Abstract
Based on simultaneous control of the phase and polarization, metallic waveguide transmiarray antennas (MWTAs) with a single feed are proposed to generate multibeams with both high gain and optional polarized states (circular, elliptical, or linear polarization) in the F-band. The phase delay of two orthogonal components can be adjusted in the full range of 0-360° by varying the dimension of each hole in the array. The Gerchberg-Saxton algorithm based on Fresnel diffraction theory is used to calculate the required phase distributions for generating multibeams, which are further achieved by the phase control of unit cells in the MWTA. The phase difference of the two orthogonal components is set to be π/2, which allows us to achieve the required radiating polarized states by selecting the polarization direction of the incident wave. As a proof of concept, the circularly polarized dual- and triple-beam MWTAs with a single feed are designed and simulated. The peak gains are up to ∼29 and ∼28 dBi, the axis ratios are lower than 1.9 dB and 1.6 dB, and the aperture efficiencies are 50.6% and 63.4%, respectively. According to the design, the MWTA prototypes are fabricated for generating the dual- and triple-beams. The measured results in the far field agree well with the simulation. The proposed MWTAs are very promising for applications in wireless and satellite communications in the terahertz and millimeter wave bands.
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