CN104156616B - Method for calculating through hole type medium support effective dielectric constants - Google Patents
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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, more particularly to a kind of through hole
Type dielectric support effective dielectric constant computational methods.
Background technology
In order to improve the operating frequency of coaxial transmission line and coaxial connector, the cross sectional dimensions of coaxial transmission line are increasingly
It is little.Miniaturization coaxial connector adopts air dielectric, and standardization and seriation.Dielectric support is to maintain coaxially connected
Relative position between device internal and external conductor and requisite important component part, the introducing of dielectric support destroys coaxial transmission line
Seriality.Dielectric support design is very crucial, while characteristic impedance requirement is met, will also be at medium and air interface
Discontinuity compensate., closer to dielectric constant of air, the discontinuity of introducing is just for the dielectric constant of dielectric support material
It is less, but the little dielectric material of dielectric constant often mechanical strength is low, processability is poor.Therefore, medium material is further reduced
Material dielectric constant is restricted.Common processing method is that punching is normal to reduce the equivalent dielectric of dielectric support in dielectric support
Number, punching processes the effective dielectric constant that can effectively reduce medium support, so as to mitigate not connecting at medium support-air interface
Continuous property.But punching is processed and also brings another question, that is, medium supports the determination problem of effective dielectric constant after punching.To protect
Card adapter impedance matching, designer needs the effective dielectric constant for accurately knowing medium support after punching.But perforated media support etc.
The determination problem of effect dielectric constant is never solved very well.At present, designing when medium is supportted typically has two kinds of processing methods.
A kind of method is by electromagnetic field simulation softwares such as HFSS.But, this kind of simulation software directly calculation medium cannot support equivalent Jie
Electric constant, just with them some assistant analysis are carried out, and design efficiency is very low.Another kind of method is estimated using rough method
The effective dielectric constant of perforated media support is calculated, this method precision is very poor, is only adapted to the not high coaxial connector of technical specification
Dielectric support is designed.
Because existing electromagnetic field simulation software can only process the direct problem in medium support design work, i.e., by known dielectric
Constant, version etc. calculate characteristic impedance, S parameter of adapter etc., and cannot directly calculate the equivalent of perforated media support
Dielectric constant.Thus, the mode of operation for carrying out medium support design by electromagnetic field simulation software (such as HFSS) is as follows：Designer
First preliminary design scheme is determined according to experience, then simulation analysis are carried out using simulation software, further according to simulation result
With personal experience's modification medium support design, so repeatedly, the design objective until reaching requirement.This method for designing, mistake
Journey is loaded down with trivial details, inefficiency, while also relying on the experience of designer itself.
Due to the deficiency of simulation software, when design medium is supportted, commonly use " weight method " to estimate its effective dielectric constant, calculate
Formula is：εIt is equivalent=ε (1-VHole/VAlways)；
Wherein：ε for dielectric material dielectric constant, VHoleTo cut out the volume of medium, VAlwaysFor dielectric support cumulative volume." claim
Weight method " does not account for cutting out medium location, but coaxial transmission line from inner wire to outer conductor electric field intensity by dying down by force,
Impact affirmative of the medium for cutting out near inner wire and near outer conductor to field is different.Therefore, " weight method " computational accuracy is low,
It is only used for the not high coaxial connector dielectric support design of technical specification.
Therefore, prior art existing defects, need to improve.
The content of the invention
The technical problem to be solved is for the deficiencies in the prior art, there is provided a kind of through hole type dielectric support etc.
Effect dielectric constant computational methods.
Technical scheme is as follows：
A kind of through hole type dielectric support effective dielectric constant computational methods, wherein, comprise the following steps：
Step 1：For the support of through hole type medium may be assumed that coaxial transmission line endless, inside is filled with dielectric material, medium
Material is not changed in along the axial direction of coaxial line, and discontinuity of materials is concentrated on cross section；
Step 2：Solve the electromagnetic field of the coaxial transmission line of filling non-uniform dielectric material；
Step 3：The coaxial transmission line uneven for cross section dielectric distribution, using fan-shaped subdivision, M is along polar
Angle direction rotates a circle the number of times of angularly subdivision, and N is the number of times along the equidistant subdivision of radial direction, if in each covering of the fan
The dielectric constant of dielectric material is identical, that is, be uniformly distributed, and the computing formula for setting up through hole medium support effective dielectric constant is as follows：
In formula, a, b are respectively in coaxial connector inner and outer conductor radius, ε (n, m) and represent n-th annular regions with m-th
The dielectric constant of medium in the overlapping region that fan section is constituted.
Using such scheme, a kind of effective calculation method that through hole type medium supports effective dielectric constant is established, it is and current
" weight method " for using is compared, and the method has higher computational accuracy, while also reasonable computational efficiency, can be fine
Meet through hole type medium support design work demand.
Description of the drawings
Fig. 1 is coaxial line cross section sector portion schematic diagram of the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
First, rational theoretical abstraction and simplification are carried out to it according to the practical structures of medium support；Then, based on electrostatic field
Theoretical and partitioning techniques, set up through hole type medium support effective dielectric constant computing formula.In order to ensure that dielectric support has necessarily
Intensity, coaxial connector dielectric support must have certain thickness, and axial dimension will be enough to greatly.Therefore, for through hole type is situated between
Matter support may be assumed that coaxial transmission line endless, and inside is filled with dielectric material, and dielectric material is not changed in along the axial direction of coaxial line,
Discontinuity of materials is concentrated on cross section.The three-dimensional problem of one complexity is converted into into two-dimensional problems through this hypothesis, most
After all become：Solve the electromagnetic problems of the coaxial transmission line of filling non-uniform dielectric material.For this special coaxial biography
Defeated line, the electromagnetic wave main mould of transmission still may be considered TEM mode, therefore can derive by the analysis method of electrostatic field non-equal
The computing formula of even dielectric support effective dielectric constant.
