Filter for communication device

Abstract

The present invention relates to a filter for a communication device, and more particularly, to a filter for a communication device, comprising: a filter main body in which at least one cavity as a predetermined space is formed and which is open at one side; a filter tuning cover configured to cover one side of the opening of the filter body and formed with a plurality of screw mounting holes; a plurality of tuning screws which are respectively fastened to the plurality of screw mounting holes and perform fine frequency adjustment by adjusting the spacing distance from the tip of a resonator disposed inside the cavity; and a screw holding member that temporarily fixes the plurality of tuning screws to the filter tuning cover before the fine frequency tuning is performed by an action of deforming the shape of a portion of the filter tuning cover using the plurality of tuning screws, respectively. Furthermore, the present invention provides the advantage of minimizing the occurrence of PIMD and enabling fine frequency adjustment to be easily performed.

Description

Technical Field

[0001] This invention relates to a filter for communication equipment, and more specifically, to a filter for communication equipment that minimizes PIMD (passive intermodulation distortion) and improves communication quality. Background Technology

[0002] With the evolution of mobile communication technology, data transmission speed is increasing exponentially. In order to improve the sensitivity of transmission and reception as data transmission increases, there is a trend of gradually increasing the transmission power of base stations.

[0003] These transceiver filters or duplexers, which are essential equipment in base stations to prevent interference between transceiver terminals, are mainly implemented using coaxial resonators made of metal materials with high power resistance to withstand high power.

[0004] In addition, the filters used in mobile communication base stations require accurate and uniform frequency characteristics. Therefore, the characteristics become very sensitive due to the mechanical tolerances generated during the manufacturing and assembly of each component. Thus, the resonant frequency is adjusted by using metal tuning screws (hereinafter referred to as "tuning screws") on the upper cover of the housing that constitutes the coaxial resonator, thereby achieving the filtering characteristics required by the filter.

[0005] On the other hand, in filters that are passive components, intermodulation distortion signals may appear in the nonlinear characteristics caused by incomplete metal contact, metal debris, dust, etc., which is called PIMD (passive intermodulation distortion).

[0006] Figure 1 This is an exploded 3D view showing a typical passive component filter; Figure 2 It is shown in Figure 1 A cross-sectional view of the tuning structure formed by the tuning screw in the structure.

[0007] like Figure 1 and Figure 2 As shown, the existing passive component filter 1 has: a housing 2, forming a cavity C inside; at least one resonator 3, disposed within the cavity C; a filter tuning cover 5, attached to the open upper side of the housing 2; a tuning screw 7, through-mounted in a screw mounting hole 6 formed in the filter tuning cover 5; and a nut 8 for locking the tuning screw 7 in the position where frequency adjustment is completed.

[0008] Recently, in order to further apply the capacitor based on the spacing distance D between the resonator 3 and the tuning screw 7 to higher frequency bands (hundreds of MHz), there is a tendency to flexibly utilize the capacitor formed in the spacing space between the inner circumference of the screw mounting hole 6 of the filter tuning cover 5 and the outer circumference of the tuning screw 7.

[0009] However, in Figure 1 and Figure 2 The frequency tuning structure shown is actually a threaded assembly method that uses the threads formed on the outer peripheral surface of the tuning screw 7 to directly rub against the screw mounting hole 6. From this point of view, discontinuous contact is generated, and during the frequency tuning process, the friction between the tuning screw 7 and the screw mounting hole 6 can generate gold-plated powder (fine metal powder), which is the main cause of PIMD.

[0010] In particular, filters used in communication equipment typically employ dozens of tuning screws to adjust frequency characteristics. From this perspective, the following problems exist: it is difficult to fundamentally eliminate PIMD problems, or it is difficult to ensure that each product has the same characteristics. Products that cannot be optimized through repair or rework should be discarded.

[0011] In addition, PIMD performance verification can only be carried out after all product performance has been verified, which results in more time and cost compared to the repair of ordinary non-compliant products. Summary of the Invention

[0012] (The problem to be solved)

[0013] The present invention was proposed to solve the above-mentioned technical problems, and its purpose is to provide a filter for communication devices that can minimize the occurrence of PIMD.

[0014] Meanwhile, another object of the present invention is to provide a filter for communication devices that has solder paste application slots (welding slots) formed thereon, and that a tuning screw for frequency tuning (adjustment) can be easily fixed to the filter tuning cover by means of soldering.

[0015] Another object of the present invention is to provide a filter for communication devices that simplifies the process of soldering tuning screws to screw mounting holes using solder material.

[0016] The subject matter of this invention is not limited to the subject matter mentioned above, and other subject matters not mentioned will be clearly understood by those skilled in the art from the following description.

[0017] (Solutions)

[0018] A filter for a communication device according to an embodiment of the present invention includes: a filter body having at least one cavity formed therein as a predetermined space and an opening on one side; a filter tuning cover configured to cover one side of the opening of the filter body and having a plurality of screw mounting holes; a plurality of tuning screws respectively fastened to the plurality of screw mounting holes, performing fine frequency adjustment by adjusting the spacing between the screws and the front end of a resonator disposed inside the cavity; and a screw retaining member temporarily fixing the plurality of tuning screws to the filter tuning cover before performing the fine frequency adjustment by deforming a portion of the filter tuning cover using the plurality of tuning screws respectively.

[0019] Here, the screw retaining component may include a guide nut that intervenes in the screw mounting hole of the filter tuning cover to temporarily secure the tuning screw.

[0020] Additionally, at least one solder paste application slot (hereinafter referred to as "soldering slot") may be formed in any of the plurality of tuning screws and the guide nut, into which solder material is inserted for welding the plurality of tuning screws to the screw mounting hole after the frequencies are respectively tuned by the plurality of tuning screws.

[0021] Additionally, the welding slot is formed in the guide nut and may be formed by removing at least a portion of the female thread of the nut, the female thread of the nut being fastened to the male thread formed on the outer peripheral surface of the tuning screw.

[0022] Additionally, the welding slot is formed in the guide nut and may be formed by removing a portion of the end that contacts the filter tuning cover in the radial direction.

[0023] In addition, the screw mounting hole includes a mounting boss that protrudes a predetermined length outward from the filter tuning cover; a female thread can be formed on the inner circumferential surface of the mounting boss, and the female thread is fastened to the male thread formed on the outer circumferential surface of the tuning screw.

[0024] In addition, the female thread of the mounting boss can be made by using a flanging and tapping method for the filter tuning cover.

[0025] Additionally, the guide nut includes: a boss receiving portion configured to surround the screw mounting hole; and a screw fastening portion having a nut female thread formed on its inner circumferential surface to fasten the tuning screw; the welding slot may be formed by removing the nut female thread of the screw fastening portion in the tightening direction of the tuning screw.

[0026] Additionally, the guide nut includes: a boss receiving portion configured to surround the mounting boss of the screw mounting hole; and a screw fastening portion having a female nut thread forming a male thread for fastening the tuning screw on its inner circumferential surface; the welding slot may be formed by cutting a portion of the guide nut including the boss receiving portion and the screw fastening portion to expose the tuning screw from the outer end to the inner side.

[0027] In addition, the outer peripheral surface of the mounting boss includes an inner tapered portion, the inner tapered portion having a diameter that gradually decreases towards the outer end; the inner peripheral surface of the boss receiving portion of the guide nut may include an outer tapered portion, the outer tapered portion being formed to have an inclination angle corresponding to the inner tapered portion of the mounting boss.

