WO2019151762A1

WO2019151762A1 - Cavity filter

Info

Publication number: WO2019151762A1
Application number: PCT/KR2019/001268
Authority: WO
Inventors: 김덕용; 장성호; 김정회
Original assignee: 주식회사 케이엠더블유
Priority date: 2018-01-31
Filing date: 2019-01-30
Publication date: 2019-08-08

Abstract

The present invention relates to a cavity filter and, particularly, to a cavity filter comprising: a resonance element including a coupling block; a first case including the resonance element therein; a second case arranged so as to cover one surface of the first case; a terminal unit penetrating the first case such that one end thereof is protrudingly provided so as to be connected to an electrode pad of an external member provided on the outside of the first case and the other end thereof is electrically connected to the coupling block of the resonance element provided to be close to the second case, wherein the terminal unit is electrically connected with the first case and electrically insulated from the first case; and an assembly unit provided on either one side or both sides in the lengthwise direction of the case, and having a terminal insertion hole in which the terminal unit is insertedly provided, wherein the assembly unit is formed to protrude to the outside from a lower surface of the first case.

Description

Cavity filter

The present invention relates to a cavity filter, and more particularly, to a cavity filter for a massive MIMO antenna in which the connector fastening structure between the filter and the printed circuit board is improved in consideration of assembly and size.

The contents described in this section merely provide background information on the present embodiment and do not constitute a prior art.

Multiple Input Multiple Output (MIMO) technology is a technology that dramatically increases the data transmission capacity by using multiple antennas. The transmitter transmits different data through each transmit antenna, and the receiver transmits different data through appropriate signal processing. Spatial multiplexing technique to distinguish. Therefore, as the number of transmit / receive antennas is increased at the same time, the channel capacity increases to allow more data to be transmitted. For example, if you increase the number of antennas to 10, you get about 10 times the channel capacity using the same frequency band compared to the current single antenna system.

4G LTE-advanced uses up to 8 antennas. Currently, products with 64 or 128 antennas are being developed in the pre-5G phase, and base station equipment with a much larger number of antennas is expected to be used in 5G. This is called Massive MIMO technology. While current cell operation is 2-Dimension, 3D-Beamforming is possible when Massive MIMO technology is introduced, so Massive MIMO technology is also called FD-MIMO (Full Dimension).

In Massive MIMO technology, as the number of antenna elements increases, the number of transceivers and filters increases accordingly. In addition, as of 2014, more than 200,000 base stations are installed nationwide. That is, there is a need for a cavity filter structure that minimizes mounting space and is easy to mount, and requires an RF signal line connection structure to provide the same filter characteristics even after individually tuned cavity filters are mounted on an antenna. The RF filter having a cavity structure has a resonator composed of a resonator rod which is a conductor inside a box structure formed of a metallic conductor, so that only an electromagnetic field having a natural frequency exists so that only a characteristic frequency of ultra high frequency passes by resonance. The bandpass filter of the cavity structure has a low insertion loss and is advantageous for high power, and thus is widely used as a filter of a mobile communication base station antenna.

The present invention has a main purpose to provide a cavity filter having a slimmer and more compact structure and the RF connector is embedded in the thickness direction in the body.

In addition, an object of the present invention is to provide an assembly method that can minimize the accumulation amount of the assembly tolerance occurring when assembling a plurality of filters and an RF signal connection structure that is easy to mount and maintains the frequency characteristics of the filter uniformly. .

In order to solve the above problems, a resonance element including a coupling block; A first case including the resonating element therein, a second case disposed to cover one surface of the first case, and an electrode pad of an external member provided at an outside of the first case through one end of the first case It is provided to be connected to the projecting, the other end is electrically connected to the coupling block of the resonance element provided in close proximity to the second case side, the terminal portion electrically insulated from the first case, and the length of the first case It is provided on any one side or both sides of the direction, and includes an assembly portion formed with a terminal insertion hole is inserted into the terminal portion, the assembly portion is formed to protrude to the outside of the lower surface of the first case.

Here, the terminal insertion hole is formed such that at least a portion of the first case is recessed from the lower surface of the first case or extends from the first case to the PCB board side, and the terminal part is disposed inside the terminal insertion hole and once A pin member connected to a coupling block of the resonator element and the other end connected to the PCB board side; And a terminal body through which the pin member penetrates and is installed in the terminal insertion hole together with the pin member, and accommodates an elastic member for adding an elastic force to the pin member.

In addition, a pin connector may be provided inside the terminal body to be elastically supported by the elastic member toward the PCB board.

In addition, the pin connector, the front end may be further protruded to the outside of the terminal insertion port by the elastic member.

The terminal insertion hole may include a first insertion hole formed with a relatively wider inner diameter of the side where the PCB board is provided, and a second insertion hole formed with a smaller inner diameter than the first insertion hole. It may further include a dielectric bush to be inserted.

The terminal head block may further include a terminal head block coupled to the terminal body and seated on the first insertion opening.

