In recent years, RFID technology and its applications have substantially increased in importance, mainly due to expanding use of contactless chip cards in payment and government identification sectors. These cards rely on the principles of resonant circuits and inductive coupling, making resonance frequency an important parameter for their development and verification. The currently established method for measuring resonance frequency is performed on a vector network analyzer and it features certain disadvantages with respect to accuracy and objectivity of the measurement. A new method for measuring resonance frequency is presented in this thesis. This method gives a more accurate definition of resonance frequency, removes any subjectivity, and makes the measurement integrable into standardized test setups. The method utilizes signal processing and system modeling to determine the maximum active power over a range of frequencies in the chip card. This is achieved by applying a transfer function obtained from the model and by using a so-called chirp signal as input to the system. The determined maximum of active power is mapped to the corresponding frequency in the chirp signal, which is defined as the new resonance frequency. Feasibility of the new method is confirmed by simulations, as well as by comparing measurement results with the currently established method. The results show that the new method offers significant advantages over the vector network analyzer method.