Filter for communication equipment and manufacturing method thereof

Abstract

To provide a filter for communication equipment that is easy to manufacture and allows the entire product to be made slimmer and lighter. The filter for a communication device includes a single base plate made of a conductive plate material having a predetermined thickness or less, which forms an inner surface of a cavity for frequency filtering. The cavity is formed by folding at least a portion of the base plate.

Description

[Technical Field]

[0001] The present invention relates to a filter for communication devices and a manufacturing method thereof, and more particularly to a filter for communication devices and a manufacturing method thereof, which minimizes insertion loss due to a coupling process of an internal structure of a cavity (e.g., a resonator panel including a plurality of resonators) by integrally manufacturing each component of a single base plate in a foldable manner, and which is easy to manufacture and enables a slim antenna device product to be manufactured in the thickness direction. [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 are bonded directly to one side of the main board (or PA board) stacked inside the antenna housing, which means that they are limited to being used on both sides of the PCB (printed circuit board). Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made to solve the above-mentioned technical problems, and aims to provide a filter for a communication device, and a manufacturing method thereof, which can reduce the insertion loss caused by the coupling of two physical structures by minimizing the conventional bonding process for forming a cavity and providing a structure such as a resonator in the cavity.

[0009] Another object of the present invention is to provide a filter for a communication device and a manufacturing method thereof that can improve product reliability by reinforcing the coupling rigidity of a filter provided by a folding method using a thin base plate with relatively low rigidity.

[0010] The technical problems of the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0011] A filter for a communication device according to one embodiment of the present invention includes a single base plate made of a conductive plate material having a predetermined thickness or less, which forms an inner surface of a cavity for frequency filtering, and the cavity is formed by folding at least a portion of the base plate.

[0012] Here, the base plate may include a body bottom forming panel that forms a bottom portion of the cavity; a lower one-side thickness forming panel and a lower other-side thickness forming panel that are folded in the same direction at one and the other widthwise ends of the body bottom forming panel to form a part of the cavity; a frequency tuning panel having the other widthwise end integrally connected to the folded other-side thickness forming panel and the one widthwise end folded to be connected to an upper end of the folded one-side thickness forming panel, the frequency tuning panel including a plurality of tuning bars that form a different single layer to be spaced a predetermined distance in the thickness direction from a single layer forming a plurality of resonators in the cavity; and an upper body forming panel having one widthwise end folded via the upper one-side thickness forming panel and the other widthwise end folded via the upper other thickness forming panel to be spaced a predetermined distance in the thickness direction from the plurality of tuning bars of the frequency tuning panel and the upper end of the lower other thickness forming panel.

[0013] The base plate may further include a resonator panel extending perpendicular to the folded lower one-side thickness forming panel and the folded lower other-side thickness forming panel and including the plurality of resonators forming a single layer within the cavity.

[0014] In addition, the resonator panel may be coupled to and installed in a plurality of resonator panel mounting slits formed to penetrate one of the lower one-side thickness forming panel and the lower other-side thickness forming panel from the inside to the outside of the cavity.

[0015] The resonator panel may include a resonator connecting bar that horizontally connects the plurality of resonators in a longitudinal direction of the cavity, a plurality of insertion ends that are provided at outer ends of the resonator connecting bar and that are inserted into the resonator panel mounting slits, and resonance characteristic ends that are extended from tips of the plurality of resonators.

[0016] Furthermore, the plurality of insertion ends may be joined by one of a brazing method and a welding method after being inserted into the plurality of resonator panel mounting slits.

[0017] In addition, at least two of the body bottom forming panel, the lower one-side thickness forming panel, the lower other-side thickness forming panel, the resonator panel, the frequency tuning panel, the upper one-side thickness forming panel, the upper other-side thickness forming panel, and the body upper forming panel may be positioned on the same horizontal plane when fully deployed.

[0018] The device may further include a one-side shielding panel integrally formed on one longitudinal end of the body bottom forming panel and folded, the one-side shielding panel having three sides connected to one longitudinal end of the lower one-side thickness forming panel in the folded state, one longitudinal end of the lower other-side thickness forming panel in the folded state, and one longitudinal end of the frequency tuning panel in the folded state; and a other-side shielding panel integrally formed on the other longitudinal end of the body bottom forming panel and folded, the one-side shielding panel having three sides connected to the other longitudinal end of the lower one-side thickness forming panel in the folded state, the other longitudinal end of the lower other-side thickness forming panel in the folded state, and the other longitudinal end of the frequency tuning panel in the folded state.

[0019] Also, the frequency tuning panel may be integrally formed with one of the lower one-side thickness forming panel and the lower other-side thickness forming panel to which the resonator panel is coupled.

[0020] The frequency tuning panel may be formed as a rectangular hollow frame penetrating vertically, and the tuning bars may extend from an inner end of one widthwise side to an inner end of the other widthwise side of the frequency tuning panel to form a single layer in the thickness direction of the cavity.

[0021] The frequency tuning panel may be formed to have an elongated length such that the tuning bars overlap the resonators and the cavities in a thickness direction, each of the resonators including the tuning bars in a single layer.

[0022] In addition, a plurality of coupling adjustment bars may be further formed on the frequency tuning panel, extending from an inner end of one widthwise side to an inner end of the other widthwise side, and forming the same single layer as the plurality of tuning bars between adjacent tuning bars among the plurality of tuning bars.

