Abstract
Antenna technology is at the basis of ubiquitous wireless communication systems and sensors. Radiation is typically sustained by conduction currents flowing around resonant metallic objects that are optimized to enhance efficiency and bandwidth. However, resonant conductors are prone to large scattering of impinging waves, leading to challenges in crowded antenna environments due to blockage and distortion. Metasurface cloaks have been explored in the quest of addressing this challenge by reducing antenna scattering. However, metasurface-based designs have so far shown limited performance in terms of bandwidth, footprint and overall scattering reduction. Here we introduce a different route towards radio-transparent antennas, in which the cloak itself acts as the radiating element, drastically reducing the overall footprint while enhancing scattering suppression and bandwidth, without sacrificing other relevant radiation metrics compared to conventional antennas. This technique opens opportunities for cloaking technology, with promising features for crowded wireless communication platforms and noninvasive sensing.
Highlights
Antenna technology is at the basis of ubiquitous wireless communication systems and sensors
Given that conventional antennas are conductive, a conventional metasurface cloak cannot be wrapped around the metal, but it needs to include a spacer with sufficient thickness dictated by the required bandwidth[34]
We demonstrate its operation in a commercial base station antenna panel, showing that it can meet all relevant metrics of performance in terms of radiation features, enabling an ideally suited broadband radio-transparent antenna
Summary
Antenna technology is at the basis of ubiquitous wireless communication systems and sensors. 1⁄2J 0 ðk ρÞ þ cTMH0ð2Þðk ρÞ; ρ>r kρ0η0 n ρ0 n n ρ0
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