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, which comprises a base material plate that is made of a conductive material, is manufactured in an unfolded state, forms a cavity therein when folded, and forms a space for accommodating a plurality of resonators by folding, the plurality of resonators protruding from the inside of the cavity by a predetermined length in a thickness direction or a width direction, the plurality of resonators include resonance characteristic ends, the front end portions of the resonance characteristic ends have a wider width than other portions, and both ends of the width are wound into an arc shape from the front ends of the other portions in the thickness direction of one side, thereby providing advantages such as easy miniaturized manufacturing, reduced insertion loss, and improved resonance characteristics.

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 that is easy to manufacture, easy to ensure the use area of a main board (or PA board), and can prevent the overall size of an antenna device from increasing in the thickness direction. Background Art

[0002] Wireless frequency devices such as wireless frequency filters (including all "communication devices") generally consist of a connection structure of multiple resonators. Such a resonator is a circuit device in which a combination of an inductor L and a capacitor C resonates at a specific frequency through an equivalent electronic circuit. Each resonator has a structure in which a dielectric resonance device (DR, Dielectric Resonance element) or a metal resonance device is provided inside a cavity such as a metal cylinder or a rectangular parallelepiped surrounded by a conductor. Thus, each resonator forms a structure capable of achieving high-frequency resonance by having only an electromagnetic field of an inherent frequency within the processing band in the corresponding cavity. Generally, multiple cavities are used to form multiple resonance stages, and a multi-stage structure in which multiple resonance stages are connected in sequence is provided.

[0003] As an example related to a wireless frequency filter having a multiple cavity structure, there is Korean Patent Publication No. 10-2004-0100084 (title: "Wireless Frequency Filter", publication date: December 02, 2004) previously applied for by the applicant of the present application.

[0004] However, in existing wireless frequency filters, since each resonator extends in the thickness direction within the cavity, a part of the filter tuning cover covering the cavity is deformed in a cornering manner to tune the distance from the resonator, thereby having a desired band-pass characteristic. Therefore, there is a very limited problem in reducing the size of the finished filter in the thickness direction.

[0005] Moreover, in existing wireless frequency filters, as part of enhancing the skirt characteristics between adjacent resonators or separating resonators within multiple cavities, it is necessary to additionally provide a conductive material for achieving inductive coupling or capacitive coupling. Therefore, the finished filter has a problem of a significant increase in weight.

[0006] On the other hand, in an antenna device applying Massive MIMO (Multiple In-put Multiple Out-put) technology, in order to achieve miniaturized manufacturing of the overall product, research is being conducted in the direction of minimizing the thickness of internal structures such as filters. For this purpose, the most commonly used filter type for this purpose is a dielectric ceramic filter.

[0007] However, due to its material characteristics, the dielectric ceramic filter needs to be directly attached to one side of the main board (or PA board) laminated inside the antenna housing. Therefore, there is an inevitable problem of restricting the use of both sides of the printed circuit board (PCB). Summary of the Invention

[0008] Technical Problem

[0009] In order to solve the above-mentioned technical problems, an object of the present invention is to provide a filter for a communication device as follows, that is, the insertion loss caused by the combination of two physical structures can be reduced by omitting the existing bonding process for cavity formation and setting structures such as resonators in the cavity.

[0010] Furthermore, another object of the present invention is to provide a filter for a communication device as follows, that is, the resonant characteristic ends of a plurality of resonators can be easily set in the cavity by a folding (bending) method.

[0011] The technical problems of the present invention are not limited to the above-mentioned problems, and those skilled in the art to which the present invention pertains can clearly understand other technical problems not mentioned through the following description.

[0012] Technical Solution

[0013] A filter for a communication device according to an embodiment of the present invention includes a base plate made of a conductive material, which is manufactured in an unfolded state and forms a cavity inside when folded, and forms a space for accommodating a plurality of resonators through folding. The plurality of resonators protrude a predetermined length from the inside of the cavity along the thickness direction or the width direction. The plurality of resonators include resonant characteristic ends, and the front end portion of the resonant characteristic ends has a width wider than other portions, and both ends of the width are wound along one side thickness direction from the front end of the other portions to form an arc shape.