[0028] Additionally, an upper tuning groove or a lower tuning groove can be formed on the outer or inner side of the filter tuning cover corresponding to the end of the boss receiving portion of the guide nut, with a thickness less than that of the filter tuning cover.

[0029] Additionally, the welding slot is formed on the tuning screw, and may be formed by removing at least a portion of the male thread formed on the outer peripheral surface of the tuning screw.

[0030] In addition, the welding slot can be formed in a straight line with respect to the tightening direction of the screw mounting hole.

[0031] Additionally, the welding slot is formed on the tuning screw and is cut to a predetermined length from the upper center of the tuning screw to the lower end side, and can be cut to connect to the screw mounting hole side.

[0032] Additionally, at least one of the upper and lower ends of the guide nut may be formed with an additional space step to cut a portion of the welding slot in a stepped manner.

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

[0034] In addition, an upper tuning groove is formed on the outer side of the filter tuning cover. The upper tuning groove is formed such that its maximum radius is smaller than the distance from the center of the screw mounting hole to the outer side of the guide nut. In the upper tuning groove, a step is also formed around the screw mounting hole, such that the step is smaller than the depth of the upper tuning groove.

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

[0036] In addition, the screw mounting hole includes a mounting boss, which is formed such that the inner side frame end protrudes into the cavity by means of flanging and tapping; a female thread can be formed on the inner circumferential surface of the mounting boss to fasten the male thread formed on the outer circumferential surface of the tuning screw.

[0037] Additionally, a solder placement portion for placing the solder material can be formed inside the boss receiving portion of the guide nut.

[0038] Additionally, the solder placement portion may be formed with a cross-section that slopes downward in a radial direction toward the outer peripheral surface of the tuning screw.

[0039] Additionally, the solder placement portion may be formed with grooves to insert and mount a solder ring with a circular cross-section.

[0040] Additionally, the screw retaining component may include a guiding elastomer, one end of which is supported on the outer surface of the filter tuning cover, and the other end is at least helically engaged with a male thread formed on the outer peripheral surface of the plurality of tuning screws.

[0041] In addition, the guiding elastomer is a leaf spring component with a predetermined thickness.

[0042] Additionally, the other end of the leaf spring component, which is helically engaged with the male threads of the plurality of tuning screws, may be formed with a thickness smaller than the pitch of the male threads of the plurality of tuning screws.

[0043] In addition, the leaf spring component can be made of either plastic sheet or metal sheet.

[0044] Alternatively, the guiding elastomer may be a spring component whose diameter gradually decreases from one end to the other end.

[0045] Additionally, the other end of the spring component, which is helically engaged with the male threads of the plurality of tuning screws, may be formed with a circular cross-section having a pitch smaller than that of the male threads of the plurality of tuning screws.

[0046] Additionally, solder material can be inserted through the gap between one end and the other end of each of the leaf spring component and the spring component to weld the plurality of tuning screws to the screw mounting holes of the filter tuning cover.

[0047] Additionally, the screw retaining component may include a U-shaped nut clip that engages with a portion of the tuning screw exposed on the outside of the filter tuning cover in a screw mounting hole screwed into the filter tuning cover, to temporarily secure the tuning screw.

[0048] Additionally, the U-shaped nut clamp may include: a support panel portion supported on the outer side of the filter tuning cover and having a through portion for the tuning screw exposed on the outer side of the filter tuning cover to pass through; and an elastic panel portion elastically bent into a U-shape relative to the support panel portion and having a threaded engagement boss, the threaded engagement boss being threadedly engaged with a portion of the outer peripheral surface of the tuning screw passing through the support panel portion.

[0049] Additionally, a solder-coated material can be inserted between the support panel and the elastic panel to weld the plurality of tuning screws to the screw mounting holes of the filter tuning cover through the through portion of the support panel.

[0050] A filter for a communication device according to another embodiment of the present invention includes: a filter body having at least one cavity formed inside as a predetermined space and an opening on one side; a filter tuning cover configured to cover one side of the opening of the filter body and having a plurality of screw mounting holes; a plurality of tuning screws respectively fastened to the plurality of screw mounting holes; and a screw retaining member disposed outside the filter tuning cover and forming a movement space between the member and the filter tuning cover for the plurality of tuning screws, wherein the plurality of tuning screws are moved by an external force transmitted by the plurality of tuning screws fixed to the filter tuning cover.

[0051] (The effect of the invention)

[0052] The filter for communication devices according to embodiments of the present invention can achieve the following various effects.

[0053] First, by welding, the gap between the screw mounting hole and the tuning screw is completely filled, fundamentally eliminating the incomplete contact between the tuning screw and the screw mounting hole of the filter tuning cover, thus also fundamentally preventing the occurrence of PIMD.

[0054] Secondly, by welding and fixing with solder material through a welding slot that forms an integral part with the guide nut or tuning screw, the tuning screw will not be loosened. Therefore, there is no need for strong torque locking, and the filter tuning cover can be made of thin material, thus reducing product weight and saving manufacturing costs.

[0055] Third, by fixing the tuning screw by welding, there is no need for separate coating of epoxy resin or other materials for screw fixing, thus saving on product manufacturing costs.

[0056] Fourth, the guide nut is made of a metal that is difficult to weld or a heat-resistant plastic, such as SUS (stainless steel). From this point of view, it can also be removed (separated) after the tuning screw is welded to the filter tuning cover, thus having the effect of being reusable after welding.

[0057] Fifth, typically after frequency tuning, tuning screws are fixed to the filter tuning cover by welding. This fixation method makes frequency readjustment impossible. However, unlike the prior art, this method allows for additional frequency readjustment of the filter even after the tuning screws are welded to the filter tuning cover or when frequency characteristics change during manufacturing. Attached Figure Description

[0058] Figure 1 This is an exploded 3D view showing a typical passive component filter;

[0059] Figure 2 It is shown Figure 1 A cross-sectional view of the tuning structure utilizing the tuning screw in the structure;

[0060] Figure 3 A cross-sectional view of a guide nut in a screw-retaining component is provided as an example of a filter for a communication device according to an embodiment of the present invention.

[0061] Figure 4a It is shown Figure 3 A partially enlarged view of the mounting configuration of the tuning screw in the structure;

[0062] Figure 4b yes Figure 4a Exploded 3D diagram;

[0063] Figure 5 It is shown Figure 3 The cross-sectional view (a), plan view (b), and bottom view (c) of the first to third implementation examples of the welding slot formed by the guide nut in the structure;

[0064] Figure 6 It is shown Figure 5 The cross-sectional view (a) and plan view (b) show the welding process performed by the welding slot in the third implementation example in the structure.

[0065] Figure 7 It is shown Figure 3 The fourth implementation example of the structure in which the tuning screw is formed has 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 the tuning screw.

[0066] Figure 8 It is shown Figure 3 The fifth implementation example of the structure in which the tuning screw is formed has a plan view and a cross-sectional view (a) and a plan view, a cross-sectional view and a side view (b) of the tuning screw.

[0067] Figure 9 It is shown Figure 3 Plan view and cross-sectional view of the welding slot in the sixth implementation example of the filter tuning cover in the structure;

[0068] Figure 10 The diagram shows a cross-sectional view (a) and a plan view (b) of 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 a portion of the structure (guide nut).

[0069] Figure 11 This is a cross-sectional view showing the locking process of the guide nut of a filter for a communication device according to another embodiment of the present invention;

[0070] Figure 12 This is a cross-sectional view showing the fine adjustment (tuning) of a filter in a communication device according to an embodiment of the present invention after the tuning screw is fixed.