The apparatus may further include a ground ground terminal electrically connected to the first case, and the first case may include an annular recess surrounding the first insertion hole to have an installation surface on which the ground ground terminal is installed. have.

In addition, the annular groove is formed in an annular dovetail shape so that the diameter of the circumferential surface corresponding to the inner diameter increases in the depth direction, and the inlet inner diameter of the annular groove is retracted by elasticity of the ground ground terminal. Inserted into the annular groove, it can be formed with a minimum diameter that can prevent the departure.

In addition, the ground ground terminal, a plurality of fixed ring portion which is seated and fixed to the installation surface of the annular groove and formed in the circumferential direction at the inner circumferential end of the fixing ring portion extending toward the center, the plurality of inclined toward the PCB board side Two elastic ground portions.

In addition, the terminal insertion hole, the first insertion hole is formed with the inner diameter of the side having the PCB board is the most wide, the inner diameter is relatively smaller than the second insertion hole and the third insertion hole formed relatively smaller than the first insertion opening It may further include a dielectric insert which is formed in a two-stage cylindrical shape, the third insertion hole, comprising a small insertion hole in the second insertion hole and the third insertion hole.

The terminal unit may include a pin member disposed inside the terminal insertion hole, one end of which is connected to the resonating element and the other end of which is connected to the PCB board side; The pin member further includes: a pin part positioned over the second insertion hole and the third insertion hole to be connected to the resonance element as the one end; A terminal body part which is formed in the form of a two-stage cylinder integral with the pin part, and has a socket part having a cone-shaped opening therein and positioned over the first insertion hole; And an elastic connector fixedly inserted into the socket and connected to the PCB board as the other end. It may include.

In addition, the elastic connector, a cylindrical structure inserted into the socket portion, a truncated conical pin socket contact portion inserted corresponding to the cone-shaped opening portion and an impedance matching portion extending from the pin socket contact portion, Can be.

In addition, the elastic connector is inserted into the socket portion, provided with contact with the PCB board side, the circular spring portion and the circular spring portion formed to have a constant vertical section of a circular portion except for both ends of the circular shape It may include two plate-like protrusions, which are formed to project perpendicular to the circumference from two points adjacent to the column.

The present invention can reduce the size of the antenna system by providing a cavity filter of a slim and compact structure in which the RF connector is built in the thickness direction in the body, and can perform the verification of the individual cavity filter quickly and with high reproducibility, There is an effect that can be easily mounted a plurality of cavity filters inside the mobile communication base station antenna.

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

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

3 is a perspective view showing the structure of a cavity filter according to an embodiment of the present invention.

4 is a plan view illustrating a structure in which a terminal part of the first embodiment is employed in the configuration of a cavity filter according to an embodiment of the present invention.

FIG. 5 is an exploded perspective view illustrating a structure in which a terminal part of the first embodiment is employed in the configuration of a cavity filter according to an embodiment of the present invention.

6 is a cross-sectional view and an enlarged view illustrating a cavity filter employing a pin member terminal unit according to an exemplary embodiment of the present invention.

7 is a partial cutaway perspective view showing an installation state of an assembly of a pin member type terminal unit according to an exemplary embodiment of the present invention.

8 is a cross-sectional view illustrating a terminal part structure of a cavity filter employing a push pin type elastic connector according to an exemplary embodiment of the present invention.

9 is a side cross-sectional view illustrating a terminal part structure of a cavity filter employing a push pin type elastic connector according to an exemplary embodiment of the present invention.

FIG. 10 is a partial cross-sectional view of a terminal part structure of a cavity filter employing a push ring type elastic connector according to another exemplary embodiment of the present invention.

1, 5: antenna unit 11: heat sink

12: power supply unit (PSU) 13: PCB board

14: cavity filter 15: antenna board

16: multiple antenna 17: radome

18: cavity filter 20: terminal portion

80: first case 81: second case

84: assembly portion 86: lower surface

88: bottom surface of the first case 110: terminal insertion opening

112: first insertion opening 114: second insertion opening

131: terminal body 132: pin member

133: separation prevention cap 150: elastic member

160: ground terminal 170: annular groove

210: terminal insertion opening 212: first insertion opening

214: second insertion opening 216: third insertion opening

220,222: dielectric bush 230: pin member

232: pin portion 234: terminal body portion

235: protrusion 236: socket portion

237: first annular groove 238: opening

240: elastic connector 242: annular projection

244: pin socket contact portion 246: impedance matching portion

248: incision 249: electrode corner

250: elastic member 260: ground terminal

270: annular groove 310: terminal insertion hole

312: first insertion opening 314: second insertion opening

316: third insertion hole 320: dielectric bush

322: first bush 324: second bush

326,328 through-hole 330 pin member

332: pin portion 334: terminal body portion

335: protrusion 336: socket

338: opening 340: elastic connector

342: plate-shaped protrusion 344: circular spring portion

346: two points 360: ground terminal

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. Throughout the specification, when a part is said to include, 'include' a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated. . In addition, as described in the specification. The terms 'unit' and 'module' refer to a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

Referring to FIG. 1, the antenna device 1 includes a housing (not shown) in which a heat sink 11 is formed, and a radome 17 coupled to the housing. Inside the housing is an antenna assembly. A power supply unit (PSU) 12 is coupled to the lower portion of the housing, for example, via a docking structure, and the power supply unit 12 is an operating power source for operating electronic components included in the antenna assembly. To provide.

