Ultrawideband Suspended Plate Antenna With Enhanced Impedance and Radiation Performance

We describe an ultrawideband (UWB) suspended plate antenna (SPA) with enhanced impedance and radiation performance. This antenna consists of two layers. The bottom plate is suspended above a ground plane and fed by a tapered down feeding strip. The top layer consists of four identical radiating plates, each connected to the bottom plate by a vertical strip. The design is optimized numerically and validated experimentally. The measured results show that the antenna achieves an enhanced impedance bandwidth of 72.7% (2.8-6.0 GHz) for VSWR les 2 with stable radiation performance in terms of gain from 8.0-9.9 dBi, direction of maximum radiation, and high copolarization-to-cross-polarization ratio of ges 12 dB across the lower UWB band of 3.1-4.8 GHz.