CN103337681A - Ground current isolator for radio frequency signals - Google Patents
Ground current isolator for radio frequency signals Download PDFInfo
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- CN103337681A CN103337681A CN2012104094526A CN201210409452A CN103337681A CN 103337681 A CN103337681 A CN 103337681A CN 2012104094526 A CN2012104094526 A CN 2012104094526A CN 201210409452 A CN201210409452 A CN 201210409452A CN 103337681 A CN103337681 A CN 103337681A
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Abstract
The invention relates to an isolator which obstructs DC signals and low-frequency signals and allows passing of radio frequency signals. The ground current isolator of the radio frequency signals comprises a first coaxial connector and a second coaxial connector which are connected with each other. A first insulator of the first coaxial connector is located in a first shielding layer, and a second insulator of the second coaxial connector is located in a second shielding layer. One end of the second shielding layer has an intersected superposed segment with the first shielding layer. The superposed segment between the first shielding layer and the second shielding layer is provided with a clearance which is internally provided with a conductive medium layer. The ground current isolator for the radio frequency signals provided by the invention is simple in structure simple in assembly process, high in production efficiency and low in cost. The ground current isolator settles the technical problems in the prior-art isolator such as complicated structure, difficult assembling process, high precision requirement, low production efficiency and higher cost.
Description
Technical field
The present invention relates to a kind of electronic component, relate in particular to a kind of the have direct current of obstruct and low frequency signal, by the isolator of radiofrequency signal.
Background technology
Cable TV network links together set-top box or the television set of every household by cable, between each user, between user and the CATV transmission equipment, may exist earthy inconsistent, can in cable, produce earth-return circulation, cause the cable heating, device damage may cause fire when serious.
Use radiofrequency signal earth-return isolator (hereinafter to be referred as isolator), can cut off the grounded circuit electric current, the accident that prevents takes place.This type of isolator is realized by 2 coaxial connectors and several electric capacity usually, is connected by electric capacity between the ground of two coaxial connectors.Hundreds of electric capacity to thousands of pF are Low ESR to the 48MHz-950MHz cable TV signal, but to direct current and low frequency, especially the signal of 50Hz or 60Hz is high impedance, prevents that the AC network potential difference from producing the earth-return electric current in the CATV-cable network network.
Usually only the screen of cable of cable TV need be isolated and to prevent that the earth-return electric current from producing.Therefore isolator only seals in electric capacity at screen.The Isolated Shield layer, heart yearn leads directly to, and this type of isolator is commonly referred to as single isolator.
For guaranteeing better safe effect, also can seal in electric capacity at heart yearn, so heart yearn and screen are all isolated, be called two isolators.
The isolation of heart yearn only needs an electric capacity.The isolation relative complex of screen.For obtaining low insertion loss, the isolation between 2 coaxial connector screens needs a plurality of electric capacity, normally 4, also needs a circuit board that electric capacity, 2 coaxial connectors are welded together.For obtaining better high frequency performance and shield effectiveness, some isolator uses annular capacitor, 2 coaxial connectors is connected with insulation spacer by the custom-designed coaxial connector that has the screw thread of little external diameter.
Along with the decline of set-top box cost, harsher requirement is proposed also for the cost of isolator.No matter the scheme that screen is isolated in the isolator is the scheme that a plurality of electric capacity add circuit board, or the scheme of annular capacitor, all exists cost higher, the assembly process complicated problems.
In present patent document, have open: " a kind of television antenna isolator (CN202364309U) ", second coaxial slicing ear that it has housing, circuit board, can plug first coaxial slicing ear with the signal input terminal of cable TV and can plug with the cable television system signal output terminal; This circuit board is installed in this housing, and two axle splicing ears are installed in respectively on the sidewall of this housing; The signal capacitance is serially connected between the heart yearn of two coaxial slicing ear on this circuit board; Three ground wire capacitances are parallel with one another and be serially connected with between the front side of screen of two coaxial slicing ear on this circuit board; In addition three ground wire capacitances are parallel with one another and be serially connected with between the rear side of screen of two coaxial slicing ear on this circuit board.
Summary of the invention
The invention provides a kind of simple in structurely, assembly process is simple, production efficiency height, the radiofrequency signal earth-current isolator that cost is low; Solved the complex structure of the isolator that exists in the prior art, the assembly process complexity, the permissible accuracy height, production efficiency is low, the technical problem that cost is higher.
