CN104156616A - Method for calculating through hole type medium support effective dielectric constants - Google Patents
Method for calculating through hole type medium support effective dielectric constants Download PDFInfo
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Abstract
The invention provides a method for calculating through hole type medium support effective medium constants. The method comprises the steps that firstly, it can be assumed that a coaxial transmission line of through hole medium support is infinitely long, the coaxial transmission line is filled with a medium material, and the medium material does not change in the axial direction of the coaxial line and is unevenly concentrated on the cross section; secondly, the electromagnetic field of the coaxial transmission line filled with the uneven medium material is solved; thirdly, the through hole type medium support effective medium constants are calculated through a formula. By means of the scheme, an effective calculation method of the through hole type medium support effective dielectric constants is established. Compared with a weight method used at present, the method has high calculation precision and high calculation efficiency, and the requirement for through hole type medium support design working can be met very well.
Description
Technical field
The invention belongs to through hole type dielectric support effective dielectric constant computing technique field, in particular a kind of through hole type dielectric support effective dielectric constant computing method.
Background technology
In order to improve the frequency of operation of coaxial transmission line and coaxial connector, the cross sectional dimensions of coaxial transmission line is more and more less.Miniaturization coaxial connector all adopts air dielectric, and standardization and seriation.Dielectric support is to keep relative position between coaxial connector internal and external conductor and requisite important component part, and the introducing of dielectric support has destroyed the continuity of coaxial transmission line.Dielectric support design is very crucial, in meeting characteristic impedance requirement, also will compensate the uncontinuity of medium and air intersection.The specific inductive capacity of dielectric support material more approaches dielectric constant of air, and the uncontinuity of introducing is just less, but the little dielectric material of specific inductive capacity often physical strength is low, processability is poor.Therefore, further reducing dielectric material specific inductive capacity is restricted.Common disposal route is the effective dielectric constant that punching reduces dielectric support in dielectric support, and the effective dielectric constant that can effectively reduce medium support is processed in punching, thereby alleviates the uncontinuity at medium support-air interface place.But the another one problem of also having brought is processed in punching, i.e. the problem identificatioin of medium support effective dielectric constant after punching.For ensureing connector impedance matching, designer need to accurately know the effective dielectric constant of the rear medium support of punching.But the problem identificatioin of perforated media support effective dielectric constant never obtains fine solution.At present, when design medium supports, generally there are two kinds of disposal routes.One method is by electromagnetic field simulation software such as HFSS.But, Zhe Lei simulation software is calculation medium support effective dielectric constant directly, just utilizes them to carry out some assistant analysis, and design efficiency is very low.Another kind method is to utilize the effective dielectric constant of rough method estimation perforated media support, and this method precision is very poor, is only adapted to the coaxial connector dielectric support design that technical indicator is not high.
Because existing electromagnetic field simulation software can only treatment media support the direct problem in design effort, calculated characteristic impedance, the S parameter etc. of connector by known specific inductive capacity, version etc., and cannot directly calculate the effective dielectric constant of perforated media support.Thereby, the mode of operation of carrying out medium support design by electromagnetic field simulation software (as HFSS) is as follows: designer first determines preliminary design scheme according to self experience, then utilize simulation software to carry out simulation analysis, revise medium support design proposal according to simulation result and personal experience again, so repeatedly, until meet the requirements of design objective.This method for designing, process is loaded down with trivial details, inefficiency, also depends on designer's experience itself simultaneously.
Due to the deficiency of simulation software, when the support of design medium, conventional " weight method " estimates its effective dielectric constant, and computing formula is: ε
equivalence=ε (1-V
hole/ V
always);
Wherein: the specific inductive capacity that ε is dielectric material, V
holefor cutting out the volume of medium, V
alwaysfor dielectric support cumulative volume." weight method " do not considered to cut out the residing position of medium, but coaxial transmission line from inner wire to outer conductor electric field intensity by dying down by force, the medium cutting out is near inner wire and certainly different on the impact of field near outer conductor.Therefore, " weight method " computational accuracy is low, can only be used for the coaxial connector dielectric support design that technical indicator is not high.
Therefore, there is defect in prior art, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is for the deficiencies in the prior art, and a kind of through hole type dielectric support effective dielectric constant computing method are provided.
Technical scheme of the present invention is as follows:
A kind of through hole type dielectric support effective dielectric constant computing method, wherein, comprise the following steps:
Step 1: support can be supposed coaxial transmission line endless for through hole type medium, and dielectric material has been filled in inside, and dielectric material does not axially change along coaxial cable, and discontinuity of materials concentrates on xsect;
Step 2: the electromagnetic field that solves the coaxial transmission line of filling nonhomogeneous media material;
Step 3: for the inhomogeneous coaxial transmission line of xsect dielectric distribution, adopt fan-shaped subdivision, M is along the rotate a circle number of times of equal angles subdivision of polar angle direction, N is the number of times along the equidistant subdivision of radial direction, if the specific inductive capacity of dielectric material is identical in each covering of the fan, be uniformly distributed, the computing formula of setting up through hole medium support effective dielectric constant is as follows:
In formula, a, b are respectively coaxial connector inner and outer conductor radius, represent the specific inductive capacity of the overlapping region medium of n annular regions and m fan section formation in ε (n, m).
