CN202535314U

CN202535314U - A filter

Info

Publication number: CN202535314U
Application number: CN 201120526117
Authority: CN
Inventors: 胡海涛
Original assignee: Beijing Bbef Science and Technology Co Ltd
Current assignee: Beijing Bbef Science and Technology Co Ltd
Priority date: 2011-12-15
Filing date: 2011-12-15
Publication date: 2012-11-14
Anticipated expiration: 2021-12-15

Abstract

The utility model relates to a filter comprising N inner conductors, N-1 inductors, N high-voltage-resistant mediums, and an outer conductor, wherein the N is not less than 2. The high-voltage-resistant mediums are non-conducting mediums and each inner conductor is wrapped in a high-voltage-resistant medium. One end of an inductor is connected with an inner conductor, while the other end of the inductor is connected with another inner inductor. A serial inductor set is formed by the N-1 inductors through the N inner conductors. The outer conductor wraps the N inner conductors, the N-1 inductors, and the N high-voltage-resistant mediums. The N high-voltage-resistant mediums contact both the respective inner conductor and the outer conductor so as to form N capacitors. The filter has the advantages of little size and low cost and is very suitable for practical application.

Description

Filter

Technical field

The utility model relates to filtering technique, particularly relates to a kind of filter of high-frequency high-power.

Background technology

At present, in the high-frequency high-power filtering technique, adopt cavity body filter to realize high-frequency high-power filtering usually.The mode that in addition, also can adopt high withstand voltage electric capacity to improve power capacity realizes high-frequency high-power filtering.

The inventor finds in realizing the utility model process: cavity body filter is because it has used distributed constant, so the volume of cavity body filter is bigger, can't be installed on the circuit board usually; In addition, because cavity body filter is higher to requirement on machining accuracy, so the price of cavity body filter is higher; Thereby cavity body filter is because its volume and price factor have restricted the practical application of cavity body filter.The price of the high withstand voltage electric capacity of use in high-power (as 500 watts) filter is higher too; For example; Normally used withstand voltage 1000 volts of above import ceramic condensers, unit price is all more than hundred yuan, thus high withstand voltage electric capacity has improved the cost of filter largely.

Because the problem that above-mentioned existing high-frequency high-power filtering technique exists; The inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge; And cooperate the utilization of scientific principle actively to study innovation; In the hope of founding a kind of filter of new structure, can improve existing high-frequency high-power filtering technique, make it have more practicality.Through continuous research and design, and, found out the utility model of true tool practical value finally through after studying sample and improvement repeatedly.

The utility model content

The main purpose of the utility model is; Overcome the problem that existing high-frequency high-power filtering technique exists, and a kind of filter is provided, technical problem to be solved is; Dwindle the volume of the filter of high-frequency high-power, and reduce the production cost of the filter of high-frequency high-power.

The purpose of the utility model and solve its technical problem and can adopt following technical scheme to realize.

A kind of filter according to the utility model proposes comprises: N inner wire, and said N is not less than 2; N high pressure resistant medium, said high pressure resistant medium is non-conductive medium, and high pressure resistant medium of the outer coating of each said inner wire; N-1 inductance, an end of said inductance is connected with a said inner wire, and the other end is connected with another said inner wire, and a said N-1 inductance forms the series inductance group through said N inner wire; Outer conductor is coated on outside a said N inner wire, a said N-1 inductance and said N the high pressure resistant medium, and said N high pressure resistant medium all contacts with said inner wire and outer conductor and form N electric capacity.

The purpose of the utility model and solve its technical problem and can also adopt following technical measures to come further to realize.

Preferable, aforesaid filter, the material of wherein said inner wire is a copper.

Preferable, aforesaid filter, wherein said inner wire are copper core.

Preferable, aforesaid filter, the length L of one of them said high pressure resistant medium is:

L＝Cd/0.08842KπA；

Wherein, C is a capacitance, and d is the thickness of said high pressure resistant medium, and K is a dielectric constant, and A is the inner wire diameter.

