Communications equipment filters

Abstract

A filter for communication devices is provided that can minimize the insertion loss within a cavity. [Solution] A filter for a communication device includes a cavity that is a dielectric-filled space, the cavity including a filter body with an open bottom, a lower cover panel made of a first material coupled to the filter body to cover the open bottom, and a resonator frame made of a second material coupled to the lower cover panel and including a plurality of resonator bars extending a predetermined length toward an upper surface of the filter body. The resonator frame has a lower end that is press-fitted into a plurality of mating through-holes that are formed in the lower cover panel to penetrate the cavity and are arranged in two or more rows in the width direction and spaced apart in the longitudinal direction, and is then fixed inside the cavity by soldering around the mating through-holes.

Description

[Technical Field]

[0001] The present invention relates to a filter for a communication device, and more particularly to a filter for a communication device in which a filter body forming a cavity is manufactured by a deep drawing press process, and a resonator frame made of a different material is tightly fitted and soldered to a lower cover panel made of the same material that shields one open side of the cavity, thereby minimizing insertion loss within the cavity. [Background technology]

[0002] Radio frequency devices (including all "communications devices") such as radio frequency filters are typically constructed with a structure in which multiple resonators are connected. Such resonators are circuit elements that resonate at a specific frequency by combining an inductor (L) and a capacitor (C) in an equivalent electronic circuit. Each resonator has a structure in which a dielectric resonance element (DR) or a metal resonance element is provided inside a cavity such as a metallic cylinder or rectangular parallelepiped surrounded by a conductor. As a result, each resonator has a structure that enables high-frequency resonance by allowing only an electromagnetic field of a natural frequency according to the processing frequency band to exist within the cavity. Typically, multiple resonant ends are formed using multiple cavities, and a multi-stage structure is formed in which the multiple resonant ends are connected in sequence.

[0003] An example of a radio frequency filter having a multiple cavity structure is disclosed in Korean Patent Publication No. 10-2004-0100084 (title: "Radio Frequency Filter", publication date: December 2, 2004), which was filed earlier by the applicant of the present application.

[0004] However, in conventional radio frequency filters, each resonator extends in the thickness direction within the cavity, and the frequency is tuned by adjusting the distance between the resonator and the cavity by deforming a part of the filter tuning cover that covers the cavity using a stamping method to achieve desired bandpass characteristics. This means that there is a significant limitation in reducing the size of the completed filter in the thickness direction.

[0005] Furthermore, conventional radio frequency filters require the installation of additional conductive material structures to realize inductive or capacitive coupling in order to enhance skirt characteristics between adjacent resonators or between distant resonators in multiple cavities, which has been pointed out as a problem in that the weight of the completed filter increases significantly.

[0006] Meanwhile, in recent years, in antenna devices to which Massive MIMO (Multiple Input-Multiple Output) technology is applied, research is being conducted to minimize the thickness of internal components such as filters in order to slim down the entire product, and the most commonly used type of filter for this purpose is a dielectric ceramic filter.

[0007] However, due to the characteristics of the material, dielectric ceramic filters have the problem that the manufacturing method for the filter body is limited to a molding method, which reduces productivity, and that the cavity shape must be manufactured in advance according to the design value of the final frequency, which in turn reduces the variability of frequency tuning design.

[0008] On the other hand, when a copper panel is used as the filter material, various manufacturing methods such as a press die method can be used, which has the advantage of preventing the above-mentioned decrease in productivity. However, if the filter body and the resonator, which is the resonance element installed inside the cavity, are made of different materials, a welding method is used in the joining process, which can lead to a problem of large insertion loss. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made to solve the above-mentioned technical problems, and aims to provide a filter for a communication device in which a filter body forming a cavity is manufactured by a deep drawing press process, and a resonator frame made of a different material is tightly fitted and soldered to a lower cover panel made of the same material that shields one open side of the cavity, thereby minimizing insertion loss within the cavity. [Means for solving the problem]

[0010] A filter for a communication device according to one embodiment of the present invention includes a cavity that is a dielectric-filled space. The cavity includes a filter body having an open bottom, a lower cover panel made of a first material coupled to the filter body to cover the open bottom, and a resonator frame made of a second material coupled to the lower cover panel and including a plurality of resonator bars extending a predetermined length toward an upper surface of the filter body. The resonator frame has a lower end that is press-fitted into a plurality of mating through holes that are formed in the lower cover panel to penetrate the interior and exterior of the cavity and are spaced apart in the longitudinal direction and arranged in two or more widthwise rows. The resonator frame is then fixed inside the cavity by soldering around the mating through holes.

