APPARATUS FOR VERIFYING THE CONTENTS BASED WATERMARKING OF MULTIMEDIA DATA AND METHOD THEREOF

摘要

The present invention relates to an arrangement (10) for coupling electro magnetic waves, particularly microwaves into and/or out of a device which comprises a dielectric resonator having a non-linear dielectric substrate with a high dielectric constant and a coupling loop (14). The dimensions of the resonator and the coupling loop (14) are correlated to the resonant frequency of the resonator and the coupling loop (14) is so arranged in relation to the resonator that the magnetic field line around the coupling loop match the internal film distribution of at least one mode, which has been selected to be excited, so that only said at least one mode is excited. Coupling is provided only for such mode. The length of the coupling loop (14) is comparable to or larger than the dimensions of the resonator.