An RF coil suitable for use in imaging systems is provided which coil has a dielectric filled cavity formed by a surrounding conducting enclosure, the conducting enclosure preferably being patterned to form continuous electrical paths around the cavity, each of which paths may be tuned to a selected resonant frequency. The second polymer has a crystallinity of less than 20% and is at least partially cross-linked. Switching of connection of the measurement bus net with a measurement terminal pad is electrically controlled properly by X, Y address selection signals outputted from X, Y address decoders to X, Y address selection signal lines.