ANTENNA RESONANCE FREQUENCY CONTROL DRIVER
First Claim
1. An antenna control circuit comprising:
- an H-bridge circuit including three half-bridge circuits; and
a controller configured to control the H-bridge circuit;
wherein a first half-bridge circuit and a second half-bridge circuit of the three half-bridge circuits are configured to electrically connect across a resonant antenna with a first resonant frequency and a second resonant frequency;
wherein a third half-bridge circuit is configured to electrically connect to a first capacitance connected to the resonant antenna, wherein the controller is configured to control the third half-bridge circuit to switch the connection of the first capacitance to the resonant antenna to a first position that changes the resonant frequency of the resonant antenna to the first resonant frequency.
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Accused Products
Abstract
An antenna control circuit including: an H-bridge circuit including three half-bridge circuits; and a controller configured to control the H-bridge circuit; wherein a first half-bridge circuit and a second half-bridge circuit of the three half-bridge circuits are configured to electrically connect across a resonant antenna with a first resonant frequency and a second resonant frequency; wherein a third half-bridge circuit is configured to electrically connect to a first capacitance connected to the resonant antenna, wherein the controller is configured to control the third half-bridge circuit to switch the connection of the first capacitance to the resonant antenna to a first position that changes the resonant frequency of the resonant antenna to the first resonant frequency.
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Citations
16 Claims
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1. An antenna control circuit comprising:
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an H-bridge circuit including three half-bridge circuits; and a controller configured to control the H-bridge circuit; wherein a first half-bridge circuit and a second half-bridge circuit of the three half-bridge circuits are configured to electrically connect across a resonant antenna with a first resonant frequency and a second resonant frequency; wherein a third half-bridge circuit is configured to electrically connect to a first capacitance connected to the resonant antenna, wherein the controller is configured to control the third half-bridge circuit to switch the connection of the first capacitance to the resonant antenna to a first position that changes the resonant frequency of the resonant antenna to the first resonant frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An multi-frequency antenna system comprising:
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a resonant antenna including a first port, second port, third port, an inductor coil, a first capacitor in parallel to the inductor coil between the first port and the second port, and a second capacitor connected between the first port and the third port; an H-bridge circuit including first, second, and third half-bridge circuits connected between an input/output and ground, wherein a first half-bridge circuit is connected to the first port, the second half-bridge circuit is connected to the second port, and the third half-bridge circuit is connected to the third port; and a controller configured to control the H-bridge circuit; wherein the controller is configured to control the first half-bridge and the second half-bridge so that the first and third ports are connected together so that the resonant antenna has a first resonant frequency; and wherein the controller is configured to control the second half-bridge and the third half-bridge so that the second and third ports are connected together so that the resonant antenna has a second resonant frequency. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of tuning a multi-frequency resonant antenna including an inductor coil, a first capacitor, and a second capacitor comprising:
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providing a first control signal to a first half-bridge and a second half-bridge of a H-bridge circuit so that the first capacitor is in series with an input/output of the multi-frequency resonant antenna resulting in a first resonant frequency; and providing a second control signal to the second half-bridge and a third half-bridge of the H-bridge circuit so that the first capacitor is in parallel with the second capacitor resulting in a second resonant frequency.
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Specification