[0011] Here, the resonator frames may be provided in a number corresponding to the number of rows of the plurality of fitting through holes formed in the lower cover panel, and the plurality of resonator bars may be arranged at predetermined intervals in the longitudinal direction of the filter body so as not to overlap with each other in the width direction of the filter body.

[0012] The resonator frame may also be provided with a notch forming portion in which notch bars are formed on both sides of any one of the plurality of resonator bars arranged sequentially in the longitudinal direction of the filter body, the notch bars extending a predetermined distance from each other perpendicular to the direction in which the resonator bars are positioned.

[0013] The notch forming portion may include a C-notch portion where the notch bars are not interconnected and an L-notch portion where the notch bars are interconnected, and the C-notch portion may be formed at a position where the notch bars are relatively closer to the top surface of the filter body among the plurality of resonating bars than the L-notch portion.

[0014] Also, the filter body and the lower cover panel may be made of the same material, the first material may be a copper material, and the second material may be a conductive material other than the copper material.

[0015] In addition, the upper surface of the filter body may be provided with a plurality of tuning embossing surfaces, each provided at a position directly above the plurality of resonating bars, for adjusting the fine frequency by adjusting the distance from the plurality of resonating bars using an embossing method.

[0016] In addition, the plurality of tuning engraved surfaces may be formed to a thickness smaller than the thickness of the upper surface of the filter body, with both longitudinal ends integrally connected to the upper surface of the filter body and both widthwise ends formed by incisions in the upper surface of the filter body.

[0017] In addition, the upper surface of the filter body may be provided with a plurality of coupling adjustment surfaces, each of which is provided at a position corresponding to a gap between adjacent ones of the plurality of resonant bars and which change a coupling value between the adjacent resonant bars by deforming and protruding into the cavity by a stamping method.

[0018] In addition, the plurality of coupling adjustment surfaces may be formed to a thickness smaller than the thickness of the upper surface of the filter body, and either one of both longitudinal ends or both width ends may be formed by cutting into the upper surface of the filter body.

[0019] The filter body can be manufactured by a deep drawing press method so that a joining portion that is in surface contact with the edge of the lower cover panel is formed.

[0020] The resonator frame includes a plurality of resonator bars arranged in two widthwise rows of the cavity and spaced a predetermined distance apart in the longitudinal direction, resonator connecting bars each having a resonator coupling end inserted into a plurality of through-holes of the lower cover panel, and resonance characteristic ends formed at distal ends of the resonator bars. Lower ends of the resonator coupling ends, which are exposed to the outside after passing through the through-holes of the lower cover panel, can be soldered from the outside of the lower cover panel. [Effects of the Invention]

[0021] A filter for a communication device according to an embodiment of the present invention has an effect of improving the reliability of the communication device by coupling a filter body and a resonator frame, which is a structure within a cavity and is made of a different material, with a minimum insertion loss. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a bottom perspective view of a filter for a communication device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a top perspective view of FIG. [Figure 3] FIG. 2 is an exploded perspective view of FIG. 1. [Figure 4] FIG. 3 is an exploded perspective view of FIG. 2. [Figure 5] FIG. 2 is a cutaway perspective view of the configuration of FIG. 1, with a portion cut away to reveal a cavity. [Figure 6] 2 is a vertical cross-sectional view taken along line AA in FIG. 1, and a partially enlarged view showing the manner in which the mounting panel of the filter body is connected to the lower cover panel and the manner in which the lower cover panel is connected to the resonator frame. [Figure 7] FIG. 2 is a horizontal cross-sectional view taken along line BB in FIG. [Figure 8] 2 is a vertical cross-sectional view taken along line AA in FIG. 1 and a partially enlarged view showing a coupling adjustment bar in the configuration thereof. [Figure 9]2 is a vertical cross-sectional view taken along line AA in FIG. 1, and a partially enlarged view showing the tuning marking surface of the configuration. [Figure 10] 2A is a plan view of FIG. 1, FIG. 2B is a plan view of the resonator frame, and FIG. 2C is a perspective plan view of the inside. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A filter for a communication device according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] When assigning reference numerals to components in each drawing, it should be noted that the same components are assigned the same numerals as much as possible even if they are displayed in different drawings. Furthermore, when describing the embodiments of the present invention, if it is determined that a detailed description of such well-known configurations or functions would hinder understanding of the embodiments of the present invention, the detailed description will be omitted.

