CN104617362B - Low pass filter with transmission zero - Google Patents
Low pass filter with transmission zero Download PDFInfo
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- CN104617362B CN104617362B CN201510049754.0A CN201510049754A CN104617362B CN 104617362 B CN104617362 B CN 104617362B CN 201510049754 A CN201510049754 A CN 201510049754A CN 104617362 B CN104617362 B CN 104617362B
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- pass filter
- low pass
- ground connection
- conductor portion
- high impedance
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Abstract
The invention discloses a kind of low pass filter with transmission zero, including signal conductor, ground connection cavity, open-circuit line and the ground connection cylinder with bottom wall, signal conductor is coaxial to be arranged in grounded chamber body, and signal conductor includes multiple alternately the low-impedance conductor portion of connection and high impedance conductor portions, ground connection cavity offers an opening in opening position corresponding with a wherein high impedance conductor portion, open-circuit line is fixedly connected by opening with the high impedance conductor portion positioned at opening, and open-circuit line be located at the external part of grounded chamber end be arranged at ground connection cylinder in.Compared with prior art, the low pass filter that the present invention has transmission zero produces a transmission zero by setting open-circuit line and being fixedly connected with open-circuit line with the wherein high impedance conductor portion on signal conductor to realize, so as to significantly improve suppression of the low pass filter to high-frequency signal, without the length of low pass filter to be increased or the diameter of increase low-impedance line.
Description
Technical field
The present invention relates to coaxial low-pass filter technical field, more particularly relates to a kind of low pass with transmission zero
Wave filter.
Background technology
Coaxial low-pass filter of the prior art, its model is as shown in figure 5, wherein thin inner wire (diameter is small)
Or high impedance line, it can be equivalent to the inductance of series connection, thick inner wire (diameter is big) or low-impedance line, and it can wait
The electric capacity for parallel connection is imitated, is changed by the alternating of coaxial inner conductor diameter, realizes LPF performance.However, Fig. 5 institutes
Show that coaxial low-pass filter has poor high-frequency suppressing characteristic.Fig. 6 is refer to, curve A is that coaxial line is low in Fig. 5 in Fig. 6
The transmission amplitude-versus-frequency curve of bandpass filter, as shown in fig. 6, the signal less than a certain frequency (low-pass cut-off frequencies) can smoothly lead to
Cross coaxial low-pass filter, and with the rise of frequency, its decay can be increasing higher than the signals of low-pass cut-off frequencies.Transmission
Zero point refers to that signal occurs being mutated and the obvious frequency of attenuation amplitude, and low pass filter pair can be significantly improved by transmission zero
The dough softening of high-frequency signal.
But transmission zero is not present on the amplitude-versus-frequency curve of coaxial low-pass filter of the prior art, and be higher than
The attenuation amplitude of the signal of low-pass cut-off frequencies is more gentle, it is impossible to reaches preferable high-frequency suppressing characteristic.And in order to realize compared with
Good high-frequency suppressing characteristic, i.e., in order that amplitude-versus-frequency curve is more precipitous, it is necessary to increase the joint number (low pass filtered of low pass filter
The length of ripple device) or increase low-impedance line diameter, then the above method can cause that the size of low pass filter is larger, cost
It is higher.
The content of the invention
It is an object of the invention to provide a kind of low pass filter with transmission zero, to realize preferable high frequency suppression
Reduce the size and production cost of low pass filter while characteristic processed.
To achieve the above object, the invention provides a kind of low pass filter with transmission zero, including signal conductor,
Ground connection cavity, open-circuit line and the ground connection cylinder with bottom wall with circular hollow inner chamber, the signal conductor is coaxial to be set
Intracavitary in the circular hollow is placed in, and the signal conductor includes multiple alternately the low-impedance conductor portion of connection and high impedances and led
Body portion, the ground connection cavity offer an opening, the open circuit in opening position corresponding with the wherein one high impedance conductor portion
Line is fixedly connected by the opening with the high impedance conductor portion positioned at the opening, and the open-circuit line is located at institute
The end for stating the external part of grounded chamber is arranged in the ground connection cylinder.
