Free space microwave permittivity and permeability measurements

Abstract

Measurements of permittivity and permeability at microwave frequencies using a free space technique are presented for some well known materials and a series of absorptive samples. Free space measurements are especially useful for non-destructive evaluation, and are sometimes the most appropriate method for some composites that may contain large inclusions such as fibres, or over frequency bands where waveguide measurements are impractical to perform.