A microwave apparatus comprising: a microwave source (2, 4) to provide a microwave signal, connectable to a load (10)； a control means (12) configured in operation to select power and frequency characteristics of the microwave signal in order to perform a desired operation on or by the load, in which the frequency characteristics selected to perform the desired operation comprise the variation in a frequency range of a frequency of the microwave signal provided by the source during the performance of the desired operation； a microwave detector (14, 16) for carrying out microwave measurements, arranged to receive reflections from and / or transmissions to the load in operation and configured to perform several measurements during the desired operation, each measurement corresponding to a respective frequency of several different frequencies of the frequency range； and a means for determining (12) from the various measurements a reflection measurement and / or a transmission measurement, in which the determination means is configured to process the various measurements together in order to obtain the reflection measurement and / or the transmission measurement for the frequency range.Un aparato de microondas que comprende: una fuente de microondas (2, 4) para proporcionar una señal de microondas, conectable a una carga (10)； un medio de control (12) configurado en funcionamiento para seleccionar características de potencia y frecuencia de la señal de microondas con el fin de realizar una operación deseada en o por la carga, en el que las características de frecuencia seleccionada para realizar la operación deseada comprenden la variación en un rango de frecuencia de una frecuencia de la señal de microondas proporcionada por la fuente durante la realización de la operación deseada； un detector de microondas (14, 16) para la realización de mediciones de microondas, dispuesto para recibir reflexiones procedentes de y/o transmisiones hacia la carga en funcionamiento y con