[0025] When describing components of embodiments of the present invention, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are merely used to distinguish the component from other components and do not limit the nature, order, or procedure of the components. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0026] FIG. 1 is a bottom perspective view of a filter for a communication device according to one embodiment of the present invention, FIG. 2 is a top perspective view of FIG. 1, FIG. 3 is an exploded perspective view of FIG. 1, FIG. 4 is an exploded perspective view of FIG. 2, and FIG. 5 is a cutaway perspective view of the configuration of FIG. 1, with a portion cut away to reveal a cavity.

[0027] As shown in FIGS. 1 to 5 , a filter for a communication device according to one embodiment of the present invention includes a filter body 105 having a cavity C that is a dielectric-filled space and an open bottom of the cavity C, a lower cover panel 300 that is coupled to the filter body 105 to cover the bottom of the open cavity C, and a resonator frame 200 that is coupled to the lower cover panel 300 and includes a plurality of resonator bars 220 that extend a predetermined length toward the upper surface within the cavity C of the filter body 105.

[0028] Here, the filter body 105 and the lower cover panel 300, which substantially form the inner surfaces of the cavity C, may be formed of a metal panel member of the same first material. The first material adopted for the metal panel member of the filter body 105 and the lower cover panel 300 may be a copper material with excellent conductivity.

[0029] As shown in Figures 1 to 5, the filter body 105 includes a mounting frame panel 110 that is bent perpendicularly at the bottom edge of the open cavity C of the filter body 105 and extends outward, a one-side thickness forming panel 120 and an other-side thickness forming panel 130 that extend in the thickness direction of the cavity C as one widthwise end and the other widthwise end of the cavity C, an upper body forming panel 150 that forms the upper part of the cavity C, and a one-side shielding panel 180A and an other-side shielding panel 180B that shield the open portions on one and the other longitudinal sides of the cavity C.

[0030] In order to more clearly understand the filter 100 for a communication device according to one embodiment of the present invention, the terms related to "direction" and "position" used in the detailed description of the present invention may be defined as follows:

[0031] In other words, the "longitudinal direction" is defined as the direction that passes through between the two ends, which are relatively longer than the width or thickness, and is perpendicular to the one-side shielding panel 180A and the other-side shielding panel 180B; the "width direction" is defined as the direction that passes perpendicular to the one-side thickness-forming panel 120 and the other-side thickness-forming panel 130; and the "thickness direction" is defined as the direction that passes perpendicular to the body upper forming panel 150 and the lower cover panel 300.

[0032] Meanwhile, the lower cover panel 300 is formed to a size corresponding to the edge of the mounting frame panel 110, which is one of the components of the filter body 105, and the edge of the lower cover panel 300 can be joined to the edge of the mounting frame panel 110 using a surface joining method.

[0033] More specifically, the lower surface of the mounting frame panel 110 forming the edge of the filter body 105 can be flush-fitted with the upper surface of the edge of the lower cover panel 300 .

[0034] At this time, the surface joining between the mounting frame panel 110 of the filter body 105 and the edge of the lower cover panel 300 can be performed by welding, and preferably by soldering using the SMT method.

[0035] Here, assuming that the above-mentioned filter body 105 and lower cover panel 300 are manufactured by a press method using a plate mold, the cavity C may be formed to be long in the left-right longitudinal direction and to have a rectangular parallelepiped shape whose front-to-back width is smaller than its vertical height.

[0036] When multiple filter bodies 105 having cavities C of this shape are placed in a box-shaped antenna housing main body (not shown) that is open at the front, if the body upper forming panel 150 forms the front surface and the one-side thickness forming panel 120 and the other-side thickness forming panel 130 form the left and right sides, it is possible to advantageously install multiple rows of filter bodies 105 in the left and right direction in the installation space of the antenna housing main body.

