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Radar Cross Section estimation of a set of randomly distributed dipoles as an application to RFID in a high density context
No full textMono-static radar cross section (RCS) is estimated for a set of randomly distributed loaded thin dipoles. The RCS calculation is performed using two techniques based on the total backscattered field and the radar equation. Different dipole configurations and complex load impedances are studied in order to highlight the RCS distortion. Numerical Electromagnetics Code (NEC) simulator is used for the computations
Fast Scattering Matrix Computation for Complex Media and Metasurfaces
No full textWe use the Schur complement and partial factorization to compute the scattering matrices of large-scale complex optical systems and large-area metasurfaces, achieving orders-of-magnitude speed-up and reduced memory usage over existing methods.Â
Design of Roger-based Beamforming Antenna Array for Future 5G
No full textA microstrip antenna array is proposed and excited using a microstrip-line. ROGER-3003 is employed as a dielectric material since its advance and environment-friendly features which makes it suitable for the application of 5G and B5G. The antenna is resonating at 28.8GHz with 1GHz impedance bandwidth. It offers 9.19dBi gain illustrating it is perfectly matched and maximum power is delivered to radiating patches. Â
Analysis of phase curve of reflectarray unit cell on Molded Silicone substrate for X-band
No full textIn this research, a square unit cell for X-band reflectarray on molded silicone substrate is investigated for phase curve characteristics. The square patch is simulated in CST and unit cell analysis is done by using the waveguide method. Three different unit cells with copper, conductive textile, and conductive ink are fabricated and tested for return loss and phase characteristics and results are compared with a simulated one
Koch Curve Polar Coordinate Transform for UWB Antenna Applications
No full textFractal antennas allow for the design of Ultrawide-band(UWB) antennas with a reduced footprint; we present anovel technique for generating antenna geometries whichextend the Koch snowflake to angles other than 60 degrees.This is achieved by generating a Koch curve of an arbi-trary indentation angle and then circumscribing the curveabout the origin. Using our method, we achieve a 36 per-cent footprint area reduction compared to a traditional Kochsnowflake antenna with a center frequency of 4.1 GHz
Low-Profile Automotive Antenna Systems for MIMO 5G and L1/L5 GNSS Communications
No full textThis paper presents fully integrated low-profile antenna systems for multiple-input multiple-output (MIMO) 5G and global navigation satellite system (GNSS) for L1/L5 frequency bands. The designs can be used on the vehicle’s roof inside a low-profile housing due to its physical parameters and performance. Two samples are presented using HFSS simulation. The first sample shows the 5G MIMO integration performance with the L1 GNSS band while the second sample is integrated with the L5 GNSS band
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
Effective model of propagation across a metasurface with resonant Mie inclusions
No full textWe study the scattering of waves by a single row of resonant inclusions, of the Mie type. An effective model based on matched asymptotic analyzed is used to account for the small thickness of the array. Hence, instead of the effective bulk parameters, we end up with interface parameters entering in jump conditions for the electromagnetic fields; among these parameters, one is frequency dependent and encapsulates the resonant behav- ior of the inclusions
Design and Analysis of Compact Multi-Band Flexible Antenna for ISM, WLAN, Wi-Fi and 5G sub-6-GHz Applications
No full textDesign and analysis of a compact multi-band flexible antenna are presented here. The antenna was designed using flexible substrate material 5880 having a size of 18mm×18mm×0.254mm. The CPW fed radiator consists of a rectangular-shaped patch modified using a pair of rectangular slots to achieve wideband. Another smaller slot was etched from radiator to achieve a lower resonance. The proposed work offers multi-band functionality covering ISM, WLAN, Wi-Fi, and upper 5G sub-6-GHz bands
A Terahertz Polarization Splitter Using a Hybrid Plasmonic Waveguide
No full textWe investigate a waveguide-based polarization splitter in the terahertz (THz) region, in which a hybrid plasmonic waveguide and a dielectric waveguide are placed in parallel. The eigenmode analysis of each waveguide shows that the phase matching condition is satisfied for the quasi-TE mode and not for the quasi-TM mode, leading to a TM-pass polarizer. The device length is also predicted with the analysis of the supermode of the parallel waveguide