[0071] Figure 13 It is shown Figure 3 Cross-sectional and plan views of various embodiments of the groove portion of the filter tuning cover in the structure;

[0072] Figure 14 These are cross-sectional and plan views showing a modified example of the groove portion of the filter tuning cover when a guide nut without a separately configured boss receiving portion is used.

[0073] Figure 15 It is applicable Figure 3 Plan view and cross-sectional view of another example of the mounting boss in the structure;

[0074] Figure 16a and Figure 16b As another embodiment of the present invention, cross-sectional views (a), plan views (b), and side views (c) are shown, illustrating various implementations of the guide elastomer in the screw retaining member;

[0075] Figure 17 As another embodiment of the present invention, a perspective view is shown of the U-shaped nut clip in the screw retaining component;

[0076] Figure 18a and Figure 18b As Figure 3The modified example of the guide nut is a modified example of temporarily fixing the solder material without welding slots;

[0077] Figure 19 This is a cross-sectional view showing the fine frequency adjustment after the tuning screw is fixed by welding a guide nut.

[0078] (Explanation of reference numerals in the attached diagram)

[0079] C: Cavity 10: Filter housing

[0080] 20: Filter body 30: Filter tuning cover

[0081] 31: Tuning screw; 31-1: Male thread

[0082] 32: Guide nut; 32-1: Female thread of the nut.

[0083] 32a: Boss receiving part; 32a-2: Outer conical part

[0084] 32b: Screw fastening part; 35: Screw mounting hole

[0085] 35a: Mounting boss; 35-1: Female thread of the boss.

[0086] 35-2: Inner conical part; 37a: Upper tuning groove part

[0087] 37b: Lower tuning slot section; 40: Resonator

[0088] 41: Resonator body 42: Resonator disk panel

[0089] 50: Welding slot; 51a~51f: Welding slot

[0090] 55, 55a, 55b: Solder material

[0091] 132, 232: Guide elastomer; 332: U-shaped nut clamp. Detailed Implementation

[0092] Hereinafter, a filter for a communication device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0093] When assigning reference numerals to components in the various figures, care should be taken to ensure that identical components are used as much as possible, even when shown in different figures. Furthermore, when describing embodiments of the invention, if it is determined that a detailed description of a known structure or function would hinder understanding of the embodiments, that detailed description will be omitted.

[0094] When describing the components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are merely used to distinguish one component from others and should not limit the nature or order of the components. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having the same meaning as in relevant technical articles and should not be interpreted in an ideal or overly formal sense unless expressly defined herein.

[0095] Figure 3 A cross-sectional view of a guide nut in a screw-retaining component is provided as an example of a filter for a communication device according to an embodiment of the present invention. Figure 4a It is shown Figure 3 A partially enlarged view of the mounting configuration of the tuning screw in the structure; Figure 4b yes Figure 4a An exploded 3D diagram.

[0096] The filter 1 for communication devices according to the present invention relates to a technical feature that minimizes the generation of fine metal powder (particles) during the adjustment (tuning) of the frequency using the tuning screw 31 described later, thereby minimizing PIMD, and can be implemented by various embodiments and implementation examples as follows.

[0097] First, refer to Figures 3 to 4b The filter 1 for communication devices according to the present invention may include a filter housing 10, wherein at least one cavity C forming a predetermined space inside the filter housing 10.

[0098] The filter housing 10 may include: a filter body 20, which is generally open at the upper part in the figure and is shaped as one side of an open cavity C; and a filter tuning cover 30, which is combined to close one side of the opening of the filter body 20 and has a plurality of screw mounting holes 35 for mounting a plurality of tuning screws 31 described later.

[0099] Each resonator 40, which is typically configured to be located within the cavity C and described later, is frequency tuned by a tuning screw 31. From this perspective, it is preferable to design the number of tuning screws 31 to be the same as the number of resonators 40.

[0100] Here, the outer surface of the filter housing 10 and the inner surfaces of the filter body 20 forming the cavity C and the filter tuning cover 30 can be configured to be fully coated with a film made of a predetermined metal material.

[0101] At this time, the metal material constituting the coating can be aluminum (or aluminum alloy), and the materials of the filter body 20 and the filter tuning cover 30 when the coating is not formed are also preferably aluminum (or aluminum alloy).

[0102] On the other hand, the filter 1 for communication devices according to the present invention may further include a plurality of resonators 40, which are fixed to the bottom surface of the cavity C formed by the filter body 20 of the filter housing 10 and configured to extend their front ends toward the opening side of the cavity C.

[0103] The plurality of resonators 40 may each include a resonant body 41 and a resonator disk panel 42, wherein the resonator disk panel 42 is configured to have a panel shape with a diameter greater than that of the resonant body 41, and is either integrated into one piece or manufactured separately and then integrated at the front end adjacent to the filter tuning cover 30.

[0104] Here, as Figures 3 to 4b As shown, the filter 1 for communication devices according to the present invention further includes a plurality of tuning screws 31, which are configured to be movable in the up-down direction at least inside the cavity C, so that the upper and lower ends are positioned above the resonator disk panel 42 as shown in the figures.

[0105] Multiple tuning screws 31 are made of a metallic material that is conductive, and their spacing relative to the upper surface of the resonator disk panel 42 inside the cavity C is adjusted (see reference). Figure 2 The attached diagram (labeled "D") can generate the resonant frequency characteristics desired by the designer.

[0106] On the other hand, the multiple tuning screws 31 are installed by screw assembly method with respect to multiple screw mounting holes 35 respectively. As the tuning screws 31 rotate in one direction and in another direction, the height of the lower end can be adjusted as shown in the figure to adjust the resonant frequency characteristic value in the cavity C.

[0107] In particular, the tuning screw 31 can be directly threaded into the screw mounting hole 35, however, as Figures 3 to 4b As shown, the retaining component can of course be secured by a screw (refer to 32 and the postoperative part). Figure 16a (And the following attached figures 132, 232, 332) are installed in the screw mounting holes 35 of the filter tuning cover 30.

[0108] Here, the screw retaining components 32, 132, 232, and 332 are used to prevent changes in the originally adjusted resonant frequency characteristic value after the tuning screw 31 is first adjusted to the resonant frequency characteristic value desired by the designer. This is because factors such as gap (wobbling) change the distance between the lower end of the tuning screw 31 and the resonator disk panel 42.

[0109] like Figures 3 to 4b As shown, the screw holding components 32, 132, 232, 332 that perform the functions described above may include a guide nut 32 that intervenes in the temporary fixation of the tuning screw 31 to the screw mounting hole 35 of the filter tuning cover 30.

[0110] However, the screw retaining components 32, 132, 232, and 332 are not limited to the structure of the guide nut 32 as described above, but can be implemented by any one of the guide elastomers 132 and 232 and the U-shaped nut clip 332; as described later. Figure 16a and Figure 16b As shown, the guide elastomers 132 and 232 have one end supported on the outer surface of the filter tuning cover 30, while the other end is at least threaded into the male thread 31-1 formed on the outer peripheral surface of the plurality of tuning screws 31; as Figure 17 As shown, the U-shaped nut clip 332 engages with the portion of the tuning screw 31 exposed on the outside of the filter tuning cover 30 in the screw mounting hole 35 of the filter tuning cover 30 to temporarily fix the tuning screw 31.

[0111] In the following, the main shapes and functions of the guide elastomer 132 and the U-shaped nut clip 332 in the screw retaining components 32, 132, 232 and 332 will be explained in more detail, with the guide nut 32 as the representative structure.

