Wideband RCA Using a True-Time-Delay Metasurface: an Experimental Demonstration

This paper reports a planarized wideband resonant cavity antenna (RCA) built using a true-time-delay metasurface (TTD-MS). The TTD-MS mimics a curved reflector to enable multimode resonance, hence widening the 3dB bandwidth of the RCA from 5% (for a flat metallic reflector) to 21.3% while the achieved peak gains are comparable, at around 17.5 dBi. Simulation and preliminary experimental measurements are in good agreement and show that the TTD-MS has similar radiation performances to an RCA with the curved reflector, achieving a gain-bandwidth product (GBP) of 12. The planarization achieved dramatically simplifies the antenna’s fabrication.