Filter for communication device

Abstract

According to various embodiments of the present invention, disclosed is a filter for a communication device, which comprises: a filter body having at least one cavity which is a predetermined space formed therein and having one side open; a filter tuning cover provided to cover the open side of the filter body and having a plurality of screw installation holes formed therein; a plurality of tuning screws fastened to the plurality of screw installation holes, respectively, and performing fine frequency adjustment by adjusting a separation distance from a front end of a resonator provided inside the cavity; and a screw holding member for temporarily fixing the plurality of tuning screws to the filter tuning cover, until the fine frequency tuning is performed, by means of deforming a part of the filter tuning cover using each of the plurality of tuning screws.

Description

Filters for communication devices

[0001] The present invention relates to a filter for communication devices, and more particularly, to a filter for communication devices capable of improving communication quality by minimizing the PIMD (Passive Intermodulation Distortion) phenomenon.

[0002] As mobile communication technology evolves, data transmission speeds are increasing exponentially, and the transmission power of base stations is gradually increasing to improve transmission and reception sensitivity in response to the increase in data transmission.

[0003] In these base stations, the transmission / reception filters and duplexers, which are essential equipment for preventing interference between transmission and reception ends, are mainly implemented using coaxial resonators made of metal with high power resistance characteristics to withstand high power.

[0004] In addition, since the filter used in the mobile communication base station requires accurate and uniform frequency characteristics, the characteristics change very sensitively depending on the mechanical tolerance that occurs during the manufacturing and assembly of each component, and therefore, the filter characteristics required for the filter can be implemented by adjusting the resonant frequency using a metal tuning screw (hereinafter referred to as “tuning screw”) on the upper cover of the housing that constitutes the coaxial resonator.

[0005] Meanwhile, in the passive filter, intermodulation distortion signals may occur due to nonlinear characteristics caused by imperfect metallic contact, metal debris, dirt, etc., and this is called PIMD (Passive Intermodulation Distortion).

[0006] Fig. 1 is an exploded perspective view showing a typical passive element filter, and Fig. 2 is a cross-sectional view showing a tuning structure using a tuning screw among the components of Fig. 1.

[0007] As shown in FIGS. 1 and 2, a conventional passive element filter (1) comprises a housing (2) forming a cavity (C) therein, at least one resonator (3) provided in the cavity (C), a filter tuning cover (5) coupled to the open upper side of the housing (2), a tuning screw (7) installed by penetrating a screw installation hole (6) formed in the filter tuning cover (5), and a nut (8) for locking the tuning screw (7) in a position where frequency adjustment is completed.

[0008] Recently, in addition to utilizing capacitance according to the separation distance (D) between the resonator (3) and the tuning screw (7), there is a trend to utilize capacitance utilizing the separation space between the inner circumference of the screw installation hole (6) formed in the filter tuning cover (5) and the outer circumference of the tuning screw (7) for application to a higher frequency band (hundreds of MHz).

[0009] However, the frequency tuning structure illustrated in FIGS. 1 and 2 is a screw assembly method in which the threads formed on the outer surface of the tuning screw (7) are directly frictionally connected to the screw installation hole (6), so that discontinuous contact occurs, and plating powder (fine metal powder) may be generated due to friction between the tuning screw (7) and the screw installation hole (6) during the frequency tuning process, and this fine metal powder is the main cause of PIMD occurrence.

[0010] In particular, since filters for communication devices typically use up to several dozen tuning screws (7) to adjust frequency characteristics, it is difficult to fundamentally eliminate the above PIMD problems or guarantee the same characteristics for each product, and products that are difficult to make into quality products even through repair or rework have to be discarded.

[0011] Additionally, since verification of PIMD performance is only possible after all performances of the product have been verified, there is a problem in that it takes more time and costs more than repairing a general substandard product.

[0012]

[0013] 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 capable of minimizing the occurrence of PIMD.

[0014] In addition, another object of the present invention is to provide a filter for a communication device having a solder paste application slot (solder slot) formed therein, which allows a tuning screw, on which frequency tuning (adjustment) has been completed, to be easily fixed to a filter tuning cover using a soldering method.

[0015] In addition, another object of the present invention is to provide a filter for a communication device in which the soldering work for a tuning screw to a screw installation hole using a solder material is very simple.

[0016] 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.

[0017]

[0018] According to one embodiment of the present invention, a filter for a communication device includes a filter body having at least one cavity, which is a predetermined space therein, and one side of which is open, a filter tuning cover provided to cover the opened one side of the filter body and having a plurality of screw installation holes formed therein, a plurality of tuning screws each fastened to the plurality of screw installation holes and configured to perform fine frequency tuning by adjusting a distance between the filter body and a tip of a resonator provided inside the cavity, and a screw holding member temporarily fixing the plurality of tuning screws to the filter tuning cover until the fine frequency tuning is performed by deforming the shape of a portion of the filter tuning cover using each of the plurality of tuning screws.

[0019] Here, the screw holding member may include a guide nut that mediates temporary fixation of the tuning screw to the screw installation hole of the filter tuning cover.

[0020] In addition, at least one solder paste application slot (hereinafter, abbreviated as “solder slot”) may be formed in one of the plurality of tuning screws and the guide nuts, into which a solder material is inserted for soldering the plurality of tuning screws to the screw installation holes after frequency tuning by each of the plurality of tuning screws.

[0021] Additionally, the solder slot may be formed in the guide nut so that at least a portion of the female thread of the nut, to which the male thread formed on the outer surface of the tuning screw is fastened, is removed.

[0022] Additionally, the solder slot may be formed in the guide nut such that a portion of the end that contacts the filter tuning cover is removed in the radial direction.

[0023] In addition, the screw installation hole includes an installation boss formed to protrude a predetermined length in the outer direction of the filter tuning cover, and a boss female thread may be formed on the inner surface of the installation boss to which a male thread formed on the outer surface of the tuning screw is fastened.

[0024] In addition, the boss female screw of the above-mentioned installation boss can be manufactured using the burring tap method of the above-mentioned filter tuning cover.

[0025] In addition, the guide nut includes a boss receiving portion provided in a form that surrounds the installation boss of the screw installation hole and a screw fastening portion having a nut female thread formed on the inner surface to which the male thread of the tuning screw is fastened, and the solder slot can be formed so that the nut female thread of the screw fastening portion is removed in the fastening direction of the tuning screw.

[0026] In addition, the guide nut includes a boss receiving portion that is provided in a form that surrounds the installation boss of the screw installation hole, and a screw fastening portion having a nut female thread formed on the inner surface to which the male thread of the tuning screw is fastened, and the solder slot may be formed by cutting a portion of the guide nut including the boss receiving portion and the screw fastening portion from the outer end to the inner side so that the tuning screw is exposed.

[0027] In addition, the outer surface of the installation boss may include an inner tapered portion whose diameter gradually decreases toward the outer end, and the inner surface of the boss receiving portion of the guide nut may include an outer tapered portion formed to have an inclination angle corresponding to the inner tapered portion of the installation boss.

[0028] In addition, the screw installation hole includes an installation boss formed to protrude a predetermined length in the outer direction of the filter tuning cover, and the guide nut includes a boss receiving portion provided in a form that surrounds the installation boss of the screw installation hole, and an upper tuning groove portion or a lower tuning groove portion may be formed by cutting the outer surface or inner surface of the filter tuning cover corresponding to the end of the boss receiving portion of the guide nut so as to be smaller than the thickness of the filter tuning cover.

[0029] Additionally, the solder slot may be formed in the tuning screw such that at least a portion of the male screw thread formed on the outer surface of the tuning screw is removed.

