access icon openaccess Multi-layer broadband asymmetric transmission of linearly polarised in active metasurface

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 19/02/2019, Accepted 02/05/2019, Published 30/05/2019

Although many different kinds of polarisers have been extensively studied in the last 20 years, most previous designs were passive and single-functional designs. In this study, a kind of a new active polarisation converter is designed. The active polarisation converter is comprised of periodically arranged circular ring embedded with PIN diodes. Four different results of polarisation transformation and reflection can be presented by controlling the bias voltage of the PIN diodes. The full-wave simulation results show that the proposed metasurface can rigorously satisfy the asymmetric transmission and can achieve cross-polarisation conversion with high efficiencies for linearly polarised waves. In addition, there is another particularly obvious advantage of the proposed structure is its broad operation bandwidth in microwave band, the bandwidth of the polariser reaches 70%, more than 90% cross-polarisation conversion efficiency is observed from 6.5 to 13.5 GHz.

Inspec keywords: p-i-n diodes; microwave metamaterials; electromagnetic wave polarisation; electromagnetic wave transmission

Other keywords: active polarisation converter; linear polarisation; periodically arranged circular ring; PIN diodes; reflection; polarisation transformation; active metasurface; single-functional designs; polariser; microwave band; cross-polarisation conversion efficiency; full-wave simulation; frequency 6.5 GHz to 13.5 GHz; multilayer broadband asymmetric transmission; bias voltage; linearly polarised waves

Subjects: Junction and barrier diodes; Electromagnetic waves: theory; Metamaterials and structures (microwave)

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