CN203787540U - Coaxial low pass filter - Google Patents
Coaxial low pass filter Download PDFInfo
- Publication number
- CN203787540U CN203787540U CN201320877645.4U CN201320877645U CN203787540U CN 203787540 U CN203787540 U CN 203787540U CN 201320877645 U CN201320877645 U CN 201320877645U CN 203787540 U CN203787540 U CN 203787540U
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- CN
- China
- Prior art keywords
- pass filter
- low pass
- metallic conductor
- coaxial low
- coaxial
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- 239000004020 conductor Substances 0.000 claims abstract description 34
- 239000004033 plastic Substances 0.000 claims abstract description 21
- 229920003023 plastic Polymers 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims description 22
- 239000004809 Teflon Substances 0.000 claims description 10
- 229920006362 Teflon® Polymers 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 240000009087 Crescentia cujete Species 0.000 description 1
- 235000005983 Crescentia cujete Nutrition 0.000 description 1
- 235000009797 Lagenaria vulgaris Nutrition 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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Abstract
The utility model relates to the communication field, and provides a coaxial low pass filter comprising a metal conductor; the metal conductor comprises a plurality of low-impedance capacitor structures and a plurality of high-impedance inductor structures arranged in a series staggering manner at intervals; the thickness of the capacitor structure gradually increases from two ends of the conductor to a middle portion; the metal conductor is wrapped by a plastic layer; a cross section in an axial vertical surface direction of the low-impedance capacitor structure is in a flat shape; therefore, the coaxial low pass filter is compact in structure, can be freely selected to be placed in vertical or horizontal direction in the low pass filter.
Description
Technical field
The utility model relates to communication technical field, relates in particular to a kind of coaxial low pass filter.
Background technology
In microwave communication industry, a lot of occasions (especially base station antenna feeder unit) need to be used low pass filter (Low Pass Filter is called for short LPF) as the device of high-frequency suppressing.The version cross sectional shape that this LPF as high-frequency suppressing adopts is conventionally circular or foursquare version.
Traditional circular or foursquare structure has its advantage, as simple in structure, implement very convenient, cost lower (only circular form), but also there is its shortcoming, as larger in volume, need to take in filter the inside larger area, at antenna feeder filter product index nowadays, be more and more tending towards today of theoretical value, the volume that reduces the unit except band pass filter is very meaningful and be necessary a very much job, and these unit comprise LPF, COUPLER(coupler) etc.
In summary, in actual use, obviously there is inconvenience and defect in prior art, so be necessary to be improved.
Utility model content
For above-mentioned defect, it is a kind of that the purpose of this utility model is to provide, the LPF volume that overcomes above-mentioned existing circle or foursquare version is larger, need to take in filter the inside the defect of larger area, a kind of compact conformation is provided, can freely select vertical or level to take filter volume, thereby reach the object of optimization filter construction.
To achieve these goals, the utility model provides a kind of coaxial low pass filter, it is characterized in that, comprising:
A metallic conductor, described metallic conductor comprises a plurality of low-impedance capacitance structure of staggered interval serial connection setting and the induction structure of a plurality of high impedances, the thickness of described capacitance structure is increased progressively to centre by described metallic conductor two ends, the coated outside of described metallic conductor plastic layer, and the cross section of the axial vertical plane direction of described low-impedance capacitor structure is flat pattern.
According to coaxial low pass filter described in the utility model, described cross section is rectangle.
According to coaxial low pass filter described in the utility model, the narrow hem width degree described in described metallic conductor encapsulated by structures after plastic layer is less than and/or equals 3.7mm.
According to coaxial low pass filter described in the utility model, the diameter of described induction structure is 0.6mm～1.5mm.
According to coaxial low pass filter described in the utility model, described plastic layer is Teflon.
According to coaxial low pass filter described in the utility model, the thickness of described Teflon plastic construction is 0.1mm～0.5mm.
According to coaxial low pass filter described in the utility model, the diameter of the output port at the two ends of described metallic conductor and the metal bar of input port is between the described narrow hem width degree and the diameter of described induction structure of described capacitance structure.
According to coaxial low pass filter described in the utility model, the described capacitance structure at the described output port of described metallic conductor and described input port place is thin plate, and is coated in described plastic layer.
The utility model is by being designed to the LPF of super flat sugarcoated haws structure, comprise a metallic conductor, this is that the staggered interval of induction structure serial connection by the high impedance of one group of super flat low-impedance capacitor structure in cross section and circular thin diameter forms with metallic conductor, simultaneously completely in the outside of this root metallic conductor structure is wrapped in the Teflon plastic construction that one deck is very thin.
