmission line of radio frequency calorimeter requires to reach 150mm, and processing elongated single stainless-steel thin-wall pipe like this, due to its poor rigidity, its intensity does not reach requirement, easily distortion, and then the characteristic impedance of change transmission line.The present invention is divided into two sections by the light-wall pipe in outer conductor, by being with female the first sleeve 4 to be spirally connected, total length after two light-wall pipes connect is 150mm, the method has met heat-proof quality, can not change again the characteristic impedance of heat insulation transmission line, pipe domestic demand meets without scar, has certain brightness.Stop sleeve 1 in outer conductor is for providing the front panel fixed support with radio frequency calorimeter.
One aspect of the present invention realizes radiofrequency signal high-efficiency transfer to the load of radio frequency calorimeter, and its efficiency efficiency of transmission in 1GHz approaches 100%; The heat of realizing on the other hand the load outer conductor absorption of radio frequency calorimeter does not reach outside radio frequency calorimeter outward, and the temperature of cutting off the outer environment of radio frequency calorimeter has influence on the temperature of the load outer conductor of radio frequency calorimeter, according to adopted material and physical dimension, its heat insulation ratio reaches 17:400, and the variation of ambient temperature amount of radio frequency calorimeter is 1 ℃.The temperature variation that heat insulation transmission line of the present invention conducts to radio frequency calorimeter load outer conductor is 0.0425 ℃, can effectively play effect of heat insulation.
By technique scheme, can within the scope of frequency DC～1GHz, obtain less radio frequency transmission loss, have extraordinary radio frequency input impedance characteristic, the amplitude of reflection coefficient of realizing input is less than 0.008, has guaranteed that radio frequency calorimeter has higher efficiency.
Can be understood as, the present invention is described by some embodiment, and those skilled in the art without departing from the spirit and scope of the present invention, can carry out various changes or equivalence replacement to these features and embodiment.In addition, under instruction of the present invention, can modify to adapt to concrete situation and material and can not depart from the spirit and scope of the present invention these features and embodiment.Therefore, the present invention is not subject to the restriction of specific embodiment disclosed herein, and the embodiment within the scope of all the application's of falling into claim belongs to protection scope of the present invention.
Claims (10)
1. for a heat insulation transmission line for coaxial N-type radio frequency calorimeter, it is characterized in that: this transmission line comprises
Inner wire and outer conductor, described inner wire is arranged on outer conductor inside;
Described outer conductor comprises leading portion outer conductor and back segment outer conductor, and one end of described leading portion outer conductor is connected by the first sleeve with one end of back segment outer conductor;
The two ends of described outer conductor are respectively equipped with stop sleeve and the second sleeve.
2. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 1, is characterized in that: it is the stainless steel tube that 150mm, external diameter are 3.04mm that described inner wire adopts length.
3. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 1, is characterized in that: the two ends of described inner wire are provided with the internal thread core mating with N connector.
4. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 3, is characterized in that: one end of described inner wire is connected with the radio frequency calorimeter load with N connector by internal thread core.
5. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 1, is characterized in that: the end of described stop sleeve and the end of described outer conductor are in same plane, and described stop sleeve is fixed by welding on outer conductor.
6. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 1, is characterized in that: described back segment outer conductor is by being with female the second sleeve to be connected with radio frequency calorimeter load outer conductor.
7. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 6, is characterized in that: described the second sleeve by reinforcement of weld on back segment outer conductor.
8. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 1, it is characterized in that: it is the stainless steel tube that 0.25mm, internal diameter are 7mm that described outer conductor adopts thickness, and the total length after described leading portion outer conductor is connected with back segment outer conductor is 150mm.
9. a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter according to claim 1, is characterized in that: described inner wire skin is coated with the thick gold of one deck 10 μ m.
10. according to a kind of heat insulation transmission line for coaxial N-type radio frequency calorimeter described in claim 1 to 7 any one, it is characterized in that: described in this transmission line, sleeve all adopts metallic copper to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320672495.3U CN203521570U (en) | 2013-10-29 | 2013-10-29 | Heat insulation transmission line for coaxial N-type radio frequency calorimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320672495.3U CN203521570U (en) | 2013-10-29 | 2013-10-29 | Heat insulation transmission line for coaxial N-type radio frequency calorimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203521570U true CN203521570U (en) | 2014-04-02 |
Family
ID=50380451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320672495.3U Expired - Fee Related CN203521570U (en) | 2013-10-29 | 2013-10-29 | Heat insulation transmission line for coaxial N-type radio frequency calorimeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203521570U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104616806A (en) * | 2014-12-30 | 2015-05-13 | 北京无线电计量测试研究所 | Low-thermal electromotive force cable |
| CN108155450A (en) * | 2017-12-25 | 2018-06-12 | 北京无线电计量测试研究所 | A kind of waveguide insulated delivery line for calorimetric power standard |
-
2013
- 2013-10-29 CN CN201320672495.3U patent/CN203521570U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104616806A (en) * | 2014-12-30 | 2015-05-13 | 北京无线电计量测试研究所 | Low-thermal electromotive force cable |
| CN108155450A (en) * | 2017-12-25 | 2018-06-12 | 北京无线电计量测试研究所 | A kind of waveguide insulated delivery line for calorimetric power standard |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201937220U (en) | High-voltage insulating bus connecting device | |
| CN201061117Y (en) | 110kV-220kV crosslinked cable middle joint | |
| CN203521570U (en) | Heat insulation transmission line for coaxial N-type radio frequency calorimeter | |
| CN204103388U (en) | Insulating electrical casing pipe | |
| CN205621837U (en) | Coaxial converter of waveguide | |
| CN203553090U (en) | High-performance standing wave debugging apparatus for space travelling wave tube | |
| CN204615109U (en) | A kind of high-performance minor structure SMA connector | |
| CN203535080U (en) | SMA type RF testing probe | |
| CN202772253U (en) | Four-in-one HF high-power synthesizer | |
| CN204303963U (en) | For the seamless type flexible waveguide of travelling-wave tubes | |
| CN204229945U (en) | A kind of hardware being provided with insulation system | |
| CN204012057U (en) | A kind of low cost radio frequency coaxial cable connector | |
| CN204793360U (en) | Join in marriage coaxial electric connector of curved formula radio frequency who connects flexible cable | |
| CN204534708U (en) | Micro-wave oven | |
| CN203774437U (en) | Coaxial power divider | |
| CN204333204U (en) | Directional coupler | |
| CN203326108U (en) | Antenna | |
| CN104022419B (en) | High performance precision microwave adapter | |
| CN101159184A (en) | Radio-frequency cable inner conductor pipe and its processing method | |
| CN202797221U (en) | Novel microwave rotary joint waveguide | |
| CN201478424U (en) | Coaxial load | |
| CN203326106U (en) | Antenna | |
| CN206610669U (en) | A kind of wire that can partly change | |
| CN204943805U (en) | Piping fitt | |
| CN103857079A (en) | Carbon fiber heating tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20151029 |
|
| EXPY | Termination of patent right or utility model |