CN116888819A - Cavity filter assembly - Google Patents

Abstract

The present invention relates to a cavity filter assembly, and more particularly, to a cavity filter assembly comprising: a filter body having a cavity as a predetermined space therein; and at least one resonance rod, form the notched part as the protruding surface protruding from above-mentioned filter body bottom surface to above-mentioned cavity side in the above-mentioned cavity in the front end surface in order to tune the frequency in the above-mentioned cavity in parallel with above-mentioned filter body bottom surface, at the same time, form the tuning correction hole that runs through the above-mentioned notched part, the above-mentioned resonance rod can carry on the frequency tuning in the above-mentioned cavity through the notched of the above-mentioned notched part lateral surface outside the above-mentioned filter body, can correct the above-mentioned frequency tuned through the above-mentioned tuning correction hole, thus offer and reduce the overall weight of the aerial apparatus, save the accessory cost and raise the advantage of the productivity of the product.

Description

Cavity filter assembly

Technical Field

The present invention relates to a cavity filter ASSEMBLY (CAVITY FILTER assmbly), and more particularly, to a cavity filter ASSEMBLY capable of reducing the total weight of an antenna device and saving costs.

Background

Generally, an antenna apparatus includes: a main board mounted with a power supply component element and a plurality of Radio Frequency (RF) filters; and an antenna board disposed at a distance from the main board, having a plurality of antenna elements serving as radiating elements mounted on the front surface thereof, and disposed at the front ends of the plurality of radio frequency filters.

Fig. 1 is an exploded perspective view showing a prior art cavity filter assembly and a sectional view taken along line A-A in an assembled state.

The plurality of rf filters are of various kinds, and in particular, a Cavity Filter (Cavity Filter) is one of the most recently used rf filters because it is easy to tune frequencies and assemble a main board.

As shown in fig. 1, the cavity filter 1 includes: the filter body 10 is formed to be long in the longitudinal direction, and has a metallic box shape having a predetermined space (Cavity) C inside; a plurality of resonator setting bosses 15 respectively arranged on the bottom surface of the cavity C of the filter body 10 at intervals; and a plurality of resonators 20 respectively provided on the resonator installation boss 15.

As shown in fig. 1, the cavity filter 1 further includes a filter cover 30 bonded to cover the opening side of the cavity C formed by the filter body 10, and a tuning notch 31 is formed to allow a frequency tuning designer to easily tune the frequency inside the cavity C by a notch on the outside. The tuning and engraving portion 31 formed in the filter cover 30 is formed on the outer side surface of the filter cover 30 by machining so as to be slightly thinner than the thickness of the filter cover 30, and the tuning and engraving hole 35 is formed in the middle portion of the engraving portion 31, so that a frequency tuning designer can easily correct the amount of engraving performed by mistake by using a predetermined insertion tool (not shown).

The plurality of resonators 20 includes: a resonance lever 21; and a tuning bolt 23 for screwing the resonance rod 21 to the resonator setting boss 15 through the inside of the resonance rod 21, and performing a first frequency tuning described later.

The frequency tuning of the cavity filter 1 is performed by adjusting the height of the resonant rod 21 in the cavity C by the tuning bolt 23 of the resonant rod 21 to adjust the distance from the surrounding structure (for example, the filter cover 30), and then the second frequency tuning may be finely adjusted by a predetermined etching tool (not shown) according to the amount of etching of the etching portion 31 of the filter cover 30 provided corresponding to the upper side of each resonator 20 from the outside to the inside.

However, in the cavity filter 1 of the related art, the resonator installation boss 15 must be formed in the filter body 10 in order to install the resonance rod 21, and the manufacturing method of the filter body 10 is limited, and on the other hand, the tuning bolt 23 must be provided, which has a problem that the total weight of the antenna device and the cost of the accessories are increased.

Disclosure of Invention

Technical problem

The present invention has been made to solve the above-described problems, and an object thereof is to provide a cavity filter assembly capable of reducing the total weight of an antenna device.

