Filter for communication device

Abstract

Disclosed, according to various embodiments of the present invention, is a filter for a communication device, the filter comprising: a filter body including a cavity; and a resonator for filter tuning, the resonator being fixed to the bottom surface of the cavity, having a hollow space formed therein, and provided with a resonance bar made of a material which shape-changes in the cavity due to the external force applied via the hollow space and allows frequency to be adjusted.

Description

Filters for communication devices

[0001] The present invention relates to a filter for communication devices, and more specifically, to a filter for communication devices capable of supporting 5G / 6G by overcoming the disadvantages of a ceramic wave guide filter and incorporating the advantages of a general air cavity filter, without the need for a separate tuning screw and a fixing nut for fixing the same for frequency tuning.

[0002] Tuning screws have been used for decades to vary the frequency characteristics of filters for communication devices, but the use of tuning screws presents difficulties in automated production. Accordingly, many studies and results on methods for varying (tuning) the frequency of filters without using tuning screws have been applied for and disclosed as patents.

[0003] More specifically, conventional filters for communication devices adopt a method of setting a target frequency of the filter for communication devices and adjusting the frequency downward due to a structural problem. This is a method of adjusting the frequency downward by increasing the capacitance by reducing the distance (gap) between all or part of the resonator in the cavity and the filter tuning cover. However, it is very difficult to apply a method of adjusting the frequency upward to restore part of the resonant frequency adjustment part (e.g., the stamping part of the filter tuning cover) made of a conductive material (metal) once it is deformed.

[0004] To solve these problems, additional structures are sometimes used, but these additional structures lead to the problem of making it difficult to maintain the frequency characteristics of the filter the same in high or low temperature conditions, and thus there are no successful cases of actual commercialization.

[0005] Meanwhile, advanced countries around the world have deployed the MMR System, a Massive MIMO technology, to secure data processing capacity when deploying 5G. However, technical limitations in deploying the mmWave band have limited its adoption to pilot deployments, and the high cost and low efficiency of the 3.5 GHz band have hindered expansion in less developed countries. However, the continued advancement of technologies such as artificial intelligence, autonomous driving, and the Internet of Things (IoT) has made the expansion of high-speed communication networks an essential requirement.

[0006] Accordingly, wireless carriers and system builders are competing to develop more advanced technologies, such as 5.5G and 6G. 5.5G is being discussed in the 6-7GHz band, while 6G is being discussed in the 12-13GHz band, and the technology is being promoted to utilize 128 / 256 Massive MIMO technology. Accordingly, demand for RF filters is expected to increase four to eight times compared to 5G, and product sizes must be reduced to one-eighth of the 5G size.

[0007] However, in the case of a general cavity filter, a resonance value is formed by configuring a metal R / B (resonant element) in the air cavity, and thus, there is a disadvantage in that there is a limit to the miniaturization of the product.

[0008] In particular, in the case of Ceramic Wave Guide Filters, a material suitable for miniaturization, a metal film is formed on the ceramic outer wall to form a resonance value. However, Ceramic Wave Guide Filters not only generate high-frequency noise, but also have the disadvantages of relatively high loss and low attenuation performance.

[0009]

[0010] The present invention has been devised to solve the above-mentioned technical problem, and its purpose is to provide a filter for a communication device that can significantly reduce the production cost of the product because it does not require the installation of additional structures such as a separate tuning screw and a fixing nut for fixing the same.

[0011] In addition, another purpose of the present invention is to provide a filter for communication devices capable of manufacturing small products corresponding to 5G / 6G by overcoming the disadvantages of ceramic wave guide filters and incorporating the advantages of air cavity filters.

[0012] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0013] A filter for a communication device according to one embodiment of the present invention includes a filter body including a cavity, and a filter tuning resonator having a resonance bar made of a material that is fixed to a bottom surface of the cavity, has a hollow formed therein, and can adjust a frequency while causing an external change in the cavity by an external force applied through the hollow.

[0014] Here, the material of the resonance bar may include a conductive material.

[0015] Additionally, the resonance bar can be press-fitted and fixed into a frequency variable hole formed on the lower surface of the filter body via a circular press-fit fixing ring.

[0016] Additionally, the resonance bar can be integrally formed into the filter body by a deep drawing press process.

[0017] In addition, the resonator for filter tuning can be adjusted to shift the frequency upward by continuously applying annular pressure to the inner surface corresponding to the relatively lower part within the hollow of the resonant bar to change its shape.

[0018] In addition, the resonator for filter tuning can be adjusted to shift the frequency downward by continuously applying annular pressure to the inner surface corresponding to the relatively upper portion within the hollow of the resonant bar to change its shape.

[0019] In addition, the resonator for filter tuning can be adjusted to shift the frequency upward by applying pressure to a position spaced apart from a predetermined angle in the circumferential direction at the same height on the inner surface corresponding to the relatively lower part within the hollow of the resonant bar to change its shape.

[0020] In addition, the resonator for filter tuning can be adjusted to shift the frequency downward by applying pressure to a position spaced apart from a predetermined angle in the circumferential direction at the same height on the inner surface corresponding to the relatively upper part within the hollow of the resonant bar to change its shape.

[0021] In addition, the resonance bar has at least one shape-deforming slot formed spaced apart in the circumferential direction as a portion located inside the cavity and connecting the hollow and the cavity, and the filter tuning resonator can adjust the frequency by changing the shape by pressing the shape-deforming slot in an outward direction from the hollow.

[0022] Additionally, the direction of movement of the frequency can be determined depending on the relative position of the shape-deforming slot in the hollow of the resonant bar.

[0023] In addition, an installation boss having a frequency variable hole formed on the lower surface of the filter body that communicates with the hollow of the resonant bar is provided, and the shape-deforming slot can be shaped by a pressurized block that can move through the frequency variable hole of the installation boss.

[0024] Additionally, the shape-deforming slot may be formed to protrude into the hollow of the resonant bar so as to be interfered with by the outer surface of the pressurized block.

[0025] In addition, the filter body further includes a filter tuning cover that covers the opened upper side and has a tuning hole formed therein that communicates with the cavity, and the shape-deforming slot can be shaped-deformed by a pressurizing device that can pressurize the hollow portion of the resonance bar in the radial direction after being introduced through the tuning hole of the filter tuning cover.

