Wideband Transmissive Polarization Rotator With In-Band Notches Enabling Multiband Operation

Ahmed Abdelmottaleb Omar,Jaehong Choi,Abdelhady Mahmoud,Wonbin Hong

doi:10.1109/access.2021.3066638

Ahmed Abdelmottaleb Omar, Jaehong Choi + Show 2 more

Open Access

https://doi.org/10.1109/access.2021.3066638

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Journal: IEEE Access	Publication Date: Jan 1, 2021
Citations: 14	License type: CC BY 4.0

Affiliation: Pohang University of Science and Technology

Abstract

A low-profile and wideband transmissive polarization rotator is proposed in this article. The wideband performance is accomplished by utilizing a curved bowtie resonator. The proposed wideband design exhibits a simulated bandwidth of 129.07% for at least 90% cross-transmission coefficient. The operating bandwidth is from 22.8 GHz to 105.8 GHz and the structure thickness is 0.082 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> , where λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> is the free-space wavelength at the lowest operating frequency. A comparison with previously reported wideband polarization rotator designs is performed to highlight the notability of the proposed design regarding the wideband performance and structure thickness. In addition, in-band notches are utilized within the wide operating band to accomplish a transmissive polarization rotator with multiple operating bands. Single and double notches are employed to achieve polarization rotator designs with dual- and tri-band of operation, respectively. Moreover, the proposed multiband technique enables bandwidth adjustment. The prototype is fabricated and experimentally studied and is found to be highly correlated to the numerical estimation.

Highlights

A transmissive polarization rotator is a structure capable of transmitting and converting the polarization of the incident electromagnetic wave by 90◦ within a certain frequency band
A multiband transmissive polarization rotator was reported in [2] utilizing multiple strip resonators
2) A new technique to accomplish multiband response is reported for the first time. This technique employs the wideband design in point#1 along with vertically oriented strip resonators operate as band notches

Summary

Introduction

A transmissive polarization rotator is a structure capable of transmitting and converting the polarization of the incident electromagnetic wave by 90◦ within a certain frequency band. Wideband transmissive polarization rotators were realized by employing zigzag-shaped resonator [12] A very wideband and stable transmissive polarization rotator is proposed. The proposed design employs a curved bowtie resonator in between two orthogonal wire grid layers.

Results

Conclusion