Cavity filter with adjustable capacitive coupling structure

A cavity filter, capacitive coupling technology, applied in waveguide-type devices, circuits, resonators, etc., can solve the problems of small adjustment range, multiple opening and adjustment, time-consuming and labor-intensive, etc., to avoid wear and tear, reduce debugging difficulty, The effect of improving insertion loss performance and reliability
CN1776958AActive Publication Date: 2006-05-24SUNWAVE COMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUNWAVE COMM
Publication Date
2006-05-24

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Abstract

The filter includes case body. Resonant cavity is built inside the case body. A slotopening is made on the dividing wall between not adjacent concentric resonators needed capacitance to be coupled. A tunable capacitance coupling module is setup in the slotopening. The module includes medium screw, metal piece. Through subassembly of nut and gasket unit, the upper end of the medium screw is fixed on the cover board; and the lower end of the medium screw is on the slotopening. A sheet metal is fixed on lower end of the medium screw. Being extended out of the dividing wall, the sheet metal is folded down. Useful effects of the invention are: (1) since the structure is movable up and down, thus, range of tunable capacitance coupling strength of not adjacent cavities is increased; (2) lowering tuning difficulties and shortening tuning time; (3) avoiding abrasion of screw between cover board and cavity caused by opening cover board for many times; (4) raising performance of insertion loss.
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Description

technical field

[0001] The invention relates to a radio frequency and cavity filter in the field of wireless communication, in particular to a cavity filter with an adjustable capacitive coupling structure which can conveniently adjust the capacitive coupling strength of non-adjacent cavities in a large range. Background technique

[0002] In mobile communication cavity filters, non-adjacent cavity capacitive coupling design is a common method. It can effectively improve the selectivity outside the filter band. There are many non-adjacent cavity capacitive coupling structures. But it is very difficult to adjust the strength of most capacitive couplings. Common adjustment methods are: 1. Open the filter cover to adjust, which is time-consuming and labor-intensive. 2. Each capacitive coupling corresponds to opening two holes on the cover plate for adjustment. After adjustment, stick a metal tape adhesive patch, but the adjustment range is small. Contents of the invention ...

Claims

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