In this paper, we study the radiation from embedded sources in two-dimensional finite-size “photonic- quasicrystal” PQC slabs made of dielectric rods arranged according to a 12-fold symmetric aperiodic tiling. The results from our investigation, based on rigorous full-wave simulations, show the possibility of achieving broadside radiation at multiple frequencies, with high directivity ͑e.g., 15 dB͒ and low sidelobes ͑e.g., −12 dB͒. We also show that leaky waves are supported by a PQC slab and that the beamwidth is directly proportional to the leaky wave attenuation constant, which provides a physically incisive interpretation of the observed radiation characteristics.
Directive emission from defect-free dodecagonal photonic quasicrystals: A leaky-wave characterization
GALDI V;PIERRO V;
2009-01-01
Abstract
In this paper, we study the radiation from embedded sources in two-dimensional finite-size “photonic- quasicrystal” PQC slabs made of dielectric rods arranged according to a 12-fold symmetric aperiodic tiling. The results from our investigation, based on rigorous full-wave simulations, show the possibility of achieving broadside radiation at multiple frequencies, with high directivity ͑e.g., 15 dB͒ and low sidelobes ͑e.g., −12 dB͒. We also show that leaky waves are supported by a PQC slab and that the beamwidth is directly proportional to the leaky wave attenuation constant, which provides a physically incisive interpretation of the observed radiation characteristics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
