Short millimeter wave stacked type cylindrical cavity filter for restraining parasitic mode

A technology of wave stacking and parasitic mode, which is applied in waveguide devices, electrical components, circuits, etc., can solve the problems of destroying the performance of the stop band and the parasitic mode can not meet the requirements of high-performance filtering, so as to improve the performance of the stop band and high performance Filtering, the effect of improving the optimization rate

Inactive Publication Date: 2015-06-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The frequency spacing of the cylindrical waveguide mode is much closer, and the spurious modes adjacent to the frequency of the main resonant mode will seriously damage the stopband performance. A simple design that does not solve the problem of spurious modes adjacent to the frequency of the cylindrical cavity cannot meet the requirements of high-performance filtering

Method used

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  • Short millimeter wave stacked type cylindrical cavity filter for restraining parasitic mode
  • Short millimeter wave stacked type cylindrical cavity filter for restraining parasitic mode
  • Short millimeter wave stacked type cylindrical cavity filter for restraining parasitic mode

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Embodiment

[0025] In order to verify the present invention, a third-order Chebyshev filter has been designed in the present embodiment, and a center frequency of 170 GHz, a relative bandwidth of 3.5%, and a high-performance band-pass filter sample with an average insertion loss of 0.7 dB in the pass band have been realized with a numerically controlled milling machine. .

[0026] The schematic diagram of the filter structure is as figure 1 As shown in , the position offset of the cylindrical cavity forms a coupling window to realize the electromagnetic energy coupling between the cavities. Its three views and size parameters are as follows figure 2 , image 3 and Figure 4 As shown; the cylindrical resonant cavity is connected to the input and output rectangular waveguides through the waveguide flange, and the alignment pins are used between the cylindrical resonant cavities to realize the precise cooperation between the cavities of each layer and with the input and output rectangular...

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Abstract

The invention discloses a short millimeter wave stacked type cylindrical cavity filter for restraining a parasitic mode, and belongs to the technical field of thz devices. The short millimeter wave stacked type cylindrical cavity filter adopts a layered structure to realize stacking a plurality of cylindrical resonant cavities; the size of a coupling window is controlled by controlling the location offset of cylindrical cavities, and the coupling electromagnetic energy size is controlled, so that a coupling coefficient and an external quality factor are controlled; the diameters and the heights (namely the thickness of the layer) of the cylindrical cavities are controlled to control the resonant frequency, wherein a resonant mode is selected as a TE111 mode. The parasitic mode close to the symmetrical restraining frequency with respect to the centre H surface is utilized to improve the stop band frequency, and the optimizing rate is increased by multiple times. Relative to the high requirements of a rectangular waveguide cavity with millimeter and sub-millimeter dimension, the stacked type cylindrical cavity greatly reduces the difficulties of precise mechanical processing process; under the same processing precision condition, the filter frequency realized by the structure is higher than that of the rectangular cavity filter.

Description

technical field [0001] The invention relates to a basic functional passive component in the terahertz band, in particular to a short millimeter wave stacked cylindrical cavity filter for suppressing parasitic modes. Background technique [0002] The frequency of terahertz wave (100GHz~10THz) is between microwave and infrared. It is a band that is relatively little understood by humans. Therefore, it is also called "Terahertz Gap" and is one of the frontier fields of research. Short millimeter wave (100GHz~1THz) spans the high-frequency end of microwave and the low-frequency end of terahertz wave, and has extensive and important applications in ultrafast wireless communication, radar, atmospheric monitoring, security inspection, medical imaging, etc. Research hotspots. [0003] Low-loss, low-cost and miniaturized components are the basis and key to realize system applications. Filters are widely used and one of the indispensable key components. As the frequency increases t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/208
Inventor 董宇亮
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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