[0030] Additionally, the solder slot can be formed straight in the fastening direction with respect to the screw installation hole.

[0031] In addition, the solder slot may be formed in the tuning screw, and may be cut from the upper center of the tuning screw to the lower side by a predetermined length and may be cut so as to be connected to the screw installation hole.

[0032] Additionally, at least one of the upper and lower portions of the guide nut may have an additional space step formed so that a portion including the solder slot is cut out stepwise.

[0033] In addition, the fine frequency adjustment can be made according to the rotation direction of the guide nut after soldering and fixing the tuning screw and the filter tuning cover through the solder slot.

[0034] In addition, an upper tuning groove portion may be further formed on the outer surface of the filter tuning cover so that the maximum radius is smaller than the distance from the center of the screw installation hole to the outer surface of the guide nut, and a step portion may be additionally formed on the upper tuning groove portion so that the depth of the upper tuning groove portion is smaller than the depth of the upper tuning groove portion on the periphery of the screw installation hole.

[0035] In addition, when the material of the filter body and the filter tuning cover is aluminum (or alloy aluminum), the material of the guide nut may be made of a material having a higher high-frequency response than the filter body and the filter tuning cover, which are made of aluminum (or alloy aluminum).

[0036] In addition, the screw installation hole includes an installation boss formed so that the inner edge end protrudes into the cavity in a burring tab manner, and a boss female thread may be formed on the inner surface of the installation boss to which a male thread formed on the outer surface of the tuning screw is fastened.

[0037] Additionally, a solder mounting portion for mounting the solder material may be formed on the inside of the boss receiving portion of the guide nut.

[0038] Additionally, the solder mounting portion may be formed to have a cross-section that is slanted downward in the radial direction toward the outer surface of the tuning screw.

[0039] Additionally, the solder mounting portion may be formed to have a groove shape into which a solder ring formed to have a circular cross-section is fitted.

[0040] In addition, the screw holding member may include a guide elastic body having one end supported on the outer surface of the filter tuning cover and the other end spirally coupled to a male screw thread formed on the outer surface of at least the plurality of tuning screws.

[0041] Additionally, the guide elastic body may be a plate-shaped spring member having a predetermined thickness.

[0042] In addition, the other end of the plate-shaped spring member that is helically connected to the male screw threads of the plurality of tuning screws may be formed with a thickness smaller than the helical pitch of the male screw threads of the plurality of tuning screws.

[0043] Additionally, the plate-shaped spring member may be made of either a plastic plate or a metal plate.

[0044] Additionally, the guide elastic body may be a spring member whose diameter gradually decreases from one end to the other end.

[0045] In addition, the other end of the spring member that is helically connected to the male screw threads of the plurality of tuning screws may be formed to have a circular cross-section with a diameter smaller than the helical pitch of the male screw threads of the plurality of tuning screws.

[0046] Additionally, a solder material for soldering the plurality of tuning screws to the screw installation holes of the filter tuning cover can be inserted and applied through a space between each end of the plate-shaped spring member and the other end of the water spring member.

[0047] In addition, the screw holding member may include a unit clip that is coupled with a portion of the tuning screw that is spirally coupled to the screw installation hole of the filter tuning cover and is exposed to the outside of the filter tuning cover to temporarily fix the tuning screw.

[0048] In addition, the unit clip may include a support panel portion having a through-hole formed therein for passing through the tuning screw, which is supported on the outer surface of the filter tuning cover and is exposed to the outer surface of the filter tuning cover, and an elastic panel portion having a U-shaped elastic bend relative to the support panel portion, and a spiral coupling boss formed therein for spirally coupling with a portion of the outer surface of the tuning screw that passes through the support panel portion.

[0049] Additionally, a solder material may be inserted and applied between the support panel portion and the elastic panel portion to solder the plurality of tuning screws to the screw installation holes of the filter tuning cover through the penetration portion of the support panel portion.

[0050] According to another embodiment of the present invention, a filter for a communication device includes a filter body having at least one cavity, which is a predetermined space therein, and having one side open, a filter tuning cover provided to cover the opened one side of the filter body and having a plurality of screw installation holes formed therein, a plurality of tuning screws each fastened to the plurality of screw installation holes, and a screw holding member disposed on the outside of the filter tuning cover, which forms a moving space for the plurality of tuning screws that are moved by an external force transmitted through the plurality of tuning screws fixed to the filter tuning cover between the filter tuning cover and the filter tuning cover.

[0051]

[0052] According to the filter for a communication device according to embodiments of the present invention, the following various effects can be achieved.

[0053] First, by completely filling the gap between the screw installation hole and the tuning screw through soldering, it is possible to fundamentally block the occurrence of PIMD by fundamentally blocking incomplete contact between the tuning screw and the screw installation hole of the filter tuning cover.

[0054] Second, since the tuning screw does not loosen by soldering using a solder material through a solder slot formed integrally with the guide nut or tuning screw, there is no need for strong torque locking, so the filter tuning cover can be manufactured using a thin material, which reduces the weight of the product and has the effect of reducing manufacturing costs.

[0055] Third, since the tuning screw is fixed by soldering, there is no need to apply a separate epoxy or other material for fixing the screw, which has the effect of reducing the manufacturing cost of the product.

[0056] Fourth, since the guide nut is made of a metal that does not solder well, such as SUS (stainless steel), or a heat-resistant plastic, it has the effect of being reusable after soldering, as it can be disassembled (separated) even after the tuning screw is soldered to the filter tuning cover.

[0057] Fifth, unlike the conventional technology in which additional frequency readjustment is not possible when the tuning screw is fixed to the filter tuning cover by soldering after frequency tuning, the present invention has the effect of enabling additional frequency readjustment of the filter even when the frequency characteristics change after the tuning screw is fixed to the filter tuning cover by soldering or during the manufacturing process.

[0058]

[0059] Figure 1 is an exploded perspective view showing a typical passive element filter.

[0060] Fig. 2 is a cross-sectional view showing a tuning structure by a tuning screw among the configurations of Fig. 1.

[0061] FIG. 3 is a cross-sectional view of a filter for a communication device according to one embodiment of the present invention, in which a guide nut is applied among screw holding members.

[0062] Fig. 4a is an enlarged view showing a portion of the installation of the tuning screw in the configuration of Fig. 3.

[0063] Figure 4b is an exploded perspective view of Figure 4a,

[0064] Fig. 5 is a cross-sectional view (a), a plan view (b), and a bottom view (c) showing first to third implementation examples of solder slots formed in a guide nut among the configurations of Fig. 3.

[0065] Fig. 6 is a cross-sectional view (a) and a plan view (b) showing the solder appearance through the solder slot according to the third implementation example of the configuration of Fig. 5.

[0066] Fig. 7 is a cross-sectional view (a), a plan view (b) and a cross-sectional view (a), a plan view (b) and a side view (c) of a tuning screw according to a fourth implementation example formed in a tuning screw among the configurations of Fig. 3.

[0067] Fig. 8 is a plan view and a cross-sectional view (a) showing a solder slot formed in a tuning screw according to a fifth implementation example of the configuration of Fig. 3, and a plan view, cross-sectional view, and side view (b) of the tuning screw.

[0068] Fig. 9 is a plan view and a cross-sectional view showing a solder slot according to the sixth implementation example formed in the filter tuning cover among the configurations of Fig. 3.

[0069] FIG. 10 is a cross-sectional view (a) and a plan view (b) showing a filter for a communication device according to another embodiment of the present invention, and a cross-sectional view (a) and a plan view (b) and a bottom view (c) of some components (guide nut).

[0070] FIG. 11 is a cross-sectional view showing a locking process using a guide nut of a filter for a communication device according to another embodiment of the present invention.

