In this paper, a novel way of using reverberation chambers (RCs) is proposed. The feasibility of coherent deterministic cylindrical wavefronts generation inside RCs is investigated by applying the time reversal technique on electromagnetic waves. To achieve that, we designed a new radiated-immunity testing tool called a time-reversal electromagnetic chamber (TREC) to generate coherent wavefronts towards equipment-under-test (EUT). High field strength levels are achieved as we focus the energy on a small volume around the EUT. The quality of a cylindrical wavefront converging towards a EUT is evaluated for different configurations of the TREC system.