[0023] The coupling adjustment bars may extend from an inner end of one width direction of the frequency tuning panel and be connected to an inner end of the other width direction of the frequency tuning panel.

[0024] In addition, pinholes penetrating in the vertical direction are formed in the body bottom forming panel, the plurality of resonators, and the body upper forming panel, and support pins penetrating each pinhole can be installed when folding the base plate to form the cavity.

[0025] In addition, the base plate is folded to form a filter body having the cavity therein, and the filter body is disposed between a PA board and an antenna board having a plurality of radiating elements disposed on its front side, and further includes an input connector portion that inputs a predetermined electrical signal transmitted from the PA board to one side of the cavity, and an output connector portion that receives a predetermined electrical signal transmitted from the other side of the cavity and outputs it to the antenna board, and the output connector portion may include a supporting housing that transmits vertical pressure acting on the filter body when the antenna board is stacked and bonded to the front side to the PA board without transmitting it to the filter body.

[0026] In addition, the supporting housing may be formed in a hollow cylindrical shape that penetrates both the rear and front parts of the cavity in the thickness direction, with the rear end connected to the front of the PA board and the front end connected to the rear of the antenna board.

[0027] The supporting housing may be made of a rigid material having a higher strength than the filter body.

[0028] The output connector unit may further include a plurality of solder pins extending rearward from a rear end of the supporting housing and inserted into the PA board; a ground washer unit provided at a front end of the supporting housing and supporting a rear surface of the antenna board; and a coaxial connector provided in an empty space of the supporting housing and electrically connecting the antenna board to an output end of a resonator panel including a plurality of resonators provided in the cavity.

[0029] Furthermore, the output connector portion can be soldered after the plurality of solder pins are inserted into the front surface of the PA board.

[0030] In addition, a board spacing portion may be formed at a rear end of the supporting housing between the plurality of solder pins to space a rear surface of the filter body and the PA board by a predetermined distance.

[0031] Also, the input connector unit may be coupled to the front surface of the PA board in an SMT manner when the plurality of solder pins of the output connector unit are inserted into the front surface of the PA board.

[0032] A filter for a communications device according to another embodiment of the present invention includes a single base material plate forming a cavity, which is a dielectric-filled space. The base material plate includes a body bottom forming panel forming a bottom portion of the cavity; a resonator panel including a plurality of resonators forming a single layer in the thickness direction within the cavity corresponding to an upper portion of the body bottom forming panel; a frequency tuning panel including a plurality of tuning bars forming a different single layer in the cavity at a predetermined distance in the thickness direction from the single layer formed by the plurality of resonators; and an upper body forming panel covering the upper portion of the frequency tuning panel and forming an upper portion of the cavity. The cavity is formed by the body bottom forming panel, the resonator panel, the frequency tuning panel, and the upper body forming panel being interconnected and folded together via a lower one-side thickness forming panel, a lower other-side thickness forming panel, an upper one-side thickness forming panel, and an upper other-side thickness forming panel that connect them in the thickness direction. At least two of the body bottom forming panel, the resonator panel, the frequency tuning panel, and the upper body forming panel are positioned on the same horizontal plane when fully deployed.

[0033] A method for manufacturing a filter for a communications device according to one embodiment of the present invention includes: a first folding step of folding a lower one-side thickness forming panel and a lower other-side thickness forming panel, the lower one-side thickness forming panel being integrally connected to one and the other widthwise ends of a body bottom forming panel, in the same direction to form a portion including a bottom surface of a cavity; a second folding step of folding a frequency tuning panel including a plurality of tuning bars forming a predetermined single layer in the thickness direction within the cavity after the first folding step, so as to form a different single layer in the thickness direction within the cavity with a plurality of resonators extending perpendicular to the lower one-side thickness forming panel and the other widthwise forming panel; and a third folding step of folding one widthwise end of the upper body forming panel via the upper one-side thickness forming panel and the other widthwise end of the upper body forming panel via the other upper thickness forming panel, so that the other widthwise end is connected to one widthwise end of the frequency tuning panel and an upper end of the lower other thickness forming panel, so as to be spaced a predetermined distance from the tuning bars in the thickness direction of the cavity. [Effects of the Invention]

[0034] According to the filter for a communication device and the manufacturing method thereof according to an embodiment of the present invention, the following various effects can be achieved.

[0035] First, the method for constructing the structure inside the cavity minimizes the need for conventional joining (welding or brazing) methods and allows for a simple folding process, thereby reducing insertion loss that occurs when joining methods are used, thereby improving communication reliability.

[0036] Second, the present invention has the effect of reducing the thickness of the entire antenna device product, thereby enabling the cavity to be formed using a thin base plate of 3t or less, thereby making the product lighter and slimmer. [Brief explanation of the drawings]