[0014] Among them, at least one of the plurality of resonators is connected to a separately configured input terminal pin, and the input terminal pin is connected to an input port to receive a signal transmitted from the input port of the main board. At least one of the other plurality of resonators may be connected to a separately configured output terminal pin, and the output terminal pin is connected to an output port to transmit a signal through the output port of the main board.

[0015] Moreover, in the resonant characteristic ends of the plurality of resonators, both ends of the arc-shaped width may be separated from each other by a predetermined distance.

[0016] Furthermore, in the resonant characteristic ends of the plurality of resonators, at least one circular or semi-circular horizontal cross-section may be provided.

[0017] Moreover, the above-mentioned base substrate is made of either a conductive material or a non-conductive material. When the above-mentioned base substrate is made of a non-conductive material, a film of a conductive substance is formed inside at least corresponding to the above-mentioned cavity by plating.

[0018] Moreover, air with a dielectric constant of 1 can be filled in the above-mentioned cavity.

[0019] Moreover, after folding, the above-mentioned base substrate may include: a main body bottom forming plate for forming the bottom surface of the above-mentioned cavity; a side thickness forming plate and another side thickness forming plate for increasing the size in the thickness direction of the above-mentioned cavity; and a main body upper forming plate for covering the upper part of the above-mentioned cavity.

[0020] Moreover, the above-mentioned main body bottom forming plate may include: a side main body bottom forming plate for forming one side bottom surface of the above-mentioned cavity; and another side main body bottom forming plate for forming the other side bottom surface of the above-mentioned cavity. After folding, the above-mentioned side main body bottom forming plate and the above-mentioned another side main body bottom forming plate form the complete bottom surface of the above-mentioned cavity.

[0021] Moreover, after folding, the above-mentioned base substrate may further include a side shielding plate and another side shielding plate for shielding one end and the other end in the length direction of the above-mentioned cavity.

[0022] Moreover, the above-mentioned base substrate may further include a plurality of resonators formed on the above-mentioned side main body bottom forming plate and the above-mentioned another side main body bottom forming plate.

[0023] Effects of the Invention

[0024] The filter for a communication device of the present invention can be manufactured through a simple folding process without using the existing method for constructing structures inside the cavity, that is, the existing joining (welding or brazing) process. Therefore, the communication reliability can be improved by reducing the insertion loss caused by applying the joining process.

[0025] Moreover, the present invention can form a cavity using a thin base substrate of 3t or less. Therefore, the weight reduction and miniaturization of the product can be achieved by reducing the size in the thickness direction of the overall antenna device product. Description of the Drawings

[0026] Figure 1 It is a perspective view showing a filter for a communication device according to an embodiment of the present invention.

[0027] Figure 2 It is for Figure 1 an internal perspective view.

[0028] Figure 3 It is for showing Figure 1 a perspective view of the unfolded state of the base substrate in the structure of

[0029] Figure 4 is Figure 3 the top view of

[0030] Figure 5 is a exploded perspective view showing an embodiment in which an input terminal pin and an output terminal pin are respectively provided in the structure of Figure 1

[0031] Figure 6 is a sectional perspective view (a, b) cut along line A-A.

[0032] Figure 7 is a partially enlarged view of a cross-sectional view and a top view showing the fixing structure of the input terminal pin and the output terminal pin in the structure of Figure 1

[0033] Figure 8 is a perspective view showing a first example of a plurality of resonators in the structure of Figure 1

[0034] Figure 9a and Figure 9b is a perspective view of a filter for a communication device showing a second embodiment of the present invention.

[0035] Figure 10a and Figure 10b is Figure 9a and Figure 9b the internal perspective view of

[0036] Figure 11 is Figure 9a the top view of the base substrate in the structure of

[0037] Figure 12 is a exploded perspective view showing an embodiment in which an input terminal pin and an output terminal pin are respectively provided in the structure of Figure 9a

[0038] Figure 13 is Figure 9a a sectional perspective view of the structure of in a state where a part of the upper plate forming portion is removed along line D-D.

