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, the filter comprising: a filter body provided with a cavity as a dielectric filling space, the bottom of the cavity being open; a lower cover plate made of a first material coupled to the filter main body so as to cover the bottom of the opening of the filter main body; and a resonator frame of a second material coupled to the lower cover plate and provided with a plurality of resonator bars extending a predetermined length toward the upper surface of the filter body, the resonator frame being formed on the lower cover plate so as to pass through the inside and outside of the cavity. After the lower end part is forcibly buckled and combined with more than two rows of buckling through holes arranged in the width direction in a manner of being separated along the length direction, the peripheries of the plurality of buckling through holes are fixed on the inner side of the cavity through soldering combination, so that the insertion loss amount in the cavity can be minimized.

Description

Technical Field

[0001] The present invention relates to a filter for a communication device, and more particularly to a filter for a communication device, which, after manufacturing a filter body for forming a cavity through a deep drawing process, forcibly snaps and combines a resonator frame of a different material to a lower cover plate of the same material on one side that shields the opening of the cavity, and then minimizes the insertion loss in the cavity through soldering. Background Art

[0002] Radio frequency devices such as radio frequency filters (including all "communication devices") are generally composed of a connection structure of multiple resonators. Such a resonator is a circuit device that resonates at a specific frequency equivalently by an electronic circuit through a combination of an inductor L and a capacitor C, and each resonator has a structure in which a dielectric resonance device (DR) or a metal resonance device is provided inside a cavity such as a metallic cylinder or a rectangular parallelepiped surrounded by a conductor. Therefore, each resonator has a structure that can achieve high-frequency resonance by having only an electromagnetic field of an inherent frequency based on a processing frequency band in the corresponding cavity. Generally, a multi-terminal structure is formed in which multiple cavities form multiple resonance terminals and the multiple resonance terminals are connected in sequence.

[0003] An example related to a radio frequency filter having a multiple cavity structure is the content disclosed in Korean Patent Publication No. 10-2004-0100084 (title: "Radio Frequency Filter", publication date: December 02, 2004) previously applied for by the applicant of this case.

[0004] However, in the existing radio frequency filter, each resonator extends in the thickness direction inside the cavity, and a part of the filter tuning cover that covers the cavity in a manner having a required bandpass and characteristics is deformed by stamping to adjust the distance from the resonator and thereby tune the frequency, and there is a problem of limitation in reducing the size in the thickness direction of the completed filter.

[0005] Also, in the existing radio frequency filter, in order to strengthen the skirt characteristics between adjacent resonators or between separated resonators in multiple cavities, it is necessary to provide an additional structure of a conductor material to exhibit inductive coupling or capacitive coupling, and a problem is that the weight of the completed filter is greatly increased.

[0006] On the other hand, recently, in antenna devices adopting the Massive MIMO (Multiple In-put Multiple Out-put) technology, in order to achieve the ultra-thin manufacturing of the entire product, research is being carried out in the direction of minimizing the thickness of internal structures such as filters. For this purpose, the most commonly used type of filter can be a dielectric ceramic filter.

[0007] However, due to the characteristics of the material of the dielectric ceramic filter, the manufacturing method of the filter body is limited to the molding method, which results in a decrease in productivity. On the other hand, the shape of the cavity needs to be pre-manufactured according to the final frequency design value, which has the problem of poor variability in subsequent frequency tuning design.

[0008] On the other hand, in the case of using a copper plate as the material of the filter, the above-mentioned decrease in productivity can be prevented by adopting various manufacturing methods such as the stamping template method. Although there are such advantages, when the materials of the filter body and the resonator, which is the resonance factor provided inside its cavity, are different, during their bonding process, the problem of a large rod insertion loss in the welding method will occur. Summary of the Invention

[0009] Technical Problem

[0010] The present invention is used to solve the above-mentioned technical problems, and its purpose is to provide a filter for a communication device as follows: after manufacturing a filter body for forming a cavity through a deep drawing process, a lower cover plate of the same material on the side covering the opening of the cavity is forcibly snapped and combined with a resonator frame of a different material, and then the insertion loss in the cavity is minimized through soldering.

