Design of a Wideband Millimeter Wave Optically Transparent Absorber Covering the V-, W-, and D-bands

A wideband millimeter wave (MMW) optically transparent absorber is designed using multilayered indium tin oxide films fabricated on the polyethylene terephthalate substrates, covering the V-, W-, and D-bands. Full-wave simulations are performed to verify the design. The absorbing bandwidth is from 49.5 to 170.6GHz (110.04%) for the perpendicularly incident wave, in which the absorptivity is over 90%. The total thickness of the absorber is 492μm or 0.081λ
L
, where the λ
L
is the wavelength at 49.5GHz. The MMW absorber is polarization-insensitive and with wide-angle absorbing properties which are also studied in the numerical demonstration.