[0112] Here, the filter 1 for communication devices according to the present invention can form a solder paste application slot (hereinafter referred to as "soldering slot"), which is formed in any one of a plurality of tuning screws 31 and a guide nut 32, and after the frequency is tuned by the plurality of tuning screws 31 respectively, solder material is inserted to weld the plurality of tuning screws 31 to the screw mounting hole 35.

[0113] The welding slot 50 serves not only as a location for providing solder paste, one of the soldering materials, but also as a means to weld and fix the tuning screw 31 to the filter tuning cover 30 when the solder paste melts under high temperature.

[0114] As described above, the welding slot 50 can be integrally formed with the guide nut 32 or with the tuning screw 31. Hereinafter, according to the implementation example, the welding slot 50 formed in the guide nut 32 is defined as the nut-side welding slots 51a, 51b, and 51c, while the welding slot 50 formed in the tuning screw 31 is defined as the screw-side welding slot 52.

[0115] Figure 5 It is shown Figure 3The cross-sectional view (a), plan view (b), and bottom view (c) of the first to third implementation examples of the welding slot formed by the guide nut in the structure; Figure 6 It is shown Figure 5 The cross-sectional view (a) and plan view (b) show the welding process performed by the welding slot in the third implementation example in the structure. Figure 7 It is shown Figure 3 The fourth implementation example of the structure in which the tuning screw is formed has 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 the tuning screw. Figure 8 It is shown Figure 3 The fifth implementation example of the structure in which the tuning screw is formed has a plan view and a cross-sectional view (a) and a plan view, a cross-sectional view and a side view (b) of the tuning screw. Figure 9 It is shown Figure 3 The plan view and cross-sectional view of the welding slot formed in the sixth implementation example of the filter tuning cover in the structure.

[0116] First, the welding slots 51a to 51c, which are integrally formed with the guide nut 32, will be described below.

[0117] like Figure 5 and Figure 6 As shown, the guide nut 32 is formed with an outer surface having various horizontal cross-sections such as approximately hexagonal or quadrilateral, and is formed with a hollow portion that extends through the middle in the vertical direction. A female nut thread 32-1 can be machined on the inner circumferential surface corresponding to the hollow portion for fastening the male thread 31-1 formed on the outer circumferential surface of the tuning screw 31.

[0118] As described above, the guide nut 32 can be made of metal or heat-resistant plastic. If made of metal, it can be plated with nickel or chromium to prevent it from being welded together with the tuning screw 31 and the filter tuning cover 30 described later. This is because, since the guide nut 32 can rotate relative to the tuning screw 31, fine frequency adjustments can be performed by changing the shape of the filter tuning cover 30, which is one of the special operating features of the present invention.

[0119] However, when the tuning screw 31 is fixed by welding the welding slot 50 of the guide nut 32, it is not possible to rule out the method of melting the solder material 55 by a high-frequency heater (not shown). Therefore, the material of the guide nut 32 in this case can be a metal with high high-frequency reaction (for example, a metal that is used as a material for a magnet that is vertically attached to a magnet of less than 500G, such as carbon steel or STS430).

[0120] At this time, the solder material 55 is usually made of low-temperature lead with a low melting point. When the same low-temperature lead is used as the solder material for the filter tuning cover 30 of the filter body 20, the high-frequency responsiveness of the filter body 20 and the filter tuning cover 30 made of aluminum (or aluminum alloy) is relatively lower than that of the guide nut 32.

[0121] Therefore, assuming that the filter body 20 and the filter tuning cover 30 are heated to 100°C at the same frequency output, the solder material (low-temperature lead) 55 in the welding slot 50, which is welded together by the high-frequency reactive guide nut 32, can be easily raised to above the melting point. This prevents the solder material (low-temperature lead) used to weld the relatively low-frequency reactive aluminum material of the filter body 20 and the filter tuning cover 30 from over-melting, thereby preventing the problem of changes in RF characteristics from occurring in advance.

[0122] For reference, as will be described later, the tuning screw 31 and the filter tuning cover 30 must be fixed by welding using solder material 55. In this respect, unlike the guide nut 32, it is required to be made of a material that is easy to weld or to be pre-plated for welding.

[0123] Here, the nut-side welding slots 51a, 51b, and 51c may include: the welding slot 51a of the first implementation example, such as... Figure 5 As shown in (a), a groove shape is formed to remove a portion of the female nut thread 32-1 formed in the hollow portion of the guide nut 32; the welding slot 51b of the second implementation example, as... Figure 5 As shown in (b), it is formed into a slot shape that connects the outer surface of the guide nut 32 to the hollow space; the welding slot 51c of the third implementation example, as Figure 5 As shown in (c), it is formed by removing a portion of the end that contacts the filter tuning cover 30 with a radius portion.

[0124] On the other hand, such as Figures 3 to 6 As shown, the filter 100 for communication devices according to the present invention may further include a screw mounting hole 35 formed in the filter tuning cover 30 for mounting (or fastening) tuning screws 31 to the filter tuning cover 30.

[0125] The screw mounting hole 35 is formed as a circular hole shape connecting the outer space of the filter tuning cover 30 and the cavity C, and a female thread (the boss female thread 35-1 described later) can be formed at the inner peripheral end (the surface forming the thickness) for fastening with the male thread 31-1 formed on the outer peripheral surface of the tuning screw 31.

[0126] Here, the screw mounting hole 35 can also be formed as a simple hole shape, such as... Figure 4a and Figure 4bAs shown, the boss shape can be configured to include a mounting boss 35a that protrudes a predetermined length in the direction of the filter tuning cover 30.

[0127] The aforementioned female thread 35-1 of the boss 35a is formed by machining the inner circumferential surface of the mounting boss 35a. The female thread 35-1 of the boss is made (machined) by the burring tap method for the filter tuning cover 30.

[0128] When the screw mounting hole 35 is formed in the filter tuning cover 30 by using the flanging and tapping method described above, it is easy to manufacture a boss female thread 35-1 for the inner peripheral end of the screw mounting hole 35 of the filter tuning cover 30 which is manufactured with a thinner specification. Moreover, it provides the advantage that a filter tuning cover 30 with a thinner specification can be used.

[0129] For reference, when the filter tuning cover 30 is made of a thinner thickness, as described later, after the tuning screw 31 is fixed to the screw mounting hole 35, the shape of the filter tuning cover 30 used for subsequent fine frequency adjustments increases, thus having the advantage of being able to readjust over a wider frequency range.

[0130] As described above, assuming the screw mounting hole 35 is configured as a boss shape, such as Figure 3 and Figure 5 As shown in the first and second implementation examples, the guide nut 32 may include a boss receiving portion 32a and a screw fastening portion 32b. The boss receiving portion 32a is configured to surround the mounting boss 35a of the screw mounting hole 35. The inner circumferential surface of the screw fastening portion 32b forms a nut female thread 32-1 for fastening the male thread 31-1 of the tuning screw 31.

[0131] However, as Figure 5 As shown in the welding slot 51c of the third implementation example, the guide nut 32 is a structure for fixing the tuning screw 31, wherein the tuning screw 31 is fastened to the screw mounting hole 35 with a simple hole shape without forming a mounting boss 35a, and there is no need to separately configure the boss receiving part 32a.

[0132] Here, as Figure 5 As shown, in the first implementation example, the welding slot 51a is configured with, as follows: Figures 3 to 4b In the case of the boss receiving portion 32a of the screw mounting hole 35 shown, it can be formed such that the nut female thread 32-1 formed on the hollow inner circumferential surface of the screw fastening portion 32b, excluding the boss receiving portion 32a, is removed.

