JP7430230B2 - cavity filter - Google Patents

Description

The present invention relates to a cavity filter (CAVITY FILTER), and more particularly to a cavity filter for a massive MIMO antenna that has an improved connector fastening structure between the filter and a printed circuit board in consideration of ease of assembly and size.

The content described in this section merely provides background information on the present embodiment and does not constitute prior art.

MIMO (Multiple Input Multiple Output) technology is a technology that uses a large number of antennas to significantly increase data transmission capacity.The transmitter transmits different data through each transmitting antenna, and the receiver transmits different data. Spatial multiplexing is a technique that partitions transmitted data through appropriate signal processing. Therefore, by simultaneously increasing the number of transmitting and receiving antennas, the channel capacity is increased and a larger amount of data can be transmitted. For example, increasing the number of antennas to 10 would provide approximately 10 times more channel capacity using the same frequency band compared to current single antenna systems.

4G LTE-advanced uses up to eight antennas. Currently, products with 64 or 128 antennas are being developed in the pre-5G stage, and 5G is expected to use base station equipment with a much higher number of antennas, which will be combined with massive MIMO technology. Say. Compared to the current 2-Dimension cell operation, when Massive MIMO technology is introduced, 3D-Beamforming becomes possible, so Massive MIMO technology is also known as FD-MIMO (Full Dimension). Called.

In massive MIMO technology, as the number of antenna elements increases, the number of transceivers and filters also increases accordingly. Furthermore, as of 2014, there are more than 200,000 base stations installed nationwide. That is, there is a need for a cavity filter structure that minimizes mounting space and is easy to implement, so that the same filter characteristics are provided even after the individually tuned cavity filter is implemented in the antenna. A signal line connection structure is required.

An RF filter with a cavity structure is equipped with a resonator made of a resonant rod of the conductor inside a box structure made of a metal conductor, so that only an electromagnetic field of a natural frequency exists. It has the characteristic of passing only ultra-high frequency characteristic frequencies due to resonance. Bandpass filters having such a cavity structure have low insertion loss and are advantageous for high output, and are therefore widely used as filters for mobile communication base station antennas.

An object of the present invention is to provide a cavity filter that has a slimmer and more compact structure and has an RF connector built into the body in the thickness direction.

It is also an object of the present invention to provide an assembly method that can minimize the cumulative amount of assembly tolerances that occur when assembling a large number of filters, and an RF signal that is easy to implement and that maintains uniform frequency characteristics of the filters. An object of the present invention is to provide a cavity filter having a connected structure.

Another object of the present invention is to provide a cavity filter that can prevent signal loss by adding side tension while allowing relative movement in the case of a separate type of RF pin. Our goal is to provide the following.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description.

An embodiment of the cavity filter according to the present invention for achieving the above object includes an RF signal connecting part provided at a predetermined distance from an external member provided with an electrode pad on one side, and an electrode pad of the external member. electrically connecting the pad and the RF signal connection portion, absorbing assembly tolerances existing at the predetermined distance, and discontinuing electrical flow between the electrode pad and the RF signal connection portion; a dielectric body inserted into a terminal insertion opening so as to surround the outside of the terminal portion; an elastic member that elastically supports the terminal portion by an action of vertically deforming the hollow portion relative to a portion of the edge when an assembly force is transmitted to the terminal portion; , a terminal on one side connected to the electrode pad, and a terminal on the other side connected to the RF signal connection part.

Here, the terminal portion may be inserted into a terminal insertion hole formed in a filter body in which the RF signal connection portion is provided, using the dielectric as an intermediary.

Further, the dielectric body includes an upper inner dielectric body provided so as to surround a part of the outer circumferential surface of the one side terminal passing through a terminal installation hole provided in a hollow space, and an upper internal dielectric body provided so as to surround a part of the outer peripheral surface of the one side terminal, which passes through the terminal installation hole provided in the hollow space. A lower internal dielectric body is provided to surround a part of the outer circumferential surface of the other side terminal.

Further, the dielectric body has a second elastic member installation end formed to be larger than the diameter of the peripheral hole so as to support the edge portion of the elastic member, and a second elastic member installation end that is larger than the diameter of the second elastic member installation end. Also, one of the first elastic member installation ends formed in a large step shape may be formed.

The elastic member has a disc shape and has the hollow portion, and a plurality of outer edges supported by any one of the first elastic member installation end and the second elastic member installation end; and a first elastic member having a plurality of inner edges to which the one-side terminal is locked in the terminal portion; a first elastic member having a disc shape and the hollow portion; an elastic part provided with a plurality of lower support ends so as to be supported by any one of the second elastic member installation ends; and the one side terminal of the terminal part penetrating through the hollow part. and a second elastic member including a boss portion extending below the elastic portion so as to surround an outer circumferential surface of the elastic portion.

