Transceiver with closed loop control of antenna tuning and power level
AssigneeJohnson Controls Technology Company
InventorsDavid Blaker, Matthew Cardwell, Paul Duckworth, Brian Honeck
Life of this patent
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Abstract
A trainable transceiver for learning and transmitting an activation signal that includes an RF carrier frequency modulated with a code for remotely actuating a device, such as a garage door opener. The trainable transceiver preferably includes a controller, a signal generator, and a dynamically tunable antenna having a variable impedance that may be selectively controlled in accordance with a detector circuit signal. The detector circuit provides a measurement of the transmission power and is also used to vary the applied transmission power of the transceiver in response to operating and environmental parameters.
Claims21
A transmitter for transmitting a device activation signal or other data, for remotely actuating a device, the device activation signal having an RF carrier frequency and a power level, said transmitter comprising:
- a controller operable in an operating mode or providing a tune level signal that identifies the RF carrier frequency of the device activation signal;
- a signal generator circuit coupled to the controller for generating the device activation signal, such that the RF carrier frequency corresponding to the controller tune level signal is generated;
- and
- a detector circuit for detecting the power level of the device activation signal, the detector circuit providing the detected power level to the controller.
A transmitter system for transmitting a device activation signal that includes an RF carrier frequency, modulation scheme, and data code for remotely actuating device, comprising:
- a controller operable in an operating mode for providing an output signal that identifies the frequency and code of the device activation signal;
- a signal generator circuit coupled to the controller for generating the device activation signal such that the RF carrier frequency and data code corresponding to the controller output signal are generated;
- a transmission antenna assembly, being coupled to the signal generator circuit for transmitting the device activation signal, the transmitted activation signal having a power output;
- and
- a detector circuit for detecting a power level representative of the transmitted activation signal power output, the detector circuit coupled to the controller for providing the detected power level.
A method of transmitting a device activation signal for remotely actuating a device, the device activation signal having an RF carrier frequency and a power level, comprising the steps of:
- providing a transmission antenna assembly having a tunable impedance;
- generating the RF carrier frequency;
- generating an antenna assembly tuning signal for controlling the antenna assembly impedance;
- transmitting the device activation signal;
- detecting the activation signal power level;
- and
- adjusting the antenna assembly tuning signal in response to the detected activation signal power level.
A transmitter for transmitting a device activation signal or other data, for remotely actuating a device, the device activation signal having an RF carrier frequency and a phase shift, said transmitter comprising:
- a controller operable in an operating mode or providing a tune level signal that identifies the RF carrier frequency of the device activation signal;
- a signal generator circuit coupled to the controller for generating the device activation signal, such that the RF carrier frequency corresponding to the controller tune level signal is generated;
- and
- a detector circuit for detecting the phase shift of the device activation signal, the detector circuit providing the detected phase shift to the controller.
Dependencies are inferred from the claim text.