Substrate integrated waveguide filter

Abstract

The invention discloses a substrate integrated waveguide filter which is high in selectivity, small in size and low in loss. The substrate integrated waveguide filter comprises a first metal layer, a first dielectric substrate, a second dielectric substrate, a second metal layer and a metallization through hole array, the first metal layer, the first dielectric substrate, the second dielectric substrate, the second metal layer and the metallization through hole array are sequentially stacked from top to bottom, and a first band-shaped coupling unit and a second band-shaped coupling unit are arranged between the first dielectric substrate and the second dielectric substrate. By means of the substrate integrated waveguide filter, the LTCC technology is adopted for integrating the band-shaped coupling units into resonant cavities of the substrate integrated waveguide filter, a signal transmission channel can be added without increasing the number of the resonant cavities, a transmission null point can be accordingly obtained in an attenuation band, and the selectivity of the filter is improved; meanwhile, the position of the transmission null point can be flexibly controlled by adjusting the resonant frequencies of the band-shaped coupling units, more stages of the resonant cavities are not needed, and the substrate integrated waveguide filter has the advantages of being small in size, light in weight and low in loss. The substrate integrated waveguide filter is suitable for popularization and application in the microwave millimeter wave technical field.

Description

technical field [0001] The invention relates to the field of microwave and millimeter wave technology, in particular to a substrate integrated waveguide filter. Background technique [0002] The filter is one of the most basic basic circuits in the communication system, and its performance is directly related to the performance of the entire system. Traditional filters are generally divided into planar microstrip or stripline structure filters and metal waveguide structure filters. Although planar microstrip or stripline structure filters are easy to integrate, they have large radiation loss and low Q value. Although metal waveguide structure filters have the characteristics of low loss, high Q value, and good selectivity, they are large in size and complex in processing and debugging, which is not conducive to integration with active circuit substrates. The filter based on the substrate integrated waveguide technology not only retains the advantages of easy integration an...

AI Technical Summary

Problems solved by technology

[0003] In order to meet the higher requirements of the modern communication system on the size and selectivity of the filter, the design of the traditional substrate integrated waveguide filter structure generally obtains more transmission zero points by increasing the number of resonator stages to improve the out-of-band Selectivity, but limited by the large footprint of the substrate integrated waveguide resonator, as the number of resonators increases, not only the size of the filter will increase, but also its loss will increase accordingly, so the selection of the communication system direct impact on performance, noise figure, gain, and sensitivity

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