Methods and apparatuses for adaptively controlling antenna parameters to enhance efficiency and maintain antenna size compactness
First Claim
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1. A communications apparatus capable of transmitting and receiving signals in a plurality of frequency bands, the communications apparatus comprising:
- an antenna controllable to at least two resonant frequencies;
a power amplifier for operating on an input signal to supply a first signal to the antenna for transmitting, a power-related parameter associated with the first signal, the power amplifier having an output power controllable responsive to the power-related parameter, wherein a power amplifier output impedance varies according to the output power;
the antenna comprising an active element for transmitting signals supplied by the power amplifier and for receiving signals;
the antenna further comprising controllable structural elements control over which determines the antenna input impedance and therefore the impedance into which the power amplifier operates, the structural elements controlled to increase a power amplifier efficiency; and
an antenna controller responsive to the power-related parameter, or to the power amplifier output power, or to the power amplifier output impedance for controlling the controllable structural elements and for establishing an antenna resonant frequency from among the at least two resonant frequencies.
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Abstract
An antenna for a communications device having configurable elements controlled to modify an antenna impedance and/or an antenna resonant frequency to improve performance of the communications device. The antenna impedance is controlled to substantially match to an output impedance of a power amplifier that supplies the antenna with a signal for transmission. The antenna resonant frequency is controlled to overcome the effects of various operating conditions that can detune the antenna or in response to an operable frequency band.
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Citations
15 Claims
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1. A communications apparatus capable of transmitting and receiving signals in a plurality of frequency bands, the communications apparatus comprising:
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an antenna controllable to at least two resonant frequencies; a power amplifier for operating on an input signal to supply a first signal to the antenna for transmitting, a power-related parameter associated with the first signal, the power amplifier having an output power controllable responsive to the power-related parameter, wherein a power amplifier output impedance varies according to the output power; the antenna comprising an active element for transmitting signals supplied by the power amplifier and for receiving signals; the antenna further comprising controllable structural elements control over which determines the antenna input impedance and therefore the impedance into which the power amplifier operates, the structural elements controlled to increase a power amplifier efficiency; and an antenna controller responsive to the power-related parameter, or to the power amplifier output power, or to the power amplifier output impedance for controlling the controllable structural elements and for establishing an antenna resonant frequency from among the at least two resonant frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for operating a communications apparatus capable of transmitting and receiving signals at a plurality of frequencies by an antenna the method comprising:
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receiving an input signal at a power amplifier, a power-related parameter associated with the input signal; processing the input signal in the power amplifier to generate a first signal, the power amplifier having an output power responsive to the power related parameter, wherein a power amplifier output impedance varies according to the output power; controlling an output power of the power amplifier responsive to the power-related parameter; controlling antenna structural elements that determine an antenna input impedance and therefore the impedance into which the power amplifier operates, the structural elements controlled to increase a power amplifier efficiency, wherein the antenna structural elements are controlled responsive to the power related parameter, or to the power amplifier output power or to the power amplifier output impedance; and controlling the antenna to determine a resonant frequency from among the plurality of frequencies. - View Dependent Claims (15)
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Specification