Substrate integrated waveguide filter based on artificial surface plasmon

Abstract

The invention discloses a substrate integrated waveguide filter based on artificial surface plasmon, and the filter comprises a dielectric substrate, an upper layer circuit board located on the upper surface of the dielectric substrate and a lower layer grounding plate located on the lower surface of the dielectric substrate; the upper layer circuit board comprises an input port, an ML-SIW transition part, a substrate integrated waveguide part, an SIW-ML transition part and an output port; the substrate integrated waveguide part is of an upper-row metal via hole array structure and a lower-row metal via hole array structure which are the same and correspond in parallel; an artificial surface plasmon structure which is formed by metal trough lines and is in bilateral symmetry and up-down symmetry is etched between the upper-row metal via hole array and the lower-row metal via hole array, and the artificial surface plasmon structure comprises N artificial surface plasmon units and a central horizontal trough line. After the cut-off frequency of the upper sideband is reduced, the filter still has a small size, miniaturization and light weight of the filter are facilitated, and good out-of-band rejection capacity is achieved. The upper or lower sideband cut-off frequency of the filter can be adjusted, and the design flexibility is high.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication filtering, in particular to a substrate-integrated waveguide hybrid filter based on artificial surface plasmons. Background technique [0002] In microwave and millimeter wave wireless transceiver systems, the filter is one of the most critical components, which is responsible for frequency band division, spurious wave filtering and frequency selection. The filter based on the substrate integrated waveguide structure has many advantages such as low cost, easy integration, large power capacity and low loss. [0003] Traditional substrate-integrated waveguide filters have two obvious disadvantages. First of all, the out-of-band rejection capability of the substrate integrated waveguide filter is poor, and resonance points often appear near the upper sideband. In order to improve its out-of-band suppression capability, a low-pass filter must be connected in series at the outpu...

AI Technical Summary

Problems solved by technology

[0005] Most of the artificial surface plasmons used in the currently designed artificial surface plasmons and substrate-integrated waveguide hybrid filters adopt a linear or T-shaped or L-shaped metal slot line arrangement structure, which is limited by the working mechanism of the device. , the traditional substrate-integrated waveguide filter based on artificial surface plasmons has a high upper sideband cut-off frequency, and generally works in the X-band (8-12GHz) and Ku-band (12-18GHz). In order to make this device Working in the S or C band, it is necessary to reduce the upper sideband cutoff frequency of the filter

[0006] The existing hybrid filter reduces the upper sideband cut-off frequency by increasing the total length of the metal slot line of the artificial surface plasmon in the device, but increasing the length of the slot line will significantly increase the volume of the filter, which is not conducive to filtering miniaturization and integration of

Moreover, the existing hybrid filter is affected by reducing the upper sideband cut-off frequency, which reduces the out-of-band rejection of the filter

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