[0011] Technical Solution

[0012] The filter for a communication device according to an embodiment of the present invention includes: a filter body provided with a cavity as a dielectric filling space, the bottom of the cavity being open; a lower cover plate of a first material combined in a manner to cover the bottom of the opening of the filter body; and a resonator frame of a second material combined with the lower cover plate, provided with a plurality of resonance rods extending a predetermined length toward the upper surface of the filter body. The resonator frame is formed on the lower cover plate in a manner to penetrate the inside and outside of the cavity. After the lower end is forcibly snapped and combined with a plurality of snap-through holes arranged in two or more columns in the width direction at intervals along the length direction, the peripheries of the plurality of snap-through holes are fixed by soldering inside the cavity.

[0013] Among them, the above resonator frame can be set in a manner corresponding to the number of columns of the plurality of snap-through holes formed in the above lower cover plate, and the plurality of resonator rods can be arranged at a predetermined distance along the length direction of the filter body in a manner that they do not overlap each other in the width direction of the filter body.

[0014] Moreover, a notch forming portion can be provided on the above resonator frame, and the notch forming portion is formed with notch rods that extend a predetermined distance from the side portions of the resonator rods on both sides of one of the plurality of resonator rods arranged in sequence along the length direction of the filter body in a direction orthogonal to the direction in which they are located.

[0015] Furthermore, the above notch forming portion can include: a C-shaped notch portion where the notch rods are not connected to each other; and an L-shaped notch portion where the notch rods are connected to each other. Compared with the above L-shaped notch portion, the C-shaped notch portion can form the notch rods at a position closer to the upper surface of the filter body among the plurality of resonator rods.

[0016] In addition, the above filter body and the lower cover plate are made of the same material. The first material can be copper, and the second material can be a conductive material other than the above copper material.

[0017] Moreover, a plurality of tuning scribing surfaces can be provided on the upper surface of the filter body, respectively located at positions corresponding to directly above the plurality of resonator rods, and the fine frequency can be adjusted by scribing to adjust the separation distance between the plurality of resonator rods.

[0018] In addition, the thickness of the above plurality of tuning scribing surfaces can be smaller than the thickness of the upper surface of the filter body, and both ends in the length direction can be integrally formed and connected to the upper surface of the filter body, and both ends in the width direction can be cut and formed on the upper surface of the filter body.

[0019] Moreover, a plurality of coupling adjustment surfaces can be provided on the upper surface of the filter body, respectively provided at positions corresponding to between adjacent resonator rods among the plurality of resonator rods, and the coupling value between the adjacent resonator rods can be changed by scribing to cause the inner shape of the cavity to deform and protrude.

[0020] In addition, the thickness of the above plurality of coupling adjustment surfaces can be smaller than the thickness of the upper surface of the filter body, and one of both ends in the length direction and both ends in the width direction can be cut and formed on the upper surface of the filter body.

[0021] Furthermore, the above filter body can be manufactured by a deep drawing method in a manner that forms a joint portion in contact with the edge end surface of the above lower cover plate.

[0022] Furthermore, the resonator frame described above includes: a plurality of resonator rods arranged in two columns in the width direction of the cavity, side by side along the length direction and separated by a predetermined distance; a resonator connecting rod formed with resonator coupling ends respectively inserted into a plurality of snap-through holes of the lower cover plate; and a resonance characteristic end formed at the front ends of the plurality of resonator rods, and the lower ends of the resonator coupling ends exposed to the outside are soldered by passing through the plurality of snap-through holes of the lower cover plate from the outside of the lower cover plate.

[0023] Effects of the Invention

[0024] The filter for a communication device according to an embodiment of the present invention can combine a resonator frame, which is a structure inside the cavity and made of a different material from the filter body, with a minimum insertion loss amount, thereby having the effect of improving the reliability of the communication device. Brief Description of the Drawings

[0025] Figure 1 It is a top perspective view of a filter for a communication device according to an embodiment of the present invention.