[0037] [Figure 1] 1 is a perspective view showing a filter for a communication device according to an embodiment of the present invention; [Figure 2] 2 is an exploded perspective view showing an input port portion and an output port portion coupled to the filter for a communication device of FIG. 1, separated from each other. FIG. [Figure 3A] 2 is an exploded perspective view of the lower part of the filter for a communication device shown in FIG. 1. FIG. [Figure 3B] 2 is an exploded perspective view of the filter for a communication device of FIG. 1; FIG. [Figure 4] 2 is a development view showing a base plate in the configuration of the filter for use in a communication device of FIG. 1. FIG. [Figure 5] FIG. 2 is an internal perspective view of FIG. [Figure 6] FIG. 3 is a cutaway perspective view taken along line AA in FIG. 2. [Figure 7] 2A is a front view of FIG. 1, FIG. 2B is a cross-sectional view taken along line BB, and FIG. 2C is a cutaway perspective view. [Figure 8] 2A is a side view of FIG. 1 and a cutaway perspective view taken along line CC. [Figure 9] FIG. 2 is a perspective view showing a modified example of the frequency tuning panel in the configuration of FIG. [Figure 10] 10 is a side end view for explaining the function of a coupling adjustment bar according to a modified example of the configuration in FIG. 9. FIG. [Figure 11A] 2 is a bottom perspective view of a filter body including an output connector portion for reinforcing the rigidity of a base plate in a folded state in the configuration of FIG. 1. FIG. [Figure 11B] 2 is a top perspective view of a filter body including an output connector portion for reinforcing the rigidity of a base plate in a folded state in the configuration of FIG. 1. FIG. [Figure 12A] FIG. 11B is an exploded perspective view of FIG. 11A. [Figure 12B] FIG. 11C is an exploded perspective view of FIG. 11B. [Figure 13] FIG. 2 is a cutaway perspective view showing the internal space of the cavity. [Figure 14]FIG. 2 is a cutaway perspective view showing the internal space of the cavity. [Figure 15] 2 is a partially cutaway perspective view showing how support pins are utilized during the base plate folding process in the configuration of FIG. 1. FIG. [Figure 16] 10 is a cross-sectional view showing how the filter body is joined to the PA board. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0038] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A filter for a communication device and a method for manufacturing the same according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] 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.

[0040] 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.

[0041] FIG. 1 is a perspective view showing a filter for a communication device according to one embodiment of the present invention, FIG. 2 is an exploded perspective view in which an input port portion and an output port portion to be coupled to the filter for a communication device of FIG. 1 are separated, FIGS. 3A and 3B are an exploded bottom perspective view and an exploded top perspective view of the filter for a communication device of FIG. 1, FIG. 4 is an exploded view showing a base material plate of the configuration of the filter for a communication device of FIG. 1, FIG. 5 is an internal perspective view of FIG. 1, FIG. 6 is a cutaway perspective view taken along line AA of FIG. 2, FIG. 7 is a front view (a) and a cross-sectional view (b) and cutaway perspective view (c) of FIG. 1, and FIG. 8 is a side view (a) and a cutaway perspective view taken along line CC of FIG. 1.

[0042] Generally, in the field of antenna technology, a filter serves to filter out only signals of a specific frequency band from among signals that must be input or output during a transmission / reception process, so that only the signal desired by the consumer (user) is obtained as the result value.

[0043] To filter such signals, a cavity filter, as the name suggests, forms a cavity, which is a predetermined signal filtering section, between an input port where the signal is input and an output port where the signal is output, and obtains a specific band frequency signal value in the section desired by the consumer through a frequency tuning process using the cavity.

[0044] However, until now, in the industry of manufacturing antenna devices, only a method has been disclosed for manufacturing a cavity filter, in which the inside of a filter body made of a ceramic material or a material with higher rigidity is processed to manufacture the above-mentioned cavity, and essential components for frequency filtering, such as a plurality of resonators, are manufactured separately and then fixed inside the cavity.

[0045] However, the filter 100 for a communication device according to one embodiment of the present invention breaks away from the above-mentioned manufacturing method and discloses an innovative technical feature that can minimize insertion loss when a single flat base plate of a predetermined thickness is processed into a sheet metal shape by a press process and then a structure (e.g., a resonator panel 200 including a plurality of resonators 220) is combined within the cavity by a folding process.

[0046] As shown in FIGS. 1 to 4, a filter 100 for a communication device according to an embodiment of the present invention is manufactured in an unfolded state and includes a base plate 105 that forms a cavity C therein when folded.

[0047] Here, the base plate 105 may be made of a conductive plate material having a predetermined thickness or less that forms the inner surface of the cavity C, which is a dielectric-filled space for frequency filtering. The predetermined thickness in this case is preferably 3 t or less, which allows the cavity to be formed by the folding process, has a thickness that is thick enough to firmly maintain the formed cavity, and can prevent an increase in weight.

[0048] On the other hand, the cavity C can be formed by folding at least a part of the base plate 105 (folding step).

[0049] In a filter 100 for a communication device according to one embodiment of the present invention, the base plate 105 includes a body bottom forming panel 110, a lower one-side thickness forming panel 130, a lower other-side thickness forming panel 120, a frequency tuning panel 140, and a body upper forming panel 150, as shown in Figures 1 to 4.

[0050] For the sake of convenience, the following description will be made with reference to terms such as "space" and "position" based on the cavity C formed after folding the base plate 105. It should be made clear that before folding the base plate 105, all of the above-described components can be formed into a sheet metal shape by a press process in a developed form on the same plane. This is also applicable to filters 100 for communication devices according to other embodiments of the present invention, which will be described later.

[0051] More specifically, the body bottom forming panel 110 is configured to form the bottom surface of the cavity C after folding, and one side connector mounting hole 115A and the other side connector mounting hole 115B can be formed in communication with the cavity C for connecting and installing the input connector section 300A and the output connector section 300B described later.

