A Multi Stub Polygon Shaped Textile Antenna for Deformation Performance Using Aperiodic DGS

Abstract

A compact fully flexible antenna with 1.22 as dielectric constant with 0.016 loss tangent is designed for wearable biomedical applications. It has dimensions of 40.5 x 23 x 0.97 mm3. The polygon-shaped patch is modified to achieve ultra-wideband frequencies using partial ground as 16.5mm and a periodic vertical slot of 13x2 mm2 structure in defected ground structure to enhance the wide bandwidth of 2.6-11.1 GHz. Using a transmission line equation and a microstrip line feeding method, the resulting antenna operates at a biomedical frequency in open space and on the body-worn case with multi band i.e. 3.1 and 5GHz. The deformation process works well for the proposed antenna without affecting its actual bandwidth with 20 to 60 mm radii. Additionally, the proposed antenna operates at 5GHz for Wi-Fi with 3.67dBi gain, -35.1dB as S11 which is suitable for commercial applications. CST Microwave Studio was used to simulate the antenna and fabricate it for testing.

Investigation of Electromagnetic Shielding for Wire Mesh Composite for Aircraft against Lightning Strike

“…For a given operating wavelength, we measure the effectiveness of wire-mesh screens in blocking electromagnetic waves. When describing it, the wire-mesh composite corresponding sheet-impedance is utilized [29][30][31][32]. When an electromagnetic wave contacts a mesh, it generates a reactive field that is restricted to the region of the mesh surface due to the periodicity of the mesh aperture and the small electrical size of the mesh aperture compared to the wavelength.…”

“…Above equation1 represent the absorption and reflection loss. The parameters R and A are defined as follows by [28][29][30][31]:…”