Compared with prior art, the present invention has the low pass filter of transmission zero by setting open-circuit line and by open-circuit line
It is fixedly connected with the wherein high impedance conductor portion on signal conductor and realizes and produce a transmission zero, i.e., higher than low pass filtered
The high band of the low-pass cut-off frequencies of ripple device produces a transmission zero, so as to significantly improve suppression of the low pass filter to high-frequency signal
System, without the length of low pass filter to be increased or the diameter of increase low-impedance line, that is, realizing same high-frequency suppressing
In the case of characteristic, low pass filter is smaller in the present invention, and production cost is lower.
It is preferred that the open-circuit line includes being fixedly connected with the high impedance conductor portion and perpendicular to the high impedance conductor
The vertical section in portion and it is connected with the vertical section and spiral supporting part, the supporting part are arranged at the ground connection cylinder
It is interior.
It is preferred that the length of the vertical section is more than the half in the external footpath of the grounded chamber.
It is preferred that the vertical section welds with the high impedance conductor portion.
It is preferred that the split ring encloses around the ground connection cavity one and the ground connection cavity is divided into two.
It is preferred that the length for the high impedance conductor portion being connected with the open-circuit line is more than remaining described high impedance conductor
The length in portion.
It is preferred that the signal conductor includes N number of low-impedance conductor portion and the N+1 high impedance conductor portions, institute
State open-circuit line to be connected with the high impedance conductor portion of the signal conductor middle position, wherein N is even number.
It is preferred that the low pass filter is fixedly installed in an elongate slots, the bottom wall of the elongate slots connects with described
Groove of the opening position depression corresponding to ground cylinder formed with an accommodating ground connection cylinder.
It is preferred that the low pass filter also includes input terminal, lead-out terminal, input connector and output connection
Device, the input connector are connected by the input terminal with one end of the signal conductor, and the out connector passes through
The lead-out terminal is connected with the other end of the signal conductor.
It is preferred that the ground connection cavity is polytetrafluoroethylene (PTFE) cavity, the ground connection cylinder is polytetrafluoroethylene (PTFE) cylinder.
It will be become more fully apparent by following description and with reference to accompanying drawing, the present invention, these accompanying drawings are used to explain the present invention
Embodiment.
Brief description of the drawings
Fig. 1 is the overall structure figure for the embodiment of low pass filter one that the present invention has transmission zero.
Fig. 2 is to have the low pass filter of transmission zero and the structure chart after elongate slots assembling in Fig. 1.
Fig. 3 is exploded view of the low pass filter with long row groove for having in Fig. 2 transmission zero.
Fig. 4 is the low pass filter and profile of the elongate slots along A-A directions for having in Fig. 2 transmission zero.
Fig. 5 is the structure chart of coaxial low-pass filter in the prior art.
Fig. 6 amplitude-versus-frequency curve figures of low pass filter for the present invention and in the prior art.
Embodiment
Embodiments of the invention are described with reference now to accompanying drawing, similar element numbers represent similar element in accompanying drawing.
Fig. 1 to Fig. 4 is refer to, the invention provides a kind of low pass filter 100 with transmission zero, it includes signal
Conductor 11, ground connection cavity 12, open-circuit line 13 and the ground connection cylinder 14 with bottom wall with circular hollow inner chamber, signal conductor
11 coaxial being arranged at are grounded intracavitary in the circular hollow of cavity 12, and signal conductor 11 includes the Low ESRs of multiple alternately connections
Conductor portion 111 and high impedance conductor portion 112, ground connection cavity 12 are opened with 112 corresponding opening position of a wherein high impedance conductor portion
Provided with an opening 121, open-circuit line 13 is fixedly connected by opening 121 with the high impedance conductor portion 112 at opening 121,
And the end of part of the open-circuit line 13 outside ground connection cavity 12 is arranged in ground connection cylinder 14.
