阅读说明：本技术 一种单块三模介质滤波器 (Single-block three-mode dielectric filter ) 是由 何进军 韦俊杰 陈鹏 李朝勇 于 2020-04-30 设计创作，主要内容包括：本发明涉及通信设备组件的技术领域,具体为一种单块三模介质滤波器,包括至少两个三模谐振器,还包括至少一个中间块,中间块的两侧分别与三模谐振器耦合,中间块为单模谐振器,中间块与三模谐振器通过锡膏或银浆连接,三模谐振器与中间块的表面覆有导电屏蔽层,中间块与三模谐振器上的耦合处均开设有耦合窗口,耦合窗口为方形或环形,位于外侧的三模谐振器上设置有耦合输入端口,位于外侧的另一三模谐振器上设置有耦合输出端口。采用本方案以解决现有技术中三模介质滤波器对远端谐波抑制能力不足的技术问题。(The invention relates to the technical field of communication equipment components, in particular to a single-block three-mode dielectric filter which comprises at least two three-mode resonators and at least one middle block, wherein two sides of the middle block are respectively coupled with the three-mode resonators, the middle block is a single-mode resonator, the middle block is connected with the three-mode resonators through tin paste or silver paste, conductive shielding layers are covered on the surfaces of the three-mode resonators and the middle block, coupling windows are respectively arranged at the coupling positions of the middle block and the three-mode resonators, the coupling windows are square or annular, a coupling input port is arranged on the three-mode resonator positioned on the outer side, and a coupling output port is arranged on the other three-mode resonator positioned on the outer side. By adopting the scheme, the technical problem that the three-mode dielectric filter in the prior art is insufficient in far-end harmonic suppression capacity is solved.)

1. A monolithic three-mode dielectric filter comprising at least two three-mode resonators, characterized by: the three-mode resonator further comprises at least one middle block, and two sides of the middle block are respectively coupled with the three-mode resonators.

2. A monolithic three-mode dielectric filter according to claim 1, wherein: the middle block is a single mode resonator.

3. A monolithic three-mode dielectric filter according to claim 1, wherein: the surfaces of the three-mode resonator and the middle block are covered with conductive shielding layers, and coupling windows are formed in the coupling positions of the middle block and the three-mode resonator.

4. A monolithic three-mode dielectric filter according to claim 3, wherein: the coupling window is square or annular.

5. A monolithic three-mode dielectric filter according to claim 3, wherein: the conductive shielding layer is a metal conductive shielding layer.

6. A monolithic three-mode dielectric filter according to claim 5, wherein: the middle block is connected with the three-mode resonator through solder paste or silver paste.

7. A monolithic three-mode dielectric filter according to claim 6, wherein: the middle block is connected with the three-mode resonator through welding.

8. A monolithic three-mode dielectric filter according to claim 4, wherein: the coupling windows are strip-shaped, and the number of the coupling windows on the middle block and the three-mode resonator is two.

9. A monolithic three-mode dielectric filter according to claim 8, wherein: the coupling windows are respectively arranged on the middle block and the edges of the three-mode resonator.

10. A monolithic three-mode dielectric filter according to claim 1, wherein: and a coupling input port is arranged on the three-mode resonator positioned on the outer side, and a coupling output port is arranged on the other three-mode resonator positioned on the outer side.

Technical Field

The invention relates to the technical field of communication equipment components, in particular to a monolithic three-mode dielectric filter.

Background

With the development of wireless communication technology, wireless communication equipment increasingly pursues miniaturization, and compared with a traditional metal cavity waveguide filter, a dielectric waveguide filter has the advantages of small size, small insertion loss, large bearing power, low cost and the like, and is suitable for wireless base stations, radio frequency terminals, radio frequency or microwave transceiving components and other equipment. The existing dielectric waveguide filter is generally a single-mode dielectric waveguide filter, and in the using process, only a single resonance mode is provided, and if a plurality of resonance modes need to be realized, the realization can be realized only by combining a plurality of single-mode filters together. Among them, the three-mode dielectric waveguide filter is most widely used.

The three-mode dielectric waveguide filter generally comprises two or more three-mode resonators, taking the two three-mode resonators as an example, coupling windows are usually formed in two opposite side surfaces of the two three-mode resonators, and the two three-mode resonators are coupled through the coupling windows, so that coupling of different resonance modes is realized. However, experiments show that the three-mode dielectric waveguide filter has poor far-end harmonic and insufficient suppression degree on interference signals.

Disclosure of Invention

The invention aims to provide a single three-mode dielectric filter to solve the technical problem that the three-mode dielectric filter in the prior art is insufficient in far-end harmonic suppression capability.

