A novel dual-band uniform circular array (UCA) is presented to generate vortex electromagnetic waves. The proposed antenna is designed to operate in C- and X-bands with center frequency of 5.8 GHz and 10 GHz, respectively. To construct a shared-aperture structure, two UCAs operating in different frequencies are combined in a common aperture with different radius. Each UCA is composed of 8 antenna elements in the proposed design. The specific phase shifts for generating vortex waves are obtained by carefully designing the feed networks at the two working frequencies. One prototype is simulated, fabricated and measured to verify the concept. Good agreement between simulated results and measured results are obtained. +1 mode vortex beams are successfully penetrated with the gain of 12.3 dBi in the both C- and X-bands with good vortex phase fronts.

提出了一种新颖的双波段均匀圆形阵列（UCA）来产生涡旋电磁波。所提出的天线设计用于在中心频率分别为 5.8 GHz 和 10 GHz 的 C 波段和 X 波段中工作。为了构建共享孔径结构，将工作在不同频率的两个 UCA 组合在具有不同半径的公共孔径中。在建议的设计中，每个 UCA 由 8 个天线元件组成。通过仔细设计两个工作频率下的馈电网络，可以获得产生涡旋波的特定相移。一个原型被模拟、制造和测量以验证这个概念。获得了模拟结果和测量结果之间的良好一致性。+1 模式涡旋光束在 C 和 X 波段以 12.3 dBi 的增益成功穿透，具有良好的涡旋相位前沿。