Microwave radiation can be used in a variety of applications, including the reduction of microorganisms, can be applied in the healthcare sector, as well as in the food sector, can be used to improve food conservation, for example. For this purpose, the Antipodal Vivaldi Antenna Palm Tree class is ideal for radiating microwave signals, as it has low weight, simple construction, has high directivity, high gain in main lobe and low level of lateral radiation. Therefore, this article presents a low-cost didactic experiment to reduce Saccharomyces Cerevisiae through microwave radiation using the Palm Tree AVA. After 17 hours of exposure of the test culture medium to a 2GHz microwave signal with an average power of 1mW, a reduction in the growth of microorganisms (in dense yeast colonies) of the order of 88% was observed when compared to the control culture medium, free from radiation.