[0039] Figure 14 is a perspective view showing various examples of a plurality of resonators in the structure of Figure 9a

[0040] Description of Reference Numerals

[0041] 100: First Embodiment 105: Base Substrate

[0042] 110: Main Body Bottom Forming Plate 120: One-Side Thickness Forming Plate

[0043] 130: The Other-Side Thickness Forming Plate 140: Notch Forming Plate

[0044] 150: Upper body forming plate 160: Resonator plate

[0045] 170: Multiple resonators 1100: Second embodiment

[0046] 1110A: Bottom forming plate of one side of the main body 1110B: Bottom forming plate of the other side of the main body

[0047] 1120: Thickness forming plate of one side 1130: Thickness forming plate of the other side

[0048] 1150: Upper body forming plate 1170: Multiple resonators

[0049] 1180A-1: First shielding plate of one side 1180A-2: Second shielding plate of one side

[0050] 1190: Partition board Detailed implementation mode

[0051] 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.

[0052] In the process of assigning reference numerals to the structural elements of each drawing, it should be noted that even if the same structural elements are shown in different drawings, the same reference numerals are assigned as much as possible. And, in the process of describing the embodiments of the present invention, when it is determined that a detailed description of a known structure or function hinders the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

[0053] When describing the structural elements of the embodiments of the present invention, terms such as "first", "second", "A", "B", "(a)", "(b)" can be used. Such terms are only used to distinguish one structural element from other structural elements, and the above terms do not limit the nature, order or sequence of the corresponding structural elements. And, unless otherwise defined, the meanings of all terms used herein, including technical terms or scientific terms, are the same as those generally understood by those of ordinary skill in the technical field to which the present invention belongs. Terms defined in commonly used dictionaries should be interpreted to have the same meaning as the meaning in the context of related technologies, and should not be interpreted as idealized or overly formal meanings unless clearly defined in this specification.

[0054] Figure 1 To show a perspective view of a filter for a communication device according to the first embodiment of the present invention, Figure 2 For Figure 1 Internal perspective view of Figure 3 To show Figure 1 A perspective view of the unfolded state of the base material plate in the structure of Figure 4 For Figure 3 Top view of Figure 5 To showFigure 1 Exploded perspective view of an embodiment in which an input terminal pin and an output terminal pin are respectively provided in the structure Figure 6 Is a sectional perspective view (a, b) cut along line A-A Figure 7 To show Figure 1 Partial enlarged view of a cross-sectional view and a top view of the fixing structure of the input terminal pin and the output terminal pin in the structure Figure 8 To show Figure 1 Perspective view of the first example of a plurality of resonators in the structure

[0055] Generally, in the field of antenna technology, a filter only filters signals in a specific frequency band among the signals to be input or output during the transceiver process, so as to obtain only the signals desired by consumers (users) as the result value

[0056] In order to filter signals in the above manner, as the name implies, a cavity filter forms a cavity between the input port of the input signal and the output port of the output signal as a predetermined signal filtering area, and obtains the frequency signal value of a specific frequency band within the desired range of consumers through the frequency tuning process of the cavity

[0057] However, so far, only the following process has been publicly available in the same industry of manufacturing antenna devices: in order to manufacture a cavity filter, the inside of a filter body including a ceramic material or a rigid material above it is processed to manufacture a cavity, and necessary structures such as a plurality of resonators of a frequency filter are separately manufactured and fixed inside the cavity

[0058] However, the technical feature of the filter for a communication device according to an embodiment of the present invention is that without using the above manufacturing process, a single flat base material plate with a thickness not exceeding a specified thickness is processed into a sheet metal form, and then a structure is constructed in the cavity through a folding process without going through an additional bonding process. Hereinafter, the specific technical features will be described in sequence according to the embodiments

[0059] The filter 100 for a communication device according to the first embodiment of the present invention includes a base material plate 105, which is made of a conductive material and is manufactured in an unfolded state. When folded, a cavity C is formed inside, and a space for accommodating a plurality of resonators 170 is formed through folding. The plurality of resonators protrude a specified length from the inside of the cavity C along the thickness direction or the width direction

[0060] Preferably, the base material plate 105 is made of a conductive material. However, it may also be made of a non-conductive material that is easy to manufacture. Subsequently, a film of a conductive substance may also be formed on the inside and outside of the cavity C or at least corresponding to the inside of the cavity C through plating so as to be able to perform the function of the cavity C

[0061] However, as described below, unless an external force is applied, after being deformed by the folding process, the base substrate 105 needs to continuously maintain its shape. Therefore, preferably, the base substrate 105 should be made of a variable material that can be appropriately processed.

