KR101094759B1 - Method for Combining Cover of Radio Frequency Filter and Radio Frequency Filter Produced by the Method - Google Patents

Abstract

Disclosed are a cover combining method of a radio frequency filter and a radio frequency filter by the method. The disclosed filter comprises a housing having at least one protrusion formed thereon; A cover disposed on the housing and having at least one hole corresponding to the protrusion; At least one cavity formed inside the housing, wherein the protrusion is inserted into the hole of the cover to compress the upper part of the cover by press compression while the cover is located above the housing to couple the cover to the housing. Let's do it. According to the disclosed method and the filter by the method, the cover can be coupled to the housing in a shorter time and at a lower cost, and there is an advantage of preventing the deterioration of properties by PIMD.

Filter, cover, combined

Description

Method for Combining Cover of Radio Frequency Filter and Radio Frequency Filter Produced by the Method

The present invention relates to a radio frequency filter, and more particularly, to a method of joining a cover and a housing in a radio frequency filter and a filter manufactured by the method.

A filter is a device for passing only a signal of a specific frequency band among input frequency signals, and has been implemented in various forms. Among the various types of filters, an RF cavity filter in which a cavity and a resonator are formed is mainly used in equipment requiring relatively high power, such as a base station.

1 is an exploded perspective view of a conventional RF cavity filter.

Referring to FIG. 1, a conventional RF cavity filter includes a housing 100, an input connector 102, an output connector 104, a cover 106, a plurality of cavities 108, and a resonator 110.

 The housing 100 protects components such as the resonator 110 inside the filter and serves as a shield for electromagnetic waves. The housing 100 may be formed of a base made of aluminum, and a silver plated housing. RF equipment such as filters and waveguides typically use silver plating with excellent electrical conductivity to minimize losses. In recent years, in addition to improving properties such as corrosion resistance, plating methods other than silver plating may be used, and housings using such plating methods may be used.

The cover 106 is coupled to the housing at the top of the housing and is generally coupled to the housing by bolting. The cover 102 is also made of a metal material and the inside of the filter is electromagnetically shielded.

A plurality of partitions 120 are formed inside the filter, and a plurality of cavities 108 are defined by the housing 100 and the partitions 120.

In addition, each of the plurality of cavities 108 is provided with a resonator 110, the resonator has a cylindrical shape or a disk shape. The resonator may be a dielectric resonator or a metal resonator depending on the mode used by the filter.

Coupling windows 130 are formed in each cavity, and the RF signal travels from one cavity to another through the coupling window 130.

The input connector 102 is a connector to which the RF signal is input, and the output connector 104 is a connector to which the RF signal filtered by the RF cavity filter is output. Although not shown in FIG. 1, the input connector 102 and the output connector 104 may be connected to the resonator through a conductive loop.

In such a conventional RF filter, the housing and the cover are generally joined by bolt coupling. Since the housing and the cover need to be tightly coupled, a plurality of bolts are used to couple the housing and the cover, and the cover and the housing are coupled through the plurality of bolts along the edge of the housing as shown in FIG. 1.

Such bolt coupling is generally made by hand, and since a plurality of bolts are used, the coupling operation of the housing and the cover has a considerable cost and time.

In addition, when the cover and the housing are not closely coupled due to processing tolerances, the filter may be a major cause of the PIMD that may drastically reduce the filter performance.

In order to solve the problems of the prior art as described above, the present invention proposes a method of coupling a cover to a housing in a shorter time and a lower cost, and a radio frequency filter manufactured thereby.

Another object of the present invention is to propose a method of joining a cover and a housing that can prevent degradation of properties by PIMD, and a radio frequency filter manufactured thereby.

Other objects of the present invention may be derived by those skilled in the art through the following examples.

In order to achieve the object as described above, according to an aspect of the present invention, the housing is formed with at least one protrusion on the top; A cover disposed on the housing and having at least one hole corresponding to the protrusion; At least one cavity formed inside the housing, wherein the protrusion is inserted into the hole of the cover to compress the upper part of the cover by press compression while the cover is located above the housing to couple the cover to the housing. A radio frequency filter is provided.