Above-mentioned technical problem of the present invention solves by following technical proposals: a kind of radiofrequency signal earth-current isolator, comprise interconnective first coaxial connector and second coaxial connector, first coaxial connector and second coaxial connector include a screen and an insulator, be provided with the core pin in one of them coaxial connector, be provided with jump ring in the another one coaxial connector, it is characterized in that: first insulator of described first coaxial connector is positioned at first screen, second insulator of second coaxial connector is positioned at the secondary shielding layer, one end and first screen of secondary shielding layer have crossing superposition section, be provided with the gap at first screen and secondary shielding layer superposed part, in the gap, be provided with the conducting medium layer.Two coaxial connectors interconnect, and the part of secondary shielding layer is positioned at first screen overlapped part, and overlapping part may be axial, also may be radial direction.First screen, first insulator, secondary shielding layer, second insulator are coaxial setting.According to actual needs, the thickness of adjusting play and length, and the dielectric constant values of filling can capacitance value.Utilize the surface of screen of two coaxial connectors of isolator as the electrode of electric capacity, filled dielectric material between the screen of two coaxial connectors has constituted enough isolation capacitances of big screen spare of numerical value.Thereby no longer need 4 electric capacity and circuit board, also no longer need annular capacitor.Simple in structure, with low cost.Also simplify the operation of assembling, possessed good high frequency characteristics and shielding properties.
As a kind of preferred, described gap is cylindric, the conducting medium layer of filling in the gap is high-K capacitor porcelain powder or high-k epoxy, the cross section of described first insulator is T-shaped, first screen, secondary shielding layer are cylindric, first insulator, first screen, second insulator, secondary shielding layer, the equal coaxial arrangement of conducting medium, the outer wall of the inwall of conducting medium layer and secondary shielding layer joins, and the inwall of the outer wall of conducting medium layer and first screen joins.The secondary shielding layer is cylindric, and wherein an end is connected on the cascaded surface of first insulator, and the other end inwardly has flange, and the second insulator end is connected on the flange.A wherein end of first insulator is connected on the shaft shoulder of the first screen inwall.The gap is cylindric, the opening in gap is in the axial direction, filling dielectric material in the gap, so between first screen and secondary shielding layer, generated enough big electric capacity, usually arrive between thousands of pF tens of, this electric capacity is Low ESR to the radiofrequency signal of needs transmission, and the electrical network low frequency signal is high impedance, plays buffer action.
Preferred as another kind, described gap is annular, the conducting medium layer of filling in the gap is high-K capacitor porcelain powder or high-k epoxy, the end of described first screen is provided with first annular flange, be provided with second annular flange at the middle part of secondary shielding layer, the external diameter of first annular flange equates with the external diameter of second annular flange, and the gap is between the end face that first annular flange and second annular flange join.The middle part of secondary shielding layer neither just be refered in particular in the middle of secondary shielding layer, may be on the upper side or on the lower side.The flange face of first screen and secondary shielding layer joins, and forms a space between two end faces that join, and the opening in gap is in the radial direction, makes things convenient for the filling dielectric material, and structure is more simple.
Preferred as another, it is first insulator in the described gap, one end of first insulator is connected to the shaft shoulder place in first screen, the other end of first insulator is provided with the flanging of an annular, the end of first screen is connected on the flanging of first insulator, external peripheral surface at first screen is wound with insulation film, external peripheral surface at insulation film is wound with metal forming, the end of metal forming bends inwards and forms the in-flanges of an annular, be provided with second annular flange at the middle part of secondary shielding layer, one of them end face and first insulator of in-flanges join, and another end face of in-flanges and the end face of second annular flange join.The gap is filled by first insulator fully, save the step of independent other dielectric substances of filling, the dielectric constant of the first insulator material is lower usually, make the capacitance of winning between screen and the secondary shielding layer less than normal, twine insulation film at the first screen external peripheral surface, outside insulation film, twine metal forming again, so first screen and metal forming form a capacitor, with the inside bending in the end of metal forming, and compressed by second annular flange on the secondary shielding layer, make metal forming and secondary shielding layer realize being electrically connected.So enough big electric capacity has been arranged between first screen and secondary shielding layer.The cost of insulation film and metal forming is quite low, and pad pasting also can be realized by machine on cylinder, and operation is also simple.After adopting this cylindrical film electric capacity, the high frequency performance of whole isolated device significantly improves, and 1GHz is following to insert loss less than 0.3 dB, and 2GHz is following to insert loss less than 1dB, inserts loss during 2.6GHz less than 1.5dB.
