Radar Cross Section

RCS Reduction of Integrated Antenna Arrays with Resistive Sheets

“…There is no major di erence between the three cases for low frequencies, i.e., λ > λ 0 ≈ length of transition zone. For higher frequencies, the improvement is larger for the smooth transition, see also [7,Ch. 8].…”

“…The grating lobes can occur if the inter-element spacing is larger then half a wave length [2,9,11]. Edge di raction can be interpreted as a di raction by the rapid change in the scattering properties between the antenna and its surrounding [7]. As an antenna is designed to absorb energy in its operational band, the in-band di raction is signi cant if the antenna is integrated in a non-absorbing environment.…”

“…Tapered resistive edge treatment can be used to reduce edge di raction and di raction from impedance discontinuities [6,7]. The resistive sheet is highly conductive σ ≈ ∞ and very thin d ≈ 0, and is such that σd = R −1 , see e.g., [7,10,12].…”

“…The resistive sheet is highly conductive σ ≈ ∞ and very thin d ≈ 0, and is such that σd = R −1 , see e.g., [7,10,12]. They are commonly used in radar absorbing materials (RAM) such as Salisbury screens and Jaumann absorbers [7].…”

Electromagnetic Shielding Features in Lightweight PVDF-Aluminum Based Nanocomposites

“…Metals are particularly suitable as shielding material against electromagnetic fields due to their high electrical conductivity (order of magnitude 10 6 Siemens/cm) [2]. Depending on the electromagnetic properties, the material can be either used as an absorber or a reflector of electromagnetic radiation [3,4]. However, there are few drawbacks when metal is used as a shielding material, its weight as well as its easiness to corrosion being the most important ones.…”