[0133] In addition, such as Figure 5As shown, in the second implementation example, the welding slot 51b can be formed to remove the female thread 32-1 of the nut to include, for example... Figures 3 to 4b The shape of the boss receiving portion 32a of the screw mounting hole 35 shown.

[0134] At this point, as described above, the difference in the welding slot 51b of the second implementation example is that it is formed in the shape of a slot so that the hollow part is connected to the outer side of the guide nut 32.

[0135] However, in the third implementation example, the welding slot 51c is formed without a boss receiving portion 32a in the screw mounting hole 35 of the filter tuning cover 30, and is formed by removing a portion of the end of the guide nut 32 that contacts the filter tuning cover 30 in the radial direction, and by cutting a portion of the guide nut 32 from the outer end to the inner end to expose the tuning screw 31.

[0136] If frequency adjustment is completed by fastening the tuning screw 31 to the screw mounting hole 35, then after applying solder material 55 (solder paste) to the welding slots 51a to 51c of the above-described implementation examples and maintaining it in a high-temperature environment (or a predetermined high-frequency environment) 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 welding.

[0137] At this time, as Figure 4a As shown, the solder material 55 applied by the welding slot 51a of the first embodiment and the welding slot 51b of the second embodiment melts in a high-temperature environment while being applied to the front end of the mounting boss 35a of the screw mounting hole 35, and penetrates and fills between the female thread 35-1 of the boss formed on the inner circumferential surface of the mounting boss 35a and the male thread 31-1 of the tuning screw 31, thereby completely eliminating the generation of fine metal powder (particles), a common cause of PIMD problems.

[0138] In addition, such as Figure 6 As shown, the solder material 55 applied by the welding slot 51c in the third implementation example is such that, when applied between the outer edge of the screw mounting hole 35 and the tuning screw 31, it melts in a high-temperature environment and can penetrate and fill between the female thread 35-1 of the boss and the male thread 31-1 of the tuning screw 31.

[0139] Reference Figures 3 to 6 The welding slots 51a to 51c described in the various implementation examples are implementation examples formed in the guide nut 32.

[0140] However, it is not necessary to weld the 50 slots formed on the guide nut 32, but rather as follows: Figure 7 and Figure 8 As shown, it can also be formed on the tuning screw 31, such as Figure 9 As shown, it can also be formed on the filter tuning cover 30.

[0141] More specifically, such as Figure 7 As shown, the welding slot 51d in the fourth implementation example is formed on the tuning screw 31, and may be formed by removing at least a portion of the male thread 31-1 formed on the outer peripheral surface of the tuning screw 31.

[0142] The welding slot 51d described above can be formed in a straight line in the direction of fastening the tuning screw 31 to the screw mounting hole 35.

[0143] At the same time, such as Figure 8 As shown, according to the fifth implementation example, the welding slot 51e is formed on the tuning screw 31, and a predetermined length is cut from the upper center of the tuning screw 31 to the lower end side, and the cutting process is made to connect to the screw mounting hole 35 side.

[0144] Here, the welding slot 51e in the fifth implementation example may include a solder material injection section 51e-1 and a solder material guide hole 51e-2. The solder material injection section 51e-1 is cut off from the upper center of the tuning screw 31 to the lower end side by a predetermined length to have a circular horizontal cross section or a polygonal horizontal cross section. The solder material guide hole 51e-2 communicates orthogonally with the screw mounting hole 35 side at the lower end of the solder material injection section 51e-1.

[0145] If solder material 55 is injected into the solder material injection section 51e-1 of the welding slot 51e in the fifth embodiment and then exposed to a high temperature environment to melt, it will move through the solder material guide hole 51e-2 toward the female thread 32-1 side of the guide nut 32 and penetrate into the female thread 35-1 (boss female thread) side of the screw mounting hole 35 side below and be solidified. Welding can be performed through this action.

[0146] At this point, the guide nut 32 is gold-plated, or nickel-plated or chromium-plated, which are not compatible with the solder material 55. Therefore, 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 will not be welded together. Fine frequency adjustments can then be made by moving the tuning screw 31 along the rotation direction of the guide nut 32. This will be explained in more detail later.

[0147] In addition, such as Figure 9 As shown, the welding slot 51f in the sixth implementation example can be formed by cutting a portion of the outer side of the filter tuning cover 30.

[0148] At this point, the cutting range of the welding slot 51f in the sixth implementation example is such that it cuts a portion of the surface of the guide nut 32 that contacts the filter tuning cover 30, and is cut at least further radially than the outer surface of the guide nut 32, so that the solder material 55 can be easily inserted and coated.

[0149] Although not shown in the accompanying drawings, the welding slot 51f of the sixth embodiment may be inclined downward toward the tuning screw 31 to form a bottom surface so that the molten solder material 55 can easily flow in the direction of gravity.

[0150] Figure 10 The diagram shows a cross-sectional view (a) and a plan view (b) of 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 a portion of the structure (guide nut). Figure 11 This is a cross-sectional view illustrating the locking process of the guide nut of a filter for a communication device according to another embodiment of the present invention.

[0151] like Figure 10 and Figure 11 As shown, the filter 1 for a communication device according to another embodiment of the present invention is based on the premise that the screw mounting hole 35 is formed to include a mounting boss 35a, and the guide nut 32 also has a boss receiving portion 32a surrounding the mounting boss 35a.

[0152] Here, the outer peripheral surface of the mounting boss 35a may include an inner tapered portion 35-2, which gradually narrows in diameter towards the outer end (i.e., away from the outer side of the filter tuning cover 30). The inner peripheral surface of the boss receiving portion 32a of the guide nut 32 may include an outer tapered portion 32a-2, which is formed to have an inclination angle corresponding to the inner tapered portion 35-2 of the mounting boss 35a.

[0153] like Figure 11 According to the filter 1 for a communication device according to another embodiment of the present invention as described above, when the frequency is adjusted by the tuning screw 31 and the tuning screw 31 is locked to the mounting boss 35a by the guide nut 32 (or temporarily fixed), the stronger the locking force of the guide nut 32, the tighter the outer tapered portion 32a-2 of the guide nut is against the inner tapered portion 35-2 of the mounting boss 35a, and the greater the force that pushes the mounting boss 35a toward the tuning screw 31, thus reducing the gap between the outer peripheral surface of the tuning screw 31 and the inner peripheral surface (female thread 35-1 of the boss) of the mounting boss 35a.

[0154] As described above, the filter 1 for communication devices according to the present invention is formed by making the screw mounting hole 35 include a mounting boss 35a instead of a simple hole shape, thereby allowing the filter tuning cover 30 to be manufactured with a thinner material, thus reducing the weight of the product and providing the additional advantage of saving manufacturing costs.

[0155] Figure 12 This is a cross-sectional view showing the fine adjustment (tuning) of a filter in a communication device according to an embodiment of the present invention after the tuning screw is fixed. Figure 13 It is shown Figure 3 Cross-sectional and plan views of various embodiments of the groove portion of the filter tuning cover in the structure; Figure 14 These are cross-sectional and plan views showing a modified example of the groove portion of the filter tuning cover when a guide nut without a separately configured boss receiving portion is used. Figure 15 It is applicable Figure 3 Plan view and cross-sectional view of another example of the mounting boss in the structure.

[0156] Typically, a fixed-frequency filter, such as a filter 1 for a communication device according to an embodiment of the present invention, is preferably fixed by adjusting the frequency according to the frequency characteristics in each cavity C using a tuning screw 31, and then fixing it to prevent arbitrary physical movement (activity) due to external force.

