An x-band filter power splitter based on substrate integrated waveguide coaxial cavity

Abstract

The invention provides a filtering power divider of an X wave band substrate-based integrated waveguide coaxial cavity. An input and output structure and a substrate integrated waveguide coaxial filtering unit are designed on one side of a dielectric substrate, and a floor is arranged on the outer side of the dielectric substrate; the input and output structure comprise an input end and two output ends; the input end adopts a secondary T-shaped step impedance matching network switched coplanar waveguide feed structure; the substrate integrated waveguide coaxial filtering unit is formed by cascading two substrate integrated waveguide coaxial resonant cavities, and energy is coupled through an opening between the resonant cavities; the two output ends are coplanar waveguide switched micro-strip structures respectively, and a 100-Ohm resistor is connected between the two output ends. The filtering power divider has higher unloaded quality factor, the filtering power divider has remarkable effects for improving the insertion loss of the device and reducing the size of the device, particularly the narrow-band application and performance indexes under relatively high frequency are obviously improved respectively, and the filtering power divider has obvious effects for miniaturization and cost control of modern radar systems.

Description

technical field [0001] The invention relates to a filter power splitter, which is mainly used for the frequency selection and power distribution of signals by the front end of a modern radar communication system. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the miniaturization of wireless communication equipment has become an inevitable trend of future development. As the essential components of the front-end of the wireless communication system, the miniaturization design of filters and power splitters has important research value and commercial value. At present, the research on the miniaturization of single filter and power splitter has achieved certain results, and the relevant information is relatively comprehensive. However, if you want to further reduce the size of the device, you need to consider the design from the system level. Since the filter and the power splitter are generally used together, th...

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Problems solved by technology

[0004] In the article "Compact Filtering Power Divider with Improved Out-of-Band Performance", Chen Ding et al. proposed a filter power divider composed of CQ filter units, but the conventional microstrip resonator used in it, compared with the substrate integrated The waveguide coaxial resonator has a low unloaded quality factor and a large size, and has a large insertion loss in narrowband applications.

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