Abstract: A non-contacting electrical coupler for connecting a linearly movable radio frequency load to a stationary radio frequency power source both having a mean operating wavelength of .lambda.. The coupler comprises a pair of stationary parallel first generally tubular conductor members, each of which have an axially extending opening through the wall thereof. Terminal means are provided near a first end of the first conductor members connecting each of them to opposite sides of the power source. The first conductor members are connected together at a point located a distance substantially equal to odd multiples of .lambda./4 from the first end. A pair of movable second conductor members are disposed substantially coaxially one within each of the first conductor members. Each of the second conductor members have a length substantially equal to .lambda./4 and are axially movable within the first conductor members.