[0071] Fig. 12 is a cross-sectional view showing the fine frequency adjustment (tuning) after fixing the tuning screw of the filter for a communication device according to one embodiment of the present invention.

[0072] Fig. 13 is a cross-sectional view and a plan view showing various embodiments of the home portion of the filter tuning cover in the configuration of Fig. 3.

[0073] Figure 14 is a cross-sectional view and a plan view showing a modified example of the groove of the filter tuning cover when a guide nut without a separate boss receiving portion is applied.

[0074] Fig. 15 is a plan view and a cross-sectional view showing another example of the installation boss in the configuration of Fig. 3.

[0075] FIG. 16a and FIG. 16b are cross-sectional views (a), plan views (b), and side views (c) showing various implementation examples of guide elastic bodies among screw holding members as another embodiment of the present invention.

[0076] Fig. 17 is a perspective view showing a unit clip among screw holding members as another embodiment of the present invention.

[0077] Figures 18a and 18b are modified examples of the guide nut of Figure 3, which are modified examples of temporarily fixing solder material without a solder slot.

[0078] Figure 19 is a cross-sectional view showing the fine frequency adjustment after soldering the tuning screw with the guide nut.

[0079]

[0080] <Explanation of symbols>

[0081] C: Cavity 10: Filter housing

[0082] 20: Filter body 30: Filter tuning cover

[0083] 31: Tuning screw 31-1: Male thread

[0084] 32: Guide nut 32-1: Nut female thread

[0085] 32a: Boss receiving section 32a-2: Outer taper section

[0086] 32b: Screw fastening part 35: Screw installation hole

[0087] 35a: Installation Boss 35-1: Boss Female Thread

[0088] 35-2: Inner taper 37a: Upper tuning groove

[0089] 37b: Lower tuning groove 40: Resonator

[0090] 41: Resonant body 42: Resonator disk panel

[0091] 50: Solder slot 51a~51f: Solder slot

[0092] 55,55a,55b: Solder paste

[0093] 132,232: Guide elastic body 332: Unit clip

[0094]

[0095] Hereinafter, a filter for a communication device according to embodiments of the present invention will be described in detail with reference to the attached drawings.

[0096] 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.

[0097] 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.

[0098]

[0099] FIG. 3 is a cross-sectional view of a filter for a communication device according to one embodiment of the present invention, in which a guide nut is applied among screw holding members, FIG. 4a is a partially enlarged view showing the installation of a tuning screw among the configurations of FIG. 3, and FIG. 4b is an exploded perspective view of FIG. 4a.

[0100] The filter (1) for a communication device according to the present invention is related to a technical feature that can minimize the occurrence of PIMD by minimizing the occurrence of fine metal powder (particles) generated in the process of adjusting (tuning) the frequency using a tuning screw (31) described later, and can be implemented in various embodiments and implementation examples as follows.

[0101] First, referring to FIGS. 3 to 4b, a filter (1) for a communication device according to the present invention may include a filter housing (10) that forms at least one cavity (C, Cavity), which is a predetermined space, therein.

[0102] The filter housing (10) may include a filter body (20) formed in a form in which the upper part is roughly open as shown in the drawing, but one side of the cavity (C) is open, and a filter tuning cover (30) formed with a plurality of screw installation holes (35) in which a plurality of tuning screws (31) described later are installed, which are combined to shield the opened side of the filter body (20).

[0103] Since one tuning screw (31) is usually provided to perform frequency tuning for each resonator (40) described later within the cavity (C), it is preferable that the number of tuning screws (31) and the number of resonators (40) be designed to be the same.

[0104] Here, the outer surface of the filter housing (10) and the inner surface of the filter body (20) and the filter tuning cover (30) forming the cavity (C) may be provided in a form in which a film made of a predetermined metal material is plated.

[0105] At this time, the metal material that becomes the film may be aluminum (or alloy aluminum), and in cases where the film is not formed, it is also preferable that the material of the filter body (20) and the filter tuning cover (30) be aluminum (or alloy aluminum).

[0106] Meanwhile, the filter (1) for a communication device according to the present invention may further include a plurality of resonators (40) that are fixed to the bottom surface of a cavity (C) formed by a filter body (20) of a filter housing (10) and are provided so that their tips extend toward the open side of the cavity (C).

[0107] Each of the plurality of resonators (40) may include a resonant body (41) and a resonator disk panel (42) in the form of a panel having a diameter larger than the diameter of the resonant body (41), and manufactured integrally or separately and joined to a tip adjacent to the filter tuning cover (30).

[0108] Here, the filter (1) for a communication device according to the present invention further includes a plurality of tuning screws (31) that are provided to be movable in the up-and-down direction at least within the cavity (C) so that the lower part of the drawing is positioned apart from the upper surface of the resonator disk panel (42), as shown in FIGS. 3 to 4b.

[0109] A plurality of tuning screws (31) are made of a conductive metal material, and can generate a resonance frequency characteristic desired by the designer by adjusting the distance between them and the upper surface of the resonator disk panel (42) within the cavity (C) (see drawing symbol “D” in FIG. 2).

[0110] Meanwhile, a plurality of tuning screws (31) are installed in a screw assembly manner for each of a plurality of screw installation holes (35), and the height of the lower part of the drawing can be adjusted so that the resonance frequency characteristic value within the cavity (C) is adjusted according to the one-way rotation and the other-way rotation of the tuning screws (31).

[0111] In particular, the tuning screw (31) can be directly screw-assembled into the screw installation hole (35), but as shown in FIGS. 3 to 4b, it can be installed into the screw installation hole (35) of the filter tuning cover (30) via a screw holding member (see 32 and the drawing reference numerals '132', '232' and '332' of FIG. 16a and below described below).

[0112] Here, the screw holding member (32, 132, 232, 332) prevents the original adjusted resonance frequency characteristic value from being changed due to a change in the distance between the lower end of the tuning screw (31) and the resonator disk panel (42) due to factors such as play (shaking) after the tuning screw (31) has been adjusted to the resonance frequency characteristic value desired by the designer.

[0113] A screw holding member (32, 132, 232, 332) performing such a function may include a guide nut (32) that mediates temporary fixation of a tuning screw (31) to a screw installation hole (35) of a filter tuning cover (30), as referenced in FIGS. 3 to 4b.

[0114] However, the screw holding member (32, 132, 232, 332) is not limited to the configuration of the guide nut (32) as described above, and may be implemented as either a guide elastic body (132, 232) which is supported on the outer surface of the filter tuning cover (30) at one end and is spirally coupled to the male screw thread (31-1) formed on the outer surface of at least a plurality of tuning screws (31) at the other end, as referred to in FIG. 16a and FIG. 16b described later, or a unit clip (332) which is spirally coupled to the screw installation hole (35) of the filter tuning cover (30) and is coupled to the portion exposed to the outside of the filter tuning cover (30) to temporarily fix the tuning screw (31), as referred to in FIG. 17.

[0115] Below, the main shapes and functions of the guide elastic body (132) and the unit clip (332) among the screw holding members (32, 132, 232, 332) will be described in more detail later, and the guide nut (32) will be described as a representative configuration.

[0116] Here, the filter (1) for a communication device according to the present invention may be formed on one of a plurality of tuning screws (31) and a guide nut (32), and a solder paste application slot (hereinafter, abbreviated as 'solder slot') into which a solder material (solder paste) is inserted for soldering the plurality of tuning screws (31) to the screw installation hole (35) after frequency tuning by each of the plurality of tuning screws (31) may be formed.

[0117] The solder slot (50) serves to provide a portion where solder paste, a type of soldering material, is applied, and also serves to fix the tuning screw (31) and the filter tuning cover (30) by soldering when the solder paste is exposed to high temperature and melts.

