Enhancing electromagnetic transmission through biological tissues at millimeter waves using subwavelength metamaterial antireflection coatings

This paper presents simulation results of two different subwavelength metamaterial-based antireflection coatings operating at millimeter waves. The first design minimizes the reflection from a slab of acrylic and the second design minimizes the reflection from a slab of human tissue comprising skin-blood-skin layers. These designs achieve a relative reduction in the reflected power by 99.5% (23 dB) and 99.9% (35 dB), respectively, at 60 GHz. The overall transmitted power is enhanced by up to 39%, limited by the inherent losses in the tissues.