CN213782229U

CN213782229U - Negative coupling structure of dielectric filter

Info

Publication number: CN213782229U
Application number: CN202022455488.0U
Authority: CN
Inventors: 李龙章; 任雷斌; 杨佳卓
Original assignee: Tongyu Communication Inc
Current assignee: Tongyu Communication Inc
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-07-23
Anticipated expiration: 2030-10-29

Abstract

The utility model provides a dielectric filter's burden coupling structure, the utility model discloses alternative set up a regulation hole that runs through the dielectric block between two arbitrary resonant cavities, two resonant cavities are linked together through this regulation hole to can make the capacitive coupling structure between the resonant cavity be transformed into the perception, form a burden coupling structure, simultaneously, the utility model discloses be provided with the adjustment tank at the back of filter input port, can further improve dielectric filter's distal end rejection performance through the degree of depth and the width of adjustment tank. Moreover, the utility model discloses simple structure, the suitability is strong, can be applied to all dielectric filter and optimize its distal end performance.

Description

Negative coupling structure of dielectric filter

Technical Field

The utility model belongs to the technical field of dielectric filter coupling structure, concretely relates to dielectric filter's burden coupling structure.

Background

In the 5G era, the requirement of Massive MIMO (Massive antenna technology) on the integration of Massive antennas is limited, and filters need to be more miniaturized and integrated, and under the condition of limiting the size of a cavity, due to the loss of materials, both a metal coaxial cavity filter and a metal cavity dielectric filter cannot obtain a very high Q value, so that various performance indexes of the filters are limited.

The electromagnetic wave resonance in the ceramic dielectric filter occurs in the dielectric material, and the traditional metal cavity is replaced by the metal coating, so the volume is smaller, the weight is lighter, and in addition, the ceramic dielectric filter has the advantages of high Q value, good frequency selection characteristic, good working frequency stability, small insertion loss, small high and low temperature drift characteristics and the like. Therefore, in order to meet the requirement of the 5G base station filter for miniaturization, a ceramic dielectric filter which is more easily miniaturized becomes a mainstream solution.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a negative coupling structure suitable for ceramic dielectric filter, this negative coupling structure can make the capacitive coupling structure between the resonant cavity turn into the perception to improve dielectric filter's outband rejection performance.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a negative coupling structure of a dielectric filter comprises a dielectric block, an ANT port, a TX port and a plurality of resonant cavities, wherein any two resonant cavities can be selectively communicated through an adjusting hole penetrating through the dielectric block, and the far-end inhibition performance of the dielectric filter is adjusted by adjusting the size of the adjusting hole and the distance between the two communicated resonant cavities.

Furthermore, an adjusting groove is formed between the ANT port and the TX port, and the far-end suppression performance of the dielectric filter is improved by adjusting the width and the depth of the adjusting groove.

Furthermore, the ANT port and the TX port are arranged on one end face of the dielectric block together, and the adjusting groove is arranged on the other end face of the dielectric block.

Furthermore, the adjusting groove and the resonant cavities are both of blind groove-shaped structures.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses the alternative set up a regulation hole that runs through the dielectric block between two arbitrary resonant cavities, two resonant cavities are linked together through this regulation hole to can make the capacitive coupling structure between the resonant cavity turn into the perception, form a negative coupling structure, simultaneously, the utility model discloses be provided with the adjustment tank at the back of wave filter input port, can further improve dielectric filter's distal end inhibition performance through the degree of depth and the width of adjustment tank. Moreover, the utility model discloses simple structure, the suitability is strong, can be applied to all dielectric filter and optimize its distal end performance.

Drawings

Fig. 1 is a schematic structural diagram of a negative coupling structure of a dielectric filter according to the present invention;

fig. 2 is a simulation frequency response curve of a dielectric filter adopting the negative coupling structure of the present invention;

the labels in the figure are: 1. ANT port, 2, TX port, 3, adjusting groove, 4, first resonant cavity, 5, second resonant cavity, 6 and adjusting hole.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, a negative coupling structure of a dielectric filter, the dielectric filter includes a dielectric block, an ANT port 1, a TX port 2 and a plurality of resonant cavities, any two of the resonant cavities can be selectively communicated with each other through an adjusting hole 6 penetrating through the dielectric block, so that a capacitive coupling structure between the resonant cavities can be changed into an inductive coupling structure, a negative coupling structure is formed, and the far-end rejection performance of the dielectric filter is adjusted by adjusting the size of the adjusting hole 6 and the distance between two communicated resonant cavities.

In this embodiment, the first resonant cavity 4 and the second resonant cavity 5 are adopted to explain the scheme of the present invention: the first resonant cavity 4 and the second resonant cavity 5 are both of blind groove-shaped structures, the open ends of the first resonant cavity and the second resonant cavity are respectively arranged on two end faces of the dielectric block, the adjusting hole 6 is a through hole penetrating through the dielectric block, and the two resonant cavities are communicated through the adjusting hole 6, so that the capacitive coupling structure between the two resonant cavities is converted into a sensitive structure, and a negative coupling structure is formed.

In order to achieve the best use effect, an adjusting groove 3 is formed between the ANT port 1 and the TX port 2, the adjusting groove 3 is of a blind groove-shaped structure, the ANT port and the TX port are jointly arranged on one end face of the dielectric block, the adjusting groove 3 is arranged on the other end face of the dielectric block, and the far-end suppression performance of the dielectric filter is improved by adjusting the width and the depth of the adjusting groove 3.

To adopting negative coupling structure ' S dielectric filter carry out the simulation experiment, the simulation frequency response curve that obtains after the simulation is shown as figure 2, contains two curve S11 in the picture, S21, wherein, curve S11 is reflection characteristic curve, and curve S21 is transmission characteristic curve, and curve S11 is located curve S21 ' S top, can know by figure 2, adopts negative coupling structure, can produce after pushing away to 5.7G with the secondary oblique peak that should produce about 4.3G originally, obviously, adopt negative coupling structure ' S dielectric filter have good distal end rejection performance. Moreover, the utility model discloses simple structure, the suitability is strong, can be applied to all dielectric filter and optimize its distal end performance.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A negative coupling structure of a dielectric filter, the dielectric filter comprising a dielectric block, an ANT port, a TX port, and a plurality of resonant cavities, characterized in that: any two resonant cavities can be selectively communicated through an adjusting hole penetrating through the dielectric block, and the far-end inhibition performance of the dielectric filter is adjusted by adjusting the size of the adjusting hole and the distance between the two resonant cavities which are communicated.

2. A negative coupling structure of a dielectric filter according to claim 1, wherein: an adjusting groove is formed between the ANT port and the TX port, and the far-end suppression performance of the dielectric filter is improved by adjusting the width and the depth of the adjusting groove.

3. A negative coupling structure of a dielectric filter according to claim 2, wherein: the ANT port and the TX port are arranged on one end face of the dielectric block together, and the adjusting groove is arranged on the other end face of the dielectric block.

4. A negative coupling structure of a dielectric filter according to claim 3, wherein: the adjusting groove and the resonant cavities are both of blind groove-shaped structures.