[0118] Such a solder slot (50) may be formed integrally with the guide nut (32) as described above, or may be formed integrally with the tuning screw (31). Hereinafter, the solder slot (50) formed in the guide nut (32) is defined as a nut-side solder slot (51a, 51b, 51c) according to the implementation example, and the solder slot (50) formed in the tuning screw (31) is defined as a screw-side solder slot (52).

[0119] FIG. 5 is a cross-sectional view (a), a plan view (b), and a bottom view (c) showing first to third implementation examples of a solder slot formed in a guide nut among the configurations of FIG. 3, FIG. 6 is a cross-sectional view (a) and a plan view (b) showing a solder appearance through a solder slot according to the third implementation example among the configurations of FIG. 5, FIG. 7 is a cross-sectional view (a), a plan view (b) showing a solder slot according to the fourth implementation example formed in a tuning screw among the configurations of FIG. 3, and a cross-sectional view (a), a plan view (b), and a side view (c) of the tuning screw, FIG. 8 is a plan view and a cross-sectional view (a) showing a solder slot according to the fifth implementation example formed in a tuning screw among the configurations of FIG. 3, and a plan view, a cross-sectional view, and a side view (b) of the tuning screw, and FIG. 9 is a plan view and a cross-sectional view showing a solder slot according to the sixth implementation example formed in a filter tuning cover among the configurations of FIG. 3.

[0120] First, let's look at the nut-side solder slots (51a to 51c) that are formed integrally with the guide nut (32), as follows.

[0121] The guide nut (32) is formed to have an outer surface of various horizontal cross sections, such as approximately hexagons or squares, as shown in FIGS. 5 and 6, and is formed to have a hollow portion extending vertically through the center portion, and a nut female thread (32-1) may be formed by processing the inner circumference corresponding to the hollow portion to be fastened to a male thread (31-1) formed on the outer circumference of the tuning screw (31).

[0122] Such a guide nut (32) can be manufactured from a metal or heat-resistant plastic material, and when manufactured from a metal material, it can be plated with nickel plating or chrome plating to prevent it from being soldered together when soldering the tuning screw (31) and the filter tuning cover (30) described later. This is to enable relative rotation of the guide nut (32) with respect to the tuning screw (31), thereby enabling fine frequency adjustment through shape change of the filter tuning cover (30), which is one of the special operating features of the present invention.

[0123] However, when the above-described tuning screw (31) is fixed by soldering using the solder slot (50) of the guide nut (32), the melting of the solder material (55) by a high-frequency heater (not shown) cannot be ruled out, so in this case, the material of the guide nut (32) can be selected as a metal having a high high-frequency response (for example, a metal that is vertically attached to a magnet of 500 G or less, such as carbon steel or STS430).

[0124] At this time, when the material of the solder material (55) is generally adopted as low-temperature solder having a low melting point, and the same low-temperature solder is adopted as the soldering material of the filter tuning cover (30) for the filter body (20), the high-frequency reactivity of the filter body (20) and the filter tuning cover (30) made of aluminum (or alloy aluminum) is relatively lower than that of the guide nut (32).

[0125] Accordingly, when the filter body (20) and the filter tuning cover (30) are heated to, for example, 100°C under the same frequency output, the solder material (low-temperature solder) (55) in the solder slot (50) to be soldered by means of the guide nut (32) having high high-frequency reactivity can be easily raised above the melting point, thereby preventing the solder material (low-temperature solder) for soldering the filter body (20) and the filter tuning cover (30) made of aluminum having relatively low high-frequency reactivity from being excessively melted, thereby preventing the problem of RF characteristics being deformed in advance.

[0126] For reference, since the tuning screw (31) and the filter tuning cover (30) must be fixed by soldering using a solder material (55), as described later, they must be formed of a material that is easy to fix by soldering, or must be pre-plated for soldering, unlike the guide nut (32).

[0127] Here, the nut-side solder slots (51a, 51b, 51c) may include a solder slot (51a) of the first embodiment formed in a groove shape so that a part of the nut female thread (32-1) formed in the hollow portion of the guide nut (32) is removed, as shown in (a) of FIG. 5, a solder slot (51b) of the second embodiment formed in a slit shape so that the outer surface of the guide nut (32) and the hollow portion are mutually connected, as shown in (b) of FIG. 5, and a solder slot (51c) of the third embodiment formed so that a part of the end that contacts the filter tuning cover (30) is radially removed, as shown in (c) of FIG. 5.

[0128] Meanwhile, the filter (100) for a communication device according to the present invention may further include a screw installation hole (35) formed in the filter tuning cover (30) for installation (or fastening) of the tuning screw (31) to the filter tuning cover (30), as referenced in FIGS. 3 to 6.

[0129] The screw installation hole (35) is formed in the shape of a circular hole that connects the outer space of the filter tuning cover (30) and the cavity (C), and a female thread (a boss female thread (35-1) described later) for fastening with a male thread (31-1) formed on the outer surface of the tuning screw (31) can be formed on the inner surface (the surface that forms the thickness).

[0130] Here, the screw installation hole (35) can be formed in a simple hole shape, or as shown in FIGS. 4a and 4b, it can be provided in a shape including an installation boss (35a) formed to protrude a predetermined length in the outer direction of the filter tuning cover (30) in the shape of a boss.

[0131] The boss female screw thread (35-1) described above is formed by processing on the inner surface of the installation boss (35a), and the boss female screw thread (35-1) can be manufactured (processed) using the burring tap method of the filter tuning cover (30).

[0132] When a screw installation hole (35) is formed in a filter tuning cover (30) by processing it using a burring tap method like this, it not only facilitates the manufacture of a boss female thread (35-1) for the inner circumference of the screw installation hole (35) of a filter tuning cover (30) manufactured with a somewhat thinner specification, but also provides the advantage of enabling the adoption of a filter tuning cover (30) with a reflectively thinner specification.

[0133] For reference, when adopting a filter tuning cover (30) with a specification having a thinner thickness, as described later, the range of shape change of the filter tuning cover (30) for later fine frequency adjustment after fixing the tuning screw (31) to the screw installation hole (35) increases, thus providing an advantage in readjustment within a wider frequency range.

[0134] Assuming that the screw installation hole (35) is provided in a boss shape as described above, the guide nut (32) may include a boss receiving portion (32a) provided in a shape that surrounds the installation boss (35a) of the screw installation hole (35), as in the first and second implementation examples of FIGS. 3 and 5, and a screw fastening portion (32b) having a nut female thread (32-1) formed on the inner surface to which the male thread (31-1) of the tuning screw (31) is fastened.

[0135] However, in the case where the configuration is for fixing the tuning screw (31) that is fastened to the screw installation hole (35) formed in a simple hole shape without the installation boss (35a) formed, as in the solder slot (51c) according to the third implementation example of FIG. 5, the boss receiving portion (32a) does not need to be provided separately.

[0136] Here, the solder slot (51a) of the first implementation example can be formed in a form in which the nut female thread (32-1) formed on the hollow inner surface of the screw fastening portion (32b) excluding the boss receiving portion (32a) is removed when the boss receiving portion (32a) of the screw installation hole (35) as referred to in FIGS. 3 to 4b is provided, as referred to in FIG. 5.

[0137] In addition, the solder slot (51b) of the second implementation example can be formed in a form in which the nut female thread (32-1) is removed to include a boss receiving portion (32a) of the screw installation hole (35) as referenced in FIGS. 3 to 4b, as referenced in FIG. 5.