[0037] In addition, when the upper body forming panel 150 and the lower cover panel 300 are arranged to form the left and right sides, respectively, and the one side shielding panel 180A and the other side shielding panel 180B are arranged to form the top or bottom surface in the installation space of the antenna housing body, it provides the advantage that multiple filter bodies 105 can be installed slimly in the front and back without occupying a large amount of space in the front-to-back direction within the installation space of the antenna housing body.

[0038] 3 and 4, the resonator frame 200 is formed in the lower cover panel 300 so as to penetrate the interior and exterior of the cavity C, and the lower end portion thereof is tightly fitted into a plurality of mating through-holes 310h that are spaced apart in the longitudinal direction and arranged in two or more rows in the width direction, and then the periphery of the mating through-holes 310h may be fixed inside the cavity C by soldering. Here, the lower end portion of the resonator frame 200 refers to a portion of both ends in the thickness direction that is adjacent to the lower cover panel 300.

[0039] In addition, as described above, the filter body 105 is formed by using a deep drawing press method to form a thin metal plate having a thickness of 3.0t or less, made of copper as the first material, with the one side thickness forming panel 120, the other side thickness forming panel 130, the one side shielding panel 180A, the other side shielding panel 180B, and the body upper forming panel 150 being integrally formed, and the mounting frame panel 110 can also be formed integrally by a single press method.

[0040] The lower cover panel 300 is made of the same first material as the filter body 105, that is, copper, and can be manufactured by a press method (sheet metal) rather than a deep drawing press method.

[0041] On the other hand, the resonator frame 200 is made of a plate material having a predetermined thickness or more (at least thicker than the thickness of the filter body 105, 3.0t) and made of SUS material as a second material, which is different from the filter body 105 and the lower cover panel 300, which are made of copper as a first material, and the above-mentioned multiple resonator bars 220 can be integrally formed by a press process (sheet metal).

[0042] Here, the lower cover panel 300 to which the resonator frame 200 is coupled is made of a first material, which is copper, and the resonator frame 200 is made of a second material, which is stainless steel, which is different from the first material. Therefore, if the resonator frame 200 is directly erected on the inner surface of the lower cover panel 300 and then coupled by welding along the contact edge, not only is the coupling strength very weak, but the welding method also has the problem of increasing insertion loss inside the cavity C.

[0043] Therefore, in the filter 100 for a communication device according to one embodiment of the present invention, in order to minimize the insertion loss and achieve stable internal coupling, the periphery of the lower end of the resonator frame 200 that protrudes to the outside through the plurality of mating through-holes 310h is soldered as described above.

[0044] 3 and 4, the resonator frame 200 includes a plurality of resonator bars 220 arranged in two rows in the width direction of the cavity C, each arranged longitudinally and spaced a predetermined distance apart; a resonator connecting bar 210 connecting the lower ends of the resonator bars 220 in each row and having resonator coupling ends 215 inserted into the corresponding through-holes 310h, the lower ends of which are exposed to the outside of the cavity C; and a resonator characteristic end 230 formed at the tip (upper end) of each resonator bar 220.

[0045] Here, the plurality of resonant bars 220 are arranged in the cavity C at intervals in the longitudinal direction, and adjacent resonant bars 220 can be arranged in a zigzag pattern at intervals so as to be adjacently coupled between the first and second rows in the width direction.

[0046] That is, the resonator frame 200 is provided in a number corresponding to the number of rows of the plurality of fitting through holes 310h formed in the lower cover panel 300, and the plurality of resonator bars 220 can be arranged at a predetermined distance apart in the longitudinal direction of the filter body 105 so as not to overlap each other in the width direction of the filter body 105.

[0047] Meanwhile, the resonator frame 200 may be provided with notch forming portions 241 and 242, in which notch bars are formed on both sides of one of the plurality of resonator bars 220 arranged sequentially in the longitudinal direction of the filter body 105, and extend a predetermined distance from each other perpendicular to the mutually positioned direction from the side portions of the resonator bars 220.

[0048] Here, the notch forming portions 241 and 242 include an L-notch portion 241 formed such that a pair of resonator bars 220 spaced apart by at least one adjacent resonator bar 220 are interconnected, and a C-notch portion formed such that a pair of resonator bars 220 spaced apart by at least one adjacent resonator bar 220 are not interconnected. The C-notch portion 242 may be formed at a position (e.g., a resonant characteristic end 230) of the plurality of resonator bars 220 that is relatively closer to the top surface of the filter body 105 than the L-notch portion 241.

