CN210468052U - Dielectric filter - Google Patents

Abstract

The utility model discloses a dielectric filter, it includes support plate and dielectric body, the surface of support plate is provided with one or two impedance gradual change structures, the signal input part and/or the signal output part of dielectric body with impedance gradual change structure electricity is connected, thereby passes through impedance gradual change structure can reduce signal input output's loss, has obviously improved dielectric filter's performance. Moreover, the impedance gradual change structure comprises a transmission line and an impedance gradual change line, and the impedance gradual change line is in a trapezoidal structure, a stepped structure, a coplanar waveguide structure, a concave-convex staggered structure and the like, so that different impedance gradual change lines can be selected according to the signal input and output requirements, and the dielectric filter can be better matched with a system.

Description

Dielectric filter

Technical Field

The utility model relates to a wave filter technical field especially relates to dielectric filter.

Background

With the continuous development of modern communication technology, the requirements on filters are higher and higher, and a small-size, high-performance, high-power and low-cost filter technology is particularly important for filters in wireless communication applications.

The dielectric filter is made of a dielectric ceramic material, and has the advantages of low loss, high dielectric constant, small frequency temperature coefficient and thermal expansion coefficient, high power bearing capacity and the like, so the dielectric filter is widely applied to the 5G communication technology, but the dielectric filter is required to be mounted on a PCB (printed circuit board) when in use, and the input and output impedance of the dielectric filter cannot be well controlled.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dielectric filter, its input/output impedance that can control dielectric filter, and then improve signal transmission's precision.

In order to solve the above technical problem, the utility model discloses the technical scheme content that adopts specifically as follows:

the dielectric filter comprises a carrier plate and a dielectric body, wherein one or two impedance gradual change structures are arranged on the surface of the carrier plate, and a signal input end and/or a signal output end of the dielectric body are/is electrically connected with the impedance gradual change structures.

Preferably, the signal input terminal and/or the signal output terminal of the dielectric body is provided with a metal wire, and the signal input terminal and/or the signal output terminal of the dielectric body is electrically connected to the impedance gradual change structure through the metal wire.

Preferably, the impedance gradual change structure includes a transmission line and an impedance gradual change line connected to the transmission line, the transmission line is used for connecting an external connector, and the impedance gradual change line is electrically connected to the metal line.

Preferably, the impedance gradient is a ladder structure, a coplanar waveguide structure, or a concavo-convex staggered structure.

Preferably, the carrier includes a PCB substrate, a copper layer is disposed on a surface of the PCB substrate, and the copper layer and the impedance gradual change structure are integrally formed or welded together.

Preferably, the dielectric body includes a body, a metal layer is provided on a surface of the body, and the metal layer and the metal wire are integrally molded or welded together.

Preferably, the body comprises at least one ceramic lamination body, and the at least one ceramic lamination body is welded together in a laminated manner.

Preferably, the metal layer is a copper layer or a silver layer.

Preferably, the edge of the body is a rounded edge.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model discloses a dielectric filter's support plate surface is provided with one or two impedance gradual change structures, and the signal input part and/or the signal output part of dielectric body with impedance gradual change structure electricity is connected, thereby passes through impedance gradual change structure can reduce dielectric body signal input output's loss has obviously improved dielectric filter's performance.

2. The impedance gradual change structure comprises a transmission line and an impedance gradual change line, and the impedance gradual change line is in a trapezoidal structure, a stepped structure, a coplanar waveguide structure, a concave-convex staggered structure and the like, so that different impedance gradual change lines can be selected according to the signal input and output requirements, and the dielectric filter can be better matched with a system.