[0026] Figure 2 It is Figure 1 the bottom perspective view of

[0027] Figure 3 It is Figure 1 the exploded perspective view of

[0028] Figure 4 It is Figure 2 the exploded perspective view of

[0029] Figure 5 It is a cutaway perspective view partially cut in such a way as to show the cavity in the structure of Figure 1

[0030] Figure 6 It is a vertical cross-sectional view taken along line A-A in Figure 1 and a partial enlarged view showing the bonding form of the mounting plate and the lower cover plate of the filter body and the bonding form of the lower cover plate and the resonator frame in its structure.

[0031] Figure 7 It is Figure 1 the horizontal cross-sectional view taken along line B-B in

[0032] Figure 8 It is Figure 1 the vertical cross-sectional view taken along line A-A in

[0033] Figure 9 It is Figure 1 ​A vertical sectional view taken along line A-A in and a partially enlarged view showing the tuned scoring surface in its structure.

[0034] Figure 10 Part (a) of Figure 1 is the top view of Figure 10 Part (b) of Figure 10 is the top view of the resonator frame,

[0035] Description of reference numerals

[0036] 100: Filter for communication equipment 105: Filter body

[0037] 110: Mounting edge plate 120: One-side thickness forming plate

[0038] 130: The other-side thickness forming plate 150: Body upper forming plate

[0039] 180A: One-side shielding plate 180B: The other-side shielding plate

[0040] 200: Resonator frame 210: Resonator connecting rod

[0041] 215: Resonator coupling end 220: Resonator rod

[0042] 230: Resonant characteristic end 300: Lower cover plate

[0043] 310h: Snap-in through hole Detailed implementation mode

[0044] Hereinafter, a filter for a communication device according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0045] In the process of assigning reference numerals to a plurality of structural elements in each drawing, the same reference numerals are assigned to the same structural elements as much as possible even if they appear in different drawings. Moreover, in the process of describing an embodiment of the present invention, if it is determined that a detailed description of a related well-known structure or function may impede the understanding of the embodiment of the present invention, its detailed description is omitted.

[0046] In the process of describing the structural elements in the embodiments of the present invention, terms such as "first", "second", "A", "B", "a", "b", etc. may be used. These terms are only used to distinguish the corresponding structural elements from other structural elements, and the essence, order or sequence, etc. of the corresponding structural elements are not limited by their terms. Also, unless otherwise defined, the meanings of all terms used in this specification, including technical terms or scientific and technical terms, are the same as those generally understood by those of ordinary skill in the technical field to which the present invention belongs. Terms with the same meaning as the commonly used meaning and the meaning in the dictionary should be interpreted as having the same meaning as their meaning in the relevant technology context. If not clearly defined in this application, they are not interpreted as idealized or overly formalized meanings.

[0047] Figure 1 The top perspective view of the filter for a communication device according to an embodiment of the present invention Figure 2 is Figure 1 the bottom perspective view of Figure 3 is Figure 1 the exploded perspective view of Figure 4 is Figure 2 the exploded perspective view of Figure 5 is the sectional perspective view partially cut in such a way as to expose the cavity in the structure of Figure 1

[0048] As Figures 1 to 5 shown, the filter for a communication device according to an embodiment of the present invention includes: a filter main body 105 provided with a cavity C as a dielectric filling space, the bottom of the cavity C being open; a lower cover plate 300 combined in such a way as to cover the bottom of the cavity C of the filter main body 105 with an opening; and a resonator frame 200 combined with the lower cover plate 300 and provided with a plurality of resonator rods 220 extending a predetermined length upward in the cavity C of the filter main body 105.

[0049] Among them, the filter main body 105 and the lower cover plate 300 that actually form the inner surface of the cavity C may be formed of metal plate members of the same first material. And the first material of the filter main body 105 and the lower cover plate 300 adopted as metal plate members may be copper material with excellent conductivity.

