An ultra-broadband electromagnetic metasurface circular polarizer

Abstract

The invention discloses an ultra-wideband electromagnetic super-surface circular polarizer, which comprises a dielectric substrate, a metal resonance array and a metal grounding plate, wherein the metal resonance array is printed on the top surface of the dielectric substrate; the metal grounding plate is printed on the back surface of the dielectric substrate; the metal resonance array comprises a plurality of micro-crack Jerusalem cross units which are arranged in a periodic matrix; each micro-crack Jerusalem cross unit is equal in structure parameter and comprises two orthorhombic I-shaped metal arms, namely a horizontal I-shaped metal arm extending in the horizontal direction, namely an X axis, of the dielectric surface, and a vertical I-shaped metal arm extending in the vertical direction, namely a Y axis, of the dielectric surface; the center of a horizontal metal wire at the middle part of the horizontal I-shaped metal arm is intersected with the center of a vertical metal wire at the middle part of the vertical I-shaped metal arm; two micro-cracks which run through the horizontal metal wire at the middle part are etched on the horizontal metal wire at the middle part of the horizontal I-shaped metal arm; and the two micro-cracks are symmetrically located at the left side and the right side of the vertical metal wire at the middle part of the vertical I-shaped metal arm. The ultra-wideband electromagnetic super-surface circular polarizer has the characteristic of high working frequency.

Description

technical field

[0001] The invention belongs to the technical field of microwave passive devices and microwave communication, and relates to a polarization device, in particular to an ultra-broadband electromagnetic metasurface circular polarizer. Background technique

[0002] The polarization state of electromagnetic waves is an important characteristic of electromagnetic waves, which is characterized by the time-varying characteristics of the orientation of the electric field intensity vector at a given point in space, and is described by the trajectory of the endpoint of the electric field intensity vector changing with time, including linear polarization, circular There are three types of polarization: polarized and elliptical. In many cases, the polarization direction of electromagnetic waves plays a key role in practical applications. This characteristic is used in reflector antennas, imaging systems, sensors, and antenna radomes. Traditional electromagnetic wave pola...

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