Microwave absorber designs for metal foils and containers

摘要

Means and method for heating loads with microwave energy, with the loads being located on a metal substrate or in a metal container. A layer of organic material is located on the outside surface of the container or substrate, the layer having microwave absorbing substances contained in a minimum thickness of the layer. The absorbing substances include both dielectric and magnetic components that provide useful power absorption, the amount of the dielectric component being effective to compress the wavelength of the microwave energy while simultaneously preserving useful impedance to the magnetic component of the energy. Useful power absorption within a range of minimum layer of thicknesses is obtained. The amounts of the dielectric and magnetic components, in addition, transport the heat generated within the layer to the metal container or substrate at rates sufficient to maintain internal temperature of the layer near that of the load. A thin impedance matching film is located on the surface of the layer opposite that of the metal substrate.