[0052] The lower one-side thickness forming panel 130 and the lower other-side thickness forming panel 120 are folded perpendicularly at the widthwise end of the body bottom forming panel 110, which is formed in a rectangular shape and elongated in the longitudinal direction, to form one widthwise side wall of the cavity C, and can also serve to form the thickness of one widthwise side and the other widthwise side wall, thereby forming the thickness of the other widthwise side.

[0053] Here, the lower one-side thickness forming panel 130 and the lower other-side thickness forming panel 120 are formed to be smaller in width than the body bottom forming panel 110, and therefore, when stacked in an antenna housing part (not shown), it is preferable that they have a slim shape in which the thickness is smaller than the width so that the space occupied by the thickness in the front-to-back direction is further reduced.

[0054] Meanwhile, the frequency tuning panel 140 may be folded so that the other end in the width direction is connected to the upper end of the folded lower one-side thickness forming panel 130, and may have a plurality of tuning bars 146 that form a different single layer in the cavity C, spaced a predetermined distance in the thickness direction from the single layer formed by the plurality of resonators 220 described below.

[0055] That is, as shown in FIG. 4, when the frequency tuning panel 140 is unfolded, it is formed as an extension integral with the lower other side thickness forming panel 120, and when folded, it may be folded so as to be bent perpendicular to the inward direction in which the cavity C is formed.

[0056] Here, assuming that the frequency tuning panel 140 is formed as a hollow rectangular frame penetrating vertically and horizontally except for the edge portions formed along the edges, the plurality of tuning bars 146 formed on the frequency tuning panel 140 may extend from an inner path of one of the widthwise ends or the other widthwise end of the cavity C (in one embodiment of the present invention, the widthwise end adjacent to the lower one-side thickness-forming panel 130), protrude horizontally by a predetermined length toward the other widthwise end, and may be formed spaced apart by a predetermined length from each other in the longitudinal direction of the cavity C.

[0057] The frequency tuning panel 140 can be formed to have a length that overlaps the plurality of resonators 220 and the cavity C in the thickness direction, each of which has a plurality of tuning bars 146 formed on a different single layer.

[0058] On the other hand, as shown in FIG. 4, the frequency tuning panel 140 may further be formed with an L-notch portion 141 that forms a notch due to inductive coupling (hereinafter referred to as an "L-notch") at the right end (high frequency region) of the pass band, and a C-notch portion 142 that forms a notch due to capacitive coupling (hereinafter referred to as a "C-notch") at the left end (low frequency region) of the pass band.

[0059] The L-notch portion 141 and the C-notch portion 142 may be formed to form the same single layer across the thickness of the cavity C and to form the same single layer as the plurality of tuning bars 146 pre-formed in the frequency tuning panel 140. However, the L-notch portion 141 and the C-notch portion 142 may be provided to form a different single layer within the cavity C from the plurality of resonators 220 of the resonator panel 200 described below.

[0060] Furthermore, as shown in FIG. 4, the frequency tuning panel 140 may further include a plurality of coupling adjustment bars 147 formed on the inside of one widthwise end portion and spaced a predetermined distance apart from each other between the plurality of pre-formed tuning bars 146 in the longitudinal direction.

[0061] The coupling adjustment bars 147 are deformed and positioned between the resonators 220 formed on the resonator panel 200 (described later), thereby adjusting the coupling value between the adjacent resonators 220.

[0062] Meanwhile, one-side mounting ribs 149A and other-side mounting ribs 149B may be further formed at both longitudinal ends of the frequency tuning panel 140 so as to interfere with the one-side shielding panel 180A and the other-side shielding panel 180B described later and support the cavity C in the thickness direction.

[0063] In addition, the body upper forming panel 150 is folded to shield the upper surface of the cavity C from the outside, and serves to form the upper inner surface of the cavity C.

[0064] Here, the body upper forming panel 150 may be disposed parallel to the upper portion of the frequency tuning panel 140, which is folded to form a single layer at least within the cavity C, at a predetermined distance.

[0065] For this purpose, an upper one-side thickness forming panel 161 may be integrally formed between one widthwise end of the body upper forming panel 150 and the frequency tuning panel 140 to connect them, and an upper other-side thickness forming panel 162 may be integrally formed at the other widthwise end of the body upper forming panel 150.

[0066] The upper one-side thickness forming panel 161 may be folded upward perpendicular to the inward direction relative to one widthwise end of the frequency tuning panel 140, and the upper other-side thickness forming panel 162 may be folded downward perpendicular to the inward direction relative to the other widthwise end of the body upper forming panel 150, and its lower end may be connected to the upper end of the lower other-side thickness forming panel 120.

[0067] Meanwhile, in the filter 100 for a communication device according to an embodiment of the present invention, the base plate 105 may further include a resonator panel 200 having a plurality of resonators 220 thereon.

[0068] The resonator panel 200 may be provided as a separate member and may be joined to the base plate 105 via a plurality of resonator panel mounting slits 129h formed in either the lower one-side thickness forming panel 130 or the lower other-side thickness forming panel 120, forming a separate single layer spaced a predetermined distance in the thickness direction from the single layer formed by the plurality of tuning bars 146 of the frequency tuning panel 140.

[0069] More specifically, as shown in FIGS. 1 to 4, the resonator panel 200 may include a plurality of resonators 220 that are folded and extended inward perpendicular to the folded lower one-side thickness forming panel 130 and the lower other-side thickness forming panel 120 to form a single layer within the cavity C.

