Using electrophoretic deposition it is possible to prepare massive are
a thick film which shows good superconducting properties in the microw
ave field; it opens perspectives for the application of polycrystallin
e YBCO layer in RF cavity. A coaxial resonator with an inner conductor
which is coated in YBCO layer by electrophoresis is used to measure t
he surface resistance of YBCO at 500 MHz. The recent results are as fo
llows: R(300 K)=124 m Ohm, R(77 K)=0.6 m Ohm.