[0138] At this time, the solder slot (51b) of the second implementation example has a difference in that it is formed in a slit shape so that the outer surface and the hollow of the guide nut (32) are mutually connected, as described above.

[0139] However, the solder slot (51c) of the third implementation example is formed with a nut female thread (32-1) without a boss receiving portion (32a) in the screw installation hole (35) of the filter tuning cover (30), and a part of the end of the guide nut (32) that comes into contact with the filter tuning cover (30) is formed so that it is removed in the radial direction, but a part of the guide nut (32) can be cut so that the tuning screw (31) is exposed from the outer end to the inner side.

[0140] When frequency adjustment is completed by fastening the tuning screw (31) to the screw installation hole (35), when solder material (solder paste) (55) is applied through the solder slots (51a to 51c) of the various implementation examples described above and then maintained in a high temperature atmosphere (or a predetermined high frequency atmosphere) for a predetermined time, the solder material (55) melts and the tuning screw (31) and the filter tuning cover (30) can be fixed to each other by soldering.

[0141] At this time, the solder material (55) applied through the solder slot (51a) of the first embodiment and the solder slot (51b) of the second embodiment, as shown in FIG. 4a, melts in a high-temperature atmosphere while being applied to the tip of the installation boss (35a) of the screw installation hole (35), and seeps into and fills the space between the boss female thread (35-1) formed on the inner surface of the installation boss (35a) and the male thread (31-1) of the tuning screw (31), thereby completely eliminating the generation of fine metal powder (particles), which is a chronic cause of the PIMD problem.

[0142] In addition, the solder material (55) applied through the solder slot (51c) of the third embodiment can be melted in a high-temperature atmosphere while being applied between the outer edge of the screw installation hole (35) and the tuning screw (31), as shown in FIG. 6, and can seep into and fill the space between the boss female thread (35-1) and the male thread (31-1) of the tuning screw (31).

[0143] The solder slots (51a to 51c) of various implementation examples described with reference to FIGS. 3 to 6 are implementation examples formed in the guide nut (32).

[0144] However, the solder slot (50) does not necessarily have to be formed only in the guide nut (32), and as shown in FIGS. 7 and 8, it may be formed in the tuning screw (31), and as shown in FIG. 9, it may be formed in the filter tuning cover (30).

[0145] More specifically, the solder slot (51d) of the fourth embodiment may be formed in the tuning screw (31) as referenced in FIG. 7, but may be formed such that at least a portion of the male screw thread (31-1) formed on the outer surface of the tuning screw (31) is removed.

[0146] A solder slot (51d) like this can be formed straight in the direction of fastening of the tuning screw (31) to the screw installation hole (35).

[0147] In addition, the solder slot (51e) according to the fifth implementation example may be formed in the tuning screw (31), as shown in FIG. 8, and may be cut from the upper center of the tuning screw (31) to the lower side by a predetermined length and may be cut so as to be connected to the screw installation hole (35).

[0148] Here, the solder slot (51e) according to the fifth embodiment may include a solder material inlet (51e-1) that is cut and removed by a predetermined length from the upper center of the tuning screw (31) to the lower side so as to have a circular horizontal cross-section or a polygonal horizontal cross-section, and a solder material guide hole (51e-2) that is orthogonally connected from the lower side of the solder material inlet (51e-1) to the screw installation hole (35).

[0149] In the fifth embodiment, when solder material (55) is injected into the solder material injection portion (51e-1) of another solder slot (51e), and when the solder material (55) is exposed to a high temperature atmosphere and melts, it moves to the female thread (32-1) side of the guide nut (32) through the solder material guide hole (51e-2), and then seeps into the female thread (35-1, boss female thread) side of the screw installation hole (35) below it and hardens, thereby being fixed by soldering.

[0150] At this time, since the guide nut (32) is plated with nickel plating or chrome plating, which is incompatible with the solder material (55), even if the solder material (55) comes into contact with the female thread (32-1) of the guide nut (32), the tuning screw (31) and the guide nut (32) are not mutually soldered and fixed, and fine frequency adjustment is possible according to the movement of the tuning screw (31) in accordance with the rotational direction of the guide nut (32). This will be described in more detail later.

[0151] Additionally, the solder slot (51f) of the sixth implementation example can be formed so that a portion of the outer surface of the filter tuning cover (30) is cut off, as shown in FIG. 9.

[0152] At this time, the cutting range of the solder slot (51f) of the sixth implementation example is such that a part of the surface that comes into contact with the filter tuning cover (30) of the guide nut (32) is cut, but at least the cutting is formed more radially than the outer surface of the guide nut (32), so that the insertion and application of the solder material (55) can be facilitated.

[0153] Here, although not shown in the drawing, the solder slot (51f) according to the sixth implementation example can be formed with its bottom surface inclined downward toward the tuning screw (31) side so that the molten solder material (55) can easily flow down in the direction of its own weight.

[0154] FIG. 10 is a cross-sectional view (a) and a plan view (b) showing a filter for a communication device according to another embodiment of the present invention, and a cross-sectional view (a), a plan view (b), and a bottom view (c) of some components (guide nut), and FIG. 11 is a cross-sectional view showing a locking process using a guide nut of a filter for a communication device according to another embodiment of the present invention.

[0155] A filter (1) for a communication device according to another embodiment of the present invention is a case where, as referenced in FIGS. 10 and 11, a screw installation hole (35) is formed to include an installation boss (35a), and a guide nut (32) is also provided with a boss receiving portion (32a) that surrounds the installation boss (35a).

[0156] Here, the outer surface of the installation boss (35a) may include an inner taper portion (35-2) whose diameter gradually decreases toward the outer end (i.e., in the direction away from the outer surface of the filter tuning cover (30)), and the inner surface of the boss receiving portion (32a) of the guide nut (32) may include an outer taper portion (32a-2) formed to have an inclination angle corresponding to the inner taper portion (35-2) of the installation boss (35a).

[0157] According to a filter (1) for a communication device according to another embodiment of the present invention, as shown in FIG. 11, when locking (or temporarily fixing) the tuning screw (31) to the installation boss (35a) using the guide nut (32) after frequency adjustment by the tuning screw (31), the stronger the locking force of the guide nut (32) is applied, the closer the outer taper portion (32a-2) of the guide nut is to the inner taper portion (35-2) of the installation boss (35a), thereby increasing the force pushing the installation boss (35a) toward the tuning screw (31), thereby reducing the gap between the outer surface of the tuning screw (31) and the inner surface of the installation boss (boss female thread (35-1)).

[0158] In this way, the filter (1) for a communication device according to the present invention can provide the additional advantage of reducing the weight of the product and also reducing the manufacturing cost by forming the screw installation hole (35) not as a simple hole but including an installation boss (35a), thereby allowing the filter tuning cover (30) to be manufactured with a relatively thin material.

[0159] FIG. 12 is a cross-sectional view showing a fine adjustment (tuning) state after fixing a tuning screw of a filter for a communication device according to one embodiment of the present invention, FIG. 13 is a cross-sectional view and a plan view showing various examples of a groove of a filter tuning cover in the configuration of FIG. 3, FIG. 14 is a cross-sectional view and a plan view showing a modified example of a groove of a filter tuning cover in the case where a guide nut without a separate boss receiving portion is applied, and FIG. 15 is a plan view and a cross-sectional view showing another example of the formation of an installation boss in the configuration of FIG. 3.

[0160] In general, it is preferable that a frequency-fixed filter, such as a filter (1) for a communication device according to one embodiment of the present invention, be fixed so as to prevent any physical random movement (movement) due to an external force (external force) after frequency adjustment according to the frequency characteristics within each cavity (C) by a tuning screw (31).