Further, the first elastic member includes an outer cutout portion in which the outer edge portion and the inner edge portion are cut and extended by a predetermined length from the outer peripheral surface toward the hollow portion; It can be partitioned by an inner incision section extending a predetermined length.

Further, the first elastic member may have the outer edge bent outward with respect to the inner edge.

Further, the second elastic member includes a large number of inner elastic cutouts formed by cutting vertically along the circumferential direction on the outside of the hollow part, and a plurality of inner elastic cutouts formed on the outside of the inner elastic cutout in the upper and lower directions along the circumferential direction. It can be elastically deformable by a large number of outer elastic incisions formed by incisions.

Also, the elastic member may be made of one of beryllium copper (BeCu), SUS, and spring steel.

Further, one of the one-side terminal and the other-side terminal may include a plurality of tension cutouts that are vertically elongated.

The tension cutout may be provided on the one side terminal, and an upper end portion of the other side terminal may be accommodated inside a lower end portion of the one side terminal.

Further, the tension cutout may be provided on the other side terminal, and a lower end portion of the one side terminal may be accommodated inside an upper end portion of the other side terminal.

Further, the dielectric may support an outer circumferential surface of the one side terminal or the other side terminal in which the plurality of tension cutouts are formed.

Further, a contact portion of the one-side terminal that contacts the electrode pad among the terminal portions may be formed in a conical shape with a curved upper end having a predetermined contact area.

Further, a contact portion of the one-side terminal that contacts the electrode pad among the terminal portions may be formed in a hemispherical shape with an upper end curved so as to have a predetermined contact area.

A cavity filter according to an embodiment of the present invention can achieve various effects as follows.

First, since the RF connector is built into the body in the thickness direction, a slimmer and more compact structural design is possible.

Second, there is an assembly method that can minimize the cumulative amount of assembly tolerances that occur when assembling a large number of filters, and an RF signal coupling structure design that is easy to implement and maintains uniform frequency characteristics of the filters. It has the effect of being possible.

Thirdly, by adding lateral tension while allowing relative movement, stable connection is possible, which has the effect of preventing deterioration in antenna performance.

Fourth, since the elastic member for eliminating assembly tolerances is made of one of beryllium copper, SUS, and spring steel, it is possible to prevent reliability from decreasing due to compressive strain. play.

FIG. 2 is a diagram illustrating a stacked structure of an exemplary massive MIMO antenna. FIG. 3 is a cross-sectional view showing a state in which a cavity filter according to an embodiment of the present invention is stacked between an antenna board and a control board. FIG. 1 is a plan perspective view of the structure of a cavity filter according to an embodiment of the present invention, viewed from the bottom side. FIG. 2 is an exploded perspective view showing a state in which a filter module and a terminal portion, which are part of the structure of a cavity filter according to an embodiment of the present invention, are separated. FIG. 5 is an exploded perspective view of FIG. 4; FIG. 1 is an exploded perspective view of a cavity filter according to an embodiment of the present invention. 4 is a partial sectional view of FIG. 3, showing a state before being bonded to a PCB board. FIG. 4 is a partial cross-sectional view of FIG. 3, showing a state after being bonded to a PCB board. FIG. This is a modification of FIGS. 7a and 7b. This is a modification of FIGS. 7a and 7b. FIG. 5 is a perspective view showing one embodiment of the elastic member of the configuration shown in FIG. 4; 10 is a perspective view showing a modification of one embodiment of the elastic member of the configuration shown in FIG. 9. FIG. 5 is a perspective view showing another embodiment of the elastic member in the configuration of FIG. 4. FIG. FIG. 12 is a partial cross-sectional view of FIG. 3 with the elastic member of FIG. 11 interposed therebetween.

Hereinafter, some embodiments of the present invention will be described in detail based on exemplary drawings.

When assigning reference numbers to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if they appear on different drawings. . In addition, when describing the embodiments of the present invention, detailed explanations of related known structures or functions will be omitted if it is determined that it would impede understanding of the embodiments of the present invention.

In 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 used only to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order, or sequence of the constituent elements. Further, 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. has. Terms as defined in commonly used dictionaries should be construed to have meanings consistent with the meanings they have in the context of the relevant art, and unless explicitly defined in this application, terms that are not be interpreted in any meaningful way.

FIG. 1 is a diagram illustrating a stacked structure of an exemplary massive MIMO antenna.

FIG. 1 merely shows an exemplary outer shape of an antenna device 1 in which an antenna assembly including a cavity filter according to an embodiment of the present invention is built, and the outer shape when actually stacked is shown. It is not limited.

