Time domain material characterizations using leaky lens antennas

A novel time domain methodology to find the permittivity of materials at mm-wave frequencies is investigated. A wide-band, and non-dispersive leaky lens antenna together with an in-house fabricated wavelet generator, transmit high frequency short pulses through a dielectric slab. A non-dispersive dielectric represents an amplitude change due to the losses and the mismatch at the dielectric interface and a delay in the time domain signal that associated with the permittivity. The effects of a plexiglas dielectric slab on the time domain signal is shown and the delay in the signal is used to find the permittivity of the slab.