阅读说明：本技术 一种容性耦合结构及滤波器 (Capacitive coupling structure and filter ) 是由 何进军 韦俊杰 陈鹏 于 2020-06-30 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,具体为一种容性耦合结构及滤波器,一种容性耦合结构,包括与多个相邻且不连接的谐振器相连的中间部,中间部包括用于连接谐振器的连接块,以及用于隔离谐振器的隔离腔,与同一中间部连接的两谐振器的电场方向不同。一种滤波器,包括多个谐振器,多个谐振器之间至少使用一个上述容性耦合结构,所述容性耦合结构使得其连接的谐振器间产生容性负耦合。采用本方案的容性耦合结构及滤波器能够解决现有技术中采用深加载的频率调试盲孔实现容性负耦合导致谐振极点产生的技术问题,通过容性耦合结构实现容性负耦合,消除低频率的谐振极点,避免带外抑制幅度过高。(The invention relates to the technical field of communication equipment components, in particular to a capacitive coupling structure and a filter. A filter comprises a plurality of resonators, at least one capacitive coupling structure is used among the resonators, and the capacitive coupling structure enables capacitive negative coupling to be generated among the connected resonators. The capacitive coupling structure and the filter of this scheme of adoption can solve and adopt the technical problem that the capacitive negative coupling of deep loading frequency debugging blind hole realization leads to the resonance limit to produce among the prior art, realize the capacitive negative coupling through capacitive coupling structure, eliminate the resonance limit of low frequency, avoid the outband to restrain the range too high.)

1. A capacitive coupling structure, characterized by: the resonator comprises an intermediate part connected with a plurality of adjacent and unconnected resonators, wherein the intermediate part comprises a connecting block used for connecting the resonators and an isolating cavity used for isolating the resonators, and the directions of electric fields of the two resonators connected with the same intermediate part are different.

2. A capacitive coupling structure according to claim 1, wherein: the connecting block comprises a coupling window connected with the resonator and an isolation side connected with the isolation cavity, wherein the isolation side is covered with a conductive shielding layer.

3. A capacitive coupling structure according to claim 2, wherein: the connecting block is a component made of microwave dielectric materials.

4. A capacitive coupling structure according to claim 2, wherein: the conductive shielding layer is a metal conductive shielding layer.

5. A filter comprising a plurality of resonators, characterized in that: use of at least one capacitive coupling structure according to any of claims 1-4 between a plurality of resonators.

6. A filter according to claim 5, characterized in that: the capacitive coupling structure enables capacitive negative coupling between the resonators connected with the capacitive coupling structure.

7. A filter according to claim 5, characterized in that: the resonator further comprises an input electrode structure and an output electrode structure, wherein the input electrode structure and the output electrode structure are respectively arranged on the two resonators.

8. A filter according to claim 5, characterized in that: the device also comprises at least two debugging blind holes for adjusting the resonant frequency of the resonators, wherein the debugging blind holes are respectively positioned on different resonators.

9. A filter according to claim 5, characterized in that: a plurality of filters are each coated with a conductive shielding layer.

10. A filter according to claim 9, wherein: the conductive shielding layer is a metal conductive shielding layer.

Technical Field

The invention relates to the technical field of communication equipment components, in particular to a capacitive coupling structure and a filter.

Background

With the continuous development of the wireless base station communication technology, new requirements are put on the comprehensive performance and the volume of the filter, and the dielectric waveguide filter shows sufficient advantages in the comprehensive performance and the volume. With the development of multi-frequency systems, the requirements on the frequency selective characteristic and the out-of-band rejection characteristic of the filter are higher and higher, and the introduction of capacitive coupling is one of the methods for improving the frequency selective characteristic and the out-of-band rejection characteristic of the filter.

At present, a capacitive negative coupling mode is usually realized in a dielectric waveguide filter by arranging a deep blind hole negative coupling structure and loading coupling frequency through the deep blind hole negative coupling structure, so that the capacitive negative coupling is realized. For example, in a conventional dielectric waveguide filter, a dielectric body includes two resonators, a capacitive negative coupling hole is formed in the dielectric body between the two resonators, and a depth of the capacitive negative coupling hole is at least greater than half of a thickness of the dielectric body. The transmission path of the two resonators is changed by compressing the electric fields of the two resonators and is very close to the bottom surfaces of the resonators, so that negative coupling of a capacitance effect is formed. However, the essence of the dielectric waveguide filter is to provide a deep-loaded frequency tuning blind hole, which inevitably generates a resonance pole at the low end of the pass band of the dielectric waveguide filter, and on the premise of determining the zero position of the dielectric waveguide filter, the position of the resonance pole generally cannot be adjusted at will, so that the out-of-band rejection amplitude is too high, and the high rejection requirement of the wireless communication system is difficult to meet.

