Guideline for HPM protection and verification based on the method of power balance

An outline is given of a guideline on methodologies for protection and verification of hardness against High Power Microwaves (HPM). The aim of the guideline is to systematize existing practical and theoretical knowledge and results from related basic research into a guideline of practical use in the defence and aircraft industry. The guideline is restricted mainly to back-door coupling (i.e. coupling through apertures and cables into a shielded compartment) for narrow-band HPM. The approach is based on the concept of power balance for overmoded cavities. Other types of HPM as well as front-door coupling (i.e. coupling to antennas and sensors) will be included later.