It is another object of the present invention to provide a cavity filter assembly that can reduce cost by removing a part of the components of the cavity filter assembly.

It is also an object of the present invention to provide a cavity filter assembly capable of manufacturing various parts in various ways to improve productivity of products.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned can be clearly understood by those skilled in the art to which the present invention pertains through the following descriptions.

Solution to the problem

The cavity filter assembly according to an embodiment of the present invention includes: a filter body having a cavity as a predetermined space therein; and at least one resonance rod having a cylindrical shape with one side opened, provided on the filter body, moving from the open side to the other side to allow the other closed side to enter and be positioned inside the filter body, and forming a notch portion as a protruding surface protruding toward the cavity side on the front end surface of the other closed side of the resonance rod so as to be parallel to the bottom surface of the filter body, thereby tuning the frequency in the cavity, and forming a tuning correction hole penetrating the notch portion.

The resonance rod can tune the frequency in the cavity by the etching of the etching part outside the filter body, and the tuned frequency can be corrected by the tuning correction hole.

The tuning of the frequency in the cavity may be performed by deforming the shape of the engraved portion of the resonance rod by engraving the inside of the cavity with an engraving tool inserted from the outside of the filter body to the inside of the resonance rod.

The correction of the tuning of the frequency in the cavity may be performed by a shape-deforming operation by pulling the engraved portion of the resonance rod toward the outside of the cavity by a pulling tool, and the pulling tool may be inserted into the cavity through the tuning correction hole after being inserted from the outside of the filter body toward the inside of the resonance rod.

The cavity filter assembly according to an embodiment of the present invention may further include a filter cover coupled along an edge portion end of the filter body and forming the cavity together with the filter body.

The filter body may have a resonance rod installation hole for installing the resonance rod, and the resonance rod may have a coupling flange formed to be closely coupled to an outer surface of an edge of the resonance rod installation hole.

The tuning correction hole may have a hole shape having a predetermined diameter formed in the center of the engraved portion.

The plurality of cavities may be formed by a partition plate for partially dividing between adjacent ones of the at least one resonant rod or a window having a form in which a part of the partition plate is cut.

The cavity may be defined by the filter body and the filter cover, wherein the filter body is formed into a box shape having one side opened by a molding process, and the filter cover is formed by a pressing process so as to cover one side of the opening of the filter body.

Further, one side of the opening of the filter body may be a portion facing the other side where the at least one resonance rod is provided.

The cavity may be defined by the filter body and the filter cover, wherein the filter body may be manufactured in a flat plate shape by a molding process, and the filter cover may be manufactured in a box shape which is joined along an edge end portion of the filter body and is opened at a portion corresponding to the filter body side by a deep drawing process.

The cavity may be defined by the filter body and one end cap and the other end cap, wherein the filter body is manufactured by an extrusion process so that one end and the other end in the longitudinal direction are opened, and the one end and the other end cap cover respectively cover the one end and the other end in the longitudinal direction of the opening of the filter body.

And, the resonant rod may be manufactured by a deep drawing and stamping process.

The cavity filter assembly according to an embodiment of the present invention includes: a filter body defining a cavity for inducing resonance and forming at least a bottom surface of the cavity, and forming at least one resonance rod arrangement hole penetrating the inside and the outside; a filter cover defining the cavity together with the filter body and shielding an opening in the filter body; and at least one resonance rod provided through the resonance rod installation hole of the filter body so as to occupy a part of the cavity internal space defined by the filter body and the filter cover, wherein frequency tuning is achieved by deformation of a front end protruding surface inside the cavity.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the cavity filter assembly of the embodiment of the invention, the following effects can be achieved:

first, since the fixing bolts and the resonator installation bosses, which are main structural elements of the conventional cavity filter, can be eliminated, the total weight of the antenna device and the cost of accessories can be reduced.