[0070] The resonator panel 200 can be coupled to and installed in one of the lower one-side thickness forming panel 130 and the lower other-side thickness forming panel 120 through a plurality of resonator panel mounting slits 129h formed to penetrate the cavity C from the inside to the outside.

[0071] As shown in FIG. 3A, the resonator panel 200 includes a resonator connecting bar 210 that horizontally connects a plurality of resonators 220 in the longitudinal direction of the cavity C, a plurality of insertion ends 215 provided at outer ends of the resonator connecting bar 210 and inserted into the resonator panel mounting slits 129h, and resonance characteristic ends 230 extended from the ends of the plurality of resonators 220.

[0072] Meanwhile, the insertion ends 215 provided at the outer end of the resonator connecting bar 210 may be inserted into the resonator panel mounting slits 129h from the inside where the cavity C is provided, and then joined by either a brazing method or a welding method.

[0073] 1 to 4, the base plate 105 may further include a one-side shielding panel 180A integrally formed at one longitudinal end of the body bottom forming panel 110 and folded, and having three sides connected to one longitudinal end of the lower one-side thickness forming panel 130 in the folded state, one longitudinal end of the lower other-side thickness forming panel 120 in the folded state, and one longitudinal end of the frequency tuning panel 200 in the folded state; and an other-side shielding panel 180B integrally formed at the other longitudinal end of the body bottom forming panel 110 and folded, and having three sides connected to the other longitudinal end of the lower one-side thickness forming panel 130 in the folded state, the other longitudinal end of the lower other-side thickness forming panel 120 in the folded state, and the other longitudinal end of the frequency tuning panel 140 in the folded state.

[0074] On the other hand, the one-side shielding panel 180A and the other-side shielding panel 180B may be formed with one-side rib through slits 189A and other-side rib through slits 189B into which the one-side mounting rib 149A and other-side mounting rib 149B formed at both longitudinal ends of the frequency tuning panel 140 are inserted, as shown in Figures 1 to 4.

[0075] In filter 100 for a communication device according to one embodiment of the present invention, one side shielding panel 180A and the other side shielding panel 180B are defined as having three sides in that the vertical cross-sectional shape of base plate 105 in the folded state is formed into a rectangle (oblong) including the surface occupied by body bottom forming panel 110, but this is not limited thereto and can be understood as having sides corresponding to the vertical cross-sectional shape formed by cavity C. For example, if the vertical cross-sectional shape of cavity C is triangular, one side shielding panel 180A and the other side shielding panel 180B can be triangular shaped excluding the side (surface) occupied by body bottom forming panel 110 and have two sides.

[0076] FIG. 9 is a perspective view showing a modified example of the frequency tuning panel in the configuration of FIG. 1, and FIG. 10 is a side end view for explaining the function of the modified coupling adjustment bar in the configuration of FIG.

[0077] As described above, the frequency tuning panel 140 may be further formed with a plurality of coupling adjustment bars 147 extending from the inner end of one widthwise side to the inner end of the other widthwise side, and extending between adjacent tuning bars 146 to form the same single layer as the plurality of tuning bars 146.

[0078] Here, the multiple coupling adjustment bars 147 shown in Figures 5 to 8 are formed to extend from the inner edge of one widthwise end of the frequency tuning panel 140 and extend at least less than the tips of the multiple tuning bars 146. However, as shown in Figures 9 and 10, the multiple coupling adjustment bars 147 formed on a modified frequency tuning panel 140 may be configured to extend from the inner edge of one widthwise end of the frequency tuning panel 140 and be connected to the inner edge of the other widthwise end.

[0079] As shown in FIG. 10, the coupling adjustment bar 147 of the frequency tuning panel 140 according to the above modification can be deformed from the top to the bottom in the thickness direction of the cavity C by a designer who tunes the minute frequency in the cavity C, and can adjust the coupling value by interfering with the adjacent resonators 220 in the signal flow path.

[0080] Meanwhile, as shown in FIGS. 1 to 8, a filter 100 for a communication device according to an embodiment of the present invention may further include a plurality of tuning holes 151 and notch adjustment holes 152 formed in the upper body forming panel 150 and communicating with the cavity C.

[0081] The plurality of tuning holes 151 are formed at positions corresponding to the plurality of tuning bars 146 provided inside the cavity C, and by inserting a predetermined tuning tool (not shown) through the plurality of tuning bars 146 to deform the shape of the plurality of tuning bars 146, the separation distance between the plurality of resonators 220 provided in different single layers can be adjusted, thereby tuning the fine frequency.

[0082] In addition, multiple notch adjustment holes 152 are formed at positions corresponding to the L-notch portion 141 and the C-notch portion 142 that are provided to form a single layer inside the cavity C, and a predetermined coupling adjustment tool (not shown) can be inserted through the multiple notch adjustment holes 152 to deform the shape of either the L-notch portion 141 or the C-notch portion 142 to achieve the desired passband notch as designed.

[0083] Figures 11A and 11B are bottom and top oblique views of a filter body including an output connector portion for reinforcing the rigidity of the base plate in the folded state in the configuration of Figure 1, Figures 12A and 12B are exploded oblique views of Figures 11A and 11B, Figures 13 and 14 are cutaway oblique views showing the internal space of the cavity, Figure 15 is a partially cutaway oblique view showing how the support pins are used during the folding process of the base plate in the configuration of Figure 1, and Figure 16 is a cross-sectional view showing how the filter body is joined to the PA board.