Compared with prior art, the present invention has the low pass filter 100 of transmission zero by setting open-circuit line 13, and will
Open-circuit line 13 is fixedly connected with the wherein high impedance conductor portion 112 on signal conductor 11 and realizes and produce a transmission zero,
A transmission zero is produced in the high band of the low-pass cut-off frequencies higher than low pass filter 100, so as to significantly improve low pass filtered
Suppression of the ripple device to high-frequency signal, without the length of low pass filter to be increased or the diameter of increase low-impedance line, that is, exist
In the case of realizing same high-frequency suppressing characteristic, low pass filter is smaller in the present invention, and production cost is lower.
Specifically, as shown in Figure 3 to Figure 4, open-circuit line 13 includes being fixedly connected with high impedance conductor portion 112 and perpendicular to height
The vertical section 131 of impedance conductor portion 112 and it is connected with vertical section 131 and spiral supporting part 133, supporting part 133 are set
It is placed in ground connection cylinder 14.Preferably, it is the cylindrical tube with bottom wall to be grounded cylinder 14；The length of vertical section 131 is more than
The half of the external diameter of cavity 12 is grounded, so as to which vertical section 131 stretches out the outer segment distance of ground connection cavity 12.In addition, vertical section 131
It is fixedly connected with high impedance conductor portion 112, it is preferred that vertical section 131 is fixed with high impedance conductor portion 112 with welding manner to be connected
Connect, the two, which otherwise achieves a fixed connection, certainly also may be used.
Refer to Fig. 3 again, be opened in the present embodiment ground connection cavity 12 on opening 121 around ground connection cavity 12 1 circle and
Ground connection cavity 12 is divided into two, is such as divided into two parts 121 and 123, specifically, opening 121 is a cylinder v notch v.Certainly,
In other embodiments, the structure of ground connection cavity 12 in the present invention, and opening 121 can also be realized by two ground connection cavitys
Structure be also not restricted to this, opening 121 be used for allow open-circuit line 13 through ground connection cavity 12 and with one on signal conductor 11
High impedance conductor portion 112 is connected to produce a transmission zero, therefore can realize that the opening 121 of any structure of the function belongs to
In scope of the present invention.In addition, ground connection cavity 12 is polytetrafluoroethylene (PTFE) (PTFE) cavity, ground connection cylinder 14 is poly-
Tetrafluoroethene cylinder, signal conductor 11 and open-circuit line 13 are metal material, the silver-plated material of such as copper.
In addition, signal conductor 11 includes N number of low-impedance conductor portion 111 and N+1 high impedance conductor portion in the present embodiment
112, and low-impedance conductor portion 111 and high impedance conductor portion 112 are in cylinder, and the diameter in low-impedance conductor portion 111 is more than height
The diameter in low-impedance conductor portion 112, the length in low-impedance conductor portion 111 are less than the length of high impedance conductor portion 112, and wherein N is
Even number, such as N=2,4,6,8, simultaneously because low-impedance conductor portion 111 and high impedance conductor portion 112 alternately connect, therefore signal
The both ends of conductor 11 are low-impedance conductor portion 111, and the middle position of signal conductor 11 corresponds to a high impedance conductor portion
112.And opening 121 can be arranged on ground connection cavity 12 and any 112 corresponding opening position of high impedance conductor portion.Preferably,
Opening 121 is arranged at the middle position of ground connection cavity 12, that is, be open 121 position and the height of the middle position of signal conductor 11
The position correspondence of impedance conductor portion 112, so as to which open-circuit line 13 and the high impedance conductor portion 112 of middle position on signal conductor 11 connect
Connect.In order to realize that conveniently, the length for the high impedance conductor portion 112 being connected with open-circuit line 13 is more than remaining high impedance conductor portion 112
Length.
