Title :
Near-Zero-Index Metamaterial Lens Combined With AMC Metasurface for High-Directivity Low-Profile Antennas
Author :
Turpin, Jeremiah P. ; Qi Wu ; Werner, Douglas H. ; Martin, Benoit ; Bray, Matthew P. ; Lier, Erik
Author_Institution :
Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA
Abstract :
A high-gain reduced-profile antenna is designed by combining the effects of a near-zero-index volumetric metamaterial lens and an artificial magnetic conducting (AMC) ground plane. The AMC/metalens antenna design presented here has 20% reduced height over an equivalent metalens antenna with conventional metallic ground plane at the cost of reduced peak directivity and pattern bandwidth. Both the metamaterial unit cells and the mushroom-type AMC structure are designed independently and retuned in the presence of the other for optimal performance. The lens collimates the electromagnetic radiation of a dipole feed by refraction as well as via a Fabry-Perot cavity effect, with resulting gain and patterns that are better than either mechanism can achieve individually. Full wave simulations of the entire metamaterial and AMC structure with a feed dipole agree well with measurements of the fabricated design.
Keywords :
dipole antennas; electromagnetic wave refraction; lens antennas; metamaterial antennas; AMC ground plane; AMC metasurface; AMC/metalens antenna design; Fabry-Perot cavity effect; artificial magnetic conducting ground plane; electromagnetic radiation; high-directivity low-profile antennas; high-gain reduced-profile antenna; metamaterial unit cells; mushroom-type AMC structure; near-zero-index metamaterial lens; volumetric metamaterial lens; Bandwidth; Dipole antennas; Feeds; Lenses; Magnetic materials; Metamaterials; Antennas; artificial magnetic conductors; metamaterials; microwave lenses; split-ring resonators;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2014.2302845
