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

• Published in: IEEE access Vol. 9; pp. 44751 - 44756
• Main Authors: Omar, Ahmed Abdelmottaleb, Mahmoud, Abdelhady, Choi, Jaehong, Hong, Wonbin
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Bandwidths; Broadband; Dielectrics; Dual band; Multiband; Notches; Polarization; polarization conversion; Resonant frequency; Strips; Thickness; transmissive polarization rotator; Tuning; Wideband; Wires
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2021.3066638

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 <inline-formula> <tex-math notation="LaTeX">0.082~\lambda _{\mathrm {max}} </tex-math></inline-formula>, where <inline-formula> <tex-math notation="LaTeX">\lambda _{\mathrm {max}} </tex-math></inline-formula> 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.