In general, an antenna assembly has a cavity filter 14 disposed on the back of an antenna board 15 in which a plurality of antennas 16 are arranged in front, and the number of antennas 16 is associated with the PCB board 13. It has a laminated structure. The cavity filter 14 is carefully tuned and verified to have frequency characteristics that are individually matched prior to mounting. It is desirable that the tuning and verification process be done quickly in an environment with the same characteristics as the mounted state.

Referring to FIG. 2, unlike the stacking structure of the exemplary Massive MIMO antenna referenced in FIG. 1, the conventional RF connectors 14-1 and 14-2 are excluded, thereby facilitating the connection and providing a lower height profile. It is possible to provide an antenna structure 5 having. In addition, the RF connection is provided on both sides of the height direction, provided by the terminal unit 20 of the various embodiments described later, even if the vibration and thermal deformation occurs in the antenna board 15 or the PCB board 13, the RF connection remains the same. There is an advantage that there is no change in frequency characteristics.

3 is a perspective view showing the structure of a cavity filter according to an embodiment of the present invention, Figure 4 is a plan view showing the structure of the terminal portion of the first embodiment of the configuration of the cavity filter according to an embodiment of the present invention, FIG. 5 is an exploded perspective view illustrating a structure in which a terminal part of the first embodiment is employed in the configuration of a cavity filter according to an embodiment of the present invention, and FIG. 6 is a pin member type terminal part according to an embodiment of the present invention. 7 is a cross-sectional view and an enlarged view illustrating a cavity filter, and FIG. 7 is a partially cutaway perspective view illustrating an installation state of an assembly of a pin member type terminal unit according to an exemplary embodiment of the present invention.

3 to 5, the cavity filter 18 according to an exemplary embodiment of the present invention may include a first case in which a hollow, which is an empty space, is formed and a plurality of resonating elements 83 are arranged in the hollow. 80), the

second case

81 and 82 provided as a cover covering the first case 80, and the terminal part 20 provided in the height direction of the cavity filter 18 on both sides in the longitudinal direction of the first case 80. It includes. The terminal portion 20 penetrates the upper or lower surface of the first case 80 to connect the electrode pad (not shown) of the external member such as the PCB board 13 or the antenna board 15 to the resonance element 83. The coupling block 85 provided is electrically connected.

More specifically, the first case 80 may be provided to open one side (upper side in the drawing), and the

second cases

81 and 82 may be provided to cover one side of the opened first case 80. .

Meanwhile, as shown in FIG. 5, the

second cases

81 and 82 are provided inside the cover panel 81 and the cover panel 81 provided to cover one side of the first case 80. The support panel 82 may include a support hole 82a formed to support a flat plate of the resonance element 83, which will be described later.

The

second cases

81 and 82 may have a structure coupled to the first case 80 by laser welding, soldering, or the like, and may be coupled in a screw coupling manner by a fixing screw (not shown). .

The first case 80 and the

second case

81, 82 may be made of a material such as aluminum (alloy), and silver or copper may be plated on at least a surface forming a hollow to improve electrical characteristics. have. In addition, the resonator element 83 installed in the hollow formed by the first case 80 and the

second case

81 and 82 may also be made of a material such as aluminum (alloy) or iron (alloy), and may include silver or It may be plated with copper material.

The hollows formed in the first case 80 are provided with cavity structures in which a plurality of resonating elements 83 are accommodated, respectively, and the cavity structures are interconnected in the hollows so that the plurality of resonating elements 83 can be connected in multiple stages. A coupling window, which is a connecting passage structure for connecting, may be formed. The coupling window may be formed in such a manner that some portions of the partition walls of the cavity structure are removed to a predetermined size.

Meanwhile, an assembly unit 84 may be formed at one end of the first case 80 and the other end of the first case 80 such that the terminal unit 20 provided as the input terminal 20a and the output terminal 20b is installed. The assembly unit 84 may be provided in the form of a through hole penetrating in the open one side direction of the first case 80 or the other side direction opposite thereto.

Both side assembly portions 84 including the terminal portions 20 of the first case 80 and the

second case

81 and 82 have a structure formed thicker than the lower surface 86 which is an area therebetween depending on the application. Can have For example, when the lower surface 86 corresponding to the other direction of the first case 80 is assembled to the PCB board 13 on which various elements are mounted, a height for avoiding interference with the mounted element (FIG. 5 is illustrated in FIG. 5). Reference numeral “D”) may be provided by either side or one side assembly 84. In the cavity filter according to an embodiment of the present invention, the assembling unit 84 including the terminal unit 20 of the first embodiment is provided at one side of the first case 80 in the longitudinal direction, and the PCB board 13 is It is adopted to be formed thicker in the other direction, which is the provided side.