The antenna device 1 includes a housing 2 in which a heat sink is formed, and a radome 3 coupled to the housing 2. An antenna assembly can be built in between the housing 2 and the radome 3.

A power supply unit (PSU) 4 is coupled to the lower part of the housing 2 by, for example, a docking structure, and the power supply unit 4 operates communication components provided in the antenna assembly. Provide operating power for

Usually, the antenna assembly includes cavity filters 7 arranged in correspondence with the number of antennas on the back side of an antenna board 5 on which a plurality of antenna elements 6 are arranged on the front side, and a related PCB board 8. It has a structure in which layers are successively laminated. Before mounting, the cavity filter 7 can be prepared by being tuned and verified in detail so that it has frequency characteristics that meet individual specifications. It is preferable that such tuning and verification processes be performed quickly in an environment with the same characteristics as the actual implementation state.

FIG. 2 is a cross-sectional view showing a state in which a cavity filter according to an embodiment of the present invention is stacked between an antenna board and a control board.

Referring to FIG. 2, a cavity filter 20 according to an embodiment of the present invention can eliminate the typical RF connector 90 shown in FIG. An antenna structure having the following structure can be provided.

Furthermore, by providing RF connection parts on both sides in the height direction and connecting them with the cavity filter 20 according to an embodiment of the present invention, even if vibration or thermal deformation occurs in the antenna board 5 or the PCB board 8, the RF connection can be maintained. is maintained in the same way, so there is an advantage that there is no change in frequency characteristics.

FIG. 3 is a plan perspective view of the structure of a cavity filter according to an embodiment of the present invention, seen from the bottom side, and FIG. 4 is a filter module and terminal portion that are part of the structure of a cavity filter according to an embodiment of the present invention. FIG. 5 is an exploded perspective view of FIG. 4, FIG. 6 is an exploded perspective view of a cavity filter according to an embodiment of the present invention, and FIG. 7a and FIG. 7b is a partial sectional view of FIG. 3, showing the state before and after bonding to a PCB board, and FIGS. 8a and 8b are modifications of FIGS. 7a and 7b.

Referring to FIG. 3, a cavity filter 20 according to an embodiment of the present invention includes an RF signal coupling portion (see reference numeral 31 in FIGS. ), a second case (not shown in the drawing) that covers the first case, and a terminal section provided in the height direction of the cavity filter 20 on both sides in the length direction of the first case (drawing number 40 in FIG. 4). ) and a filter module 30 including assembly holes 23 provided on both sides of the terminal portion 40 . The terminal part 40 passes through a terminal insertion opening 25 provided in the first case and electrically connects an electrode pad (not shown in the drawing) of an external member 8, such as an antenna board or a PCB board 8, to an RF signal connection part. Link.

The terminal section 40 is supported at its lower end in the drawing by an RF signal connection section (not shown), and when the antenna board or PCB board 8 is tightly coupled from above, the terminal section 40 is connected to the external member 8 (particularly on one side thereof). The filter body 21 can be elastically supported so as to eliminate assembly tolerances existing in the terminal insertion opening 25 of the filter body 21, which will be described later, while being constantly in contact with the provided electrode pads.

That is, the cavity filter 20 according to the present invention has the terminal portion 40 separated into one side terminal 50 and the other side terminal 60 as described later, and has a shape and assembly for applying side tension. It can be implemented in specific embodiments as described below to accommodate tolerances.

More specifically, as shown in FIGS. 4 to 8b, the terminal section 40 is comprised of two members (see drawing numbers 50 and 60 in FIG. 6) separated into an upper part and a lower part. In this case, it is possible to provide a separate type in which a part of one of the two members is inserted into a part of the other member. In one embodiment of the present invention, a part of the upper end of the other side terminal 60 is inserted into the lower part of the one side terminal 50. However, it goes without saying that the opposite structure can also be adopted.

Although not shown in the drawings, generally when the terminal portion 40 is provided as an integrated filter,
In order to eliminate assembly tolerances, a portion of the terminal portion 40 is made of an elastic body that elastically deforms when a predetermined assembly force is applied by an assembler. However, in the integrated filter in which the terminal portion 40 is integrally formed, there is no foreseeable interruption of the electrical flow from one end to the other, so a separate shape design for adding side tension is not required.

On the other hand, when the terminal section 40 is provided as a separable filter that is separated into two members, the separated one side terminal 50 and the other side terminal 60 are moved so as to overlap each other by the above-mentioned predetermined assembly force. Assembly tolerances can be overcome by providing separate elastic members 80A, 80B so that the overall length is contracted and the overall length is expanded and restored when the assembly force is removed. However, since the terminal portion 40 is provided so as to be separated into the one side terminal 50 and the other side terminal 60, there is a risk that the electrical flow will be interrupted when the terminal portion 40 is moved so as to overlap with each other. Either one of the terminals 60 and 60 on the other side may be required to be made of an elastic body, or other shape changes may be required to add side tension.