[0050] As Figures 1 to 5 ​As shown, the filter body 105 may include: a mounting edge plate 110 formed by orthogonally bending and extending at the bottom edge end of the cavity C of the open filter body 105 to the outside; a one-side thickness forming plate 120 and a the other-side thickness forming plate 130, which are formed by extending along the thickness direction of the cavity C as the one-end and the other-end in the width direction of the cavity C; a main body upper forming plate 150 for forming the upper part of the cavity C; and a one-side shielding plate 180A and a the other-side shielding plate 180B for shielding the open parts on the one-side and the other-side in the length direction of the cavity C.

[0051] Hereinafter, terms related to "direction" and "position" described in the detailed description part of the present invention may be defined as follows to more clearly understand the filter 100 for a communication device according to an embodiment of the present invention.

[0052] That is, the "length direction" is the direction passing through between two ends with a relatively larger length than the width or thickness, and may be defined as the direction orthogonal to the one-side shielding plate 180A and the other-side shielding plate 180B. The "width direction" may be defined as the direction orthogonal to the one-side thickness forming plate 120 and the other-side thickness forming plate 130. The "thickness direction" may be defined as the direction orthogonal to the main body upper forming plate 150 and the lower cover plate 300.

[0053] On the other hand, the size of the lower cover plate 300 corresponds to the size of the edge end of the mounting edge plate 110 in the structure of the filter body 105, and they may be combined by the way that the edge end of the lower cover plate 300 is surface-joined with the edge end of the mounting edge plate 110.

[0054] More specifically, the lower surface of the mounting edge plate 110 forming the edge end of the filter body 105 may be surface-joined with the upper surface of the edge end of the lower cover plate 300.

[0055] In this case, the surface-joining manner of the mounting edge plate 110 of the filter body 105 and the edge end of the lower cover plate 300 may be achieved by welding, and preferably, solder bonding may be achieved by the SMT method.

[0056] Among them, assuming that the above filter body 105 and the lower cover plate 300 are manufactured by a stamping method based on a plate mold, the cavity C extends along the left-right length direction, and a rectangular parallelepiped shape with a front-back width smaller than the up-down height may be formed.

[0057] When a plurality of filter bodies 105 each having a cavity C of this shape are arranged in an antenna cover body (not shown) in the shape of a box with an opening at the front, a plate 150 formed on the upper part of the body forms the front surface. When arranged in such a way that a plate 120 with one-side thickness and a plate 130 with the other-side thickness form the left and right side surfaces, there is an advantage that a large number of filter bodies 105 can be arranged in many columns along the left and right directions in the installation space of the antenna cover body.

[0058] Moreover, in the installation space of the antenna cover body, they are arranged in such a way that the plate 150 formed on the upper part of the body and the lower cover plate 300 respectively form the left and right side surfaces, and in such a way that one-side shielding plate 180A and the other-side shielding plate 180B form the upper surface or the lower surface. In this case, there is an advantage that a plurality of filter bodies 105 can be arranged ultrathinly in the front and back directions with less occupation of the space in the front and back directions in the installation space of the antenna cover body.

[0059] On the other hand, as Figure 3 and Figure 4 shown, the resonator frame 200 is formed on the lower cover plate 300 in such a way as to penetrate the inside and outside of the cavity C. After the lower end portion is forcibly snapped and joined to a plurality of snap-through holes 310h arranged in two or more columns in the width direction at intervals along the length direction, the peripheries of the plurality of snap-through holes 310h are fixed by soldering inside the cavity C. Here, the lower end portion of the resonator frame 200 refers to the portion adjacent to the lower cover plate 300 among the two end portions in the thickness direction.

[0060] Moreover, as described above, the filter body 105 is made of a first material. By performing a deep drawing process on a thin metal plate made of copper material with a thickness of 3.0t or less, the above-mentioned plate 120 with one-side thickness, the plate 130 with the other-side thickness, the one-side shielding plate 180A, the other-side shielding plate 180B, and the plate 150 formed on the upper part of the body are formed integrally. Moreover, the mounting edge plate 110 can also be formed integrally by a single deep drawing process.