As shown in FIG. 5, the external terminal exposing direction of the terminal unit 20 may be formed such that one side thereof faces the lower surface 88 of the first case 80 and the other side thereof protrudes from the assembly reference surface of the second case 81. According to the mounting form of the cavity filter 18, the external terminal exposing direction of the terminal part 20 may be formed to have the same direction with respect to the lower surface 86 of the first case 80, for example.

Example 1

A first embodiment of the present invention is a cavity filter 18 used in a base station antenna for mobile communication and installed on an outer member, which is disposed on an outer member and has a resonating element 83 and a coupling block 85 connected therein. 1 through the first case 80, the first case 80 including the electrical connection between the electrode pad of the outer member and the coupling block 85 of the resonator element 83, the first case 80 And a terminal portion 20 which is electrically insulated from the terminal portion 20. Hereinafter, the terminal unit 20 will not be divided into the input terminal 20a and the output terminal 20b, but will be used in a generic concept.

Here, the terminal portion 20 is recessed at least a portion from the bottom surface 86 of the first case 80 into the first case 80 or extends from the first case 80 to the associated PCB board 13 side. A pin inserted in the terminal insertion hole 110 and a coupling block 85 extending from the resonator element 83 and having the other end connected to the associated PCB board 13 side. A terminal body through which the member 132 and the pin member 132 penetrate and is installed in the terminal insertion hole 110 together with the pin member 132, and accommodates the elastic member 150 for applying an elastic force to the pin member 132. 131 may be included.

Meanwhile, as shown in FIG. 4, the terminal insertion hole 110 may include a first insertion hole 112 and a first insertion hole formed with a relatively wider inner diameter of a side on which the associated PCB board 13 or the outer member is provided. The second insertion hole 114 may be formed to have a smaller inner diameter than that of 112.

Here, a guide part 133 having an outer diameter greater than that of the terminal body 131 and the pin member 132 may be formed between the terminal body 131 and the pin member 132.

The guide part 133 serves to stably fix the terminal body 131 and the pin member 132 inside the second insertion hole 114 of the terminal insertion hole 110. That is, although not shown in the drawings, the female thread is formed on the inner circumferential surface of the second insertion hole 114 of the terminal insertion hole 110, and the male thread is formed on the outer circumferential surface of the guide part 133, and thus the terminal insertion hole of the terminal part 20 is formed. Since the screw coupling is possible at the time of installation, the assembly is improved, as well as the stable installation is possible.

The end of the associated PCB board 13 side of the terminal body 131 for the screwing of the terminal portion 20 to the terminal insertion hole 110 is a spanner into the space exposed through the first insertion hole 112 of the terminal insertion hole 110. It may be formed to have a hexagonal cross section to be assembled using an assembly tool such as.

Meanwhile, the inside of the terminal body 131 is elastically supported by the elastic member 150 to be always in contact with the electrode pad formed on the associated PCB board 13 or the outer member side, as shown in FIGS. 5 to 7. The installed pin connector 140 may be provided.

The front end of the pin connector 140 may be provided to protrude a predetermined length toward the electrode pad side of the associated PCB board 13 or the outer member through the always assembled portion 84 by the elastic support of the elastic member 150. Therefore, when installing the cavity filter 18 according to an embodiment of the present invention between the associated PCB board 13 and the antenna board 15, the pin connector 140 which is elastically supported by the elastic member 150 and is movable. The clearance of the assembly designed for assembly can be eliminated by the moving distance of).

More specifically, the elastic member 150 is located inside the terminal body 131 of the pin member 132, so as to elastically support the pin connector 140 to the associated PCB board 13 or the outer member side. It may be provided. Here, the elastic member 150, as a spring, one end may be supported in the inner space of the terminal body 131, the other end may be supported by the inner end of the pin connector 140. The pin connector 140 may be provided to be supported by the inner surface of the terminal body 131 so as not to be separated out by the elastic support force of the elastic member 140.

Here, the first embodiment of the present invention may further include a dielectric bush (not shown) inserted into the first insertion hole 112. The dielectric may be provided to fill a space formed by the second insertion hole 114.

The cavity filter 18 according to the first exemplary embodiment of the present invention may further include a terminal head block 134 coupled to the terminal body 131 and seated on the first insertion hole 112. The terminal head block 134 serves to stably fix the terminal body 131 and the pin member 132, which are formed as a whole, in the terminal insertion hole 110.

A male thread may be formed on the outer circumferential surface of the terminal head block 134 as in the guide part 133 described above, and may be screwed to a female thread formed on the inner circumferential surface of the first insertion hole 112 among the terminal insertion holes 110. Do.

Meanwhile, the cavity filter 18 according to the first exemplary embodiment of the present invention may further include a ground ground terminal 160 electrically connected to the first case 80.