[0062] Among them, the cavity C serves as a dielectric filling space for filling a dielectric with a specified dielectric constant, and refers to a space that is empty inside to fill the dielectric. Since air also belongs to a dielectric with a dielectric constant of 1, it needs to be clearly stated in advance that when using air in the atmospheric pressure state as the dielectric, no separate dielectric filling process is required.

[0063] On the other hand, in the filter 100 for a communication device according to the first embodiment of the present invention, the base substrate 105 is used to form the cavity C as the dielectric filling space.

[0064] Among them, as Figure 3 and Figure 4 shown, after folding, the base substrate 105 may include: a main body bottom forming plate 110 for forming the bottom of the cavity C; a one-side thickness forming plate 120 and an other-side thickness forming plate 130 that extend in a plane at one end and the other end in the width direction of the main body bottom forming plate 110 and increase the dimension in the thickness direction of the cavity C to increase the width length; a resonator plate 160 that extends from the front end of one of the one-side thickness forming plate 120 and the other-side thickness forming plate 130, and a plurality of resonators 170 are protrudingly provided in the cavity C corresponding to the upper part of the main body bottom forming plate 110; and a main body upper forming plate 150 that extends from the front end of the other of the one-side thickness forming plate 120 and the other-side thickness forming plate 130, faces the main body bottom forming plate 110 and covers the upper part of the cavity C.

[0065] And, on one end and the other end in the length direction of the main body bottom forming plate 110, a one-side shielding plate 180A and an other-side shielding plate 180B can be integrally extended to shield the open length direction ends of the cavity C.

[0066] Among them, although it is defined that the one-side shielding plate 180A and the other-side shielding plate 180B are formed integrally with the main body bottom forming plate 110, according to the embodiment, they can also be symmetrically formed integrally with an adjacent plate (for example, the main body upper forming plate 150, etc.). And the one-side shielding plate 180A and the other-side shielding plate 180B are divided into two components and formed integrally with the adjacent plate, and the open parts of each cavity C can also be completely shielded through the folding operation.

[0067] On the other hand, in the plate 110 formed at the bottom of the main body, an input port setting portion 115A and an output port setting portion 115B formed to penetrate vertically may be provided at one end in the length direction and the other end in the length direction, respectively. The following input terminal pin 175A may be provided to penetrate through the input port setting portion 115A, and the following output terminal pin 175B may be provided to penetrate through the output port setting portion 115B.

[0068] In particular, as Figure 7 shown, the input port setting portion 115A and the output port setting portion 115B are formed as circular holes having a horizontal cross-sectional area larger than that of the input terminal pin 175A or the output terminal pin 175B, and a part of the end portion of the hole edge may be formed as a boss portion 116 protruding a predetermined length along the inside of the cavity C.

[0069] Among them, a Teflon 118 for impedance matching is interposed on the outer side surface of the input terminal pin 175A or the output terminal pin 175B, and a fixing protrusion portion 117 having a stud or serrated protrusion shape for stably fixing the Teflon 118 is integrally formed on the inner peripheral surface of the holes of the input port setting portion 115A and the output port setting portion 115B including the boss portion 116. Thus, with forced snap-in coupling, the advantage of being able to minimize insertion loss can be achieved by stably fixing the Teflon 118.

[0070] Moreover, as Figure 3 and Figure 4 shown, the base plate 105 may further include a notch forming plate 140, which is disposed between the resonator 170 of the main body upper forming plate 150 and the resonator plate 160 connecting the one-side thickness forming plate 120 and the other-side thickness forming plate 130, and is arranged to extend horizontally (or in the thickness direction) within the cavity C.

[0071] The shape of the notch forming plate 140 corresponds to the surrounding shape of the cavity C, and forms a frame shape penetrating vertically. An L-shaped notch portion 141 and a C-shaped notch portion 142 having specific shapes may be provided at one inner end and the other inner end in the width direction, respectively.

[0072] Among them, the L-shaped notch portion 141 and the C-shaped notch portion 142 do not necessarily have to be provided on the notch forming plate 140, and may also be formed integrally with the main body upper forming plate 150 within the range that can be deformed by the staff who performs frequency tuning later inside the cavity C.