[0049] Meanwhile, as already explained, the filter body 105 and the lower cover panel 300 may be made of the same material, the first material may be a copper material, and the second material forming each resonator bar 220 of the resonator frame 200 may be a conductive material other than the copper material (preferably, a SUS material).

[0050] In addition, the upper surface of the filter body 105 may be provided with a plurality of tuning embossing surfaces 156, each provided at a position directly above the plurality of resonating bars 220, for adjusting the fine frequency by adjusting the distance from the plurality of resonating bars 220 using an embossing method.

[0051] The multiple tuning embossing surfaces 156 are formed to a thickness smaller than the thickness of the upper surface of the filter body 105. For example, if the multiple tuning embossing surfaces 156 are formed into a rectangular shape that is long in the longitudinal direction, both longitudinal ends may be integrally connected to the upper body forming panel 150 that corresponds to the upper surface of the filter body 105, and both widthwise ends may be formed by cutting into the upper body forming panel 150 that corresponds to the upper surface of the filter body 105.

[0052] In addition, the upper surface of the filter body 105 may be provided with a plurality of coupling adjustment surfaces 157, each provided at a position corresponding to a gap between adjacent resonant bars 220 among the plurality of resonant bars 220, and which change the coupling value between the adjacent resonant bars 220 by deforming and protruding into the cavity C using a stamping method.

[0053] Here, the multiple coupling adjustment surfaces 157 are formed to a thickness smaller than the thickness of the upper surface of the filter body 105. For example, when the multiple coupling adjustment surfaces 157 are formed in a rectangular shape that is elongated in the width direction, one of the longitudinal ends and both widthwise ends based on this shape may be formed by cutting into the upper body forming panel 150 that corresponds to the upper surface of the filter body 105. Therefore, the multiple coupling adjustment surfaces 157 are supported in a cantilevered manner at the end on the opposite side based on the portion of the filter body 105 that is not cut into the upper body forming panel 150, and are deformed between the multiple resonant bars 220 by an external force transmitted from outside.

[0054] The filter 100 for a communication device according to one embodiment of the present invention configured as described above has a filter body 105 formed by a deep drawing press method, a lower cover panel 300 that covers the open bottom of the filter body 105, and a resonator frame 200 made of a different material that is stably coupled to the filter body 105 by an interference fit and soldering method, thereby minimizing insertion loss and providing the advantage of significantly improving communication reliability of the communication device.

[0055] 6 is a vertical cross-sectional view taken along line AA in FIG. 1, and a partially enlarged view showing the connection between the mounting panel of the filter body and the lower cover panel, and the connection between the lower cover panel and the resonator frame. FIG. 7 is a horizontal cross-sectional view taken along line BB in FIG. 1. FIG. 8 is a vertical cross-sectional view taken along line AA in FIG. 1, and a partially enlarged view showing the coupling adjustment bar in the configuration. FIG. 9 is a vertical cross-sectional view taken along line AA in FIG. 1, and a partially enlarged view showing the tuning engraved surface in the configuration. FIG. 10 is a plan view (a) of FIG. 1, a plan view (b) of the resonator frame, and an internal perspective plan view (c).

[0056] The effects in terms of productivity and frequency tuning design of the filter 100 for a communication device according to one embodiment of the present invention described with reference to FIGS. 1 to 5 will be briefly described below with reference to FIGS. 6 to 10.

[0057] First, as shown in FIG. 6, in a filter 100 for a communication device according to one embodiment of the present invention, the filter body 105 is formed by a deep drawing press method, which is one of the press methods, simultaneously forming the upper body forming panel 150, the one-side thickness forming panel 120 and the other-side thickness forming panel 130, the one-side shielding panel 180A and the other-side shielding panel 180B, and the mounting frame panel 110. This method breaks away from conventional molding methods using molding materials and can significantly improve product productivity.

[0058] The application of the deep drawing press method as a manufacturing method for the filter body 105 has the advantage that the configuration within the cavity C can be simplified by eliminating the need for a separate connection between the lower cover panel 300 and the resonator frame 200, which will be described later, and that the insertion loss that would otherwise be caused by the installation of a separate structure can be prevented in advance.

