A tunable radio frequency (RF) duplexer is disclosed. The tunable RF duplexer includes a first hybrid coupler, a second hybrid coupler, and an RF filter circuit. The first hybrid coupler is operable to split an RF receive input signal into first and second RF quadrature hybrid receive signals (QHRSs). The first hybrid coupler is also operable to split an RF transmission input signal into first and second RF quadrature hybrid transmission signals (QHTSs). The RF filter circuit is operable to pass the first and second RF QHRSs to the second hybrid coupler and to reflect the first and second RF QHTSs back to the first hybrid coupler. Additionally, the second hybrid coupler is configured to combine the first and second RF QHRSs into an RF receive output signal, while the first hybrid coupler is configured to combine the first and second RF QHTSs into an RF transmission output signal.