Disclosure of Invention

The invention aims to provide a capacitive coupling structure and a filter, and aims to solve the technical problem that in the prior art, a resonant pole is generated due to the fact that capacitive negative coupling is achieved by adopting a deep-loaded frequency debugging blind hole.

One of the basic schemes provided by the invention is as follows: a capacitive coupling structure comprises an intermediate part connected with a plurality of adjacent and unconnected resonators, wherein the intermediate part comprises a connecting block used for connecting the resonators and an isolating cavity used for isolating the resonators, and the electric field directions of the two resonators connected with the same intermediate part are different.

The basic scheme has the beneficial effects that: the arrangement of the middle part realizes the connection and the coupling of the two resonators, and a transmission path is constructed. The isolation part is arranged to separate the strong electromagnetic fields of the two resonators, and only the weak parts of the electromagnetic fields are kept to be connected with each other; because the middle electromagnetic field intensity and the edge electromagnetic field are weak, the coupling between the resonators can be very weak due to the integrated structure, and the coupling bandwidth is greatly reduced. The two resonators are connected through the middle part, the electric field directions of the two resonators connected with the same middle part are different, and capacitive cross coupling is formed through conversion among different resonance modes due to the difference of the electric field directions, so that the polarity of a transmission path of the filter is changed. According to the scheme, capacitive negative coupling is realized through the capacitive coupling structure, and a deep-loading frequency debugging blind hole is not required to be arranged, so that the problem that a resonance pole is generated at the lower end position of a pass band due to the fact that the capacitive negative coupling is realized through the deep-loading frequency debugging blind hole is solved.

Further, the connection block comprises a coupling window connected with the resonator and an isolation side connected with the isolation cavity, and the isolation side is covered with a conductive shielding layer. Has the advantages that: the conductive shielding layer can shield interference of external electromagnetic energy, and coupling of the resonator and the middle block is realized through the coupling window, so that crosstalk between the resonators is eliminated, and the suppression capability of far-end harmonic waves is improved.

Further, the connecting block is a component made of microwave dielectric materials. Has the advantages that: the microwave dielectric material has small volume, low microwave loss, small frequency temperature coefficient and high dielectric constant.

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.

The second basic scheme provided by the invention is as follows: a filter comprises a plurality of resonators, and at least one capacitive coupling structure is used among the resonators.

The basic scheme has the beneficial effects that: by using the capacitive coupling structure, capacitive negative coupling is realized, and a deep-loading frequency debugging blind hole is not required to be arranged, so that a low-frequency resonance pole generated by realizing the capacitive negative coupling by adopting the deep-loading frequency debugging blind hole is eliminated. Meanwhile, the structure is simple, and the capacitive coupling structure is convenient to install and debug.

Further, the capacitive coupling structure enables capacitive negative coupling to be generated between the connected resonators. Has the advantages that: the low-frequency resonance pole is eliminated through the capacitive coupling structure, and the out-of-band rejection amplitude is prevented from being too high, so that the high rejection requirement of a wireless communication system is met.

And the input electrode structure and the output electrode structure are respectively arranged on the two resonators. Has the advantages that: the input electrode structure provides a port for input harmonics and the output electrode structure provides a port for output harmonics.

Furthermore, the device also comprises at least two debugging blind holes for adjusting the resonant frequency of the resonators, wherein the debugging blind holes are respectively positioned on different resonators. Has the advantages that: the resonant frequency of the resonator corresponding to the debugging blind hole is adjusted by adjusting the depth and the size of the debugging blind hole.

Further, a plurality of filters are all covered with a conductive shielding layer. Has the advantages that: the conductive shielding layer can shield the interference of external electromagnetic energy.

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.

Drawings

FIG. 1 is a schematic structural diagram of a capacitive coupling structure according to a first embodiment of the present invention;

FIG. 2 is a graph showing the variation of the coupling degree with the width of the coupling window according to the first embodiment of the capacitive coupling structure of the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of a filter according to the present invention;

FIG. 4 is a bottom view of a second embodiment of a filter according to the present invention;

FIG. 5 is a schematic structural diagram of a deep-loading frequency tuning blind via according to a second embodiment of the filter of the present invention;

FIG. 6 is a graph of the frequency response of the filter of FIG. 4 in accordance with one embodiment of the present invention;

FIG. 7 is a graph of the frequency response of the filter of FIG. 2 in accordance with one embodiment of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments: