High frequency circuit with variable phase shift
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United States of America Patent
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-
Jan 1, 2002
Grant Date -
N/A
app pub date -
Nov 8, 1999
filing date -
Nov 9, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To make a variable phase shifter at low cost and that is easy to manufacture, two propagation paths for a high frequency signal are provided in parallel between the input and the output of the phase shifter. These two paths are of different lengths. An intermediate node on one of the paths is connected to an intermediate node on the other path by a PIN diode. The diode is connected to the paths by a segment of line further enhancing the length difference. By biasing the diode to a desired level, it is caused to present a particular impedance to propagation. It is shown that by acting in this way the diode can vary the phase shift between the input and the output without needing to use harmful reactive components.
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