As more preferably, the thickness of described metal forming and insulation film is all less than 0.05mm.About the desirable 0.03mm of the thickness of insulation film, make the electric capacity of winning between screen and the metal forming reach hundreds of pF, withstand voltage greater than 1kV, can satisfy the requirement that the transmission of high frequency cable TV signal and low-frequency high-voltage are isolated.
The position of core pin and jump ring can be allocated with different external devices according to different connectors, as a kind of preferred, described core pin is positioned at first coaxial connector, and described jump ring is positioned at second coaxial connector, seals in electric capacity between core pin and the jump ring.Form two isolators.
As preferably, in first screen, be provided with screw thread, outside the secondary shielding layer, be provided with screw thread.Make thread forms, form the F head connector, use that can be general is on set-top box.Install and remove convenience simple in structure.
Preferred as another kind, described core pin is positioned at second coaxial connector, described jump ring is positioned at first coaxial connector, be provided with circuit board between core pin and the jump ring, be welded with electric capacity at circuit board, the core pin is connected by electric capacity with jump ring, is provided with external jump ring in first screen, one end of external jump ring is connected on the flange that turns in the first screen end, and the other end of external jump ring is connected on first insulator.Be formed for the isolator of the employing 9.5mmTV straight cutting connector on the television set.Simple in structure, mounting or dismounting are convenient.
Therefore, radiofrequency signal earth-current isolator of the present invention possesses following advantage: simple in structure, cost is low, and high frequency performance is good, and the high frequency low frequency is taken into account, full-shield, and assembly process is simple.
Description of drawings
Fig. 1 is first kind of schematic diagram of radiofrequency signal earth-current isolator of the present invention.
Fig. 2 is second kind of schematic diagram of radiofrequency signal earth-current isolator of the present invention.
Fig. 3 is the third schematic diagram of radiofrequency signal earth-current isolator of the present invention.
Fig. 4 is the 4th kind of schematic diagram of radiofrequency signal earth-current isolator of the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical scheme of inventing is described in further detail.
Embodiment 1:
As shown in Figure 1, a kind of radiofrequency signal earth-current isolator, comprise first coaxial connector 1 and second coaxial connector 2, first coaxial connector 1 is to be made of first screen 4 and first insulator 5 and the core pin 3 that are positioned at first screen 4, and second coaxial connector 2 is to be made of secondary shielding layer 6 and second insulator 7 and the jump ring 8 that are positioned at secondary shielding layer 6.
The axial section of first insulator 5 is "T"-shaped, and an end of first insulator 5 is connected to the shaft shoulder place on first screen, 4 inwalls, and the external peripheral surface of first screen 4 is shiny surface.Secondary shielding layer 6 is cylindric, and an end of secondary shielding layer 6 is connected to the ladder place of first insulator 5, at the other end of secondary shielding layer 6 flange is inwardly arranged, and the end of second insulator 7 is connected on the flange of secondary shielding layer 6.First screen 4, first insulator 5, secondary shielding layer 6 and second insulator, 7 equal coaxial arrangement.
Middle part at first insulator 5 offers through hole, and core pin 3 is installed in through hole, in second insulator, 7 inside jump ring 8 is installed, and an end of jump ring 8 joins by electric capacity 10 and core pin 3, and the other end of jump ring 8 is connected to the inner face of second insulator 7.Two spacer structures have been realized.
Certainly, core pin 3 also can directly link to each other with jump ring 8, forms single isolator, according to different use needs, selects different frame modes.
Embodiment 2:
As shown in Figure 2, as different from Example 1, one end of first screen 4 is one-body molded first annular flange 11, near an end of first coaxial connector is one-body molded second annular flange 12 arranged at the middle part of secondary shielding layer 6, first annular flange 11 and second annular flange 12 are parallel to each other, the external diameter of first annular flange 11 is identical with the external diameter of second annular flange 12, between the end face of two flanges, leave gap 9, gap 9 is annular, and the external diameter in gap 9 is identical with second annular flange 12 with first annular flange 11.The opening direction in gap 9 is filled with the dielectric substance of high-k epoxy along the radial direction of first screen 4 in the gap 9, dielectric substance is filled by radial direction, and filling work procedure is simpler.First annular flange 11 and first insulator 5 of one of them end face of dielectric substance and first screen join, and second annular flange 12 of another end face of dielectric substance and secondary shielding layer joins.
