Patent ID: 8737520

Claim:
A radio frequency (RF) coupling circuit for coupling an RF output of a quadrature combined amplifier, the RF coupling circuit comprising: a phase shifting component comprising a first terminal and a second terminal, the phase shifting component is configured to provide a predetermined phase shift to a first RF signal at the first terminal and provide a phase shifted first RF signal at the second terminal, wherein the first terminal of the phase shifting component is configured to receive the first RF signal from a first output terminal of a first amplifier in the quadrature combined amplifier; and a coupling network configured to provide an RF coupled output, the coupling network comprising a first terminal, a second terminal, and a third terminal, wherein the first terminal of the coupling network is configured to receive a second RF signal from a second output terminal of a second amplifier in the quadrature combined amplifier, wherein the second terminal of the coupling network is configured to receive the phase shifted first RF signal from the second terminal of the phase shifting component, wherein the RF coupled output is provided at the third terminal of the coupling network, and wherein the quadrature combined amplifier includes: a first quadrature coupler connected to a first input terminal of the first amplifier and a second input terminal of the second amplifier, and a second quadrature coupler connected to the first output terminal of the first amplifier and the second output terminal of the second amplifier.