阅读说明：本技术 一种用于多模介质滤波器的可调耦合结构 (Adjustable coupling structure for multi-mode dielectric filter ) 是由 蔡磊 于 2020-12-30 设计创作，主要内容包括：本发明涉及滤波器的技术领域,尤其是涉及一种用于多模介质滤波器的可调耦合结构,其包括两个基本谐振器,两个所述基本谐振器中至少有一个谐振器是多模谐振器,两个所述基本谐振器之间设有失谐谐振器,所述失谐谐振器与两个所述基本谐振器固定连接。本发明具有可以大大的改善多模滤波器的使用场景,制造指标要求更高的产品的效果。(The invention relates to the technical field of filters, in particular to an adjustable coupling structure for a multimode dielectric filter, which comprises two basic resonators, wherein at least one of the two basic resonators is a multimode resonator, a detuning resonator is arranged between the two basic resonators, and the detuning resonator is fixedly connected with the two basic resonators. The invention has the effects of greatly improving the use scene of the multimode filter and manufacturing products with higher index requirements.)

1. A tunable coupling structure for a multimode dielectric filter, comprising two elementary resonators (1), at least one of the two elementary resonators (1) being a multimode resonator, characterized in that: a detuning resonator (2) is arranged between the two basic resonators (1), and the detuning resonator (2) is fixedly connected with the two basic resonators (1);

wherein the deviation between the working frequency of the detuning resonator (2) and the working frequency of the basic resonator (1) is between 5% and 25%.

2. The tunable coupling structure for a multimode dielectric filter according to claim 1, wherein: both of the basic resonators (1) are multimode resonators.

3. The tunable coupling structure for a multimode dielectric filter according to claim 1, wherein: one of the two basic resonators (1) is a multimode resonator and the other is a single-mode resonator.

4. The tunable coupling structure for a multimode dielectric filter according to claim 1, wherein: the detuning resonator (2) is a cavity resonator.

5. The tunable coupling structure for a multimode dielectric filter according to claim 1, wherein: the detuning resonator (2) is made of a material with the same or different dielectric constant with the multimode resonator.

6. The tunable coupling structure for a multimode dielectric filter according to claim 1, wherein: the detuning resonator (2) adopts a ceramic resonator or a metal resonator or a quartz crystal resonator.

7. The tunable coupling structure for a multimode dielectric filter according to claim 1, wherein: the detuned resonator (2) is a quasi-TEM detuned resonator (2).

8. The tunable coupling structure for a multimode dielectric filter according to claim 1, wherein: the multimode resonator is a dual-mode or three-mode dielectric waveguide resonator.

Technical Field

The invention relates to the technical field of filters, in particular to an adjustable coupling structure for a multimode dielectric filter.

Background

Compared with a single-mode filter, the medium multi-mode filter has a much better damage index, but the coupling between medium multi-modes is often not adjustable, and the processing precision of an actual product cannot meet the design requirement, so that the medium multi-mode filter is not used in mass production.

The common mode dielectric waveguide filter is realized by directly growing two multimode resonators together or assembling the multimode resonator and the single mode resonator together, and coupling is realized by opening a coupling window between the multimode resonator and the single mode resonator.

However, in some cases, the coupling window between the resonators cannot be tuned by the outside due to the multi-mode structure, such as 2 three-mode dielectric resonators. The surface of the resonator is plated with silver. 2 three-mode resonators are connected together in a welding mode, a window is formed in silver layers of welding surfaces of the two resonators, and energy interaction between the two resonators is achieved through the window.

As shown in fig. 1, since the window is positioned at the bonding surface of the two resonators, the amount of coupling cannot be tuned by the size of the window.

The coupling quantity of the actually produced product is difficult to control due to the influences of the processing precision of the window, the thickness of the welding material on the welding surface and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an adjustable coupling structure for a multimode dielectric filter, which has the effects of greatly improving the use scene of the multimode filter and manufacturing products with higher index requirements.

The above object of the present invention is achieved by the following technical solutions:

a tunable coupling structure for a multimode dielectric filter comprises two basic resonators, at least one of the two basic resonators is a multimode resonator, a detuned resonator is arranged between the two basic resonators, and the detuned resonator is fixedly connected with the two basic resonators;

wherein the deviation between the working frequency of the detuned resonator and the working frequency of the basic resonator is between 5% and 25%.

