Millimetre-wave measurements using the ring resonator

This thesis presents a thorough analysis of the ring resonator, and studies the use of the ring at millimetre-wave frequencies (above 30GHz). An equivalent circuit for the ring is derived which is useful for extracting data from measured circuits, and accounts for different loss mechanisms and loading effects of the feed circuit. New analysis is presented on the effects of curvature, which is shown to influence the resonant frequencies and cause radiation which increases the loss in the ring.