CN213878362U

CN213878362U - Filter

Info

Publication number: CN213878362U
Application number: CN202023331286.1U
Authority: CN
Inventors: 廖明
Original assignee: Suzhou Fudian Communication Co ltd
Current assignee: Suzhou Fudian Communication Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-08-03
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a filter, including at least one first syntonizer, it sets up to the dielectric syntonizer, the dielectric syntonizer includes the dielectric block of cuboid form structure, the first surface of dielectric block is equipped with through hole, the internal surface in through hole is equipped with the inner conductor layer, other surfaces of dielectric block that lie in outside the first surface all are equipped with the outer conductor layer, the inner conductor layer with the outer conductor layer electric connection of dielectric block second surface, the second surface sets up with first surface relatively; and the at least one second resonator is arranged as an LC resonator and comprises a capacitor and an inductor which are connected in parallel, one end of the capacitor and one end of the inductor which are connected in parallel are grounded, and the other end of the capacitor and the other end of the inductor are electrically connected with the inner conductor layer. The utility model discloses a wave filter, under the prerequisite that does not increase the wave filter cost, can improve the outband rejection characteristic of wave filter to a certain extent, reduce the volume of wave filter simultaneously.

Description

Filter

Technical Field

The utility model relates to a communication device technical field, concretely relates to wave filter.

Background

The filter is used as a basic communication device and plays an important role in the field of mobile communication, and a full communication chain from a signal source, a channel, an antenna feed system, an antenna to a mobile terminal and the like needs to use the filter. With the mobile communication coming into the 5G era, distributed small base stations, large-scale array active antennas and the like become main solutions for network coverage, and higher requirements are put forward on miniaturization, high performance and low power consumption of filters. At present, a dielectric filter has the characteristics of large dielectric constant, high Q value, small loss, small temperature drift and the like, and has great advantages compared with the traditional filter, so the dielectric filter has wide application prospects in 5G communication equipment. However, the conventional dielectric filter has a complicated manufacturing process and a large volume while satisfying a certain out-of-band rejection characteristic.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a volume, cost and outband rejection characteristic homoenergetic meet the filter of requirement.

In order to solve the above technical problems, the present invention provides a filter, including,

the dielectric resonator is a dielectric resonator and comprises a dielectric block with a cuboid structure, a through hole is formed in the first surface of the dielectric block, an inner conductor layer is arranged on the inner surface of the through hole, outer conductor layers are arranged on the surfaces of the dielectric block, which are positioned outside the first surface, the inner conductor layers are electrically connected with the outer conductor layers on the second surface of the dielectric block, and the second surface is opposite to the first surface;

and the at least one second resonator is arranged as an LC resonator and comprises a capacitor and an inductor which are connected in parallel, one end of the capacitor and one end of the inductor which are connected in parallel are grounded, and the other end of the capacitor and the other end of the inductor are electrically connected with the inner conductor layer.

The utility model discloses a preferred embodiment, further include still include the PCB board, be equipped with signal transmission line on the PCB board, what the wave filter contained first syntonizer, second syntonizer all set up on the PCB board, just the inner conductor layer, and the equal electric connection of one end after electric capacity and inductance are parallelly connected signal transmission line.

In a preferred embodiment of the present invention, the first resonator and the second resonator are arranged side by side, and when the first resonators are multiple, the multiple first resonators are arranged symmetrically with respect to one of the first resonators or symmetrically with respect to one of the second resonators; when the number of the second resonators is plural, the plural second resonators are arranged with one of the second resonators as a center symmetry, or with one of the first resonators as a center symmetry.

In a preferred embodiment of the present invention, the inductor is a coil inductor, the coil inductor has a protruding portion, and the protruding portion is hollow inside; the capacitor is arranged below the coil inductor and is positioned at the hollow part inside the bulge part.

The utility model discloses a preferred embodiment, further include coil inductance's both ends respectively welded fastening on a pair of first pad of PCB board, the both ends respectively welded fastening of electric capacity extremely on a pair of first pad.

The utility model discloses a preferred embodiment, further include and still include coupling amount adjusting element, coupling amount adjusting element sets up on the PCB board, it is used for adjusting the coupling amount between two adjacent syntonizers.

In a preferred embodiment of the present invention, the coupling amount adjusting element is a coupling capacitor or a coupling inductor, and the coupling amount adjusting element is disposed between two adjacent resonators.

In a preferred embodiment of the present invention, it is further included that the coupling amount adjusting element is configured as a medium adjusting block.

The utility model discloses a preferred embodiment, further include coupling quantity adjusting element sets up to coupling capacitance and medium regulating block, the medium regulating block sets up on the PCB board, coupling capacitance, coupling inductance set up on the medium regulating block.

In a preferred embodiment of the present invention, the medium adjusting block further includes a rectangular parallelepiped medium body, two opposite surfaces of the medium body are each provided with a local conductor layer corresponding to each resonator, and an insulating gap is provided between the local conductor layers.