Preferable, aforesaid filter, the material of wherein said high pressure resistant medium is a polytetrafluoroethylene.

Preferable, aforesaid filter, one of them said high pressure resistant medium comprises two separable parts, parts and said inner wire and said outer conductor weld respectively, and are connected with another parts through being spirally connected.

Preferable, aforesaid filter, wherein said separable parts be shaped as U-shaped or arch-shaped or semicircle.

Preferable, aforesaid filter, an end of wherein said inductance and a said inner wire welding, the other end and another said inner wire welding.

Preferable, aforesaid filter, wherein said outer conductor are copper pipe.

Preferable, aforesaid filter, wherein said filter are low pass filter.

By technique scheme; The filter of the utility model has advantage and beneficial effect at least: the utility model is through being provided with high pressure resistant medium between inner wire and outer conductor; And high pressure resistant medium is all contacted with outer conductor with inner wire; Like this, can form the high-voltage capacitance of filter simply and easily; Because the high-voltage capacitance of the utility model is to form with contacting of inner wire and outer conductor by high pressure resistant medium; Therefore; The utility model has avoided distributed constant to cause the problem that the filter volume is big and machining accuracy is high of high-frequency high-power, has also avoided the high problem of cost of using the import ceramic condenser to cause simultaneously; Thereby the utility model has not only dwindled the volume of the filter of high-frequency high-power, and has reduced the production cost of the filter of high-frequency high-power, helps the practical application of the filter of high-frequency high-power, is very suitable for practicality.

In sum, the utility model has obvious improvement technically, and has significantly positive technique effect, becomes the new design of a novelty, progress, practicality.

Above-mentioned explanation only is the general introduction of the utility model technical scheme; In order more to know the technological means of understanding the utility model; And can implement according to the content of specification, and in order to let the above-mentioned of the utility model and other purposes, characteristic and the advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.

Description of drawings

Fig. 1 is the Filter Structures sketch map of the utility model.

Embodiment

For further setting forth the utility model is to reach technological means and the effect that predetermined utility model purpose is taked; Below in conjunction with accompanying drawing and preferred embodiment; To embodiment, structure, characteristic and the effect thereof of the filter that proposes according to the utility model, specify as after.

The filter of the utility model can be the low pass filter of high-frequency high-power.This filter mainly comprises: the high pressure resistant medium of N inner wire 1, N 2, a N-1 inductance 3 and outer conductor 4, N wherein is not less than 2.

The quantity of inner wire 1 is a plurality of, and filter as shown in Figure 1 comprises: 5 inner wires 1.Insulation each other between the inner wire 1.Each inner wire 1 is connected in series with inductance 3, and promptly all inner wires 1 and all inductance 3 are according to inner wire 1, inductance 3, inner wire 1, inductance 3 ..., and being linked in sequence of inner wire 1, an object lesson of serial connection is shown in accompanying drawing 1.The material of the inner wire 1 in the utility model can be copper, and for example, inner wire 1 is a copper core.

The quantity of high pressure resistant medium 2 is identical with the quantity of inner wire 1, and high pressure resistant medium 2 is non-conductive medium.A high pressure resistant medium 2 is coated on the outside of an inner wire 1; The diameter of the inner wire 1 that the length of a high pressure resistant medium 2 can be coated by required capacitance of actual filtering and high pressure resistant medium 2 decides; Generally; The length of a high pressure resistant medium 2 should be less than the length of the inner wire 1 that it coated, a concrete example, and the length L of a high pressure resistant medium 2 can be calculated through following formula (1) and confirm:

L=Cd/0.08842K π A formula (1)

In formula (1), C is a capacitance, and d is the thickness of high pressure resistant medium 2, and K is a dielectric constant, and A is the diameter of inner wire 1.

