Sibel Cimen

Planar Octagonal-Shaped UWB Antenna With Reduced Radar Cross Section

A novel planar octagonal-shaped antenna with reduced radar cross section (RCS) for ultra-wideband (UWB) applications is designed and demonstrated experimentally. The proposed antenna is modified using the geometrical shaping method in order to get the RCS reduction. This method is based on the subtraction of metal areas which have the minimum current distributions on the surface of printed antenna. Both of the reference and modified octagonal-shaped antennas are operating at 2.5-18 GHz frequency range with %151 fractional bandwidths. The full-wave electromagnetic simulations and laboratory measurements are performed to characterize their RCSs as a function of frequency, radiation patterns and scattering characteristics. The radiation performance of modified antenna is stable and consistent with the reference antenna. Also the results show that the designed UWB antenna has lower RCS compared to the reference antenna. About 10 dBsm RCS reduction is obtained in the whole operation bandwidth. The designed antenna has very large RCS reduction up to 25 dBsm, especially in the low frequency range.

An octagonal shaped ultra wide band antenna with reduced RCS

In this study, an octagonal shaped ultra wide band (UWB) antenna which radiates at 2.5-18 GHz is designed. The designed antenna covering the entire band is assigned for the UWB applications, which is about 150%. The RCS (radar cross section) of the designed antenna is reduced by modifying the physical structure. RCS of the antenna is reduced up to 25 dB. The proposed antenna is fabricated and the experimental results of the radiation performance are in a good agreement with the simulation results.

An arrow shaped ultra wide band antenna with reduced RCS

In this study, an ultra wide band (UWB) antenna which radiates at 3-15 GHz is designed. The designed antenna has an arrow shaped patch and a ground layer. The size of the antenna is 41×31 mm and its easy to produce. Because it has a simple geometric structure. The RCS (radar cross section) of the designed antenna is reduced by modifying the physical structure. RCS of the antenna is reduced up to 25 dB. The proposed antenna is fabricated and the experimental results of the radiation performance are in a good agreement with the simulation results.

A novel reflecarray antenna backed with double layer FSS for RCS reduction

In this paper, a novel frequency selective surface (FSS) is designed for reduction of radar cross section (RCS) level in the reflectarray antenna. A 9×9 variable size FSS structure is constructed on double opposite side geometry. The reduction of RCS performance is compared with ground plane backed and designed FSS backed reflectarray antenna. The simulation results demonstrate that the FSS backed reflectarray antenna can achieve the reduction of RCS level in-band and out-of-band. Also gain and radiation performance of FSS backed reflectarray antenna is nearly same with ground plane backed reflectarray antenna.

Analytical & Numerical Calculations of S-Parameters in Multilayer DPS-DNG Junctions

Metamaterials (MTM) have recently attracted much attention in electromagnetic engineering. Initial studies have focused on understanding their electromagnetic properties and responses, but applications have also begun to appear in the literature. This paper presents visualization of electromagnetic waves interacting with multi-layer MTM slabs in two-dimension as well as analytical and numerical S-parameter extraction.