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US 2002/0153967 A1Published application
Variable phase shifter with reduced frequency-dependent phase deviations
AssigneeNEC Corporation
InventorKuniyoshi Nakada
Life of this patent
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Abstract
A variable phase circuit for microwave and millimeter wave applications includes a distributed-constant transmission line, a number of phase shifters respectively responsive to control signals for introducing a desired amount of phase shift to and removing the introduced phase shift from the transmission line. In order to compensate for the frequency-dependent phase deviation of each phase shifter, one or more loading stubs are selectively connected to or disconnected from the transmission line according to operation of the phase shifters.
Claims15
A variable phase circuit comprising:
- a transmission line;
- a phase shifter for introducing a phase shift to and removing the phase shift from said transmission line;
- an open-ended loading stub;
- and
- a switch for connecting the open-ended loading stub to and disconnecting the loading stub from said transmission line according to operation of said phase shifter.
2 more elements
A variable phase circuit comprising:
- a transmission line;
- a plurality of phase shifters respectively responsive to control signals for introducing one of a plurality of different phase shifts to and removing the introduced phase shift from said transmission line;
- a plurality of loading stubs;
- and
- a plurality of switches for selectively connecting said loading stubs to and disconnecting the loading stubs from said transmission line according to operation of said variable phase shifters.
2 more elements
Dependencies are inferred from the claim text.