[0059] As shown in FIG. 6, the lower cover panel 300 that shields the open bottom portion of the cavity C of the filter body 105 is formed by a press process to have an outer shape corresponding to the outer edge of the mounting frame panel 110 of the filter body 105, and at the same time, multiple mating through-holes 310h for soldering the resonator frame 200 can be formed in a single press process.

[0060] In this way, the filter body 105 and the lower cover panel 300 formed by the deep drawing press method and the pressing method can be bonded to each other by surface-to-surface bonding between the lower surface of the mounting frame panel 110 and the upper surface of the edge of the lower cover panel 300, and after a solder material is interposed between them in advance, they can be soldered together using the SMT method, as shown in Figure 6, which has the advantage of significantly reducing the insertion loss within the cavity C.

[0061] In addition, when the resonator frame 200 is installed in the cavity C, as shown in FIG. 6, the resonator coupling ends 215 of the resonator frame 200 are inserted into the lower cover panel 300 so that their lower ends are exposed to the outside through the plurality of through-holes 310h formed therein, and then the resonator frame 200 can be fixed by soldering on the outside. This completely eliminates the need for a conventional welding process inside the cavity C, thereby completely eliminating the associated insertion loss.

[0062] Next, the effects of the communication device filter 100 according to the embodiment of the present invention in terms of frequency tuning design will be described.

[0063] As shown in FIG. 7, seven resonant bars 220 (201 to 207) of the resonator frame 200 are arranged at intervals from one side to the other in the longitudinal direction within the cavity C, and are arranged so that a signal input through the first resonant bar 201 on one side is filtered sequentially through the second to sixth resonant bars 202 to 206, and then output through the seventh resonant bar 207 on the other side.

[0064] Here, typically, each signal path between adjacent resonant bars from the first resonant bar 201 to the seventh resonant bar 207 (for example, between the first resonant bar 201 and the second resonant bar 202, between the second resonant bar 202 and the third resonant bar 203, between the third resonant bar 203 and the fourth resonant bar 204, between the fourth resonant bar 204 and the fifth resonant bar 205, between the fifth resonant bar 205 and the sixth resonant bar 206, and between the sixth resonant bar 206 and the seventh resonant bar 207) is defined as represented by the drawing symbols "1 to 6 surrounded by circles," and in fact, adjacent resonant bars 220 among each resonant bar 220 are filtered sequentially according to the above-mentioned signal paths "1 to 6 surrounded by circles."

[0065] In this case, a signal path (7 surrounded by a circle) for realizing a C-notch at the left end (low frequency region) of the passband may be further formed by capacitive coupling through the C-notch portions 242 formed on the first resonant bar 201 and the second resonant bar 202, and a signal path (8 surrounded by a circle) for realizing an L-notch at the right end (high frequency region) of the passband by inductive coupling through the L-notch portion 241 formed to connect the fourth resonant bar 204 and the sixth resonant bar 206.

[0066] Meanwhile, referring to Figures 8 and 9, the upper body forming panel 150 corresponding to the positions of the resonance characteristic ends 230 of each of the resonator bars 201 to 207 of the resonator frame 200 may have the above-mentioned multiple tuning engraved surfaces 156 formed thereon, and the upper body forming panel 150 corresponding to the spaces between each of the resonator bars 201 may have the above-mentioned multiple coupling adjustment surfaces 157 formed thereon.

[0067] As shown in FIG. 10, the filter 100 for a communication device according to one embodiment of the present invention, configured as described above, can perform adjacent coupling and cross coupling in the signal path (1 to 6 circled) in the process in which a signal is input through the first resonant bar 201 adjacent to one side of the cavity C and output through the seventh resonant bar 207, and can also perform coupling to form an L-notch and a C-notch in the additional signal path (7 and 8 circled).

