There is provided a circulator device (200a). The circulator device comprises two magnet-free circulators (220a,220b). Each magnet-free circulator has a forced time variance. The circulator device comprises ports (240a,240b,240c). The two circulators are in the circulator device arranged to have mutually anti-phase time variance. Each of the two circulators is coupled to all of the ports. There is also presented an isolator device comprising such a circulator device. There is also presented a radio transceiver device comprising such a circulator device or isolator device.