Second, the form of the filter body can be simplified, and thus, diversification of the manufacturing modes of the filter cover and the resonator including the filter body can be pursued, with the effect of improving the productivity of the product.

Drawings

Fig. 1 is an exploded perspective view showing a prior art cavity filter assembly and a sectional view taken along line A-A in an assembled state.

Fig. 2 is a bottom perspective view and a top perspective view showing a cavity filter assembly according to a first embodiment of the present invention.

Fig. 3 is an exploded perspective view showing a separated state of the filter cover in the structure of fig. 2.

Fig. 4 is an exploded perspective view for explaining coupling achieved by the cavity filter assembly of the first embodiment of the present invention.

Fig. 5 is a cut-away perspective view for explaining the input-side notch bar and the output-side notch bar in the structure of fig. 4.

Fig. 6a and 6b are a top exploded perspective view and a bottom exploded perspective view showing a state in which the filter cover and the resonance rod are separated in the structure of fig. 2.

Fig. 7 is a vertical sectional view and a partial enlarged view of fig. 2.

Fig. 8 is a vertical cross-sectional cutaway and partially enlarged view of fig. 2.

Fig. 9a and 9b are respective exploded perspective views and cross-sectional views of a cavity filter assembly according to a second embodiment and a third embodiment of the present invention.

Description of the reference numerals

100: cavity filter assembly 110: filter body

111a: input connector 111b: output connector

Detailed Description

Hereinafter, embodiments of the cavity filter assembly according to the present invention will be described in detail with reference to the accompanying drawings.

Note that, in the case where reference numerals are given to constituent elements in the respective drawings, the same reference numerals are given to the same constituent elements as much as possible even if they appear in different drawings. In the process of describing the embodiments of the present invention, if it is determined that specific descriptions of the related known structures or functions interfere with understanding the embodiments of the present invention, detailed descriptions thereof will be omitted.

In describing the structural elements of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. Such terms are used only to distinguish the structural element from other structural elements, and are not intended to limit the nature, sequence, order, etc. of the structural element by the terms. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms as defined by a dictionary commonly used should be understood to have the same meaning as the related art has on the text, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

Fig. 2 is a bottom perspective view and a top perspective view showing a cavity filter assembly according to a first embodiment of the present invention, fig. 3 is an exploded perspective view showing a state in which a filter cover is separated in the structure of fig. 2, fig. 4 is an exploded perspective view for explaining coupling by the cavity filter assembly according to the first embodiment of the present invention, and fig. 5 is a cut-away perspective view for explaining a notch bar on an input side and a notch bar on an output side in the structure of fig. 4. Fig. 6a and 6b are a top exploded perspective view and a bottom exploded perspective view showing a state in which the filter cover and the resonance rod are separated in the structure of fig. 2.

Referring to fig. 2 to 6b, a cavity filter assembly 100 according to a first embodiment of the present invention may include: a filter body 110 having a cavity C therein with a predetermined space; and at least one resonance rod 120 configured to filter frequencies within the cavity C of the filter body 110.

At least one of the resonant rods 120 may have a cylindrical shape with one side opened, and may be disposed on the filter body 110 such that the other side closed is accessible and positioned inside the filter body 110. However, the outer shape of the resonance rod 120 is not limited to a complete cylindrical shape, and includes a cylindrical shape having a diameter gradually decreasing toward the other side of the closure. In this case, the diameter of the open side of the resonance bar 120 may be larger than the diameter of the closed other side (the engraved portion 124 described later).

On the other hand, referring to fig. 2 to 4, the cavity C of the cavity filter assembly 100 of the first embodiment of the present invention may be understood as a space defined by the filter body 110 and the filter cover 130, the filter body 110 being manufactured in a box shape having one side opened by a molding process, the filter cover 130 being manufactured by a punching process in such a manner as to cover one side of the opening of the filter body 110. However, as described in the second and third embodiments described later, the cavity C may be defined differently from the cavity filter assembly 100 of the first embodiment.

