ENHANCED MAGNETIC FIELD COMMUNICATION SYSTEM
First Claim
1. A method, comprising:
- receiving a first signal induced in an antenna element, comprising;
shielding the antenna element from electric fields; and
controlling an input impedance switch to provide a differential amplifier with a first input impedance; and
transmitting a second signal, including;
controlling the input impedance switch to provide the differential amplifier with second input impedance larger than the first input impedance; and
driving the first signal through the antenna element.
1 Assignment
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Accused Products
Abstract
Devices and methods are provided to enhance magnetic field communication. One aspect of the present subject matter relates to a method for transmitting and receiving signals using an antenna element electrically connected to a driver and an amplifier. According to various embodiments of the method, a first signal is transmitted from the antenna element and a second signal that was induced in the antenna element is received. Transmitting the first signal includes driving the first signal through the antenna element using the driver, and monitoring the first signal through an input impedance of the amplifier. Receiving the second signal includes reducing the input impedance of the amplifier, and receiving the second signal at the amplifier through the reduced input impedance. Various embodiments shield the antenna element from electric and electromagnetic fields. Other aspects are provided herein.
45 Citations
20 Claims
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1. A method, comprising:
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receiving a first signal induced in an antenna element, comprising; shielding the antenna element from electric fields; and controlling an input impedance switch to provide a differential amplifier with a first input impedance; and transmitting a second signal, including; controlling the input impedance switch to provide the differential amplifier with second input impedance larger than the first input impedance; and driving the first signal through the antenna element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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monitoring an RF input to detect an RF carrier signal; receiving a first signal induced in an antenna element when an RF carrier signal is not detected, comprising; shielding the antenna element from electric fields; and controlling an input impedance switch to provide a differential amplifier with a first input impedance; and transmitting a second signal in response to a detected RF carrier signal, including; controlling the input impedance switch to provide the differential amplifier with second input impedance larger than the first input impedance; and driving the first signal through the antenna element, wherein controlling the input impedance switch includes selectively removing at least one element from an input impedance network for the differential amplifier. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method, comprising:
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receiving a first signal induced in an antenna element, comprising; shielding the antenna element from electric fields using an electrostatic conductor surrounding a coil of the antenna element or an electrostatic conductor strip extending a length of the antenna element; and controlling an input impedance switch to provide a differential amplifier with a first input impedance; transmitting a second signal, including; controlling the input impedance switch to provide the differential amplifier with second input impedance larger than the first input impedance; and driving the first signal through the antenna element; and monitoring a transmission of the second signal using the differential amplifier and the second input impedance. - View Dependent Claims (19, 20)
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Specification