The utility model has the advantages that:

the utility model discloses a wave filter includes the syntonizer that a plurality of components of a whole that can function independently set up separately, and contain simultaneously in the syntonizer of constituteing the wave filter and set up to dielectric resonator's first syntonizer and set up to the second syntonizer of LC syntonizer, wherein, dielectric resonator's Q value is higher, and the volume of LC syntonizer is less, and the wave filter that from this designs can improve the outband rejection characteristic of wave filter to a certain extent under the prerequisite that does not increase the wave filter cost, reduces the volume of wave filter simultaneously.

Drawings

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

fig. 2 is a schematic diagram of a first resonator in the filter of fig. 1;

fig. 3 is a schematic diagram of a second resonator in the filter of fig. 1;

FIG. 4 is a schematic structural diagram of a filter in a second embodiment;

fig. 5 is a schematic structural diagram of a filter in the third embodiment.

The reference numbers in the figures illustrate:

2-first resonator, 21-dielectric block, 22-first surface, 23-through hole, 24-inner conductor layer, 25-outer conductor layer, 26-second surface;

4-second resonator, 41-capacitance, 42-inductance, 43-bump;

6-PCB board, 61-signal transmission line, 62-first pad, 63-coupling capacitor, 64-coupling inductor, 65-dielectric adjusting block, 66-dielectric body, 67-local conductor layer.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

It will be understood that when an element is referred to as being "disposed on," "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured" to, or "fixedly coupled" to another element, it can be removably secured or non-removably secured to the other element. When an element is referred to as being "connected," "pivotally connected," to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "up," "down," and the like are used for illustrative purposes only and are not meant to be the only real-time.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In the present invention, the terms "first", "second", "third", and the like are used for distinguishing names, rather than representing specific numbers and orders.

As shown in fig. 1-3, in one embodiment, the utility model discloses a split type filter that sets up, including PCB board, at least one first syntonizer and at least one second syntonizer, what the filter contained first syntonizer, second syntonizer all set up on the PCB board. The PCB board is provided with a signal transmission line, and the first resonator and the second resonator are arranged on the same side of the signal transmission line on the PCB board side by side. When the number of the first resonators is multiple, the multiple first resonators are symmetrically arranged by taking one of the first resonators as a center, or are symmetrically arranged by taking one of the second resonators as a center; when the number of the second resonators is plural, the plural second resonators are arranged with one of the second resonators as a center symmetry, or with one of the first resonators as a center symmetry. In this way, the symmetry of the filter passband is matched by the symmetry of the structure.

The filter shown in fig. 1 includes two first resonators and one second resonator, the second resonator is located at the center of the PCB, and the two first resonators are respectively located at two sides of the second resonator and symmetrically located. Of course, when the filter includes two second resonators and one first resonator, the first resonator is located at the center of the PCB, and the two second resonators are respectively located at both sides of the first resonator and symmetrically located.

Specifically, the first resonator is a dielectric resonator, the dielectric resonator includes a dielectric block of a rectangular parallelepiped structure die-cast and formed by a high dielectric constant material (such as ceramic), a first surface of the dielectric block is provided with a through hole, the through hole extends to a second surface of the dielectric block, the second surface is opposite to the first surface, an inner conductor layer is arranged on an inner surface of the through hole, other surfaces of the dielectric block, which are located outside the first surface, are provided with outer conductor layers, and the inner conductor layers are electrically connected with the outer conductor layers on the second surface of the dielectric block; the second resonator is an LC resonator and comprises a capacitor and an inductor which are connected in parallel, one end of the capacitor and the inductor which are connected in parallel is grounded, and the other end of the capacitor and the inductor which are connected in parallel is electrically connected with the inner conductor layer. In the above, the inner conductor layer and the outer conductor layer are metal film layers processed and manufactured based on a sputtering process, a soaking process or a printing process, and include a silver film layer, a copper film layer or a gold film layer. The dielectric resonator is fixed on the PCB through an outer conductor layer of the dielectric resonator in a soldering mode, a pair of first bonding pads is arranged on the PCB, one first bonding pad is arranged on the signal transmission line, two ends of the capacitor and the inductor are respectively welded and fixed to the pair of first bonding pads after the capacitor and the inductor are connected in parallel, and the inner conductor layer of the dielectric filter and one end of the capacitor and one end of the inductor after the capacitor and the inductor are connected in parallel are electrically connected with the signal transmission line.

The utility model discloses a wave filter includes the syntonizer that a plurality of components of a whole that can function independently set up separately, and contain simultaneously in the syntonizer of constituteing the wave filter and set up to the first syntonizer of dielectric resonator and set up to the second syntonizer of LC syntonizer, wherein, dielectric resonator's Q value is higher, and the volume of LC syntonizer is less, and the wave filter that from this designs can improve the outband rejection characteristic of wave filter to a certain extent under the prerequisite that does not increase the wave filter cost, reduces the volume of wave filter simultaneously.

