Abstract
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.
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