[0026] In addition, the resonance bar is provided in the form of a metal panel connected by a pair of shape-deforming legs, and the frequency can be adjusted by changing the external shape of the pair of shape-deforming legs.

[0027] In addition, the filter tuning resonator may further include a frequency tuning block in which the upper part of the hollow portion of the resonant bar is opened to communicate with the cavity, the lower part of the hollow portion of the resonant bar is opened to communicate with the outside of the filter body, and is provided to be able to move up and down in the hollow portion of the resonant bar, and at least a portion of the frequency tuning block protrudes toward the cavity through the upper part of the hollow portion of the resonant bar to cause a change in appearance.

[0028] In addition, the resonator for filter tuning may further include a dielectric part interposed between the outer surface of the frequency tuning block and the hollow inner surface of the resonant bar.

[0029] In addition, the filter body is formed to have one side open, and further includes a filter tuning cover coupled to the opened one side of the filter body to cover the resonance bar, and the filter tuning cover is provided with a dielectric layer of a ceramic material having a predetermined thickness, and an outer surface of the filter tuning cover with respect to the cavity is coated with a metal film, and an inner surface of the filter tuning cover with respect to the cavity is coated with the metal film only in a portion that comes into contact with the upper surface of the resonance bar.

[0030] Additionally, the metal film in contact with the upper surface of the resonant bar may be a resonant disk panel coated to have a larger area than the upper surface of the resonant bar.

[0031] In addition, the resonance disk panel coated on the upper surface of the resonance bar and the filter tuning cover can be joined by either a soldering method or a brazing welding method.

[0032] In addition, a plurality of cavities are formed inside the filter body, a plurality of resonance bars are provided in each of the plurality of cavities, the plurality of resonance bars are formed integrally with the filter body, and the filter body may have an inner surface and an outer surface including the plurality of resonance bars entirely coated with a metal film.

[0033] Additionally, a coupling variable bar formed integrally with the filter body may be further formed between adjacent resonance bars among the plurality of resonance bars.

[0034] In addition, on the outer surface of the filter tuning cover, a circular input port film portion and an output port film portion that are electrically insulated from the metal film are formed, and the input port film portion and the output port film portion can be electrically connected to the input terminal and the output terminal of an external PCB, respectively.

[0035] In addition, a coupling pattern portion made of a conductive material for coupling between the plurality of resonant bars may be integrally formed inside the dielectric layer made of the ceramic material forming the filter tuning cover or on the upper layer of the dielectric layer.

[0036] In addition, a C-notch pattern portion made of a conductive material that couples between the plurality of resonant bars to form a C-notch may be integrally formed inside the dielectric layer made of the ceramic material forming the filter tuning cover or on an upper portion of the dielectric layer.

[0037] In addition, the filter body is formed to have one side open, and further includes a PCB cover panel coupled to the opened side of the filter body to cover the resonant bar, and a resonant disk panel printed to be in contact with the upper surface of the resonant bar and have a larger area than the upper surface of the resonant bar, and a coupling pattern portion for coupling between adjacent resonant bars may be printed on the lower surface of the PCB cover panel.

[0038] In addition, the filter body is further provided with a connecting portion that is electrically connected to an external configuration, and the connecting portion can be integrally formed with the filter body.

[0039] In addition, the resonance bar further includes a frequency tuning block that is provided to be able to move up and down in the hollow portion, and a screw thread may be formed on the outer surface of the frequency tuning block by processing, and a screw thread that is combined with the screw thread of the frequency tuning block may be formed by tap processing on the inner surface forming the hollow portion of the resonance bar.

[0040] According to a filter for a communication device according to one embodiment of the present invention, the following effects can be achieved.

[0041] First, it has the effect of enabling the production of slim products that can support 5G / 6G by combining the high-frequency band attenuation value and low loss value characteristics of a general Cavity Filter with the miniaturization manufacturing characteristics of a Ceramic Wave Guide Filter.

[0042] Second, it has the effect of reducing the production cost of the product because parts such as tuning screws or nuts for fixing tuning screws can be omitted.

[0043]

[0044] Figure 1 is a cross-sectional view showing a resonant bar within a cavity of a filter for a general communication device.

[0045] FIG. 2 is a cross-sectional view showing a first filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0046] Figure 3 is a frequency characteristic graph when the frequency is adjusted upward and downward.

[0047] FIG. 4 is a cross-sectional view showing a second filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0048] Fig. 5 is a cross-sectional view showing the installation structure of a third filter tuning resonator of a star type for a filter body.

[0049] Fig. 6 is a cross-sectional view showing the molding appearance of the integrated first filter tuning resonator for the filter body.

[0050] Fig. 7 is a cross-sectional view showing a fourth filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0051] Fig. 8 is a cross-sectional view showing a fifth filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0052] FIG. 9 is a perspective view showing a sixth filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0053] Fig. 10 is a cross-sectional view showing a seventh filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0054] Fig. 11 is a perspective view showing a first filter tuning resonator of a filter for a communication device according to a second embodiment of the present invention.

[0055] Fig. 12 is a cutaway perspective view taken along line AA of Fig. 11.

[0056] Fig. 13 is a cross-sectional view taken along line AA of Fig. 11,

[0057] Fig. 14 is a perspective view showing a filter for a communication device according to a second embodiment of the present invention.

[0058] Figure 15 is an exploded perspective view of Figure 14,

[0059] Fig. 16 is a cross-sectional view taken along line BB of Fig. 14.

[0060] Fig. 17 is a cutaway perspective view taken along line CC of Fig. 14,

[0061] Fig. 18 is a cutaway perspective view taken along line DD of Fig. 14.

[0062] Fig. 19 is a cutaway perspective view taken along the CC line of Fig. 14, with the filter tuning cover made transparent.

[0063] FIG. 20 is a cutaway perspective view taken along the CC line of FIG. 14, showing an upward perspective view of a resonant disk panel among the components of a filter for a communication device according to the second embodiment of the present invention.

[0064] Fig. 21 is a perspective projection view of the filter tuning cover of Fig. 14 made transparent.

[0065] FIG. 22 is a bottom view (a) (c) and a cross-sectional view (b) of an implementation example in which a port connection pin is connected to a PCB cover panel among the configurations of a filter for a communication device according to a third embodiment of the present invention.

[0066] FIG. 23 is a bottom view (a) (c) and a cross-sectional view (b) of an implementation example in which a port extension part is connected to the side of a filter body among the configurations of a filter for a communication device according to a third embodiment of the present invention.