[0073] Referring to Figure 3 and Figure 4 , when the notch forming plate 140 and the main body upper forming plate 150 are provided at the same time, the base plate 105 may be formed integrally with a one-side partition plate 151 and a other-side partition plate 152 that separate the notch forming plate 140 and the main body upper forming plate 150 along the thickness direction inside the cavity C.

[0074] Among them, after the formation of the plate 150 on the upper part of the main body is completed and folded, the lower end of the other partition plate 152 can be welded and joined to the upper end of the other thickness forming plate 130 which is the starting part (one end) of the notch forming plate 140 as a notch.

[0075] Moreover, after the resonator plate 160 is completed and folded, the end part (the other end) of the notch forming plate 140 corresponding to the lower end of one partition plate 151 can be welded and joined to the upper surface of the part overlapping with the resonator plate 160 along the thickness direction. On the other hand, in the plate 150 formed on the upper part of the main body, a plurality of resonators 170 form a single layer with respect to the thickness direction inside the cavity C, and a frequency adjustment rod (not shown) for performing micro frequency tuning by adjusting the separation distance from the plurality of resonators 170 and a plurality of coupling adjustment rods (not shown) that are directly downwardly deformed in shape between the plurality of resonators 170 can be integrally cut and formed.

[0076] Moreover, a tool insertion hole (not shown) is formed through the plate 150 formed on the upper part of the main body, whereby the shapes of the L-shaped notch part 141 and the C-shaped notch part 142 can be changed using a specified tool.

[0077] Among them, as Figures 2 to 7 shown, when the cavity C generated in each part of the base material plate 105 forms a small rectangular parallelepiped shape that is relatively long in the length direction and has a relatively small size in the up and down thickness direction compared to the front and back width direction, the plurality of resonators 170 can form the same single layer with respect to the thickness direction of the cavity C.

[0078] Moreover, the L-shaped notch part 141 and the C-shaped notch part 142 provided on the notch forming plate 140 can also form the same single layer with respect to the thickness direction of the cavity C, or can form a single layer different from the above-mentioned plurality of resonators 170.

[0079] In this case, the thickness of each single layer formed by the plurality of resonators 170, the L-shaped notch part 141, and the C-shaped notch part 142 is the thickness of the base material plate 105. At the point of forming a very thin thickness, an ultra-thin design desired by the designer can be designed without increasing the size including the thickness of the entire product.

[0080] On the other hand, referring to Figure 8 , the plurality of resonators 170 can include a resonance characteristic end 173, the front end part is flat and has a wider width, and forms the same layer as other parts inside the cavity C. Hereinafter, for the convenience of description, as each structural part of the plurality of resonators 170 extends integrally from the base material plate 105, the body part connecting the resonance characteristic end and the front end part is called a resonance rod 171.

[0081] Among them, at least one of the plurality of resonators 170 can integrally form an input terminal pin 175A, which is connected to an input port to receive a signal transmitted from the input port (not shown), and another one of the plurality of resonators 170 can integrally form an output terminal pin 175B, which is connected to an output port to transmit a signal through the output port (not shown).

[0082] On the other hand, as shown in part (a) of Figure 8 , the resonance characteristic ends 173 of the plurality of resonators 170 can integrally extend in an angular manner at the front end of the above-mentioned other part (resonance rod 171).

[0083] And, as shown in part (b) of Figure 8 , the resonance characteristic ends 173 of the plurality of resonators 170 can integrally extend in an arc manner at the front end of the above-mentioned other part (resonance rod 171).

[0084] Finally, as shown in part (c) of Figure 8 , the resonance characteristic ends 173 of the plurality of resonators 170 can integrally extend in a "U" shape surrounding the front end of the above-mentioned other part (resonance rod 171) at the front end of the above-mentioned other part (resonance rod 171).

[0085] The manufacturing method of the filter for a communication device according to the first embodiment of the present invention having the above structure will be briefly described below.

[0086] First, after preparing a base plate 105 of a conductive material or a non-conductive material (base plate preparation process), it is moved to a stamping template and stamped and sheet-metal processed according to a pre-designed shape (stamping and sheet-metal processing process).

