Superconducting reentrant cavities can be used in parametric transducers forGravitational Wave antennas. The Mario Schenberg detector, which is being builtby the GRAVITON group at Instituto Nacional de Pesquisas Espaciais (INPE),basically consists of a resonant mass (ball) and a set of parametrictransducers in order to monitor the fundamental modes of vibration. Whencoupled to the antenna, the transducer-sphere system will work as a mass-springsystem. In this work the main task is the development of parametric transducersconsisting of reentrant superconducting cavity with high performance to beimplemented in the Mario Schenberg detector. Many geometries, materials anddesigns have been tested and compared to optimize parameters such as electricand mechanical Q-factor. The aim is the construction of a complete set of nineparametric transducers that, attached to the spherical antenna, will possiblyreach the sensitivity $h$ $\sim$ 10$^{-22}$ $Hz$$^{-1/2}$ in the near future.
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