CN103337681B - Ground current isolator for radio frequency signals - Google Patents
Ground current isolator for radio frequency signals Download PDFInfo
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- CN103337681B CN103337681B CN201210409452.6A CN201210409452A CN103337681B CN 103337681 B CN103337681 B CN 103337681B CN 201210409452 A CN201210409452 A CN 201210409452A CN 103337681 B CN103337681 B CN 103337681B
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- screen
- insulator
- shielding layer
- coaxial connector
- secondary shielding
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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, particularly relate to one and there is obstruct direct current and low frequency signal, by the isolator of radiofrequency signal.
Background technology
The Set Top Box of every household or television set are linked together by cable by cable TV network, between each user, between user and CATV transmission equipment, may exist earthy inconsistent, earth-return circulation can be produced in the cable, cause electric cable heating, device damage, time serious, may fire be caused.
Use radio frequency signal ground return isolator (hereinafter referred to as isolator), can cut off grounded circuit electric current, Accident prevention occurs.This type of isolator is realized by 2 coaxial connectors and several electric capacity usually, is connected between the ground of two coaxial connectors by electric capacity.Hundreds of electric capacity to thousands of pF is Low ESR to 48MHz-950MHz cable TV signal, but to direct current and low frequency, especially the signal of 50Hz or 60Hz is high impedance, prevents AC network potential difference from Transforming of Wire TV Cable, producing earth-return electric current.
Usually the isolation of the screen of cable of cable TV is only needed can to prevent earth-return electric current from producing.Therefore isolator only seals in electric capacity at screen.Isolated Shield layer, heart yearn is straight-through, and this type of isolator is commonly referred to as single isolator.
For guaranteeing better safe effect, also can seal in electric capacity on heart yearn, so heart yearn and screen are all isolate, being called two isolator.
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 multiple electric capacity, normally 4, also needs a circuit board electric capacity, 2 coaxial connectors to be welded together.For obtaining better high frequency performance and shield effectiveness, some isolator uses annular capacitor, is connected by 2 coaxial connectors with insulation spacer by the coaxial connector of the custom-designed screw thread with little external diameter.
Along with the decline of Set Top Box cost, harsher requirement is also proposed to the cost of isolator.No matter the scheme of screen isolation in isolator is the scheme that multiple electric capacity adds circuit board, or the scheme of annular capacitor, all there is high expensive, the problem of assembly process complexity.
Have open in present patent document: " a kind of television antenna isolator (CN202364309U) ", it has housing, circuit board, second coaxial slicing ear that can plug the first coaxial slicing ear with the signal input terminal of cable TV and can plug with cable television system signal output terminal; This circuit board is arranged in this housing, and two axle splicing ears are arranged on the sidewall of this housing respectively; On this circuit board, 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 between the front side being serially connected with the screen of two coaxial slicing ear; On this circuit board, another three ground wire capacitances are parallel with one another and between the rear side being serially connected with the screen of two coaxial slicing ear.
Summary of the invention
The invention provides a kind of structure simple, assembly process is simple, and production efficiency is high, the galvanic separation of the radiofrequency signal that cost is low; Solve the complex structure of the isolator existed in prior art, assembly process is complicated, and permissible accuracy is high, and production efficiency is low, the technical problem of high expensive.
Above-mentioned technical problem of the present invention is solved by following technical proposals: a kind of galvanic separation of radiofrequency signal, comprise interconnective first coaxial connector and the second coaxial connector, first coaxial connector and the second coaxial connector include a screen and an insulator, core pin is provided with in one of them coaxial connector, jump ring is provided with in another one coaxial connector, it is characterized in that: the first insulator of the first described coaxial connector is positioned at the first screen, second insulator of the second coaxial connector is positioned at secondary shielding layer, there is crossing superposition section one end of secondary shielding layer with the first screen, the part overlapped with secondary shielding layer at the first screen is provided with gap, conducting medium layer is provided with in gap.Two coaxial connectors are interconnected, and a part for secondary shielding layer is positioned at the first screen overlapped part, and overlapping part may be axial, also may be radial direction.First screen, the first insulator, secondary shielding layer, the 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 electrode of surface as electric capacity of the screen of isolator two coaxial connectors, filled dielectric material between the screen of two coaxial connectors, constitute the isolation capacitance of the enough large screen part of numerical value.Thus no longer need 4 electric capacity and circuit board, also no longer need annular capacitor.Structure is simple, with low cost.Also simplify the operation of assembling, possess good high frequency characteristics and shielding properties.
