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Dual-mode and dual-frequency coaxial cavity filter

A coaxial cavity and filter technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problem of system volume increase, and achieve the effect of simple and compact structure, good out-of-band frequency selection characteristics, and easy processing

Pending Publication Date: 2019-11-08
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

If the filter is designed separately for each frequency band, it will inevitably lead to a larger system size

Method used

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  • Dual-mode and dual-frequency coaxial cavity filter
  • Dual-mode and dual-frequency coaxial cavity filter
  • Dual-mode and dual-frequency coaxial cavity filter

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with specific examples.

[0019] Such as figure 1 and figure 2 As shown, the coaxial cavity dual-band filter provided in this embodiment includes a closed metal cavity 13 and two input and output ports 1, 12; the metal cavity 1 is a rectangular metal cavity, and its internal structure is The linear distribution is the first coaxial resonant cavity, the first coupling resonant window, the second coaxial resonant cavity, the second coupling resonant window, and the third coaxial resonant cavity; the first coaxial resonant cavity, the second The first two resonant frequencies of the coaxial resonant cavity and the third coaxial resonant cavity are the same, and the high-order resonant frequencies are far apart, so that a dual-frequency filter with a wider stop band and better performance can be obtained; the first coupling resonant The positions and parameters of the two parts of the window and the sec...

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Abstract

The invention discloses a dual-mode dual-frequency coaxial cavity filter. The dual-mode and dual-frequency coaxial cavity filter comprises a metal cavity and input / output ports; the structure in the metal cavity is linearly distributed and comprises a first coaxial resonant cavity, a first coupled resonant window, a second coaxial resonant cavity, a second coupled resonant window and a third coaxial resonant cavity. The first, second and third coaxial resonant cavities are respectively internally provided with vertical metal cylinders and horizontal metal cylinders, the first and second coupled resonant windows are both formed by coupling structures and coupling windows, and there are the two input / output ports which are both coaxial feed lines and are respectively extended and inserted into the vertical metal cylinders of the first and third resonant cavities. On the basis of the traditional conventional coaxial filter, the two metal cylinders can respectively control the first resonant frequency and the second resonant frequency of the resonant cavities by adding the metal cylinders in the horizontal direction to achieve dual frequency characteristics, and the dual-mode dual-frequency coaxial cavity filter is simple and compact in structure, miniaturized, easy to tune, wide in bandwidth and good in selectivity.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to a dual-mode, dual-frequency coaxial cavity filter. Background technique [0002] With the rapid development of wireless communication technology and the continuous growth of radio media services, low-cost, more effective, and higher-quality wireless communication systems require high-performance, small-volume, and low-loss cavity filters. Compared with other types of microwave filters, the cavity filter has a solid structure, stable and reliable performance, smaller volume, moderate Q value, far high-end parasitic passband and good heat dissipation. Therefore, cavity filters are widely used in major communication base stations. [0003] In recent years, scholars' research on cavity filters is not limited to single-band high performance, but is developing in the direction of multi-band high performance. Indeed, with the development of wireless communication servi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/202H01P1/205H01P1/207
CPCH01P1/202H01P1/207H01P1/2053
Inventor 谢雅陈付昌
Owner SOUTH CHINA UNIV OF TECH
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