CN108832235A - Surface mount dielectric waveguide filter, filter mount and circuit board - Google Patents

Abstract

The invention relates to a surface-mounted dielectric waveguide filter, which includes a filter body, a surface metallization layer is arranged on the outer surface of the filter body, two slits are opened on the surface metallization layer, and the filter The device body is in an exposed state at the gap. The excitation structure of the present invention adopts a coplanar slit structure, so that the excitation is applied to the ground, which is completely different from the existing ground ring magnetic field excitation or probe electric field excitation, so that in the microwave and millimeter wave bands of radar and 5G, A true surface mount dielectric waveguide filter is realized. The connection between the filter and the circuit board of the invention is convenient and the manufacturing process is simple. The invention also relates to a filter installation socket to solve the technical problem of inconvenient connection between the filter and the circuit board in the prior art. The invention also relates to a circuit board to solve the technical problem of inconvenient connection between the filter and the circuit board in the prior art.

Description

Surface mount dielectric waveguide filter, filter mount and circuit board

technical field

The invention relates to the technical field of microwave and millimeter wave circuits, in particular to a surface-mounted dielectric waveguide filter, a filter mount and a circuit board.

Background technique

The filter is a device for filtering waves, which can effectively filter out the frequency point of a specific frequency in the power line or frequencies other than the frequency point, obtain a power signal of a specific frequency, or eliminate a power signal of a specific frequency . The filter is connected to the circuit board. The circuit board is the PCB board, also known as the printed circuit board, which is the provider of the electrical connection of the electronic components.

In the input and output excitation structure of the existing filter, a TEM wave type excitation with a coaxial structure is often used, that is, the inner conductor and the ground must be separated. On the excitation surface, the inner conductor is an isolated surface, and the inner conductor must be isolated from the ground. . The input and output of the filter are often connected to the user's product using SMA or N-type connectors. The connection between the filter and the circuit board is inconvenient. After the SMA connector is removed from the existing filter input and output excitation structure, it is often only through The root needle is connected with the user's microstrip line, and when the needle penetrates deep into the dielectric body, it can realize the magnetic field excitation of the ground ring or the electric field excitation of the probe. The filter manufacturing process is difficult and difficult to manufacture, resulting in a decline in the product qualification rate.

Contents of the invention

The object of the present invention is to provide a surface-mount dielectric waveguide filter to solve the technical problems in the prior art that the connection between the filter and the circuit board is inconvenient and the manufacturing process of the filter is difficult.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: a surface-mounted dielectric waveguide filter, comprising a filter body, the outer surface of the filter body is provided with a surface metallization layer, and the surface Two slits are opened on the metallization layer, and the filter body is exposed at the slits.

It should be pointed out that the surface covered by the surface metallization layer does not include the inner surface of the slot. The shape of the filter body is also indeterminate in the shape of the gap or the shape of the boundary line, which can be regular or irregular. The size of the gap is related to the user's index requirements, material characteristics, and filter body structure. Preferably, the filter body is a cuboid, and the cross-section of the slot is an inverted "匚" shape.

It should be noted that the thickness of the surface metallization layer is 0.1-3 μm, that is, the thickness of the gap is also 0.1-3 μm. Preferably, the thickness of the surface metallization layer is 2 μm, and the thickness of the gap is also 2 μm.

The excitation structure of the present invention adopts a coplanar slit structure, so that the excitation is applied to the ground, which is completely different from the existing ground ring magnetic field excitation or probe electric field excitation, so that in the microwave and millimeter wave bands of radar and 5G, A real surface-mounted dielectric waveguide filter is realized, the connection between the filter and the circuit board is convenient, and the filter manufacturing process is simple.

It should be noted that the filter has an input port and must have an output port, so it must be, and there are only two ports, that is, two gaps.

Preferably, a connecting piece electrically connected to the surface metallization layer is provided in the gap, and the connecting piece is used to electrically connect to the input/output microstrip line.

It should be pointed out that the connecting parts include metal strips, welding rods, etc., that is, objects that can be electrically connected to the surface metallization layer or to the input/output microstrip line. Therefore, the connector can be either an object with a metallized layer on the surface, or a metal strip as a whole. Moreover, the connector is electrically connected to the metallized ground of the filter, and the connector is electrically connected to the input/output microstrip line, that is, the input/output microstrip line of the circuit board is also electrically connected to the ground of the filter.

