In this letter, a dual-circularly polarized (dual-CP) multibeam transmit-array (TA) antenna is proposed and demonstrated based on anisotropic impedance surfaces (AISs) and hybrid phase compensation strategy. A set of eight fully planarized TA cells based on cascaded AISs are designed with a constant dynamic phase difference between each other, possessing a periodicity of 0.48λ0 × 0.48λ0 and a total thickness of 0.71λ0, where λ0 is the free-space wavelength at center frequency. By introducing Berry phase determined rotation angles on the eight designed cells, dual-CP transmissive phase delays can be achieved independently. Moreover, planar dual-CP antenna arrays are designed and utilized as the feed cluster of the multibeam TA. The bifocal dual-CP multibeam TA antenna generates eight RHCP beams and eight LHCP beams. The measured peak gain values are between 21.1 and 23.7 dBic, whereas the AR values are all below 3 dB for all the beams. © 2002-2011 IEEE.