Design of ultra-wideband Vivaldi antennas for SSPPs loaded with directors
XU Juan
WANG Wei
WANG Junlong
WANG Jianchao
Abstract：A spoof surface plasmon polaritons(SSPPs)based ultra-wideband Vivaldi antenna integrated with a director was proposed in this paper.To address the low gain limitation of conventional Vivaldi antennas,a performance breakthrough was achieved through the synergistic integration of SSPPs waveguides and director loading structures.Initially,an SSPPs waveguide structure featuring periodic grooves was incorporated into the traditional Vivaldi antenna.By optimizing the elliptical gradient matc-hing design,the surface SSPPs mode was effectively excited,yielding significant gain enhancement while preserving ultra-wideband characteristics.Furthermore,a concave-shaped directional array was implemen-ted on the SSPPs-enhanced ultra-wideband Vivaldi antenna.Through meticulous optimization of unit dimensions and periodic arrangement,surface current distribution was precisely controlled and surface wave suppression was achieved,resulting in a peak gain of 12.28 dBi,radiation efficiency up to 98%,and an operational bandwidth spanning 14.63～36.54 GHz.The proposed configuration employs a low-loss Rogers RT5880 dielectric substrate,realizing low-profile geometry,high impedance matching,and stable end-fire radiation characteristics.Simulation results demonstrate that this design simultaneously achieves ultra-wideband operation,high gain,and superior efficiency in millimeter-wave frequencies,providing a novel paradigm for high-performance antenna development in next-generation millimeter-wave.
Keywords：spoof surface plasmon polaritonsvivaldi antennadirectorultra-wideband
Publication Date：2026-06-25
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：9( 382-390 )