Filters for communication equipment

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 (FILTER FOR COMMUNICATION DEVICE), and more particularly, to a filter body forming a cavity manufactured by a deep drawing press process, and then to a lower cover panel made of the same material that shields one side of the cavity where the opening of the cavity is formed. After a resonator frame made of a different material is press-fitted and coupled, it is soldered, and the present invention relates to a filter for a communication device that can minimize insertion loss in the cavity.

Background Art

[0002] A radio frequency device (including all "communication devices") such as a radio frequency filter is usually composed of a connection structure of a plurality of resonators. Such a resonator is a circuit element that resonates at a specific frequency by a combination of an inductor (L) and a capacitor (C) in an equivalent electronic circuit. Each resonator has a structure in which a dielectric resonance element (DR: Dielectric Resonance element) or a metal resonance element is provided inside a cavity such as a metallic cylinder or a 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 a processing frequency band to exist in the cavity. Usually, a plurality of cavities are used to form a plurality of resonance ends, and a multi-stage structure in which the plurality of resonance ends are sequentially connected is provided.

[0003] Examples related to a radio frequency filter having a plurality of cavity structures include those disclosed in Korean Patent Publication No. 10-2004-0100084 (Title: "Radio Frequency Filter", Publication Date: December 2, 2004) previously filed by the applicant of the present application.

[0004] However, conventional radio frequency filters have a very limiting problem in reducing the size of the finished filter in the thickness direction, as each resonator extends in the thickness direction within the cavity, and the frequency is tuned by adjusting the distance between the resonator and a part of the filter tuning cover that covers the cavity by deforming it using a stamping method to achieve the desired bandpass characteristics.

[0005] Furthermore, conventional radio frequency filters require the addition of conductive material components to achieve inductive or capacitive coupling in order to enhance the skirt characteristics between adjacent or spaced-out resonators within multiple cavities, which has been pointed out as a problem that significantly increases the weight of the finished filter.

[0006] On the other hand, in recent years, research has been progressing in antenna devices to which Massive MIMO (Multiple Input Multiple Output) technology is applied, with the aim of minimizing the thickness of internal components such as filters in order to slim down the overall product. The most commonly used type of filter for this purpose is dielectric ceramic filter.

[0007] However, dielectric ceramic filters have the drawback of reduced productivity because, due to the characteristics of their material, the manufacturing method for the filter body is limited to the molding method, while at the same time, the variability of the subsequent frequency tuning design is reduced because the cavity shape must be manufactured in advance to essentially match the design value of the final frequency.

[0008] On the other hand, when using copper panels as the filter material, there is the advantage that various manufacturing methods such as press die methods can be applied, preventing the aforementioned decrease in productivity. However, if the material of the filter body and the resonator, which is a resonant element located inside the cavity, are different, welding is used in the joining process, which leads to the problem of high insertion loss. [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention was made to solve the above technical problems, and aims to provide a filter for communication equipment in which the filter body forming the cavity is manufactured by a deep drawing press process, a resonator frame of a different material is crimped and bonded to a lower cover panel of the same material that shields one side of the opening of the cavity, and then soldered together, thereby minimizing insertion loss in the cavity. [Means for solving the problem]

[0010] A filter for communication equipment according to one embodiment of the present invention includes a cavity which is a dielectric-filled space, the cavity including a filter body with an open bottom, a lower cover panel of a first material coupled to the open bottom of the filter body, and a resonator frame of a second material which is coupled to the lower cover panel and includes a plurality of resonant bars that extend a predetermined length toward the upper surface of the filter body, the lower end of the resonator frame is crimped into a plurality of mating through holes formed in the lower cover panel that penetrate the inside and outside of the cavity and are provided in two or more rows in the width direction spaced apart in the longitudinal direction, and then the periphery of the plurality of mating through holes is fixed inside the cavity by soldering.

[0011] Here, the resonator frame is provided in correspondence with the number of rows of fitting through holes formed in the lower cover panel, and the plurality of resonant bars can be arranged at a predetermined distance apart in the longitudinal direction of the filter body so as not to overlap each other in the width direction of the filter body.

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

[0013] Furthermore, the notch forming portion includes a C-notch portion where the notch bars are not interconnected and an L-notch portion where the notch bars are interconnected, and the notch bars in the C-notch portion may be formed at a position that is relatively closer to the upper surface of the filter body among the plurality of resonant bars than the L-notch portion.

