CN201946728U

CN201946728U - Cavity filter

Info

Publication number: CN201946728U
Application number: CN2010206964510U
Authority: CN
Inventors: 孙尚传; 童恩东
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2010-12-31
Filing date: 2010-12-31
Publication date: 2011-08-24
Anticipated expiration: 2020-12-31

Abstract

The utility model discloses a cavity filter and particularly relates to a cavity filter of which the side wall of an isolation tendon is provided with an opening. The cavity filter at least comprises a cavity and the isolation tendon; the opening with the top surface being closed is formed on the side wall of the isolation tendon; and the opening passes through the isolation tendon so that both sides of the isolation tendon are communicated with each other. In the embodiment, the top surface of the opening on the side wall of the isolation tendon is closed. Compared with the prior art, the cavity filter meets the wiring requirements and realizes a good signal isolation function, so that the signal interference is reduced.

Description

A kind of cavity body filter

Technical field

The utility model relates to cavity body filter, is specifically related to a kind of cavity body filter of isolation bar sidewall opening.

Background technology

Cavity body filter is widely used in the communications field as a kind of frequency selection device, especially field of radio frequency communication.In the base station, filter is used to select signal of communication, clutter or interference signal that the filtering communication signal frequency is outer.

The structure of cavity body filter of the prior art comprises filter cavity 101 and the isolation bar 102 that filter cavity is isolated into a plurality of little cavitys as shown in Figure 1.The filter cavity inner structure is level and smooth to be to reduce transmission attenuation of radiofrequency signal space and the effective measures that reduce from the holding wire interference respectively with the holding wire centralization, in actual applications, sometimes need between two little cavitys, connect holding wire, the method of taking at present has: wind the line from the signal port coiling of little cavity or from the isolation bar end face, it is long that but the problem that the mode of this coiling exists is a holding wire, radiofrequency signal produced disturb; As shown in Figure 1, therefore, also capable field technique personnel are at the top-down wire casing 104 of leaving one of the end face of isolation bar, the corner angle that can guarantee opening part like this are level and smooth relatively, also can satisfy the length that shortens holding wire, reduce signal and disturb, but this top-down wire casing need machine away too much material adding man-hour, produces very big opening, and is not ideal enough for the effect of Signal Spacing.

The utility model content

The utility model embodiment provides a kind of cavity body filter, can realize that isolation bar opening part structure is level and smooth in the filter cavity, has good Signal Spacing effect simultaneously.

A kind of cavity body filter that the utility model embodiment provides comprises cavity and isolation bar at least, has the opening of end face sealing on described isolation bar sidewall locations, and described opening runs through described isolation bar makes the isolation bar both sides be communicated with.

The utility model embodiment is by leaving the opening of an end face sealing on the cavity body filter sidewall, avoid cutting too much material, the structure of simultaneously this end face sealing and bottom opening can ensure that radiofrequency signal is had the good isolation effect because its opening is little.

Description of drawings

In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of cavity body filter of the prior art;

Fig. 2 is the structural representation of a kind of cavity body filter of providing of the utility model embodiment one;

Fig. 3 is the structural representation of the another kind of cavity body filter that provides of the utility model embodiment two;

Fig. 4 is the generalized section of the another kind of cavity body filter that provides of the utility model embodiment two.

Fig. 5 is the cut-away section schematic diagram of the another kind of cavity body filter that provides of the utility model.

Embodiment

Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.

Embodiment one, a kind of cavity body filter as shown in Figure 2, comprise cavity 201 and isolation bar 202, it is characterized in that, have the opening 204 of end face sealing on described isolation bar sidewall locations, and described opening 204 runs through described isolation bar, make the isolation bar both sides be communicated with.

In the present embodiment, on isolation bar 202 sidewall locations, have the opening 204 of end face sealing, the signal connecting line that is used in the filter passes, this signal connecting line can be tap line or signal transmssion line, the opening of this end face sealing can be around the opening of sealing, also can be the recess that the three side sealing of the left side or the right conducting closes; Described opening is vertically processed along isolation bar by cutting tool, because cutting tool is the cutting tool of T type or L type, adopt the rotary-cut mode to cut isolation bar, therefore described opening cutting face longitudinally is a cambered surface, in order to satisfy the needs of filter transmission, this cambered surface and isolation bar two side wall should avoid occurring too sharp keen angle, and when this cambered surface equates with the angle of isolation bar two side wall, the rotation axis that is cutting tool just in time drops on the plane of isolation bar sidewall decision, and the hatch frame of this moment is best.

In order to obtain the more desirable opening of structure, present embodiment also provides the cavity body filter of another kind of structure, as shown in Figure 3, on isolation bar 202, has a protuberance 203, opening 204 is opened on described protuberance 203, described protuberance can protrude to any side of isolation bar, the two side forms certain angle on this protuberance on its extended line direction, can guarantee the cutting face that cutting tool cuts out and the angle passivation of isolation bar two side wall, avoid occurring the too sharp keen angle structure of opening part.

