Miniaturized adjustable band-pass filter based on artificial surface plasmon

Abstract

The invention relates to a miniaturized adjustable band-pass filter based on artificial surface plasmon. Metal micro-strips M1 and isolation capacitors are symmetrically arranged at the two ends of a metal strip M2; one side of the metal strip M2 is connected with one end of an artificial surface plasmon unit structure through a variable capacitor, and the other end of the artificial surface plasmon unit structure is connected with a metal grounding surface on the back surface of the dielectric substrate through the variable capacitor and a metalized through hole; and the other side of the metal strip M2 and the other end of the artificial surface plasmon unit structure are connected with a bias circuit feeder line of the variable capacitor through an inductor. The working frequency band and bandwidth of the band-pass filter are regulated and controlled in real time by changing the bias voltage of the variable capacitor without changing the structural size of the variable capacitor. And by utilizing the characteristics of a high-order mode, the space utilization rate is improved, and the characteristics of miniaturization, low crosstalk and high efficiency are achieved. The structure is insensitive to the deformation of the dielectric substrate, can be attached to the surface of a non-planar dielectric substrate, and facilitates the manufacturing of a conformal device.

Description

technical field [0001] The invention belongs to the field of new artificial electromagnetic materials, and relates to a miniaturized adjustable bandpass filter based on artificial surface plasmons, which is a transmission structure without a transition unit, and realizes frequency-adjustable bandpass by changing capacitor bias voltage filter. 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, and has strong near-field confinement. Based on this efficient confinement of optical signals in the sub-wavelength size ...

AI Technical Summary

Problems solved by technology

In the application of high-order modes, first of all, the excitation of high-order modes is relatively difficult, and secondly, the initial frequency and cut-off frequency of high-order modes are often affected by changes in structural parameters at the same time, and independent control of a single frequency cannot be achieved.

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