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

[0015] Furthermore, the upper surface of the filter body may be provided with a plurality of tuning marking surfaces, each positioned directly above the plurality of resonant bars, which adjust fine frequencies by adjusting the distance between them and the plurality of resonant bars using a marking method.

[0016] Furthermore, the plurality of tuning marking surfaces may be formed with a thickness less than the thickness of the upper surface of the filter body, with both ends in the longitudinal direction integrally connected to the upper surface of the filter body, and both ends in the width direction formed by cuttings relative to the upper surface of the filter body.

[0017] Furthermore, the upper surface of the filter body may be provided with a plurality of coupling adjustment surfaces, each positioned between adjacent resonant bars among the plurality of resonant bars, which change the coupling value between adjacent resonant bars by deforming in shape and protruding inward into the cavity through a stamping method.

[0018] Furthermore, the plurality of coupling adjustment surfaces may be formed with a thickness less than the thickness of the upper surface of the filter body, and one of either the longitudinal end or the widthwise end may be formed by cutting into the upper surface of the filter body.

[0019] Furthermore, the filter body can be manufactured by a deep drawing press method such that a joint is formed that makes surface contact with the edge of the lower cover panel.

[0020] Further, the resonator frame includes a plurality of resonance bars arranged longitudinally in two columns in the width direction of the cavity at a predetermined distance apart from each other, a resonator connecting bar formed with resonator coupling ends respectively inserted into a plurality of fitting through holes of the lower cover panel, and resonance characteristic ends formed at the tips of the plurality of resonance bars. The lower ends of the resonator coupling ends exposed to the outside through the plurality of fitting through holes of the lower cover panel from the outside of the lower cover panel can be soldered.

Advantages of the Invention

[0021] The 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 resonator frame, which is a structure in a cavity, as a different material from a filter body, with a minimum insertion loss amount.

Brief Description of the Drawings

[0022] [Figure 1] It is a bottom perspective view of a filter for a communication device according to an embodiment of the present invention. [Figure 2] It is an upper perspective view of FIG. 1. [Figure 3] It is an exploded perspective view of FIG. 1. [Figure 4] It is an exploded perspective view of FIG. 2. [Figure 5] It is a cut-away perspective view in which a part is cut open so that the cavity appears in the configuration of FIG. 1. [Figure 6] It is a vertical cross-sectional view taken along line A-A of FIG. 1, and a partial enlarged view showing the state of connection between the mounting panel of the filter body and the lower cover panel and the state of connection between the lower cover panel and the resonator frame in the configuration. [Figure 7] It is a horizontal cross-sectional view taken along line B-B of FIG. 1. [Figure 8] It is a vertical cross-sectional view taken along line A-A of FIG. 1, and a partial enlarged view showing the coupling adjustment bar in the configuration. [Figure 9]A vertical sectional view taken along the line A-A of FIG. 1 and a partially enlarged view showing the tuning engraving surface of its configuration. [Figure 10] A plan view (a) of FIG. 1, a plan view (b) of the resonator frame, and an internal perspective plan view (c).

Mode for Carrying Out the Invention

[0023] Hereinafter, a filter for a communication device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0024] When attaching reference numerals to the components in each drawing, it should be noted that the same components have, as far as possible, the same reference numerals even if they are shown on other drawings. Further, when explaining the embodiments of the present invention, if a specific explanation of such a known configuration or function is determined to hinder the understanding of the embodiments of the present invention, the detailed explanation thereof will be omitted.

[0025] When explaining the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. can be used. Such terms are merely for distinguishing the components from other components, and the essence, order, or procedure of the components is not limited by such terms. Further, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those having ordinary knowledge in the technical field to which the present invention belongs. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or overly formal sense unless clearly defined in the present application.

[0026] FIG. 1 is a bottom perspective view of a filter for a communication device according to an 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 cut-away perspective view in which a part is cut open so that the cavity appears in the configuration of FIG. 1.

[0027] A filter for communication equipment according to one embodiment of the present invention, as shown in Figures 1 to 5, includes a cavity C which is a dielectric-filled space, a filter body 105 with an open bottom within the cavity C, a lower cover panel 300 coupled to the filter body 105 so as to shield the bottom of the open cavity C, and a resonator frame 200 coupled to the lower cover panel 300 and including a plurality of resonant 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 surface of the cavity C, may be formed from a metal panel member of the same material, the first material. Furthermore, the first material used as the metal panel member of the filter body 105 and the lower cover panel 300 may be copper, which has excellent conductivity.

