CN210111006U

CN210111006U - Coupling structure for improving harmonic performance of filter and filter

Info

Publication number: CN210111006U
Application number: CN201921066800.8U
Authority: CN
Inventors: 何进军; 蔡文新; 陈鹏; 韦俊杰
Original assignee: Chongqing Si Ruchuang Porcelain Electric Technology Co Ltd
Current assignee: Chongqing Si Ruchuang Porcelain Electric Technology Co Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2020-02-21
Anticipated expiration: 2029-07-09

Abstract

The utility model relates to a wave filter technical field specifically is a coupling structure and wave filter, this coupling window of improving wave filter harmonic performance the coupling window sets up the border at the medium body. The coupling window is in the shape of a bar, an L or Contraband. The coupling windows are symmetrically distributed along the central axis of the dielectric body. The coupling window is a coupling window of main path coupling or a coupling window of cross coupling. The utility model provides a pair of improve coupling structure and wave filter of wave filter harmonic performance can let the harmonic keep away from the wave filter passband, reduces the loss and the manufacturing process complexity of wave filter, reduce cost.

Description

Coupling structure for improving harmonic performance of filter and filter

Technical Field

The utility model relates to a wave filter technical field specifically is a coupling structure and wave filter of improving wave filter harmonic performance.

Background

In the design of the filter, not only the cavity itself can generate higher-order mode harmonics, but also the coupling structure can generate resonance. In particular, in a broadband laminated waveguide filter, harmonics generated by the coupling structure are often closer to the passband of the filter than higher-order mode harmonics of the cavity itself. The harmonics of the coupling structure can have a significant impact on the overall performance of the filter, which presents significant challenges to the design of the low pass filter.

SUMMERY OF THE UTILITY MODEL

The utility model provides an improve coupling structure and wave filter of wave filter harmonic performance can let the harmonic keep away from the wave filter passband, reduces the loss and the manufacturing process complexity of wave filter, reduce cost.

In order to solve the technical problem, the present application provides the following technical solutions:

a coupling structure for improving the harmonic performance of a filter comprises a coupling window, wherein the coupling window is arranged at the edge of a dielectric body.

In the technical scheme of the utility model, the coupling window is arranged at the edge of the dielectric body, because the electric field in the middle of the dielectric body is very strong, the electric field is weaker toward the edge, the magnetic field strength of the edge is stronger, the magnetic field is weaker toward the center, the coupling window is arranged at the edge of the dielectric body, the electric field distribution is very small, the electric coupling is very weak, the main coupling is magnetic coupling, the arrangement can lead the harmonic wave brought by the coupling window to be more far away from the passband of the filter, the pressure of the low-pass filter used by the system is reduced, and the overall performance is improved; after the structure is applied to the filter, under the requirement of the same far-end inhibition, the number of levels and zeros of the low-pass filter can be reduced, the loss of the whole filter and the complexity of the manufacturing process are reduced, and therefore the cost is saved.

Further, the coupling window is bar-shaped.

Further, the coupling window is L-shaped.

Further, the coupling window is Contraband type.

Furthermore, the coupling windows are symmetrically distributed along the central axis of the dielectric body.

Further, the coupling window is a coupling window for main path coupling.

Further, the coupling windows are cross-coupled coupling windows.

Further, the application also discloses a filter for improving the harmonic performance of the filter, and the filter uses the coupling structure.

By applying the coupling structure, the harmonic wave of the filter can be far away from the passband of the filter, the number of levels and zeros of the low-pass filter can be reduced for the filter with the same far-end rejection requirement, the loss of the whole filter and the complexity of the manufacturing process are reduced, and therefore the cost is saved.

Further, the main path coupling window of the filter uses the above-described coupling structure.

Further, the cross-coupling window of the filter uses the above-described coupling structure.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of a coupling structure for improving harmonic performance of a filter according to the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of a coupling structure for improving harmonic performance of a filter according to the present invention;

fig. 3 is a schematic structural diagram of a third embodiment of a coupling structure for improving the harmonic performance of a filter according to the present invention;

fig. 4 is a schematic structural diagram of a fourth embodiment of a coupling structure for improving the harmonic performance of a filter according to the present invention;

fig. 5 is a schematic structural diagram of a fifth embodiment of a coupling structure for improving the harmonic performance of a filter according to the present invention;

fig. 6 is a schematic structural diagram of a sixth embodiment of a coupling structure for improving harmonic performance of a filter according to the present invention;

fig. 7 is a schematic structural diagram of a seventh embodiment of a filter according to the present invention;

fig. 8 is a schematic diagram of the electric field intensity distribution of the dielectric body in the embodiment of the coupling structure for improving the harmonic performance of the filter according to the present invention;

fig. 9 is a schematic diagram of the magnetic field intensity distribution of the dielectric body in an embodiment of a coupling structure for improving the harmonic performance of a filter according to the present invention;