Adopt such scheme, set up a kind of effective calculation method of through hole type medium support effective dielectric constant, compared with " weight method " of current use, the method has higher computational accuracy, also have reasonable counting yield simultaneously, can finely meet through hole type medium support design effort demand.
Brief description of the drawings
Fig. 1 is the fan-shaped part schematic diagram of coaxial cable xsect of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
First, according to the practical structures of medium support, it is carried out to rational theoretical abstraction and simplification; Then,, based on electrostatic field theory and subdivision technology, set up through hole type medium support effective dielectric constant computing formula.In order to ensure that dielectric support has some strength, coaxial connector dielectric support must have certain thickness, axial dimension will be enough greatly.Therefore, for through hole type medium, support can be supposed coaxial transmission line endless, and dielectric material has been filled in inside, and dielectric material does not axially change along coaxial cable, and discontinuity of materials concentrates on xsect.Through this hypothesis, a complicated three-dimensional problem is converted into two-dimensional problems, is finally summed up as: the electromagnetic problems that solves the coaxial transmission line of filling nonhomogeneous media material.For this special coaxial transmission line, the main mould of electromagnetic wave of transmission still can be thought TEM pattern, therefore can support the computing formula of effective dielectric constant by the analytical approach of the electrostatic field nonhomogeneous media of deriving.
For the inhomogeneous coaxial transmission line of xsect dielectric distribution, adopt fan-shaped subdivision as shown in Figure 1, M is that N is the number of times along the equidistant subdivision of radial direction along the rotate a circle number of times of equal angles subdivision of polar angle direction.The specific inductive capacity of supposing dielectric material in each covering of the fan is identical, is uniformly distributed.Application electrostatic field theory, the computing formula of setting up through hole medium support effective dielectric constant is as follows:
In formula, a, b are respectively coaxial connector inner and outer conductor radius, represent the specific inductive capacity of the overlapping region medium of n annular regions and m fan section formation in ε (n, m).
On the basis of foregoing, furthermore, a kind of through hole type dielectric support effective dielectric constant computing method, wherein, comprise the following steps:
Step 1: support can be supposed coaxial transmission line endless for through hole type medium, and dielectric material has been filled in inside, and dielectric material does not axially change along coaxial cable, and discontinuity of materials concentrates on xsect;
Step 2: the electromagnetic field that solves the coaxial transmission line of filling nonhomogeneous media material;
Step 3: for the inhomogeneous coaxial transmission line of xsect dielectric distribution, adopt fan-shaped subdivision, M is along the rotate a circle number of times of equal angles subdivision of polar angle direction, N is the number of times along the equidistant subdivision of radial direction, if the specific inductive capacity of dielectric material is identical in each covering of the fan, be uniformly distributed, the computing formula of setting up through hole medium support effective dielectric constant is as follows:
In formula, a, b are respectively coaxial connector inner and outer conductor radius, represent the specific inductive capacity of the overlapping region medium of n annular regions and m fan section formation in ε (n, m).
Key point of the present invention has following several:
(1) simplify through hole type medium support theoretical model based on reasonable assumption.As a three-dimensional problem, solving of effective dielectric constant of medium support is a complicated problem, realizes difficulty very large.The present invention is based on rational hypothesis, be converted into two-dimensional problems, i.e. the electromagnetic problems of the coaxial transmission line of horizontal non-homogeneous filling, thus can solve by means of electrostatic field theory, problem is simplified.
(2) process nonhomogeneous media problem based on subdivision thought.Utilize subdivision to process nonhomogeneous media support is subdivided into uniform dielectric unit, be converted to uniform dielectric problem by nonhomogeneous media problem, set up on this basis effective dielectric constant computing formula.
Protection point of the present invention has following several:
(1) set up thought and the concrete grammar of through hole type medium support effective dielectric constant computing formula.
(2) through hole type medium support effective dielectric constant computing formula.
The present invention has set up a kind of effective calculation method of through hole type medium support effective dielectric constant, compared with " weight method " of current use, the method has higher computational accuracy, also has reasonable counting yield simultaneously, can finely meet through hole type medium support design effort demand.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (1)
1. through hole type dielectric support effective dielectric constant computing method, is characterized in that, comprise the following steps:
Step 1: support can be supposed coaxial transmission line endless for through hole type medium, and dielectric material has been filled in inside, and dielectric material does not axially change along coaxial cable, and discontinuity of materials concentrates on xsect;
Step 2: the electromagnetic field that solves the coaxial transmission line of filling nonhomogeneous media material;
Step 3: for the inhomogeneous coaxial transmission line of xsect dielectric distribution, adopt fan-shaped subdivision, M is along the rotate a circle number of times of equal angles subdivision of polar angle direction, N is the number of times along the equidistant subdivision of radial direction, if the specific inductive capacity of dielectric material is identical in each covering of the fan, be uniformly distributed, the computing formula of setting up through hole medium support effective dielectric constant is as follows:
In formula, a, b are respectively coaxial connector inner and outer conductor radius, represent the specific inductive capacity of the overlapping region medium of n annular regions and m fan section formation in ε (n, m).
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Cited By (1)
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| CN105742140A (en) * | 2016-03-03 | 2016-07-06 | 电子科技大学 | Method for reducing equivalent dielectric constant of dielectric material |
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Address after: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee after: CLP kesiyi Technology Co.,Ltd. Address before: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee before: CHINA ELECTRONIC TECHNOLOGY INSTRUMENTS Co.,Ltd. |