Embodiment 3:
As shown in Figure 3, as different from Example 1, first screen 4 is one cylindric, and wall has shaft shoulder design within it, and there is integrated second annular flange 12 at the middle part of secondary shielding layer 6.What fill in gap 9 is first insulator 5, just first insulator 5 is extended in the gap 9, first insulator 5 has the flanging of an annular, the external diameter of flanging equates with first screen 4, just the end of first screen 4 is connected on the flanging of first insulator 5, and the external peripheral surface of the flanging of first insulator 5 is concordant with the external peripheral surface of first screen 4.External peripheral surface at first screen twines insulation film 13 then, and the external peripheral surface at insulation film 13 twines metal forming 14 again, and insulation film 13 has wrapped up the flanging external peripheral surface of first screen and first insulator.So first screen 4 and metal forming 14 form a capacitor.With the end 15 inside bendings of metal forming 14, and compressed by second annular flange 12 at secondary shielding layer 6 middle part, make metal forming 14 realize being electrically connected with screen 6.So enough big electric capacity has been arranged between first screen 4 and secondary shielding layer 6.The thickness of metal forming is less than 0.05mm, and the thickness of insulation film 13 is 0.03mm, makes the electric capacity of winning between screen and the metal forming reach hundreds of pF, and is withstand voltage greater than 1kV, can satisfy the requirement that the transmission of high frequency cable TV signal and low-frequency high-voltage are isolated.All the other are identical with embodiment 1.
The cost of insulation film 13 and metal forming 14 is quite low, and pad pasting can be realized by machine on cylinder, and operation is also simple.After adopting this cylindrical film electric capacity, the high frequency characteristics of whole isolated device significantly improves, and 1GHz is following to insert loss less than 0.3dB, and 2GHz is following to insert loss less than 1dB, inserts loss during 2.6GHz less than 1.5dB.
Embodiment 4:
As shown in Figure 4, as different from Example 3, when isolator is used on the television set, adopt 9.5mm TV straight cutting connector construction usually.Core pin 3 among the embodiment 3 changed into connect jump ring 20, jump ring 8 changes connection-core pin 21, the second insulators 7 into and changes into circularly, and increases grafting jump ring 18 at first screen, 4 inner edges.Adopting circuit board 19 will connect jump ring 20, connection-core pin 21 and electric capacity 10 is connected.This board area is quite little, and cost is low.
If the tuner input string of CATV set-top-box and television set etc. has an electric capacity, use this electric capacity instead rated insulation voltage value high electric capacity, desirable greater than 500V, play the effect that the heart yearn high pressure is isolated, then external isolator only need be used single isolator, can the electric capacity 10 among Fig. 1, Fig. 2, Fig. 3 and Fig. 4 be saved, core pin 3 can directly be connected with core pin jump ring 8.Further reduce cost, simplify working process.
Claims (9)
1. radiofrequency signal earth-current isolator, comprise interconnective first coaxial connector and second coaxial connector, first coaxial connector and second coaxial connector include a screen and an insulator, be provided with the core pin in one of them coaxial connector, be provided with jump ring in the another one coaxial connector, it is characterized in that: first insulator of described first coaxial connector is positioned at first screen, second insulator of second coaxial connector is positioned at the secondary shielding layer, one end and first screen of secondary shielding layer have crossing superposition section, be provided with the gap at first screen and secondary shielding layer superposed part, in the gap, be provided with the conducting medium layer.
2. radiofrequency signal earth-current isolator according to claim 1, it is characterized in that: described gap is cylindric, the conducting medium layer of filling in the gap is high-K capacitor porcelain powder or high-k epoxy, the cross section of described first insulator is T-shaped, first screen, the secondary shielding layer is cylindric, first insulator, first screen, second insulator, the secondary shielding layer, the equal coaxial arrangement of conducting medium, the outer wall of the inwall of conducting medium layer and secondary shielding layer joins, and the inwall of the outer wall of conducting medium layer and first screen joins.
3. radiofrequency signal earth-current isolator according to claim 1, it is characterized in that: described gap is annular, the conducting medium layer of filling in the gap is high-K capacitor porcelain powder or high-k epoxy, the end of described first screen is provided with first annular flange, be provided with second annular flange at the middle part of secondary shielding layer, the external diameter of first annular flange equates with the external diameter of second annular flange, and the gap is between the end face that first annular flange and second annular flange join.
