Patent ID: 7541890

Claim:
A circulator capable of simultaneous transmit and receive operations, high frequency, high isolation and broadband performance comprising: an antenna port; a transmission port; a receiving port; wherein each port is connected to a 90 degree combiner/divider for splitting an input signal into two output components, the said output components have a ninety degrees relative phase difference to each other; each of said 90 degree combiner/dividers in addition to the connection to the above mentioned ports has at least two output connections each of which are connected to a Y-junction and if a fourth connection, said fourth connection is attached to a matching load circuit; this arrangement of circuits allows the portion of the phase shifted signals from the transmit port to enter the antenna 90 degree combiner/divider and be recombined in phase at the antenna port, while the rest of the signal enters the receive 90 degree combiner/divider and are phase cancelled; said arrangement simultaneously allows the receive signal entering the antenna port and proceeding to the antenna 90 degree combiner/divider to enter the receive 90 degree combiner/divider and to be combined in phase at the receive port.