Here, an annular groove 170 surrounding the first insertion hole 112 may be formed in the first case 80 to have an installation surface on which the ground ground terminal 160 is installed.

The annular groove 170 may be formed in an annular dovetail shape in which a circumferential surface corresponding to an inner diameter is larger in a depth direction.

The annular groove 170 forming the installation surface on which the grounding terminal 160 is installed will be described in detail later by dividing it into the name 'second annular groove'.

As described above, the cavity filter according to the first exemplary embodiment of the present invention does not need to increase the size of the terminal insertion hole 110, and the pin is formed by maintaining the elastic force by the elastic member 150 properly. The impedance between the member 132 and the terminal insertion hole 110 may be kept constant.

Example 2

8 is a cross-sectional view illustrating a terminal part structure of a cavity filter employing a push pin type elastic connector according to an embodiment of the present invention, and FIG. 9 is a push pin type elastic type according to another embodiment of the present invention. It is a side sectional view which shows the structure of the terminal part of the cavity filter which employ | adopted a connector.

The terminal portion 20 of the cavity filter 18 according to the exemplary embodiment of the present invention may include a terminal insertion hole 210, a dielectric bush 220, a pin member 230, an elastic connector 240, and an elastic member 250. ) And a ground ground terminal 260.

The terminal insertion hole 210 has a cylindrical shape and is formed from the lower surface 86 of the first case 80 to penetrate the first case 80, or is formed from the upper surface of the first case 80. It may be provided through one case 80. When formed from the upper surface of the first case 80, the through holes are also formed in the second case (81, 82) and the depth of the terminal insertion hole 210 can be adjusted in consideration of this. The terminal insertion hole 210 may be formed in three stages to decrease the diameter in stages. The largest diameter is defined as the first insertion hole 212, followed by the second insertion hole 214, and the smallest diameter as the third insertion hole 216.

The

dielectric bushes

220 and 222 are in the form of two-stage cylinders and have a through hole 226 penetrating through the center thereof. The dielectric bush 220 is inserted into and fixed to the first insertion hole 212 and the second insertion hole 214 of the terminal insertion hole 210. The

dielectric bushes

220 and 222 may be made of Teflon material. In this embodiment, one body is disclosed as being configured in the form of a two-stage cylinder, but is not limited thereto, and may be assembled to have a two-stage cylinder form with different diameters.

The pin member 230 is in the form of a two-stage cylinder in which the pin portion 232 and the terminal body portion 234 are integrally formed in the longitudinal direction. In the present embodiment, the terminal body portion 234 is provided with a socket portion 236, the inside of which is hollow in a hollow form. The fin member 230 may be gold plated on a BeCu (Beryllium Copper) material. The pin portion 232 is inserted into and fixed to the through holes 226 of the

dielectric bushes

220 and 222. The outer circumferential surface of the pin portion 232 is formed with a wedge-shaped protrusion 235 so that the pin portion 232 does not fall in the opposite direction in which the pin portion 232 is inserted. The annular stepped portion formed at the boundary between the pin portion 232 and the terminal body portion 234 is assembled to abut one side of the

dielectric bushes

220 and 222. Particularly, the first dielectric 220 and the third insertion hole 216 of the terminal insertion hole 210 are provided so that the

dielectric bushes

220 and 222 occupy the second insertion hole 214 of the terminal insertion hole 210. When the second dielectric 222 is provided in the form of a two-stage cylinder, the annular stepped portion of the terminal body 234 may be assembled to be in close contact with the first dielectric 220.

The terminal body portion 234 is formed to be shorter than the depth of the third insertion hole 216, and as described above, a hollow socket portion 236 is formed inside, the cone-shaped opening of which diameter decreases inward from the inlet 238 is formed. In the present embodiment, the opening 238 may be, for example, inclined at an angle of 30 degrees with respect to the central axis. A first annular groove 237 is formed inside the opening 238 having a cone shape to prevent separation of the elastic connector 240 inserted therein. An elastic member 250 may be inserted between the innermost inner surface of the opening 238 and the tip of the insertion portion of the elastic connector 240 to further provide a force for pushing the elastic connector 240 out of the opening 238. have.

The elastic connector 240 extends from the pinned contact 244 and the pinsocket contact 244 having a cylindrical structure inserted into the socket 236 and a truncated conical shape inserted corresponding to the opening 238 of the cone shape. An impedance matching portion 246 is integrally formed in the longitudinal direction. The elastic connector 240 may be gold plated on the BeCu material. In the middle of the longitudinal direction of the cylindrical structure is formed an annular projection 242 of the wedge cross-sectional shape protruding from the outer peripheral surface. The annular protrusion 242 is accommodated in the first annular groove 237 when the elastic connector 240 is inserted into the socket 236 to prevent the elastic connector 240 from being separated from the socket 236.