Accompanying drawing explanation
Figure 1A is the vertical view of the structural representation of the utility model coaxial low pass filter;
Figure 1B is the front view of the structural representation of the utility model coaxial low pass filter;
Fig. 1 C is the left view of the structural representation of the utility model coaxial low pass filter;
Fig. 2 is one of frequency response schematic diagram of the utility model coaxial low pass filter;
Fig. 3 is that the frequency of the utility model coaxial low pass filter responds two of schematic diagram.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The LPF volume that overcomes above-mentioned existing circle or foursquare version is larger, need to take in filter the inside the defect of larger area, a kind of compact conformation is provided, can freely selects vertical or level to take filter volume, thereby reach the object of optimization filter construction.
As shown in Figure 1A to Fig. 1 C, the utility model provides a kind of coaxial low pass filter, comprise: a metallic conductor 100, metallic conductor 100 comprises a plurality of low-impedance capacitance structure 20 of staggered interval serial connection setting and the induction structure 30 of a plurality of high impedances, the thickness of capacitance structure 20 is increased progressively to centre by metallic conductor 100 two ends, the coated outside of metallic conductor 100 plastic layer, and the cross section of low-impedance capacitor structure 20 is flat patterns.In Fig. 1 C, it is rectangle, but the utility model is not limited to rectangle, or other flat pattern, as arc, arc, wherein described in this figure, two of cross section narrow hem width degree approach the diameter of induction structure 30, but depend on medium frequency while specifically implementing, get over Gao Yuebian, be likely less than the diameter of induction structure 30.Also need to coordinate in actual use the tube chamber of correspondingly-sized, be contained in wherein, selection level or vertical placement.
Described cross section is the axial vertical plane direction of metallic conductor 100.When reducing area of section, suitably adjust the thickness of capacitance structure 20.The two narrow hem width degree in the described cross section described in metallic conductor 100 encapsulated by structures after plastic layer are less than and/or equal 3.7mm, wrapping portion looks like a cuboid in appearance, in Figure 1B, what show is to have minimum narrow hem width degree, the thickness that does not show capacitance structure, the external diameter on upper and lower both sides is 3.7mm.
Preferably, the diameter of induction structure 30 is 0.6mm～1.5mm to the utility model, and as shown in the figure, the diameter of induction structure 30 is less than capacitance structure 20.Accordingly, the cross section of described capacitance structure 20 also needs to approach this size, minimizes the area in cross section.
Further, the described plastic layer that is wrapped in the calabash bunch that capacitance structure 20 and induction structure 30 form is Teflon.Be different from prior art, use Teflon plastics to improve the outside insulation characterisitic of low pass filter, the thickness of described Teflon plastic construction is 0.1mm～0.5mm.In Fig. 1 C, long limit is because wrapped up described Teflon plastic construction, and external diameter reaches 9.9mm, and minor face comprises that this structure external diameter reaches 3.7mm.
Preferably the diameter of the output port at the two ends of metallic conductor 100 and the metal bar of input port is between the described narrow hem width degree and the diameter of induction structure 30 of capacitance structure 20, and numerical value can be 2mm.The capacitance structure 20 at described output port and described input port place is thin plate, and is coated in described plastic layer.Since the low pass filter forming with lc circuit on the other hand, the volume of inductance value and circuit is generally all larger, but frequency can be accomplished miniaturization when megahertz is above, with practical value.
One embodiment of the invention is preferred, coaxial low pass filter comprises a metallic conductor 100, metallic conductor 100 comprises that the staggered interval of induction structure 30 serial connection of one group of low-impedance capacitance structure 20 and high impedance forms, and metallic conductor 100 is by inductance and the staggered serial connection of capacitance structure 20 of whole thin circle; The plastic layer being wrapped in prevents that internal structure is connected with the metal shell of filter.Be different from prior art, what the cross section of capacitance structure 20 adopted is rectangle, and size is dwindled, and is spaced with induction structure 30 high impedance part and the Low ESR part that forms low pass filter, forms 1 rank of low pass filter, generally elects 3～5 rank as.Every joint inductive length is adjusted as required, the external diameter of low pass filter can be dropped to 3.7mm left and right.Capacitance structure 20 becomes cuboid.Owing to being subject to the impact of amplifier frequency characteristic and parasitic capacitance, when making the junction of capacitance structure 20 and induction structure 30, must note some processing.