It should be noted that the starting edge of the slit is located on the line where the bottom surface of the filter body and the side of the filter body intersect, and the connecting piece is arranged on the starting edge and penetrates into the slit, which is convenient for the surface of the filter and the circuit board. Paste installation.

Among them, the connecting piece can be set as a welding rod, which is convenient for the user to weld the filter on the circuit board, the connection is reliable, and it is convenient for surface mount installation. The connectors may also be part of the surface metallization layer and be electrically connected to other surface metallization layers. That is, the connector can be integrally formed with the surface metallization layer or can be manufactured separately.

Preferably, the filter body is provided with two or more through holes on the same straight line, and the surface covered by the surface metallization layer includes the inner surface of the through hole, the filter body It includes a dielectric resonator and an input/output resonator, the dielectric resonator is arranged between adjacent through holes, and the input/output resonator is arranged on one side of the filter body and connected to the filter body between adjacent through-holes.

Among them, the wave mode of the resonator is TE01 wave mode. The through hole is a hole that runs through the entire filter body, and the number of through holes is the same as that of the present invention. For an N-cavity dielectric waveguide filter, there are N-1 through holes. With different via diameters, the amount of coupling between adjacent resonators is different. The through hole can be empty or solid, and the shape can be polygonal columnar or cylindrical. Therefore, the coupling structure of the present invention realizes the coupling between the resonators by providing a through hole and a surface metallization layer connected to the filter body on the inner surface of the through hole, so that the size of the present invention is smaller and the structural strength is higher. .

It should be pointed out that the straight line where the through holes are located, that is, the arrangement direction of the through holes, refers to the line connecting the center of the top surface of the through hole, wherein a certain error is allowed, that is, a slight deviation between the center of the circle on the top surface of the through hole and the straight line is allowed.

Preferably, blind holes are formed on the top surfaces of the dielectric resonator and the input/output resonator, and the blind holes and the slots are respectively arranged on the intersecting or opposite surfaces of the filter body.

The blind hole, that is, the via hole that does not penetrate the entire filter body, has a certain depth. The blind hole is arranged on the top surface of the dielectric resonator and the input/output resonator, that is, the blind hole is arranged between adjacent through holes, or between a side of the filter body and a through hole adjacent to the side of the filter body In the area between to achieve good echo performance of the filter, it helps to make the size of the filter smaller and more compact. The setting of blind holes can be better applied to occasions that require higher miniaturization or require fine-tuning of the electrical performance of the filter.

The invention can realize the design and production of high-performance micro-sized filters in the range of 6-52.6 GHz, and the size of the 4-cavity filter can be smaller than 6×2.5×1.0 mm in the millimeter wave frequency band.

Preferably, the slits are respectively provided on opposite sides of the filter body, and the slits are respectively provided on opposite sides of the filter body, wherein the connecting line between the two slits It is arranged in parallel with the straight line where the through hole is located.

Wherein, there are two slits, which are respectively arranged on opposite sides of the filter body, so that the relative bandwidth of the filter is less than 2%. And the gap is open; the electric field on the gap surface is perpendicular to the bottom surface and the top surface of the filter, the electric field is concentrated in the dielectric body, and the electric field in the air is close to zero. Therefore, the gap does not need to be shielded, nor does it affect the electrical performance of the filter, nor does it affect other components and circuit performance on the user's circuit. Therefore, the user of the filter with this structure can directly paste it on the existing circuit board without doing it. The rest of the matching does not require any auxiliary measures, which makes the connection between the filter and the circuit board convenient, and also reduces the cost of the connector. The connecting line between the two slits is set parallel to the straight line where the through hole is located, that is, the slit is only set on the two sides of the filter intersecting the straight line where the through hole is located.

Preferably, the slit is provided on the bottom surface of the filter body, wherein a line connecting the two slits is arranged parallel to a straight line where the through hole is located.

Wherein, there are two slots, which are arranged on the bottom surface of the filter body, so that the filter has a relative bandwidth of about 2-15%. For filters with this structure, since the electric field in the medium will radiate into the air when the gap is located on the bottom surface, a device for shielding the electric field is required. Therefore, the filter with this structure needs to shield the gap when it is connected to the circuit board, but There is also no need for SMA or N-type connectors, making the filter and board connections easy.