By adopting the technical scheme, the detuning resonator does not participate in frequency oscillation, and the frequency of the detuning resonator is adjusted by polishing the silver layer on the surface of the detuning resonator, which is equivalent to adjusting the coupling between two basic resonators; in addition, the higher-order mode of the detuned resonator can be adjusted by changing the material, the shape and the oscillation mode of the detuned resonator, so that an additional parasitic mode inhibiting function can be provided for the dielectric waveguide filter, and the out-of-band inhibiting performance of the filter is improved; and the non-linearity of the frequency of the detuned resonator from the admittance slope of the resonator acts as a coupling, i.e. the coupling varies with frequency, providing an extra zero, thereby further improving the performance of the filter.

The present invention in a preferred example may be further configured to: both of the basic resonators are multimode resonators.

The present invention in a preferred example may be further configured to: one of the two basic resonators is a multi-mode resonator and the other is a single-mode resonator.

The present invention in a preferred example may be further configured to: the detuned resonator is a cavity resonator.

The present invention in a preferred example may be further configured to: the detuning resonator adopts the material with the same or different dielectric constant with the multimode resonator.

The present invention in a preferred example may be further configured to: the detuning resonator adopts a ceramic resonator or a metal resonator or a quartz crystal resonator.

The present invention in a preferred example may be further configured to: the detuned resonator is a quasi-TEM detuned resonator.

The present invention in a preferred example may be further configured to: the multimode resonator is a dual-mode or three-mode dielectric waveguide resonator.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the coupling tuning problem of the multimode waveguide filter is effectively solved, and the coupling tuning device is very suitable for being used as a coupling device between dielectric waveguide blocks of a dual mode, a three mode and the like, and has good coupling tuning quantity. The problem of coupling processing precision which puzzles the mass production of the multi-mode dielectric waveguide filter is solved;

2. the detuning resonator is used as a coupling unit, and the parasitic coupling of the dielectric waveguide can be improved;

3. the detuning resonator is used as a coupling unit, an extra zero point can be formed, and the performance of the product is further improved.

Drawings

FIG. 1 is a schematic diagram of a background art configuration;

FIG. 2 is a schematic diagram of the connection of a fundamental resonator to a detuned resonator in an embodiment;

FIG. 3 is a schematic diagram showing a window in the connection of a fundamental resonator with a detuned resonator in an embodiment;

figure 4 is a schematic diagram of an embodiment in which the detuned resonator is a quasi-TEM resonator.

In the figure, 1, a basic resonator; 2. a detuned resonator; 3. a window; 4. a three-mode resonator.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b):

referring to fig. 2 to 4, the tunable coupling structure for a multi-mode dielectric filter disclosed in the present invention includes two basic resonators 1 and a detuned resonator 2 disposed between the two basic resonators 1.

Wherein the positive and negative deviation of the working frequency of the detuning resonator 2 and the working frequency of the basic resonator 1 is between 5 percent and 25 percent.

The two basic resonators 1 and the detuned resonator 2 may be fixedly connected by welding or may be connected by crimping.

The detuning resonator 2 does not participate in frequency oscillation, and the frequency of the detuning resonator 2 is adjusted by polishing a silver layer on the surface of the detuning resonator 2, which is equivalent to adjusting the coupling between the two basic resonators 1; in addition, the higher-order mode of the detuned resonator 2 can be adjusted by changing the material, the shape and the oscillation mode of the detuned resonator 2, so that an additional parasitic mode inhibiting function can be provided for the dielectric waveguide filter, and the out-of-band inhibiting performance of the filter is improved; and the non-linearity of the frequency of the detuned resonator 2 from the admittance slope of the resonator acts as a coupling, i.e. the coupling varies with frequency, providing an extra zero, thereby further improving the performance of the filter.

One of the two basic resonators 1 may be a multimode resonator and the other a single-mode resonator; it is also possible that both basic resonators 1 are multimode resonators.

The detuning resonator 2 can be made of the same material or different materials with the dielectric constant of the multimode resonator, or can be a cavity resonator, and a dielectric waveguide resonator with higher dielectric constant is adopted as the detuning resonator 2, so that the size of the detuning resonator 2 can be effectively reduced. If a medium with a lower dielectric constant is adopted, a detuning resonance point is generated at a position higher than the resonance frequency, and the proper detuning frequency is selected, so that the higher-order mode of the filter can be effectively inhibited.

With a detuned resonator 2 in the quasi-TEM mode, the performance can be further improved.

The detuning resonator 2 can be realized in various forms, a ceramic resonator or a metal resonator or a quartz crystal resonator can be adopted, and the detuning resonator 2 is reasonably designed to realize coupling and greatly improve the product performance.

The multimode resonator of the two basic resonators 1 is a two-mode or three-mode dielectric waveguide resonator.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.