Miniaturized artificial surface plasmon transmission line based on interdigital structure

Abstract

The invention relates to a miniaturized artificial surface plasmon transmission line based on an interdigital structure, which includes a dielectric substrate, a metal slotted line, two matching units, and two microstrip feeder lines. The metal slotted line and the matching units are located on the same side of the dielectric substrate. The microstrip feeder lines are located on the other side ofthe dielectric substrate. The two matching units each have an end connected to the metal slotted line, and each have the other end overlapping the two microstrip feeders, respectively. The two matching units and two microstrip feeder lines are symmetrically arranged at both ends of the metal slotted line. The metal slotted line includes a plurality of slotted units. The interdigital structure composed of a plurality of metal bars is arranged in the slotted units. The miniaturized artificial surface plasmon transmission line has high-efficiency transmission characteristics, achieves the cut-off characteristics of lower-frequency electromagnetic waves on the premise of keeping the line width dimension of the transmission line unchanged, realizes the miniaturization design of the transmission line, can quickly realize specific miniaturized artificial surface surface plasmon transmission lines of different degrees, has the characteristics of low crosstalk and high efficiency, improves thespace utilization rate, facilitates processing, and has low cost.

Description

technical field [0001] The invention belongs to the field of novel artificial electromagnetic materials, in particular to a miniaturized artificial surface plasmon transmission line based on an interdigitated structure. Background technique [0002] Surface plasmon polaritons (surface plasmon polaritons) are a special electromagnetic response generated at the interface between metal and dielectric. In the natural state, it generally exists in high-frequency bands such as near-infrared and optical bands, and manifests as a form of surface wave propagating along the metal surface at the interface between the metal and the medium. The electric field of the surface wave decays exponentially along the normal direction of the interface, which has a strong binding property. Due to the high-intensity confinement of light at subwavelength dimensions, surface plasmons are widely used to break through the diffraction limit and build various highly integrated optical components and cir...

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Problems solved by technology

But at the same time as the cut-off frequency is reduced, the confinement of the transmission line to the wave is strengthened due to the increase of h, which leads to the reduction of the transmission distance

Adjusting the cutoff frequency by increasing h, or adding additional structures tends to increase the lateral dimension of the transmission line; affecting the transmission efficiency of the transmission line

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