CN-115954636-B - Filter and coupling polarity adjusting method

CN115954636BCN 115954636 BCN115954636 BCN 115954636BCN-115954636-B

Abstract

The application relates to the technical field of communication, and provides a filter and a coupling polarity adjusting method, wherein the filter comprises a first component, a second component, a first resonator, a second resonator and a coupling piece, and a first resonant cavity and a second resonant cavity are formed between the second component and the first component; the first resonator is positioned in the first resonant cavity, and the second resonator is positioned in the second resonant cavity; one end of the coupling piece is positioned in the first resonant cavity and connected with the first resonator or the first component to form a short-circuit end, the other end of the coupling piece is suspended in the second resonant cavity and positioned at one side of the second resonator to form an open-circuit end, and the coupling piece is used for carrying out capacitive coupling or inductive coupling between the first resonator and the second resonator. According to the filter provided by the application, through arranging the coupling pieces in the same structural form, the capacitive coupling or inductive coupling between the first resonator and the second resonator can be realized only by arranging different lengths, and the structure can be effectively simplified.

Inventors

XIAO JING
ZHONG ZHIBO
WU YAHUI
Hong Zhuangzhuang

Assignees

大富科技(安徽)股份有限公司

Dates

Publication Date: 20260512
Application Date: 20221228

Claims (9)

1.A filter is characterized in that, the filter includes: a first component; the second component is buckled with the first component to form a first resonant cavity and a second resonant cavity which are communicated with each other between the second component and the first component; a first resonator located within the first resonant cavity and disposed on the first component; a second resonator disposed in the second resonant cavity and disposed on the first or second member, and The filter comprises a first resonator, a second resonator, a coupling piece, a first component and a second component, wherein the first resonator is arranged in the first resonator, the second resonator is arranged in the second resonator, the coupling piece is arranged between the first resonator and the second resonator, and the resonant frequency of the coupling piece is in the passband of the filter; The coupling piece comprises a first coupling section and a second coupling section, and one end of the first coupling section is the short-circuit end; the second coupling section is connected with the first coupling section in a bending way, and one end of the second coupling section, which is far away from the first coupling section, is positioned at one side of the second resonator; The first coupling section comprises a plurality of first sub-coupling sections which are connected end to end in sequence, two adjacent first sub-coupling sections are connected in a bending way, at least two adjacent first sub-coupling sections are detachably connected, and/or The second coupling section comprises a plurality of second sub-coupling sections which are sequentially connected end to end, two adjacent second sub-coupling sections are connected in a bending mode, and at least two adjacent second sub-coupling sections are detachably connected.
2. The filter of claim 1, wherein the coupling member has a resonant frequency higher than a center frequency of the filter to capacitively couple the first resonator and the second resonator, or The resonant frequency of the coupling is lower than the center frequency of the filter to inductively couple between the first resonator and the second resonator.
3. The filter of claim 1, wherein the coupling member has a resonant frequency higher than a center frequency of the filter to inductively couple the first resonator and the second resonator, or The resonant frequency of the coupling is lower than the center frequency of the filter to capacitively couple between the first resonator and the second resonator.
4. A filter according to claim 2 or 3, wherein the electrical length of the coupling element is less than one quarter of a wavelength corresponding to the center frequency of the filter, so that the resonant frequency of the coupling element is higher than the center frequency of the filter, or The electrical length of the coupling is greater than one quarter of a wavelength corresponding to the center frequency of the filter such that the resonant frequency of the coupling is lower than the center frequency of the filter.
5. A filter according to any of claims 1 to 3, wherein the shorting end is detachably connected to the first resonator or the first component.
6. The filter according to claim 1, wherein the second coupling section is detachably connected to the first coupling section, and/or One end of the second coupling section far away from the first coupling section is the open end.
7. The filter of claim 1, wherein the coupling further comprises a third coupling segment, the third coupling segment being in kink connection with the second coupling segment, and wherein an end of the third coupling segment remote from the second coupling segment is the open end.
8. A coupling polarity adjustment method, suitable for use in the filter of any one of claims 1 to 7, comprising: The length of the coupling is adjusted so that the first resonator and the second resonator are changed from capacitive coupling to inductive coupling or from inductive coupling to capacitive coupling.
9. The coupling polarity adjustment method of claim 8, wherein the adjusting the length of the coupling member comprises: If the electrical length of the coupling is less than one quarter of the wavelength corresponding to the center frequency of the filter, then adjusting the electrical length of the coupling to be greater than one quarter of the wavelength corresponding to the center frequency of the filter, or And if the electrical length of the coupling piece is larger than one quarter of the wavelength corresponding to the center frequency of the filter, adjusting the electrical length of the coupling piece to be smaller than one quarter of the wavelength corresponding to the center frequency of the filter.