[0067] Fig. 24 is a cross-sectional view for explaining the frequency adjustment of a filter for a communication device according to the third embodiment of the present invention.

[0068]

[0069] <Explanation of symbols>

[0070] 100: First embodiment 110: Filter body

[0071] 120: Filter tuning cover 130: Resonator for filter tuning

[0072] 131: Resonance bar 200: Second embodiment

[0073] 210: Filter body 220: Filter tuning cover

[0074] 225: Resonant disk panel 230: Resonator for filter tuning

[0075] 231: Resonant bar 232: C-notch pattern section

[0076] 233: Resonance Bar Block 237D: Shape Deformation Slot

[0077] 260: Coupling pattern part 320: PCB cover pattern

[0078] 325: Resonant disk panel 400A, 400B: Connecting part

[0079] 410A, 410B: Dielectric block 420A: Port pin

[0080] 420B: Port extension

[0081]

[0082] Hereinafter, a filter for a communication device according to one embodiment of the present invention will be described in detail with reference to the attached drawings.

[0083] When assigning reference numerals to components in each drawing, it should be noted that identical components are assigned the same numerals whenever possible, even if they appear on different drawings. Furthermore, when describing embodiments of the present invention, if a detailed description of a related known configuration or function is deemed to hinder understanding of the embodiments of the present invention, the detailed description will be omitted.

[0084] 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 only intended to distinguish the components from other components, and do not limit the nature, order, or sequence 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 as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0085]

[0086] Figure 1 is a cross-sectional view showing a resonant bar within a cavity of a filter for a general communication device.

[0087] A filter (1) for a typical wireless communication device is configured to adjust the frequency characteristics of each resonator by having a frequency adjustment screw (tuning screw).

[0088] However, with the recent advancement of wireless communication technology, the frequency of use has increased several times as it has evolved from 5G to 6G, and accordingly, the size of the filter used in wireless equipment has to be reduced to several times or less, which is a challenge.

[0089] The difficulty of such miniaturization manufacturing is that it not only leads to spatial constraints in the placement of a large number of frequency adjustment screws (tuning screws) when manufacturing filters, but it is also clear that adjusting (tuning) these can be a huge challenge in design.

[0090] First, a filter (1) for a general communication device, as shown in Fig. 1, has a resonator (30) extended so that its tip is positioned at a predetermined height from the bottom surface inside a cavity (C) formed by a filter body (10), and a tuning screw (T / S, Tuning Screw, 50) mounted on a filter tuning cover (20) adjusts the distance from the tip of the resonator (30) to perform frequency tuning. Here, a resonator disk panel (40) in the form of a circular metal panel is provided on the top of the resonator (30), and the resonator (30) can be manufactured as a separate product and then fixed to a resonator installation boss (60) pre-formed on the bottom surface of the cavity (C) of the filter body (10).

[0091] However, as already explained in the 'Background Technology of the Invention' section, when a tuning screw (50) is provided, it is very difficult to design a miniaturized product, so the filter (100, 200) for communication devices according to the present invention proposes a structure that enables frequency tuning by a new filter tuning resonator (130) that excludes the tuning screw (50) and an additional structure for fixing it from the beginning.

[0092] FIG. 2 is a cross-sectional view showing a first filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention, and FIG. 3 is a frequency characteristic graph when the frequency is adjusted upward and downward.

[0093] A filter (100) for a communication device according to one embodiment of the present invention, as shown in FIG. 2, includes a filter body (110) including a cavity (C), and a first filter tuning resonator (130A) provided with a resonance bar (131) made of a material that is fixed to the bottom surface of the cavity (C), has an internal hollow (S) formed therein, and can adjust the frequency while causing an external change in the cavity (C) by an external force applied through the hollow (S).

[0094] Here, the material (material) of the resonant bar (131) may include a conductive material. In addition, the resonant bar (131) may be formed in a cylindrical shape with a closed top. However, the resonant bar (131) does not necessarily have to have a closed top structure, and as referenced in FIGS. 8 and 10 described below, it may also be provided so that the top is in communication with the cavity (C).

[0095] Referring to (a) of FIG. 2 and (a) of FIG. 3, the resonance bar (130A) for tuning the first filter can be adjusted to shift the frequency upward by continuously applying circular pressure to the inner surface corresponding to the relatively lower portion within the hollow (S) of the resonance bar (131) to change its shape.

[0096] More specifically, as shown in (a) of FIG. 2, when the hollow (S) of the cylindrical resonance bar (131) is formed to be elongated in the vertical direction, the lower tuning point (133D) is protruded outwardly so as to be larger than the diameter of the resonance bar (131) relative to the center of the upper and lower ends of the hollow as a part close to the bottom surface of the cavity (C), but the outer shape is deformed to protrude annularly so that the frequency is adjusted to move upward as the outer diameter (tr) of the lower tuning point (133D) increases.

[0097] In addition, referring to (b) of FIG. 2 and (b) of FIG. 3, the resonator (130A) for tuning the first filter can be adjusted to shift the frequency downward by continuously applying annular pressure to the inner surface corresponding to the relatively upper portion within the hollow (S) of the resonant bar (131) to change its shape.

[0098] More specifically, as shown in (b) of FIG. 2, when the hollow (S) of the cylindrical resonance bar (131) is formed to be elongated in the vertical direction, the upper tuning point (133U) is protruded outward relatively closer to the upper end with respect to the center of the upper and lower ends of the hollow (S) of the resonance bar (131) as a part close to the filter tuning cover (120) provided to cover the upper part of the cavity (C) so as to be larger than the diameter of the resonance bar (131), but the outer shape is deformed to protrude annularly, so that the frequency can be adjusted to move downward as the outer diameter (tr) of the upper tuning point (133U) increases.

[0099] Meanwhile, in the first filter tuning resonator (130A) of the communication device filter (100) according to one embodiment of the present invention, the tuning points (133D, 133U) that substantially perform the frequency adjustment function are formed in a single layer on the resonance bar (131) as shown in FIG. 2, but the tuning points (133D, 133U) do not necessarily have to be formed in a single layer, and as referred to in FIG. 5 described below, a single resonance bar (131) may be provided in multiple layers, including a lower tuning point (133D) and an upper tuning point (133U).