The cavity C may be provided inside the filter body 110 in a plurality, generally divided in a number corresponding to the number of the plurality of resonance rods 120.

In more detail, referring to fig. 3, in the cavity filter assembly 100 of the first embodiment of the present invention, 7 resonance rods 120 may be provided in the cavity C of the filter body 110. The 7 resonant rods 120 are formed as follows: the coupling characteristic is achieved in the course of transmitting the electric signal supplied from the input connector 111a of one side to the adjacent resonant lever 120, and at the same time, the electric signal is output through the output connector 111b of the other side.

The coupling characteristic between the resonant rods 120 in the cavity C may be achieved as follows: the frequency band of the frequency to be filtered is finely adjusted by the partition plates 113 formed in such a manner as to divide the cavity C into the same number as the number of the resonance rods 120 and the window 114 having a form of cutting a portion of the partition plates 113.

Referring to fig. 3 and 4, in the cavity filter assembly 100 according to the first embodiment of the present invention, the filter body 110 has a rectangular parallelepiped shape formed long in the longitudinal direction, 7 cavities C are formed inside by the partition 113 and the window 114 formed integrally (or separately manufactured), and the 7 resonant rods 120, 120a to 120g are arranged in the divided cavities C to perform a function as 7 resonators.

The filter body 110 described above may be manufactured by a molding process. The molding material of the filter body 110 may include a non-conductive resin material such as plastic. However, in order to realize coupling characteristics according to an electric signal or the like in the cavity C, the filter body 110 may be entirely shielded from electromagnetic waves between the cavity C and the outside by coating a film of a metal material on the inner side surface forming the cavity C.

On the other hand, a plurality of resonance rod installation holes 115 having a circular shape may be formed in the filter body 110 so that the plurality of resonance rods 120 are inserted into the cavity C from the outside of the bottom surface of the cavity C facing the opening side. The plurality of resonance lever installation holes 115 may be formed to have a height difference so that edge portions of the resonance lever 120 are engaged with each other.

In addition, referring to fig. 3, for frequency tuning in the cavity C, the front end surface of the resonant rod 120 may protrude from the bottom surface of the filter body 110 toward the cavity C (more preferably, toward the opening of the filter body 110) so as to be parallel to the bottom surface of the filter body 110 in the cavity C, thereby forming a notch 124 as a protruding surface.

The resonance rod 120 is formed in a substantially cylindrical shape that is opened to the outside (one side) of the filter body 110, and when inserted through the resonance rod installation hole 115 of the filter body 110, the empty inside may be located inside the cavity C, and the edge end portion of the resonance rod 120 on the opening side may be closely coupled with the resonance rod installation hole 115 formed to have a height difference.

For this, a coupling flange 127 may be formed at the resonance lever 120 to be closely coupled with an outer face of the edge of the resonance lever arrangement hole 115 formed in a manner having a height difference. The coupling flange 127 and the resonance lever arrangement hole 115 may be tightly coupled in various manners, and typically, may also be tightly coupled by welding coupling using a welding material.

The engraved portion 124 may have the following structure: when the filter body 110 is inserted from the outside through the hollow interior of the resonance rod 120 by an unillustrated engraving tool and then engraved with a predetermined external force, the frequency tuning in the cavity C can be performed by an operation of engraving the cavity C to deform the shape. That is, the second frequency tuning within the cavity C may be performed according to the amount of scoring of the score 124.

On the other hand, referring to fig. 3, the resonance lever 120 may further form a tuning correction hole 125 penetrating the engraved portion 124.

Tuning correction holes 125 can be formed as follows: when the shape of the engraved portion 124 is deformed by engraving the inside of the cavity C with the engraving tool, the tuned frequency tuning state can be corrected by adjusting the engraving amount with a Pulling (pushing) tool (not shown) of the opposite concept to the engraving tool, in the case where the frequency tuning needs to be corrected. Tuning correction holes 125 may be formed in a hole pattern having a prescribed diameter at the center of the engraved portion 124. From the standpoint that the horizontal area of the engraved portion 124 is required to have the minimum area required for frequency tuning, the tuning correction hole 125 is preferably sized to ensure that the area of the engraved portion 124 is larger than the minimum area.