[0087] In this case, as described above, preferably, the base plate 105 is sheet-metal designed to form a cavity C that shields the outside by a main body bottom forming plate 110, a one-side thickness forming plate 120, a the other-side thickness forming plate 130, a one-side shielding plate 180A and a the other-side shielding plate 180B, a main body upper forming plate 150 and other plates directly connected thereto (for example, a one-side partition plate 151 and a the other-side partition plate 152) through the following folding process.

[0088] Moreover, after the base plate 105 is stamped and sheet-metal processed through the stamping and sheet-metal processing process, if the material of the base plate 105 is a non-conductive material, a separate conductive coating process is additionally performed to form a film of a conductive substance at least inside the entire cavity C, and then, the folding process for forming the cavity C can be sequentially performed.

[0089] Among them, in the folding process, with the bottom plate 110 of the main body as a reference, the cavity C is folded in sequence from the lower part to the upper side to form the required related plates. The multiple resonators 170 formed on the resonator plate 160 are folded to form the same layer (or single layer) within the cavity C. The L-shaped notch portion 141 and the C-shaped notch portion 142 formed on the notch forming plate 140 can be folded to form different single layers with the multiple resonators 170 inside the cavity C.

[0090] On the other hand, in terms of the layer where the cavity C is formed by folding the base substrate 105 (folding method), the filter for a communication device according to an embodiment of the present invention is not limited to the above-described first embodiment 100. Hereinafter, the filter 1100 for a communication device according to a second embodiment of the present invention will be described in detail.

[0091] Figure 9a and Figure 9b FIG. is a perspective view showing a filter for a communication device according to a second embodiment of the present invention, Figure 10a and Figure 10b is Figure 9a and Figure 9b an internal perspective view of Figure 11 is Figure 9a a top view of the base substrate in the structure of Figure 12 FIG. shows Figure 9a an exploded perspective view of an embodiment in which an input terminal pin and an output terminal pin are respectively provided in the structure of Figure 13 is in Figure 9a a sectional perspective view of a state where a part of the upper plate forming portion is removed along the D-D line in the structure of Figure 14 FIG. shows Figure 9a a perspective view of various examples of multiple resonators in the structure of

[0092] Refer to Figures 9a to 14, in the filter 1100 for a communication device according to the second embodiment of the present invention, after folding, the base substrate 1105 may include: a first side body bottom forming plate 1110A for forming a first bottom surface portion of the cavity C; a second side body bottom forming plate 1110B for forming a second bottom surface portion of the cavity C; a first thickness forming plate 1120 and a second thickness forming plate 1130 respectively extending from an outer end in the width direction of the first side body bottom forming plate 1110A and an outer end in the width direction of the second side body bottom forming plate 1110B for increasing the dimension in the thickness direction of the cavity C; a first first-side shielding plate 1180A-1 extending half of the dimension in the width direction from one end in the length direction of the first thickness forming plate 1120; a second first-side shielding plate 1180A-2 extending half of the dimension in the width direction from the other end in the length direction of the second thickness forming plate 1130; a second-side shielding plate 1180B extending in the width direction such that the other end in the length direction of the first thickness forming plate 1120 is connected to the one end in the length direction of the second thickness forming plate 1130; and a body upper forming plate 1150 extending from the other end in the width direction facing the one end in the width direction of the first thickness forming plate 1120 with respect to the first side body bottom forming plate 1110A, covering the upper portion of the cavity C facing the first side body bottom forming plate 1110A and the second side body bottom forming plate 1110B.

[0093] Among them, a plurality of resonators 1170 may be included at outer end portions of the first side body bottom forming plate 1110A and outer end portions of the second side body bottom forming plate 1110B, and the plurality of resonators 1170 extend along the thickness direction side facing the body upper forming plate 1150 inside the bottom of the cavity C.

[0094] More specifically, a part (three) of the plurality of resonators 1170 is formed at the outer end portion of the first side body bottom forming plate 1110A, and is bent and disposed at the bottom of a resonance cut portion cut at a specified depth inside the width direction of the first side body bottom forming plate 1110A. The remaining part (three) of the plurality of resonators 1170 is formed at the outer end portion of the second side body bottom forming plate 1110B, and is bent and disposed at the bottom of a resonance cut portion cut at a specified depth inside the width direction of the second side body bottom forming plate 1110B, and is formed in two columns along the thickness direction inside the cavity C and may protrude toward the body upper forming plate 1150.