Fig. 6 is refer to again, and curve B is special for the amplitude-frequency of Fig. 1 low pass filters 100 with transmission zero into Fig. 4 in Fig. 6
Linearity curve figure, the frequency O (frequency i.e. on curve B corresponding to point O) wherein on curve B is transmission zero, when signal frequency height
When low-pass cut-off frequencies, signal amplitude is decayed, and signal amplitude decays significantly at frequency O, the amplitude versus frequency characte of signal
Curve is more precipitous so that can not be broadened by the frequency range of low pass filter 100, that is, it is special to realize preferable high-frequency suppressing
Property.It should be noted that the length of open-circuit line 13 can influence the attenuation degree of the amplitude-versus-frequency curve of low pass filter 100, tool
Body, when the length of open-circuit line 13 increases, transmission zero is offset to the left on amplitude-versus-frequency curve figure, low pass filter 100
High-frequency suppressing characteristic improves, conversely, when the length of open-circuit line 13 reduces, transmission zero is on amplitude-versus-frequency curve figure to right avertence
Move, the high-frequency suppressing characteristic of low pass filter 100 is deteriorated, so as to realize one by designing open-circuit line 13 to be suitably sized
Fixed high-frequency suppressing characteristic.Certainly, also need to consider other factors during the length for designing open-circuit line 13.
In addition, as shown in Figures 2 to 4, low pass filter 100 of the present invention also includes input terminal 15, lead-out terminal 16, defeated
Entering connector 17 and out connector 18, input connector 17 is connected by input terminal 15 with one end of signal conductor 11,
Out connector 18 is connected by lead-out terminal 16 with the other end of signal conductor 11, input of the signal from low pass filter 100
End input, exported after filtered by the output end of low pass filter 100, it is achieved thereby that by low frequency signal and suppressing high frequency letter
Number.In addition, low pass filter 100 of the present invention is fixedly installed in an elongate slots 20, the bottom wall of elongate slots 20 is with being grounded cylinder
Groove 201 of the opening position depression corresponding to 14 formed with an accommodating ground connection cylinder, and opened respectively on the two opposite sides of elongate slots 20
Through hole provided with installation input connector 17 and out connector 18.
Above in association with most preferred embodiment, invention has been described, but the invention is not limited in implementation disclosed above
Example, and modification, equivalent combinations that the various essence according to the present invention are carried out should be covered.
Claims (9)
1. a kind of low pass filter with transmission zero, including signal conductor and the ground connection cavity with circular hollow inner chamber,
The signal conductor it is coaxial be arranged at intracavitary in the circular hollow, and the signal conductor includes the low of multiple alternately connections
Impedance conductor portion and high impedance conductor portion, it is characterised in that the low pass filter also includes open-circuit line and has bottom wall
Cylinder is grounded, the ground connection cavity offers an opening in opening position corresponding with the wherein one high impedance conductor portion, described
Open-circuit line is fixedly connected by the opening with the high impedance conductor portion positioned at the opening, and the open-circuit line position
It is arranged in the end of the external part of the grounded chamber in the ground connection cylinder, the open-circuit line includes leading with the high impedance
Body portion is fixedly connected and the vertical section perpendicular to the high impedance conductor portion and is connected with the vertical section and spiral
Supporting part, the supporting part are arranged in the ground connection cylinder.
2. there is the low pass filter of transmission zero as claimed in claim 1, it is characterised in that the length of the vertical section is big
Half in the external footpath of the grounded chamber.
3. there is the low pass filter of transmission zero as claimed in claim 1, it is characterised in that the vertical section and the height
Impedance conductor portion is welded.
4. the low pass filter with transmission zero as described in any one of claims 1 to 3, it is characterised in that the opening
Enclosed around the ground connection cavity one and the ground connection cavity is divided into two.
5. there is the low pass filter of transmission zero as claimed in claim 4, it is characterised in that be connected with the open-circuit line
The length of the high impedance conductor portion is more than the length of remaining high impedance conductor portion.
6. there is the low pass filter of transmission zero as claimed in claim 4, it is characterised in that the signal conductor includes N
The individual low-impedance conductor portion and the N+1 high impedance conductor portions, the open-circuit line and the signal conductor middle position
The high impedance conductor portion connection, wherein N is even number.
7. there is the low pass filter of transmission zero as claimed in claim 1, it is characterised in that the low pass filter is fixed
It is arranged in an elongate slots, the bottom wall of the elongate slots is accommodating formed with one in opening position depression corresponding with the ground connection cylinder
The groove of the ground connection cylinder.
