Dynamically Regulated Dual-Band Flexible Polarization Converter Based on Vanadium Dioxide Metasurface

Fu, Changfeng; Zhang, Lei; Liu, Lijun; Dong, Shaohua; Yu, Weijun; Liu, Xingbin; Han, Lina

doi:10.2139/ssrn.4286635

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As mentioned in [31], it is challenging to design an LTCP with dual broadband operation, high angle stability, and low IL on a thin dielectric substrate. Recently phase-changing materials (PCMs) like-vanadium dioxide and graphene were used to design tunable linear-to-cross converter and LTCP [36]- [37]. Even though the operations of these PCMs are very attractive, especially at the terahertz (THz) and optical frequencies, but precise controls of the transition temperature, chemical potential, and dielectric permittivity are required.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Single Layer Transmissive Dual-Band Linear to Circular Converter for Non-Adjacent Dual Orthogonal Circularly Polarized Antenna

Dey,

Dey

2024

IEEE Access

View full text Add to dashboard Cite

This paper presents a new dual-band transmissive type linear to circular polarizer (LTCP) on a single-layer ultra-thin dielectric substrate. The unit cell of the converter consists of dual circular split rings and a connected cross-grid dipole at the center, for which the metal layer is engraved on a 0.51 mm thick Taconic TLY-5 substrate. The converter rotates the polarization of the incident linearly polarized (LP) wave into single circularly polarized (CP) transmitted waves at two non-adjacent bands, X and K. The LTCP exhibits oblique angle stability up to 35 with independent controllable frequencies at 11.2 / 22.75 GHz. A prototype of the LTCP is fabricated, and the LP to CP conversion is measured to be between 10-12.54 GHz (22.5 %) and 21.82-24.57 GHz (11.8 %) with a corresponding axial ratio (AR) below 3 dB. The experimental results of the converter confer well with the simulation results at normal and oblique incidences. The size of the designed converter is 0.2  0.2  0.019 L 3 , where L is the wavelength at the center frequency of the lower band. The dual-feed LP stacked radiating patch is integrated with the LTCP to realize dual-band dual orthogonal (RCP/LCP) CP microstrip antenna (CPMA). The shared ground is strategically conceived in designing the dual-feed LP antenna, in which the bottom metal layer serves as a ground plane in the lower band and as a reflector in the higher band to provide broadside radiation. The simulation and measured results validate the design principle of the recommended dual-band dual CPMA.INDEX TERMS Axial ratio, circularly polarized antenna, dual-band antenna, linear to circular polarization converter, metasurface, multilayer stacked geometry, shared ground plane.

show abstract

Section: Introductionmentioning

confidence: 99%

Ultrathin Single Layer Transmissive Dual-Band Linear to Circular Converter for Non-Adjacent Dual Orthogonal Circularly Polarized Antenna

Dey,

Dey

2024

IEEE Access

View full text Add to dashboard Cite

show abstract

Dynamically switchable multifunctional device for terahertz application using vanadium dioxide and graphene-based metasurface

Mistri,

Ghosh,

Sardar

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

In this article, a dynamically switchable and multifunctional metasurface is realized using a combination of vanadium dioxide (VO2) and graphene-based structures. The device can be tuned using the temperature transition property of vanadium dioxide from a wideband linear-to-circular polarization converter (LTCPC) to a wideband linear-to-linear cross polarization converter (LTLPC) and a dual-band absorber. The unit cell is designed with a gold-backed lossy-silicon dioxide (SiO2) substrate with a permittivity of 3.9, and the top metasurface layer is designed with a graphene-based dual triangle loaded split ring (DTLSR) and two stripes of vanadium oxide to cover the split partially. The proposed device can be used as a wideband LTCPC at normal temperature (298 K) from 1.43 THz to 2.85 THz, i.e., 66.35% fractional bandwidth (FBW). At temperatures greater than 341 K, VO2 exhibits metallic properties, and the structure functions as LTLPC from 1.82 THz to 3.31 THz (PCR ≥ 80%), i.e., 58.08 % FBW and maximum polarization conversion ratio (PCR) reported as high as 99.65 %. Furthermore, at this metallic condition, two absorption peaks are obtained at 1.22 THz and 3.30 THz with absorptivity of 93.5% and 100%, respectively. The device offers incident angle invariability up to 40° for LTCPC and up to 50° for LTLPC operation. Further insight into the mechanism of operation is developed using the surface current density and electric field distribution analysis. The advantage of the proposed metasurface over other similar structures is assessed with respect to multifunctional behavior, bandwidth, and stability under oblique incidence.

show abstract

Dynamically Regulated Dual-Band Flexible Polarization Converter Based on Vanadium Dioxide Metasurface

Cited by 2 publications

References 0 publications

Ultrathin Single Layer Transmissive Dual-Band Linear to Circular Converter for Non-Adjacent Dual Orthogonal Circularly Polarized Antenna

Ultrathin Single Layer Transmissive Dual-Band Linear to Circular Converter for Non-Adjacent Dual Orthogonal Circularly Polarized Antenna

Dynamically switchable multifunctional device for terahertz application using vanadium dioxide and graphene-based metasurface

Contact Info

Product

Resources

About