Abstract
Reconfigurable antennas have been widely employed for beam scanning in recent years. However, such antennas are usually limited by narrow bandwidth. To overcome this challenge, we present a linearly polarized 2-bit ultra-wideband (UWB) antenna array in C-band. The antenna array consists of 16 Vivaldi elements, 16 wideband phase shifters and a feeding network. The structural symmetry is employed to provide a couple of opposite phase states in the broad bandwidth. The measured results show that the antenna array can operate well in a broad bandwidth from 4.0 to 5.5 GHz (the relative bandwidth ~31.5%) with reflection loss lower than −10 dB. The scanning angle ranges from −45° to 45° with the sidelobe below −10dB, which agrees well with the theoretical predictions. The design features low cost, simple structure, easy fabrication and broad bandwidth.
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