In more detail, when the pull tool, which is not shown, is formed in a structure that protrudes to the cavity C side through the tuning-correction hole 125 and is caught at the cavity C side edge portion of the tuning-correction hole 125, and is pulled to the outside (i.e., in the direction of the open side of the resonance lever 120), the engraved portion 124, which is deformed in shape to the inside of the cavity C by being engraved by the engraving tool, can be pulled back to the original position, thereby performing correction in the direction in which the amount of engraving is reduced, and performing correction of frequency tuning.

On the other hand, as described above, the cavity filter assembly 100 of the first embodiment of the present invention may further include the filter cover 130 formed to cover one side of the opening of the filter body 110 (the other side of the closing of the resonance rod 120 when the resonance rod 120 is the reference).

Unlike the filter body 110, the filter cover 130 may be manufactured through a stamping process. For this, the filter cover 130 may be formed of a metal material. However, the method of manufacturing the filter body 110 is not limited to the press process. The filter cover 130 may be manufactured by a molding process, in which case it may include a plastic resin molding material, and in which case it may be formed by coating a film made of a metal material for shielding electromagnetic waves between the inside and the outside of the cavity C, in the same manner as the filter body 110.

That is, referring to fig. 6a and 6b, the filter cover 130 is coupled to cover the opening side of the filter body 110, thereby defining the inner space of the cavity C for realizing the frequency characteristic (i.e., coupling characteristic), and plays a role of shielding electromagnetic waves together with the filter body 110 to minimize the influence of the external electromagnetic wave environment.

The electric signal inputted through the input connector 111a is frequency-filtered when passing through the plurality of resonant rods 120a to 120g which are sequentially arranged in the filter body 110 and are spaced apart in a straight line direction, and then outputted through the output connector 111 b.

However, when the resonator rods 120a to 120g are aligned in a straight line in one direction as in the cavity filter assembly 100 according to the first embodiment of the present invention, although the adjacent coupling between the adjacent resonator rods can be smoothly achieved, it is difficult to achieve cross coupling for forming a specific Notch (Notch) on the left and right of the copper strap. This is because cross coupling is generally achieved by bypassing the resonant rods of one or more adjacent resonant rods (or cavities) to the input electric signal, but such structural design is difficult when the resonant rods 120a to 120g (or cavities) are arranged long and long in a straight line.

Therefore, referring to fig. 4 and 5, the formation position of the input connector 111a of the cavity filter assembly 100 of the first embodiment of the present invention is designed at a position between the first resonant rod 120a as the front-end resonator and the second resonant rod 120b adjacent thereto, and the formation position of the output connector 111b is designed at a position between the seventh resonant rod 120g as the end resonator and the sixth resonant rod 120f adjacent thereto. The front ends of the input connector 111a and the output connector 111b may protrude to the inside of the cavity C through an input port hole (reference numeral not shown) and an output port hole (reference numeral not shown), respectively.

Further, referring to fig. 4 and 5, the cavity filter assembly 100 according to the first embodiment of the present invention may include: an input-side metal notch bar 141 electrically connected to the input connector 111a, one end of which is located in a cavity corresponding to the first resonant bar 120a and the other end of which is located in a cavity corresponding to the second resonant bar 120 b; and an output-side metal notch bar 142 having one end located in a cavity corresponding to the seventh resonant bar 120g and the other end located in a cavity corresponding to the sixth resonant bar 120 f.