The angle of the pin socket contact portion 244 is formed 5 degrees to 10 degrees larger than the angle of the cone-shaped opening portion 238 of the socket portion 236 with respect to the central axis. In addition, the elastic connector 240 has a cross-shaped cutout portion 248 is formed locally along the central axis from the outer surface exposed to the outside after being inserted into the socket portion 236. The depth of the incision 248 extends through the truncated cone shape to the cylindrical structure of the elastic connector 240. In the present embodiment, the cutout 248 is illustrated as a cross shape, but is not limited thereto, and may be formed in a straight shape or a plurality of slot shapes.

The length of the elastic connector 240 is in the cone-shaped opening 238 of the socket portion 236 in a state in which the elastic connector 240 is inserted into the socket portion 236 so that the cross-shaped cutout 248 is not retracted. When touched, it protrudes from the bottom surface 88 of the first case 80, and when the cavity filter 18 is mounted, the elastic connector 240 has a length to be inserted while pressing the opening 238 of the socket portion 236. Is formed.

The outer edge of the outer surface of the elastic connector 240 is an area electrically connected to the electrode pad formed on the PCB board 13 to which the cavity filter 18 is assembled while the elastic connector 240 is retracted. This outer edge is defined by the electrode edge 249. In one embodiment, the electrode corner 249 is formed in a round shape in the range of R0.1 to R0.5, even if the elastic connector 240 is retracted to form a shallow cone shape in which the outer surface is concave in the plane. 249 is provided to have a uniform contact area with the electrode pad formed on the PCB board (13). The cavity filter 18 is actually assembled with the PCB board 13 and may have various height deviations. Even if the elastic connector 240 is retracted by forming the electrode edges 249 in a round shape, the cavity filter 18 may be uniform. It can have one contact area.

The angle of the opening 238, the angle of the pin socket contact 244, the length of the elastic connector 240 and the round size of the electrode edge 249 may be defined by one side of the first case 80 or the second case 81. It is preferable to select based on when the assembly reference plane and the PCB board 13 are combined. In more detail, when the PCB board 13 is coupled, the elastic connector 240 is pushed up and slides along the opening 238 of the socket 236, and the cross-shaped cutout 248 is lifted up. When the cutout 248 is retracted, the angle of the pin socket contact portion 244 of the elastic connector 240 decreases, and the contact area between the opening 238 and the pin socket contact portion 244 changes. In addition, while the outer surface of the elastic connector 240 is retracted in the form of a shallow cone, the area where the electrode edge 249 is in contact with the electrode pad of the PCB board 13 is also changed. In addition, the elastic member 250 inserted into the socket 236 pushes the elastic connector 240 toward the PCB board 13 and the force including the reaction force from the pin socket contact 244 is applied to each contact. Each contact surface is elastically deformed.

Design specifications of the socket portion 236, the elastic connector 240 and the elastic member 250 to determine the contact area is preferably selected in consideration of the impedance of the terminal portion (20). That is, it is preferable to determine the design specification that the change of the impedance along the signal path of the terminal portion 20 including the contact resistance determined by the contact area and the contact pressure is minimized. In particular, in the case of a mobile communication antenna signal in which a high frequency is transmitted, the signal quality may be deteriorated if the characteristic impedance of the signal line is not constant. Impedance mismatching of the signal path in multi-gigahertz signals can increase the voltage standing wave ratio (VSWR), which can degrade signal quality due to signal reflection and distortion.

Consideration for maintaining the impedance of the terminal unit 20 uniformly is also necessary in selecting the size of the first insertion hole 212 to the third insertion hole 216 and the size of the terminal body portion 234. The third insertion hole 216 is spaced apart from the outer circumferential surface of the terminal body portion 234 with a predetermined air gap, and between the second insertion hole 214 and the third insertion hole 216 and the pin part 232. For example,

dielectric bushes

220 and 222 of Teflon material are mediated. The pin part 232 and the terminal body part 234 of the pin member 230 have a stepped diameter, and the diameter and the depth of the second insertion hole 214 are considered in this regard, the pin member 230 and the terminal insertion hole 210. It is preferable to select so that the impedance of the liver remains constant.

The dielectric constant of the Teflon material is about twice that of air. In consideration of this, the diameter of the first insertion hole 212 is larger than that of the second insertion hole 214 and the third insertion hole 216. For example, instead of Teflon, if the

dielectric bushes

220 and 222 are made of PEEK material having a dielectric constant about three times that of air, the diameter of the first insertion hole 212 is larger than that of Teflon.

9 (a) to 9 (d) illustrate the shapes of the electrode corners 249 and the impedance matching unit 246 of the elastic connector 240 in contact with the electrode pads of the PCB board 13 or the external member in various forms. It is. These shapes and sizes can be selected by performing numerical analysis in consideration of the distance from the first insertion opening 212, or by evaluating the VSWR of the terminal unit 20 using, for example, a network analyzer.

FIG. 9A illustrates an example in which the impedance matching part 246 protrudes vertically at a position away from the pin socket contact part 244, and the electrode edge 249 is an example in which a fine round of R0.1 is formed.

