Dual-Band CP Antenna with Aperture-Shared Reflective Arrays and FPC Antennas

In recent years, significant research has focused on aperture-shared reflective arrays and FPC antennas [12] [27]. However, the current designs lack CP functionality or have limited CP capabilities, such as narrow bandwidth and limited gains. To address this issue, our paper presents a dual-band antenna that integrates CP functionalities for both higher and lower spectrums. This is the first time that high gain FPC and RA have been combined to achieve dual-band CP radiation while maintaining a wide operating bandwidth. The antenna configuration consists of a feeding ME-dipole, a polarizer integrated dual-functional surface (PIDFS), a feeding horn, and 3D printed supporters. In the higher band, the PIDFS facilitates wave reflection and CP generation. Additionally, it acts as a CP partially reflective surface (PRS) for the lower band FPC antenna operation. Importantly, both antennas share the same radiation aperture, resulting in a high level of integration. The operating bandwidths for both bands are extended due to the wide bandwidth of the PIDFS and feeds. The design principles of the proposed antenna are also discussed. Considering these performances, the antenna shows great potential for future high-speed communication systems with high integration.