[0061] And the lower cover plate 300 can be made of the same first material as the filter body 105, that is, copper material, and can be manufactured by a stamping process (sheet metal process) instead of a deep drawing process.

[0062] On the other hand, the resonator frame 200 is made of a second material different from the filter body 105 and the lower cover plate 300 made of copper material as the first material. By performing a stamping process (sheet metal process) on a plate made of stainless steel plate (SUS) material with a thickness of a specified value or more (at least the thickness is greater than the thickness of 3.0t of the filter body 105), the above-mentioned plurality of resonator rods 220 are formed integrally.

[0063] Among them, the lower cover plate 300 combined with the resonator frame 200 is made of a first material of copper, and the resonator frame 200 is made of a second material different from the first material, that is, SUS material. When combined in a manner of directly standing the resonator frame 200 upright on the inner side surface of the lower cover plate 300 and then welding and combining along its contact end, not only is its bonding force very weak, but there is also a problem that the insertion loss amount (Insert Loss) inside the cavity C generated by the welding combination will increase.

[0064] Therefore, in order to minimize the insertion loss as described above and achieve stable internal bonding, the filter 100 for a communication device according to an embodiment of the present invention solders the periphery of the lower end of the resonator frame 200 that penetrates through a plurality of snap-through holes 310h and protrudes to the outside.

[0065] On the other hand, as Figure 3 and Figure 4 shown, the resonator frame 200 may include: a plurality of resonator rods 220, which are arranged side by side along the length direction and separated by a predetermined distance in two columns in the width direction of the cavity C; a resonator connecting rod 210, which is used to connect the lower ends of the resonator rods 220 in each column, and is formed with resonator coupling ends 215 that are respectively inserted into a plurality of snap-through holes 310h to expose their lower ends to the outside of the cavity C; and resonator characteristic ends 230, which are formed at the front ends (upper ends) of the respective resonator rods 220.

[0066] Among them, the plurality of resonator rods 220 are arranged in a manner of being separated along the length direction inside the cavity C, and adjacent resonator rods 220 can be arranged in a zigzag manner so as to achieve adjacent coupling between the first column and the second column in the width direction.

[0067] That is, the resonator frame 200 is arranged in a manner corresponding to the number of columns of the plurality of snap-through holes 310h formed in the lower cover plate 300, and the plurality of resonator rods 220 can be arranged at a predetermined distance along the length direction of the filter body 105 in a manner that they do not overlap each other in the width direction of the filter body 105.

[0068] On the other hand, notch forming portions 241 and 242 may be provided on the resonator frame 200, and notch rods are formed by extending a predetermined distance from the side portions of the resonator rods 220 on both sides of one of the plurality of resonator rods 220 arranged in sequence along the length direction of the filter body 105 in a direction orthogonal to each other's directions.

[0069] Among them, the notch forming parts 241 and 242 include: an L-shaped notch part 241, in which a notch rod connects a pair of resonator rods 220 separated in such a way as to span at least one or more adjacent resonator rods 220; and a C-shaped notch part, in which a notch rod does not connect a pair of resonator rods 220 separated in such a way as to span at least one or more adjacent resonator rods 220. Compared with the L-shaped notch part 241, the C-shaped notch part 242 can have the notch rod formed at a position closer to the upper surface of the filter body 105 (assuming the resonance characteristic end 230) among the above-mentioned plurality of resonator rods 220.

[0070] On the other hand, the filter body 105 and the lower cover plate 300 are made of the same material. The first material can be copper, and the second material of each resonator rod 220 forming the resonator frame 200 can be a conductive material other than the copper material (preferably a stainless steel plate (SUS) material), which has been described above.

[0071] Moreover, a plurality of tuning scribing surfaces 156 can be provided on the upper surface of the filter body 105, respectively located at positions corresponding to directly above the plurality of resonator rods 220, and the fine frequency is adjusted by scribing to adjust the separation distance from the plurality of resonator rods 220.