[0100] FIG. 3a and FIG. 3b are graphs showing frequency characteristics according to upward and downward shifts in frequency through external deformation of the resonance bar (131) of the first filter tuning resonator (130A), and it can be seen that the frequency characteristics can be changed with performance similar to that of adjustment by a tuning screw (50).

[0101] Fig. 4 is a perspective view showing a second filter tuning resonator of a filter for a communication device of the present invention.

[0102] The first filter tuning resonator (130A) referred to in (a) and (b) of FIG. 2 is configured to substantially change the external shape of the resonant bar (131) so that it protrudes outwardly where the cavity (C) is provided by applying continuous annular pressure at the same height of the inner surface of the hollow (S) of the resonant bar (131) using a predetermined tuning device, but the lower tuning point (110D) and the upper tuning point (110U) for the shape change do not necessarily need to be formed continuously in an annular shape along the outer surface of the resonant bar (131).

[0103] That is, the second filter tuning resonator (130B) may be adjusted to shift the frequency upward by deforming the shape by applying pressure to a position spaced apart by a predetermined angle from the same height of the inner surface corresponding to the relatively lower portion within the hollow (S) of the resonant bar (131), as shown in (a) of FIG. 4, or may be adjusted to shift the frequency downward by deforming the shape by applying pressure to a position spaced apart by a predetermined angle from the same height of the inner surface corresponding to the relatively upper portion within the hollow (S) of the resonant bar (131), as shown in (b) of FIG. 4.

[0104] Fig. 5 is a cross-sectional view showing the installation structure of a third filter tuning resonator of a star type for a filter body, and Fig. 6 is a cross-sectional view showing an integrated first filter tuning resonator for a filter body.

[0105] In a filter (100) for a communication device according to one embodiment of the present invention, the third filter tuning resonator (130C) may be manufactured separately from the filter body (110) as shown in FIG. 5 and then installed so that its lower end is fixed through a frequency variable hole (not shown in the drawing) formed on the lower surface of the filter body (110). In addition, like the first filter tuning resonator (130A) shown in FIG. 6, it may be integrally formed with the filter body (10) by a deep drawing press process.

[0106] More specifically, in the third filter tuning resonator (130C), the resonance bar (131) may be installed so that its upper end is introduced toward the cavity (C) via a ring-shaped press-fit fixing ring (150) into a frequency variable hole formed on the lower surface of the filter body (110), as shown in FIG. 5. On the outer surface of the ring-shaped press-fit fixing ring (150), a plurality of fixing protrusions (155) may be formed spaced apart along the circumference so as to be press-fitted and fixed in a force-fit manner to the frequency variable hole.

[0107] In contrast, it is obvious that the first filter tuning resonator (130A) can be integrally formed to form a hollow space (S) in the lower surface of the filter body (110) through a deep-drawing press process, as shown in FIG. 6. The deep-drawing press process, which is a method of manufacturing the first filter tuning resonator (130A), provides the advantage of being able to rapidly mass-produce the filter tuning resonators (130A) of each of the multiple cavities (C) included in a single filter body (110).

[0108] At this time, the frequency adjustment of the first filter tuning resonator (130A) can be performed by creating an upper tuning point (133U) or a lower tuning point (133D) at an appropriate position during the design process, as described above, using a tuning device (not shown) inserted through the lower surface of the filter body (110) that is connected to the hollow (S).

[0109] FIG. 7 is a cross-sectional view showing a fourth filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention, and FIG. 8 is a cross-sectional view showing a fifth filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0110] In the filter (100) for a communication device according to the first embodiment of the present invention, in the fourth filter tuning resonator (130D), as referenced in (a) of FIG. 7, at least one shape-deforming slot (137D) that connects the hollow (S) and the cavity (C) can be formed spaced apart in the circumferential direction as a portion located inside the cavity (C).

[0111] Here, the frequency of the fourth filter tuning resonator (130D) can be adjusted by inserting a tuning device (not shown) into the hollow (S) and then applying pressure to the shape deformation slot (137D) from the hollow (S) side toward the cavity (C) in an outward direction to deform the shape. At this time, the direction of movement as the frequency adjustment direction can be determined depending on the relative position of the shape deformation slot (137D) in the hollow (S).

[0112] For example, as shown in (b) of FIG. 7, when the shape deformation slot (137D) is positioned relatively lower with respect to the center point of the cavity (C), a pressure block (170) can be movably provided in the hollow (S) of the resonance bar (131) that is connected through the frequency variable hole (115) of the installation boss (119) formed on the lower surface of the filter body (110), and as the shape deformation slot (137D) is deformed in the outer direction toward the cavity (C) according to the upward movement of the pressure block (170), the height of the upper end of the resonance bar (131) can be adjusted as a result.

[0113] In addition, as referenced in FIG. 8, the fifth filter tuning resonator (130E) is provided so that the shape can be deformed by a pressurized device (not shown) introduced through a tuning hole (125) formed in the filter tuning cover (120) when the shape deformation slot (137U) is formed in the upper part of the hollow (S), so that the height of the upper end (132) of the resonant bar (131) can be adjusted in the same way as the fourth filter tuning resonator (130D) described above. For reference, in the case of the fifth filter tuning resonator (130E), the pressurized device is introduced from the upper end of the resonant bar (131) into the hollow (S), and the upper end (132) of the resonant bar (131) can be formed to extend radially horizontally so as to have a larger diameter than the hollow (S) so as not to cause interference with the pressurized device.

[0114] FIG. 9 is a cutaway perspective view showing a sixth filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0115] The embodiments (130A to 130E) of the filter tuning resonator (130) described with reference to the above-described FIGS. 2 to 8 are all provided with a cylindrical resonance bar (131). Depending on the product, as shown in FIG. 9, the resonance bar (131) may be provided in the form of a metal panel rather than a cylindrical shape. In this case, the resonance bar (131) may be provided so as to be supported on the bottom side of the cavity (C) with respect to the filter body (110) via a pair of shape-deforming legs (138). Therefore, the frequency adjustment of the sixth filter tuning resonator (130F) may be performed by slightly changing the position of the upper end of the resonance bar (131) through a change in the external shape of the pair of shape-deforming legs (138).

[0116] Fig. 10 is a cross-sectional view showing a seventh filter tuning resonator of a filter for a communication device according to the first embodiment of the present invention.

