A laminated chip ceramic RF filter

Abstract

The utility model discloses a laminated sheet type ceramic radio frequency filter, concretely relates to radio frequency filter technical field, including ceramic containing shell and laminated filter, the both sides of the top of ceramic containing shell all are provided with apron, and the top center of ceramic containing shell is located laminated filter, and the top of laminated filter is installed with shield plate, and the both ends of the top of ceramic containing shell near shield plate all are provided with connecting cable, the center of ceramic containing shell is provided with containing groove, and the inside sliding connection of containing groove has extrusion strip, and the both ends of containing groove all are installed with the screw rod that penetrates, the bottom center of containing groove is provided with the metal contact that is connected with laminated filter correspondingly, and the both sides of laminated filter all are provided with radio frequency connection mouth, the both sides of shield plate are bent to the bottom end, and the both sides of shield plate all are provided with extrusion plate. The utility model has the advantages of convenient adjustment installation different size filter, convenient fixed and avoids the advantage that separates.

Description

Technical Field

[0001] This utility model relates to the field of radio frequency filter technology, specifically to a stacked chip ceramic radio frequency filter. Background Technology

[0002] A filter is a two-port network that is selective for frequency and has always played a very important role in the communications industry. The multilayer chip RF low-pass filter is a new type of filter. With the development of communication technology, its operating frequency range is getting wider and wider, and the frequency of use is getting higher and higher. The trend of miniaturization and high frequency development is very obvious. The multilayer chip ceramic RF filter is a high-frequency filter made by multiple processes such as electronic ceramic material casting molding process, high-precision printing multilayer technology and low temperature sintering technology.

[0003] An embedded PCBA module with publication number CN223142219U includes a ceramic substrate microwave filter and a multilayer microwave printed circuit board. The multilayer microwave printed circuit board has blind slots and board-end RF transmission lines. The blind slots are identical in shape and size to the ceramic substrate microwave filter, and a grounded copper layer is located at the bottom of the blind slots. The board-end RF transmission lines are printed on the board surfaces on both sides of the blind slots. The ceramic substrate microwave filter is embedded in the blind slots and flush with the upper surface of the multilayer microwave printed circuit board. The ground layer on the bottom surface of the ceramic substrate microwave filter is in contact with the ground plane of the multilayer microwave printed circuit board. The ceramic substrate microwave filter has a first RF transmission port and a second RF transmission port extending to the edge of the filter. The first and second RF transmission ports are connected to adjacent board-end RF transmission lines via signal connectors. Various measures are taken to reduce the generation of parasitic parameters to ensure the normal operation of the product.

[0004] The aforementioned existing technology has some defects in use. The connection structure between the ceramic substrate microwave filter and the multilayer microwave printed circuit board is unclear, and it is unclear how the shielding cover is installed and fixed, which can easily lead to loosening and detachment. At the same time, the size of its groove is fixed and cannot be adjusted, nor can it be installed and fixed for ceramic substrate microwave filters of different sizes, resulting in poor applicability. Utility Model Content

[0005] The purpose of this invention is to provide a multilayer ceramic radio frequency filter that solves the problems of inconvenient installation and adjustment, poor applicability, unstable fixation, and easy loosening and detachment of existing radio frequency filters.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stacked ceramic radio frequency filter, comprising a ceramic housing and a stacked filter, wherein a cover plate is provided on both sides of the top of the ceramic housing, the stacked filter is located at the top center of the ceramic housing, a shielding plate is installed on the top of the stacked filter, and connecting cables are provided at both ends of the top of the ceramic housing near the shielding plate. The ceramic housing has a receiving groove at its center, and an extrusion strip is slidably connected inside the receiving groove. Both ends of the receiving groove are connected by lead screws. The bottom center of the receiving slot is provided with a metal contact corresponding to the stacked filter, and radio frequency connection ports are provided on both sides of the stacked filter. The shielding plate is bent towards the bottom on both sides, and extrusion plates are provided on both side walls of the shielding plate. One side of the extrusion strip is attached to the side wall of the shielding plate.

