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The adaptive array under directionally constrained minimization of power (DCMP) algorithm is improved by adding a "pseudonoise." It is effective to protect the desired signal from cancellation or distortion in such cases as 1) where a coberent interference is incident, or 2) where the desired signal direction for the constraint contains some pointing error, or 3) when the desired signal is broad band. The optimum amount of pseudonoise to be added is also discussed and its formula is given. This system is named "tamed adaptive antenna" since its killing capability is somewhat moderated so as not to hurt the desired signal.

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Abstract:The resonant mode of the wireless power transmission system is discussed to unveil a mechanism of wireless power transmission. We have analyzed electro-magnetic resonance phenomenon by using MoM to calculate input impedance, port currents, transmission efficiency, and near field distribution. We have checked that the system has two resonant frequencies, and the power transmission efficiency is maximized at those frequencies. The magnetic field distribution proves that the system has two different resonant modes. We have also considered far field to find that the higher frequency resonance is better for its high efficiency and low undesired emission.