The input-side metal Notch bar 141 may cause an electric signal input through the input connector 111a to pass through 1 first resonant bar 120a to the second resonant bar 120b to achieve cross-coupling, thereby forming a specific Notch (more specifically, referred to as L-Notch) at the right-side end of the passband, and the output-side metal Notch bar 142 may cause an electric signal via the sixth resonant bar 120f to pass through 1 seventh resonant bar 120f to output to the output connector 111b to achieve cross-coupling, thereby forming a specific Notch (more specifically, referred to as C-Notch) at the left-side end of the passband.

In this case, the input side metal Notch bar 141 may be shortened (short) to be in direct contact with the structure in the cavity C, thereby forming the L-Notch at the right side end of the passband as described above, and conversely, referring to fig. 4 and 5, the output side metal Notch bar 142 is provided in an Open (Open) manner using the teflon block 143 having an insulator material as a medium to avoid direct contact with the structure of the cavity C, thereby forming the C-Notch at the left side end of the passband.

Fig. 7 is a vertical sectional view of fig. 2 and a partially enlarged view thereof, and fig. 8 is a vertical sectional view of fig. 2 and a partially enlarged view thereof.

Referring to fig. 7 and 8, in the cavity filter assembly 100 according to the first embodiment of the present invention, a plurality of resonance rods 120 are inserted into the cavity C defined by the filter body 110 and the filter cover 130, and the etching amount of the etching portion 124 is adjusted by inserting an etching tool into the empty inner space of the resonance rods 120, thereby performing frequency tuning in the cavity C. In this case, the plurality of resonance rods 120 are provided so that the respective coupling flanges 127 are coupled to the outer edge ends of the plurality of resonance rod installation holes 115 formed in the filter body 110, and the engraving portion 124 may be engraved by an engraving tool through the opened portion as the cylindrical shape opened to one side is formed.

The cavity filter assembly 100 according to the first embodiment of the present invention is formed such that the frequency tuning in the cavity C is performed by the shape deformation of the resonant rod 120 itself, unlike the conventional cavity filter assembly 1 shown in fig. 1, and the resonant rod installation boss (see reference numeral 15 of fig. 1) for installing the resonant rod (see reference numeral 21 of fig. 1) can be eliminated and the tuning bolt 23 can be eliminated, so that not only the variety of manufacturing methods of the filter body 110 but also the total manufacturing cost can be reduced.

In view of the advantages of the manufacturing method, for example, as shown in fig. 1, in the case where the filter body 10 is integrally formed with the resonance lever installation boss (refer to reference numeral 15 of fig. 1), the manufacturing method of the filter body 10 can only be a molding process, and the manufacturing by the extrusion process or the pressing process is limited due to the shape of the resonance lever installation boss 15.

Further, unlike the structure of the cavity filter assembly 1 of the related art shown in fig. 1 in which the filter cover 30 is integrally formed with the notch 31 for frequency tuning in the cavity C, the cavity filter assembly 100 of the first embodiment of the present invention is provided with the notch 124 in the resonance rod 120, and frequency tuning can be performed by deforming the shape of the notch 124 of the resonance rod 120 completely independent of the filter cover 130, and in this respect, it is also possible to achieve a variety of manufacturing modes of the filter cover 130. That is, the notch portion 31 for frequency tuning is not formed in the filter cover 130, and only the function of shielding the cavity C is exhibited, whereby the shape of the filter cover 130 can be simplified and the manufacturing modes can be diversified.

In more detail, as shown in fig. 1, in the case where the engraved portion 31 is formed in the filter cover 30, it is limited to manufacturing by a molding process, but in the case where the engraved portion 31 is removed from the filter cover 30, the filter cover 130 may be manufactured by an extrusion process (refer to the third embodiment of the present invention) or a deep drawing press process (including a general press process as well) (refer to the second embodiment of the present invention).

On the other hand, referring to fig. 2 to 8, the resonance rod 120 of the cavity filter assembly 100 of the first embodiment of the present invention may be manufactured by a deep drawing stamping process. As is well known, the deep drawing stamping process is an advantageous process for manufacturing a cylindrical (or rectangular parallelepiped) shaped article with only one open side using a punching tool after placing a plate on a die.

