6 research outputs found
Chiral SRR metasurfaces for circular polarisation conversion
Get PDFA circular polarization dual band metamaterial polarization rotator composed of two double split ring resonators rotated 90° with respect to each other is presented. Asymmetric transmission between T xx and T yy and symmetric transmission between T xy and T yx has been achieved. The circular polarization is caused by the symmetric transmission between T xy and T yx . The design has been demonstrated numerically at microwaves frequency. The structure holds promise for ultra-compact polarizing devices for any frequency range given the scalability of the approach
A dual band inverted L monopole antenna based on Complemenatry Split ring Resonator for RFID applications
No full textDouble Layer Metamaterial Superstrate for Performance Enhancement of a Microstrip Patch Antenna
No full textThermal Effect of Microwave Radiation on <italic>Dactylopius opuntiae</italic> in Morocco and Coaxial Probe for Permittivity Measurements
No full textDactylopius opuntiae (D. opuntiae), commonly referred to as cochineal scale insect or wild cochineal, poses a considerable risk to cactus plantations globally. Various control methods, including chemical pesticides and biological treatments, have been employed to control the D. opuntiae pest. This paper presents an innovative approach to use microwave radiation as a pest management method for D. opuntiae, in cactus plantations. This method stands out due to its advantages of selective treatment, chemical free, and no environmental impact. This research work details the use of plane wave for simulating the influence of microwave radiation using electromagnetic model, on cactus pear and three distinct stages of adult females of the D. opuntiae. The findings demonstrated that the distribution of thermal energy indicates the ability of electromagnetic radiation to raise D. opuntiae’s thermal energy above that of the cactus pear at various industrial, scientific, and medical (ISM) band frequencies. Additionally, the developed microwave heating system demonstrates the capability of microwave radiation at 2.45 GHz to eliminate various stages of adult D. opuntiae without harming the host plant’s quality. The study also explores the impact of adjusting input power and treatment duration to manage D. opuntiae effectively
Mutual coupling Reduction in antenna arrays using Metasurface
No full textIn this paper, a meta-surface is developed as an effective solution for reducing mutual coupling between two adjacent antennas. The meta-surface comprises an array of omega shape resonators placed above two closely antennas. The simulated results show a 24 dB reduction in coupling when placing meta-surface over two adjacent antennas separated by a spacing of 1/5 wavelength at frequency of 2.85 GHz. Furthermore, the gain of antenna arrays with the meta-surface is also improved by 3dB