[0095] Moreover, the filter 1100 for a communication device according to the second embodiment of the present invention may further include a partition plate 1190 disposed at an outer end portion of one of the first first-side shielding plate 1180A-1 and the second first-side shielding plate 1180A-2, and when performing a folding process, it folds into the inside of the cavity C and divides the cavity C into two sides in the width direction at the spatial level.

[0096] According to the above structure, if the filter 1100 for communication equipment of the second embodiment of the present invention is compared with the filter 100 for communication equipment of the first embodiment of the present invention, the following differences exist.

[0097] First, in the filter 100 for communication equipment of the first embodiment of the present invention, the main body bottom forming plate 110 forming the bottom of the cavity C is a non-separable single plate structure, while in the filter 1100 for communication equipment of the second embodiment of the present invention, the main body bottom forming plates 1110A and 1110B forming the bottom of the cavity C are separated into two along the width direction of the cavity C. A plurality of resonators 1170 can be integrally formed at one end of the main body bottom forming plates 1110A and 1110B, so as to be able to fold along the thickness direction side of the cavity C from one end of each separated main body bottom forming plate 1110A and 1110B without additionally arranging a resonator plate.

[0098] After that, when the folding process is performed, the one main body bottom forming plate 1110A separated into two and the other main body bottom forming plate 1110B can be joined to each other to form a complete bottom surface of the cavity C.

[0099] Moreover, in the filter 100 for communication equipment of the first embodiment of the present invention, one thickness forming plate 120 and the other thickness forming plate 130 respectively extend and are formed from one end and the other end in the width direction of the main body bottom forming plate 110, and one shielding plate 180A and the other shielding plate 180B respectively extend and are formed at one end and the other end in the length direction of the main body bottom forming plate 110, while in the filter 1100 for communication equipment of the second embodiment of the present invention, one thickness forming plate 1120 and the other thickness forming plate 1130 are respectively formed at the other ends of the main body bottom forming plates 1110A and 1110B, and are integrally formed and extend foldably. The one thickness forming plate 1120 and the other thickness forming plate 1130 can be connected into one body through the other shielding plate 1180B.

[0100] Furthermore, in the filter 1100 for communication equipment of the second embodiment of the present invention, among the two ends in the width direction of the one thickness forming plate 1120, the main body upper forming plate 1150 is integrally extended and formed at the other end in the width direction opposite to the main body bottom forming plate 1110A. Among the one end and the other end in the length direction of the one thickness forming plate 1120 and the other thickness forming plate 1120, the first one-sided shielding plate 1180A-1 and the second one-sided shielding plate 1180A-2 can be integrally formed at the corresponding ends where the above-mentioned other shielding plate 1180B is not formed, respectively occupying half of the area.

[0101] In particular, in the filter 1100 for a communication device according to the second embodiment of the present invention, a partition 1190 can be integrally formed at one longitudinal end of one of the side shielding plates 1180A-1 and 1180A-2, and one or more windows 1191 and 1192 are formed by cutting, and the cavity C can be divided into two spaces along both sides in the width direction.

[0102] On the other hand, referring to Figure 14 , in the filter 1100 for a communication device according to the second embodiment of the present invention, a plurality of resonators 1170 integrally formed on the main body bottom forming plates 1110A and 1110B may include resonance characteristic ends 1173. Each front end of the resonance rod 1171 has a wider width than other parts, and both ends of the width are formed in an arc shape by winding along one thickness direction from the front ends of the other parts.

[0103] More specifically, as shown in parts (a) and (b) of Figure 14 , in the resonance characteristic ends 1173A and 1173B of the plurality of resonators 1170, both ends of the above-mentioned arc-shaped width may be separated from each other by a predetermined distance.

[0104] And, the resonance characteristic end 1173A of the plurality of resonators 1170 may have at least one circular (refer to part (b) of Figure 14 ) or semi-circular horizontal cross-section (refer to part (a) of Figure 14 ).