[0007] Preferably, the lead screw is provided with a circumferential thread near the inside of the receiving groove, and the circumferential threads on the outer walls at both ends of the lead screw are reversed.

[0008] Preferably, a groove is provided at the center of the cover plate, and the size of the groove is smaller than the size of the receiving groove. Fixing bolts are connected through both ends of the two cover plates on the side away from each other. Mounting holes are provided at the top of the ceramic receiving shell at the positions corresponding to the fixing bolts.

[0009] Preferably, the extrusion plate is fitted to the bottom of the receiving groove, the extrusion plate is located at the bottom of the extrusion strip, and the inner wall of the shielding plate is fitted to the top outer wall of the stacked filter.

[0010] Preferably, the end of the connecting cable near the RF connector is provided with an RF connector head, and the connecting cable is connected and fixed to the inside of the RF connector head. Both sides of the outer wall of the connecting cable are pressed against the cover plate.

[0011] Preferably, both ends of the lead screw are fitted with knobs that penetrate the interior of the ceramic housing, and the interior of the ceramic housing has through holes corresponding to the lead screw.

[0012] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. Simultaneously rotating the two lead screws causes the two extrusion strips to move closer together, thus extruding the shielding plate. This allows the shielding plate to be tightly pressed against the side walls of the multilayer filter, achieving compression and fixation. Furthermore, due to the large size of the receiving groove and the easy adjustment of the extrusion strips, multilayer filters of different sizes can be easily installed according to usage requirements, making it highly adaptable.

[0013] 2. The rotation of the lead screw drives the two extrusion strips to move closer to each other, thereby extruding the shielding plate and moving the extrusion strips to the top position of the extrusion plate, thus blocking the extrusion plate and effectively preventing it from moving in the opposite direction. This prevents the shielding plate from moving and detaching. Furthermore, since the two lead screws need to rotate independently, it is possible to effectively prevent the lead screws from rotating accidentally and causing the extrusion strips to move, thus preventing the shielding plate from detaching and keeping the multilayer filter firmly fixed. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a top view of the present invention.

[0017] Figure 3 This is a schematic diagram of the connection structure between the ceramic receiving shell and the cover plate of this utility model.

[0018] Figure 4 This is a schematic diagram of the internal structure of the ceramic housing shell of this utility model.

[0019] Figure 5 This is a schematic diagram of the external connection structure of the shielding plate of this utility model.

[0020] Explanation of reference numerals in the attached figures: 1. Ceramic housing; 101. Receiving groove; 102. Extrusion strip; 103. Lead screw; 2. Cover plate; 201. Fixing bolt; 202. Mounting hole; 3. Shielding plate; 301. Extrusion plate; 4. Multilayer filter; 401. RF connector; 5. Connecting cable; 501. RF connector. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] This utility model provides, for example Figure 1-5The illustrated multilayer ceramic radio frequency filter includes a ceramic housing 1 and a multilayer filter 4. Cover plates 2 are provided on both sides of the top of the ceramic housing 1. The multilayer filter 4 is located at the center of the top of the ceramic housing 1. A shielding plate 3 is installed on the top of the multilayer filter 4. Connecting cables 5 are provided at both ends of the top of the ceramic housing 1 near the shielding plate 3. A receiving groove 101 is formed at the center of the ceramic housing 1. An extrusion strip 102 is slidably connected inside the receiving groove 101. Lead screws 103 are installed through both ends of the receiving groove 101. A metal contact corresponding to the multilayer filter 4 is provided at the center of the bottom of the receiving groove 101. Radio frequency connection ports 401 are provided on both sides of the multilayer filter 4. The shielding plate 3 is bent towards the bottom on both sides. An extrusion plate 301 is provided on both side walls of the shielding plate 3. One side of the extrusion strip 102 is attached to the side wall of the shielding plate 3.