The height of the protrusion is set larger than the thickness of the cover, and the portion protruding above the cover of the protrusion is pressed by the pressing.

The protrusion is formed at the edge of the cover.

At least one partition wall is formed in the housing, the cavity is defined by the housing and the partition wall, at least one protrusion is formed on the partition wall, and the cover has a hole corresponding to the protrusion formed on the partition wall. do.

According to another aspect of the present invention, a method of joining a housing and a cover of a radio frequency filter including a housing, a cover and a cavity formed inside the housing, the method comprising: forming at least one protrusion on an upper portion of the housing; Forming a hole in the cover corresponding to the protrusion (b); Inserting the protrusion into the hole to position the cover on the housing (c); And a step (d) of pressing the upper part of the cover.

According to the present invention, the cover can be coupled to the housing in a shorter time and lower cost, there is an advantage that can prevent the degradation of properties by the PIMD.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the cover coupling method of the radio frequency filter according to the present invention and the radio frequency filter by the method.

2 is an exploded perspective view of the cover and the housing before the radio frequency filter according to an embodiment of the present invention.

Referring to FIG. 2, a radio frequency filter according to a preferred embodiment of the present invention is defined by a housing 200, a cover 202, a plurality of partitions 204 formed inside the housing, a housing and partitions. It may include a plurality of cavities 206 and a plurality of resonators 208, input connectors 210 and output connectors 212 received in each cavity. A plurality of protrusions 250, 252, 254, 256, and 258 are formed on the housing 200 and the partition wall 204. In addition, the cover 202 is formed with holes 260, 262, 264, 266, 268 corresponding to the protrusions 250, 252, 254, 256, and 258.

 The housing 200 protects components such as the resonator 208 inside the filter and serves as a shield for electromagnetic waves. The housing 200 may be formed by forming a base of aluminum and silver-plated housing. RF equipment such as filters and waveguides typically use silver plating with excellent electrical conductivity to minimize losses. In recent years, in addition to improving properties such as corrosion resistance, plating methods other than silver plating may be used, and housings using such plating methods may be used. A plurality of protrusions 250, 252, 254 and 256 are formed at the edge portion of the upper portion of the housing. The protrusions 250, 252, 254, and 256 are preferably in the form of a rectangular parallelepiped, but are not limited thereto. In addition, although the length of the protrusion formed on the edge of the housing is similar to the length of the edge is shown in FIG. 2, the length of the protrusion may be appropriately adjusted by those skilled in the art.

A plurality of partitions 204 are formed inside the housing 200, and the housing and the plurality of partitions 204 define a plurality of cavities 206. Referring to FIG. 2, a protrusion 258 is formed on an upper portion of a partition wall.

Each cavity 206 houses a resonator 208. Although a cylindrical resonator is illustrated in FIG. 2, various types of resonators, such as a disk resonator, may be used.

The material of the resonator 208 may be a metal or a dielectric, and the material of the resonator is selected according to the mode used by the filter. The center frequency of the filter is determined by the size of the cavity, the size of the resonator, and the like.

The input connector 210 is a connector to which an RF signal is input, and the center conductor of the input connector 210 may be coupled to an adjacent resonator through a conductive loop (not shown). The output connector 212 is a connector through which the filtered RF signal is output, and the output connector 212 may also be coupled to an adjacent resonator through a conductive loop (not shown).

The cover 202 is made of a conductive material, and preferably the same material as the housing. The cover is formed with holes 260, 262, 264, 266, and 268 corresponding to the protrusions 250, 252, 254, 256, and 258 formed on the housing or the partition wall. The cover 202 is coupled to the upper portion of the housing 200, wherein the protrusions 250, 252, 254, 256 and 258 are inserted into the holes 260, 262, 264, 266 and 268 formed in the cover. The heights of the protrusions 250, 252, 254, 256, and 258 are set larger than the thickness of the cover 202. The size of the holes 260, 262, 264, 266, 268 corresponds to the size of the protrusions.

