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US 5,301,358 AGranted
Automatic antenna tuning method and apparatus
AssigneesSeiko Corp., Seiko Epson Corporation
InventorsGarold B. Gaskill, Larry H. Mukai
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AssigneesSeiko Corp., Seiko Epson Corporation
InventorsGarold B. Gaskill, Larry H. Mukai
Estimating the term…
A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control signal is applied to a variable tuning element in the matching network, such as a varactor diode, and is swept from a minimum value to a maximum value. This sweeping is desirably performed in discrete voltage steps that correspond to unit increments of varactor capacitance. A feedback signal from the receiver, such as an AGC signal, is monitored during this operation to note which varactor bias signal yields the maximum AGC signal. After the sweep is concluded, the apparatus applies to the varactor the bias voltage that yielded the maximum AGC signal during the sweeping operation. This bias voltage is maintained through the end of the listening interval. At the beginning of the next listening interval, the process may be repeated.
A periodically active antenna for periodically receiving packets of information, comprising:
In combination,
In a method of operating an antenna system that is operative during recurrent time slots to receive a paging signal, said antenna system including an antenna tuning circuit,
Dependencies are inferred from the claim text.