Here, the term "side tension" refers to the tension between the one side terminal 50 and the other side terminal 60 in order to prevent the electrical flow from being interrupted between the one side terminal 50 and the other side terminal 60, as described above. It can be defined as a force that is transmitted from one of them to the other in a direction different from the longitudinal direction.

On the other hand, due to the characteristics of the antenna device, when designing the above-mentioned shape change of the terminal section 40, it is necessary to also perform the impedance matching design within the above-mentioned terminal insertion opening 25. The detailed description of the embodiment will be described on the premise that the impedances within the terminal insertion port 25 are matched. Therefore, among the configurations of the embodiment of the cavity filter according to the present invention, which will be explained based on the drawings below FIG. The configuration geometry may take different shapes depending on the impedance matching design.

As shown in FIGS. 4 to 8b, the cavity filter 20 according to an embodiment of the present invention is provided at a predetermined distance from an external member 8 provided with electrode pads (not shown in the drawings) on one surface. This electrically connects the RF signal connecting part and the electrode pad of the external member 8 to the RF signal connecting part, which can eliminate assembly tolerances that exist at a predetermined distance, and also allows the connection between the electrode pad and the resonant element to be resolved. A terminal portion 40 having a structure that can prevent electrical flow from being interrupted is included.

Here, as shown in FIG. 2, the external member 8 is an antenna board on which an antenna element is arranged on the other side, or an amplifier (Power Amplifier, PA), a digital board, and a TX Calibration. This is a term that collectively refers to any one of the PCB boards that are integrated into one board.

In the following, as shown in FIG. 3, the external structure constituting the embodiment of the cavity filter 20 according to the present invention will not be divided into a first case and a second case, but will be summarized as a filter main body 21 provided with a terminal insertion port 25. It is designated by reference numeral 21 in the drawings. The filter body 21 may be made of a dielectric material that is easy to design for internal impedance matching (see reference numeral 70 in FIGS. 7a and 7b). Preferably, it may be made of Teflon (registered trademark) material.

The filter body 21 may be provided with a hollow terminal insertion opening 25, as shown in FIGS. 4 to 8b. The terminal insertion opening 25 may have a shape suitable for impedance matching design.

Grooving can be formed in the washer installation part 27 on one surface of the filter body 21, particularly on one surface of the side of the terminal section 40, which will be described later, on which one side terminal 50 is provided. The washer installation portion 27 should be grooved to have a larger inner diameter than the terminal installation hole 77 so that the outer edge of a star washer 90, which will be described later, is locked and prevented from coming off upward. I can do it.

Note that the cavity filter 20 according to the first embodiment of the present invention may further include a star washer 90 installed and fixed in the washer installation part 27.

The star washer 90 has a ring-shaped fixed end 91 fixed to the washer installation part 27, and a large number of star washers formed to be inclined upward from the fixed end 91 toward the center of the electrode pad side of the antenna board or PCB board 8. 92.

When an assembler assembles an embodiment of the cavity filter 20 according to the present invention to the antenna board or the PCB board 8, the star washer 90 is used to apply a fastening force by a fastening member (not shown) through the above-mentioned assembly hole 23. On the other hand, the plurality of support ends 92 can be supported on one surface of the antenna board or PCB board 8 and can apply elastic force. The addition of elastic force of the plurality of support ends 92 serves to eliminate assembly tolerances that exist between the antenna board or PCB board 8 of one embodiment of the cavity filter 20 according to the present invention.

However, as described later, the assembly tolerance absorbed by the star washer 90 exists within the terminal insertion opening 25, and is a concept that is distinguished from the assembly tolerance absorbed by the terminal portion 40. That is, the cavity filter according to an embodiment of the present invention is designed such that the overall assembly tolerance is absorbed in at least two places by separate members in a single assembly process, thereby making it more stable. It is possible to make connections.

In the cavity filter 20 according to an embodiment of the present invention, the terminal portion 40 includes one side terminal 50 that is in contact with an electrode pad of the external member 8, and an RF signal connection portion, as shown in FIGS. 4 to 8b. As shown in FIG. However, the other side terminal 60 does not necessarily have to be directly connected to the RF signal connection part by solder, but can also be connected to another conductive member to be electrically connected.

Here, either one of the one-side terminal 50 and the other-side terminal 60 is inserted into the inside of the other, and when assembled, they are arranged so that a portion of each end overlaps each other by a predetermined length. can be done.

