Transceiver with closed loop control of antenna tuning and...

Details Transceiver with closed loop control of antenna tuning and... Transceiver with closed loop control of antenna tuning and...

2005-12-19

2008-12-23

Jackson, Blane J. (Department: 2618)

Telecommunications

Transmitter

With variation of antenna impedance or dimension for modulation

C455S115200, C455S123000

Reexamination Certificate

active

07469129

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.

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