Adaptive impedance matching
First Claim
Patent Images
1. A communication device, comprising:
- a memory;
a matching network including one or more variable reactance elements; and
a controller coupled with the matching network and the memory,wherein the controller adjusts the one or more variable reactance elements to perform first tuning responsive to a first variable load impedance,wherein the first tuning is iterative and is initiated using a first initial tuning configuration for the one or more variable reactance elements that is selected from a look-up table based on a first physical use state of the communication device and an operating frequency without being selected according to any other parameter identified in the look-up table,wherein the first tuning subsequently utilizes first measured operational parameters for first subsequent tuning values for the one or more variable reactance elements, andwherein the first tuning is limited to avoid certain matching impedance values to ensure that a specific absorption rate limit is not exceeded.
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Abstract
An embodiment of the present invention provides a method for limiting tuning of a matching network having variable reactive elements coupled to a variable load impedance to at least reduce an undesirable effect caused by an RF signal. Other embodiments are disclosed.
500 Citations
20 Claims
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1. A communication device, comprising:
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a memory; a matching network including one or more variable reactance elements; and a controller coupled with the matching network and the memory, wherein the controller adjusts the one or more variable reactance elements to perform first tuning responsive to a first variable load impedance, wherein the first tuning is iterative and is initiated using a first initial tuning configuration for the one or more variable reactance elements that is selected from a look-up table based on a first physical use state of the communication device and an operating frequency without being selected according to any other parameter identified in the look-up table, wherein the first tuning subsequently utilizes first measured operational parameters for first subsequent tuning values for the one or more variable reactance elements, and wherein the first tuning is limited to avoid certain matching impedance values to ensure that a specific absorption rate limit is not exceeded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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determining, by a system including a processor, tuning steps for a matching network of a communication device to perform tuning responsive to a variable load impedance; determining, by the system, a physical use state for operation of the communication device; monitoring, by the system, for the operation of the communication device at a pre-determined power level; identifying, by the system, a prohibited matching impedance range based on specific absorption rate limits, the pre-determined power level and the physical use state; generating, by the system, limited tuning steps by adjusting the tuning steps to include a default limit utilizing an iterative process; and adjusting, by the system, one or more variable reactance elements of the matching network based on the limited tuning steps for the tuning, wherein the tuning is initiated using initial tuning values for the one or more variable reactance elements that are selected from a set of pre-defined initial tuning configuration based only on the physical use state of the communication device and an operation frequency, and wherein the tuning avoids setting the one or more variable reactance elements within the prohibited matching impedance range. - View Dependent Claims (11, 12, 13)
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14. A communication device, comprising:
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a matching network including one or more variable reactance elements; and a controller coupled with the matching network, wherein the controller adjusts the one or more variable reactance elements to perform first tuning responsive to a first variable load impedance, wherein the first tuning is iterative and is initiated using first initial tuning values for the one or more variable reactance elements based on a selection from among a group of pre-defined initial configurations, wherein the selection performed by the controller is based only on a physical use state of the communication device and an operating frequency wherein the first tuning subsequently utilizes first measured operational parameters for first subsequent tuning values for the one or more variable reactance elements for the first tuning, and wherein the first tuning is limited by prohibited matching impedance values for tuning steps to ensure that a specific absorption rate limit is not exceeded. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification