CN108493542B - A kind of coaxial line mode filter improving itself higher hamonic wave - Google Patents
A kind of coaxial line mode filter improving itself higher hamonic wave Download PDFInfo
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- CN108493542B CN108493542B CN201810150772.1A CN201810150772A CN108493542B CN 108493542 B CN108493542 B CN 108493542B CN 201810150772 A CN201810150772 A CN 201810150772A CN 108493542 B CN108493542 B CN 108493542B
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- resonance structure
- higher hamonic
- coaxial line
- hamonic wave
- induction part
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- 230000006698 induction Effects 0.000 claims description 25
- 239000004020 conductor Substances 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 2
- 238000004891 communication Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000003989 dielectric material Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
Abstract
The present invention is suitable for field of communication technology, provide a kind of coaxial line mode filter that can improve itself higher hamonic wave, it include filter main body and resonance structure, the resonance structure is connected to the input terminal of the filter main body, and the resonance structure is lower than the resonance frequency of frequency corresponding to the lowest order mode harmonic wave that the filter main body itself is formed to generate.Whereby, the present invention enables to low-pass filter to remain to work normally in the frequency range of itself higher hamonic wave.
Description
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of coaxial line style filtering that can improve itself higher hamonic wave
Device.
Background technique
Coaxial line style low-pass filter is usually that cavity body filter is cooperated to use, for inhibiting cavity body filter to generate
Higher mode.Notification number be CN202217757U, in the patent document of entitled " a kind of coaxial low pass filter " public affairs
The coaxial low pass filter Low ESR section middle part of cylinder opened hollows out, and the induction part for being equivalent to capacitor is done greatly, in phase
With under length dimension, this coaxial low pass filter is more preferable to the inhibitory effect of parasitic passband and higher mode.And it is in notification number
CN102610878A, entitled " a kind of coaxial low pass filter " patent document disclosed in on-axis low pass filtering
Device is provided with two limitation of high harmonics cylinders in two joint locations of low-pass filter, finally realizes 6.5 times of octave
Bandwidth, and improve the power capacity and stability of device.
Since the holotype of electromagnetic transmission in coaxial line mode filter is TEM wave (Transverse Electric and
Magnetic Field, a kind of electromagnetic wave of the electric and magnetic fields of electromagnetic wave all in the plane perpendicular to the direction of propagation), but work as
When frequencies of propagation increases, wavelength shortens therewith, and coaxial line cross sectional dimensions and wavelength X can compare, at this point, on coaxial line also
There may be the higher modes of infinite multiple dispersions, including H mode TE wave and transverse magnetic wave TM wave.Wherein lowest order mode is TE11
Wave, corresponding cutoff wavelengthWherein a, b are the low-resistance section radius and low pass of low pass inner conductor respectively
Outer conductor radius；ξrIt is the dielectric constant of heat-shrinkable T bush.That is, coaxial line style low-pass filter itself will appear one at this time
A higher hamonic wave for closing on passband, at the corresponding frequency range of harmonic wave, the filtering performance of low pass is by big heavy discount, so as to cause influence
The rejection of the higher hamonic wave of main body filter (cavity body filter).Most coaxial line style low-pass filters existing at present are all
In the exploitation for emphasizing limitation of high harmonics ability, have plenty of inhibitory effect and improve, has plenty of octave bandwidth and expand, but all
Having ignored a problem --- coaxial line style low-pass filter itself can generate higher hamonic wave, so, what most of patents proposed
The scheme that rejection ability improves does not account for coaxial line mode filter itself higher hamonic wave problem.Such as Fig. 1, if an outer conductor
Diameter is the coaxial line style low-pass filter of 10mm, and low-resistance section inner conductor diameter is 9.5mm, and filling dielectric is normal between internal and external conductor
The polytetrafluoroethylene (PTFE) that number is 2.1, the lowest order mode according to this available specification coaxial low pass filter of above formula are corresponding
Cutoff wavelength, corresponding frequencyThat is height can occur near 6.6G in this specification low-pass filter
Subharmonic, this will affect rejection of the filter near 6.6G.
In summary, existing method is in actual use, it is clear that there is inconvenient and defect, it is therefore necessary to be changed
Into.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide the coaxial line styles that one kind can improve itself higher hamonic wave
Filter enables to low-pass filter to remain to work normally in the frequency range of itself higher hamonic wave.
To achieve the goals above, the present invention provides one kind can improve the coaxial line mode filter of itself higher hamonic wave,
It include filter main body and resonance structure, the resonance structure is connected to the input terminal of the filter main body, the resonance
Structure is lower than the resonance frequency of frequency corresponding to the lowest order mode harmonic wave that the filter main body itself is formed to generate.
According to the coaxial line mode filter for improving itself higher hamonic wave, the inner hollow of the resonance structure,
And the inside of the resonance structure is equipped at least an induction part and transmission line, the company of being equipped between the induction part and the transmission line
Junctor；The induction part connector parallel and described with the inner wall of the resonance structure is vertically connected at the end of the induction part
Portion, the output end of the transmission line are connect with the input terminal of the filter main body.