[0084] 11A and 11B to 16, in a filter 100 for a communication device according to one embodiment of the present invention, a base plate 105 is formed into a filter body having the cavity C therein by a folding process, and the filter body may further include an input connector unit 300A, 1300A that is disposed between a PA board (PCB) and an antenna board (not shown) having a plurality of radiating elements disposed in front thereof, and that inputs a predetermined electrical signal transmitted from the PA board (PCB) to one side of the cavity C, and an output connector unit 300B, 1300B that receives a predetermined electrical signal transmitted from the other side of the cavity C and outputs it to the antenna board.

[0085] As shown in FIG. 12B, the input connector portion 300A, 1300A may include a Teflon portion 1310A interposed in the input connector mounting hole 115A, and a connecting pin 1330A that passes through the Teflon portion 1310A and is connected to any one of the multiple resonators 200 inside the cavity C.

[0086] Meanwhile, the output connector units 300B and 1300B may be provided with the same configuration as the input connector units 300A and 1300A, but as will be described later, they can be modified and installed in a form that minimizes the transmission of external forces between the antenna board and the filter body.

[0087] More specifically, the output connector portion 1300B can include a supporting housing 1310B, as shown in Figures 11A, 11B to 16, that transmits the vertical pressure acting on the filter body of the antenna board when stacked against the front surface to the PA board (PCB) without transmitting it to the filter body.

[0088] The supporting housing 1310B may be formed as a hollow cylinder that penetrates the entire thickness of the rear and front portions of the cavity C (limited to the case where the antenna board is located at the front and the PA board (PCB) is located at the rear), with its rear end connected to the front of the PA board (PCB) and its front end connected to the rear surface of the antenna board.

[0089] Additionally, supporting housing 1310B is preferably made of a rigid material that is stronger than the filter body.

[0090] Therefore, when the antenna board is laminated and bonded to the front surface of the filter body, the external force transmitted from the assembler or automatic assembly jig (etc.) is not transmitted to the filter body, which is relatively thin and slim (less than 3t), and therefore has weak rigidity, but is transmitted directly to the PA board (PCB), providing the advantage of preventing deformation during assembly.

[0091] Here, the output connector portion 1300B may include a plurality of solder pins 1320B extending rearward from the rear end of the supporting housing 1310B and inserted into a PA board (PCB), a ground washer portion 1350B provided at the front end of the supporting housing 1310B and supporting the rear surface of the antenna board, and a coaxial connector 1330B provided in the empty space of the supporting housing 1310B and electrically connecting the output end 240 of the resonator panel 200 including a plurality of resonators 220 provided in the cavity C to the antenna board.

[0092] The coaxial connector 1330B includes a terminal pin (not shown in the drawing) for electrical connection with the antenna board, and a connector 1340B can be formed in communication with the supporting housing 1310B for inserting the output end 240 of the resonator panel 200 described above.

[0093] On the other hand, the output connector section 1300B can be soldered after a plurality of solder pins 1320B are inserted into the front surface of a PA board (PCB) as shown in FIG.

[0094] Here, as shown in FIG. 16, the rear end of the supporting housing 1310B may be formed with a board separation portion 1360B formed between the plurality of solder pins 1320B to separate the rear surface of the filter body from the PA board (PCB) by a predetermined distance.

[0095] Therefore, since the board separation portion 1360B separates the filter body from the PA board (PCB) (see reference symbol "L" in Figure 16), it is possible to provide the advantage of being able to use both sides of the PA board (PCB) provided in a typical printed circuit board without any restrictions.

[0096] Meanwhile, the input connector portion 1300A is preferably configured to be coupled to the front surface of the PA board (PCB) in an SMT manner when the plurality of solder pins 1320B of the output connector portion 1300B are inserted into the front surface of the PA board (PCB).

[0097] 15, pinholes 116h, 236h, and 156h are formed in the bottom body forming panel 110, the plurality of resonators 220, and the top body forming panel 150, respectively, penetrating in the vertical direction, and support pins 400 can be installed through the pinholes 116h, 236h, and 156h when folding the base plate 105 to form the cavity C. That is, the support pins 400 are inserted into the pinholes 116h, 236h, and 156h so that each portion is folded at the correct position during the folding process, and are then removed once the folding process is completed, so as not to affect frequency filtering and tuning within the cavity C.

[0098] A method for manufacturing a filter for a communication device according to an embodiment of the present invention will now be described.

[0099] That is, as shown in FIGS. 1 to 16, a method for manufacturing a filter for a communication device according to one embodiment of the present invention includes a first folding step of folding a lower one-side thickness forming panel 130 and a lower other-side thickness forming panel 120, which are integrally connected to one and the other widthwise ends of a body bottom forming panel 110, in the same direction so as to form a part including the bottom surface of a cavity C; and after the first folding step, folding a frequency tuning panel 140 including a plurality of tuning bars 146 that form a predetermined single layer in the thickness direction within the cavity C, between a plurality of lower one-side thickness forming panel 130 and a plurality of lower other-side thickness forming panels 120 extending perpendicularly to the lower one-side thickness forming panel 130 and the lower other thickness forming panel 120. The method includes a second folding step of folding the resonator 220 and the cavity C so as to form different single layers in the thickness direction; and a third folding step of folding one widthwise end of the upper body forming panel 150 with the upper one-side thickness forming panel 162 interposed therebetween, and folding the other widthwise end of the upper body forming panel 150 with the upper other-side thickness forming panel 161 interposed therebetween, so as to be spaced a predetermined distance from the plurality of tuning bars 146 in the thickness direction of the cavity C, and folding the other widthwise end of the upper body forming panel 150 so as to be connected to one widthwise end of the frequency tuning panel 140 and the upper end of the lower other-side thickness forming panel 120.

