Single-cavity double-die hexagonal substrate integrated waveguide filter

Abstract

The invention discloses a single-cavity double-die hexagonal substrate integrated waveguide filter which is high in selectivity, low in loss and small in size. The filter comprises a medium substrate, an upper surface metal layer and a lower surface metal layer, a metallized through hole array penetrating through the medium substrate is arranged on the medium substrate, the metallized through hole array, the upper surface metal layer and the lower surface metal layer define a double-die hexagonal resonant cavity together, an input end and an output end are arranged on the upper surface metal layer, the axis of the input end and the axis of the output end are parallel to the central axis of the double-die hexagonal resonant cavity and do not coincide with the central axis of the double-die hexagonal resonant cavity, two resonant modes of TM11 left leaning and TM11 right leaning of the resonant cavity can be triggered, and a transmission zero point and two poles can be led in. Therefore, the out-of-band selectivity of the filter can be improved without increasing the number of the levels of the filter, meanwhile, the size of the filter is reduced, losses are lowered, and the filter is suitable for being popularized and applied in the technical field of microwaves and millimeter waves.

Description

technical field [0001] The invention relates to the field of microwave and millimeter wave technology, in particular to a single-cavity dual-mode hexagonal substrate integrated waveguide filter. Background technique [0002] Microwave filters are one of the commonly used components in communication systems and wireless systems, and their performance directly affects the quality of the system and the whole machine. Traditional filters are generally divided into planar microstrip or stripline structure filters and metal waveguide structure filters. Although filters based on planar microstrip or stripline structures are easy to integrate with planar circuits, they have large losses and low Q values. Especially in the high frequency field, there is large radiation and poor performance. Traditional metal waveguide filters have the advantages of high Q value, low loss, and good selectivity, but they are bulky, expensive, complex to process, and difficult to integrate with planar ...

AI Technical Summary

Problems solved by technology

A common method to achieve high selectivity of the filter is to increase the number of stages of the filter, thereby generating more transmission zeros to increase the steepness of the stop band and improve the out-of-band selectivity, but this method will lead to an increase in the size of the filter and the design As the difficulty increases, the loss will also increase accordingly, which directly affects the overall selectivity, noise figure, gain, and sensitivity of the system.

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