Patent ID: 7801493

Claim:
A radio multi-coupler system, which connects multiple transceivers to a single antenna, for isolating one or more receivers from co-located transmitter radio signals in a radio frequency range so that radio signal can be simultaneously transmitted from and received through a single antenna, said radio multi-coupler system comprising: A) at least one transmitter, B) a single antenna, defining an antenna electrical impedance within said radio frequency range, C) a quasi-circulator comprising: 1) a matched electrical load having an electrical impedance substantially matched to said antenna electrical impedance, 2) three radio signal splitters adapted to split incoming radio power signals into two substantially equal outgoing radio power signals, and 3) a transformer defining a primary and a secondary coil, wherein the three radio signal splitters and said transformer are arranged produce: (i) a circulation within said quasi-circulator of about one-half of output power of said co-located transmitter in a first direction and a circulation of about one-half of said output power of said co-located transmitter in a second direction opposite said first direction and (ii) a circulation within said quasi-circulator of about one-half of input power received by said antenna in said first direction and a circulation of one-half of said input power received by said antenna said second direction; with said transformer positioned within said quasi-circulator so that substantially all output power of said transmitter that is not otherwise transmitted or dissipated is cancelled in said transformer, and D) at least one receiver adapted to receive remote radio power signals at a output of said secondary coil of said transformer, wherein said remote radio power signals received by said receiver is significantly greater than radio power signals received by said receiver from said co-located transmitter.