Miniaturized half-mode substrate integrated waveguide filter with wide stop band

Abstract

The invention relates to a miniaturized half-mode substrate integrated waveguide filter with a wide stop band, which belongs to the technical field of electronic devices and comprises a half-mode substrate integrated waveguide (SIW) cavity resonator arranged on a dielectric substrate, a groove is formed in an area, with the strongest magnetic field, of a second resonant mode of the half-mode SIW cavity resonator; a dual-mode microstrip line resonator is inserted into the groove, and high-impedance lines respectively extend from the bottom end of the microstrip line resonator to the two sides of the microstrip line resonator and are inserted into gaps between the microstrip line resonator and the groove; and a coplanar waveguide input port and a coplanar waveguide output port are respectively arranged on two sides of the half-mode SIW cavity resonator. According to the half-mode SIW cavity resonator, the slot is formed in the position where the magnetic field of the second resonant mode of the half-mode SIW cavity resonator is strongest, so that the resonant frequency of the half-mode SIW cavity resonator is close to the frequency of the first resonant mode, a dual-mode resonator is formed, the number of resonators is reduced, and the area of the filter is not increased.

Description

technical field [0001] The invention relates to the technical field of electronic devices, in particular to a miniaturized semi-mode substrate integrated waveguide filter with a wide stop band. Background technique [0002] Substrate Integrated Waveguide (SIW) filters are widely used in airborne platforms, communication satellites, ground stations and wireless base stations due to their low loss, high Q value and easy integration with other planar structures. With the continuous development of modern communication technology, the miniaturization, high reliability and high integration of communication systems are constantly facing challenges. In order to make the bandpass filter meet the performance requirements of the continuous development of the communication system, it has a smaller volume , wide stopband and high selectivity are very important. [0003] Currently, the most common method to achieve miniaturized SIW filters is to use half-mode, quarter-mode, or one-eighth...

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Problems solved by technology

[0004] When designing miniaturized high-performance SIW filter devices, if cascaded half-mode, quarter-mode or one-eighth mode substrate-integrated waveguide cavities are used to achieve high selectivity, special The design structure of the SIW can only make up for the defect of pure magnetic coupling between the SIW cavities, and the volume of the filter is larger due to the cascading of multiple resonators, and in order to achieve a higher filter order and a better The performance of the SIW filter composed of dual-mode or multi-mode resonators usually needs to be cascaded with multiple resonators, making the final filter volume larger. Therefore, the miniaturization technology of the traditional SIW filter cannot Sufficiently reduce the area of ​​the filter; As for the realization of wide stopband, traditional technology is generally only suitable for filters with lower orders, and cannot realize the suppression of high-order modes in the case of higher orders. Therefore, how to design A SIW filter with wide stopband and real miniaturization is what needs to be considered at this stage

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