Description

Filter and coupling polarity adjusting method Technical Field The application relates to the technical field of communication, in particular to a filter and a coupling polarity adjusting method. Background The adjacent two resonators of the filter generally need to be capacitively coupled or inductively coupled, when the capacitive coupling is needed, a fly rod is usually arranged between the two resonators, and when the inductive coupling is needed, a coupling window or a connecting rib is usually arranged between the two resonators. Therefore, in order to realize capacitive coupling or inductive coupling, different structural forms need to be arranged between the two resonators, which results in a complex structure and influences the performance of the filter. Disclosure of Invention The embodiment of the application provides a filter and a coupling polarity adjusting method, which can solve the technical problem that different structural forms are required to be arranged between two resonators to realize capacitive coupling or inductive coupling. In a first aspect, an embodiment of the present application provides a filter, including: a first component; The second component is buckled with the first component to form a first resonant cavity and a second resonant cavity which are communicated with each other between the second component and the first component; a first resonator located within the first resonant cavity and disposed on the first component; a second resonator disposed in the second resonant cavity and disposed on the first or second member, and The coupling piece is positioned between the first resonator and the second resonator, one end of the coupling piece is positioned in the first resonant cavity and connected with the first resonator or the first component to form a short-circuit end, the other end of the coupling piece is suspended in the second resonant cavity and positioned at one side of the second resonator to form an open-circuit end, and the coupling piece is used for performing capacitive coupling or inductive coupling between the first resonator and the second resonator. The technical scheme provided by the embodiment of the application has at least the following technical effects or advantages: According to the filter provided by the embodiment of the application, the coupling piece is arranged between the first resonator and the second resonator, one end of the coupling piece is positioned in the first resonant cavity and connected with the first resonator or the first component to form the short-circuit end, the other end of the coupling piece is suspended in the second resonant cavity and positioned at one side of the second resonator to form the open-circuit end, and the coupling piece can form the signal transmission structure with one end short-circuited and the other end open-circuited, so that the signal transmission structure has the characteristic of presenting different properties (capacitive or inductive) under different lengths, and can enable the first resonator and the second resonator to be subjected to capacitive coupling or inductive coupling. Therefore, through setting up the coupling piece of same structural style, only need set up different length, can realize the capacitive coupling or the inductive coupling between first resonator and the second resonator, need not to set up different structural style and realize capacitive coupling and inductive coupling respectively, can effectively simplify the structure, reduction in production cost to can reduce the possibility that influences the filter performance because of the setting up of structural style such as flybar and connecting rib. In some embodiments, the resonant frequency of the coupling is higher than the center frequency of the filter to capacitively couple between the first resonator and the second resonator, or The resonant frequency of the coupling is lower than the center frequency of the filter to inductively couple between the first resonator and the second resonator. In some embodiments, the resonant frequency of the coupling is higher than the center frequency of the filter to inductively couple between the first resonator and the second resonator, or The resonant frequency of the coupling is lower than the center frequency of the filter to capacitively couple between the first resonator and the second resonator. In some embodiments, the electrical length of the coupling is less than one quarter of a wavelength corresponding to the center frequency of the filter, such that the resonant frequency of the coupling is higher than the center frequency of the filter, or The electrical length of the coupling is greater than one quarter of a wavelength corresponding to the center frequency of the filter such that the resonant frequency of the coupling is lower than the center frequency of the filter. In some embodiments, the shorting end is removably connected to the first resonator or the first