Patent ID: 6018279
Filing Date: 2000-01-25
Classification: H01P

Abstract:
A radio frequency (RF) coupler for transferring RF power between a first circuit on a rotary shaft having a rotation axis and a second circuit relative to which the shaft can rotate, the RF coupler comprising, a first RF transmission line arranged to rotate with said rotary shaft about said rotation axis and for connection to said first circuit, and a second RF transmission line relative to which said first RF transmission line can rotate and for connection to said second circuit, wherein said first and second RF transmission lines comprise first and second electrically conductive tracks arranged coaxially around said rotation axis in substantial, mutually overlapping relationship to provide RE coupling between the first and second RF transmission lines, each said electrically conductive track having a gap defining a pair of ports in the track, one said port being connectable to a respective said circuit and another said port being connected to a termination for reflecting RF power.