[0161] However, frequency adjustment is not limited to a one-time adjustment using a tuning screw (31), but additional frequency adjustment (hereinafter referred to as 'fine frequency adjustment') may be required depending on the location where the antenna device is installed, the position, and the details of the required frequency characteristics.

[0162] However, as referenced in Fig. 12, after frequency adjustment using the tuning screw (31), if the gap for the screw installation hole (35) of the filter tuning cover (30) is completely filled with the solder material (55), further rotation of the tuning screw (31) is impossible, so additional fine frequency adjustment may be difficult.

[0163] However, in the case of the filter (1) for a communication device according to one embodiment of the present invention, the filter tuning cover (30) can be manufactured from a material having a relatively thin thickness, so that even after the tuning screw (31) is fixed to the filter tuning cover (30), fine frequency adjustment according to the rotation direction of the tuning screw (31) is possible, as shown in FIG. 12.

[0164] More specifically, even after the tuning screw (31) is soldered and fixed to the screw installation hole (35) of the filter tuning cover (30) using a solder material (55), when the guide nut (32) is forcibly rotated to one side or the other, the tuning screw (31) does not actually rotate. However, by the rotational force provided by the user (designer), a force is applied to slightly pull up or push down the filter tuning cover (30) corresponding to the inner portion of the boss receiving portion (32a) of the guide nut (32), thereby moving the tuning screw (31) up and down. Considerable frequency tuning can be achieved within this fine movement range. The fine frequency adjustment process according to the fine movement of the filter tuning cover (30) will be described in more detail later.

[0165] Meanwhile, in the case where the filter tuning cover (30) is formed relatively thick, as shown in FIG. 13, an upper tuning groove (37a) may be formed on the upper surface corresponding to the screw installation hole (35) of the filter tuning cover (30) so as to accommodate a portion of the lower end of the boss receiving portion (32a), and a lower tuning groove (37b) may be formed on the lower surface of the filter tuning cover (30) corresponding to the lower end of the boss receiving portion (32a).

[0166] When such an upper tuning groove (37a) or lower tuning groove (37b) is additionally formed on the upper or lower surface of the filter tuning cover (30), fine frequency tuning can be achieved by the operation of slightly deforming the groove (37a or 37b) by the rotational force transmitted to the tuning screw (31).

[0167] The above-described upper tuning groove (37a) and lower tuning groove (37b) are configured based on the assumption that the guide nut (32) is provided with a separate boss receiving portion (32a).

[0168] In contrast, the upper tuning groove (37c) according to the modified example referenced in FIG. 14 is provided in a general form in which a separate boss receiving portion is not provided in the guide nut (32), and is formed around the screw installation hole (35) of the filter tuning cover (30), but can be formed so that its maximum radius is smaller than the distance from the center of the screw installation hole (35) to the outer surface of the guide nut (32).

[0169] In addition, in the upper tuning groove (37c) according to the modified example, a step (37c-1) may be additionally formed at the periphery of the screw installation hole (35) to be smaller than the depth of the upper tuning groove (37c) so as to secure a sufficient screw fastening range with the male screw thread (31-1) of the tuning screw (31).

[0170] In this way, when a step portion (37c-1) is additionally formed in the upper tuning groove portion (37c) according to the modified example, the screw fastening range of the tuning screw (31) is sufficiently secured, so that when the guide nut (32) is rotated to one side or the other after fixing by soldering by applying solder material through the solder slot (50), the tuning screw (31) is moved to be pulled up or pushed down, thereby achieving the advantage of stable additional fine frequency readjustment.

[0171] In more detail, referring to FIG. 14, when a solder material (55) is applied through a solder slot (50) of a guide nut (32) and then placed in a high temperature atmosphere (or a high frequency atmosphere) for a predetermined period of time, the solder material (55) melts and hardens by seeping into the gap between the male thread (31-1) formed on the outer surface of the tuning screw (31) and the boss female thread (35-1) of the screw installation hole (35) in a soldering manner, thereby fixing the tuning screw (31) to the filter tuning cover (30).

[0172] Next, when the designer rotates the guide nut (32) in place in one direction or the other direction to readjust the frequency characteristics, a portion of the lower surface of the guide nut (32) that is formed to be relatively thinner than the thickness of the filter tuning cover (30) while supporting the outer surface of the filter tuning cover (30) or a portion corresponding to the upper tuning groove (37c) according to a variation of the lower surface of the guide nut (32) is deformed so that it is pulled upwards in the drawing or pushed downwards (toward the cavity (C)) in the drawing depending on the rotational direction of the tuning screw (31).

[0173] Here, when the shape deformation of the upper tuning groove (37c) according to the modified example is upward, the frequency readjustment is performed while the distance between the lower end of the tuning screw (31) and the upper end of the resonator (40) in the cavity (C) is slightly increased, and conversely, when the shape deformation of the upper tuning groove (37c) according to the modified example is downward, the frequency readjustment can be performed while the distance between the lower end of the tuning screw (31) and the upper end of the resonator (40) in the cavity (C) is slightly decreased.

[0174] Meanwhile, in the filter (1) for a communication device according to one embodiment of the present invention, as referenced in FIG. 13, an additional space step portion (32c-1, 32c-2) may be further formed on at least one of the upper and lower portions of the guide nut (32) so that a portion including the solder slot (50) is cut out stepwise.

[0175] The additional space step portion (32c-1, 32c-2) serves to secure additional space so that a sufficient amount of solder material (55) can be filled when applying solder material through the solder slot (50).

[0176] However, it is not necessary for the additional space step portion (32c-1, 32c-2) to be formed by cutting in a stepwise manner, and it is natural that it can be formed in a tapered manner as long as sufficient space can be secured.

[0177] In addition, the filter (1) for a communication device according to one embodiment of the present invention is described as having an installation boss (35a) formed to protrude outward from the outer surface of the filter tuning cover (30), as shown in FIG. 3, but the direction in which the installation boss (35a) is formed is not necessarily limited to this.

[0178] For example, the installation boss (35a) can be formed so that the inner edge of the screw installation hole (35) of the filter tuning cover (30) protrudes into the cavity (C) in a burring tab manner, as in another forming example referenced in FIG. 15.

[0179] Here, a boss female thread (35-1) can be formed on the inner surface of the installation boss (35a) to which a male thread (31-1) formed on the outer surface of the tuning screw (31) is fastened.

[0180] The installation boss (35a) according to another forming example like this also compensates for the disadvantage of the filter tuning cover (30) being formed to be somewhat thin, thereby facilitating the formation of the boss female thread (35-1) inside the screw installation hole (35), and providing the advantage of being able to significantly reduce the weight of the entire product by enabling the use of a thinner filter tuning cover (30).

[0181] FIG. 16a and FIG. 16b are cross-sectional views (a), plan views (b), and side views (c) showing various implementation examples of guide elastic bodies among screw holding members as another embodiment of the present invention, and FIG. 17 is a perspective view showing a unit clip among screw holding members as another embodiment of the present invention.

[0182] In the filter (1) for a communication device according to the present invention, the screw holding member (32, 132, 232, 332) may include a guide elastic body (132, 232) whose one end is supported on the outer surface of the filter tuning cover (30) and whose other end is helically connected to a male screw thread (31-1) formed on the outer surface of at least a plurality of tuning screws (31).

[0183] Here, the guide elastic body (132, 232) may be a plate-shaped spring member (132) having a predetermined thickness, as referenced in FIG. 16a.

[0184] One end (132B) of the plate-shaped spring member (132) that is in close contact with the outer surface of the filter tuning cover (30) may be formed in a circular shape as shown in FIG. 16A, and although not shown in the drawing, may have a pammed nut shape having the outer shape of a nut.

