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A Reconfigurable Dual-Polarization Slot-Ring Antenna Element With Wide Bandwidth for Array Applications

A reconfigurable dual-polarized slot-ring antenna/ array, switching between Sand C-band with wide bandwidth in each operating state is presented. By simultaneously switching eight p-i-n diode switches, a 2 × 2 C-band antenna array can be reconfigured to an S-band antenna unit cell, and vice versa. Fractal shapes are incorporated into the antenna structure to significantly enhance bandwidth. In the S-/C-band operating state, this antenna shows 69.1%/58.3% fractional bandwidth with a measured maximum realized gain of 2.4/3.1 dBi. For the 2×2 C-band array, the spacing between the elements is less than 0.5 λ\n

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