[0072] The thickness of the plurality of tuning scribing surfaces 156 is less than the thickness of the upper surface of the filter body 105. Assuming that the plurality of tuning scribing surfaces 156 extend along the length direction to form a rectangle, both ends in the length direction are connected to the main body upper forming plate 150 corresponding to the upper surface of the filter body 105 in an integrated manner, and both ends in the width direction are cut and formed on the main body upper forming plate 150 corresponding to the upper surface of the filter body 105.

[0073] Furthermore, a plurality of coupling adjustment surfaces 157 can be provided on the upper surface of the filter body 105, respectively provided at positions corresponding to between adjacent resonator rods 220 among the plurality of resonator rods 220, and the coupling value between the adjacent resonator rods 220 is changed by a scribing action that deforms and protrudes into the inner shape of the cavity C.

[0074] Among them, the thickness of the plurality of coupling adjustment surfaces 157 is less than the thickness of the upper surface of the filter body 105. Assuming that the plurality of coupling adjustment surfaces 157 extend along the width direction to form a rectangle, one of both ends in the length direction based on its shape and both ends in the width direction are cut and formed on the main body upper forming plate 150 corresponding to the upper surface of the filter body 105. Therefore, the plurality of coupling adjustment surfaces 157 are supported in a cantilever form with the front end on the opposite side based on the uncut part of the main body upper forming plate 150 in the filter body 105, and shape deformation is achieved between the plurality of resonator rods 220 by an external force transmitted from the outside.

[0075] The filter 100 for a communication device according to an embodiment of the present invention configured with the above-described structure forms the filter body 105 by a deep drawing method, and is provided with a lower cover plate 300 for shielding the bottom of the opening of the filter body 105. The resonator frames 200 made of different materials are combined in a stable manner with the minimum insertion loss amount through a forced snap-in combination and a soldering combination, thereby providing the advantage of greatly improving the communication reliability of the communication device.

[0076] Figure 6 For Figure 1 a vertical cross-sectional view taken along the line A-A in Figure 7 and a partial enlarged view showing the combination form of the mounting plate of the filter body and the lower cover plate and the combination form of the lower cover plate and the resonator frame in its structure, Figure 1 a horizontal cross-sectional view taken along the line B-B in Figure 8 For Figure 1 a vertical cross-sectional view taken along the line A-A in Figure 9 and a partial enlarged view showing the coupling adjustment rod in its structure, Figure 1 a vertical cross-sectional view taken along the line A-A in Figure 10 The (a) part of Figure 1 is a top view of Figure 10 The (b) part of Figure 10 is a top view of the resonator frame,

[0077] Hereinafter, with reference to Figures 6 to 10 briefly describe the productivity and the effects in terms of frequency tuning design of the filter 100 for a communication device according to an embodiment of the present invention described with reference to Figures 1 to 5 First, as shown in

[0078] First, as Figure 6 shown, the filter 100 for a communication device according to an embodiment of the present invention forms the main body upper plate 150, the one-side thickness forming plate 120, the other-side thickness forming plate 130, the one-side shielding plate 180A, the other-side shielding plate 180B, and the mounting edge plate 110 in the filter body 105 at the same time through a deep drawing process, which is one of the stamping processes. By avoiding the existing forming process using a formed material, the productivity of the product can be greatly improved.

[0079] As described above, by using the deep drawing process as the manufacturing process of the filter body 105, the structure in the cavity C is simplified except for the separate combination of the lower cover plate 300 and the resonator frame 200 described later. In this regard, the advantage of being able to pre-block the insertion loss based on the setting of the existing separate structures can be provided.

[0080] And, asFigure 6 As shown, the lower cover plate 300 for shielding the bottom of the opening in the cavity C of the filter body 105 can be formed by a stamping process to have a shape corresponding to the outer edge of the mounting edge plate 110 of the filter body 105, and at the same time, a plurality of snap-through holes 310h for soldering the resonator frame 200 can be formed by a single stamping process.

