Detecting proximity using antenna feedback
First Claim
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1. A method comprising:
- detecting a change in a voltage standing wave ratio (VSWR) between a radio frequency (RF) transmitter and an RF antenna relative to a predetermined VSWR baseline; and
identifying an applicable VSWR condition of a plurality of predefined VSWR conditions corresponding to various signal transmission frequencies, each of the predefined VSWR conditions indicative of a VSWR observable at a corresponding one of the various signal transmission frequencies when a conductive body is not within a threshold proximity of the RF antenna; and
adjusting transmission power of a carrier wave transmitted from the RF transmitter, if the change fails to satisfy the applicable VSWR condition.
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Abstract
An electronic device provides a detuning monitor circuit configured to detect a change in a voltage standing wave ratio (VSWR) between a radio frequency (RF) transmitter and an RF antenna relative to a predetermined VSWR baseline and a proximity detector circuit configured to adjust transmission power of a carrier wave transmitted from the RF transmitter, if the change fails to satisfy an acceptable VSWR condition. Network proximity detectors are also provided to allow coordination of antenna subsystems to comply with specific absorption rate (SAR) constraints and/or maintain/improve antenna performance.
214 Citations
20 Claims
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1. A method comprising:
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detecting a change in a voltage standing wave ratio (VSWR) between a radio frequency (RF) transmitter and an RF antenna relative to a predetermined VSWR baseline; and identifying an applicable VSWR condition of a plurality of predefined VSWR conditions corresponding to various signal transmission frequencies, each of the predefined VSWR conditions indicative of a VSWR observable at a corresponding one of the various signal transmission frequencies when a conductive body is not within a threshold proximity of the RF antenna; and adjusting transmission power of a carrier wave transmitted from the RF transmitter, if the change fails to satisfy the applicable VSWR condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic device comprising:
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a detuning monitor circuit configured to detect a change in a voltage standing wave ratio (VSWR) between a radio frequency (RF) transmitter and an RF antenna relative to a predetermined VSWR baseline; and a proximity detector circuit configured to identify an applicable VSWR condition of a plurality of predefined VSWR conditions corresponding to various signal transmission frequencies each indicative of a VSWR observable at a corresponding one of the various signal transmission frequencies when a conductive body is not within a threshold proximity of the RF antenna, wherein the proximity detector circuit is further configured to adjust transmission power of a carrier wave transmitted from the RF transmitter, if the change fails to satisfy the applicable VSWR condition. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An electronic device comprising:
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a radio frequency (RF) transmitter; an RF antenna; a detuning monitor circuit configured to detect a change in a voltage standing wave ratio (VSWR) between the RF transmitter and the RF antenna relative to a predetermined VSWR baseline; and a proximity detector circuit configured to identify an applicable VSWR condition of a plurality of predefined VSWR conditions corresponding to various signal transmission frequencies each indicative of a VSWR observable at a corresponding one of the various signal transmission frequencies when a conductive body is not within a threshold proximity of the RF antenna, and wherein the proximity detector circuit is further configured to adjust transmission power of a carrier wave transmitted from the RF transmitter, if the change fails to satisfy the applicable VSWR condition. - View Dependent Claims (19, 20)
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Specification