Present embodiment is by leaving an end face sealing and the level and smooth opening of structure on the cavity body filter sidewall, avoid cutting too much material, the structure of simultaneously this end face sealing and bottom opening can ensure that radiofrequency signal is had the good isolation effect because its opening is little.

Embodiment two, owing to utilize cutting tool to occur that cutting tool touches the isolation bar sidewall and the problem that can't be met the opening of requirement in isolation bar upper shed meeting, therefore this example example provides another kind of cavity body filter that can head it off again, Fig. 4 is the generalized section of this filter, aperture position at isolation bar 202 has a recess 206, when described recess 206 is used to use cutting tool to cut described opening, avoid the handle of a knife 205 of cutting tool.

The isolation bar of above-mentioned recess 206 both sides can be at grade, as shown in Figure 4, opening on the isolation bar 202 of cavity body filter is circumferential closed opening, the isolation bar sidewall of recess 206 both sides is on same plane, promptly by the definite plane of isolation bar sidewall, when using cutting tool to cut described opening, the rotation axis 205 of cutting tool is as far as possible near described plane, because cutting face and the isolation bar front and back wall of cutting tool on isolation bar is vertical forms two angles, cutting tool is that the definite plane of isolation bar sidewall is near more from described plane, it is more little that the angle of so described two angles just differs, and will avoid too sharp keen away from that angle of rotation axis.And be on the plane determined of isolation bar sidewall when rotation axis drops on described plane, the cutting face of cutting tool on isolation bar is vertical equates with two angles that isolation bar front and back wall forms, the angle degree of passivation the best that is obtained, thereby also be best hatch frame.In order to ensure that rotation axis can be tried one's best near described plane is the plane that the isolation bar sidewall is determined, or even to drop on described plane be that described recess is used for avoiding the handle of a knife of cutting tool when cutting on the plane determined of isolation bar sidewall.

The isolation bar of above-mentioned recess 206 both sides also can be not at grade, Fig. 5 is this cavity body filter cut-away section schematic diagram, 2021 and 2022 are respectively the determined plane of isolation bar of recess 206 both sides, plane 2021 and plane 2022 have an intersection, when using cutting tool to cut described opening, the rotation axis 205 of cutting tool is as far as possible near two planes 2021 of described recess both sides isolation bars and 2022 intersection, two angle margins of cutting tool wall formation before and after the cutting face of isolation bar on vertically and isolation bar are reduced, and when the rotation axis 205 of cutting tool overlaps with the intersection on plane 2021 and plane 2022, the cutting face of cutting tool on isolation bar is vertical equates with two angles that isolation bar front and back wall forms, the angle degree of passivation the best that is obtained, thereby also be best hatch frame.

Be equally applicable to the opening that the three side sealing of the left side or the right conducting closes for the said structure feature.

Certainly; in order to guarantee the best of hatch frame; reduce the difference of cutting tool two angles of wall formation before and after the cutting face of isolation bar on vertically and isolation bar; can also reduce isolation bar thickness or increase the radius of clean-up of cutting tool, all not constitute restriction the utility model protection range with upper type.

Used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present utility model; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims

1. a cavity body filter comprises cavity and isolation bar at least, it is characterized in that, has the opening of end face sealing on described isolation bar sidewall locations, and described opening runs through described isolation bar makes the isolation bar both sides be communicated with.

2. cavity body filter as claimed in claim 1 is characterized in that, has a protuberance on the described isolation bar, and described opening is opened on described protuberance.

3. cavity body filter as claimed in claim 1 is characterized in that, has a recess at described aperture position on the described isolation bar, when described recess is used to use cutting tool to cut described opening, avoids the handle of a knife of cutting tool.

4. cavity body filter as claimed in claim 3, it is characterized in that, described opening is circumferential closed opening, the isolation bar sidewall of described recess both sides is on same plane, when using cutting tool to cut described opening, the rotation axis of cutting tool is as far as possible near described plane, and described recess is used for avoiding the handle of a knife of cutting tool when cutting.

5. cavity body filter as claimed in claim 3, it is characterized in that, described opening is circumferential closed opening, described isolation bar has a recess at described aperture position, the isolation bar sidewall of described recess both sides is on Different Plane, and when using cutting tool to cut described opening, the rotation axis of cutting tool is tried one's best near the intersection on two planes of described recess both sides isolation bar, described recess is used for avoiding the handle of a knife of cutting tool when cutting.

6. as any described cavity body filter of claim 1 to 5, it is characterized in that described opening cutting face longitudinally is a cambered surface, and this cambered surface equates with the angle that isolation bar two side wall is become.