[0100] It can be seen that the detailed folding process of the remaining configurations may be additionally performed with reference to FIG.

[0101]

[0023] A filter for a communication device and a method for manufacturing the same according to one embodiment of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiment, and various modifications and equivalent changes 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]

[0102] The present invention provides a filter for communication devices and a method for manufacturing the same that can minimize the conventional bonding steps for forming a cavity and providing a structure such as a resonator within the cavity, thereby reducing the amount of insertion loss due to the coupling of two physical structures. [Explanation of symbols]

[0103] 100: Filter for communication equipment, 105: Base plate 110: Body bottom forming panel, 120: Lower other side thickness forming panel 130: Lower one side thickness forming panel, 140: Frequency tuning panel 146: Tuning bar, 147: Coupling adjustment bar 150: Upper body forming panel, 151: Tuning hole 152: Notch adjustment hole, 161: Upper other side thickness forming panel 162: Upper one-side thickness forming panel, 180A: One-side shielding panel 180B: other side shielding panel, 200: resonator panel 210: Resonator connecting bar, 220: Resonator 230: Resonator characteristic end, 300A, 1300A: Input connector part 300B, 1300B: Output connector, 400: Support pin 1310B: supporting housing part, 1320B: solder pin 1330B: Coaxial connector, 1340B: Connector 1350B: Ground washer part, 1360B: Board separation part

Claims

1. a single base plate made of a conductive plate material having a predetermined thickness or less, which forms an inner surface of a cavity for performing frequency filtering; The cavity is formed by folding at least a portion of the base plate.

2. The base plate is a body bottom forming panel that forms a bottom surface of the cavity; a lower one-side thickness forming panel and a lower other-side thickness forming panel that are folded in the same direction at one widthwise end and the other widthwise end of the body bottom forming panel to form a part of the cavity; a frequency tuning panel having a plurality of tuning bars, the other widthwise end of which is integrally connected to the folded lower other-side thickness forming panel and one widthwise end of which is folded to be connected to an upper end of the folded lower one-side thickness forming panel, and the tuning bars forming a different single layer at a predetermined distance in the thickness direction from the single layer of the plurality of resonators formed in the cavity; 2. The filter for a communication device of claim 1, further comprising: an upper body forming panel, one widthwise end of which is folded with an upper one-side thickness forming panel interposed therebetween and the other widthwise end of which is folded with an upper other-side thickness forming panel interposed therebetween so as to be spaced a predetermined distance from the plurality of tuning bars in a thickness direction of the cavity, the other widthwise end of which is connected to one widthwise end of the frequency tuning panel and an upper end of the lower other-side thickness forming panel.

3. The base plate is 3. The filter for a communication device according to claim 2, further comprising a resonator panel extending perpendicular to the folded lower one-side thickness forming panel and the folded lower other-side thickness forming panel, the resonator panel including the plurality of resonators forming a single layer within the cavity.

4. 4. The filter for a communication device according to claim 3, wherein the resonator panel is coupled to and installed in a plurality of resonator panel mounting slits formed to penetrate one of the lower one-side thickness forming panel and the lower other-side thickness forming panel from the inside to the outside of the cavity.

5. The resonator panel comprises: a resonator connection bar that connects the plurality of resonators horizontally in a longitudinal direction of the cavity; a plurality of insertion ends provided at outer ends of the resonator connecting bars and inserted into the resonator panel mounting slits; 5. The filter for a communication device according to claim 4, further comprising: a resonance characteristic end formed to extend from each of the tips of the plurality of resonators.

6. 6. The filter for a communication device according to claim 5, wherein the plurality of insertion ends are joined by one of a brazing method and a welding method after being inserted into the plurality of resonator panel mounting slits.

7. 3. The filter for a communications device according to claim 2, wherein at least two of the body bottom forming panel, the lower one-side thickness forming panel, the lower other-side thickness forming panel, the resonator panel, the frequency tuning panel, the upper one-side thickness forming panel, the upper other-side thickness forming panel, and the body upper forming panel are positioned on the same horizontal plane when fully deployed.

8. a one-side shielding panel integrally formed at one longitudinal end of the body bottom forming panel and folded, the one-side shielding panel having three sides connected to one longitudinal end of the lower one-side thickness forming panel in a folded state, one longitudinal end of the lower other-side thickness forming panel in a folded state, and one longitudinal end of the frequency tuning panel in a folded state; 3. The filter for a communication device according to claim 2, further comprising: an other-side shielding panel integrally formed on the other longitudinal end of the body bottom forming panel and folded, the other longitudinal end of the lower one-side thickness forming panel in a folded state, the other longitudinal end of the lower other-side thickness forming panel in a folded state, and the other longitudinal end of the frequency tuning panel in a folded state.

9. 3. The filter for a communication device according to claim 2, wherein the frequency tuning panel is integrally formed with one of the lower one-side thickness forming panel and the lower other-side thickness forming panel to which the resonator panel is coupled.