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

[0030] In order to better understand the communication equipment filter 100 according to one embodiment of the present invention, terms related to "direction" and "position" described in the detailed description of the present invention can be defined as follows.

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

[0032] On the other hand, the lower cover panel 300 is formed to a size corresponding to the edge of the mounting frame panel 110 in the configuration 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 by surface bonding.

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

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

[0035] Here, assuming that the filter body 105 and the lower cover panel 300 described above are manufactured by a press molding process using sheet metal, the cavity C may be formed to be elongated in the left-right longitudinal direction and to have a rectangular parallelepiped shape in which the front-to-back width is smaller than the height.

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

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

[0038] On the other hand, as shown in Figures 3 and 4, the resonator frame 200 is formed in the lower cover panel 300, penetrating both the inside and outside of the cavity C. Its lower end is crimped into a plurality of fitting through-holes 310h, which are spaced apart in the longitudinal direction and arranged in two or more rows in the width direction. After this, the area around the plurality of fitting through-holes 310h can be fixed inside the cavity C by soldering. Here, the lower end of the resonator frame 200 refers to the 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 a deep drawing press method from a thin metal sheet material with 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 upper body forming panel 150 being integrally formed, and the mounting frame panel 110 can also be integrally formed by a single press method.

[0040] Furthermore, the lower cover panel 300 is made of copper as the same primary material as the filter body 105, and although it is not manufactured by deep drawing press molding, it can be manufactured by press molding (sheet metal).

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

[0042] Here, the lower cover panel 300 to which the resonator frame 200 is attached is made of copper, which is the first material, and the resonator frame 200 is made of a different type of SUS material, which is the second material. If the resonator frame 200 is erected directly on the inner surface of the lower cover panel 300 and then joined by welding along its contact end, the joining force will be very weak, and the welding method has the problem of increasing the insertion loss inside the cavity C.

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

[0044] On the other hand, the resonator frame 200, as shown in Figures 3 and 4, may include a plurality of resonant bars 220 arranged longitudinally in two rows in the width direction of the cavity C at predetermined distances apart, a resonator connecting bar 210 that connects the lower ends of the resonant bars 220 in each row and has resonator coupling ends 215 formed therein, which are inserted into a plurality of fitting through holes 310h and whose lower ends are exposed to the outside of the cavity C, and a resonant characteristic end 230 formed at the tip (upper end) of each resonant bar 220.

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

[0046] In other words, the resonator frame 200 is provided in correspondence with the number of rows of fitting through holes 310h formed in the lower cover panel 300, and the multiple resonant 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] On the other hand, the resonator frame 200 may be provided with notch forming portions 241 and 242, which are formed on the sides of any one of the multiple resonant bars 220 arranged sequentially in the longitudinal direction of the filter body 105, with notch bars extending a predetermined distance from each other perpendicular to the direction in which they are located.

[0048] Here, the notch forming sections 241 and 242 include an L-notch section 241 formed such that a pair of resonant bars 220 separated by skipping at least one adjacent resonant bar 220 are interconnected, and a C-notch section formed such that a pair of resonant bars 220 separated by skipping at least one adjacent resonant bar 220 are not interconnected. In the C-notch section 242, the notch bar may be formed at a position (for example, the resonant characteristic end 230) that is relatively closer to the upper surface of the filter body 105 than the L-notch section 241 among the plurality of resonant bars 220.

[0049] On the other hand, as has already been explained, the filter body 105 and the lower cover panel 300 are made of the same material, the first material being copper, and the second material forming each resonant bar 220 of the resonator frame 200 being a conductive material other than copper (preferably SUS material).

[0050] Furthermore, the upper surface of the filter body 105 may be provided with multiple tuning marking surfaces 156, each positioned directly above the multiple resonant bars 220, which can be used to adjust fine frequencies by adjusting the distance between them and the multiple resonant bars 220 using a marking method.

[0051] The multiple tuning marking surfaces 156 are formed to a thickness less than the thickness of the upper surface of the filter body 105. For example, if the multiple tuning marking surfaces 156 are formed to be long in the longitudinal direction and rectangular, both ends in the longitudinal direction may be integrally connected to the upper body forming panel 150 corresponding to the upper surface of the filter body 105, while both ends in the width direction may be cut open from the upper body forming panel 150 corresponding to the upper surface of the filter body 105.