[0081] As described above, as Figure 6 shown, the filter body 105 and the lower cover plate 300 formed by a deep drawing process and a stamping process are surface-bonded to each other between the lower surface of the mounting edge plate 110 and the upper surface of the edge end of the lower cover plate 300. After a soldering material is placed therebetween in advance, soldering can be achieved by the SMT method, thus having the advantage of greatly reducing the insertion loss in the cavity C.

[0082] Moreover, in the process of disposing the resonator frame 200 in the cavity C, as Figure 6 shown, after the resonator coupling ends 215 of the resonator frame 200 are respectively snapped and inserted in such a manner that their lower ends are exposed to the outside through the plurality of snap-through holes 310h formed in the lower cover plate 300 and then fixed by soldering on the outside, the soldering process inside the cavity C can be completely removed, which will form the advantage of completely blocking the insertion loss.

[0083] Next, the effect of the frequency tuning design of the filter 100 for a communication device according to an embodiment of the present invention will be described.

[0084] As Figure 7 shown, seven resonator rods 201, 202, 203, 204, 205, 206, 207 of the resonator frame 200 are arranged at intervals from one side to the other side in the length direction in the cavity C. The signal input through the first resonator rod 201 on one side is filtered in sequence through the second resonator rod 202 to the sixth resonator rod 206, and then output through the seventh resonator rod 207 on the other side.

[0085] Among them, generally, between a plurality of adjacent resonator rods from the first resonator rod 201 to the seventh resonator rod 207 (assuming, between the first resonator rod 201 and the second resonator rod 202, between the second resonator rod 202 and the third resonator rod 203, between the third resonator rod 203 and the fourth resonator rod 204, between the fourth resonator rod 204 and the fifth resonator rod 205, between the fifth resonator rod 205 and the sixth resonator rod 206, between the sixth resonator rod 206 and the seventh resonator rod 207), each signal path is defined by the reference numerals "① to ⑥", and the adjacent resonator rods 220 in each actual resonator rod 220 are filtered in sequence according to the above signal paths "① to ⑥".

[0086] In this case, a signal path ⑦ for presenting a C-notch at the left end (low-frequency region) of the passband through capacitive coupling based on the C-notch portions 204 formed in the first resonant bar 201 and the second resonant bar 202 respectively and a signal path ⑧ for presenting an L-notch at the right end (high-frequency region) of the passband through inductive coupling based on the L-notch portion 241 formed by connecting the fourth resonant bar 204 and the sixth resonant bar 206 can also be formed.

[0087] On the other hand, referring to Figure 8 and Figure 9 the above-mentioned plurality of tuning scribed surfaces 156 can be formed on the upper part of the main body corresponding to the positions of the resonant characteristic ends 230 of the respective resonant bars 201, 202, 203, 204, 205, 206, 207 of the resonator frame 200, and the above-mentioned plurality of coupling adjustment surfaces 157 can be formed on the upper part of the main body corresponding to between the respective resonant bars 201.

[0088] As Figure 10 shown, the filter 100 for a communication device according to an embodiment of the present invention formed with the above-described structure can perform adjacent coupling and cross-coupling in the signal paths ① to ⑥ during the process of inputting a signal through the first resonant bar 201 adjacent to one side of the cavity C and outputting the signal through the seventh resonant bar 207, and can perform coupling for forming an L-notch and a C-notch in the additional signal paths ⑦ and ⑧.

[0089] As described above, a filter for a communication device according to an embodiment of the present invention has been described in detail with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the above-described one embodiment, and various modifications can be made by those of ordinary skill in the technical field to which the present invention pertains, and it is natural that they can be implemented within an equivalent range. Therefore, the true scope of the rights of the present invention is defined by the appended claims.

[0090] Industrial Applicability

[0091] The present invention provides a filter for a communication device as follows, that is, after manufacturing a filter main body for forming a cavity through a deep drawing process, a resonator frame of a different material is forcibly snapped and joined to a lower cover plate of the same material that shields the opening of the cavity, and then soldering is performed to minimize the insertion loss in the cavity.