3. The edge of the body is a rounded edge, so that when the metal wire extends to the side edge of the dielectric body, the metal wire can be reduced from being worn, and the continuity of the metal wire is ensured; and, also be favorable to forming the metal layer of even thickness on the surface of body.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic structural diagram of a first preferred embodiment of a dielectric filter according to the present invention;

FIG. 2 is a schematic structural diagram of a carrier when an impedance gradient line is a trapezoid structure and two impedance gradient structures are disposed at the same end;

FIG. 3 is a schematic structural diagram of a carrier when an impedance gradient line is a trapezoid structure and two impedance gradient structures are disposed at two ends;

FIG. 4 is a schematic structural diagram of a carrier when an impedance gradient line is a stepped structure and two impedance gradient structures are disposed at the same end;

FIG. 5 is a schematic structural diagram of a carrier board with a stepped impedance gradient and two gradually-changed impedance structures disposed at two ends;

FIG. 6 is a schematic structural diagram of a carrier plate with two impedance gradually-changing structures disposed at the same end, wherein the impedance gradually-changing lines are coplanar waveguide structures;

FIG. 7 is a schematic structural diagram of a carrier plate with two impedance gradient structures disposed at two ends, wherein the impedance gradient lines are coplanar waveguide structures;

wherein the reference symbols are:

1. a carrier plate; 2. a dielectric body; 3. a transmission line; 4. an impedance gradient; 5. a metal wire; 6. and an impedance gradual change structure.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description is given to the embodiments, structures, features and effects according to the present invention with reference to the accompanying drawings and preferred embodiments as follows:

the first embodiment is as follows:

as shown in fig. 1, the utility model discloses a dielectric filter, including support plate 1 and dielectric body 2, the surface of support plate 1 is provided with two impedance gradual change structures 6, the signal input part and the signal output part of dielectric body 2 respectively with two impedance gradual change structures 6 electricity is connected to pass through impedance gradual change structure 6 just can reduce signal input output's loss, has obviously improved dielectric filter's performance.

In order to facilitate the electrical connection between the signal input terminal and the signal output terminal of the dielectric body 2 and the two impedance gradually-changing structures 6, the signal input terminal and the signal output terminal of the dielectric body 2 are both provided with metal wires 5, and the signal input terminal and the signal output terminal of the dielectric body 2 are electrically connected to the two impedance gradually-changing structures 6 through the metal wires 5, specifically, in this embodiment, the metal wires 5 may be only disposed on the bottom surface of the dielectric body, or may be disposed on the bottom surface of the dielectric body and extend to the side surfaces of the dielectric body.

In this embodiment, since the surface of the dielectric body 2 needs to be provided with blind holes and metallized, the metal lines 5 provided at the signal input terminal and the signal output terminal of the dielectric body 2 are formed by extending metal lines from the metallized blind holes.

The impedance gradual change structure 6 comprises a transmission line 3 and an impedance gradual change line 4 connected with the transmission line 3, the transmission line 3 is used for connecting an external connector, and the impedance gradual change line 4 is electrically connected with the metal wire 5; in order to ensure stability after the gradual resistance change line 4 is electrically connected to the metal wire 5, the gradual resistance change line 4 and the metal wire 5 are welded together.

It should be noted that, in the present invention, two impedance gradually-varying structures 6 are disposed at two ends of the carrier plate 1 or at the same end according to the condition that the signal input end and the signal output end of the dielectric body 2 are located at the same side or both sides.

In order to ensure that the dielectric filter and the system have better matching, different impedance gradients can be selected according to signal input and output requirements, as shown in fig. 2 and 3, the impedance gradients are in a trapezoidal structure, so that the reflection loss in a required frequency band is reduced by adjusting the width of the impedance gradients; alternatively, as shown in fig. 4 and 5, the impedance gradient has a step-shaped structure, so that a wider bandwidth is obtained through multi-step impedance transformation; or, as shown in fig. 6 and 7, the impedance gradient is in a coplanar waveguide type structure, so that the quality factor of the carrier plate 1 is improved by adjusting the length of the gap; or, impedance gradient line is unsmooth staggered structure to form special notch cuttype structure, increase the bandwidth, during specific setting, unsmooth staggered structure includes wavy curve structure etc..