The coaxial transmission line uneven for cross section dielectric distribution, using fan-shaped subdivision as shown in Figure 1, M is along pole
The angle direction of coordinate rotates a circle the number of times of angularly subdivision, and N is the number of times along the equidistant subdivision of radial direction.Assume each
The dielectric constant of dielectric material is identical in individual covering of the fan, that is, be uniformly distributed.Using electrostatic field theory, set up through hole medium and support equivalent Jie
The computing formula of electric constant is as follows：
In formula, a, b are respectively in coaxial connector inner and outer conductor radius, ε (n, m) and represent n-th annular regions with m-th
The dielectric constant of medium in the overlapping region that fan section is constituted.
On the basis of the above, furthermore, a kind of through hole type dielectric support effective dielectric constant computational methods,
Wherein, comprise the following steps：
Step 1：For the support of through hole type medium may be assumed that coaxial transmission line endless, inside is filled with dielectric material, medium
Material is not changed in along the axial direction of coaxial line, and discontinuity of materials is concentrated on cross section；
Step 2：Solve the electromagnetic field of the coaxial transmission line of filling non-uniform dielectric material；
Step 3：The coaxial transmission line uneven for cross section dielectric distribution, using fan-shaped subdivision, M is along polar
Angle direction rotates a circle the number of times of angularly subdivision, and N is the number of times along the equidistant subdivision of radial direction, if in each covering of the fan
The dielectric constant of dielectric material is identical, that is, be uniformly distributed, and the computing formula for setting up through hole medium support effective dielectric constant is as follows：
In formula, a, b are respectively in coaxial connector inner and outer conductor radius, ε (n, m) and represent n-th annular regions with m-th
The dielectric constant of medium in the overlapping region that fan section is constituted.
The key point of the present invention has following several：
(1) through hole type medium support theoretical model is simplified based on reasonable assumption.Used as a three-dimensional problem, medium supports equivalent Jie
The solution of electric constant is the problem of a complexity, realizes that difficulty is very big.The present invention is based on rational it is assumed that being converted into one
Individual two-dimensional problems, i.e., the electromagnetic problems of the coaxial transmission line of horizontal non-homogeneous filling, so as to be entered by means of electrostatic field theory
Row is solved, and is simplified problem.
(2) non-uniform dielectric problem is processed based on subdivision thought.Non-uniform dielectric support is subdivided into using subdivision process
Even media units, will non-uniform dielectric problem be converted to uniform dielectric problem, effective dielectric constant is set up on this basis
Computing formula.
The protection point of the present invention has following several：
(1) thought and concrete grammar of through hole type medium support effective dielectric constant computing formula are set up.
(2) through hole type medium support effective dielectric constant computing formula.
The present invention establishes a kind of effective calculation method that through hole type medium supports effective dielectric constant, and uses at present
" weight method " is compared, and the method has higher computational accuracy, while also reasonable computational efficiency, can very well meet logical
Pass medium supports design work demand.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or be converted,
And all these modifications and variations should all belong to the protection domain of claims of the present invention.
Claims (1)
1. a kind of through hole type dielectric support effective dielectric constant computational methods, it is characterised in that comprise the following steps：
Step 1：For through hole type dielectric support may be assumed that coaxial transmission line endless, inside is filled with dielectric material, medium material
Material is not changed in along the axial direction of coaxial line, and discontinuity of materials is concentrated on cross section；
Step 2：Solve the electromagnetic field of the coaxial transmission line of filling non-uniform dielectric material；
Step 3：The coaxial transmission line uneven for cross section dielectric distribution, using fan-shaped subdivision, M is along polar angle
Direction rotates a circle the number of times of angularly subdivision, and N is the number of times along the equidistant subdivision of radial direction, if medium in each covering of the fan
The dielectric constant of material is identical, that is, be uniformly distributed, and the computing formula for setting up through hole type dielectric support effective dielectric constant is as follows：
In formula, a, b are respectively in coaxial connector inner and outer conductor radius, ε (n, m) and represent that n-th annular regions is fan-shaped with m-th
The dielectric constant of medium in the overlapping region that area is constituted.
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| CN101441325A (en) * | 2007-11-20 | 2009-05-27 | 中国科学院光电技术研究所 | Design method of multi-layer metal dielectric film capable of implementing imaging function |
| CN101604349A (en) * | 2009-07-02 | 2009-12-16 | 北京理工大学 | A kind of control signal transmission synchronizing method |
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| CN101441325A (en) * | 2007-11-20 | 2009-05-27 | 中国科学院光电技术研究所 | Design method of multi-layer metal dielectric film capable of implementing imaging function |
| CN101604349A (en) * | 2009-07-02 | 2009-12-16 | 北京理工大学 | A kind of control signal transmission synchronizing method |
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| APC7型精密同轴空气线的设计和研制;宋素秀 等;《宇航计测技术》;19861231(第5期);第14页引言，第16页，图3 * |
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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. |