Duplexing and combining networks

A duplexing network for combining two signals, the network comprising:

• a first port;
• a second port;
• a third port;
• a first hybrid coupler coupled to the first port;
• a second hybrid coupler coupled to the second port;
• a third hybrid coupler coupled to the third port;
• wherein the first hybrid coupler, the second hybrid coupler and the third hybrid coupler are each four-port quadrature hybrid couplers;
• wherein the first hybrid splits a first signal received at the first port between a first diplexer and a second diplexer;
• wherein the second hybrid splits a second signal received at the first port between the first diplexer and the second diplexer;
• wherein the third hybrid receives a first composite signal from the first diplexer and a second composite signal from the second diplexer and constructively sums the first composite signal and the second composite signal to produce an output at the third port.

A duplexing network for splitting two signals, the network comprising:

• a first port;
• a second port;
• a third port;
• a first hybrid coupler coupled to the first port;
• a second hybrid coupler coupled to the second port;
• a third hybrid coupler coupled to the third port;
• wherein the first hybrid coupler, the second hybrid coupler and the third hybrid coupler are each four-port quadrature hybrid couplers;
• wherein the third hybrid splits a first signal received at the third port between a first diplexer and a second diplexer;
• wherein the first hybrid receives a first composite signal from the first diplexer and a second composite signal from the second diplexer and constructively sums the first composite signal and the second composite signal to produce an output at the first port;
• and
• wherein the second hybrid receives a third composite signal from the first diplexer and a fourth composite signal from the second diplexer and constructively sums the third composite signal and the fourth composite signal to produce an output at the second port.

A duplexing network, the duplexing network comprising:

• a first hybrid coupler;
• a second hybrid coupler;
• a third hybrid coupler;
• a first duplexer filter;
• and
• a second duplexer filter;
• wherein the first hybrid coupler, the second hybrid coupler and the third hybrid coupler are each four-port quadrature hybrid couplers;
• wherein a first port of the first hybrid coupler is coupled to a first radio frequency signal port of the duplexing network and a first port of the second hybrid coupler is coupled to a second radio frequency signal port of the duplexing network;
• wherein a second port of the first hybrid coupler is coupled to a first isolation impedance and a second port of the second hybrid coupler is coupled to a second isolation impedance;
• and
• where a third port of the first hybrid coupler is coupled to a first filter port of the first duplexer filter, and a fourth port of the first hybrid coupler is coupled to a first filter port of the second duplexer filter;
• wherein a third port of the second hybrid coupler is coupled to a second filter port of the first duplexer, and a fourth port of the second hybrid coupler is coupled to a second filter port of the second duplexer;
• wherein a common filter port of the first duplexer is coupled to a first port of the third hybrid coupler and a common filter port of the second duplexer is coupled to a second port of the third hybrid coupler;
• wherein a third port of the third hybrid coupler is coupled to a third isolation impedance and a fourth port of the third hybrid coupler is coupled to an antenna port of the quadrature duplexer.