A micro-wave hygrometer having a dielectric resonator, a micro-wave transmitter and receiver to and from the dielectric resonator, and an electro-static shield surrounding said dielectric resonator and a support supporting the dielectric resonator at the portion where the electric field is small. The...http://www.google.ca/patents/US4103224?utm_source=gb-gplus-sharePatent US4103224 - Micro-wave hygrometer