[0105] Moreover, in the filter 100 for a communication device according to the first embodiment of the present invention, after one of the plurality of resonators 170 is integrally formed, when performing the folding process, the input terminal pin 175A and the output terminal pin 175B penetrate and are fixedly arranged in the input port setting part 115A and the output port setting part formed on the main body bottom forming plate 110. In the filter 1100 for a communication device according to the second embodiment of the present invention, the input terminal pin 1175A and the output terminal pin 1175B are separately arranged. The difference is that they penetrate and are fixedly arranged in the input port setting part 1115A formed on the first side shielding plate 1180A-1 and the output port setting part 1115B formed on the second side shielding plate 1180A-2 respectively.

[0106] The input terminal pin 1175A is connected to the above input port and one of the plurality of resonators 1170 to receive a signal transmitted from an input port formed on a main board (not shown), and the output terminal pin 1175B can be connected to the output port and one of the plurality of resonators 1170 to transmit a signal through an output port formed on a main board (not shown).

[0107] On the other hand, in the second embodiment 1100, the folding method and sequence of the base material plate 1105 are as shown in Figure 11as shown

[0108] As described above, although the filters 100, 200, 300, and 400 for communication devices according to the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the above embodiments, and various modifications and implementations within an equivalent technical scope can be made by those of ordinary skill in the technical field to which the present invention pertains. Therefore, the true scope of protection of the present invention should be defined based on the scope of the invention claimed.

[0109] Industrial Applicability

[0110] The present invention provides a filter for a communication device as follows, that is, the insertion loss amount caused by the combination of two physical structures can be reduced by omitting the existing bonding process for forming a cavity and arranging structures such as resonators in the cavity.

Claims

1. A filter for a communication device, characterized in that, it includes a base substrate made of a conductive material, which is manufactured in an unfolded state and forms a cavity inside when folded, and forms a space for accommodating a plurality of resonators through folding. The plurality of resonators protrude a predetermined length from the inside of the cavity along the thickness direction or the width direction. The plurality of resonators include resonant characteristic ends, and the front end portions of the resonant characteristic ends have a width wider than other portions, and both ends of the width are formed into an arc shape by winding along one thickness direction from the front end of the other portions.

2. The filter for a communication device according to claim 1, characterized in that, at least one of the plurality of resonators is connected with a separately configured input terminal pin, and the input terminal pin is connected to an input port to receive a signal transmitted from the input port of the main board. At least one of the other plurality of resonators is connected with a separately configured output terminal pin, and the output terminal pin is connected to an output port to transmit a signal through the output port of the main board.

3. The filter for a communication device according to claim 1, characterized in that, among the resonant characteristic ends of the plurality of resonators, both ends of the arc-shaped width are separated from each other by a predetermined distance.

4. The filter for a communication device according to claim 1, characterized in that, the resonant characteristic ends of the plurality of resonators may have at least one circular or semi-circular horizontal cross-section.

5. The filter for a communication device according to claim 1, characterized in that, the base substrate is made of one of a conductive material or a non-conductive material. When the base substrate is made of a non-conductive material, a film of a conductive substance is formed inside at least corresponding to the cavity by a plating method.

6. The filter for a communication device according to claim 1, characterized in that, the cavity is filled with air having a dielectric constant of 1.

7. The filter for a communication device according to claim 1, characterized in that, after folding, the base substrate includes: a main body bottom forming plate for forming the bottom surface of the cavity; a side thickness forming plate and another side thickness forming plate for increasing the size in the thickness direction of the cavity; and a main body upper forming plate for covering the upper part of the cavity.

8. The filter for a communication device according to claim 7, characterized in that, the main body bottom forming plate includes: a side main body bottom forming plate for forming one side bottom surface of the cavity; and another side main body bottom forming plate for forming the other side bottom surface of the cavity. After folding, the side main body bottom forming plate and the another side main body bottom forming plate form the complete bottom surface of the cavity.

9. The filter for a communication device according to claim 7, characterized in that, after folding, the base substrate further includes a side shielding plate and another side shielding plate for shielding one end and the other end in the length direction of the cavity.

10. The filter for a communication device according to claim 8, characterized in that, the base substrate further includes a plurality of resonators formed on the side main body bottom forming plate and the another side main body bottom forming plate.

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