Duplexer, dielectric filter and capacitive coupling structure thereof

Abstract

The invention discloses a duplexer, a dielectric filter and a capacitive coupling structure thereof. The capacitive coupling structure comprises a first adjustment slot which is arranged between two adjacent dielectric resonators in a dielectric body and arranged according to first preset length and preset depth. One end of the first adjustment slot is spaced apart from a sidewall of the dielectric body, and the other end of the first adjustment slot is in communication with another sidewall of the dielectric body or the other end of the first adjustment slot is in communication with an isolation window. The capacitive coupling structure is easy to produce and is convenient for subsequent production debugging. The dielectric filter adopting the capacitive coupling structure has low production difficulty and low difficulty in production debugging. The duplexer adopting the dielectric filter has low production difficulty and low difficulty in production debugging.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a duplexer, a dielectric filter and a capacitive coupling structure thereof. Background technique [0002] With the rapid development of communication technology, in order to meet the needs of use, communication devices are increasingly miniaturized. Dielectric filters are widely used in communication equipment because of their miniaturization. [0003] In order to achieve good loss and suppression effects, the dielectric filter usually achieves better performance and smaller volume by increasing cross-coupling, so it is necessary to set a capacitive coupling structure on the dielectric filter. In order to achieve the purpose of capacitive coupling in the dielectric filter, the traditional method is to set a deep hole between two adjacent dielectric resonators in the dielectric body, and adjust the distance between the bottom wall of the deep hole and the lower surface of the di...

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Problems solved by technology

In order to achieve the purpose of capacitive coupling in the dielectric filter, the traditional method is to set a deep hole between two adjacent dielectric resonators in the dielectric body, and adjust the distance between the bottom wall of the deep hole and the lower surface of the dielectric body To adjust the capacitive coupling bandwidth, wherein the smaller the distance between the bottom wall of the deep hole and the lower surface of the dielectric body, the smaller the capacitive coupling bandwidth. In order to achieve a small capacitive coupling bandwidth, the bottom wall of the deep hole and the medium The distance between the lower surfaces of the main body needs to be small enough. In the sintering process of the production process, it is not conducive to sintering and molding, which increases the difficulty of production and is not conducive to subsequent production and debugging.

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