Further, the inductor is a coil inductor, wherein the coil inductor may be formed by winding a hollow conducting wire, or by winding a conducting wire on a magnetic ring, or by winding a conducting wire on an insulating tube. As shown in fig. 3, the coil inductor has a raised portion, and the inner side of the raised portion is hollowed out; the capacitor is arranged below the coil inductor and is positioned at the hollow part inside the bulge part. Namely, the capacitor and the inductor are arranged in a laminated manner, so that the size of the filter in the width direction is further reduced, and the size of the filter is further reduced.

As a further improvement of the utility model, still include coupling volume adjusting element, coupling volume adjusting element sets up on the PCB board, coupling volume adjusting element sets up to the electric component that can adjust the coupling volume between two adjacent syntonizers, including coupling capacitance, coupling inductance or medium regulating block. In one embodiment, as shown in fig. 4, the coupling amount adjusting element is configured as a coupling capacitor or a coupling inductor, and usually uses a patch capacitor and a patch inductor, the PCB board is provided with a second pad located between two resonators along the signal transmission line, and the coupling capacitor or the coupling inductor is soldered on the second pad, where the coupling capacitor forms a capacitive coupling (or "negative coupling"), the coupling inductor forms an inductive coupling (or "positive coupling"), and the coupling amount between two resonators can be changed by matching the coupling capacitor with different capacitance or matching the coupling inductor with different inductance according to actual use requirements, so as to adjust the bandwidth of the filter.

In another embodiment, the coupling amount adjusting element is configured as a medium adjusting block, the medium adjusting block includes a rectangular parallelepiped medium body formed by die-casting and sintering a high dielectric constant material (such as ceramic), two opposite surfaces of the medium body are provided with local conductor layers corresponding to each resonator, an insulating gap is formed between the local conductor layers, and the local conductor layers are metal film layers, such as silver film layers, processed by a printing process or a laser process. The dielectric body and the partial conductor layers on the two opposite surfaces of the dielectric body form a coupling capacitor.

In other embodiments, as shown in fig. 5, the coupling amount adjusting element is configured as a coupling capacitor and a dielectric adjusting block, the dielectric adjusting block is disposed on the PCB, and the coupling capacitor and the coupling inductor are disposed on the dielectric adjusting block. The coupling quantity between the two resonators is roughly adjusted through the coupling capacitor, the coupling quantity between the two resonators is finely adjusted through the medium adjusting block, and the coupling quantity is adjusted in a mode that the patch capacitor is matched with the medium adjusting block, so that the coupling quantity can be adjusted with higher precision.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. A filter, characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

2. The filter of claim 1, wherein: the filter comprises a filter body and is characterized by further comprising a PCB, wherein a signal transmission line is arranged on the PCB, the filter comprises a first resonator and a second resonator which are arranged on the PCB, the inner conductor layer and one end of the parallel capacitor and the parallel inductor are electrically connected with the signal transmission line.

3. The filter of claim 2, wherein: the first resonators and the second resonators are arranged side by side, and when the number of the first resonators is multiple, the multiple first resonators are symmetrically arranged by taking one of the first resonators as a center, or symmetrically arranged by taking one of the second resonators as a center; when the number of the second resonators is plural, the plural second resonators are arranged with one of the second resonators as a center symmetry, or with one of the first resonators as a center symmetry.

4. A filter as claimed in claim 2 or 3, characterised in that: the inductor is a coil inductor, the coil inductor is provided with a bulge part, and the inner side of the bulge part is hollowed; the capacitor is arranged below the coil inductor and is positioned at the hollow part inside the bulge part.

5. The filter of claim 4, wherein: the two ends of the coil inductor are respectively welded and fixed on the pair of first bonding pads of the PCB, and the two ends of the capacitor are respectively welded and fixed on the pair of first bonding pads.

6. The filter of claim 2, wherein: the PCB further comprises a coupling amount adjusting element, wherein the coupling amount adjusting element is arranged on the PCB and is used for adjusting the coupling amount between two adjacent resonators.

7. The filter of claim 6, wherein: the coupling amount adjusting element is provided as a coupling capacitor or a coupling inductor, and the coupling amount adjusting element is provided between two adjacent resonators.

8. The filter of claim 6, wherein: the coupling amount adjusting element is provided as a medium adjusting block.

9. The filter of claim 6, wherein: the coupling quantity adjusting element is set to be a coupling capacitor and a medium adjusting block, the medium adjusting block is arranged on the PCB, and the coupling capacitor and the coupling inductor are arranged on the medium adjusting block.

10. A filter as claimed in claim 8 or 9, characterised in that: the dielectric adjusting block comprises a cuboid-shaped dielectric body, two opposite surfaces of the dielectric body are provided with local conductor layers corresponding to each resonator, and an insulating gap is formed between the local conductor layers.