The basic scheme provided by the invention is as follows: a monolithic three-mode dielectric filter comprising at least two three-mode resonators: the three-mode resonator further comprises at least one middle block, and two sides of the middle block are respectively coupled with the three-mode resonators.

The beneficial effects of the basic scheme are as follows: the middle block is respectively coupled with the three-mode resonators, resonance mode energy in the three-mode resonators is coupled into the middle block, and then the middle block is coupled into the other three-mode resonator. Therefore, the crosstalk between the three-mode resonators is eliminated, the suppression capability of far-end harmonic waves is improved, and the improvement effect is obvious.

Further, the middle block is a single mode resonator. Has the advantages that: the middle block adopts a single-mode resonator, and a transition single-mode resonator is added between two three-mode resonators through simulation design, so that the higher-order mode resonance frequency of the transition single-mode resonator is far; on the premise of not greatly increasing the volume of the whole ceramic filter, the number of filter stages is increased, and parasitic coupling generated at the mode passing coupling position between different three-mode resonators is reduced, so that the far-end rejection of the multi-mode filter is improved. The coupling between the single-mode resonator and the three-mode resonator is realized through the single-mode resonator, the technology of the single-mode resonator is mature, and the coupling between the single-mode resonator and the three-mode resonator is conveniently and quickly realized.

Further, the surfaces of the three-mode resonator and the middle block are covered with conductive shielding layers, and coupling windows are formed in coupling positions of the middle block and the three-mode resonator. Has the advantages that: the conductive shielding layer can shield interference of external electromagnetic energy, and the coupling of the middle block and the three-mode resonator is realized through the coupling window, so that crosstalk between the three-mode resonators is eliminated, and the suppression capability of far-end harmonic waves is improved.

Further, the coupling window is square or annular. Has the advantages that: with this arrangement, coupling through the coupling window is achieved.

Further, the conductive shielding layer is a metal conductive shielding layer. Has the advantages that: compared with the conventional conductive shielding layer, the metal conductive shielding layer has better electromagnetic shielding effect.

Further, the middle block is connected with the three-mode resonator through tin paste or silver paste. Has the advantages that: the middle block and the three-mode resonator are connected through the solder paste and the silver paste, so that the three-mode resonator is convenient to use and easy to assemble.

Further, the middle block and the three-mode resonator are connected through welding. Has the advantages that: the middle block and the three-mode resonator are connected through welding, the technology is mature, and the use is convenient.

Furthermore, the coupling windows are strip-shaped, and the number of the coupling windows on the middle block and the three-mode resonator is two. Has the advantages that: with this arrangement, coupling through the coupling window is achieved.

Further, coupling windows are provided at edges on the middle block and the three-mode resonator, respectively. Has the advantages that: the coupling window is arranged on the edges of the middle block and the three-mode resonators, harmonic waves brought by the coupling window are far away from the passband of the filter through the arrangement, the pressure of the system for using the filter is reduced, the overall performance is improved, therefore, crosstalk among the three-mode resonators is eliminated, and the suppression capability of far-end harmonic waves is improved.

Further, a coupling input port is arranged on the three-mode resonator positioned on the outer side, and a coupling output port is arranged on the other three-mode resonator positioned on the outer side. Has the advantages that: when a plurality of three-mode resonators exist, the three-mode resonators are connected through the middle block, the head ends and the tail ends of the three-mode resonators are outer sides, the two three-mode resonators located on the outer sides respectively input harmonic waves and output harmonic waves, the coupling input port is set to be an input harmonic wave providing port, and the coupling output port is set to be an output harmonic wave providing port.

Drawings

FIG. 1 is a schematic structural diagram of a monolithic three-mode dielectric filter according to a first embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a two-bar coupling window of an embodiment of a monolithic three-mode dielectric filter according to the present invention;

FIG. 3 is a graph of a simulation of a prior art three-mode dielectric waveguide filter;

FIG. 4 is a simulation graph of a two-bar coupling window of an embodiment of a monolithic three-mode dielectric filter according to the present invention;

FIG. 5 is a schematic structural diagram of a two-ring coupling window of an embodiment of a monolithic three-mode dielectric filter according to the present invention;

FIG. 6 is a simulation graph of a three-ring coupling window of an embodiment of a monolithic three-mode dielectric filter according to the present invention;

FIG. 7 is a diagram illustrating a structure of a quad L coupling window according to an embodiment of a monolithic three-mode dielectric filter of the present invention;

fig. 8 is a schematic structural diagram of a four -shaped coupling window of a monoblock three-mode dielectric filter according to an embodiment of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: three-mode resonator 1, single-mode resonator 2, coupling window 3, coupling input port 4, coupling output port 5.