[0157] However, frequency adjustment is not limited to a one-time adjustment using the tuning screw 31. Further frequency adjustments (hereinafter referred to as "fine frequency adjustments") may be required depending on the installation location, position, and required frequency characteristics of the antenna device.

[0158] However, as Figure 12 As shown, if the frequency is adjusted using the tuning screw 31 and then the solder material 55 is used to completely fill the gap of the filter tuning cover 30 against the screw mounting hole 35 for fixing, the tuning screw 31 can no longer be rotated, so it may be difficult to make further fine frequency adjustments.

[0159] However, in the case of the filter 1 for a communication device according to an embodiment of the present invention, the filter tuning cover 30 can be manufactured using a relatively thin material. Therefore, after fixing the tuning screw 31 to the filter tuning cover 30, as... Figure 12 As shown, fine frequency adjustments can also be made along the rotation direction of the tuning screw 31.

[0160] More specifically, even after the tuning screw 31 is soldered and fixed to the screw mounting hole 35 of the filter tuning cover 30 using solder material 55, and the guide nut 32 can be forcibly rotated to one side or the other, the tuning screw 31 does not actually rotate. Instead, by using a rotational force provided by a person (designer), the filter tuning cover 30 is slightly pulled upwards or pushed downwards, corresponding to the inner part of the boss receiving portion 32a of the guide nut 32, thus moving the tuning screw 31 up and down. Within this minute range of movement, considerable frequency tuning can be performed. The process of fine frequency adjustment through the slight movement of the filter tuning cover 30 will be explained in more detail later.

[0161] On the other hand, such as Figure 13 As shown, when the filter tuning cover 30 is relatively thick, an upper tuning groove 37a can be formed on the upper surface of the filter tuning cover 30 corresponding to the periphery of the screw mounting hole 35 to accommodate a portion of the lower end of the boss receiving portion 32a. Furthermore, a lower tuning groove 37b can be formed on the lower surface of the filter tuning cover 30 corresponding to the lower end of the boss receiving portion 32a.

[0162] When the upper tuning slot 37a or the lower tuning slot 37b, as described above, is additionally formed on the upper or lower surface of the filter tuning cover 30, fine frequency tuning can be performed by slightly deforming the corresponding slot (37a or 37b) through the rotational force transmitted to the tuning screw 31.

[0163] The aforementioned upper tuning groove 37a and lower tuning groove 37b are based on the premise that the guide nut 32 has a boss receiving portion 32a.

[0164] Conversely, refer to Figure 14 In the modified example, the upper tuning groove 37c is formed around the screw mounting hole 35 of the filter tuning cover 30, in the case where the guide nut 32 does not have a separate boss receiving portion, and can be formed such that the maximum radius is smaller than the interval distance from the center of the screw mounting hole 35 to the outer side of the guide nut 32.

[0165] In addition, in the modified example, the upper tuning groove 37c may have a stepped portion 37c-1 formed in the periphery of the screw mounting hole 35, which is less than the depth of the upper tuning groove 37c, to ensure that there is enough range for tightening with the male thread 31-1 of the tuning screw 31.

[0166] As described above, in the modified example where the upper tuning groove 37c also forms a stepped portion 37c-1, sufficient thread tightening range of the tuning screw 31 is ensured. Therefore, if the guide nut 32 is rotated to one side or the other side after fixing by welding with solder material applied to the welding slot 50, the tuning screw 31 is moved by being pulled up or pushed down, thereby achieving the advantage of stable additional fine frequency readjustment.

[0167] More specifically, refer to Figure 14 If solder material 55 is applied through the welding slot 50 of the guide nut 32 and then left in a high-temperature environment (or high-frequency environment) for a predetermined time, the solder material 55 will melt and penetrate into the gap between the male thread 31-1 formed on the outer peripheral surface of the tuning screw 31 and the female thread 35-1 of the boss of the screw mounting hole 35 in a welding manner, and at the same time solidify, the tuning screw 31 is fixed to the filter tuning cover 30 by this action.

[0168] Then, if the frequency characteristics are readjusted, the designer rotates the guide nut 32 in place in one direction or the other direction. The lower end face of the guide nut 32 supports the outer side of the filter tuning cover 30. At the same time, the inner part of the lower end face of the guide nut 32, which is relatively thinner than the filter tuning cover 30, or the part corresponding to the upper tuning groove 37c in the modified example, is deformed so that the guide nut 32 is pulled upward or pushed downward (cavity C side) in the drawing along the rotation direction of the tuning screw 31.

[0169] In this modified example, when the upper tuning slot 37c is deformed upwards, 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. Conversely, when the upper tuning slot 37c is deformed downwards, 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 reduced.

[0170] On the other hand, such as Figure 13 As shown, according to an embodiment of the present invention, the filter 1 for a communication device may further include additional space steps 32c-1 and 32c-2 at at least any one of the upper and lower ends of the guide nut 32, so that a portion including the welding slot 50 is cut into a step shape.

[0171] The additional space steps 32c-1 and 32c-2 serve to ensure that the additional space is filled with a sufficient amount of solder material 55 when solder material is applied through the welding slot 50.

[0172] However, the additional space steps 32c-1 and 32c-2 do not necessarily have to be cut into a step shape, but can of course be formed into an inclined shape within the limit of ensuring sufficient space.

[0173] At the same time, such as Figure 3 As shown, the filter 1 for a communication device according to an embodiment of the present invention is described in terms of a mounting boss 35a protruding outward from the outer side of the filter tuning cover 30, but the formation of the mounting boss 35a is not necessarily limited to this.

[0174] If, as in reference Figure 15 As shown in another example, the mounting boss 35a can be formed by making the inner side frame end of the screw mounting hole 35 of the filter tuning cover 30 protrude into the cavity C by means of flanging and tapping.

[0175] The inner circumferential surface of the mounting boss 35a here may also form a female boss thread 35-1, which is fastened to the male thread 31-1 formed on the outer circumferential surface of the tuning screw 31.

[0176] The mounting boss 35a in another example described above also compensates for the disadvantage of the slightly thinner filter tuning cover 30, so that the boss female thread 35-1 can be easily formed inside the screw mounting hole 35, and a thinner filter tuning cover 30 can be used, thus providing the advantage of significantly reducing the overall weight of the product.

[0177] Figure 16a and Figure 16b As another embodiment of the present invention, cross-sectional views (a), plan views (b), and side views (c) are shown, illustrating various implementations of the guide elastomer in the screw retaining member; Figure 17 As another embodiment of the present invention, a perspective view is shown of a U-shaped nut clip in a screw retaining component.

[0178] In the filter 1 for communication devices according to the present invention, the screw retaining components 32, 132, 232, 332 may include guide elastomers 132, 232, one end of which is supported on the outer side of the filter tuning cover 30, and the other end is at least screwed into the male thread 31-1 formed on the outer peripheral surface of the plurality of tuning screws 31.

[0179] Here, as Figure 16a As shown, the guide elastomers 132 and 232 can be leaf spring components 132 with a predetermined thickness.

[0180] like Figure 16a As shown, in the leaf spring component 132, one end 132B that is in close contact with the outer side of the filter tuning cover 30 can be formed as a circle. Moreover, although not shown in the figure, it can be formed as a press-fit nut shape with a nut shape.

[0181] At this time, in the leaf spring component 132, the other end 132A of the male thread 31-1 of the plurality of tuning screws 31 can be formed to have a thickness T1 that is smaller than the pitch P of the male thread 31-1 of the plurality of tuning screws 31, so as to facilitate the helical engagement.

[0182] The leaf spring component 132 described above can be made of either a plastic sheet or a metal sheet.