9B is an example in which the inclination angle of the pin socket contact portion 244 of the elastic connector 240 is maintained and extends to the electrode edge 249.

FIG. 9C illustrates a case in which the impedance matching unit 246 is formed to have an inclined surface that decreases in diameter again at a position away from the pin socket contact portion 244.

9 (d) has an inclined surface that decreases in diameter again at a position away from the pinsocket contact portion 244, and a relatively large round is formed at the electrode edge 249 of R0.5.

FIG. 9E illustrates a case in which the elastic member 250 is omitted, and a force (contact pressure) for pushing the electrode pads of the elastic connector 240 and the PCB board 13 in contact therewith has a cross shape of the elastic connector 240. It is an example showing the case where the cutout portion 248 is formed by the reaction force from the pin socket contact portion 244 as it is retracted.

On the outside of the first insertion opening 212, as described above, a second annular recess 270 is formed to surround the signal line, surround the cylindrical portion, and accommodate the ground ground terminal 260 inserted to securely connect the ground. Can be.

Example 3

10 is a partial cross-sectional view of a terminal portion structure of a cavity filter employing a push ring type elastic connector according to an embodiment of the present invention.

Referring to FIG. 10, the terminal unit 30 according to another embodiment of the present invention includes a terminal insertion hole 310, a dielectric bush 320, a pin member 330, a push ring type elastic connector 340, and a ground ground terminal ( 360).

In the present embodiment of FIG. 10, the impedance matching is more strictly performed. The dielectric bush 320 is formed in a separate type, and the diameters of the through

holes

326 and 328 of the two-stage

dielectric bushes

322 and 324 are different. Although the pin portion 332 of the 330 is formed in two stages corresponding to the dielectric bush 320, the terminal insertion hole 310, the dielectric bush 320, the pin portion 332, and the ground ground terminal 360 may be formed. It may be configured in the same form as the embodiment of FIG. That is, the terminal insertion hole 310 is, as in the second embodiment of the pin member method, as shown in Figs. 8 and 9, the first insertion opening 312 having the largest diameter, and the second insertion opening following it. 314 and the third insertion hole 316 having the smallest diameter, the dielectric bush 320 and the pin portion 332 can be installed in the same configuration as the installation configuration of the second embodiment.

More specifically, the pin member 330 according to the present embodiment includes a terminal body portion 334 in which the pin portion 332 and the socket portion 336 are formed. The pin member 330 may be gold plated on the BeCu material. The pin portion 332 is inserted into and fixed to the through

holes

326 and 328 of the dielectric bush 320. On the outer circumferential surface of the fin part 332, a wedge-shaped protrusion 335 is formed so that the pin member 330 does not fall in the opposite direction in which the pin member 330 is inserted. The annular stepped portion formed at the boundary between the pin portion 332 and the terminal body portion 334 is assembled to abut one side of the dielectric bush 320. More specifically, the first dielectric 322 disposed to occupy the third insertion hole 316 of the terminal insertion hole 310 as the dielectric bush 320 for impedance matching is divided into two stages (see reference numerals 322 and 324). And a second dielectric 324 disposed to occupy the second insertion hole 314 of the terminal insertion hole 210, the annular stepped portion between the pin part 332 and the terminal body part 334 may include a second dielectric ( 324). The terminal body portion 334 is formed shorter than the depth of the first insertion opening 312, the inside is hollow, and the opening of the cone shape 338 is reduced in diameter from the inlet to the inside. In one embodiment of the present invention, the cone-shaped opening 338 is formed to be inclined at an angle of 60 degrees with respect to the central axis, for example, on the outer circumferential surface of the circular spring portion 344 of the elastic connector 340 of the push ring method. It is formed to circumscribe.

The elastic connector 340 of the push ring type according to the present embodiment is formed from a spring plate having a predetermined width in most of its length except for both ends. The elastic connector 340 includes a circular spring portion 344 and two plate-like protrusions 342 projecting perpendicularly to the circumference from two points 346 adjacent to the circumference of the circular spring portion 344 on one side. The width of the elastic connector 340 is formed so that the plate-like protrusion 342 can be inserted into the socket 336. The elastic connector 340 may be formed of a BeCu material and may be gold plated, and the two plate-shaped protrusions 342 may be spaced apart from each other, and the circular spring part 344 may be deformed into an ellipse when an external force acts in the center direction thereof. It is formed to act as a leaf spring.

That is, when the two plate-like protrusions 342 of the elastic connector 340 are inserted into the socket portion 336, the two plate-like protrusions 342 are opened to each other so that the end portions of the two plate-like protrusions 342 are in close contact with the inner circumferential surface of the socket portion 336 to maintain the inserted state. Can be. Further, the circular spring portion 344 is in close contact with the outer surface of the circular spring portion 344 so as to be circumscribed, and the position opposite to the plate-shaped protrusion 342 is from the lower surface 88 of the first case 80. When the cavity filter 18 of the present embodiment is protruded by a predetermined distance, the pin member 330 and the electrode pad are electrically connected to each other while the electrode pad is elastically deformed into an ellipse shape as the electrode pad presses the circular spring part 344. It provides a sufficient contact pressure to press the contact area so that the contact state does not change even when external vibration is applied.