It should be pointed out that when the filter body is a cuboid, the two sides connected by the through hole are called the upper and lower sides, the two sides intersected by the straight line where the through hole is located are the left and right sides, and the remaining two sides are the front and rear sides, and the gap cannot be placed in the front and back. side and top.

It should be noted that the blind hole is only set on the top surface, so when the slit is set on the left and right sides, the blind hole setting and the slit are respectively set on the surface where the filter body intersects; when the slit is set on the bottom surface, the blind hole setting and the The slots are respectively arranged on two opposite surfaces of the filter body.

The purpose of the present invention is to provide a filter mounting socket to solve the technical problem of inconvenient connection between the filter and the circuit board in the prior art.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: a filter mounting bracket for installing the above-mentioned surface mount dielectric waveguide filter, including the mounting bracket, the top surface of the mounting bracket An installation slot matching the filter body is provided, and the opening of the gap faces the installation socket, and the installation socket is provided with a through hole corresponding to the gap.

Wherein, the installation card seat can be made of silver-plated aluminum plate. In actual use, insert the filter into the installation card slot of the installation card holder, and the installation card holder is embedded in the user's circuit board or the user's metal ground. The setting of the installation card seat can not only protect the filter to a certain extent, but also facilitate the user to install the filter on the circuit board, making the connection between the filter and the circuit board convenient. The setting of the through hole is reserved to avoid covering the gap and affecting the installation of the filter on the circuit board.

Preferably, a bottom plate is further provided on the bottom surface of the mounting bracket.

Wherein, the bottom plate can also be made of silver-plated aluminum plate. The setting of the bottom plate increases the structural rigidity of the mounting bracket and increases its service life.

The purpose of the present invention is also to provide a circuit board to solve the technical problem of inconvenient connection between the filter and the circuit board in the prior art.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: a circuit board for installation and use of the above-mentioned surface mount dielectric waveguide filter or the above-mentioned filter mounting socket, including a circuit board body and a The input/output microstrip line on the circuit board body, the circuit board body includes a copper foil layer, a dielectric layer and an aluminum plate ground layer connected in sequence from top to bottom, and the copper foil layer and the dielectric layer are provided with installation holes , the large ground layer of the aluminum plate is provided with a boss, the boss is arranged in the installation hole and the top surface of the boss is set at the same height as the top surface of the copper foil layer, and the circuit board body Connecting holes corresponding to the slits are opened on and on both sides of the boss.

By setting the boss on the large ground layer of the aluminum plate of the circuit board, using the boss to cooperate with the gap, the electric field radiation of the gap is shielded, and finally the input/output microstrip line and the connector are welded together to realize the surface mount installation of the filter. Simple, easy filter and board connection, and easy to implement. The connection holes are recessed holes that give way to filter slots, and their inner surfaces are metallized.

A circuit board, which can be used for the above-mentioned surface-mount dielectric waveguide filter or the above-mentioned filter installation card holder, includes a circuit board body and an input/output microstrip line arranged on the circuit board body, and the circuit board The body includes a copper foil layer, a dielectric layer, and an aluminum plate ground layer that are sequentially connected from top to bottom. The circuit board body is provided with connection holes corresponding to the gaps, and a hole is opened on the top surface of the circuit board body. There is a ground hole, and the copper foil layer, the dielectric layer and the aluminum plate ground layer are electrically connected together through the connection hole and the ground hole.

Wherein, both the connecting hole and the grounding hole are through holes metallized on the inner surface. By opening a connection hole through the circuit board body on the circuit board, the shape of the connection hole is the same as the gap, and using the circuit board sinking copper process at a specific position to completely electrically connect the upper and lower copper foil layers, the dielectric layer and the large ground layer of the aluminum board on the PCB. Connect them together, and finally weld the input/output microstrip line and the connector together to realize the surface mount installation of the surface mount dielectric waveguide filter, which has a simple structure and is easy to implement.

