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Abstract: This paper presents our research on the influence of metal plates on a radio frequency identification (RFID) loop antenna operating at 13.56 MHz. More specific we have tested different types of metal plates near a loop antenna in terms of resonance frequency. The performance of an RFID system strongly depends on the configuration of the antenna. The study shows that the resonance frequency will shift up in a metallic environment. Simulations were done, resulting in a better overview on the behavior of the magnetic field nearby metallic environments. Out of these results, a new antenna concept has been created. This new RFID loop antenna has remarkable good results in a metallic or changing environment. As an example, the new RFID loop antenna is designed in order to prove the increased stability.