[0052] Furthermore, the upper surface of the filter body 105 may be provided with a plurality of coupling adjustment surfaces 157, each positioned between adjacent resonant bars 220, which change the coupling value between adjacent resonant bars 220 by deforming in shape and protruding inward into the cavity C through a stamping method.

[0053] Here, the multiple coupling adjustment surfaces 157 are formed with a thickness less than the thickness of the upper surface of the filter body 105. For example, if the multiple coupling adjustment surfaces 157 are formed in a long rectangle in the width direction, one of the longitudinal ends and both width ends, based on that shape, may be cut into the upper body forming panel 150, which 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 opposite end, based on the portion of the filter body 105 that is not cut into the upper body forming panel 150, and deform in shape between the multiple resonant bars 220 due to external forces transmitted from the outside.

[0054] A filter 100 for communication equipment according to one embodiment of the present invention, having the above configuration, provides the advantage of greatly improving the reliability of communication in communication equipment by forming a filter body 105 by a deep drawing press method, providing a lower cover panel 300 that shields the open bottom of the filter body 105, and connecting a resonator frame 200 of different materials in a way that is stable and minimizes insertion loss by a crimp-fit ​​coupling method and solder coupling.

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

[0056] The effects of the communication equipment filter 100 according to one embodiment of the present invention, as described with reference to Figures 1 to 5, in terms of productivity and frequency tuning design, can be briefly explained with reference to Figures 6 to 10 as follows.

[0057] First, in one embodiment of the present invention, as shown in Figure 6, the filter body 105 for communication equipment is formed by deep drawing press molding, a type of press molding, which simultaneously forms 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 eliminates the need for conventional molding methods using molding materials, thereby significantly improving product productivity.

[0058] The application of the deep drawing press method as a manufacturing method for the filter body 105 offers the advantage of preemptively blocking insertion losses caused by the installation of other structures, by simplifying the configuration within the cavity C except for the additional coupling of the lower cover panel 300 and the resonator frame 200, which will be described later.

[0059] Furthermore, as shown in Figure 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 molding process to have an outer shape corresponding to the outer edge of the mounting frame panel 110 of the filter body 105, while simultaneously forming multiple mating through holes 310h for soldering the resonator frame 200 in a single press molding process.

[0060] Thus, the filter body 105 and the lower cover panel 300, which are formed and manufactured by the deep drawing press method and the press method, can be joined to each other by joining the lower surface of the mounting frame panel 110 and the upper surface of the edge of the lower cover panel 300, as shown in Figure 6, and then soldered together by the SMT method after interposing solder material between them in advance. This has the advantage of greatly reducing insertion loss within the cavity C.

[0061] In addition, when installing the resonator frame 200 inside the cavity C, as shown in Figure 6, each of the resonator coupling ends 215 of the resonator frame 200 is fitted so that its lower end is exposed to the outside through a plurality of fitting through holes 310h formed in the lower cover panel 300, and then fixed externally by soldering. This completely eliminates the conventional welding process inside the cavity C, which has the advantage of completely blocking insertion losses.

[0062] Next, we will explain the effects of a frequency tuning design of a filter 100 for communication equipment according to one embodiment of the present invention.

[0063] As shown in Figure 7, the multiple resonant bars 220 of the resonator frame 200 are arranged in the cavity C, with seven bars (201-207) spaced apart from one side to the other in the longitudinal direction. The signal input via the first resonant bar 201 on one side is filtered sequentially through the second to sixth resonant bars 202-206, and then output via the seventh resonant bar 207 on the other side.

[0064] Here, typically, the signal paths between mutually 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) are defined as shown by the diagram reference numerals "1 to 6 enclosed in circles," and in practice, adjacent resonant bars 220 are filtered sequentially according to the signal paths "1 to 6 enclosed in circles" described above.

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

[0066] On the other hand, referring to Figures 8 and 9, the upper body forming panel 150 corresponding to the positions of the resonant characteristic ends 230 of each resonant bar 201 to 207 of the resonator frame 200 may have the above-described tuning stamped surfaces 156 formed thereon, and the upper body forming panel 150 corresponding to the spaces between each resonant bar 201 may have the above-described coupling adjustment surfaces 157 formed thereon.

[0067] As shown in Figure 10, a filter 100 for communication equipment according to one embodiment of the present invention, having the above configuration, can perform adjacent coupling and cross-coupling in the signal path (circled 1-6) during 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 perform coupling for forming an L-notch and a C-notch in an additional signal path (circled 7-8).