Fig. 9a and 9b are respective exploded perspective views and cross-sectional views of a cavity filter assembly according to a second embodiment and a third embodiment of the present invention.

As shown in fig. 2 to 8, the cavity C for realizing the substantial frequency characteristic of the cavity filter assembly 100 according to the first embodiment of the present invention is substantially defined by the filter body 110 in a form of one side opening and the filter cover 130 coupled in a manner of covering one side of the opening of the filter body 110, but the cavity C is not limited to the manner defined according to the first embodiment.

That is, as shown in the second embodiment of the present invention with reference to fig. 9a, the cavity C may be defined by the filter body 110a and the filter cover 130a, the filter body 110a may be manufactured in a flat plate shape through a molding process, and the filter cover 130a may be manufactured in a box shape which is coupled along an edge end portion of the filter body 110a and is opened at a portion corresponding to the side of the filter body 110a through a deep drawing process. Since the filter cover 130a can be manufactured through a deep drawing and pressing process, productivity of a product can be greatly improved.

Further, as shown in the third embodiment of the present invention with reference to fig. 9b, the cavity C may be defined by the filter body 110b, one end cap 110b-1 and the other end cap 110b-2, wherein the filter body 110b is manufactured by an extrusion process in such a manner that one end portion and the other end portion in the longitudinal direction are opened, and the one end cap 110b-1 and the other end cap 110b-2 cover the one end portion and the other end portion in the longitudinal direction of the opening of the filter body 110b, respectively. Compared with the cavity filter assembly 100 of the first embodiment, since the filter cover 130 itself covering one side of the opening of the cavity C can be substantially removed and the filter cover 110b can be simply manufactured through the extrusion process, productivity of the product can be greatly improved.

Also, in comparison with the prior art, the cavity filter assembly 100 of the first to third embodiments of the present invention constructed as described above does not require the use of the tuning bolt 23 to fix the resonance rod 21 or to perform the first frequency tuning, and therefore, the tuning bolt 23 is not required at all, and a part of the fitting structure can be removed. As described above, since a part of the fitting structure can be removed, the effect of saving the product cost can also be achieved by saving the fitting cost.

As described above, the cavity filter assemblies of the first to third embodiments of the present invention can be defined as follows.

That is, the cavity filter assembly of the embodiment of the present invention may be defined by a structure including: a filter body 110 defining a cavity C causing resonance and forming at least a bottom surface of the cavity C, and forming at least one resonance rod arrangement hole 115 penetrating the inside and outside; a filter cover 130 defining a cavity C together with the filter body 110, shielding an opening portion in the filter body 110; and at least one resonance rod 120 provided through the resonance rod installation hole 115 of the filter body 110 in such a manner as to occupy a part of the inner space of the cavity C defined by the filter body 110 and the filter cover 130, and frequency tuning is achieved by deformation of the front end protruding surface (such as the engraved portion 124) inside the cavity C.

In the case of the prior art, the frequency tuning in the cavity C is performed by changing the shape of the tuning notch formed in the filter cover and the tuning bolt, as compared with the cavity filter assembly of the prior art (see fig. 1 and "background art"), but the frequency tuning in the cavity C according to the embodiment of the present invention is performed by changing only the front end protruding surface (notch 124) of the resonant rod 120, which is different from the frequency tuning method of the prior art.

Embodiments of the cavity filter assembly according to the present invention are described in detail above with reference to the drawings. The embodiments of the present invention are not limited to the above-described embodiments, but it is apparent that those skilled in the art to which the present invention pertains can implement various modifications and various embodiments within the equivalent scope. The true scope of the invention should therefore be defined by the appended claims.

Industrial applicability

The invention provides a cavity filter assembly, which reduces the total weight of antenna equipment and the cost of accessories by removing fixing bolts and resonator installation bosses which are main structural elements of the existing cavity filter, and improves the productivity of products by simplifying the form of a filter body and pursuing the diversification of manufacturing modes of a filter cover and a resonator comprising the filter body.

