Artificial surface plasmon polariton and microstrip line conversion structure and method

Abstract

The invention provides an artificial surface plasmon polariton and microstrip line conversion structure and method, the conversion structure comprises a metal patch and a transition microstrip line, the metal patch is a step-shaped structure with gradually increased width, and the width of the metal patch is the size of the metal patch perpendicular to the electromagnetic wave propagation direction; the side, with the smaller width, of the metal patch is connected with the microstrip line, and the side, with the larger width, of the metal patch is connected with the transition microstrip line. One side of the transition microstrip line is connected with the metal patch, and the other side of the transition microstrip line is connected with the artificial surface plasmon polaritons. Mode matching and conversion between the microstrip line and SSPPs can be achieved, no extra metal patch needs to be introduced, integration between different devices is facilitated, the machining difficulty is low, the structure is compact, the size is small, and miniaturization of the devices can be achieved. When the antenna is applied to millimeter wave and terahertz frequency bands, the loss is small and the processing difficulty is low.

Description

technical field [0001] The invention relates to the technical field of surface plasmons, in particular to a conversion structure and method of artificial surface plasmon polaritons and microstrip lines. Background technique [0002] When light is incident on the metal surface, the light wave will be coupled with the free electrons on the metal surface, resulting in an electromagnetic wave propagating along the interface between the metal and the medium, which is called surface plasmon polaritons (SPPs). ). Artificial surface plasmon polaritons (SSPPs) are analogs of SPPs in the low frequency band (30-150KHz), which unify the electromagnetic wave mode in the terahertz band with the SPPs in the optical band. Compared with SPPs, the advantage of SSPPs is that its dispersive properties and the ability to confine electromagnetic fields are determined by the geometrical parameters of the structure, and its structure usually has multiple adjustable geometrical variables, so that i...

AI Technical Summary

Problems solved by technology

However, this conversion structure needs to add an additional metal strip structure along the groove direction, which is not conducive to processing and integrating other devices in this direction, and the size of the period is at least larger than 1 SSPPs

In addition, the conversion structure is applied in the microwave frequency band. If it is applied in the millimeter wave and terahertz frequency bands, the distance between the metal strip and the microstrip line needs to be very close, which will increase the difficulty of processing.

[0005] The existing artificial surface plasmon and microstrip line conversion structure is large in size and not compact enough, and the application technology in the millimeter wave and terahertz frequency bands is relatively difficult, and it is difficult to achieve good results

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