Based on this, compared with the prior art, the present invention has the advantages of small size, convenient connection between the filter and the circuit board, and simple processing technology of the filter.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Accompanying drawing 1 is the plan view of embodiment 1 of surface mount dielectric waveguide filter of the present invention;

Accompanying drawing 2 is the left side view of Embodiment 1 of the surface mount dielectric waveguide filter of the present invention;

Accompanying drawing 3 is the bottom view of Embodiment 2 of the surface-mounted dielectric waveguide filter of the present invention;

Accompanying drawing 4 is the top view of Embodiment 1 of the filter installation holder of the present invention;

Accompanying drawing 5 is the explosion diagram of the installation structure of the third embodiment of the surface-mounted dielectric waveguide filter of the present invention;

Accompanying drawing 6 is the top view of Embodiment 2 of the filter installation holder of the present invention;

Accompanying drawing 7 is the explosion diagram of the installation structure of Embodiment 4 of the surface-mounted dielectric waveguide filter of the present invention;

Accompanying drawing 8 is the top view of Embodiment 1 of the circuit board of the present invention;

Accompanying drawing 9 is the top view of embodiment 2 of the circuit board of the present invention;

Accompanying drawing 10 is the sectional view of the installation structure of the second embodiment of the circuit board and the surface mount dielectric waveguide filter of the present invention;

Accompanying drawing 11 is the cross-sectional view of the installation structure of the third embodiment of the circuit board and the surface-mounted dielectric waveguide filter of the present invention;

Accompanying drawing 12 is the cross-sectional view of the installation structure of the fourth embodiment of the circuit board and the surface-mounted dielectric waveguide filter of the present invention;

Accompanying drawing 13 is the schematic diagram of the installation structure of the first embodiment of the surface mount dielectric waveguide filter and the circuit board of the present invention;

Accompanying drawing 14 is the left side view of embodiment 1 of the circuit board of the present invention.

Wherein, oblique lines in accompanying drawings 1 to 10 and accompanying drawings 13 and 14 represent surface metallization layers or copper foil layers.

Reference signs:

1-filter body; 2-surface metallization layer; 11-slit;

12-connector; 13-through hole; 14-blind hole;

3-Installation card holder; 31-Installation card slot; 32-Reserved through hole;

33-bottom plate; 4-circuit board body; 41-copper foil layer;

42-medium layer; 43-aluminum plate large formation; 44-boss;

45-connection hole; 46-ground hole; 5-input/output microstrip line.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "front", "rear", "vertical", "level", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific Azimuth configuration and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Embodiment 1 of surface mount dielectric waveguide filter:

See Figure 1 and Figure 2, a surface-mount dielectric waveguide filter, including a filter body 1, a surface metallization layer 2 is provided on the outer surface of the filter body 1, and two slits 11 are opened on the surface metallization layer 2 , the filter body 1 is in an exposed state at the slit 11 .

The excitation structure of the present invention adopts a coplanar slit structure, so that the excitation is applied to the ground, which is completely different from the existing ground ring magnetic field excitation or probe electric field excitation, so that in the microwave and millimeter wave bands of radar and 5G, A real surface-mounted dielectric waveguide filter is realized, the connection between the filter and the circuit board is convenient, and the filter manufacturing process is simple. It should be noted that the filter has an input port and must have an output port, so it must be, and there are only two ports, that is, two gaps.

It should be pointed out that the surface covered by the surface metallization layer does not include the inner surface of the slot. The shape of the filter body is also indeterminate in the shape of the gap or the shape of the boundary line, which can be regular or irregular. The size of the gap is related to the user's index requirements, material characteristics, and filter body structure. In this embodiment, the filter body is a cuboid, and the cross-section of the gap is in the shape of an inverted "匚".

It should be noted that the thickness of the surface metallization layer is 0.1-3 μm, that is, the thickness of the gap is also 0.1-3 μm. Preferably, the thickness of the surface metallization layer is 2 μm, and the thickness of the gap is also 2 μm.

Referring to FIG. 2 , there is a connecting piece electrically connected to the surface metallization layer 2 inside the connecting piece 12 , and the connecting piece is used to electrically connect to the input/output microstrip line 5 .

It should be pointed out that the connecting parts include metal strips, welding rods, etc., that is, objects that can be electrically connected to the surface metallization layer or to the input/output microstrip line. Therefore, the connector can be either an object with a metallized layer on the surface, or a metal strip as a whole. Moreover, the connector is electrically connected to the metallized ground of the filter, and the connector is electrically connected to the input/output microstrip line, that is, the input/output microstrip line of the circuit board is also electrically connected to the ground of the filter.