Claims

1. A filter for a communication device, characterized in that: Comprising: A filter main body provided with a cavity as a dielectric filling space, and the bottom of the cavity is open; A lower cover plate of a first material, which is combined in a manner to shield the bottom of the opening of the filter main body; and A resonator frame of a second material, which is combined with the lower cover plate and is provided with a plurality of resonator rods extending a predetermined length toward the upper surface of the filter main body, The resonator frame is formed on the lower cover plate in a manner that penetrates the inside and outside of the cavity. After the lower end portion is forcibly snapped and combined with a plurality of snap-through holes arranged in two or more rows in the width direction at intervals along the length direction, the peripheries of the plurality of snap-through holes are fixed by soldering inside the cavity.

2. The filter for a communication device according to claim 1, characterized in that: The resonator frame is provided in a manner corresponding to the number of rows of the plurality of snap-through holes formed in the lower cover plate, The plurality of resonator rods are arranged at a predetermined distance apart along the length direction of the filter main body in a manner that they do not overlap each other in the width direction of the filter main body.

3. The filter for a communication device according to claim 2, wherein A notch forming portion is provided on the resonator frame, and the notch forming portion is formed with notch rods extending a predetermined distance from the sides of the resonator rods on both sides of one of the plurality of resonator rods arranged in sequence along the length direction of the filter main body in a direction orthogonal to each other's directions.

4. The filter for a communication device according to claim 3, characterized in that: The notch forming portion includes: A C-shaped notch portion where the notch rods are not connected to each other; and An L-shaped notch portion where the notch rods are connected to each other, Compared with the L-shaped notch portion, the C-shaped notch portion forms the notch rods at a position closer to the upper surface of the filter main body among the plurality of resonator rods.

5. The filter for a communication device according to claim 1, characterized in that: The filter main body and the lower cover plate are of the same material, The first material is a copper material, and the second material is a conductive material other than the copper material.

6. The filter for a communication device according to claim 1, wherein, A plurality of tuning scribing surfaces are provided on the upper surface of the filter main body, respectively located at positions corresponding to directly above the plurality of resonator rods, and the fine frequency is adjusted by scribing to adjust the separation distance from the plurality of resonator rods.

7. The filter for a communication device according to claim 6, wherein The thickness of the plurality of tuning scribing surfaces is smaller than the thickness of the upper surface of the filter main body, and both ends in the length direction are integrally formed and connected to the upper surface of the filter main body, and both ends in the width direction are cut and formed on the upper surface of the filter main body.

8. The filter for a communication device according to claim 5, wherein A plurality of coupling adjustment surfaces are provided on the upper surface of the filter main body, respectively provided at positions corresponding to between adjacent resonator rods among the plurality of resonator rods, and the coupling value between the adjacent resonator rods is changed by a movement of deforming and protruding into the shape of the cavity inside by scribing.

9. The filter for a communication device according to claim 8, characterized in that, The thickness of the plurality of coupling adjustment surfaces is smaller than the thickness of the upper surface of the filter main body, and one of both ends in the length direction and both ends in the width direction are cut and formed on the upper surface of the filter main body.

10. The filter for a communication device according to claim 1, wherein The filter body is manufactured by deep drawing so as to form a joint portion that comes into surface contact with an edge end portion of the lower cover plate.

11. The communication device filter according to claim 1, characterized in that: The resonator frame comprises: A plurality of resonant rods are arranged in two rows in the width direction of the cavity in a manner of being arranged side by side in the length direction and spaced apart by a predetermined distance; A resonator connecting rod is formed with resonator coupling ends respectively inserted into a plurality of snap-in through holes of the lower cover plate; and The resonant characteristic end is formed at the front end of the plurality of resonant rods. The lower end of the resonator coupling end exposed to the outside is soldered and coupled through the plurality of snap-in through holes of the lower cover plate from the outside of the lower cover plate.

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