主权项 |
1. A wireless communications system, comprising:
an antenna; a matching circuit coupled to said antenna, said matching circuit having an operating frequency; a control system operable to calculate, in real-time, a value for an input impedance of the antenna, wherein said input impedance is calculated based on a first received power measurement corresponding to said matching circuit tuned at said operating frequency, a second received power measurement corresponding to said matching circuit tuned at a first perturbed frequency equal to the operating frequency minus a frequency perturbation step interval, and a third received power measurement corresponding to said matching circuit tuned at a second perturbed frequency equal to the operating frequency plus the frequency perturbation step interval. |