Metasurface Perfect Absorber: Impedance Matching

A Salisbury-screen metasurface absorbs nearly all incident microwave power by matching its input impedance to the impedance of free space — no transmission through the metal backing, no reflection at the front face, everything dissipated as heat in a thin resistive sheet. This simulator builds the full transmission-line model: a resistive sheet in parallel with a quarter-wave-shorted dielectric stub, rendered as a real layered 3D stack with animated incident and reflected wavefronts whose amplitude tracks the computed reflection coefficient. Tune sheet resistance, spacer thickness, spacer permittivity and incident frequency, and watch the reflected wave visibly shrink to nothing exactly when the surface reaches the classic Z_s = Z₀, d = λ/4 matching condition — the same principle behind radar-absorbing coatings and anechoic-chamber tiles.