[0117] In the filter (100) for communication device according to the first embodiment of the present invention, the seventh filter tuning resonator (130G) may include, as referenced in FIG. 10, a resonance bar (131) in which the upper part of the hollow (S) is opened to communicate with the cavity (C) and the lower part of the hollow (S) is opened to communicate with the outside of the filter body (110), and a frequency tuning block (139) that can move up and down in the hollow (S), but at least a part of which protrudes through the upper part of the hollow (S) toward the space of the upper cavity (C) to cause a change in appearance.

[0118] The upper part of the frequency tuning block (139) can be adjusted in such a way that its height is adjusted by partially protruding toward the open upper side of the resonance bar (131), thereby enabling adjustment according to upward and downward movement of the frequency. The upward movement of the frequency can be performed by moving the frequency tuning block (139) downward using a pusher (not shown) through a tuning hole (125) formed in the filter tuning cover (120), and the downward movement of the frequency can be performed by moving the frequency tuning block (139) upward using a pusher (not shown) through a frequency variable hole (115) formed at the lower part of the filter body (110).

[0119] Here, the seventh filter tuning resonator (130G) may further include a dielectric portion (180) interposed between the outer surface of the frequency tuning block (139) and the inner surface of the resonance bar (131) in which the hollow (S) is formed. In this way, the seventh filter tuning resonator (130G) provides the advantage of being able to manufacture a filter with higher reliability by blocking in advance the formation of fine metal powder (particles) due to friction between the resonance bar (131) made of a metal material and the frequency tuning block (139) through the additional provision of the dielectric portion (180).

[0120] In this way, the filter (100) for a communication device according to the first embodiment of the present invention does not need to have a tuning screw (50) as shown in FIG. 1 for separate frequency adjustment, so that the product can be manufactured in a miniaturized form, and provides the advantage of being able to easily perform a tuning process through downward and upward frequency adjustments through external deformation of the resonance bar (131) itself.

[0121] In addition, the filter (100) for a communication device according to the first embodiment of the present invention can completely prevent the phenomenon of incomplete contact between the tuning screw (50, see FIG. 1) and the filter tuning cover (20, see FIG. 1), which has been a problem in the past, and thus not only improves the PIMD problem that reduces the performance of the filter, but also provides the advantage of reducing the production (manufacturing) cost of the product because a separate tuning screw (50) or additional structure (e.g., a fixing nut (25) for fixing the tuning screw (50), see FIG. 1) is not required.

[0122] FIG. 11 is a perspective view showing a first filter tuning resonator of a filter for a communication device according to a second embodiment of the present invention, FIG. 12 is a cutaway perspective view taken along line AA of FIG. 11, and FIG. 13 is a cross-sectional view taken along line AA of FIG. 11.

[0123] A filter (200) for a communication device according to a second embodiment of the present invention, as shown in FIGS. 11 to 13, includes a filter body (210) having a cavity (C) formed therein as a predetermined space and having one side opened, and a filter tuning cover (220) provided to cover the opened side of the filter body (210). Here, it is assumed that the resonator (230) for filter tuning provided in the cavity (C) employs the same resonance bar (231) as the fourth filter tuning resonator (130D) of the filter (100) for communication device according to the first embodiment of the present invention described above.

[0124] More specifically, in the filter (200) for communication devices according to the second embodiment of the present invention, the resonator (230) for filter tuning may include a resonant bar (231) that is integrally formed from the lower surface of the drawing of the filter body (110) into the cavity (C) by a predetermined method (e.g., a deep drawing press method). However, the difference between the resonator (230) for filter tuning of the filter (200) for communication devices according to the second embodiment of the present invention and the fourth resonator (130D) for filter tuning of the filter (100) for communication devices according to the first embodiment of the present invention is that the upper surface of the resonant bar block (234) corresponding to the upper end of the resonant bar (231) is provided so as to be in contact with the lower surface of the filter tuning cover (220).

[0125] To explain this in more detail, in the filter (200) for a communication device according to the second embodiment of the present invention, the resonator (230) for filter tuning may include a resonance bar (231) formed integrally with the filter body (210) by a deep drawing press method on an installation boss (213) formed on the bottom surface of the cavity (C) of the filter body (210), as shown in FIGS. 12 and 13.

[0126] The installation boss (213) includes a frequency variable hole (215) having a predetermined inner diameter, and the resonance bar (231) may be integrally formed on the upper end of the installation boss (213), and may include at least one shape-deforming slot (237D) protruding toward the hollow (S) side with a smaller inner diameter than the frequency variable hole (215), and a resonance bar block (234) integrally formed on the upper end of the shape-deforming slot (237D) and having an upper surface in contact with the lower surface of the filter tuning cover (220).

[0127] Here, the upper surface of the resonance bar block (234) can be formed to extend to the same height as the upper surface of the filter body (210) at least to the extent of contacting the resonance disk panel (225) formed on the inner side of the filter tuning cover (220), which will be described later, when the filter tuning cover (220) is assumed to be fixedly attached to the upper surface of the filter body (210) in a bonding manner.

[0128] The filter tuning cover (220) may be provided with a dielectric layer of a ceramic material having a predetermined thickness. In addition, the outer surface of the filter tuning cover (220) with respect to the cavity (C) may be coated with a metal film, and the inner surface of the filter tuning cover (220) with respect to the cavity (C) may be provided with a metal film coated only at a portion that comes into contact with the upper surface of the resonance bar block (234) of the resonance bar (231).

[0129] For example, if the upper surface of the resonance bar block (234) corresponding to the upper part of the resonance bar (231) is formed into a circle with a predetermined diameter, the resonance disk panel (225) may be coated with the metal film in a circle larger than the diameter of the resonance bar block (234).

[0130] That is, the filter (200) for a communication device according to the second embodiment of the present invention is different in that, unlike a conventional filter cover that is provided with a metal material or a non-metal material and is coated with a metal film on the entire inner and outer surfaces in the case of a general cavity filter in which air is filled in the cavity (C), the filter (200) for a communication device is provided with a high permittivity ceramic dielectric material, and a resonance disk panel (40, see FIG. 1) that is directly coupled to an existing resonance bar (30, see FIG. 1) is formed on the inner surface (lower surface) of the filter tuning cover (220) and then joined by either a soldering method or a brazing welding method.

