Integrated microstrip shorted antenna using hybrid active circulator

The design of an integrated microstrip shorted antenna using hybrid active circulator is presented to produce a fully duplexed transceiver with transmit and receive operation at the same frequency and with the same polarization. This design is compatible with the MMIC technology since ferrite circulator needed for duplexer is avoided by a hybrid active circulator based on phase cancellation technique. This integrated active circulator antenna has potential uses in both short-range communication systems and radar systems. Arrays of these elements could overcome the power handling problems that limit the performance of current active circulators