Filter

Abstract

The invention discloses a filter which comprises a filter frame and at least two resonators. Two adjacent resonators are coupled. Each resonator comprises a main body part and a bent part. One end ofthe main body part and the filter frame are integrally formed and grounded, and the bent part is formed by bending the other end of the main body part. Through the specific structure of the resonators, the size of the filter is smaller, meanwhile, the cross coupling mode of the filter is simpler, and the filter is more beneficial to the overall performance of a product.

Description

technical field [0001] The invention relates to a filter, in particular to a filter with a smaller size. Background technique [0002] With the rapid development of communication technology, the volume requirements of filters are becoming more and more stringent. It is often necessary to design resonators and suppress zero points in a limited tiny space to meet the requirements of in-band and out-of-band insertion loss suppression, and several traditional filters have been difficult to meet the design requirements in such a small volume. [0003] For example, the patent application number: CN201710149229.5 discloses a filter with a frame structure. In this solution, the two sides of the square-shaped frame are open structures, and the partition wall divides the inside of the frame into two spaces. Perpendicular to this partition wall, there is an integral resonator. The resonator is bent into an L-shape or a T-shape to reduce space requirements, but this form still has lim...

AI Technical Summary

Problems solved by technology

This type of structure will generate processing costs and processing tolerances, and the cross-coupling strength becomes very sensitive due to factors such as position tolerances and spacing when the resonator is directly soldered or fixed with other forms of sheet conductors

Therefore, the complexity of the process and the increase in sensitivity lead to an increase in production costs and a decrease in production capacity.

[0006] In addition, because the transmission coupling between resonators must be ensured, the arrangement direction of the resonators is limited. Generally, the signal transmission path can only be a straight line or a U shape, so the position of the input and output ports cannot be changed, resulting in the inability to meet various requirements. system requirements, and additional structural parts are required to change the port position

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