The following thesis deals with the design and realization procedure of two wearable antenna prototypes, to be included in a microwave system for brain stroke diagnosis and monitoring. This type of system use one antenna to transmit microwaves into the brain, in order to collect then the field scattered by the tissues with the others antennas of the array. The scattered signal contains the information about the contrast between the electrical properties of the stroke and those of the surrounding tissues, permitting to reconstruct an image of the object. What distinguishes this technique for stroke diagnosis from the others is that it does not use ionizing radiations and it does not involve high costs.