8. there is the low pass filter of transmission zero as claimed in claim 1, it is characterised in that the low pass filter also wraps
Include input terminal, lead-out terminal, input connector and out connector, the input connector by the input terminal with
One end connection of the signal conductor, the out connector are connected by the other end of the lead-out terminal and the signal conductor
Connect.
9. there is the low pass filter of transmission zero as claimed in claim 1, it is characterised in that the ground connection cavity is poly- four
PVF cavity, the ground connection cylinder is polytetrafluoroethylene (PTFE) cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049754.0A CN104617362B (en) | 2015-01-30 | 2015-01-30 | Low pass filter with transmission zero |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049754.0A CN104617362B (en) | 2015-01-30 | 2015-01-30 | Low pass filter with transmission zero |
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| Publication Number | Publication Date |
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| CN104617362A CN104617362A (en) | 2015-05-13 |
| CN104617362B true CN104617362B (en) | 2017-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510049754.0A Active CN104617362B (en) | 2015-01-30 | 2015-01-30 | Low pass filter with transmission zero |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2803975C1 (en) * | 2023-05-18 | 2023-09-25 | Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный электротехнический университет "ЛЭТИ" им. В.И. Ульянова (Ленина)" | Probe for measuring dielectric constant of dielectric plates using microwave spectroscopy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311197A (en) * | 2019-07-16 | 2019-10-08 | 深圳市威富通讯技术有限公司 | Low-pass filter with transmission zero |
| CN113193315B (en) * | 2021-04-29 | 2022-05-20 | 中航光电科技股份有限公司 | Whole machine solderless low pass filter |
| CN114243237B (en) * | 2021-12-20 | 2023-04-11 | 大富科技(安徽)股份有限公司 | Low-pass filtering structure and filter |
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| JPH07154101A (en) * | 1993-11-26 | 1995-06-16 | Nec Eng Ltd | Low pass filter |
| CN1288597A (en) * | 1998-11-12 | 2001-03-21 | 三菱电机株式会社 | Low-pass filter |
| CN101630765A (en) * | 2009-08-25 | 2010-01-20 | 华为技术有限公司 | Coaxial low-pass filter and amplitude-frequency characteristic improving method |
| CN202217767U (en) * | 2011-08-16 | 2012-05-09 | 武汉凡谷电子技术股份有限公司 | Low-pass filter with transmission zero |
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| CN204481103U (en) * | 2015-01-30 | 2015-07-15 | 东莞鸿爱斯通信科技有限公司 | There is the low pass filter of transmission zero |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3484661B2 (en) * | 1996-03-08 | 2004-01-06 | 日本電気エンジニアリング株式会社 | Coaxial low-pass filter |
| JP2004282573A (en) * | 2003-03-18 | 2004-10-07 | Nec Corp | Low-pass filter |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07154101A (en) * | 1993-11-26 | 1995-06-16 | Nec Eng Ltd | Low pass filter |
| CN1288597A (en) * | 1998-11-12 | 2001-03-21 | 三菱电机株式会社 | Low-pass filter |
| CN101630765A (en) * | 2009-08-25 | 2010-01-20 | 华为技术有限公司 | Coaxial low-pass filter and amplitude-frequency characteristic improving method |
| CN202217767U (en) * | 2011-08-16 | 2012-05-09 | 武汉凡谷电子技术股份有限公司 | Low-pass filter with transmission zero |
| CN203300776U (en) * | 2013-05-06 | 2013-11-20 | 京信通信技术(广州)有限公司 | Communication cavity device and low-pass filtering path |
| CN204481103U (en) * | 2015-01-30 | 2015-07-15 | 东莞鸿爱斯通信科技有限公司 | There is the low pass filter of transmission zero |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2803975C1 (en) * | 2023-05-18 | 2023-09-25 | Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный электротехнический университет "ЛЭТИ" им. В.И. Ульянова (Ленина)" | Probe for measuring dielectric constant of dielectric plates using microwave spectroscopy |
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