[0183] On the other hand, such as Figure 16b As shown, the guiding elastomers 132 and 232 can be spring components 232 whose diameter gradually decreases from one end 232B to the other end 232A.

[0184] Here, as Figure 16b As shown, the other end 232A of the spring component 232, which is helically engaged with the male thread 31-1 of the multiple tuning screws 31, can be formed into a circular cross-section with a diameter T2 smaller than the pitch P of the multiple tuning screws 31.

[0185] Solder material 55 can be inserted and coated through the gap between one end 132B, 232B and the other end 132A, 232A of each of the leaf spring component 132 and spring component 232 as described above, and multiple tuning screws 31 are welded to the screw mounting holes 35 of the filter tuning cover 30.

[0186] On the other hand, such as Figure 17 As shown, screw retaining components 32, 132, 232, and 332 may include a U-shaped nut clip 332 that engages with a portion of the tuning screw 31 exposed on the outside of the filter tuning cover 30 in the screw mounting hole 35 of the filter tuning cover 30, to temporarily secure the tuning screw 31.

[0187] Here, as Figure 17 As shown, the U-shaped nut clip 332 may include a support panel portion 332A and an elastic panel portion 332B. The support panel portion 332A is supported on the outer side of the filter tuning cover 30 and has a through portion (not shown) for the tuning screw 31 exposed on the outer side of the filter tuning cover 30 to pass through. The elastic panel portion 332B is elastically bent into a U-shape relative to the support panel portion 332A and has a threaded engagement boss 332C. The threaded engagement boss 332C is threadedly engaged with a portion of the outer peripheral surface of the tuning screw 31 that passes through the support panel portion 332A.

[0188] At this time, solder material 55 can be inserted between the support panel portion 332A and the elastic panel portion 332B to weld a plurality of tuning screws 31 to the screw mounting holes 35 of the filter tuning cover 30 through the through portion of the support panel portion 332A.

[0189] As described above, the filter 1 for communication devices according to the present invention, as screw holding components 32, 132, 232, 332, can not only adopt the guide nut 32 of the thin filter tuning cover 30 which is easy to finely adjust the frequency, but can also be deformed and replaced by the guide elastomers 132, 232 and U-shaped nut clips 332, so that the tuning screw 31 can be easily temporarily fixed to the filter tuning cover 30.

[0190] Figure 18a and Figure 18b As Figure 3 The modified example of the guide nut is a modified example of temporarily fixing the solder material without welding slots.

[0191] In the communication device filter 1 according to the present invention as described above, the modified examples 51a to 51f of the welding slot are formed by cutting on the guide nut 32, the tuning screw 31 and the filter tuning cover 30 respectively, so as to facilitate the application of solder material 55.

[0192] However, it is not necessary to apply solder material 55 through the above-mentioned welding slot modifications 51a to 51f after installing the tuning screw 31 into the screw mounting hole 35. Rather, as a modification of the guide nut 32, solder material 55a and 55b can be applied without the welding slot modifications 51a to 51f.

[0193] More specifically, such as Figure 18a and Figure 18b As shown, solder placement portions 32d-1 and 32d-2 for placing solder materials 55a and 55b can be formed inside the boss receiving portion 32a of the guide nut 32.

[0194] Here, the solder placement portions 32d-1 and 32d-2 can be constructed from the first implementation example 32d-1, having a cross-section that slopes downward in the radial direction toward the outer peripheral surface of the tuning screw 31.

[0195] As described above, according to the solder placement part 32d-1 implemented by the first embodiment, before locking with the guide nut 32, solder material 55a is pre-attached to the inclined cross-section. After locking the tuning screw 31, it is exposed to a high temperature environment. The molten solder material 55a flows along the inclined cross-section to the outer peripheral surface of the tuning screw 31 and then enters the screw mounting hole 35 of the filter tuning cover 30 for solidification. Through this action, the tuning screw 31 can be welded and fixed.

[0196] On the other hand, the solder placement parts 32d-1 and 32d-2 can be constructed by the second implementation example 32d-2, having a groove shape to insert and install solder material 55b (solder ring) formed with a circular cross section.

[0197] At this time, the female thread 32-1 (boss female thread) of the guide nut 32, which constitutes part of the above-mentioned groove formation, is formed inclined downward toward the outer peripheral surface of the tuning screw 31. As a result, the solder material 55b molten on the inner side of the groove formation flows along the inclined female thread 32-1 and can easily enter the screw mounting hole 35 side of the filter tuning cover 30 for solidification. Through this action, the tuning screw 31 can be welded and fixed.

[0198] Figure 19 This is a cross-sectional view showing the fine frequency adjustment after the tuning screw is fixed by welding a guide nut.

[0199] like Figure 19 As shown, a filter 1 for a communication device according to another embodiment of the present invention includes a screw retaining member ( Figure 19 The guide nut 32) is located on the outside of the filter tuning cover 30 and forms a movement space S between it and the filter tuning cover 30 for a plurality of tuning screws 31 to move the plurality of tuning screws 31 by external force transmitted by the plurality of tuning screws 31 fixed to the filter tuning cover 30.

[0200] Here, the screw retaining member 32 forms the aforementioned moving space S between itself and the filter tuning cover 30, thus allowing for fine frequency adjustments.

[0201] More specifically, the screw retaining component 32 performs the function of temporarily fixing a plurality of tuning screws 31 in the screw mounting holes 35 of the filter tuning cover 30, while also serving as a medium for transmitting external force for movement of the tuning screws 31 welded to the filter tuning cover 30.

[0202] Here, if the screw retaining member configured to guide the nut 32 is rotated in one direction, then as Figure 19 As shown in (c), the tuning screw 31 and a portion of the filter tuning cover 30 with screw mounting holes 35 are moved slightly upward toward the moving space S by the threaded engagement between the female thread 32-1 of the guide nut 32 and the male thread 31-1 of the tuning screw 31.

[0203] In the case of the filter 1 for the communication device according to another embodiment of the present invention, only the fine frequency adjustment process of moving the tuning screw 31 upward toward the moving space S is shown and explained. However, it is of course possible to make fine frequency adjustments by moving the guide nut 32 downward in the direction opposite to the moving space S along the rotation direction of the guide nut 32.

[0204] The filter for a communication device according to an embodiment of the present invention has been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not necessarily limited to the above-described embodiments, but can certainly be modified and implemented by those skilled in the art to which this invention pertains in various ways. Therefore, the true scope of the claims should be determined by the scope of the claims.

Claims

1. A filter for a communication device, comprising: The filter body has at least one cavity formed inside as a predetermined space, and is open on one side; The filter tuning cover is configured to cover one side of the opening of the filter body and has a plurality of screw mounting holes. Multiple tuning screws, each secured in a plurality of screw mounting holes, perform fine frequency adjustments by adjusting the spacing between the screws and the front ends of the resonators disposed within the cavity; and The screw retaining component temporarily secures the plurality of tuning screws to the filter tuning cover before the fine frequency tuning is performed by deforming a portion of the filter tuning cover using the plurality of tuning screws.

2. The filter for communication equipment according to claim 1, characterized in that, The screw retaining component includes a guide nut that intervenes in a screw mounting hole for the filter tuning cover to temporarily secure the tuning screw.

3. The filter for communication equipment according to claim 2, characterized in that, At least one solder paste application slot (hereinafter referred to as "soldering slot") is formed in any one of the plurality of tuning screws and the guide nut, and solder material is inserted into the soldering slot for soldering the plurality of tuning screws into the screw mounting hole after the frequencies are tuned by the plurality of tuning screws respectively.