The cavity filter 20 according to an embodiment of the present invention may have a structure in which the upper side of the other side terminal 60 is inserted under the one side terminal 50 in the drawings (see especially FIGS. 7A and 7B). To this end, the lower end of the one side terminal 50 may be provided in the form of a hollow tube with a hollow interior so that the upper end of the other side terminal 60 may be inserted therein.

When the terminal section 40 composed of the one-side terminal 50 and the other-side terminal 60 is installed in the terminal insertion opening 25, a wire is inserted so as to surround the outside of the terminal section 40 for impedance matching within the terminal insertion opening 25. A dielectric body 70 made of a dielectric material can be inserted.

The dielectric body 70 may be made of Teflon (registered trademark) material. However, the material of the dielectric body 70 is not limited to Teflon, and any material can be used as a substitute as long as it has a dielectric constant that allows impedance matching within the terminal insertion opening 25.

The dielectric main body 70 has a hollow space in which the center portion communicates vertically, and can substantially form a terminal installation hole 77 in which a terminal portion 40, which will be described later, is installed.

The dielectric body 70 includes a lower internal dielectric 73 integrally injection molded with the other side terminal 60 of the terminal section 40 and an upper internal dielectric body integrally injection molded with the one side terminal 50 of the terminal section 40. 72.

The lower internal dielectric 73 may be formed with a terminal through hole 73a through which the other terminal 60 passes, which is formed when the other terminal 60 and the other terminal 60 are integrally injection molded. Similarly, the upper inner dielectric 72 may be formed with a terminal through hole 72a, which is formed when integrally injection molded with the one side terminal 50, and through which the one side terminal 50 passes.

The upper internal dielectric 72 is formed to surround and support a part of the outer peripheral surface of the one side terminal 50, and the lower internal dielectric 73 is formed to surround and support a part of the outer peripheral surface of the other terminal 60. It can be configured to support.

However, it is not always necessary to manufacture the dielectrics 72 and 73 by injection molding integrally with the terminal 50 on one side and the terminal 60 on the other side of the terminal part 40.

That is, the upper internal dielectric 72 and the lower internal dielectric 73 may be assembled by being separately molded to have the terminal through holes 72a and 73a, respectively, and then inserted into the terminal installation holes 77.

Here, the upper internal dielectric body 72 is arranged so that impedance matching is performed within the terminal insertion opening 25, and in this case, the upper internal dielectric body 72 is arranged in the vertical direction with respect to the lower terminal 60 fixed so as to correspond to the one side terminal 50. It is preferable that the dielectric body 70 be provided separately from the dielectric body 70 so as to be able to move freely. Further, the lower internal dielectric body 73 is arranged so that impedance matching is performed within the terminal installation hole 77, and at this time, the lower internal dielectric body 73 is in contact with the dielectric body 70 so that the other side terminal 60 can be easily fixed. You can prepare accordingly.

The combination of dielectric body 70, lower inner dielectric 73, and upper inner dielectric 72 described above can be individually designed to be suitable for overall impedance matching within the filter body 21.

Meanwhile, in the dielectric body 70 , a second elastic member installation end 74 may be formed above the terminal installation hole 77 . The second elastic member installation end 74 is formed in a step shape so as to be larger than the diameter of the peripheral terminal installation hole 77, and the edge portion of the second elastic member 80A among the elastic members 80 described below is installed and supported. It can be formed as follows. In the following description, for convenience, the space in which the lower end of the one-side terminal 50 is located is defined as the terminal installation groove 76. If the second elastic member installation end 74 refers to a portion formed in a step shape that is smaller than the terminal installation groove 76, on the contrary, the terminal installation groove 76 is formed in a step shape that is larger than the second elastic member installation end 74. It can be defined as referring to the part formed in

On the bottom surface of the second elastic member installation end 74, a lower support end 85b of an elastic member 80B according to another embodiment of elastic members 80A and 80B, which will be described later, can be installed in contact with the bottom surface of the second elastic member installation end 74. This will be explained in more detail later.

In addition, in a portion of the terminal installation hole 77 corresponding to a position higher than the bottom surface of the terminal installation groove 76, a first elastic member is installed which is formed in a stepped shape so that the diameter is larger than the diameter of the second elastic member installation end 74. An edge 78 can be formed. At the first elastic member installation end 78 here, an elastic member 80A according to one embodiment of elastic members 80A and 80B, which will be described later, can be installed. This will also be explained in more detail later.

9 is a perspective view showing one embodiment of the elastic member in the configuration of FIG. 4, and FIG. 10 is a perspective view showing another embodiment of the elastic member in the configuration of FIG. 11 is a perspective view showing a modification of one embodiment of the elastic member in the configuration of FIG. 9; FIG. 11 is a perspective view showing another embodiment of the elastic member in the configuration of FIG. 4; FIG. FIG. 12 is a partial cross-sectional view of FIG. 3 with the elastic member of FIG. 11 interposed therebetween.

