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Mixed coupling coaxial cavity filter capable of controlling electromagnetism

An electromagnetic mixing and coupling coaxial technology, which is applied in the direction of waveguide devices, circuits, resonators, etc., can solve the problems that the main coupling filter cannot realize the elliptic function filtering characteristics, and the volume of the cross-coupling filter is large, so as to achieve flexible transmission zero point Settings, superior performance, reduced number of effects

Inactive Publication Date: 2008-10-01
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing main coupling filter cannot realize the filtering characteristics of the elliptic function, and overcome the problem that the volume of the existing cross-coupling filter is still relatively large, A coaxial cavity filter with a controllable electromagnetic hybrid coupling structure and a duplexer composed of the controllable electromagnetic hybrid coupling filter are provided, and the filter with only the main coupling setting is used to realize the elliptic function filtering characteristics

Method used

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  • Mixed coupling coaxial cavity filter capable of controlling electromagnetism
  • Mixed coupling coaxial cavity filter capable of controlling electromagnetism
  • Mixed coupling coaxial cavity filter capable of controlling electromagnetism

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0027] The structure of the controllable electromagnetic hybrid coupling coaxial cavity filter proposed by the present invention is as follows: figure 1 As shown, there are two or more resonant cavities 2 in the conductor shell 1, the top of the conductor shell 1 is closed by the conductor cover 3, and the place around the conductor cover 3 in contact with the conductor shell 1 is provided with evenly distributed metal screws For fixing, the conductor cover plate 3 can be disassembled so as to arrange the components in the resonant cavity 2 . The top of the conductor resonator 4 is provided with a circular or flat top of any other shape, so that the length required for the conductor resonator 4 to work is shorter than that of a common conductor resonator, and the length of the conductor resonator 4 is less than the available 1 / 4 of the operat...

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Abstract

The invention discloses a controllable electromagnetic mixed coupling coaxial cavity filter, comprising a conductor housing with two or more resonant cavities opened inside, the top of which is sealed by a conductor cover board and which is provided with a through hole; an input / output device penetrates through the through hole on the conductor hosing; bottoms of two or more conductor resonators are fixed to the conductor housing in contact with the guide housing to form short circuit; the conductor cover board opposite to the tope of the conductor resonator is provided with a tuning screw; an electromagnetic mixed coupling control component is arranged between two adjacent guide resonators which need electromagnetic mixed coupling. The invention accomplishes elliptic filter characteristic with a coaxial cavity filter only with main coupling path, which is provided with the following advantage of small volume, low cost, little insertion loss and nonsymmetrical response.

Description

technical field [0001] The invention relates to the technical field of microwave filters, in particular to a coaxial cavity filter with a controllable electromagnetic hybrid coupling structure. Background technique [0002] Coaxial cavity filters are widely used in wireless communication base stations. Under the existing technical conditions, cavity filters with only the main coupling path can only achieve the ordinary Chebyshev function filter response and cannot realize the ellipse with transmission zero. The function filters the response. At present, almost all elliptic function filtering characteristics are realized by cross-coupling filters, but traditional cross-coupling filters have the disadvantages of high order, large size, and high design difficulty. [0003] In existing cavity filters, there is only a single controllable electrical coupling or magnetic coupling between all adjacent or non-adjacent resonant units, and there is no controllable electromagnetic hybr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/202H01P7/06
Inventor 褚庆昕王欢
Owner SOUTH CHINA UNIV OF TECH
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