[0068]

[0023] A filter for a communication device according to one embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the above embodiment and that various modifications and variations within the scope of equivalents may be made by those skilled in the art. Therefore, the true scope of the present invention is defined by the following claims. [Industrial Applicability]

[0069] The present invention provides a filter for a communication device in which a filter body forming a cavity is manufactured by a deep drawing press process, and then a resonator frame made of a different material is tightly fitted and soldered to a lower cover panel made of the same material that shields one open side of the cavity, thereby minimizing insertion loss within the cavity. [Explanation of symbols]

[0070] 100: Filter for communication equipment, 105: Filter body 110: Mounting frame panel, 120: One-side thickness forming panel 130: Other side thickness forming panel, 150: Body upper forming panel 180A: One side shielding panel, 180B: Other side shielding panel 200: Resonator frame, 210: Resonator connecting bar 215: Resonator coupling end, 220: Resonator bar 230: Resonance characteristic end, 300: Lower cover panel 310h: Mating through hole

Claims

1. a cavity that is a dielectric-filled space, the cavity comprising: a filter body having an open bottom; a lower cover panel made of a first material coupled to the open bottom of the filter body to cover the open bottom; a resonator frame made of a second material, coupled to the lower cover panel and including a plurality of resonator bars extending a predetermined length toward an upper surface of the filter body; the resonator frame is fastened at its lower end to a plurality of mating through-holes formed in the lower cover panel to penetrate the interior and exterior of the cavity, the mating through-holes being spaced apart in the longitudinal direction and arranged in two or more rows in the width direction, and the resonator frame is then fixed inside the cavity by soldering around the plurality of mating through-holes.

2. the resonator frames are provided in a number corresponding to the number of rows of the plurality of fitting through holes formed in the lower cover panel; 2. The filter for a communication device according to claim 1, wherein the plurality of resonating bars are arranged at predetermined intervals in the longitudinal direction of the filter body so as not to overlap each other in the width direction of the filter body.

3. The resonator frame includes:

3. The filter for a communication device according to claim 2, further comprising: a notch forming portion in which notch bars are formed on both sides of any one of the plurality of resonator bars arranged sequentially in the longitudinal direction of the filter body, the notch bars extending a predetermined distance from each other in a direction perpendicular to the mutual positioning direction from the side portions of the resonator bars on both sides of the one of the plurality of resonator bars arranged sequentially in the longitudinal direction of the filter body.

4. The notch forming portion is a C-notch portion where the notch bars are not interconnected; the notch bars include interconnected L-notch sections; 4. The filter for a communication device according to claim 3, wherein the C-notch portion is formed at a position of the notch bar that is relatively closer to the top surface of the filter body among the plurality of resonating bars than the L-notch portion.

5. the filter body and the lower cover panel are made of the same material; 2. The filter for a communication device according to claim 1, wherein the first material is a copper material, and the second material is a conductive material other than the copper material.

6. 2. The filter for a communication device according to claim 1, wherein the upper surface of the filter body is provided with a plurality of tuning engraved surfaces, each of which is provided at a position corresponding to a position directly above the plurality of resonant bars, and which adjusts the fine frequency by adjusting the distance from the plurality of resonant bars by an engraved method.

7. 7. The filter for a communication device according to claim 6, wherein the plurality of tuning engraved surfaces are formed to a thickness smaller than a thickness of the upper surface of the filter body, both longitudinal ends are integrally connected to the upper surface of the filter body, and both widthwise ends are formed by incisions into the upper surface of the filter body.

8. 6. The filter for a communication device according to claim 5, wherein the upper surface of the filter body is provided with a plurality of coupling adjustment surfaces, each of which is provided at a position corresponding to a gap between adjacent ones of the plurality of resonant bars, and which are stamped to change a coupling value between the adjacent resonant bars by deforming and protruding into the cavity.

9. The plurality of coupling adjustment surfaces include:

9. The filter for a communication device according to claim 8, wherein the filter is formed to a thickness smaller than a thickness of an upper surface of the filter body, and either one of both longitudinal ends and both widthwise ends is formed by incision with respect to the upper surface of the filter body.

10. 2. The filter for a communication device according to claim 1, wherein the filter body is manufactured by a deep drawing press method so as to form a joint portion that is in surface contact with an edge of the lower cover panel.

11. The resonator frame includes a plurality of resonator bars arranged in two rows in the width direction of the cavity, and spaced apart by a predetermined distance from each other in the longitudinal direction; a resonator connection bar having a resonator coupling end formed thereon, the resonator connection bar being inserted into each of the plurality of fitting through-holes of the lower cover panel; a resonance characteristic end formed at a tip of each of the plurality of resonance bars; 2. The filter for a communication device according to claim 1, wherein a lower end of the resonator coupling end, which passes through a plurality of fitting through-holes of the lower cover panel from the outside and is exposed to the outside, is soldered.

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