2 illustrates a case in which protrusions are formed at both the housing edge and the partition wall, but the protrusions may be formed only at a part of the housing edge.

Meanwhile, a plurality of tuning bolts 270 penetrate the cover 202 and are inserted into the filter. The tuning bolt 270 is a component used to tune the band pass characteristics of the filter. In the cover, a threaded hole for inserting the tuning bolt 270 is formed so that the tuning bolt 270 is inserted into the filter through the hole, and the lower part of the tuning bolt is positioned above the resonator or the coupling window.

The tuning bolt 270 is rotated to adjust its insertion depth and band pass characteristics such as center frequency or bandwidth can be tuned by adjusting the insertion depth of the tuning bolt.

3 is an exploded perspective view of the cover and the housing before the radio frequency filter according to another embodiment of the present invention.

Referring to FIG. 3, in comparison with the embodiment of FIG. 2, protrusions formed on an upper edge of a cover or an upper portion of a partition wall are not continuously but discretely formed. 2 and 3, the protrusion may be formed in various ways.

2 and 3, in the embodiment of the present invention, a plurality of bolt holes are not formed in the cover, and a coupling method by bolt coupling is not used.

For engagement of the cover 202 and the housing 200, the protrusions 250, 252, 254, 256, 258 are primarily inserted into the holes 260, 262, 264, 266, 268 of the cover 202. The cover 202 is positioned above the housing 200.

4 is a view showing a state in which the cover is positioned on the housing in the radio frequency filter according to an embodiment of the present invention.

Referring to FIG. 4, the protrusions 250, 252, 254, 256, and 258 are inserted into holes formed in the cover to position the cover on the housing, and the protrusions 250, 252, 254, 256, and 258 cover the cover 202. Part of the protrusion protrudes over the cover because it is set high relative to the thickness of the hole and the depth of the hole.

According to a preferred embodiment of the present invention, the cover and the projecting protrusions 250, 252, 254, 256, 258 with a strong force using a mechanism such as a press press after placing the cover on the housing as shown in Figure 4 do.

When the compression is made by the strong force as described above, the portion protruding to the upper part of the cover of the protrusion is lowered by the high force and the width of the protrusion is widened. In other words, the protruding portions of the protrusions are pressed by the strong compression, whereby the protrusions are fully engaged with the holes. Thus, the cover 202 is firmly coupled to the housing 200.

5 is a view showing a state in which the cover is coupled to the housing by press compression in the radio frequency filter according to an embodiment of the present invention.

Referring to FIG. 5, a portion projecting from the protrusion to the cover by pressing is pressed, and the protrusion is pushed out to the side, and the protrusion is tightly coupled to the hole.

As shown in Fig. 5, the protrusion is strongly compressed so that the portion protruding over the cover is substantially flush with the cover, so that the cover and the housing are combined.

6 is a flowchart illustrating a method of coupling a housing and a cover in a radio frequency filter according to an embodiment of the present invention.

Referring to FIG. 6, first, at least one protrusion is formed on the housing (step 600). As shown in Figure 2, it is preferable to be formed on the edge of the protrusion housing, it is preferable that a plurality of protrusions are formed for a firm coupling. Furthermore, protrusions may be formed in portions such as partition walls for a more secure coupling.

Along with the formation of the protrusions, the cover forms holes corresponding to the protrusions (step 602). The size of the hole corresponds to the size of the protrusion. On the other hand, the height of the protrusion is set larger than the thickness of the cover.

Once the housing is formed with a protrusion and a corresponding cover, the cover is placed on the housing so that the protrusion is inserted into the hole (step 604).

The cover is placed on top of the housing and press pressed against the cover with a strong force through which the cover and the housing are firmly engaged as the protrusions projecting onto the cover are pressed (step 606).

When the coupling method as described above is used, there is no need to combine bolts by the operator because a plurality of bolts are not used, so that the coupling can be easily performed as compared to the conventional method, the housing is less time and lower cost And a combination of filters can be performed.