Preferred as one, described gap is cylindric, the conducting medium layer of filling in gap is high-K capacitor porcelain powder or high-k epoxy, the cross section of the first described insulator is T-shaped, first screen, secondary shielding layer are cylindrical shape, first insulator, the first screen, the second insulator, secondary shielding layer, conducting medium are all coaxially arranged, the inwall of conducting medium layer connects with the outer wall of secondary shielding layer, and the outer wall of conducting medium layer connects with the inwall of the first screen.Cylindrically, wherein one end is connected on the cascaded surface of the first insulator secondary shielding layer, and the other end inwardly has flange, and the second insulator end is connected on flange.Wherein one end of first insulator is connected on the shaft shoulder of the first screen inwall.Gap is cylindric, the opening in gap is in the axial direction, filling dielectric material in gap, so generate enough large electric capacity between the first screen and secondary shielding layer, usually arrive between thousands of pF tens of, this electric capacity is Low ESR to the radiofrequency signal needing transmission, is high impedance, plays buffer action to electrical network low frequency signal.
Preferred as another kind, described gap is annular, the conducting medium layer of filling in gap is high-K capacitor porcelain powder or high-k epoxy, the end of the first described screen is provided with the first annular flange, the second annular flange is provided with at the middle part of secondary shielding layer, the external diameter of the first annular flange is equal with the external diameter of the second annular flange, between the end face that gap connects at the first annular flange and the second annular flange.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 the first screen and secondary shielding layer connects, and between two end faces connected, form a space, the opening in gap is in radial directions, facilitates filling dielectric material, and structure is more simple.
Preferred as another, it is the first insulator in described gap, one end of first insulator is connected to the shaft shoulder place in the first screen, the other end of the first insulator is provided with the flanging of an annular, the end abutment of the first screen is on the flanging of the first insulator, insulation film is wound with at the external peripheral surface of the first screen, metal forming is wound with at the external peripheral surface of insulation film, the end of metal forming bends inwards the in-flanges of formation one annular, the second annular flange is provided with at the middle part of secondary shielding layer, one of them end face of in-flanges connects with the first insulator, another end face of in-flanges connects with the end face of the second annular flange.Gap is filled by the first insulator completely, save the step of filling separately other dielectric substances, the dielectric constant of the first isolator material is usually lower, make the capacitance between the first screen and secondary shielding layer less than normal, insulation film is wound around at the first screen external peripheral surface, metal forming is wound around outward again at insulation film, so the first screen and metal forming form a capacitor, by inside for the end of metal forming bending, and compressed by the second annular flange on secondary shielding layer, make metal forming and secondary shielding layer realize being electrically connected.So there has been enough large electric capacity between the 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 the cylinder, and operation is also simple.After adopting this cylindrical film electric capacity, the high frequency performance of whole isolator significantly improves, and below 1GHz insertion loss is less than 0.3dB, and below 2GHz insertion loss is less than 1dB, and during 2.6GHz, insertion loss is less than 1.5dB.
As more preferably, described metal forming and the thickness of insulation film are all less than 0.05mm.Desirable about the 0.03mm of thickness of insulation film, makes the electric capacity between the first screen and metal forming reach hundreds of pF, is withstand voltagely greater than 1kV, can meet the requirement of high-frequency wire television signal transmission and low-frequency high-voltage isolation.
The position of core pin and jump ring can be allocated according to different connectors and different external devices, preferred as one, described core pin is positioned at the first coaxial connector, and described jump ring is positioned at the second coaxial connector, seals in electric capacity between core pin and jump ring.Form two isolator.
As preferably, in the first screen, be provided with screw thread, outside secondary shielding layer, be provided with screw thread.Make thread forms, form F head connector, use that can be general on the set-top box.Assembling-disassembling structure is simple and convenient.
Preferred as another kind, described core pin is positioned at the second coaxial connector, described jump ring is positioned at the first coaxial connector, circuit board is provided with between core pin and jump ring, be welded with electric capacity on circuit boards, core pin is connected by electric capacity with jump ring, in the first screen, be provided with external jump ring, one end of external jump ring is connected on the flange of the first screen end varus, and the other end of external jump ring is connected on the first insulator.Form the isolator of the employing 9.5mmTV straight cutting connector on television set.Structure is simple, and mounting or dismounting are convenient.
Therefore, the galvanic separation of radiofrequency signal of the present invention possesses following advantage: structure is simple, and cost is low, and high frequency performance is good, and high frequency low frequency is taken into account, full-shield, and assembly process is simple.
Accompanying drawing explanation
Fig. 1 is the first schematic diagram of the galvanic separation of radiofrequency signal of the present invention.
Fig. 2 is the second schematic diagram of the galvanic separation of radiofrequency signal of the present invention.
Fig. 3 is the third schematic diagram of the galvanic separation of radiofrequency signal of the present invention.
Fig. 4 is the 4th kind of schematic diagram of the galvanic separation of radiofrequency signal of the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical scheme of invention is described in further detail.
