Filter and filtering method

Abstract

The invention provides a filter comprising an input port, an output port, a shield case, a medium, at least two layers of half-wavelength resonant cells, at least one layer of quarter-wavelength resonant cell, and at least three layer of grounded resonant cells. The half-wavelength resonant cells and the quarter-wavelength resonant cell are connected in parallel between the input port and the output port. The input port is connected with the first layer of half-wavelength resonant cell, and the output port is connected with the last layer of half-wavelength resonant cell. Each half-wavelength resonant cell is suspended at both ends. One end of the quarter-wavelength resonant cell is grounded through the shield case, and the other end is suspended. The grounded resonant cells surround the half-wavelength resonant cells and the quarter-wavelength resonant cell respectively. Inner sides of the grounded resonant cells are suspended and outer sides are grounded through the shield case. The invention also provides a filtering method.

Description

technical field [0001] The invention relates to the technical field of millimeter wave band filtering, in particular to a millimeter wave band narrowband filter and a millimeter wave band narrowband filtering method. Background technique [0002] With the development of microwave communication and radar systems, mobile handheld wireless communication terminals and individual intelligent weapon systems, aviation and aerospace communication systems have put forward high requirements for the size and performance of microwave devices. At present, the miniature millimeter-wave bandpass filter is the core component of the electronic system, and its performance often directly affects the performance index of the entire electronic system. While the device is miniaturized, in order not to reduce its loss and obtain a higher quality factor, LTCC technology came into being. [0003] Although the current millimeter-wave LTCC filter technology is relatively mature, according to the freq...

AI Technical Summary

Problems solved by technology

[0003] Although the current millimeter-wave LTCC filter technology is relatively mature, according to the frequency characteristics of the millimeter-wave band, the volume of the LTCC narrow-band filter can be achieved at the millimeter level, but in the prior art, often in order to reduce the The coupling strength between them increases the length in the Z direction instead, resulting in the height of the LTCC narrowband filter being too high, and the physical structure is not flexible.

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