A novel substrate integrated ridge waveguide structure

Abstract

The invention provides a novel substrate integrated ridge waveguide structure, comprising: a dielectric substrate unit, comprising a lower dielectric substrate and an upper dielectric substrate arranged on the lower dielectric substrate, wherein the dielectric constant of the upper dielectric substrate is different from that of the lower dielectric substrate. A suspended metal column embedded in the upper dielectric substrate along a direction perpendicular to the dielectric substrate unit and periodically arranged on a centerline in the longitudinal direction of the upper dielectric substrate; And a metal strip arranged at the bottom of the suspended metal column. The novel substrate integrated ridge waveguide is composed of two dielectric substrates with different dielectric constants. The gap between the lower surface of the suspended metal column embedded in the structure and the lower surface of the dielectric substrate unit forms the ridge capacitance, which reduces the cutoff frequency of the main mode. In addition, the area between the electrode plates is increased by the metal strips arranged at the bottom of the suspended metal column, so that the ridge capacitance valueis increased, the cutoff frequency of the main mode is further reduced, and the working bandwidth of the obtained main mode is greatly improved.

Description

technical field [0001] The invention relates to the field of microwave guide technology, in particular to a novel substrate integrated ridge waveguide structure. Background technique [0002] With the development of microwave and millimeter wave technology in the field of wireless communication and radar systems, the use of low-cost, high-reliability integrated circuits has become increasingly widespread. Metal waveguides have the advantages of high quality factor (Q) and low loss. However, metal waveguides similar to rectangular waveguides are bulky and costly, which limits their development in the direction of miniaturization and integration. [0003] Substrate integrated waveguide (Substrate integrated waveguide, SIW) is a high-performance, low-loss miniaturized transmission line proposed in recent years. Periodic metal vias are used to replace the metal sidewall of the traditional rectangular waveguide. Its electromagnetic wave propagation characteristics are similar to ...

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Problems solved by technology

On the other hand, the single-mode operating bandwidth of SIW is limited to one octave, which is not suitable for wideband microwave systems

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