Measurement of microwave ovens radiation between 1 and 18 GHz in relation with the CISPR standardisation activities

This paper describes a study conducted to characterise the radiation emitted by microwave ovens between 1 and 18 GHz, both inside and outside the oven allocated band (2.4-2.5 GHz). Results are presented in conjunction with the on-going work within a CISPR ad-hoc group in charge of defining the emission limits for microwave ovens and other ISM equipment between 1 and 18 GHz, with the exclusion of the allocated ISM bands. The emphasise is on the frequency and time domain characteristics of this emission, by illustrating the significant difference between the peak and the average emitted level. Different weighting functions are discussed and the corresponding measured results are presented.