[0131] This filter tuning cover (220) can secure a high C value even by the thickness of the filter tuning cover (30) itself through a dielectric layer made of ceramic material, and thus provides the advantage of having a lower frequency value compared to the normal size.

[0132] FIG. 14 is a perspective view showing a filter for a communication device according to a second embodiment of the present invention, FIG. 15 is an exploded perspective view of FIG. 14, FIG. 16 is a cross-sectional view taken along line BB of FIG. 14, FIG. 17 is a cut-away perspective view taken along line CC of FIG. 14, FIG. 18 is a cut-away perspective view taken along line DD of FIG. 14, FIG. 19 is a cut-away perspective view taken along line CC of FIG. 14, in which a filter tuning cover is made transparent, FIG. 20 is a cut-away perspective view taken along line CC of FIG. 14, in which a resonant disk panel among the components of a filter for a communication device according to the second embodiment of the present invention is shown as an upward perspective view, and FIG. 21 is a projection perspective view of the components of FIG. 14 in which a filter tuning cover is made transparent.

[0133] According to the second embodiment of the present invention, a filter (200) for a communication device may have a plurality of cavities (C) formed inside a filter body (210), as shown in FIGS. 14 to 21. Here, the cavities (C) of the filter body (210) may be formed in a plurality of ways so as to be partitioned from adjacent cavities (C) by partition walls (219, 251a, 251b) integrally formed inside. In each of the plurality of cavities (C), a resonance bar (231) forming the above-described filter tuning resonator (230) may be simultaneously formed by a deep drawing press method.

[0134] The partition walls (219, 251a, 251b) may include a wall-shaped partition wall (251a) that partitions the resonance bars (231) related to the input port film portion (241) and the output port film portion (242) described later, respectively, a column-shaped partition wall (251b) arranged between adjacent resonance bars (231), and an open partition wall (219) having a window (not indicated in the drawing) formed at the upper end.

[0135] Here, the filter body (210) may have an inner surface and an outer surface including a plurality of resonant bars (231) and partition walls (219, 251a, 251b) entirely coated with a metal film.

[0136] Meanwhile, on one side and the other side of the upper portion of the filter body (210), a one-side press-fit protrusion (215a) and an other-side press-fit protrusion (215b) for press-fitting connection with the filter tuning cover (220) may be formed to protrude upwards from the upper portion of the filter body (210). In the filter tuning cover (220), a one-side press-fit hole (225a) and an other-side press-fit hole (225b), into which the one-side press-fit protrusion (215a) and the other-side press-fit protrusion (215b) described above are inserted in a press-fit manner, may be formed to penetrate in the vertical direction.

[0137] In addition, partition wall press-fitting protrusions (211a, 211b) extending upwards further than the upper end of the filter body (210) are formed integrally on the upper portions of the above-described wall-type partition wall (251a) and the column-type partition wall (251b) among the filter body (210), and partition wall press-fitting holes (221a, 221b) may be formed to penetrate in the vertical direction in the filter tuning cover (220) so that the above-described partition wall press-fitting protrusions (211a, 211b) are inserted in a press-fit manner.

[0138] Meanwhile, as referenced in FIGS. 15 to 18, a circular input port film portion (241) and an output port film portion (242) having a metal film and an electrically insulating structure are formed on the outer surface of the filter tuning cover (220), and the input port film portion (241) and the output port film portion (242) can be electrically soldered to the input terminal and the output terminal of an external PCB (not shown), respectively, so as to be electrically conductive.

[0139] According to the second embodiment of the present invention, a filter (200) for a communication device having a configuration as described above can output a filtered signal through an output port film portion (242) on the other side while implementing adjacent coupling and cross coupling, etc. through a resonance bar (231) provided in each cavity (C) when an electrical signal is input through an input port film portion (241) on one side.

[0140] Here, a coupling pattern portion (260) made of a conductive material for coupling between a plurality of resonance bars (131) can be integrally formed inside or on the upper part of the dielectric layer made of a ceramic material forming the filter tuning cover (220), as shown in FIGS. 16 and 17.

[0141] The coupling pattern section (260) is arranged in a form spaced apart from the adjacent resonant disk panels (225) inside a dielectric layer with a high dielectric constant made of ceramic material, thereby enabling the designer to implement a coupling of a desired form.

[0142] Meanwhile, as referenced in FIG. 20, a coupling variable block (213) formed integrally with the filter body (210) may be further formed between adjacent resonance bars (231) among a plurality of resonance bars (231).

[0143] The coupling variable block (213) can adjust the detailed coupling value by inserting a tool through the coupling variable hole (213h) formed on the lower surface of the filter body (210) to change its shape.

[0144] In addition, the lower surface of the filter body (210) may further include a resonance bar hole (214h) formed when manufacturing a resonance bar (231) formed to protrude toward the inside of the cavity (C) described above, for example, by a deep drawing press method.

[0145] Meanwhile, as shown in Fig. 21, a C-notch pattern portion (232) made of a conductive material that couples a plurality of resonance bars (131) to form a C-notch can be integrally formed inside or on the upper part of the dielectric layer made of the ceramic material forming the filter tuning cover (220).

[0146] Here, the resonant disk panel (225) is generally formed in a circular shape with a diameter larger than that of the resonant bar (231), but if a C-notch is required between the resonant bars (231) that are arranged somewhat apart from each other, a coupling extension (235a) that extends integrally from one side of the resonant disk panel (225) may be further formed.

[0147] Furthermore, in cases where a C-notch must be formed in a state where the resonance bars (231) are close to each other, the coupling desired by the designer can be implemented through the C-notch pattern portion (232) described above.

[0148] Here, in the filter (200) for a communication device according to the second embodiment of the present invention, the resonant disk panel (225), coupling pattern portion (260), C-notch pattern portion (232), and coupling extension portion (235a) provided in the filter tuning cover (220) can be simultaneously formed when the filter tuning cover (220) is manufactured using a LTCC (Low Temperature Co-fired Ceramic) method using a ceramic material.

[0149] Meanwhile, the filter tuning cover (220) does not necessarily have to be placed on the opened upper portion of the filter body (210), and in some embodiments, instead of the filter tuning cover (220), a PCB cover panel (320, see FIGS. 22 to 24 described below) provided in a PCB type may be directly connected to the filter body (210).