Cavity filter 18 according to an embodiment of the present invention provides a cavity filter (20) by providing an RF connection terminal portion 20 including

elastic connectors

240, 340, 440 formed so that the terminals are exposed on both sides or one surface of the height direction. The thickness of 18) can be reduced, making it possible to build a slimmer and more compact stacked MIMO antenna system.

The above description is merely illustrative of the technical idea of the present embodiment, and those skilled in the art to which the present embodiment belongs may make various modifications and changes without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of the present embodiment but to describe the present invention, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present embodiment.

Embodiments of the cavity filter according to the present invention can be used for a mobile communication base station antenna.

Claims

A resonance element including a coupling block;

A first case including the resonance element in the first case;

A second case disposed to cover one surface of the first case;

One end penetrates through the first case and is protruded so as to be connected to an electrode pad of an external member provided outside the first case, and the other end is connected to a coupling block of the resonator device provided near the second case side. A terminal portion electrically connected to and electrically insulated from the first case; And

An assembly unit provided on one side or both sides of the first case in a longitudinal direction and having a terminal insertion hole into which the terminal unit is inserted; Including,

The assembly unit, the cavity filter protruding to the outside of the lower surface of the first case.
The method according to claim 1,

The terminal insertion hole is formed so that at least a portion of the first case is recessed from the bottom surface of the first case or extends from the first case to the PCB board side,

The terminal portion,

A pin member disposed inside the terminal insertion hole, one end of which is connected to a coupling block of the resonance element and the other end of which is connected to the PCB board side; And

A terminal body through which the pin member penetrates and is installed in the terminal insertion hole together with the pin member, and accommodates an elastic member for adding an elastic force to the pin member; Including, the cavity filter.
The method according to claim 2,

A cavity filter is provided inside the terminal body such that the pin connector is elastically supported by the elastic member toward the PCB board.
The method according to claim 3,

The pin connector is a cavity filter, the front end is further protruded to the outside of the terminal insertion port by the elastic member.
The method according to claim 2,

The terminal insertion hole includes a first insertion hole formed with a relatively wider inner diameter of the side where the PCB board is provided, and a second insertion hole formed with a smaller inner diameter than the first insertion hole.

And a dielectric bush inserted into the second insertion opening.
The method according to claim 5,

A terminal head block coupled to the terminal body and seated at the first insertion opening; The cavity filter further comprising.
The method according to claim 5,

Further comprising a ground ground terminal electrically connected to the first case,

The first case, the cavity filter formed with an annular groove surrounding the first insertion opening to have an installation surface on which the ground ground terminal is installed.
The method according to claim 7,

The annular groove is formed in an annular dovetail shape so that the diameter of the circumferential surface corresponding to the inner diameter increases in the depth direction,

The inlet inner diameter of the annular groove is a cavity filter is formed to a minimum diameter that the ground ground terminal is retracted by the elasticity is inserted into the annular groove, the separation can be prevented.
The method according to claim 8,

The ground ground terminal,

A fixed ring part seated and fixed to the installation surface of the annular groove; And

A plurality of elastic ground parts formed in the circumferential direction at the inner circumferential end of the fixing ring part and extending toward the center, and inclined toward the PCB board; Including, the cavity filter.
The method according to claim 2,

The terminal insertion hole may include a first insertion hole having an inner diameter relatively wider than that of the PCB board, a second insertion hole having a smaller inner diameter than the first insertion hole, and a smaller inner diameter than the third insertion hole. A third insertion opening,

And a dielectric bush inserted into the second insertion hole and the third insertion hole in the form of a two-stage cylinder.
The method according to claim 10,

The terminal portion,

A pin member disposed inside the terminal insertion hole, one end of which is connected to the resonating element and the other end of which is connected to the PCB board side; More,

The pin member,

A pin part positioned over the second insertion hole and the third insertion hole so as to be connected to the resonance element as the one end;

A terminal body part which is formed in the form of a two-stage cylinder integral with the pin part, and has a socket part having a cone-shaped opening therein and positioned over the first insertion hole; And

An elastic connector inserted into and fixed to the socket part and connected to the PCB board as the other end; Including, the cavity filter.
The method according to claim 11,

The elastic connector has a cylindrical structure inserted into the socket portion, a truncated conical pin socket contact portion inserted corresponding to the cone-shaped opening portion and an impedance matching portion extending from the pin socket contact portion, the cavity comprising: filter.
The method according to claim 12,

The elastic connector is inserted into the socket portion, provided in contact with the PCB board side, and formed on a circumference of the circular spring portion and the circular spring portion is formed to have a vertical vertical section of a certain width portion except for both ends 2. A cavity filter comprising two plate-shaped protrusions formed to protrude perpendicularly to a circumference from two adjacent points.