[0185] At this time, the other end (132A) that is helically connected to the male screw threads (31-1) of the plurality of tuning screws (31) among the plate-shaped spring members (132) can be formed with a thickness (T1) smaller than the helical pitch (P) of the male screw threads (31-1) of the plurality of tuning screws (31) to facilitate the helical connection.

[0186] A plate-shaped spring member (132) like this can be made of either a plastic plate or a metal plate.

[0187] Meanwhile, the guide elastic body (132, 232) may be a spring member (232) whose diameter gradually decreases from one end (232B) to the other end (232A), as shown in FIG. 16b.

[0188] Here too, as referenced in Fig. 16b, the other end (232A) of the spring member (232) that is helically connected to the male screw threads (31-1) of the plurality of tuning screws (31) can be formed to have a circular cross-section with a diameter (T2) smaller than the helical pitch (P) of the plurality of tuning screws (31).

[0189] A solder material (55) for soldering a plurality of tuning screws (31) to the screw installation holes (35) of the filter tuning cover (30) can be inserted and applied through the space between each end (132B, 232B) and the other end (132A, 232A) of the plate-shaped spring member (132) and the water spring member (232).

[0190] Meanwhile, the screw holding member (32, 132, 232, 332) may include a U-nut clip (332) that is coupled with a portion exposed to the outside of the filter tuning cover (30) among the tuning screws (31) that are spirally coupled to the screw installation hole (35) of the filter tuning cover (30) to temporarily fix the tuning screw (31), as shown in FIG. 17.

[0191] Here, the unit clip (332) may include a support panel portion (332A) that is supported on the outer surface of the filter tuning cover (30) as shown in FIG. 17 and has a penetration portion (not shown) formed therein for passing through the tuning screw (31) exposed to the outer surface of the filter tuning cover (30), and an elastic panel portion (332B) that is elastically bent in a U shape with respect to the support panel portion (332A) and has a spiral coupling boss (332C) formed therein for spirally coupling with a portion of the outer surface of the tuning screw (31) that passes through the support panel portion (332A).

[0192] At this time, the solder material (55) can be inserted and applied between the support panel portion (332A) and the elastic panel portion (332B) to solder a plurality of tuning screws (31) to the screw installation holes (35) of the filter tuning cover (30) through the penetration portion of the support panel portion (332A).

[0193] In this way, the filter (1) for a communication device according to the present invention can be transformed and replaced with not only a guide nut (32) that can employ a thin filter tuning cover (30) that is easy to finely adjust the frequency as a screw holding member (32, 132, 232, 332), but also a guide elastic body (132, 232) and a unit clip (332), so that temporary fixation of the tuning screw (31) to the filter tuning cover (30) can be facilitated.

[0194] FIGS. 18a and 18b are variations of the guide nut of FIG. 3, which are variations that temporarily secure solder material without a solder slot.

[0195] In the filter (1) for a communication device according to the present invention as described above, the solder slot variations (51a to 51f) are formed in a cut manner on the guide nut (32), tuning screw (31) and filter tuning cover (30) sides, respectively, to facilitate application of solder material (55).

[0196] However, it is not necessary to apply the solder material (55) through the modified examples (51a to 51f) of the solder slot described above after installation of the tuning screw (31) into the screw installation hole (35), and as described later, the solder material (55a, 55b) can be applied without the modified examples (51a to 51f) of the solder slot as a modified example of the guide nut (32).

[0197] More specifically, as referenced in FIGS. 18a and 18b, a solder seating portion (32d-1, 32d-2) for seating a solder material (55a, 55b) can be formed on the inside of the boss receiving portion (32a) of the guide nut (32).

[0198] Here, the solder mounting portion (32d-1, 32d-2) can be formed as a first embodiment (32d-1) so as to have a cross-section that is slanted downward in the radial direction toward the outer surface of the tuning screw (31).

[0199] In this way, according to the solder fixing portion (32d-1) implemented as the first embodiment, when solder material (55a) is attached in advance to the inclined cross-section portion before locking using the guide nut (32), and then the tuning screw (31) is locked and exposed to a high temperature atmosphere, the molten solder material (55a) flows down the outer peripheral surface of the tuning screw (31) along the inclined cross-section, and then flows into the screw installation hole (35) of the filter tuning cover (30) and hardens, thereby enabling the tuning screw (31) to be fixed by soldering.

[0200] Meanwhile, the solder mounting portion (32d-1, 32d-2) may be formed as a second embodiment (32d-2) to have a groove shape in which a solder material (55b, solder ring) formed to have a circular cross-section is fitted and mounted.

[0201] At this time, the female thread (32-1, boss female thread) of the guide nut (32) forming part of the groove shape described above is formed to be inclined downward toward the outer peripheral surface of the tuning screw (31), so that the solder material (55b) melted on the inside of the groove shape flows along the inclined female thread (32-1) and easily flows into the screw installation hole (35) of the filter tuning cover (30) and hardens, thereby fixing the tuning screw (31) by soldering.

[0202] Figure 19 is a cross-sectional view showing the fine frequency adjustment after soldering the tuning screw with the guide nut.

[0203] A filter (1) for a communication device according to another embodiment of the present invention, as shown in FIG. 19, is disposed on the outside of a filter tuning cover (30), and includes a screw holding member (guide nut (32) of FIG. 19) that forms a moving space (S) for a plurality of tuning screws (31) that are moved by an external force transmitted through a plurality of tuning screws (31) fixed to the filter tuning cover (30) between the filter tuning cover (30) and the filter tuning cover (30).

[0204] Here, the screw holding member (32) can enable fine frequency adjustment by forming the moving space (S) described above between it and the filter tuning cover (30).

[0205] More specifically, the screw holding member (32) serves to temporarily fix a plurality of tuning screws (31) to the screw installation holes (35) of the filter tuning cover (30), and can also serve as a medium for transmitting a moving external force to the tuning screws (31) soldered to the filter tuning cover (30).

[0206] Here, when the screw holding member equipped with the guide nut (32) is rotated in one direction, as shown in (c) of Fig. 19, a part of the filter tuning cover (30) in which the tuning screw (31) and the screw installation hole (35) are formed is slightly pulled upward toward the moving space (S) by the spiral engagement between the female thread (32-1) of the guide nut (32) and the male thread (31-1) of the tuning screw (31).

[0207] In the case of the filter (1) for a communication device according to another embodiment of the present invention, only the fine frequency adjustment process in which the tuning screw (31) moves upward toward the moving space (S) is illustrated and described, but it will be understood that, conversely, fine frequency adjustment in which the tuning screw (31) moves downward in the opposite direction of the moving space (S) according to the rotational direction of the guide nut (32) is also possible.

[0208]

[0209] 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 necessarily 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 is defined by the claims set forth below.

Claims

1. A filter body having at least one cavity having a predetermined space inside and having one side open; A filter tuning cover provided to cover an open side of the filter body and having a plurality of screw installation holes formed therein; A plurality of tuning screws, each of which is fastened to the plurality of screw installation holes and performs fine frequency adjustment by adjusting the distance from the tip of the resonator provided inside the cavity; and A filter for a communication device, comprising: a screw holding member for temporarily fixing the plurality of tuning screws to the filter tuning cover before performing the fine frequency tuning by deforming a portion of the filter tuning cover using each of the plurality of tuning screws; 2. In claim 1, A filter for a communication device, wherein the screw holding member comprises a guide nut that temporarily fixes the tuning screw to the screw installation hole of the filter tuning cover.

3. In claim 2, A filter for a communication device, wherein at least one solder paste application slot (hereinafter referred to as “solder slot”) is formed in one of the plurality of tuning screws and the guide nuts, into which a solder material is inserted for soldering the plurality of tuning screws to the screw installation holes after frequency tuning by each of the plurality of tuning screws.

