28 Salisbury screen absorber

This example is available in .../QW-3D/Standard/Various/Absorbers/salisbury_screen.QWPro in the QW-Modeller examples directory and can be loaded using File®Open Examples... command from main menu.

General Description

The structure is a typical Salisbury screen absorber consisting of dielectric spacer and uniform resistive layer. The Salisbury screen is backed with a conductive surface. The structure is terminated with PMC boundary conditions along Y axis, thus we are analysing infinite structure by modelling only a small part of it with finite dimensions.

Geometry

The Salisbury screen is supposed to work at 3 GHz, thus the thickness of the air spacer considered herein is 25 mm (λ/4). The surface resistance of the resistive layer is Rs= 377 Ω/□, what according to Rs= 1/(th*σ) relation, where th is layer thickness (here th= 0.75 mm) gives σ= 3.53669 S/m.

Post Processing

Reflection coefficient of the Salisbury screen in View Results window.