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Method and apparatus for maintaining constant antenna resonant frequency and impedance matching using variable reactance antenna aperture tuning in the presence of environmental changes and head / hand effects
Method and apparatus for maintaining constant antenna resonant frequency and impedance matching using variable reactance antenna aperture tuning in the presence of environmental changes and head / hand effects
The present invention relates generally to any device capable of wireless communication, such as a mobile phone or a wearable device, having one or more antennas. By applying a variable reactance (capacitive or inductive) antenna tuner to a simple scalar antenna aperture tuning system, it is possible to maintain a constant antenna resonance frequency in the presence of environmental or head / hand effects. . The variable reactance is used to adjust the resonant frequency of the antenna to be maintained at the desired target frequency, corresponding to external variables that can change the resonant frequency of the antenna away from the operating frequency of the device. By adjusting the resonance frequency of the antenna in response to the externally induced change, it is possible to maintain the radiation efficiency of the antenna and at the same time to prevent impedance mismatch between the respective transmission / reception paths in the antenna and the radio unit, have.
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