System for generating a recording electromagnetic field having a given configuration

The present invention pertains to the field of alarm-signal generating systems and essentially relates to a system for generating a recording electromagnetic field. This system includes an emitting unit (1) with an emitter (3) and an emitting antenna grid (4) as well as a receiving unit (2) with a receiver (7) and a receiving antenna grid (8), wherein said units are located at a distance from each other. The emitting and receiving units include diagram-generation means (6, 9) and phase-generation means (5, 10), respectively. When the electromagnetic field has a complex configuration or when it is necessary to monitor simultaneously a plurality of closed premises, the method involves using electromagnetic-radiation transformers (14) that modify the direction and the shape of said electromagnetic radiation according to the shape and the dimensions of the areas to be monitored.