According to the coaxial line mode filter for improving itself higher hamonic wave, if the resonance frequency is f, thenWherein, C is the equivalent capacity of the resonance structure, and L is the equivalent inductance of resonance structure.
According to the coaxial line mode filter for improving itself higher hamonic wave, the equivalent capacityIts
In, ε is the dielectric constant of filled media inside the resonance structure, and S is that the induction part is right against the resonance structure inner wall
Area, k be electrostatic force constant, d be the induction part at a distance from the resonance structure inner wall.
According to the coaxial line mode filter for improving itself higher hamonic wave, the equivalent inductance and the connector
It is proportional perpendicular to the transverse width of the induction part.
According to the coaxial line mode filter for improving itself higher hamonic wave, the equivalent inductance and the connector
The longitudinal thickness of the induction part is parallel in inverse ratio.
According to the coaxial line mode filter for improving itself higher hamonic wave, the filter main body includes outer leads
Body, inner conductor and the dielectric material being filled between the outer conductor and the inner conductor, the inner conductor are equipped at least one
High impedance section and at least a Low ESR section.
According to the coaxial line mode filter for improving itself higher hamonic wave, the transmission line is connected in described and leads
The input terminal of body.
According to the coaxial line mode filter for improving itself higher hamonic wave, the dielectric material is heat-shrinkable T bush.
The coaxial line mode filter of the present invention for improving itself higher hamonic wave, includes filter main body and resonance
Structure, the resonance structure are connected to the input terminal of the filter main body, and the resonance structure is lower than the filter to generate
The resonance frequency of frequency corresponding to the lowest order mode harmonic wave that wave device main body itself is formed.Whereby, the present invention enables to low pass filtered
Wave device remains to work normally in the frequency range of itself higher hamonic wave.
Detailed description of the invention
Fig. 1 is the test waveform figure of low-pass filter in the prior art；
Fig. 2 is the structural representation that can improve the coaxial line mode filter of itself higher hamonic wave described in the preferred embodiment of the present invention
Figure；
Fig. 3 is the schematic diagram of the resonance structure of the coaxial line mode filter for improving itself higher hamonic wave in Fig. 2；
Fig. 4 is the resonance structure that can improve the coaxial line mode filter of itself higher hamonic wave described in the preferred embodiment of the present invention
Equivalent circuit.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 2 shows the coaxial line mode filters for improving itself higher hamonic wave described in the preferred embodiment of the present invention, including
There are filter main body 100 and resonance structure 200, the resonance structure 200 is connected to the input terminal of filter main body 100, described
Resonance structure 200 is lower than the resonance frequency of frequency corresponding to the lowest order mode harmonic wave that filter main body 100 itself is formed to generate
Rate.Interference of the filter at itself higher hamonic wave is filtered by the resonance frequency, and then guarantees low-pass filter at itself
Preferable inhibitory effect has been remained at higher hamonic wave.
Such as Fig. 3, the inner hollow of the resonance structure 200, and the inside of the resonance structure 200 are equipped at least one induction
Portion 201 and transmission line 203 are equipped with connector 202 between the induction part 201 and transmission line 203；The induction part 201 with it is humorous
The inner wall for structure 200 of shaking is parallel and the connector 202 is vertically connected at the end of induction part 201, the transmission line 203 it is defeated
Outlet is connect with the input terminal of filter main body 100.The resonance structure 200 of the invention is equivalent to one and is connected to the filtering
The lc circuit of device main body 100, such as Fig. 4；The present invention is formed by the resonance structure 200 lower than filter main body 100 itself
Lowest order mode harmonic wave corresponding to a resonance frequency or transmission zero are generated at frequency, reached with this resonance frequency or transmission zero
To the effect for improving low pass rejection.
Particularly, if the resonance frequency is f, thenWherein, C is the equivalent electricity of the resonance structure
Hold, L is the equivalent inductance of resonance structure；Equivalent capacity C and equivalent inductance L therein are respectively the electricity in above-mentioned equivalent lc circuit
Appearance and inductance；The equivalent capacityWherein, ε is the dielectric constant of the 200 inside filled media of resonance structure,
S is that the induction part 201 is right against the area of 200 inner wall of resonance structure, and k is electrostatic force constant, d be the induction part with it is described
The distance of resonance structure inner wall；Its capacitance is bigger, and corresponding resonance frequency is lower, on the contrary then anti-.
The equivalent inductance is proportional perpendicular to the transverse width of the induction part with the connector；The equivalent inductance
The longitudinal thickness of the induction part is parallel in inverse ratio with the connector.The size and connector 202 of its inductance value are in resonance
Transverse width in the cavity of structure 200 is related with longitudinal thickness, and width is wider, and thickness is thinner, and inductance value is bigger, corresponding humorous
Vibration frequency is lower, on the contrary then anti-.