It should be noted that the starting edge of the slit is located on the line where the bottom surface of the filter body and the side of the filter body intersect, and the connecting piece is arranged on the starting edge and penetrates into the slit, which is convenient for the surface of the filter and the circuit board. Paste installation.

Among them, the connecting piece can be set as a welding rod, which is convenient for the user to weld the filter on the circuit board, the connection is reliable, and it is convenient for surface mount installation. The connectors may also be part of the surface metallization layer and be electrically connected to other surface metallization layers. That is, the connector can be integrally formed with the surface metallization layer or can be manufactured separately.

As shown in Fig. 1, the filter body 1 is provided with two or more through holes 13 on the same straight line, and the surface covered by the surface metallization layer 2 includes the inner surface of the through holes 13, and the filter body 1 includes a dielectric The resonator and the input/output resonator, the dielectric resonator is arranged between adjacent through holes 13, the input/output resonator is arranged between one side of the filter body 1 and the through hole 13 adjacent to the side of the filter body 1 between.

Among them, the wave mode of the resonator is TE01 wave mode. The through hole is a hole that runs through the entire filter body, and the number of through holes is the same as that of the present invention. For an N-cavity dielectric waveguide filter, there are N-1 through holes. With different via diameters, the amount of coupling between adjacent resonators is different. The through hole can be empty or solid, and the shape can be polygonal columnar or cylindrical. Therefore, the coupling structure of the present invention realizes electrical connection by setting a through hole and a surface metallization layer connected to the filter body on the inner surface of the through hole, so that the size of the present invention is smaller, the structural strength is higher, and it is compatible with the pin The coupling method is more efficient than debugging.

Referring to FIG. 1 , a blind hole 14 is opened on the top surface of the dielectric resonator and the input/output resonator, and the blind hole 14 and the slot 11 are respectively arranged on the opposite or intersecting surfaces of the filter body 1 .

The blind hole, that is, the via hole that does not penetrate the entire filter body, has a certain depth. The blind hole is arranged on the top surface of the dielectric resonator and the input/output resonator, that is, the blind hole is arranged between adjacent through holes or between a side of the filter body and a through hole adjacent to the side of the filter body In order to achieve good echo performance of the filter, it helps to make the size of the filter smaller and more compact.

Wherein, the blind holes are arranged at the center positions of the top surfaces of the dielectric resonator and the input/output resonator, and each blind hole and each through hole are located on the same straight line.

See Fig. 2 and Fig. 13, the slits 11 are respectively arranged on the opposite sides of the filter body 1, and the slits are respectively arranged on the opposite sides of the filter body, wherein, the connecting line between the two slits and the through hole are located Straight lines are arranged in parallel.

Wherein, there are two slits, which are respectively arranged on opposite sides of the filter body, so that the relative bandwidth of the filter is less than 2%. And the gap is open; the electric field on the gap surface is perpendicular to the bottom surface and the top surface of the filter, the electric field is concentrated in the dielectric body, and the electric field in the air is close to zero. Therefore, the gap does not need to be shielded, nor does it affect the electrical performance of the filter, nor does it affect other components and circuit performance on the user's circuit. Therefore, the user of the filter with this structure can directly paste it on the existing circuit board without doing it. The rest of the matching does not require any auxiliary measures, which makes the connection between the filter and the circuit board convenient, and also reduces the cost of the connector.

The connecting line between the two slits is set parallel to the straight line where the through hole is located, that is, the slit is only set on the two sides of the filter intersecting the straight line where the through hole is located.

It should be noted that when the filter body is a cuboid, the two sides connected by the through hole are called the upper and lower sides, the two sides intersected by the straight line where the through hole is located are the left and right sides, and the remaining two sides are the front and rear sides, and the gap cannot be placed in the front and back. side and top.

Among them, the straight line where the through hole is located is the arrangement direction of the through hole, the axis of the through hole is the opening direction of the through hole, the normal line of the gap surface is the normal line perpendicular to the gap surface, and the connection line between the two gaps is the two gaps. The connecting line between the center points of . The axes of the through holes are arranged perpendicularly to the normals of the slit surfaces, that is, the normals of the two slit surfaces are arranged parallel to the arrangement direction of the through holes.