High pressure resistant medium 2 in the utility model is through all contacting with outer conductor 4 with inner wire 1, thereby forms N high-voltage capacitance with ground.The material of the high pressure resistant medium 2 in the utility model can be polytetrafluoroethylene.In addition; For the ease of installing; Can a high pressure resistant medium 2 be designed to two separable parts and (also can be called two separable parts; Arch-shaped or two semicircles etc. like two U-shapeds or two); Wherein a part (i.e. parts) and inner wire 1 welds respectively with outer conductor 4, and each high pressure resistant medium 2 that is welded on inner wire 1 and the outer conductor 4 is provided with screw, and another part (being another parts) is connected with the high pressure resistant medium 2 that is welded on inner wire 1 and outer conductor 4 with the mode of being spirally connected through this screw.

A concrete example; Being welded on 5 high pressure resistant media 2 on inner wire 1 and the outer conductor 4 shown in Fig. 1 is provided with four screws; Another part of each high pressure resistant medium 2 all is fixedly connected with welding portion through four screws, thereby forms 5 complete high pressure resistant media 2.

The quantity of inductance 3 is lacked one than the quantity of inner wire 1, and each inductance 3 all is connected with two inner wires 1, and all inductance 3 form the series inductance group through all inner wires 1, forms a series inductance group like 4 inductance 3 and 5 inner wires 1 among Fig. 1.Inductance 3 can be welding with the connected mode of inner wire 1, i.e. an end of inductance 3 and inner wire 1 welding, the other end of inductance 3 and 1 welding of another inner wire.

Outer conductor 4 is coated on the outside of all inner wires 1, all high pressure resistant media 2 and all inductance 3.Outer conductor 4 joins with high pressure resistant medium 2, is welded on the inner face of outer conductor 4 like the part of high pressure resistant medium 2.Outer conductor 4 can be specially copper pipe.For the ease of installing, can outer conductor 4 be designed to two separable parts (like two semicircles), one of them parts and high pressure resistant medium 2 weld, and are interlocked with another parts, to form complete outer conductor 4.

The above only is the preferred embodiment of the utility model; Be not that the utility model is done any pro forma restriction; Though the utility model discloses as above with preferred embodiment; Yet be not in order to limit the utility model; Any professional and technical personnel of being familiar with makes a little change or is modified to the equivalent embodiment of equivalent variations when the technology contents of above-mentioned announcement capable of using in not breaking away from the utility model technical scheme scope, is the content that does not break away from the utility model technical scheme in every case;, all still belong in the scope of the utility model technical scheme any simple modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.

Claims

1. a filter is characterized in that, comprising:

N inner wire, said N is not less than 2;

N high pressure resistant medium, said high pressure resistant medium is non-conductive medium, and high pressure resistant medium of the outer coating of each said inner wire;

N-1 inductance, an end of said inductance is connected with a said inner wire, and the other end is connected with another said inner wire, and a said N-1 inductance forms the series inductance group through said N inner wire;

Outer conductor is coated on outside a said N inner wire, a said N-1 inductance and said N the high pressure resistant medium, and said N high pressure resistant medium all contacts with said inner wire and outer conductor and form N electric capacity.

2. filter according to claim 1 is characterized in that, the material of said inner wire is a copper.

3. filter according to claim 2 is characterized in that, said inner wire is a copper core.

4. filter according to claim 3 is characterized in that, the length L of a said high pressure resistant medium is:

L＝Cd/0.08842KπA；

5. filter according to claim 1 is characterized in that, the material of said high pressure resistant medium is a polytetrafluoroethylene.

6. according to claim 1 or 2 or 3 or 4 or 5 described filters, it is characterized in that a said high pressure resistant medium comprises two separable parts, parts and said inner wire and said outer conductor weld respectively, and are connected with another parts through being spirally connected.

7. filter according to claim 6 is characterized in that, said separable parts be shaped as U-shaped or arch-shaped or semicircle.

8. according to claim 1 or 2 or 3 or 4 or 5 described filters, it is characterized in that an end of said inductance and a said inner wire welding, the other end and another said inner wire welding.

9. according to claim 1 or 2 or 3 or 4 or 5 described filters, it is characterized in that said outer conductor is a copper pipe.

10. according to claim 1 or 2 or 3 or 4 or 5 described filters, it is characterized in that said filter is a low pass filter.