FIG. 10 is a graph of a simulation of a prior art filter;

fig. 11 is a simulation graph of the filter of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

the reference numbers in the drawings of the specification include: the dielectric element comprises a dielectric body 1, a coupling window 2, a first body 3, a second body 4, a first resonance part 5, a second resonance part 6, a third resonance part 7, a fourth resonance part 8, a fifth resonance part 9, a sixth resonance part 10, a cross-coupling window 11, a through hole 12 and a second cross-coupling window 13.

Example one

As shown in fig. 1, the coupling structure of the present embodiment for improving the harmonic performance of a filter is disposed between two dielectric bodies 1, and is used for realizing the coupling of the resonance parts on the two dielectric bodies 1, and the coupling structure includes coupling windows 2 disposed at corresponding positions on the contact surfaces of the two dielectric bodies 1, and the coupling windows 2 are disposed at the edges of the dielectric bodies 1.

In this embodiment, the coupling window 2 is a strip and is disposed on one side of the surface of the resonance portion in a manner shown in fig. 1, specifically, the dielectric body 1 is made of ceramic, a conductive layer covers the surface of the dielectric body, and the position of the coupling window 2 has no conductive layer.

The coupling window 2 is arranged at the edge of the dielectric body 1, as shown in fig. 8 and 9, the electric field in the middle of the dielectric body 1 is very strong, the electric field towards the edge is weaker, the magnetic field at the edge is strong, the magnetic field towards the center is weaker, the coupling window 2 is arranged at the edge of the ceramic block, the coupling window 2 can be opened at the strongest part of the magnetic field, the electric field distribution at the position is very small, the electric coupling is very weak, the main coupling is magnetic coupling, the arrangement can enable the harmonic wave brought by the coupling window 2 to be far away from the passband of the filter, reduce the pressure on the low-pass filter used by the system and improve the overall performance; after the structure is applied to the filter, under the requirement of the same far-end inhibition, the number of levels and zeros of the low-pass filter can be reduced, the loss of the whole filter and the complexity of the manufacturing process are reduced, and therefore the cost is saved.

Example two

The present embodiment is different from the first embodiment in that two coupling windows 2 are provided on the surface of the resonance part, and are symmetrically arranged along the central axis of the dielectric body 1, as shown in fig. 2.

EXAMPLE III

As shown in fig. 3, the difference between this embodiment and the second embodiment is that in this embodiment, an Contraband-type coupling interface is disposed on the surface of the resonance part, which is composed of three connected strip-shaped windows disposed on the three edges of the overlapping surface of the dielectric body 1.

Example four

As shown in fig. 4, the present embodiment is different from the third embodiment in that in the present embodiment, three bar windows constituting the Contraband-type coupling interface are not connected.

EXAMPLE five

As shown in fig. 5, the difference between this embodiment and the first embodiment is that in this application, the surface of the resonance part is provided with an L-shaped coupling window 2, which is communicated by two strip-shaped windows with the same length, and is disposed at the edge of one corner of the overlapping surface of the medium body 1.

EXAMPLE six

As shown in fig. 6, the present embodiment is different from the fifth embodiment in that two L-shaped coupling windows 2 are provided on the surface of the resonance part, and the two L-shaped coupling windows 2 are respectively provided on the edges of two corners of the overlapping surface of the dielectric body 1.

EXAMPLE seven

As shown in fig. 7, the present embodiment discloses a filter, which includes a plurality of dielectric bodies 1 combined together, a conductive layer covers a surface of the dielectric body 1, the dielectric body 1 includes a plurality of resonance portions arranged, a coupling window 2, an input interface and an output interface are disposed on the dielectric body 1, and the position of the coupling window 2 has no conductive layer.