[0150] FIG. 22 is a bottom view (a) (c) and a cross-sectional view (b) of an implementation example in which a port connection pin is connected to a PCB cover panel among the configurations of a filter for a communication device according to a third embodiment of the present invention, and FIG. 23 is a bottom view (a) (c) and a cross-sectional view (b) of an implementation example in which a port extension part is connected to a side surface of a filter body among the configurations of a filter for a communication device according to a third embodiment of the present invention, and FIG. 24 is a cross-sectional view for explaining a frequency adjustment appearance of a filter for a communication device according to a third embodiment of the present invention.

[0151] A filter (200A) for a communication device according to a third embodiment of the present invention may include a filter body (210) and a PCB cover panel (320) provided to cover an opened side of the filter body (210) and provided in a PCB type, as shown in FIGS. 22 and 23. The PCB cover panel (320) may serve to replace the filter tuning covers (120, 220) of the filter (100) for a communication device according to the first embodiment of the present invention and the filter (200) for a communication device according to the second embodiment.

[0152] In particular, in the filter (200A) for communication devices according to the third embodiment of the present invention, a coupling pattern portion (370) corresponding to the coupling pattern portion (260) formed on the filter tuning cover (220) among the components of the filter (200) for communication devices according to the second embodiment of the present invention can be formed on the lower surface of the PCB cover panel (320) in the same manner as the printing method formed on one side and the other side of a typical PCB.

[0153] Here, the filter (200A) for a communication device according to the third embodiment of the present invention may further be formed with a connecting portion (400A, 400B) electrically connected to an external structure (not shown), as shown in FIGS. 22 and 23.

[0154] The connecting portion (400A, 400B) may be formed on the lower surface of the filter body (210) facing the PCB cover panel (320), as shown in FIG. 22, and may be formed on the side surface of the filter body (21), as shown in FIG. 23.

[0155] As shown in FIG. 22, when the connecting portion (400A) is formed on the bottom surface of the filter body (210), and the coupling pattern portion (370) formed on the PCB cover panel (320) adjusts the coupling value and simultaneously performs the role of the input port film portion (241) or the output port film portion (242) among the configurations of the filter (200) for a communication device according to the second embodiment of the present invention, the connecting portion (400A) may include a port pin (420A) that is electrically connected to and supported by the coupling pattern portion (370).

[0156] The port pin (420A) may be supported to penetrate a dielectric block (410A) coupled to an installation hole (not indicated in the drawing) provided to penetrate the filter body (210) at the lower end, and may be soldered to a coupling pattern portion (370) at the upper end. Here, the dielectric block (410A) may be provided in the form of a block made of either Teflon or polyetheretherketone (PEEK).

[0157] The coupling pattern portion (370) may be provided such that one end is formed in a semicircle and the other end is formed in a square shape, and the other end formed in a square shape may be provided such that the coupling value can be adjusted by the length that the other end extended toward the resonance disk panel (325) that the upper end of the resonance bar (231) of the filter tuning resonator (230) located within the same cavity (C) makes contact with. More specifically, the designer can design and manufacture the coupling pattern portion (370) so that a desired coupling value is obtained by adjusting the mutual gap (separation distance) and area between the resonance disk panel (325) and the coupling pattern portion (370).

[0158] Meanwhile, as referenced in FIG. 23, the connecting portion (400B) formed on the side surface of the filter body (210) may include a port extension portion (420B) formed integrally with the filter body (210) and folded to the side surface within the cavity (C), and a dielectric block (410B) that supports the end of the port extension portion (420B) against the side surface of the filter body (210).

[0159] The dielectric block (410B) here may also be provided in the form of a block made of either Teflon or polyetheretherketone (PEEK), as described above.

[0160] Meanwhile, the filter body (210) can be manufactured using the MIM (Metal Injection Mold) method so that the above-described connecting portions (400A, 400B) are integrally formed inside or in the installation hole. Manufacturing the filter body (210) using the MIM method can be formed integrally without applying an additional manufacturing process for the connecting portions (400A, 400B) along with the integral formation of the resonance bar (231), thereby improving the manufacturing process advantages.

[0161] A filter (200A) for a communication device according to a third embodiment of the present invention, as shown in FIG. 24, has a frequency tuning block (239) provided in the hollow space (S) of a resonant bar (231), and frequency adjustment is performed by moving the frequency tuning block (239) up and down in the hollow space (S) of the resonant bar (231).

[0162] More specifically, the frequency tuning block (239) may have screw threads (not shown) machined on the outer surface, and screw threads corresponding to the screw threads of the frequency tuning block (239) may be tapped on the inner surface forming the hollow (S) of the resonance bar (231). An adjustment groove (239h) may be formed at the lower end of the frequency tuning block (239), into which the end of a tuning tool (not shown) such as a driver is inserted through a frequency variable hole (215) formed on the lower surface of the filter body (210) and communicating with the hollow (S) of the resonance bar (231), and a contact prevention groove (321) may be formed in a chamfered shape on the PCB cover panel (320) to prevent contact and interference with the upper end of the frequency tuning block (239).

[0163] The filter (200A) for a communication device according to the third embodiment of the present invention having such a configuration can adjust the frequency upward or downward by changing the position of the frequency tuning block (239) in detail within the hollow (S) of the resonance bar (231).

[0164] According to the filter (200) for communication devices according to the second embodiment of the present invention and the filter (200A) for communication devices according to the third embodiment, which are configured as described above, a filter tuning cover (220) in the form of a ceramic wave guide filter is combined with a filter body (210) in the form of an existing air cavity filter, thereby providing the advantage of reducing loss and enabling miniaturization of the product.

[0165]

[0166] Hereinafter, the filter for a communication device according to embodiments of the present invention has been described in detail with reference to the attached drawings. However, the embodiments of the present invention are not limited to the above-described embodiments, and it will be understood that those skilled in the art can make various modifications and implement equivalent embodiments. Therefore, the true scope of the present invention should be defined by the claims set forth below.

Claims

1. A filter body including a cavity; and A filter for a communication device, comprising: a resonator for filter tuning, which is fixed to the bottom surface of the cavity, has a hollow space formed inside, and is equipped with a resonance bar made of a material capable of adjusting the frequency while causing an external change in shape within the cavity by an external force applied through the hollow space; 2. In claim 1, The material of the above resonant bar is a filter for communication devices, including a conductive material.

3. In claim 1, A filter for communication devices, wherein the above resonance bar is press-fitted and fixed into a frequency variable hole formed on the lower surface of the filter body via a circular press-fit fixing ring.

