Design and implementation of metamaterial polarization converter with the reflection and transmission polarization conversion simultaneously

Abstract

In this paper, a metamaterial polarization converter which can transform linearly polarized (LP) wave into its orthogonal polarization in the microwave region is designed and realized for the simultaneous implementation of the reflection and transmission polarization conversion. The special polarization converter is composed of dielectric substrate sandwiched by the split-ring resonator and the slotted PEC ground. The simulation results demonstrate that the reflection cross-polarization of this converter has a significantly polarization conversion ratio (PCR) over 90% in the frequency bandwidths of 23.50-32.31 GHz, and the transmission cross-polarization of this converter has a high PCR over 95% at frequencies of 7.78 and 13.39 GHz for normal incident LP waves. The simulation results are in good agreement with the experimental ones. Furthermore, the property of reflection and transmission cross-polarization of this proposed converter is stable at low frequencies with incident angle up to 50°. The physical mechanisms of the proposed multifunction polarization converter can be elucidated by the electromagnetic resonant theory based on its current distribution. The proposed polarization converter can be functionalized by changing the parameters of the slotted PEC ground, which has a great potential to be used as a selective polarization filter.

Polarization insensitive symmetrical structured double negative (DNG) metamaterial absorber for Ku-band sensing applications

“…By doing four splits in the inner ring, double absorption peaks are achieved with an increased absorption level with DNG properties. Finally, by creating four splits in the microstrip line, dual-absorption peaks were achieved at 14.62 GHz and 16.30 GHz with unity absorption and large DNG bandwidth which makes the proposed one preferable over previous research 4 , 10 , 15 , 31 , 35 – 41 . The absorption, permeability (real), permeability (imaginary), permittivity (real), permittivity (imaginary), refractive index (real) and refractive index (imaginary) for the corresponding designs are shown in Fig.…”

“…This feature results in a negative refractive index 3 . DNG property of metamaterial depends on its structure, which empowers it for different use like absorbers 4 , 5 , antennas, SAR (specific absorption ratio) 6 , filters 7 , waveguides 8 , invisible clocks 6 , mobile applications 9 , polarization converters 10 , lenses 11 , THz optical applications 12 – 14 and different types of sensor 5 , 15 – 17 . After the first successful ascertainment of metamaterial absorber (MMA) properties, numerous studies are ongoing to design MMA for several applications like GPS positioning application 18 , noise reduction by improving MIMO antenna isolation 19 , reduction of radar cross-section 20 , stealth technology for military use 21 , underwater sound absorption 22 , cryptography 23 , thermal and wavelength selectable microbolometers 24 , cancer cell detection or biosensing 16 , 25 , 26 , imaging 27 , 28 and detection for explosive materials 29 .…”

Triple‐band ultra‐thin linear to circular polarization converter based on transmission metasurface

“…[5][6][7] Circular polarization (CP) based on metasurface is commonly applied to satellite links and is a key part to alleviate the multipath fading and polarization mismatch between the transmitting and receiving antennas. 8,9 And it turns out that an increasing number of people apply CP to antenna gain. 10,11 Circularly polarized waves can be obtained in two ways, one is CP source antennas, and the other is converted by linearly polarized (LP) waves.…”

A Wide Incident Angle, Ultrathin, Polarization-Insensitive Metamaterial Absorber for Optical Wavelength Applications

“…Theoretical explanation of V. Veselago devotee Smith et al to find an artificial double negative (DNG) metamaterial with negative permeability and permittivity [1], [2]. These properties of metamaterials depends on their physical structure that enables them to be used as antennas [3], waveguides [4], filters [5], invisible cloaks [6], absorbers [7], [8], specific absorption rates (SAR) [9], [10], detectors [11], imaging [12], RF lenses [13], superlenses [14], polarization converter [15], various kind of sensors [16]- [19]. After the first corroboration of metamaterial absorbers (MMA) in 2008 by Landy et al, they have been studied vigorously, both theoretically and practically [20].…”