As shown in FIGS. 5 to 12, the cavity filter 20 according to an embodiment of the present invention has a part of the edge supported by the dielectric body 70 and is supported so as to penetrate through the hollow parts 81a and 81b. The terminal further includes elastic members 80A and 80B that elastically support the terminal portion 40 by vertically deforming the hollow portions 81a and 81b relative to a portion of the edge when an assembly force is transmitted to the terminal portion 40. I can do it.

Here, the elastic members 80A and 80B may be made of one of beryllium copper (BeCu), SUS, and spring steel. Among commonly used materials for the elastic members 80A and 80B, silicone material may be used. However, silicone material deteriorates in elasticity due to a predetermined compressive strain after a long period of use, and this reduces the long-term reliability of the cavity filter. It has been pointed out that there is a problem of a decline in sexuality.

In the cavity filter 20 according to an embodiment of the present invention, the material of the elastic members 80A and 80B is not a general silicone material, which has low elasticity itself, but can be used for a long period of time with less decrease in compressive strain. Therefore, in order to ensure long-term reliability, it is made of one of beryllium copper, SUS, and spring steel as described above.

As shown in FIGS. 9 and 10, the elastic members 80A and 80B have a disk-shaped hollow portion 81a, a large number of outer edge portions 84a supported by the first elastic member installation end 78, and a terminal. The first elastic member 80A may include a plurality of inner edge portions 85a to which the one side terminals 50 of the portion 40 are locked.

As shown in FIG. 9, the first elastic member 80A has an outer cutout 82a formed by cutting an outer edge 84a and an inner edge 85a by a predetermined length from the outer peripheral surface toward the hollow portion 81a. , and an inner cutout 83a extending from the hollow part 81a toward the outer peripheral surface by a predetermined length.

Therefore, the plurality of outer edges 84a are separated from each other by the plurality of outer cutouts 82a, the plurality of inner edges 85a are separated from each other by the plurality of inner cutouts 83a, and the first elastic member 80A is The outer edge 84a and the inner edge 85a may be connected to each other to form a zigzag ring shape.

When the assembly force is transmitted through the one side terminal 50 of the terminal portion 40 supported by the first elastic member 80A formed in this way, the outer edge 84a supported by the second elastic member installation end 74 The inner edge portion 85a elastically deforms downward with reference to the inner edge portion 85a, and elastically supports the terminal portion 40.

That is, as shown in FIG. 7a, the outer edge 84a and the inner edge 85a of the first elastic member 80A function as connecting portions that connect them, when no external force such as assembly force is transmitted. When the terminal part 40 is supported in a parallel state and an external force such as a predetermined assembly force is transmitted to the first elastic member 80A, as shown in FIG. 40 and moves downward, which is the direction in which the assembly force is applied, and the terminal part 40 is deformed so that the connecting part connecting the outer edge 84a and the inner edge 85a is inclined inwardly downward. It provides elastic support.

However, in the cavity filter 20 according to an embodiment of the present invention, the first elastic member 80A should not be limited to the shapes shown in FIGS. 7a and 7b and FIG. 9.

That is, as shown in FIGS. 8a, 8b, and 10, the first elastic member 80A is bent such that the portion corresponding to the outer edge 84a is bent outward at a predetermined angle with respect to the inner edge 85a. can be formed into By making the support surfaces of the outer edge 84a and the inner edge 85a offset from each other, the support surfaces of the outer edge 84a and the inner edge 85a are offset from each other. This is to add elastic force.

However, since the modified example of the first elastic member 80A is formed by bending the outer edge 84a with respect to the inner edge 85a, cracks may occur at the bent portion when the elasticity is repeatedly used. It is required that there be no occurrence of any defects or changes in the overall dimensions.

As shown in FIGS. 8a and 8b, the filter body 21 realized by a modification of the first elastic member 80A is brought into close contact with the electrode pad of the external member 8 to provide a predetermined assembly force. Then, a strong supporting force for the first elastic member installation end 74 can be ensured by the bent outer edge 84a.

On the other hand, as shown in FIG. 11, the elastic member has a disk-shaped hollow part 81b, and is provided with a large number of lower support ends 85b so as to be supported by the second elastic member installation end 74. An elastic part (not shown in the drawing) and a boss part 84b extending below the elastic part so as to surround the outer peripheral surface of one side terminal 50 of the terminal part 40 penetrating through the hollow part 81b. A second elastic member 80B may be further included.

