This technology consists of several design concepts for narrowband RF high power loads producing technically usable hot outlet water or air. Conventional RF power loads produce cooling water at barely usable low pressure and moderate temperature (fragile ceramic parts, different expansion coefficients). Proposed are RF loads producing cooling water >150 °C at up to 100 bar pressure, as well as hot air up to 800 °C. One concept is the application of normal steel corrugated waveguide structures near cut-off. This concept could find practical use above several GHz. Another solution is resonant structures made of normal magnetic steel to be installed in large waveguides for frequencies of 500 MHz or lower. Similar resonant structures above 100 Mhz taking advantage of the rather high losses of normal steel may also be used in coaxial line geometries with large dimensions. In addition, there are concepts based on SiC foam and ferrite coated load.
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