[0023] Rotating the two lead screws 103 causes them to rotate, bringing the two extrusion strips 102 closer together. This allows the extrusion strips 102 to compress the shielding plate 3, ensuring that both sides of the shielding plate 3 are tightly pressed against the sidewalls of the multilayer filter 4, thus achieving compression fixation. Simultaneously, due to the large size of the receiving groove 101 and the easy adjustment of the extrusion strips 102, multilayer filters 4 of different sizes can be easily installed according to usage requirements. The extrusion strips 102 compress the shielding plate 3 and move to the top position of the extrusion plate 301, effectively preventing it from moving in the opposite direction and thus avoiding the shielding plate 3 from detaching. Furthermore, since the two lead screws 103 need to rotate synchronously to move the extrusion strips 102, accidental rotation of the lead screws 103 can be prevented from causing the extrusion strips 102 to move, preventing the shielding plate 3 from detaching and maintaining a tight fixation of the multilayer filter 4.

[0024] like Figure 1 , Figure 3 As shown, a groove is provided in the center of the cover plate 2, and the size of the groove is smaller than the size of the receiving groove 101. Fixing bolts 201 are connected through both ends of the two cover plates 2 on the side that are far apart from each other. The top of the ceramic receiving shell 1 is provided with mounting holes 202 corresponding to the fixing bolts 201, so that the two cover plates 2 on the side that are close to each other can squeeze and clamp the connecting cable 5. Then, the fixing bolts 201 at both ends of the cover plate 2 are rotated to fix the cover plate 2, thereby preventing the connecting cable 5 from falling off.

[0025] like Figure 3 , Figure 5As shown, the lead screw 103 is provided with a spiral thread near the inside of the receiving groove 101, and the spiral threads on the outer walls of both ends of the lead screw 103 are reversed. Both ends of the lead screw 103 are fitted with knobs through the inside of the ceramic receiving shell 1. The inside of the ceramic receiving shell 1 has through holes corresponding to the lead screw 103. The extrusion plate 301 is attached to the bottom of the inside of the receiving groove 101. The extrusion plate 301 is located at the bottom of the extrusion strip 102. The inner wall of the shielding plate 3 is attached to the top outer wall of the multilayer filter 4. The extrusion strip 102 can extrude the shielding plate 3 and move the extrusion strip 102 to the top position of the extrusion plate 301, thereby blocking the extrusion plate 301. This effectively prevents the extrusion plate 301 from moving in the opposite direction, thus preventing the shielding plate 3 from moving and detaching. Furthermore, since the two lead screws 103 need to rotate synchronously to drive the extrusion strip 102 to move, it can effectively prevent the lead screw 103 from rotating accidentally and causing the extrusion strip 102 to move, thus preventing the shielding plate 3 from detaching and maintaining a tight fixation of the multilayer filter 4.

[0026] like Figure 1 , Figure 4 As shown, an RF connector 501 is provided at one end of the connecting cable 5 near the RF connector 401. The connecting cable 5 is connected and fixed to the inside of the RF connector 401 through the RF connector 501. Both sides of the outer wall of the connecting cable 5 are pressed against the cover plate 2, so that the two cover plates 2 are pressed and clamped on the side that is close to each other. Then, the fixing bolts 201 at both ends of the cover plate 2 are rotated to fix the cover plate 2, thereby preventing the connecting cable 5 from falling off. This achieves a fixed connection between the RF connector 501 and the RF connector 401, effectively fixing the entire device.

[0027] In use, the corresponding multilayer filter 4 can be easily placed in the center of the receiving groove 101 of the ceramic receiving shell 1, and then the corresponding shielding plate 3 can be placed on the surface of the multilayer filter 4. Then, the RF connector 501 at one end of the connecting cable 5 can be inserted into the RF connector 401 to complete the assembly. Then, the two lead screws 103 can be rotated, so that the lead screws 103 rotate and drive the two extrusion strips 102 to move closer to each other, so that the extrusion strips 102 can extrude the shielding plate 3, so that the two sides of the shielding plate 3 can be tightly pressed and adhered to the side wall of the multilayer filter 4. This achieves compression and fixation. Furthermore, due to the large size of the receiving groove 101 and the easy adjustment of the extrusion strip 102, it is possible to conveniently install stacked filters 4 of different sizes according to usage requirements, resulting in high applicability. During operation, the corresponding ceramic receiving shell 1 can be easily installed on the corresponding circuit board surface, and the connecting cable 5 can be electrically connected to the corresponding device input / output terminal. This allows the corresponding radio frequency signal to be effectively input into the stacked filter 4 via the connecting cable 5, thereby activating the stacked filter 4 to operate and transmitting the required radio frequency band to the device.