4. In claim 1, A filter for a communication device, wherein the above resonance bar is integrally formed with the filter body by a deep drawing press process.

5. In claim 1, The resonator for filter tuning is a filter for communication devices, which is adjusted to shift the frequency upward by continuously applying annular pressure to the inner surface corresponding to the relatively lower part within the hollow of the resonant bar to change its shape.

6. In claim 1, The resonator for filter tuning is a filter for communication devices, which is adjusted to shift the frequency downward by continuously applying annular pressure to the inner surface corresponding to the relatively upper part within the hollow of the resonant bar to change its shape.

7. In claim 1, The resonator for filter tuning is a filter for communication devices, which is adjusted to shift the frequency upward by applying pressure to a position spaced at a predetermined angle in the circumferential direction at the same height on the inner surface corresponding to the relatively lower part within the hollow of the resonant bar to change its shape.

8. In claim 1, The resonator for filter tuning is a filter for communication devices, which is adjusted to shift the frequency downward by applying pressure to a position spaced at a predetermined angle in the circumferential direction at the same height on the inner surface corresponding to the upper portion within the hollow of the resonant bar.

9. In claim 1, In the above resonance bar, at least one shape-deforming slot is formed spaced apart in the circumferential direction as a part located inside the cavity and connecting the hollow and the cavity, The resonator for the above filter tuning is a filter for a communication device that adjusts the frequency by deforming the shape by pressing the shape-deforming slot in an outward direction from the hollow.

10. In claim 9, A filter for a communication device, wherein the direction of movement of the frequency is determined according to the relative position of the shape-deforming slot in the hollow of the resonant bar.

11. In claim 9, The lower surface of the above filter body is provided with an installation boss having a frequency variable hole formed therein that communicates with the hollow of the above resonant bar, A filter for a communication device, wherein the above shape-deforming slot is shape-deformable by a pressurized block that can move through the frequency variable hole of the above installation boss.

12. In claim 11, A filter for a communication device, wherein the above shape-deforming slot is formed by protruding into the hollow of the resonant bar to be interfered with by the outer surface of the pressurized block.

13. In claim 9, Further comprising a filter tuning cover covering the open upper side of the filter body and having a tuning hole formed therein communicating with the cavity; A filter for a communication device, wherein the shape-deforming slot is deformable by a pressurizing device that can pressurize the hollow radial direction of the resonant bar after being introduced through the tuning hole of the filter tuning cover.

14. In claim 1, The above resonance bar is provided in the form of a metal panel connected by a pair of shape-deforming legs, A filter for a communication device, wherein the frequency is adjusted by changing the external shape of the pair of shape-deforming legs.

15. In claim 1, The resonator for tuning the filter has an upper hollow portion of the resonant bar that is opened to communicate with the cavity, and a lower hollow portion of the resonant bar that is opened to communicate with the outside of the filter body. A filter for a communication device, further comprising a frequency tuning block that is provided to be able to move up and down in the hollow portion of the resonant bar, and at least a portion of which protrudes toward the cavity through the upper portion of the hollow portion of the resonant bar to cause an external shape change.

16. In claim 15, A filter for a communication device, wherein the resonator for filter tuning further includes a dielectric member interposed between the outer surface of the frequency tuning block and the hollow inner surface of the resonant bar.

17. In claim 1, The above filter body is formed with one side open, Further comprising a filter tuning cover coupled to one open side of the filter body to cover the resonance bar; The above filter tuning cover is provided with a dielectric layer of ceramic material of a predetermined thickness, A filter for a communication device, wherein the outer surface of the filter tuning cover is coated with a metal film based on the cavity, and the inner surface of the filter tuning cover is coated with the metal film only in a portion that comes into contact with the upper surface of the resonance bar based on the cavity.

18. In claim 17, A filter for a communication device, wherein the metal film in contact with the upper surface of the resonant bar is a resonant disk panel coated to have a larger area than the upper surface of the resonant bar.

19. In claim 18, A filter for a communication device, wherein the resonant disk panel coated on the upper surface of the resonant bar and the filter tuning cover are joined by one of a soldering method and a brazing welding method.

20. In claim 17, The above cavities are formed in a plurality inside the filter body, and the resonance bars are provided in a plurality in each of the plurality of cavities. The above plurality of resonance bars are formed integrally with the filter body, A filter for a communication device, wherein the filter body has an inner surface and an outer surface including the plurality of resonant bars, and is entirely coated with a metal film.

21. In claim 20, A filter for a communication device, wherein a coupling variable bar formed integrally with the filter body is further formed between adjacent resonance bars among the plurality of resonance bars.

22. In claim 20, On the outer surface of the above filter tuning cover, a circular input port film portion and an output port film portion are formed that are electrically insulated from the metal film, A filter for a communication device, wherein the input port film portion and the output port film portion are electrically connected to the input terminal and the output terminal of an external PCB, respectively.

23. In claim 20, A filter for a communication device, wherein a coupling pattern portion made of a conductive material for coupling between the plurality of resonant bars is integrally formed inside the dielectric layer made of the ceramic material forming the filter tuning cover or in an upper portion of the dielectric layer.

24. In claim 20, A filter for a communication device, wherein a C-notch pattern portion made of a conductive material is integrally formed inside the dielectric layer of the ceramic material forming the filter tuning cover or on an upper portion of the dielectric layer to form a C-notch between the plurality of resonant bars.

25. In claim 1, The above filter body is formed with one side open, Further comprising a PCB cover panel coupled to one open side of the filter body to cover the resonance bar; A filter for a communication device, wherein a resonant disk panel is printed on the lower surface of the PCB cover panel to be in contact with the upper surface of the resonant bar and to have a larger area than the upper surface of the resonant bar, and a coupling pattern portion is printed to couple adjacent resonant bars.

26. In claim 25, The above filter body is further provided with a connecting portion that is electrically connected to the external configuration, A filter for a communication device, wherein the above connecting part is integrally formed with the above filter body.

27. In claim 25, Further comprising a frequency tuning block that is provided to be able to move up and down in the hollow of the above resonance bar; A filter for a communication device, wherein a screw thread is formed by machining on the outer surface of the frequency tuning block, and a screw thread that is combined with the screw thread of the frequency tuning block is formed by tapping on the inner surface forming the hollow of the resonance bar.

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