In the present invention, the carrier plate 1 includes a PCB substrate, a copper layer is disposed on a surface of the PCB substrate, and the copper layer and the impedance gradual change structure are integrally formed, because copper has good electrical conductivity, the loss of the carrier plate 1 can be reduced; moreover, copper has good ductility, can be tightly combined with the PCB substrate, and has high reliability in reflow soldering and high-temperature work; in addition, the processes of electroplating copper and etching metal copper patterns are mature, and the processing cost is low.

Specifically, the PCB substrate is made of Rogers material and has a thickness of 30 mil; moreover, the surface of the copper layer is also provided with a plating layer, the plating layer not only can improve the welding effect of the carrier plate 1, but also can prevent the copper layer from being oxidized, and the plating layer can be made of gold immersion or tin, because the gold immersion and the tin have higher conductivity and small loss; however, since the tin is sprayed during soldering and affects the performance of the soldering equipment, the plating layer is preferably made of gold immersion.

In other embodiments, the graded impedance structure 6 is soldered to the copper layer.

In the present invention, the dielectric body includes a body, a metal layer is provided on a surface of the body, and the metal layer and the metal wire are integrally formed.

In other embodiments, the metal layer and the metal wire are welded together.

The body comprises at least one ceramic attaching body, the at least one ceramic attaching body is welded together in a stacking mode, and specifically, when the number of the ceramic attaching bodies is at least two, one side of at least two ceramic attaching bodies is aligned and welded together in a stacking mode.

Specifically, the metal layer is a copper layer or a silver layer, which is because of high conductivity of copper and silver, mature processing conditions, and easily available raw materials.

Moreover, because the surface of the ceramic attaching body needs to be metallized to form a metal layer, in order to facilitate the formation of the metal layer with uniform thickness on the surface of the body, the edge of the body is a rounded edge, and when the metal wire 5 extends to the side edge of the dielectric body 2, the rounded edge can reduce the abrasion to the metal wire 5, so as to ensure the continuity of the metal wire 5.

Example two:

the present embodiment is different from the first embodiment only in that: the surface of the carrier plate 1 is provided with an impedance gradual change structure 6, and the signal input end or the signal output end of the dielectric body 2 is electrically connected with the impedance gradual change structure 6.

In addition, in order to facilitate the electrical connection between the signal input end or the signal output end of the dielectric body 2 and the impedance gradual change structure 6, a metal wire 5 is disposed on the signal input end or the signal output end of the dielectric body 2, and the signal input end or the signal output end of the dielectric body 2 is electrically connected to the impedance gradual change structure 6 through the metal wire 5.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims (9)

1. A dielectric filter, characterized by: the carrier plate comprises a carrier plate and a dielectric body, wherein one or two impedance gradual change structures are arranged on the surface of the carrier plate, and a signal input end and/or a signal output end of the dielectric body are/is electrically connected with the impedance gradual change structures.

2. A dielectric filter as recited in claim 1, wherein: and the signal input end and/or the signal output end of the dielectric body are/is electrically connected with the impedance gradual change structure through the metal wires.

3. A dielectric filter as recited in claim 2, wherein: the impedance gradual change structure comprises a transmission line and an impedance gradual change line connected with the transmission line, the transmission line is used for being connected with an external connector, and the impedance gradual change line is electrically connected with the metal wire.

4. A dielectric filter as recited in claim 3, wherein: the impedance gradient is in a trapezoidal structure, a stepped structure, a coplanar waveguide structure or a concave-convex staggered structure.

5. A dielectric filter as recited in claim 1, wherein: the carrier plate comprises a PCB substrate, a copper layer is arranged on the surface of the PCB substrate, and the copper layer and the impedance gradual change structure are integrally formed or welded together.

6. A dielectric filter according to any one of claims 2-4, characterized in that: the dielectric body comprises a body, a metal layer is arranged on the surface of the body, and the metal layer and the metal wire are integrally formed or welded together.

7. The dielectric filter of claim 6, wherein: the body comprises at least one ceramic fitting body, and the at least one ceramic fitting body is welded together in a laminated mode.

8. The dielectric filter of claim 6, wherein: the metal layer is a copper layer or a silver layer.

9. The dielectric filter of claim 6, wherein: the edge of the body is a chamfered edge.

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