Embodiment 1:
As shown in Figure 1, a kind of galvanic separation of radiofrequency signal, comprise the first coaxial connector 1 and the second coaxial connector 2, first coaxial connector 1 is made up of the first screen 4 and the first insulator 5 and core pin 3 being positioned at the first screen 4, and the second coaxial connector 2 is made up of secondary shielding layer 6 and the second insulator 7 and jump ring 8 being positioned at secondary shielding layer 6.
The axial section of the first insulator 5 is "T"-shaped, and one end of the first insulator 5 is connected to the shaft shoulder place on the first screen 4 inwall, and the external peripheral surface of the first screen 4 is shiny surface.Cylindrically, one end of secondary shielding layer 6 is connected to the ladder place of the first insulator 5 to secondary shielding layer 6, inwardly has flange at the other end of secondary shielding layer 6, and the end abutment of the second insulator 7 is on the flange of secondary shielding layer 6.First screen 4, first insulator 5, secondary shielding layer 6 and the second insulator 7 are all coaxially arranged.
Secondary shielding layer 6 is plugged in the first screen 4, and both have some areas to be that inside and outside overlapping formation is two-layer.Between secondary shielding layer 6 and the first screen 4, have the gap 9 of a cylindrical shape, in gap 9, be filled with dielectric substance, dielectric substance can be high-K capacitor porcelain powder or high-k epoxy etc.The opening in gap 9 is positioned on the axial direction of the first screen 4.Because be filled with dielectric substance in gap, so define electric capacity between the first screen 4 and secondary shielding layer 6, this electric capacity is Low ESR to the radiofrequency signal needing transmission, is high impedance, serves buffer action to electrical network low frequency signal.According to actual needs, the thickness of adjusting play and length, and the dielectric constant values of filling, can capacitance value.Such as, as gap 9 external diameter 11mm, internal diameter 9mm, length 20mm, when dielectric Constant is 1000, capacitance is about 5000pF.
Offer through hole at the middle part of the first insulator 5, be provided with core pin 3 in through hole, be provided with jump ring 8 in the second insulator 7 inside, one end of jump ring 8 is connected with core pin 3 by electric capacity 10, and the other end of jump ring 8 is connected to the inner face of the second insulator 7.Achieve two spacer structures.
Certainly, core pin 3 also can directly be connected 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 the first annular flange 11, one-body molded near one end of the first coaxial connector at the middle part of secondary shielding layer 6 have the second annular flange 12, first annular flange 11 and the second annular flange 12 are parallel to each other, the external diameter of the first annular flange 11 is identical with the external diameter of the second annular flange 12, gap 9 is left between the end face of two flanges, gap 9 is in annular, and the external diameter in gap 9 is identical with the second annular flange 12 with the first annular flange 11.The opening direction in gap 9 is along the radial direction of the first screen 4, and be filled with the dielectric substance of high-k epoxy in gap 9, dielectric substance is filled by radial direction, and filling work procedure is simpler.One of them end face of dielectric substance connects with the first annular flange 11 of the first screen and the first insulator 5, and another end face of dielectric substance connects with the second annular flange 12 of secondary shielding layer.
The cylindrical shape of the first insulator 5 in one end open, one end of the first insulator 5 is connected to the shaft shoulder place of the first screen 4 inwall.The inwall of the first screen 4 offers internal thread 16, offers external screw thread 17 at the external peripheral surface of secondary shielding layer.All the other and embodiment 1 are together.
Embodiment 3:
As shown in Figure 3, as different from Example 1, the first screen 4 is a cylindrical shape, and within it wall has the shaft shoulder to design, and there is integrated second annular flange 12 at the middle part of secondary shielding layer 6.What fill in gap 9 is the first insulator 5, namely the first insulator 5 is extended in gap 9, first insulator 5 has the flanging of an annular, the external diameter of flanging is equal with the first screen 4, namely the end abutment of the first screen 4 is on the flanging of the first insulator 5, and the external peripheral surface of the flanging of the first insulator 5 is concordant with the external peripheral surface of the first screen 4.Then be wound around insulation film 13 at the external peripheral surface of the first screen, then be wound around metal forming 14 at the external peripheral surface of insulation film 13, insulation film 13 has wrapped up the flanging external peripheral surface of the first screen and the first insulator.So the first screen 4 and metal forming 14 form a capacitor.By the inwardly bending of the end 15 of metal forming 14, and compressed by the second annular flange 12 in the middle part of secondary shielding layer 6, make metal forming 14 realize being electrically connected with screen 6.So there has been enough large electric capacity between the 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 between the first screen and metal forming reach hundreds of pF, is withstand voltagely greater than 1kV, can meet the requirement of high-frequency wire television signal transmission and low-frequency high-voltage isolation.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 the cylinder, and operation is also simple.After adopting this cylindrical film electric capacity, the high frequency characteristics of whole isolator significantly improves, and below 1GHz insertion loss is less than 0.3dB, and below 2GHz insertion loss is less than 1dB, and during 2.6GHz, insertion loss is less than 1.5dB.