In addition, when the cover and the housing are coupled by bolting, there is a problem that performance is deteriorated by PIMD, which frequently occurs in the discontinuous surface, because the bolts, which are different materials, are positioned between the cover and the housing. Since there is no non-combustible asbestos due to different materials, there is an advantage that performance degradation due to PIMD can be improved.

On the other hand, the coupling method of the housing and the cover in the radio frequency filter according to the present invention can also be used for coupling the handled portion other than the housing and cover. For example, the joining method of the present invention may be used when the bottom part is separately joined after forming only the side part of the housing without forming the bottom part with the side part of the housing.

As such, the manner of joining the bottom of the housing may be usefully applied when the housing is formed by extrusion and cutting. In general, the housing is manufactured by a die casting method, but the above-described bonding method may be used after forming a housing without a bottom part by extrusion molding and cutting it to a size.

In this case, a protrusion is formed in the housing, and a groove corresponding to the protrusion is formed in the bottom, and the housing and the bottom may be coupled, and then the housing and the bottom may be coupled by press compression.

The resonator formed inside the housing may be coupled to the bottom of the housing after the bottom and the housing are coupled, and the cover of the housing is also coupled in the same manner. After the housing is manufactured by extrusion molding, a method of separately bonding the bottom part and the cover may be separated plating, and the initial investment cost is less than that of die casting.

1 is an exploded perspective view of a conventional RF cavity filter.

Figure 2 is an exploded perspective view of the cover and the housing before the coupling in the radio frequency filter according to an embodiment of the present invention.

3 is an exploded perspective view of the cover and the housing before the radio frequency filter according to another embodiment of the present invention.

4 is a view showing a state in which the cover is positioned on the housing in the radio frequency filter according to an embodiment of the present invention.

5 is a view showing a state in which the cover is coupled to the housing by press compression in the radio frequency filter according to an embodiment of the present invention.

6 is a flowchart illustrating a method of combining a housing and a cover in a radio frequency filter according to an embodiment of the present invention.

Claims (11)

A housing having at least one protrusion formed thereon; A cover disposed on the housing and having at least one hole corresponding to the protrusion; At least one cavity formed inside the housing, And a protrusion inserted into the hole of the cover to press the cover by press compression to couple the cover to the housing while the cover is positioned above the housing. The method of claim 1, The height of the protrusion is set to be larger than the thickness of the cover, the radio frequency filter, characterized in that the portion projecting to the upper portion of the protrusion is pressed by the pressing. The method of claim 1, And the protrusion is formed at an edge of the housing. The method of claim 1, At least one partition wall is formed in the housing, the cavity is defined by the housing and the partition wall, at least one protrusion is formed on the partition wall, and the cover has a hole corresponding to the protrusion formed on the partition wall. Radio frequency filter, characterized in that. The method of claim 1, And a resonator is accommodated in the cavity. A method of joining a housing and a cover of a radio frequency filter comprising a housing, a cover and a cavity formed inside the housing, (A) forming at least one protrusion on the housing; Forming a hole in the cover corresponding to the protrusion (b); Inserting the protrusion into the hole to position the cover on the housing (c); And (d) pressing the upper part of the cover. The method of claim 6, The height of the protrusion is set to be larger than the thickness of the cover, the method of combining the housing and cover of the radio frequency filter, characterized in that the portion protruding above the cover of the protrusion is pressed by the pressing of the step (d). The method of claim 6, The protrusion is coupled to the housing and cover of the radio frequency filter, characterized in that formed on the edge portion of the housing. The method of claim 6, The housing is a housing without a bottom portion, Forming at least one lower protrusion under the housing; Forming a bottom hole corresponding to the bottom protrusion on a bottom portion to be coupled to the bottom of the housing; And inserting the lower protrusion into the bottom hole to position the bottom under the housing, and then compressing the bottom. 10. The method of claim 9, The housing of which the bottom part is omitted is manufactured by extrusion molding. A radio frequency filter produced by the method of any one of claims 6 to 10.

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