Ultra-Wideband Reconfigurable Tightly Coupled Array with a High Efficiency

This paper presents novel investigations into an ultra-wideband (UWB) dual-polarized frequency-reconfigurable tightly-coupled dipole array (DP-FR-TCDA). The proposed array achieves efficient operating-band reconfigurability through a uniquely designed reconfigurable ground plane. This ground plane effectively transforms out-of-phase ground-plane reflections into in-phase reflections with minimal insertion loss, enabling seamless operation across two contiguous frequency bands. Simulation results demonstrate that the two reconfigurable states produce overlapping subbands spanning 0.42-1.45 GHz and 1.09-5.65 GHz, respectively. Collectively, these sub-bands offer an overall combined bandwidth of 13.5:1, covering 0.42-5.65 GHz with a voltage standing wave ratio (VSWR) less than 3. These characteristics render the array highly suitable for integrated sensing and communication (ISAC) applications based on UWB systems.