It should be noted that the blind holes are only arranged on the top surface, so when the slits are arranged on the left and right sides, the blind holes and the slits are respectively arranged on the intersecting surfaces of the filter body.

It should be pointed out that the two slits are arranged symmetrically and are respectively located on opposite sides of the filter body, so the left view and right view of Embodiment 1 of the surface-mount dielectric waveguide filter of the present invention are symmetrical. The slot can be partly or completely lateral, in which case the slot can be completely lateral, ie no surface metallization is provided on this side.

Embodiment 2 of surface mount dielectric waveguide filter:

As shown in FIG. 3 , the slit 11 is provided on the bottom surface of the filter body 1 , wherein the connecting line between the two slits is set parallel to the straight line where the through hole is located. Other parts are the same as the first embodiment of the surface mount dielectric waveguide filter.

Wherein, there are two slots, which are arranged on the bottom surface of the filter body, so that the filter has a relative bandwidth of about 2-15%. For filters with this structure, since the electric field in the medium will radiate into the air when the gap is located on the bottom surface, a device for shielding the electric field is required. Therefore, the filter with this structure needs to shield the gap when it is connected to the circuit board, but There is also no need for SMA or N-type connectors, making the filter and board connections easy.

Among them, the straight line where the through hole is located is the arrangement direction of the through hole, the axis of the through hole is the opening direction of the through hole, the normal line of the gap surface is the normal line perpendicular to the gap surface, and the connection line between the two gaps is the two gaps. The connecting line between the center points of . The axis of the through hole is set parallel to the normal line of the slit surface, that is, the normal line of the two slit surfaces is set orthogonally to the arrangement direction of the through hole.

It should be noted that the blind hole is only arranged on the top surface, so when the slit is arranged on the bottom surface, the blind hole and the slit are respectively arranged on two surfaces opposite to the filter body.

In addition, the maximum size of the gap intruding in the direction of the input and output resonators at the bottom cannot damage the through hole closest to the side of the filter, that is, the first through hole or the last through hole, that is, the metallization layer connected to the bottom surface, otherwise it will be damaged. The vias are electrically connected to the bottom.

Embodiment 1 of filter installation card holder:

See Figure 4 and Figure 5, including the installation card holder 3, the installation card slot 31 is provided on the top surface of the installation card holder 3, the filter body 1 is embedded and fixed in the installation card slot 31, and the opening of the gap 11 faces the installation card The seat 3 is provided with a through hole 32 corresponding to the slot 11 for installing the card seat 3 .

Wherein, the installation card seat can be made of silver-plated aluminum plate. In actual use, insert the filter into the installation card slot of the installation card holder, and the installation card holder is embedded in the user's circuit board and close to the user's metal ground. The setting of the installation card seat makes the connection between the filter and the circuit board convenient. The setting of the through hole is reserved to avoid covering the gap and affecting the installation of the filter on the circuit board.

Embodiment 2 of the filter mounting base:

Referring to Fig. 6 and Fig. 7 , a bottom plate 33 is also provided on the bottom surface of the installation card holder 3 . Other parts are the same as the third embodiment of the surface mount dielectric waveguide filter.

Wherein, the bottom plate can also be made of silver-plated aluminum plate.

Embodiment 3 of surface mount dielectric waveguide filter:

As shown in Fig. 5, it is assembled from the second embodiment of the surface-mount dielectric waveguide filter and the first embodiment of the filter mounting bracket.

The surface-mount dielectric waveguide filter is the above-mentioned surface-mount dielectric waveguide filter, and the filter mount is the above-mentioned filter mount, since the above-mentioned surface-mount dielectric waveguide filter and the filter mount have the above-mentioned As for the technical effect, the filter having the surface-mounted dielectric waveguide filter and the filter mounting holder also has the same technical effect.

Embodiment 4 of the surface mount dielectric waveguide filter:

As shown in Fig. 7, it is assembled from the second embodiment of the surface mount dielectric waveguide filter and the second embodiment of the filter mounting bracket.

The surface-mount dielectric waveguide filter is the above-mentioned surface-mount dielectric waveguide filter, and the filter mount is the above-mentioned filter mount, since the above-mentioned surface-mount dielectric waveguide filter and the filter mount have the above-mentioned As for the technical effect, the filter having the surface-mounted dielectric waveguide filter and the filter mounting holder also has the same technical effect.

