Electronic device having coupler for tapping antenna signals
First Claim
1. Apparatus, comprising:
- an antenna;
radio-frequency transceiver circuitry that transmits radio-frequency signals at a transmit power level using the antenna;
a coupler interposed in a path between the radio-frequency transceiver circuitry and the antenna that taps, from the path, the radio-frequency signals transmitted by the radio-frequency transceiver circuitry;
a tapped signal path that carries the tapped radio-frequency signals from the coupler; and
a processor coupled to the tapped signal path that processes the tapped radio-frequency signals from the coupler to produce impedance information, wherein the coupler comprises switching circuitry and the processor is configured to direct the switching circuitry to route the tapped radio-frequency signals from the coupler to the tapped signal path.
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Accused Products
Abstract
An electronic device may be provided with wireless circuitry. Control circuitry may be used to adjust transmit power levels for wireless signals, may be used to tune antennas, and may be used to adjust other settings for the wireless circuitry. The electronic device may have a coupler interposed between an antenna and wireless transceiver circuitry. The coupler and a receiver within the transceiver circuitry may be used to make measurements on tapped antenna signals such as transmitted signals and signals reflected from the antenna. By analyzing the tapped antenna signals, S-parameter phase and magnitude information may be gathered that provides insight into whether the electronic device is operating properly and whether an external object is adjacent to the antenna. If an external object is present, the electronic device may limit wireless transmit power and may adjust tunable components in the antenna to compensate for detuning from the external object.
156 Citations
20 Claims
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1. Apparatus, comprising:
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an antenna; radio-frequency transceiver circuitry that transmits radio-frequency signals at a transmit power level using the antenna; a coupler interposed in a path between the radio-frequency transceiver circuitry and the antenna that taps, from the path, the radio-frequency signals transmitted by the radio-frequency transceiver circuitry; a tapped signal path that carries the tapped radio-frequency signals from the coupler; and a processor coupled to the tapped signal path that processes the tapped radio-frequency signals from the coupler to produce impedance information, wherein the coupler comprises switching circuitry and the processor is configured to direct the switching circuitry to route the tapped radio-frequency signals from the coupler to the tapped signal path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus, comprising:
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an antenna; radio-frequency transceiver circuitry that transmits radio-frequency signals using the antenna; an amplifier coupled between the radio-frequency transceiver circuitry and the antenna; a coupler interposed in a path between the amplifier and the antenna that taps, from the path, the radio-frequency signals transmitted by the radio-frequency transceiver circuitry; a tapped signal path that carries the tapped radio-frequency signals from the coupler; and a processor coupled to the tapped signal path that processes the tapped radio-frequency signals from the coupler to produce impedance information, wherein the processor is configured to control the amplifier to adjust a transmit power level of the radio-frequency signals transmitted by the radio-frequency transceiver circuitry based on a phase mismatch in the impedance information. - View Dependent Claims (14, 15, 16, 17, 18)
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19. Apparatus, comprising:
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an antenna; a radio-frequency transmitter that transmits radio-frequency signals over the antenna; a coupler interposed in a path between the radio-frequency transmitter and the antenna that taps, from the path, the radio-frequency signals transmitted by the radio-frequency transmitter; a tapped signal path that carries the tapped radio-frequency signals from the coupler; and a processor coupled to the tapped signal path that processes the tapped radio-frequency signals from the coupler, wherein the processor is configured to provide a control signal to the coupler via a control path. - View Dependent Claims (20)
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Specification