In this embodiment, the dielectric body 1 is made of a ceramic material, the dielectric body 1 includes a first body 3 and a second body 4, a silver layer is used as a conductive layer, the first body 3 includes a second resonance portion 6, a first resonance portion 5 and a sixth resonance portion 10, which are sequentially arranged, an input interface is disposed in the first resonance portion 5, an output interface is disposed in the sixth resonance portion 10, and the second body 4 includes a third resonance portion 7, a fourth resonance portion 8 and a fifth resonance portion 9, which correspond to the second resonance portion 6, the first resonance portion 5 and the sixth resonance portion 10. Main path coupling is provided between second resonator portion 6 and third resonator portion 7, and between fifth resonator portion 9 and sixth resonator portion 10, cross-coupling windows 11 are provided between first resonator portion 5 and second resonator portion 6, and corresponding cross-coupling windows 11 are provided between third resonator portion 7 and fourth resonator portion 8. The coupling structure of the cross coupling and the main path coupling may adopt any one of the coupling structures of the first to fifth embodiments.

In this embodiment, the coupling between the second resonance part 6 and the third resonance part 7 adopts the coupling structure in the second embodiment, that is, two strip-shaped coupling windows 2 are opened on the overlapping surface of the second resonance part 6 and the third resonance part 7, and the two strip-shaped coupling windows 2 are symmetrically arranged on the two edges of the overlapping surface along the axis of the first body 3. The coupling structure in the fourth embodiment is adopted between the fifth resonance part 9 and the sixth resonance part 10, and in addition to the two symmetrically arranged strip-shaped windows, one strip-shaped window is opened at the edge of the fifth resonance part 9 and the edge of the sixth resonance part 10 close to the end part. A pair of corresponding coupling windows 2 are arranged between the first resonance part 5 and the second resonance part 6 and between the third resonance part 7 and the fourth resonance part 8, the coupling windows 2 also adopt the arrangement mode of the second embodiment, and because the through holes 12 for isolating the resonance parts are arranged before the first resonance part 5 and the second resonance part 6 and before the third resonance part 7 and the fourth resonance part 8, the coupling windows 2 are arranged on the inner edge close to the through holes 12. The fourth resonance part 8 and the first resonance part 5 are cross-coupled, and the fourth resonance part 8 and the first resonance part 5 are both provided with second cross-coupling windows 13, in the present embodiment, the cross-coupling is electrically coupled, so the coupling windows 13 are arranged in the middle of the dielectric body 1, in the present embodiment, the coupling windows 13 are square.

By applying the coupling structure of the present application, as shown in fig. 10 and fig. 11, fig. 10 is a simulation graph of a conventional filter using electric coupling as main path coupling, and fig. 11 is a simulation graph of the filter of the present embodiment, it can be seen that, by the design of the present embodiment, the harmonic is pushed away from 4320MHz-4419MHz to 4885MHz-4947MHz, so that the harmonic of the filter can be far away from the pass band of the filter, and for the filter with the same far-end rejection requirement, the number of stages and zeros of the low-pass filter can be reduced, and the loss and the complexity of the manufacturing process of the entire filter can be reduced, thereby saving the cost.

The above are only embodiments of the present invention, and the present invention is not limited to the field related to this embodiment, and the common general knowledge of the known specific structures and characteristics in the scheme is not described too much, and those skilled in the art know the common technical knowledge in the technical field of the present invention before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the scheme, and some typical known structures or known methods should not become the obstacles for those skilled in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. A coupling structure for improving harmonic performance of a filter, comprising a coupling window, wherein: the coupling window is arranged at the edge of the dielectric body.

2. A coupling structure for improving the harmonic performance of a filter according to claim 1, wherein: the coupling window is in the shape of a bar.

3. A coupling structure for improving the harmonic performance of a filter according to claim 1, wherein: the coupling window is L-shaped.

4. A coupling structure for improving the harmonic performance of a filter according to claim 1, wherein: the coupling window is model Contraband.

5. A coupling structure for improving the harmonic performance of a filter according to any of claims 1-4, characterized in that: the coupling windows are symmetrically distributed along the central axis of the dielectric body.

6. The coupling structure of claim 5 for improving harmonic performance of a filter, wherein: the coupling window is a coupling window coupled with the main path.

7. The coupling structure of claim 5 for improving harmonic performance of a filter, wherein: the coupling windows are cross-coupled coupling windows.

8. A filter, characterized by: use of a coupling structure according to any of claims 1-4 for improving the harmonic performance of a filter.

9. A filter according to claim 8, wherein: the main path coupling window of the filter uses a coupling structure for improving the harmonic performance of the filter according to any of claims 1-4.

10. A filter according to claim 9, wherein: the cross-coupling window of the filter uses a coupling structure according to any of claims 1-4 for improving the harmonic performance of the filter.