HF frequency tuning device
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United States of America Patent
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-
Apr 26, 2011
Grant Date -
Aug 16, 2007
app pub date -
Feb 20, 2007
filing date -
May 18, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An HF frequency tuning device includes a resonance cavity in which an HF is introduced, a phase detecting section which generates a sign data representing a sign of a phase difference between a traveling wave and a reflected wave included in the HF in the resonance cavity. The frequency of the HF is repeatedly shifted by a first pitch. The direction of the shift is determined by the sign data for reducing the phase difference. When the sign is inverted, the frequency of the HF is repeatedly shifted to the opposite direction by a second pitch smaller than the first pitch until the sign is inverted again. By this tuning process, the fine tuning of HF can by achieved in a short time.
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