CN205657149U - A subminiature choke for transmission shaft in waveguide - Google Patents
A subminiature choke for transmission shaft in waveguide Download PDFInfo
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- CN205657149U CN205657149U CN201620490849.6U CN201620490849U CN205657149U CN 205657149 U CN205657149 U CN 205657149U CN 201620490849 U CN201620490849 U CN 201620490849U CN 205657149 U CN205657149 U CN 205657149U
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Abstract
The utility model discloses a subminiature choke for transmission shaft in waveguide, including the transmission shaft, overlap the waveguide outer wall in the transmission shaft outside, be equipped with the first round hole and the second round hole that just are the echelonment each other that are used for passing the transmission shaft on the waveguide outer wall, the diameter of first round hole is less than the second round hole, still including the cover in the transmission shaft outside and be located second round hole and waveguide outer wall in close contact with's dielectric slab, wherein, there are the clearance in transmission shaft and waveguide outer wall, dielectric slab contactless. The utility model discloses do not receive the restriction of quarter wavelength length for the design of choke is more nimble, can require optimization to select suitable axial and radial length according to actual, adopt the medium to fill in radial waveguide impedance section, reduced guide wavelength effectively to make the required length of impedance conversion reduce, make the choke further to miniaturize, the structure is very simple, and easily processing realization is applicable to the choke occasion to volume dimensional requirement is very strict.
Description
Technical field
The invention belongs to the leak-proof device field in microwave transmission field, particularly microwave, be specifically related to a kind of microminiature choke of power transmission shaft in waveguide.
Background technology
Choke is a kind of device avoiding microwave to leak.At present, choke is widely used in the occasions such as the rotary joint in the commissure of microwave antenna-feedback system, all kinds of mechanical scanning radar, contactless short-circuit plunger, household microwave oven, is the critical device of microwave engineering.People need according to actual application, devise choke miscellaneous, compared and be typically include microwave heating chokes [Chen Shaoping, the research of open type microwave applicator, modern electronic technology, 2006(7)], the antenna [Xiang-YU of band choke structure
Cao, Analysis of Coaxial Multimode Horn of Two Chokes, IEEE 1998], Dual-channel Combinatorial Rotary Joint [Wang Qunjie etc., the design of Dual-channel Combinatorial Rotary Joint, fire control radar technology, 2006], the coaxial type rotating joint [army of residence, the engineering design of Rectangular Waveguide Rotary Joint with Coaxial Door knob, microwave journal, Vol 19 No.4, Dec 2003], circular waveguide formula rotary joint [Zhu Yiping, high power circular rotate interlinkage design and simulation study, radar and antagonism, 2006], microstrip coupled formula rotary joint etc..
At present, along with the development and deeply of electromechanical integration, the most more and more occur that power transmission shaft enters the situation in waveguide.In this case, in order to ensure the good rotation of power transmission shaft, gap between it and wave guide wall, is necessarily left.These gaps can cause microwave leakage, can impact the performances such as the standing wave of waveguide, loss and power capacity simultaneously.Therefore, design and a kind of can be used for the choke of power transmission shaft in waveguide and have great importance.But, aforementioned all chokes are not all suitable for transmission shaft structure in waveguide.
At present, can be applicable to the choke of power transmission shaft in waveguide is: " a kind of small-sized broadband choke of power transmission shaft in guided wave system " patent of invention of Patent No. ZL200910252877.9.This patent of invention uses the method for two quarter-wave section foldings to realize the target of chokes, specific practice is: gap between choke inwall and power transmission shaft forms a quarter-wave low characteristic impedance section, and the gap between inwall and the shell of choke forms a quarter-wave and grows tall characteristic impedance section；High characteristic impedance section forms short circuit in choke cover top portion, and short dot, after the conversion of two quarter-wave sections, forms electrical short (actually and not in contact with) at the power transmission shaft interface with guided wave system, suppresses microwave leakage.After this choke can solve to introduce power transmission shaft in waveguide, the microwave leakage problem being likely to result at drive shaft inlets, there is small volume, the less feature of energy leakage.But, this choke is due to the restriction of quarter-wave length and the requirement of characteristic impedance section impedance, and its axial dimension and radial dimension are all difficult to reduce, and cause the chokes occasion some volume size requirements are the strictest to be applied；It addition, under microwave high-frequency section application scenario, the related elements size of this choke needs proportional reducing, too small size makes to process realization and becomes extremely difficult.Therefore, overcome above deficiency, study a kind of in waveguide the microminiature choke of power transmission shaft significant.
Summary of the invention
It is an object of the invention to provide a kind of microminiature choke of power transmission shaft in waveguide, after solving waveguide introduces power transmission shaft, the microwave leakage problem at drive shaft inlets, have the advantages that volume is extra small, be prone to that processing realizes, energy leakage is few.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of microminiature choke of power transmission shaft in waveguide, including power transmission shaft, the waveguide outer wall being placed on outside power transmission shaft, is provided with for through the first power transmission shaft and the most stepped circular hole and the second circular hole on waveguide outer wall, and the diameter of the first circular hole is less than the second circular hole；Also including being placed on outside power transmission shaft and be positioned at the dieelctric sheet that the second circular hole is in close contact with waveguide outer wall, wherein, power transmission shaft does not contacts with waveguide outer wall, dieelctric sheet, there is gap.
In order to make the position of dieelctric sheet fix, present invention additionally comprises and be placed on power transmission shaft base that is outer and that be in close contact with dieelctric sheet and waveguide outer wall, and power transmission shaft does not contacts with base, there is gap.
Specifically, described power transmission shaft overlaps with waveguide outer wall, dieelctric sheet, the axis of base.
Further, described base includes one-time formed and in step-like top and flange, and described top is in close contact with dieelctric sheet, described flange and the close contact of waveguide outer wall and fix with waveguide outer wall.
As preferably, the internal diameter of described dieelctric sheet and base is not less than the diameter of the first circular hole, and the overall diameter on dieelctric sheet and top is not more than the diameter of the second circular hole.
As preferably, described dieelctric sheet is made up of dielectric；The inwall of described waveguide outer wall, the outer surface of power transmission shaft, the inner surface of dieelctric sheet, upper surface, lower surface, or the waveguide outer wall that contacts with the inner surface of dieelctric sheet, upper surface, lower surface and the corresponding surface of base, and the inner surface of base made by metal material.
It addition, the profile of waveguide outer wall adapts with actual application environment, dieelctric sheet can be as required to axial bending.So it is easy to the practical situation adaptation of choke and microwave transmission system.
The operation principle of the present invention is: the gap between inwall and the power transmission shaft of waveguide outer wall forms the coaxial waveguide impedance section of certain length, and the dieelctric sheet between waveguide outer wall and base forms the radial waveguide impedance section of certain length；Radial waveguide impedance section forms short circuit at the outer wall of dieelctric sheet, and short dot, after radial waveguide impedance section and coaxial waveguide impedance section convert, forms electrical short (actually and not in contact with) at the certain position in gap, suppresses microwave leakage.
The invention have the benefit that
The length of coaxial waveguide impedance section of the present invention and radial waveguide impedance section is not limited by quarter-wave length so that the design of choke is more flexible, can be according to actual requirement optimized choice the most axially and radially length；Use dieelctric sheet to fill in radial waveguide impedance section, efficiently reduce waveguide wavelength, so that length needed for impedance transformation reduces so that choke can miniaturization further；Choke is only made up of waveguide outer wall, dieelctric sheet, base, and its structure is the simplest, it is easy to processing realizes, it is adaptable to volume size is required the strictest chokes occasion, particularly microwave high-frequency section application scenario.
Accompanying drawing explanation
Fig. 1 is the sectional structure schematic diagram of the present invention-embodiment.
Fig. 2 is the sectional structure schematic diagram for the RADIAL feed system with power transmission shaft of the present invention-embodiment.
Fig. 3 is the leakage energy diagram of a leakage hole in the RADIAL feed system with power transmission shaft of the present invention-embodiment.
Wherein, the parts that in accompanying drawing, labelling is corresponding are entitled:
1 waveguide outer wall, 2 first circular holes, 3 second circular holes, 4 power transmission shafts, 5 dieelctric sheets, 6 bases, 6a top, 6b flange, 7 RADIAL feed systems, 7a top board, 7b base plate, 8 coupling probe bases, 9 outputs are coaxial.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.Embodiments of the present invention include but not limited to the following example.
Embodiment
As shown in Figure 1, a kind of microminiature choke of power transmission shaft in waveguide, including power transmission shaft 4, waveguide outer wall 1, cylindrical shape dieelctric sheet 5, base 6, two mutual the first stepped circular hole 2 and the second circular holes 3 it are provided with in the middle part of waveguide outer wall 1, wherein the diameter of the first circular hole 2 is less than the second circular hole 3, power transmission shaft 4 is through the first circular hole 2 and the second circular hole 3, cylindrical shape dieelctric sheet 5 is placed on outside power transmission shaft 4 and is positioned at the second circular hole 3 and is in close contact with waveguide outer wall 1, and base 6 is placed on outside power transmission shaft 4 and is in close contact with dieelctric sheet 5 and waveguide outer wall 1.
In the present embodiment, base 6 includes one-time formed top 6a and flange 6b, top 6a and flange 6b is step-like, top 6a is for being in close contact with dieelctric sheet 5, flange 6b is for being in close contact with waveguide outer wall 1 and fixing with waveguide outer wall 1, dieelctric sheet 5 is identical with the external diameter of the internal diameter of base 6 and the first circular hole 2, dieelctric sheet 5 is identical with the external diameter of the external diameter of top 6a, the second circular hole 3, power transmission shaft 4 does not contacts with waveguide outer wall 1, dieelctric sheet 5, base 6, and power transmission shaft 4 overlaps with waveguide outer wall 1, dieelctric sheet 5, the axis of base 6.
The waveguide outer wall 1 of the present embodiment, power transmission shaft 4, base 6 are each made of a metal, and dieelctric sheet 5 is made up of 95% aluminium oxide ceramics, and relative dielectric constant is taken as 9.0.
The profile of the waveguide outer wall 1 of the present embodiment adapts with actual application environment.
Fig. 2 is the present embodiment sectional structure schematic diagram for the RADIAL feed system with power transmission shaft, figure only represents the structure of one of them coupling outlet: microwave transmits in RADIAL feed system 7, and this RADIAL feed system 7 is made up of top board 7a and base plate 7b；In RADIAL feed system 7, cylindrical coupling probe base 8 is connected as a single entity with base plate 7b；It is made up of through the outer wall of feed system 7 with output coaxial 9 power transmission shaft 4 of driven by motor and couple outlet, thus couple to export and export microwave；In the junction of power transmission shaft 4 with coupling probe base 8, use the choke of the present embodiment.Waveguide outer wall 1 in choke is the interior section of coupling probe base 8, and dieelctric sheet 5, base 6 are sequentially placed in the circular hole of waveguide outer wall 1, and are in close contact, and base 6 is fixed on base plate 7b.
When microwave operational frequencies is 12.5GHz, the present embodiment concrete the most a size of: power transmission shaft 4 diameter 2.5mm；Internal diameter (external diameter of the i.e. first circular hole 2) 3mm, high 1.5mm of waveguide outer wall 1；The internal diameter 3mm of dieelctric sheet 5, external diameter 8mm, high 1.5mm；The external diameter 8mm of the internal diameter 3mm of base 6, top 6a.
As shown in Figure 3, numerical simulation structure shows: the present embodiment (11.8-13.1GHz) leakage loss in the frequency band range that RADIAL feed system needs is less than-30dB, the concentration field intensity that choke itself causes, much smaller than the field intensity in RADIAL feed system, does not the most affect the power capacity of whole feed system.This illustrates that this choke has the ability of good suppression microwave leakage in the relative bandwidth of 10.4%, and its radial diameter is only 8mm, and axial Len req is only 3mm, has subminiature feature.
According to above-described embodiment, the present invention just can be realized well.What deserves to be explained is; on the premise of above-mentioned design principle; for solving same technical problem; even if some made on architecture basics disclosed in this invention are without substantial change or polishing; the essence of the technical scheme used is still as the present invention, therefore it should also be as in protection scope of the present invention.
Claims (6)
1. the microminiature choke of power transmission shaft in waveguide, it is characterized in that, including power transmission shaft, the waveguide outer wall being placed on outside power transmission shaft, being provided with on waveguide outer wall for through the first power transmission shaft and the most stepped circular hole and the second circular hole, the diameter of the first circular hole is less than the second circular hole；Also including being placed on outside power transmission shaft and be positioned at the dieelctric sheet that the second circular hole is in close contact with waveguide outer wall, wherein, power transmission shaft does not contacts with waveguide outer wall, dieelctric sheet, there is gap.
A kind of microminiature choke of power transmission shaft in waveguide the most according to claim 1, it is characterised in that also include being placed on power transmission shaft base that is outer and that be in close contact with dieelctric sheet and waveguide outer wall, and power transmission shaft does not contacts with base, there is gap.
A kind of microminiature choke of power transmission shaft in waveguide the most according to claim 2, it is characterised in that described power transmission shaft overlaps with waveguide outer wall, dieelctric sheet, the axis of base.
A kind of microminiature choke of power transmission shaft in waveguide the most according to claim 2, it is characterized in that, described base includes one-time formed and in step-like top and flange, described top is in close contact with dieelctric sheet, and described flange is in close contact with waveguide outer wall and fixes with waveguide outer wall.
A kind of microminiature choke of power transmission shaft in waveguide the most according to claim 4, it is characterised in that the internal diameter of described dieelctric sheet and base is not less than the diameter of the first circular hole, and the external diameter on dieelctric sheet and top is not more than the diameter of the second circular hole.
A kind of microminiature choke of power transmission shaft in waveguide the most according to claim 2, it is characterised in that described dieelctric sheet is made up of dielectric；The inwall of described waveguide outer wall, the outer surface of power transmission shaft, the inner surface of dieelctric sheet, upper surface, lower surface, and the inner surface of base made by metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620490849.6U CN205657149U (en) | 2016-05-25 | 2016-05-25 | A subminiature choke for transmission shaft in waveguide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620490849.6U CN205657149U (en) | 2016-05-25 | 2016-05-25 | A subminiature choke for transmission shaft in waveguide |
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| CN205657149U true CN205657149U (en) | 2016-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811051A (en) * | 2016-05-25 | 2016-07-27 | 西南交通大学 | Microminiature choke for transmission shaft in waveguide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811051A (en) * | 2016-05-25 | 2016-07-27 | 西南交通大学 | Microminiature choke for transmission shaft in waveguide |
| CN105811051B (en) * | 2016-05-25 | 2019-04-05 | 西南交通大学 | A kind of microminiature choke for transmission shaft in waveguide |
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