Abstract: The invention relates to signal conversion devices to be used for the receiving radio devices. The attained technical result is the detection and conversion of signals in an electrical two-terminal device, a data loss level being minimal.

Abstract: A radio technology can be used for developing compact antenna assemblies for various uses. The compact antenna assembly includes and oscillatory circuit including a reactive component (8) and an inductance coil. The reactive component (8) is embodied in the form of a condenser provided with a pair of metallic plates (11). A space between the plates is filled with a material (9) containing particles (10) of conducting material separated by a dielectric filling material. The distance between the plated (11) is chosen such that it is less than &lgr;/4, where &lgr; is wave length actuating signals.