4. radiofrequency signal earth-current isolator according to claim 1, it is characterized in that: be first insulator in the described gap, one end of first insulator is connected to the shaft shoulder place in first screen, the other end of first insulator is provided with the flanging of an annular, the end of first screen is connected on the flanging of first insulator, external peripheral surface at first screen is wound with insulation film, external peripheral surface at insulation film is wound with metal forming, the end of metal forming bends inwards and forms the in-flanges of an annular, be provided with second annular flange at the middle part of secondary shielding layer, one of them end face and first insulator of in-flanges join, and another end face of in-flanges and the end face of second annular flange join.
5. radiofrequency signal earth-current isolator according to claim 4, it is characterized in that: the thickness of described metal forming and insulation film is all less than 0.05mm.
6. according to any described radiofrequency signal earth-current isolator of claim 1 to 5, it is characterized in that: described core pin is positioned at first coaxial connector, and described jump ring is positioned at second coaxial connector, seals in electric capacity between core pin and the jump ring.
7. according to any described radiofrequency signal earth-current isolator of claim 1 to 5, it is characterized in that: in first screen, be provided with screw thread, outside the secondary shielding layer, be provided with screw thread.
8. radiofrequency signal earth-current isolator according to claim 6 is characterized in that: be provided with screw thread in first screen, be provided with screw thread outside the secondary shielding layer.
9. according to any described radiofrequency signal earth-current isolator of claim 1 to 5, it is characterized in that: described core pin is positioned at second coaxial connector, described jump ring is positioned at first coaxial connector, be provided with circuit board between core pin and the jump ring, be welded with electric capacity at circuit board, the core pin is connected by electric capacity with jump ring, in first screen, be provided with external jump ring, one end of external jump ring is connected on the flange that turns in the first screen end, and the other end of external jump ring is connected on first insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210409452.6A CN103337681B (en) | 2012-10-24 | 2012-10-24 | Ground current isolator for radio frequency signals |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210409452.6A CN103337681B (en) | 2012-10-24 | 2012-10-24 | Ground current isolator for radio frequency signals |
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| Publication Number | Publication Date |
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| CN103337681A true CN103337681A (en) | 2013-10-02 |
| CN103337681B CN103337681B (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210409452.6A Expired - Fee Related CN103337681B (en) | 2012-10-24 | 2012-10-24 | Ground current isolator for radio frequency signals |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300276A (en) * | 2013-12-05 | 2015-01-21 | 中航光电科技股份有限公司 | Electric connector |
| CN105357580A (en) * | 2015-12-03 | 2016-02-24 | 浪潮软件集团有限公司 | Set top box and system for supplying power to front-end equipment |
| CN110277706A (en) * | 2019-07-09 | 2019-09-24 | 东莞市联晨鑫电子科技有限公司 | Radio frequency connector |
| CN113552422A (en) * | 2021-07-30 | 2021-10-26 | 上海华碧检测技术有限公司 | High-frequency enhanced three-coaxial-method shielding effectiveness test system and test method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731624A (en) * | 2005-08-17 | 2006-02-08 | 海信集团有限公司 | Radio-frequency cable with loop seclusion function |
| CN202871949U (en) * | 2012-10-24 | 2013-04-10 | 甘肃省电力公司电力科学研究院 | Current isolator |
-
2012
- 2012-10-24 CN CN201210409452.6A patent/CN103337681B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731624A (en) * | 2005-08-17 | 2006-02-08 | 海信集团有限公司 | Radio-frequency cable with loop seclusion function |
| CN202871949U (en) * | 2012-10-24 | 2013-04-10 | 甘肃省电力公司电力科学研究院 | Current isolator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300276A (en) * | 2013-12-05 | 2015-01-21 | 中航光电科技股份有限公司 | Electric connector |
| CN105357580A (en) * | 2015-12-03 | 2016-02-24 | 浪潮软件集团有限公司 | Set top box and system for supplying power to front-end equipment |
| CN110277706A (en) * | 2019-07-09 | 2019-09-24 | 东莞市联晨鑫电子科技有限公司 | Radio frequency connector |
| CN113552422A (en) * | 2021-07-30 | 2021-10-26 | 上海华碧检测技术有限公司 | High-frequency enhanced three-coaxial-method shielding effectiveness test system and test method thereof |
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| CN103337681B (en) | 2015-07-08 |
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