Embodiment 4:
As shown in Figure 4, as different from Example 3, when isolator is with on a television set, 9.5mm TV straight cutting connector construction is usually adopted.Change the core pin 3 in embodiment 3 into connection circlip 20, jump ring 8 changes connection core pin 21, second insulator 7 into and changes into circular, and increases grafting jump ring 18 in the first screen 4 inner edge.Circuit board 19 is adopted connection circlip 20, connection core pin 21 to be connected with electric capacity 10.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, this electric capacity is used instead the high electric capacity of rated insulation voltage value, desirablely be greater than 500V, play the effect of heart yearn high_voltage isolation, then external isolator only needs to use single isolator, electric capacity 10 in Fig. 1, Fig. 2, Fig. 3 and Fig. 4 can be saved, core pin 3 can directly be connected with core pin jump ring 8.Reduce costs further, simplify operation.
Claims (9)
1. the galvanic separation of a radiofrequency signal, comprise interconnective first coaxial connector and the second coaxial connector, first coaxial connector and the second coaxial connector include a screen and an insulator, core pin is provided with in one of them coaxial connector, jump ring is provided with in another one coaxial connector, it is characterized in that: the first insulator of the first described coaxial connector is positioned at the first screen, second insulator of the second coaxial connector is positioned at secondary shielding layer, there is crossing superposition section one end of secondary shielding layer with the first screen, the part overlapped with secondary shielding layer at the first screen is provided with gap, conducting medium layer is provided with in gap.
2. the galvanic separation of radiofrequency signal according to claim 1, it is characterized in that: described gap is for cylindric, the conducting medium layer of filling in gap is high-K capacitor porcelain powder or high-k epoxy, the cross section of the first described insulator is T-shaped, first screen, secondary shielding layer is cylindrical shape, first insulator, first screen, second insulator, secondary shielding layer, conducting medium is all coaxially arranged, the inwall of conducting medium layer connects with the outer wall of secondary shielding layer, the outer wall of conducting medium layer connects with the inwall of the first screen.
3. the galvanic separation of radiofrequency signal according to claim 1, it is characterized in that: described gap is annular, the conducting medium layer of filling in gap is high-K capacitor porcelain powder or high-k epoxy, the end of the first described screen is provided with the first annular flange, the second annular flange is provided with at the middle part of secondary shielding layer, the external diameter of the first annular flange is equal with the external diameter of the second annular flange, between the end face that gap connects at the first annular flange and the second annular flange.
4. the galvanic separation of radiofrequency signal according to claim 1, it is characterized in that: be the first insulator in described gap, one end of first insulator is connected to the shaft shoulder place in the first screen, the other end of the first insulator is provided with the flanging of an annular, the end abutment of the first screen is on the flanging of the first insulator, insulation film is wound with at the external peripheral surface of the first screen, metal forming is wound with at the external peripheral surface of insulation film, the end of metal forming bends inwards the in-flanges of formation one annular, the second annular flange is provided with at the middle part of secondary shielding layer, one of them end face of in-flanges connects with the first insulator, another end face of in-flanges connects with the end face of the second annular flange.
5. the galvanic separation of radiofrequency signal according to claim 4, is characterized in that: described metal forming and the thickness of insulation film are all less than 0.05mm.
6. the galvanic separation of the radiofrequency signal according to claim 1 to 5 any one, is characterized in that: described core pin is positioned at the first coaxial connector, and described jump ring is positioned at the second coaxial connector, seals in electric capacity between core pin and jump ring.
7. the galvanic separation of the radiofrequency signal according to claim 1 to 5 any one, is characterized in that: in the first screen, be provided with screw thread, outside secondary shielding layer, be provided with screw thread.
8. the galvanic separation of radiofrequency signal according to claim 6, is characterized in that: in the first screen, be provided with screw thread, outside secondary shielding layer, be provided with screw thread.
9. the galvanic separation of the radiofrequency signal according to claim 1 to 5 any one, it is characterized in that: described core pin is positioned at the second coaxial connector, described jump ring is positioned at the first coaxial connector, circuit board is provided with between core pin and jump ring, be welded with electric capacity on circuit boards, core pin is connected by electric capacity with jump ring, external jump ring is provided with in the first screen, one end of external jump ring is connected on the flange of the first screen end varus, and the other end of external jump ring is connected on the 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 CN103337681A (en) | 2013-10-02 |
| CN103337681B true CN103337681B (en) | 2015-07-08 |
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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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Families Citing this family (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 |
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