4. The filter for communication equipment according to claim 3, characterized in that, The welding slot is formed in the guide nut and is formed by removing at least a portion of the female thread of the nut, the female thread of the nut being fastened to the male thread formed on the outer peripheral surface of the tuning screw.

5. The filter for communication equipment according to claim 3, characterized in that, The welding slot is formed in the guide nut and is formed by removing a portion of the end that contacts the filter tuning cover in the radial direction.

6. The filter for communication equipment according to claim 3, characterized in that, The screw mounting hole includes a mounting boss that protrudes a predetermined length outward from the filter tuning cover. A female thread is formed on the inner circumferential surface of the mounting boss, and the female thread is fastened to the male thread formed on the outer circumferential surface of the tuning screw.

7. The filter for communication equipment according to claim 6, characterized in that, The female thread of the mounting boss is made by using a flanging and tapping method for the filter tuning cover.

8. The filter for communication equipment according to claim 6, characterized in that, The guide nut includes: The boss receiving portion is configured to surround the mounting boss of the screw mounting hole; and The screw fastening part has a nut female thread forming a male thread for fastening the tuning screw on its inner circumferential surface; The welding slot is formed by removing the female thread of the nut from the fastening part of the screw in the tightening direction of the tuning screw.

9. The filter for communication equipment according to claim 6, characterized in that, The guide nut includes: The boss receiving portion is configured to surround the mounting boss of the screw mounting hole; and The screw fastening part has a nut female thread forming a male thread for fastening the tuning screw on its inner circumferential surface; The welding slot is formed by cutting a portion of the guide nut, including the boss receiving portion and the screw fastening portion, to expose the tuning screw from the outer end to the inner end.

10. The filter for communication equipment according to claim 8 or 9, characterized in that, The outer peripheral surface of the mounting boss includes an inner tapered portion, the inner tapered portion having a diameter that gradually decreases towards the outer end; The inner circumferential surface of the boss receiving portion of the guide nut includes an outer tapered portion, which is formed to have an inclination angle corresponding to the inner tapered portion of the mounting boss.

11. The filter for communication equipment according to claim 8 or 9, characterized in that, An upper tuning groove or a lower tuning groove is formed on the outer or inner side of the filter tuning cover corresponding to the end of the boss receiving portion of the guide nut, with a thickness less than that of the filter tuning cover.

12. The filter for communication equipment according to claim 3, characterized in that, The welding slot is formed on the tuning screw and is formed by removing at least a portion of the male thread formed on the outer peripheral surface of the tuning screw.

13. The filter for communication equipment according to claim 12, characterized in that, The welding slot is formed in a straight line with respect to the tightening direction of the screw mounting hole.

14. The filter for communication equipment according to claim 3, characterized in that, The welding slot is formed on the tuning screw and is cut to a predetermined length from the upper center of the tuning screw to the lower end side, and is cut to communicate with the screw mounting hole side.

15. The filter for communication equipment according to claim 3, characterized in that, An additional space step is formed at at least one of the upper and lower ends of the guide nut to cut a portion of the welding slot in a stepped manner.

16. The filter for communication equipment according to claim 3, characterized in that, After the tuning screw and the filter tuning cover are fixed by welding through the welding slot, the fine frequency adjustment is performed according to the rotation direction of the guide nut.

17. The filter for communication equipment according to claim 3, characterized in that, An upper tuning groove is also formed on the outer side of the filter tuning cover, and the upper tuning groove is formed such that the maximum radius is smaller than the interval distance from the center of the screw mounting hole to the outer side of the guide nut; In the upper tuning groove, a step is formed around the screw mounting hole, such that the step is smaller than the depth of the upper tuning groove.

18. The filter for communication equipment according to claim 3, characterized in that, When the filter body and the filter tuning cover are made of aluminum or aluminum alloy. The guide nut is made of the same material as the filter body and the filter tuning cover, both of which have higher high-frequency reactivity than aluminum or aluminum alloy.

19. The filter for communication equipment according to claim 3, characterized in that, The screw mounting hole includes a mounting boss, which is formed such that the inner side frame end protrudes into the cavity by a flanging and tapping method. A female thread is formed on the inner circumferential surface of the mounting boss to fasten the male thread formed on the outer circumferential surface of the tuning screw.

20. The filter for communication equipment according to claim 8 or 9, characterized in that, A solder placement portion for placing the solder material is formed on the inner side of the boss receiving portion of the guide nut.

21. The filter for communication equipment according to claim 20, characterized in that, The solder placement portion is formed with a cross-section that slopes downward in a radial direction toward the outer peripheral surface of the tuning screw.

22. The filter for communication equipment according to claim 20, characterized in that, The solder placement section is formed with grooves to insert and install a solder ring with a circular cross-section.

23. The filter for communication equipment according to claim 1, characterized in that, The screw retaining component includes a guide elastomer, one end of which is supported on the outer side of the filter tuning cover, and the other end is at least helically engaged with a male thread formed on the outer peripheral surface of the plurality of tuning screws.

24. The filter for communication equipment according to claim 23, characterized in that, The guiding elastomer is a leaf spring component with a predetermined thickness.

25. The filter for communication equipment according to claim 24, characterized in that, The other end of the leaf spring component, which is helically engaged with the male threads of the plurality of tuning screws, is formed with a thickness smaller than the pitch of the male threads of the plurality of tuning screws.

26. The filter for communication equipment according to claim 24, characterized in that, The leaf spring component is made of either plastic sheet or metal sheet.

27. The filter for communication equipment according to claim 23, characterized in that, The guiding elastomer is a spring component whose diameter gradually decreases from one end to the other end.

28. The filter for communication equipment according to claim 27, characterized in that, At the other end of the spring component, which is helically engaged with the male threads of the plurality of tuning screws, a circular cross-section is formed having a pitch smaller than that of the male threads of the plurality of tuning screws.

29. The filter for communication equipment according to claim 24 or 27, characterized in that, Solder material is inserted through the gap between one end and the other end of each of the leaf spring component and the spring component to weld the plurality of tuning screws to the screw mounting holes of the filter tuning cover.

30. The filter for communication equipment according to claim 1, characterized in that, The screw retaining component includes a U-shaped nut clamp. The U-shaped nut clip engages with the portion of the tuning screw exposed on the outside of the filter tuning cover in the screw mounting hole of the filter tuning cover, thereby intervening in the temporary fixation of the tuning screw.

31. The filter for communication equipment according to claim 30, characterized in that, The U-shaped nut clamp includes: The support panel is supported on the outer side of the filter tuning cover and has a through portion for the tuning screw exposed on the outer side of the filter tuning cover to pass through; and The elastic panel portion is elastically bent into a U-shape relative to the support panel portion and has a threaded engagement boss, which is threadedly engaged with a portion of the outer peripheral surface of the tuning screw that passes through the support panel portion.

32. The filter for communication equipment according to claim 30, characterized in that, Solder material is inserted between the support panel and the elastic panel to weld the plurality of tuning screws to the screw mounting holes of the filter tuning cover through the through portion of the support panel.

33. A filter for a communication device, comprising: The filter body has at least one cavity formed inside as a predetermined space, and is open on one side; A filter tuning cover is configured to cover one side of the opening of the filter body and has a plurality of screw mounting holes; Multiple tuning screws are respectively fastened to the multiple screw mounting holes; and A screw retaining component is disposed on the outside of the filter tuning cover and forms a moving space between itself and the filter tuning cover for the plurality of tuning screws, which are moved by an external force transmitted by the plurality of tuning screws fixed to the filter tuning cover.

Images