In this preferred embodiment, each section of high impedance induction structure 30 need to be selected suitable metal equally, can be copper, its connecting axle and low-impedance capacitance structure 20 share, for extending to form of the inner wire of capacitance structure 20, be that each section of capacitance structure 20 and induction structure 30 can share a connecting axle, the connecting axle that is wherein positioned at the induction structure 30 of high impedance is exactly the inner wire of this induction structure 30, comprises the sheet metal that is set in connecting axle 40 that is connected to input port and output port.As shown in Figure 1A, Figure 1B, Fig. 1 C, the vertical view of the utility model coaxial low pass filter, front view, left view,
The high frequency band rejection that improves low pass filter, need to suppress the higher mode in capacitance structure 20.As shown in Figures 2 and 3, the utility model coaxial low pass filter is in the response condition of each frequency, the in the situation that of equal length, different from the coaxial low pass filter of prior art performance during far-end high order harmonic component outside suppressing passband, coaxial low pass filter described in the utility model after flattening design can reach 70.519dB, visible the in the situation that of equal length size restrictions, coaxial low pass filter described in the utility model is fine to the inhibition of parasitic passband and higher mode.
In sum, the utility model is designed to sugarcoated haws structure LPF by super flattening, comprise a metallic conductor, this is that the staggered interval of induction structure serial connection by the high impedance of one group of super flat low-impedance capacitor structure in cross section and circular thin diameter forms with metallic conductor, simultaneously completely in the outside of this root metallic conductor structure be wrapped in the Teflon plastic construction that one deck is very thin, compact conformation, can freely select vertical or level to take filter volume, thereby reach the object of optimization filter construction.
Certainly; the utility model also can have other various embodiments; in the situation that not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (8)
1. a coaxial low pass filter, is characterized in that, comprising:
A metallic conductor, described metallic conductor comprises a plurality of low-impedance capacitance structure of staggered interval serial connection setting and the induction structure of a plurality of high impedances, the thickness of described capacitance structure is increased progressively to centre by described metallic conductor two ends, the coated outside of described metallic conductor plastic layer, and the cross section of the axial vertical plane direction of described low-impedance capacitor structure is flat pattern.
2. coaxial low pass filter according to claim 1, is characterized in that, described cross section is rectangle.
3. coaxial low pass filter according to claim 2, is characterized in that, the two narrow hem width degree in the described cross section described in described metallic conductor encapsulated by structures after plastic layer are less than and/or equal 3.7mm.
4. coaxial low pass filter according to claim 3, is characterized in that, the diameter of described induction structure is 0.6mm～1.5mm.
5. coaxial low pass filter according to claim 1, is characterized in that, described plastic layer is Teflon.
6. coaxial low pass filter according to claim 5, is characterized in that, the thickness of described Teflon plastic construction is 0.1mm～0.5mm.
7. coaxial low pass filter according to claim 3, is characterized in that, the diameter of the output port at the two ends of described metallic conductor and the metal bar of input port is between the described narrow hem width degree and the diameter of described induction structure of described capacitance structure.
8. coaxial low pass filter according to claim 7, is characterized in that, the described capacitance structure at the described output port of described metallic conductor and described input port place is thin plate, and is coated in described plastic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877645.4U CN203787540U (en) | 2013-12-27 | 2013-12-27 | Coaxial low pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877645.4U CN203787540U (en) | 2013-12-27 | 2013-12-27 | Coaxial low pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203787540U true CN203787540U (en) | 2014-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320877645.4U Expired - Fee Related CN203787540U (en) | 2013-12-27 | 2013-12-27 | Coaxial low pass filter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203787540U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577276A (en) * | 2015-02-10 | 2015-04-29 | 深圳三星通信技术研究有限公司 | Integrated low-pass hard link structure and cavity filter |
| CN111194505A (en) * | 2017-08-18 | 2020-05-22 | 阿维科斯公司 | Coaxial RF filter with discoidal capacitor |
-
2013
- 2013-12-27 CN CN201320877645.4U patent/CN203787540U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577276A (en) * | 2015-02-10 | 2015-04-29 | 深圳三星通信技术研究有限公司 | Integrated low-pass hard link structure and cavity filter |
| CN104577276B (en) * | 2015-02-10 | 2017-05-10 | 深圳三星通信技术研究有限公司 | Integrated low-pass hard link structure and cavity filter |
| CN111194505A (en) * | 2017-08-18 | 2020-05-22 | 阿维科斯公司 | Coaxial RF filter with discoidal capacitor |
| EP3669419A4 (en) * | 2017-08-18 | 2021-04-28 | AVX Corporation | Coaxial rf filter with discoidal capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20201227 |