Claims (14)

1. A cavity filter assembly is characterized in that,

comprising the following steps:

a filter body having a cavity as a predetermined space therein; and

at least one resonance rod with one side opened cylinder shape and set in the filter body to move from one side to the other side to make the other side enter and locate inside the filter body,

a notch portion as a projection surface projecting toward the cavity side is formed in parallel with the bottom surface of the filter body on the other closed side front end surface of the resonance lever to tune the frequency in the cavity, and a tuning correction hole penetrating the notch portion is formed.

2. The cavity filter assembly according to claim 1, wherein the resonance rod is capable of tuning a frequency in the cavity by the engraving of the engraving portion on the outside of the filter body, and the tuned frequency is capable of being corrected by the tuning correction hole.

3. The cavity filter assembly according to claim 1, wherein the frequency in the cavity is tuned to be deformed by a carving tool inserted from an outside of the filter body to an inside of the resonance rod to carve a carved portion of the resonance rod into the cavity.

4. A cavity filter assembly according to claim 3, wherein the frequency tuning in the cavity is corrected by a shape deformation operation by pulling the engraved portion of the resonance rod toward the outside of the cavity by a pulling tool, and the pulling tool is inserted into the cavity through the tuning correction hole after being inserted from the outside of the filter body toward the inside of the resonance rod.

5. The cavity filter assembly of claim 1, further comprising a filter cover joined along an edge portion end of said filter body and forming said cavity with said filter body.

6. The cavity filter assembly of claim 1, wherein the cavity filter assembly comprises a plurality of filters,

a resonance bar setting hole for setting the resonance bar is formed on the filter body,

and forming a coupling flange on the resonance rod, which is tightly coupled with the outer surface of the edge of the resonance rod installation hole.

7. The cavity filter assembly according to claim 1, wherein the tuning correction hole has a hole pattern having a predetermined diameter formed in a center of the engraved portion.

8. The cavity filter assembly according to claim 1, wherein the plurality of cavities are formed by a partition plate for partially dividing between adjacent ones of the at least one resonance rod or a window having a form of cutting a portion of the partition plate.

9. The cavity filter assembly according to claim 1, wherein the cavity is defined by the filter body and the filter cover, the filter body is manufactured in a box shape having one side opened by a molding process, and the filter cover is manufactured by a punching process so as to cover one side of the opening of the filter body.

10. The cavity filter assembly according to claim 9, wherein one side of the opening of the filter body is a portion facing the other side on which the at least one resonance rod is provided.

11. The cavity filter assembly according to claim 1, wherein the cavity is defined by the filter body and the filter cover, the filter body is manufactured in a flat plate shape by a molding process, and the filter cover is manufactured in a box shape which is joined along an edge end portion of the filter body and is opened at a portion corresponding to the filter body side by a deep drawing process.

12. The cavity filter assembly according to claim 1, wherein the cavity is defined by the filter body, a one-side end cap and a other-side end cap, the filter body being manufactured by an extrusion process with one end portion and the other end portion in a longitudinal direction being opened, the one-side end cap and the other end cap covering one end portion and the other end portion in the longitudinal direction of the opening of the filter body, respectively.

13. A cavity filter assembly according to any of claims 9-12, wherein said resonator rod is manufactured by a deep drawing stamping process.

14. A cavity filter assembly, comprising:

a filter body defining a cavity for inducing resonance, at least forming a bottom surface of the cavity, and forming at least one resonance rod arrangement hole penetrating the inside and the outside;

a filter cover defining the cavity together with the filter body and shielding an opening in the filter body; and

at least one resonance rod provided through the resonance rod installation hole of the filter body so as to occupy a part of the space inside the cavity defined by the filter body and the filter cover, and frequency tuning is achieved by deformation of the front end protruding surface inside the cavity.