As shown in FIG. 11, the second elastic member 80B includes a large number of inner elastic cutouts 83b formed by vertically cutting the outer side of the hollow part 81b along the circumferential direction, and a plurality of inner elastic cutouts 83b. It can be elastically deformed by a large number of outer elastic cutouts 82b formed by cutting the outer side vertically along the circumferential direction.

When assembly force is transmitted through the one side terminal 50 of the terminal portion 40 supported by the second elastic member 80B formed in this way, the edge of the elastic portion supported by the first elastic member installation end 74 The inner edge portion where the hollow portion 81b is located is elastically deformed downward and elastically supports the terminal portion 40 based on the portion.

Due to the elastic supporting action of the elastic members 80A and 80B, when the contact portion 53, which is the tip of the one side terminal 50 of the terminal portion 40, is brought into close contact with the electrode pad side of the external member 8 and assembled, the terminal After being elastically deformed so as to eliminate the assembly tolerance existing in the insertion opening 25, the one terminal of the terminal part 40 is arranged such that the contact part 53 of the one terminal 50 is continuously brought into contact with the electrode pad. It serves to provide elasticity to the material.

On the other hand, in the one-side terminal 50, it is preferable that the contact area of the contact portion 53 that contacts the antenna board or the PCB board 8 is as small as possible. Therefore, the contact portion 53, which is the tip of the one-side terminal 50, can be formed into a conical shape whose width gradually becomes narrower toward the top, as shown in FIGS. 4 to 12.

When the one-side terminal 50 is brought into contact with the electrode pad of the external member 8 through the contact portion 53 that is the tip thereof, and an assembling force is applied by the assembler, the elastic members 80A and 80B move the one-side terminal 50 into the terminal insertion opening. 25 so as to be movable in the vertical direction in the drawing.

Note that the lower end portion 52 of the one side terminal 50 into which the upper end portion of the other side terminal 60 is inserted may be provided with a large number of tension cutouts 55 that are formed long in the vertical direction. The tension cutout 55 may be formed so that the lower end 52 of the one-side terminal 50, which is provided in the form of a hollow tube, is divided into a plurality of parts.

The tension cutout 55 is operated to bring the lower end 52 of the one side terminal 50 into close contact with the outer circumferential side of the upper end 61 of the other side terminal 60 which is provided to be accommodated therein. It serves to add lateral tension. Here, since the dielectric main body 70 is provided so as to support the outer circumferential surface of the one-side terminal 50 in which the tension cut-out portion 55 is formed, the lower end of the one-side terminal 50 cut by the tension cut-out portion 55 The inner surface of the terminal 52 is always in close contact with the outer circumferential surface of the upper end 61 of the other terminal 60 housed therein.

By applying side tension by the tension cutout 55, it is possible to prevent the electrical flow from occurring in the two separated terminal portions 40 from occurring.

On the other hand, the tip of the other side terminal 60 of the terminal part 40 is provided with a sharp tip so that it can be easily inserted into the hollow tubular interior of the one side terminal 50, and the lower end of the other side terminal 60 is , can be fixed to the above-mentioned RF signal coupling part.

Therefore, when the other side terminal 60 moves downward due to the assembly force with its lower end fixed to the RF signal connecting portion, the lower end portion 52 of the one side terminal 50 is moved downward due to the assembly force. By expanding and contracting the vertical length of the terminal portion 40 as a whole while being inserted deeper inside, assembly tolerances existing within the terminal insertion opening 25 can be absorbed.

On the other hand, as shown in FIGS. 7a, 8a, 8b, and 12, when the one-side terminal 50 is not provided with any assembly force, the contact portion 53 is lower than the support end 92 of the configuration of the star washer 90. It can also be formed with a high protruding height.

The process of absorbing assembly tolerances by assembling the cavity filter 20 according to an embodiment of the present invention having such a configuration will be explained as follows with reference to the attached figures (particularly, FIGS. 6 and 9). be.

First, as shown in FIGS. 7a to 8b and 10, a cavity filter 20 according to an embodiment of the present invention is mounted on one surface of an external member 8, such as an antenna board or a PCB board, provided with electrode pads. After they are brought into close contact, a predetermined assembly force is transmitted to the cavity filter 20 by an operation in which a fastening member (not shown) is fastened to the assembly hole. However, it is not always necessary to have the cavity filters 20 in close contact with one side of the antenna board or PCB board 8; on the contrary, one side of the external member 8 such as the antenna board or PCB board is attached to the cavity filters 20 arranged at predetermined intervals. It is also possible to transmit the assembly force by bringing them into close contact.

Then, the distance between the antenna board or PCB board 8 and the cavity filter 20 according to an embodiment of the present invention is reduced, and at the same time, the support end 92 of the star washer 90 is deformed by the above-mentioned fastening force, and the present invention Assembly tolerances that exist between the cavity filter 20 and the antenna board or PCB board 8 according to one embodiment are primarily accommodated.