Structural design method of surface mount dielectric waveguide filter:

According to the user's electrical performance and structural requirements, the circuit design can determine how many resonators are needed and whether to add a cross-coupling device, and calculate the external Q value and the coupling coefficient between the resonators; according to the structural size requirements, select the medium The dielectric constant of the material.

Establish a single-cavity three-dimensional structural model of HFSS, calculate the resonant frequency of the dielectric resonator, establish a three-dimensional structural model of HFSS double resonators, and calculate the diameter of the pin corresponding to each coupling coefficient; establish a three-dimensional model of HFSS with an excitation device for the first resonator , calculate the time delay value of S11, and determine the excitation structure of input and output.

Based on the structural parameters obtained in the above steps, a complete HFSS three-dimensional structural model of the filter is established, and all structural dimensions are parameterized, and HFSS automatically performs S21 and S11 simulations to generate its amplitude-frequency response.

Change the structural parameters manually or automatically, and repeat the curves of S21 and S11 calculated by HFSS until the design requirements are met.

The production method of the surface mount dielectric waveguide filter:

According to the structure of the filter, the corresponding mold is made, and the selected dielectric material powder is extruded from the mold and sintered according to the sintering process of the dielectric material; the input and output excitation gaps are protected by graphics and then metallized and electroplated. When the through hole is too small to be formed by the mold, it can be opened by a laser. The metallized dielectric body is the dielectric waveguide filter.

Embodiment one of the circuit board:

See Fig. 8, Fig. 10, Fig. 11, Fig. 12, a kind of circuit board, for the above-mentioned surface mount dielectric waveguide filter installation and use, including circuit board body 4 and the input/output microstrip line arranged on the circuit board body 4 5. The circuit board body 4 includes a copper foil layer 41, a dielectric layer 42, and an aluminum plate ground layer 43 connected sequentially from top to bottom. The copper foil layer 41 and the medium layer 42 are provided with mounting holes, and the aluminum plate large ground layer 43 is provided with convex holes. Platform 44, the boss 44 is arranged in the mounting hole 44 and the top surface of the boss 44 is set at the same height as the top surface of the copper foil layer 41. The corresponding connecting hole 45.

By setting the boss on the large ground layer of the aluminum plate of the circuit board, using the boss to cooperate with the gap, the electric field radiation of the gap is shielded, and finally the input/output microstrip line and the connector are welded together to realize the surface mount installation of the filter. Simple, easy filter and board connection, and easy to implement. The connection holes are recessed holes that give way to filter slots, and their inner surfaces are metallized.

It should be noted that the connecting hole is a blind hole, that is, a concave hole that cannot be opened. The shape of the connecting hole is the same as that of the gap. The shape of the top surface of the boss is the shape of the bottom surface of the filter without the gap. on the top of the table.

It should be pointed out that the circuit board in this embodiment is suitable for being connected with the surface-mount dielectric waveguide filters described in Embodiments 2, 3 and 4 of the surface-mount dielectric waveguide filter. Among them, when installing the surface-mount dielectric waveguide filter described in the second, third and fourth embodiments of the surface-mount dielectric waveguide filter, installation holes of different depths will be opened in the circuit board body, so that the installation card holder or the filter body can be embedded .

Embodiment two of the circuit board:

See Fig. 9, Fig. 10, Fig. 11, Fig. 12, a kind of circuit board, can be used for installation and use of above-mentioned surface-mounted dielectric waveguide filter, comprise circuit board body 4 and be arranged on the input/output circuit board body 4 With the strip line 5, the circuit board body 4 includes a copper foil layer 41, a dielectric layer 42 and an aluminum plate ground layer 43 sequentially connected from top to bottom. The circuit board body 4 is provided with a connection hole 45 corresponding to the slit 11, and the Grounding holes 46 are evenly provided on the board body, and the copper foil layer 41 , the dielectric layer 42 and the large ground layer 43 of the aluminum plate are electrically connected together through the connecting holes 45 and the grounding holes 46 .