Preferably, the filter main body 100 includes outer conductor, inner conductor and is filled in the outer conductor and institute
The dielectric material between inner conductor is stated, the inner conductor is equipped with an at least high impedance section 102 and an at least Low ESR section 101.Institute
State the input terminal that transmission line 203 is connected to inner conductor；The dielectric material is heat-shrinkable T bush.
Certainly, the resonance structure itself also has lowest order mode harmonic wave, is designed by precalculating with structure, this is tied
The lowest order mode harmonic wave of structure is positioned above the corresponding frequency of harmonic wave of low-pass filter.
In conclusion the coaxial line mode filter of the present invention for improving itself higher hamonic wave, includes filter
Main body and resonance structure, the resonance structure are connected to the input terminal of the filter main body, and the resonance structure is to generate
The resonance frequency of frequency corresponding to the lowest order mode harmonic wave formed lower than the filter main body itself.Whereby, the present invention can
So that low-pass filter remains to work normally in the frequency range of itself higher hamonic wave, solves coaxial line style low-pass filter at itself
The problem of can not work normally when higher mode.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (7)
1. the coaxial line mode filter that one kind can improve itself higher hamonic wave, which is characterized in that include filter main body harmony
Vibration structure, the resonance structure are connected to the input terminal of the filter main body, and the resonance structure is to generate lower than described
The resonance frequency of frequency corresponding to the lowest order mode harmonic wave that filter main body itself is formed；
The inner hollow of the resonance structure, and the inside of the resonance structure is equipped at least an induction part and transmission line, it is described
Connector is equipped between induction part and the transmission line；The induction part connection parallel and described with the inner wall of the resonance structure
Body is vertically connected at the end of the induction part, and the output end of the transmission line is connect with the input terminal of the filter main body；
The filter main body includes outer conductor, inner conductor and Jie being filled between the outer conductor and the inner conductor
Material, the inner conductor are equipped with an at least high impedance section and an at least Low ESR section.
2. the coaxial line mode filter according to claim 1 for improving itself higher hamonic wave, which is characterized in that set described
Resonance frequency is f, thenWherein, C is the equivalent capacity of the resonance structure, and L is the equivalent electricity of resonance structure
Sense.
3. the coaxial line mode filter according to claim 2 for improving itself higher hamonic wave, which is characterized in that described etc.
Imitate capacitorWherein, ε is the dielectric constant of filled media inside the resonance structure, and S is the induction part face
In the area of the resonance structure inner wall, k is electrostatic force constant, and d is the induction part at a distance from the resonance structure inner wall.
4. the coaxial line mode filter according to claim 2 for improving itself higher hamonic wave, which is characterized in that described etc.
It imitates inductance and the connector is proportional perpendicular to the transverse width of the induction part.
5. the coaxial line mode filter according to claim 2 for improving itself higher hamonic wave, which is characterized in that described etc.
Effect inductance and the connector are parallel to the longitudinal thickness of the induction part in inverse ratio.
6. the coaxial line mode filter according to claim 1 for improving itself higher hamonic wave, which is characterized in that the biography
Defeated line is connected to the input terminal of the inner conductor.
7. the coaxial line mode filter according to claim 1 for improving itself higher hamonic wave, which is characterized in that given an account of
Material is heat-shrinkable T bush.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810150772.1A CN108493542B (en) | 2018-02-13 | 2018-02-13 | A kind of coaxial line mode filter improving itself higher hamonic wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810150772.1A CN108493542B (en) | 2018-02-13 | 2018-02-13 | A kind of coaxial line mode filter improving itself higher hamonic wave |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108493542A CN108493542A (en) | 2018-09-04 |
| CN108493542B true CN108493542B (en) | 2019-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810150772.1A Active CN108493542B (en) | 2018-02-13 | 2018-02-13 | A kind of coaxial line mode filter improving itself higher hamonic wave |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3600711A (en) * | 1969-08-13 | 1971-08-17 | Varian Associates | Coaxial filter having harmonic reflective and absorptive means |
| JP2001332904A (en) * | 2000-05-24 | 2001-11-30 | Nec Corp | Filter structure |
| CN101931113B (en) * | 2009-06-25 | 2013-01-23 | 泰科电子(上海)有限公司 | Low-pass filter |
| DE102010027251B4 (en) * | 2010-07-15 | 2019-12-05 | Spinner Gmbh | Koaxialleiterstruktur |
| CN202042577U (en) * | 2011-05-18 | 2011-11-16 | 摩比天线技术（深圳）有限公司 | Low-pass filter structure |
| CN102610878B (en) * | 2011-09-30 | 2014-06-18 | 电子科技大学 | Coaxial low-pass filter |
-
2018
- 2018-02-13 CN CN201810150772.1A patent/CN108493542B/en active Active
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