A method of rapid prototyping of a microwave device, by: providing a plurality of thin sheets of low loss dielectric film, each sheet having a different metallization pattern formed thereon; providing a base onto which each of the plurality of thin sheets of low loss dielectric film can be received, wherein the base comprises a metallization pattern formed thereon such that the placement of each of the plurality of thin sheets thereon forms a different circuit; and sequentially placing each of the plurality of thin sheets of low loss dielectric film onto the base, thereby sequentially forming different circuits across the thin sheet and the base.