A method for compensating phase offset caused by a matching network and antenna of a near field communication (NFC) communications device , the method comprising: generating a mapping that correlates phase offset with a characteristic parameter; measuring the characteristic parameter for the communications device ; using the measured characteristic parameter and the mapping to determine a phase offset for the communications device ; and using the determined phase offset to compensate for the phase offset caused by the matching network and antenna of the communications device , wherein the mapping that correlates phase offset with the characteristic parameter is stored as a mapping table, wherein the mapping that correlates phase offset with the characteristic parameter is generated by measuring or analyzing in simulation the phase offset by sweeping temperature of a component, a printed circuit board (PCB), and/or the antenna ; wherein the characteristic parameter is associated with a signal that is either received or transmitted by the communications device ; wherein the characteristic parameter is comprising a combination of at least two of the following features: a resonance peak frequency for the signal, an amplitude peak of the frequency response for the signal, an amplitude or a combination of amplitudes at specific frequencies for the signal, a notch of the frequency response for the signal, a bandwidth of the matching network and antenna , a specific shape of the frequency response for the signal. generating a mapping that correlates phase offset with a characteristic parameter; measuring the characteristic parameter for the communications device ; using the measured characteristic parameter and the mapping to determine a phase offset for the communications device ; and using the determined phase offset to compensate for the phase offset caused by the matching network and antenna of the communications device , wherein the mapping that correlates phase offset with the characteristic parameter is stored as a mapping table, wherein the mapping that correlates phase offset with the characteristic parameter is generated by measuring or analyzing in simulation the phase offset by sweeping temperature of a component, a printed circuit board (PCB), and/or the antenna ; wherein the characteristic parameter is associated with a signal that is either received or transmitted by the communications device ; wherein the characteristic parameter is comprising a combination of at least two of the following features: a resonance peak frequency for the signal, an amplitude peak of the frequency response for the signal, an amplitude or a combination of amplitudes at specific frequencies for the signal, a notch of the frequency response for the signal, a bandwidth of the matching network and antenna , a specific shape of the frequency response for the signal. a resonance peak frequency for the signal, an amplitude peak of the frequency response for the signal, an amplitude or a combination of amplitudes at specific frequencies for the signal, a notch of the frequency response for the signal, a bandwidth of the matching network and antenna , a specific shape of the frequency response for the signal. <EOS>