10. The frequency tuning panel is formed in a rectangular hollow frame shape with a vertically penetrating shape, 10. The filter for a communication device according to claim 9, wherein the plurality of tuning bars of the frequency tuning panel extend from an inner end of one widthwise side to an inner end of the other widthwise side and extend to form a single layer in a thickness direction of the cavity.

11. 11. The filter for a communication device according to claim 10, wherein the frequency tuning panel is formed to have an elongated length such that the frequency tuning panel overlaps the plurality of resonators, each having the plurality of tuning bars formed in a single layer, in a thickness direction of the cavity.

12. 11. The filter for a communication device of claim 10, wherein a plurality of coupling adjustment bars are further formed on the frequency tuning panel, extending from an inner end of one widthwise side to an inner end of the other widthwise side, and forming a single layer with the plurality of tuning bars between adjacent tuning bars among the plurality of tuning bars.

13. The filter for a communication device according to claim 12 , wherein the plurality of coupling adjustment bars extend from an inner end of one width direction of the frequency tuning panel and are connected to an inner end of the other width direction of the frequency tuning panel.

14. the body bottom forming panel, the plurality of resonators, and the body upper forming panel each have a pinhole formed therethrough in a vertical direction; The filter for a communication device according to claim 11, wherein support pins can be installed through the pinholes when the base plate is folded to form the cavities.

15. the base plate is folded to form a filter body having the cavity therein, the filter body being disposed between a PA board and an antenna board having a plurality of radiating elements disposed in front of the PA board; an input connector portion for inputting a predetermined electrical signal transmitted from the PA board into one side of the cavity; an output connector portion that receives a predetermined electrical signal transmitted from the other side of the cavity and outputs the received signal to the antenna board, 3. The filter for a communication device according to claim 2, wherein the output connector portion includes a supporting housing through which vertical pressure acting on the filter body of the antenna board when the filter body is laminated and joined to the front surface of the antenna board is transmitted to the PA board without being transmitted to the filter body.

16. 16. The filter for a communication device according to claim 15, wherein the supporting housing is formed in a hollow cylindrical shape that penetrates through both the rear and front portions of the cavity in the thickness direction, with the rear end connected to the front surface of the PA board and the front end connected to the rear surface of the antenna board.

17. 16. The filter for a communication device according to claim 15, wherein the supporting housing is made of a rigid material having a strength greater than that of the filter body.

18. The output connector unit a plurality of solder pins extending rearward from the rear end of the supporting housing and inserted into the PA board; a ground washer provided at a front end of the supporting housing to support a rear surface of the antenna board; 18. The filter for a communication device according to claim 17, further comprising: a coaxial connector provided in the empty space of the supporting housing, the coaxial connector electrically connecting an output end of a resonator panel including a plurality of resonators provided in the cavity to the antenna board.

19. 20. The filter for a communications device according to claim 18, wherein the output connector portion is soldered after the plurality of solder pins are inserted into a front surface of the PA board.

20. 19. The filter for a communication device according to claim 18, wherein a board separation portion is formed at a rear end of the supporting housing between the plurality of solder pins, and separates a rear surface of the filter body from the PA board by a predetermined distance.

21. The input connector unit includes:

19. The filter for a communication device according to claim 18, wherein the plurality of solder pins of the output connector portion are coupled to the front surface of the PA board in an SMT manner when inserted into the front surface of the PA board.

22. a single base plate forming a cavity that is a dielectric-filled space; The base plate is a body bottom forming panel that forms a bottom surface of the cavity; a resonator panel including a plurality of resonators forming a single layer in a thickness direction within the cavity corresponding to an upper portion of the body bottom forming panel; a frequency tuning panel including a plurality of tuning bars forming a single layer formed by the plurality of resonators in the cavity and spaced apart from each other by a predetermined distance in a thickness direction; a body upper forming panel that covers an upper portion of the frequency tuning panel and forms an upper surface of the cavity, a filter for a communications device, wherein the cavity is formed by folding the body bottom forming panel, the resonator panel, the frequency tuning panel, and the body upper forming panel together in a thickness direction via a lower one-side thickness forming panel, a lower other-side thickness forming panel, an upper one-side thickness forming panel, and an upper other-side thickness forming panel, which connect the body bottom forming panel, the resonator panel, the frequency tuning panel, and the body upper forming panel, and at least two of the body bottom forming panel, the resonator panel, the frequency tuning panel, and the body upper forming panel are positioned on the same horizontal plane when fully deployed.

23. a first folding step of folding a lower one-side thickness forming panel and a lower other-side thickness forming panel, which are integrally connected to one and the other widthwise ends of the body bottom forming panel, in the same direction to form a portion including a bottom surface of the cavity; a second folding step of folding a frequency tuning panel including a plurality of tuning bars forming a predetermined single layer in a thickness direction within the cavity after the first folding step, so as to form a different single layer in a thickness direction within the cavity with a plurality of resonators extending perpendicular to the lower one-side thickness forming panel and the lower other-side thickness forming panel; and a third folding step of folding one widthwise end of the upper body forming panel with an upper one-side thickness forming panel interposed therebetween so as to be spaced a predetermined distance from the plurality of tuning bars in a thickness direction of the cavity, and folding the other widthwise end of the upper body forming panel with an upper other-side thickness forming panel interposed therebetween, and folding the other widthwise end so as to be connected to one widthwise end of the frequency tuning panel and an upper end of the lower other-side thickness forming panel.

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