4. In claim 3, A filter for a communication device, wherein the solder slot is formed in the guide nut, and at least a portion of the female thread of the nut to which the male thread formed on the outer surface of the tuning screw is fastened is removed.

5. In claim 3, A filter for a communication device, wherein the solder slot is formed in the guide nut, and a portion of the end that contacts the filter tuning cover is formed so as to be removed in a radial direction.

6. In claim 3, The above screw installation hole includes an installation boss formed to protrude a predetermined length in the outer direction of the filter tuning cover; A filter for communication equipment, wherein a boss female thread is formed on the inner surface of the above-mentioned installation boss, to which a male thread formed on the outer surface of the above-mentioned tuning screw is connected.

7. In claim 6, The boss female screw of the above installation boss is a filter for communication devices, manufactured using the burring tap method for the filter tuning cover.

8. In claim 6, The above guide nut, A boss receiving portion provided in a form that surrounds the installation boss of the above screw installation hole; and A screw fastening part having a nut female thread formed on the inner surface to which the male thread of the tuning screw is fastened; A filter for a communication device, wherein the solder slot is formed so that the nut female thread of the screw fastening part is removed in the fastening direction of the tuning screw.

9. In claim 6, The above guide nut, A boss receiving portion provided in a form that surrounds the installation boss of the above screw installation hole; and A screw fastening part having a nut female thread formed on the inner surface to which the male thread of the tuning screw is fastened; A filter for a communication device, wherein the solder slot is formed such that a portion of a guide nut including the boss receiving portion and the screw fastening portion is cut from the outer end to the inner end so that the tuning screw is exposed.

10. In claim 8 or claim 9, The outer surface of the above installation boss includes an inner tapered portion whose diameter gradually decreases toward the outer end, A filter for a communication device, wherein the inner surface of the boss receiving portion of the above guide nut includes an outer tapered portion formed to have an inclination angle corresponding to the inner tapered portion of the above installation boss.

11. In claim 2, The above screw installation hole includes an installation boss formed to protrude a predetermined length in the outer direction of the filter tuning cover, The above guide nut includes a boss receiving portion provided in a form that surrounds the installation boss of the screw installation hole, A filter for a communication device, wherein an upper tuning groove or a lower tuning groove is formed by cutting the outer surface or inner surface of the filter tuning cover corresponding to the end of the boss receiving portion of the guide nut so as to be smaller than the thickness of the filter tuning cover.

12. In claim 3, A filter for a communication device, wherein the solder slot is formed in the tuning screw, and at least a portion of the male screw thread formed on the outer surface of the tuning screw is removed.

13. In claim 12, A filter for a communication device, wherein the solder slot is formed in a straight line in the fastening direction with respect to the screw installation hole.

14. In claim 3, A filter for a communication device, wherein the solder slot is formed in the tuning screw, and is cut from the upper center of the tuning screw to the lower side by a predetermined length and is cut so as to be connected to the screw installation hole.

15. In claim 3, A filter for a communication device, wherein at least one of the upper and lower portions of the guide nut is further provided with an additional space step portion so that a portion including the solder slot is cut out stepwise.

16. In claim 3, A filter for a communication device, wherein the fine frequency adjustment is performed according to the rotation direction of the guide nut after soldering the tuning screw and the filter tuning cover through the solder slot.

17. In claim 3, On the outer surface of the above filter tuning cover, an upper tuning groove is further formed so that the maximum radius is smaller than the distance from the center of the screw installation hole to the outer surface of the guide nut. A filter for a communication device, wherein a step portion is additionally formed in the upper tuning groove portion to be smaller than the depth of the upper tuning groove portion in the periphery of the screw installation hole.

18. In claim 3, If the material of the above filter body and the above filter tuning cover is aluminum (or alloy aluminum), A filter for communication devices, wherein the material of the above guide nut is made of a material having a higher high-frequency response than the filter body and the filter tuning cover, which are made of the above aluminum (or alloy aluminum).

19. In claim 3, The above screw installation hole includes an installation boss formed so that the inner edge end protrudes into the cavity in a burring tab manner; A filter for communication equipment, wherein a boss female thread is formed on the inner surface of the above-mentioned installation boss, to which a male thread formed on the outer surface of the above-mentioned tuning screw is connected.

20. In claim 8 or claim 9, A filter for a communication device, wherein a solder mounting portion for mounting the solder material is formed on the inside of the boss receiving portion of the above guide nut.

21. In claim 20, A filter for a communication device, wherein the solder mounting portion is formed to have a cross-section that is slanted downward in the radial direction toward the outer surface of the tuning screw.

22. In claim 20, A filter for a communication device, wherein the solder mounting portion is formed to have a groove shape into which a solder ring formed to have a circular cross-section is fitted.

23. In claim 1, A filter for a communication device, wherein the screw holding member comprises a guide elastic body, one end of which is supported on the outer surface of the filter tuning cover, and the other end of which is helically connected to a male screw thread formed on the outer surface of at least a plurality of tuning screws.

24. In claim 23, A filter for a communication device, wherein the above guide elastic body is a plate-shaped spring member having a predetermined thickness.

25. In claim 24, A filter for a communication device, wherein the other end of the plate-shaped spring member that is helically connected to the male screw threads of the plurality of tuning screws is formed with a thickness smaller than the screw pitch of the male screw threads of the plurality of tuning screws.

26. In claim 24, The above plate-shaped spring member is a filter for a communication device, made of either a plastic plate or a metal plate.

27. In claim 23, A filter for a communication device, wherein the above guide elastic body is a spring member whose diameter gradually decreases from one end to the other end.

28. In claim 27, A filter for a communication device, wherein the other end of the spring member that is helically connected to the male threads of the plurality of tuning screws is formed to have a circular cross-section with a diameter smaller than the helical pitch of the male threads of the plurality of tuning screws.

29. In claim 24 or claim 27, A filter for a communication device, wherein a solder material for soldering the plurality of tuning screws to the screw installation holes of the filter tuning cover is inserted and applied through a space between one end and the other end of the plate-shaped spring member and the spring member.

30. In claim 1, The above screw holding member, A filter for a communication device, comprising: a unit clip that is coupled with a portion exposed to the outside of the filter tuning cover among the tuning screws that are spirally coupled to the screw installation hole of the filter tuning cover, thereby temporarily fixing the tuning screw; 31. In claim 30, The above unit clip is, A support panel portion having a surface supported on the outer surface of the filter tuning cover and a penetration portion formed therein for penetrating the tuning screw exposed to the outer surface of the filter tuning cover; and A filter for a communication device, comprising: an elastic panel portion that is elastically bent in a U shape with respect to the support panel portion, and a spiral coupling boss formed thereon that is spirally coupled with a portion of the outer surface of the tuning screw that penetrates the support panel portion; 32. In claim 30, A filter for a communication device, wherein a solder material is inserted and applied between the support panel portion and the elastic panel portion to solder the plurality of tuning screws to the screw installation holes of the filter tuning cover through the penetration portion of the support panel portion.

33. A filter body having at least one cavity having a predetermined space therein and having one side open; A filter tuning cover provided to cover an open side of the filter body and having a plurality of screw installation holes formed therein; A plurality of tuning screws each fastened to a plurality of screw installation holes; and A filter for a communication device, comprising: a screw holding member disposed on the outside of the filter tuning cover, the screw holding member forming a moving space for the plurality of tuning screws that are moved by an external force transmitted through the plurality of tuning screws fixed to the filter tuning cover between the filter tuning cover and the filter tuning cover;

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