[0028] During use, rotating the two lead screws 103 causes the two extrusion strips 102 to move closer together, thus extruding the shielding plate 3 and moving them to the top of the extrusion plate 301. This effectively prevents the extrusion plate 301 from moving in the opposite direction, thus preventing the shielding plate 3 from moving away. Since the two lead screws 103 need to rotate synchronously to move the extrusion strips 102, accidental rotation of the lead screws 103 can prevent the extrusion strips 102 from moving, thus preventing the shielding plate 3 from detaching and maintaining a tight fixation on the multilayer filter 4. Additionally, during use, the two cover plates 2 can be pressed and clamped onto the connecting cable 5 on their side where they are close together. Rotating the fixing bolts 201 at both ends of the cover plate 2 further secures the cover plate 2, preventing the connecting cable 5 from falling off. This achieves a fixed connection between the RF connector 501 and the RF connector port 401, effectively fixing the entire device.

[0029] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multilayer ceramic radio frequency filter, comprising a ceramic housing (1) and a multilayer filter (4), characterized in that: The ceramic housing (1) is provided with cover plates (2) on both sides of the top. The stacked filter (4) is located at the top center of the ceramic housing (1). The top of the stacked filter (4) is equipped with a shielding plate (3). The top of the ceramic housing (1) is provided with connecting cables (5) at both ends of the top of the ceramic housing (1) near the shielding plate (3). The ceramic housing (1) has a receiving groove (101) at its center. An extrusion strip (102) is slidably connected inside the receiving groove (101). A lead screw (103) is installed through both ends of the receiving groove (101). The bottom center of the receiving groove (101) is provided with a metal contact corresponding to the stacked filter (4), and radio frequency connection ports (401) are provided on both sides of the stacked filter (4). The shielding plate (3) is bent towards the bottom on both sides, and extrusion plates (301) are provided on both sides of the shielding plate (3). One side of the extrusion strip (102) is attached to the side wall of the shielding plate (3).

2. The multilayer ceramic radio frequency filter according to claim 1, characterized in that: The lead screw (103) is provided with a circumferential thread near the inside of the receiving groove (101), and the circumferential threads on the outer walls at both ends of the lead screw (103) are reversed.

3. The multilayer ceramic radio frequency filter according to claim 1, characterized in that: The center of the cover plate (2) is provided with a groove, and the size of the groove is smaller than the size of the receiving groove (101). The two ends of the two cover plates (2) on the side away from each other are connected by fixing bolts (201). The top of the ceramic receiving shell (1) is provided with mounting holes (202) corresponding to the fixing bolts (201).

4. The multilayer ceramic radio frequency filter according to claim 1, characterized in that: The extrusion plate (301) is attached to the bottom of the inner end of the receiving groove (101), the extrusion plate (301) is located at the bottom of the extrusion strip (102), and the inner wall of the shielding plate (3) is attached to the top outer wall of the stacked filter (4).

5. The multilayer ceramic radio frequency filter according to claim 1, characterized in that: The connecting cable (5) is provided with an RF connector (501) at one end near the RF connector (401). The connecting cable (5) is connected and fixed to the inside of the RF connector (401) through the RF connector (501). Both sides of the outer wall of the connecting cable (5) are pressed against the cover plate (2).

6. The multilayer ceramic radio frequency filter according to claim 1, characterized in that: Both ends of the lead screw (103) are fitted with knobs that penetrate the interior of the ceramic housing (1). The interior of the ceramic housing (1) has through holes corresponding to the lead screw (103).

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