At the same time, one side terminal 50 of the terminal section 40 is held down by one surface of an external member 8 such as an antenna board or a PCB board so that it is moved a predetermined distance toward the other side terminal 60 within the terminal insertion opening 25. Due to the operation of being elastically supported by the elastic members 80A and 80B while being held, assembly tolerances existing in the terminal insertion opening 25 of the cavity filter 20 according to the first embodiment of the present invention are secondarily absorbed.

At this time, the one side terminal 50 and the other side terminal 60 are separated from each other by the tension cutout 55 provided at the lower end of the one side terminal 50, so that the one side terminal 50 and the other side terminal 60 are placed on the side with respect to the upper end of the other side terminal 60 inserted inside the hollow tubular shape. Since tension is applied, interruption of electrical flow can be prevented. Thereby, it is possible to prevent the signal performance of the cavity filter 20 according to the embodiment of the present invention from deteriorating.

The above description is merely an illustrative explanation of the technical idea of the present invention, and a person having ordinary knowledge in the technical field to which the present invention pertains will be able to understand the technical concept of the present invention without departing from the essential characteristics of the present invention. Various modifications and variations may be possible.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is limited by such embodiments. isn't it. The protection scope of the present invention should be interpreted in accordance with the attached claims, and all technical ideas within the scope equivalent to these claims should be construed as falling within the scope of rights of the present invention. Dew.

One embodiment of the present invention provides an assembly method that minimizes the cumulative amount of assembly tolerances that occur when assembling a large number of filters, and an RF signal coupling structure that is easy to implement and maintains uniform frequency characteristics of the filters. A cavity filter having a cavity filter is provided.

20 cavity filter, 21 filter body, 25 terminal insertion slot, 27 installation groove, 30 filter module, 31 RF signal connection section, 40 terminal section, 50 one side terminal, 60 other side terminal, 70 dielectric body, 72 upper internal dielectric body, 73 lower internal dielectric, 74
Second elastic member installation end, 77 Terminal installation hole, 78 First elastic member installation end, 80A, 80B
Elastic member, 81a, 81b hollow part, 82a outer incision, 83a inner incision, 84a outer edge, 85a inner edge.

Claims (9)

an RF signal connection section provided at a predetermined distance from an external member;
The external member and the RF signal connection part are electrically connected to each other, the assembly tolerance that exists at the predetermined distance is accommodated, and the electrical flow between the external member and the RF signal connection part is controlled. a terminal portion that prevents disconnection;
a dielectric body inserted into the terminal insertion hole so as to surround the outside of the terminal portion;
an elastic member whose edge is partially supported by the dielectric body and elastically supports the terminal portion;
A cavity filter in which the terminal portion includes at least two members, and a portion of one of the two members is inserted into a portion of the other member. The cavity filter according to claim 1, wherein the terminal portion is inserted into a terminal insertion opening formed in a filter body in which the RF signal connection portion is provided, through the dielectric body. The dielectric body is
an upper internal dielectric body provided to surround a part of the outer peripheral surface of one side terminal passing through the terminal installation hole provided in the hollow space; and a part of the outer peripheral surface of the other side terminal passing through the terminal installation hole. 3. The cavity filter of claim 2, including a lower internal dielectric surrounding the cavity filter. The terminal portion is
one side terminal that contacts the electrode pad of the external member;
The cavity filter according to claim 1, further comprising a second terminal connected to the RF signal connection part. The terminal portion is inserted through the dielectric body into a terminal insertion opening formed in a filter body in which the RF signal connection portion is provided,
The terminal portion is
one side terminal that contacts the electrode pad of the external member;
the other side terminal connected to the RF signal connection part,
The cavity filter according to claim 1, wherein a washer installation part is grooved in one surface of the filter main body on the side where the one side terminal is provided , and a star washer is installed and fixed in the washer installation part. 6. The cavity filter according to claim 5, wherein the washer installation portion is grooved to have a larger inner diameter than a terminal installation hole provided in a hollow space in the dielectric body. The cavity filter according to claim 4, wherein one of the one-side terminal and the other-side terminal is provided with a plurality of tension cutouts that are vertically elongated. 5. The cavity filter according to claim 4, wherein the contact portion of the one-side terminal that contacts the electrode pad among the terminal portions is formed in a conical shape whose upper end is curved to have a predetermined contact area. 5. The cavity filter according to claim 4, wherein the contact portion of the one-side terminal that contacts the electrode pad among the terminal portions is formed in a hemispherical shape whose upper end is curved to have a predetermined contact area.

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