Simple Automatic Antenna Tuning System And Method
First Claim
1. A method for tuning the resonant frequency of an antenna in a wireless communication device, comprising the steps of:
- sensing the out-of-band impedance of the antenna, the antenna comprising an antenna element and a selectively adjustable impedance disposed between the antenna element and a ground plane of the wireless device; and
adjusting the selectively adjustable impedance to achieve a desired resonant frequency of the antenna.
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Accused Products
Abstract
Embodiments of a method for tuning the resonant frequency of an antenna in a wireless communication device are disclosed, along with embodiments of a wireless communication device using such a method. Embodiments sense the out-of-band impedance of the antenna, which comprises an antenna element and selectively adjustable impedance disposed between the antenna element and a ground plane of the wireless device, and adjust the selectively adjustable impedance to achieve a desired resonant frequency of the antenna. Embodiments separate an antenna signal into an in-band signal and out-of-band impedance, generate an error signal related to the out-of-band impedance, apply the error signal to a controller circuit configurable to generate an impedance error signal representing the change in antenna impedance, and apply the impedance error signal to the selectively adjustable impedance. Embodiments of a method and electronic circuit for determining the change in impedance of an antenna are also disclosed.
46 Citations
29 Claims
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1. A method for tuning the resonant frequency of an antenna in a wireless communication device, comprising the steps of:
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sensing the out-of-band impedance of the antenna, the antenna comprising an antenna element and a selectively adjustable impedance disposed between the antenna element and a ground plane of the wireless device; and adjusting the selectively adjustable impedance to achieve a desired resonant frequency of the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining the change in impedance of an antenna in a wireless communication device, comprising the steps of:
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separating an antenna signal into an in-band antenna signal and an out-of-band antenna impedance; generating an error signal related to the out-of-band antenna impedance; and applying the error signal to a controller circuit configurable to generate a signal representing the change in impedance of the antenna. - View Dependent Claims (13, 14, 15)
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16. An electronic circuit for determining the change in impedance of an antenna in a wireless communication device, comprising:
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a filter operably connected to the antenna; an oscillator operably connected to the filter, said oscillator capable of generating a frequency error signal related to a characteristic of a signal received from the filter; and a controller operably connected to the oscillator, said controller configurable to generate a signal related to the change in impedance of the antenna in proportion to the frequency error signal. - View Dependent Claims (17, 18, 19, 20)
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21. A wireless communication device comprising:
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a processor; an antenna; a wireless communication receiver; an antenna tuning circuit, comprising; a selectively adjustable impedance disposed between an element of the antenna and a ground plane of the wireless communication device; a filter operably connected to the antenna; an oscillator operably connected to the filter, said oscillator capable of generating a frequency error signal related to a characteristic of a signal received from the filter; and a controller operably connected to the oscillator, said controller configurable to generate an impedance error signal in proportion to the frequency error signal and to adjust the resonant frequency of the antenna to a desired resonant frequency by applying the impedance error signal to the selectively adjustable impedance; a memory comprising software code that enables the processor to configure the antenna tuning circuit. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification