With　a　resonant　amplitude-modulation　field　on　two　Rydberg　atoms,　we　propose　a　Rydberg　antiblockade　(RAB)　regime,　where　the　Rabi　oscillation　between　collective　ground　and　excited　states　is　induced.　A　controlled-Z　gate　can　be　yielded　through　a　Rabi　cycle.　Further,　several　common　issues　of　the　RAB　gates　are　solved　by　modifying　the　parameter　relation.　The　gate　fidelity　and　gate　robustness　against　the　control　error　are　enhanced　with　a　shaped　pulse.　The　requirement　of　control　precision　of　the　Rydberg-Rydberg　interaction　strength　is　relaxed.　In　addition,　the　atomic　excitation　is　restrained　and　therefore　the　gate　robustness　against　atomic　decay　is　enhanced.　(C)　2020　Optical　Society　of　America