Wherein, the connecting hole and the grounding hole are through holes metallized on the inner surface. By opening a connection hole through the circuit board body on the circuit board, the shape of the connection hole is the same as the gap, and using the circuit board sinking copper process at a specific position to completely electrically connect the upper and lower copper foil layers, the dielectric layer and the large ground layer of the aluminum board on the PCB. Connect them together, and finally weld the input/output microstrip line and the connector together to realize the surface mount installation of the surface mount dielectric waveguide filter, which has a simple structure and is easy to implement.

It should be noted that the connection hole is a blind hole, that is, a concave hole that cannot be opened, and the shape of the connection hole is the same as that of the gap. When installing, the filter is placed on the top surface of the boss.

It should be pointed out that the circuit board in this embodiment is suitable for being connected with the surface-mount dielectric waveguide filters described in Embodiments 2, 3 and 4 of the surface-mount dielectric waveguide filter. Wherein, when installing the surface-mount dielectric waveguide filter described in Embodiments 3 and 4 of the surface-mount dielectric waveguide filter, installation holes of different depths will be opened in the circuit board body for insertion of the installation socket.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A surface-mounted dielectric waveguide filter, comprising a filter body, is characterized in that: a surface metallization layer is provided on the outer surface of the filter body, and two slits are provided on the surface metallization layer, so that The filter body is in an exposed state at the gap. 2. The surface-mount dielectric waveguide filter according to claim 1, characterized in that: a connector electrically connected to the surface metallization layer is provided in the gap, and the connector is used to connect with the input/output micro Wired electrical connection. 3. The surface mount dielectric waveguide filter according to claim 2, characterized in that: the filter body is provided with two or more through holes on the same straight line, and the surface metallization layer The covered surface includes the inner surface of the through hole, the filter body includes a dielectric resonator and an input/output resonator, the dielectric resonator is arranged between adjacent through holes, and the input/output resonator It is arranged between a side of the filter body and a through hole adjacent to the side of the filter body. 4. The surface mount dielectric waveguide filter according to claim 3, characterized in that: blind holes are provided on the top surfaces of the dielectric resonator and the input/output resonator, and the blind holes and the slit are respectively It is arranged on the intersecting or opposite surfaces of the filter body. 5. The surface-mounted dielectric waveguide filter according to claim 3 or 4, wherein the slits are respectively arranged on opposite sides of the filter body, wherein the gap between the two slits The connecting line is arranged parallel to the straight line where the through hole is located. 6. The surface-mount dielectric waveguide filter according to claim 3 or 4, characterized in that: the slit is arranged on the bottom surface of the filter body, wherein the connecting line between the two slits and The straight lines where the through holes are located are arranged in parallel. 7. A filter mounting socket for installing the surface-mount dielectric waveguide filter according to claim 6, characterized in that: it includes a mounting socket, and the top surface of the mounting socket is provided with the filter The mounting card slot matched with the device body, and the opening of the gap faces the mounting socket, and the mounting socket is provided with a through hole corresponding to the gap. 8 . The filter mounting socket according to claim 7 , wherein a bottom plate is further provided on the bottom surface of the mounting socket. 9 . 9. A circuit board for installation of the surface-mount dielectric waveguide filter according to claim 6, or for installation of the filter mounting socket according to claim 7 or 8, characterized in that: it includes a circuit board body and a device The input/output microstrip line on the circuit board body, the circuit board body includes a copper foil layer, a dielectric layer and an aluminum plate ground layer connected in sequence from top to bottom, and the copper foil layer and the dielectric layer are provided with There is an installation hole, and a boss is provided on the large stratum of the aluminum plate, and the boss is arranged in the installation hole and the top surface of the boss is set at the same height as the top surface of the copper foil layer. Connection holes corresponding to the slits are opened on the circuit board body and located on both sides of the boss. 10. A circuit board for installation of the surface mount dielectric waveguide filter according to claim 6, or for installation of the filter mounting socket according to claim 7 or 8, characterized in that it includes a circuit board body and a device The input/output microstrip line on the circuit board body, the circuit board body includes a copper foil layer, a dielectric layer and an aluminum plate ground layer connected in sequence from top to bottom, and the circuit board body is provided with a The connection hole corresponding to the gap, and a ground hole is opened on the top surface of the circuit board body, and the copper foil layer, the dielectric layer and the large ground layer of the aluminum plate are electrically connected through the connection hole and the ground hole. connected.