[0068] A filter for communication equipment according to one embodiment of the present invention has been described in detail above with reference to the attached drawings. However, the embodiments of the present invention are not necessarily limited to the embodiment described above, and it goes without saying that various modifications and equivalent implementations are possible by persons with ordinary skill in the art to which the present invention pertains. Therefore, the true scope of the rights of the present invention is determined by the claims described later. [Industrial applicability]

[0069] The present invention provides a filter for communication equipment in which the filter body forming the cavity is manufactured by a deep drawing press process, and then a resonator frame made of a different material is crimped 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-sided thickness forming panel 130: Other side thickness forming panel, 150: Body upper forming panel 180A: One-sided shielding panel, 180B: Other-sided shielding panel 200: Resonator frame, 210: Resonator connecting bar 215: Resonator coupling end, 220: Resonant bar 230: Resonance characteristic edge, 300: Lower cover panel 310h: Mating through hole

Claims

1. It includes a cavity which is a dielectric-filled space, and the cavity has an open bottom and a filter body, A lower cover panel made of a first material is coupled to the open bottom of the filter body so as to shield it, The resonator frame includes a plurality of resonant bars of a second material, which are coupled to the lower cover panel and extend a predetermined length toward the upper surface of the filter body, The resonator frame is formed in the lower cover panel, penetrating both the inside and outside of the cavity. Its lower end is crimped into a plurality of mating through-holes, which are spaced apart in the longitudinal direction and arranged in two or more rows in the width direction. The area around the plurality of mating through-holes is then fixed inside the cavity by soldering. The resonator frame is provided in a manner corresponding to the number of rows of fitting through holes formed in the lower cover panel, A filter for communication equipment, wherein the plurality of resonant bars are arranged at predetermined distances apart in the longitudinal direction of the filter body so as not to overlap each other in the width direction of the filter body.

2. The aforementioned resonator frame includes: A filter for communication equipment according to claim 1, comprising: a notch forming portion in which notch bars are formed on both sides of the resonant bars that sandwich any one of the plurality of resonant bars arranged sequentially in the longitudinal direction of the filter body, and which extend a predetermined distance from each other perpendicular to the direction in which they are located.

3. The notch forming portion is, The C-notch portion, in which the aforementioned notch bars are not interconnected, The notch bars are interconnected and include an L-notch section, The filter for communication equipment according to claim 2, wherein the C-notch portion is formed in a position where the notch bar is closer to the upper surface of the filter body among the plurality of resonant bars than the L-notch portion.

4. The filter body and the lower cover panel are made of the same material. The filter for communication equipment according to claim 1, wherein the first material is copper, and the second material is a conductive material excluding copper.

5. The filter for communication equipment according to claim 1, wherein the upper surface of the filter body is provided with a plurality of tuning marking surfaces, each positioned directly above the plurality of resonant bars, and which adjust fine frequencies by adjusting the distance from the plurality of resonant bars using a marking method.

6. The filter for communication equipment according to claim 5, wherein the plurality of tuning marking surfaces are formed to a thickness less than the thickness of the upper surface of the filter body, both ends in the longitudinal direction are integrally connected to the upper surface of the filter body, and both ends in the width direction are formed by cutting into the upper surface of the filter body.

7. The filter for communication equipment according to claim 4, wherein the upper surface of the filter body is provided with a plurality of coupling adjustment surfaces, each positioned between adjacent resonant bars among the plurality of resonant bars, which change the coupling value between adjacent resonant bars by deforming in shape and protruding inward into the cavity by a stamping method.

8. The plurality of coupling adjustment surfaces are The filter for communication equipment according to claim 7, wherein the filter is formed to a thickness less than the thickness of the upper surface of the filter body, and one of either the longitudinal end or the width end is cut out from the upper surface of the filter body.

9. The filter for communication equipment according to claim 1, wherein the filter body is manufactured by a deep drawing press method such that a joint is formed that makes surface contact with the edge of the lower cover panel.

10. The resonator frame comprises a plurality of resonant bars arranged in two rows in the width direction of the cavity, each arranged longitudinally and spaced apart by a predetermined distance, A resonator coupling bar having resonator coupling ends formed therein, which are inserted into each of the multiple fitting through holes of the lower cover panel, The plurality of resonant bars include resonant characteristic ends formed at their tips, The filter for communication equipment according to claim 1, wherein the lower end of the resonator coupling end, which is exposed to the outside by passing through a plurality of fitting through holes in the lower cover panel, is soldered from the outside of the lower cover panel.

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