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US 12,646,847 B2Granted
Antenna system with quality-factor modulation
AssigneeWisconsin Alumni Research Foundation
InventorsDaniel Ludois, Nader Behdad, Marisa Liben, Mirhamed Mirmozafari
Life of this patent
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Abstract
An electrically small antenna system modulates the Q factor of the antenna during electrical transmission to decrease the Q factor during signal transitions between frequency states thereby affecting an improved trade-off between antenna bandwidth and operating efficiency.
Claims15
An electrically small antenna system for use with a digitally modulated radio, the system comprising:
- an antenna output adapted to connect to and control a current through an antenna radiator;
- a radio signal input receiving a radiofrequency signal being a function of an encoding signal defining a series of digital symbols transmitted at symbol times separated at transition times;
- an antenna driver circuit operating to apply power to a connected antenna radiator during symbol times and to dissipate power from the antenna radiator during transition times by changing an effective resistance in a path through the antenna radiator to lower an electrical quality factor (Q) of the connected antenna driver circuit and antenna radiator;
- and
- wherein the changing of the effective resistance is synchronized with a transition between digital symbols to lower the electrical Q for at least a portion of that transition and less than an entire symbol time.
2 more elements
An electrically small antenna system for use with a digitally modulated radio, the system comprising:
- an antenna output adapted to connect to and control a current through an antenna radiator;
- a radio signal input receiving a radiofrequency signal being a function of an encoding signal defining a series of digital symbols transmitted at symbol times separated at transition times;
- an antenna driver circuit operating to apply power to a connected antenna radiator during symbol times and to dissipate power from the antenna radiator during transition times by changing an effective resistance in a path through the antenna radiator to lower an electrical quality factor (Q) of the connected antenna driver circuit and antenna radiator;
- and
- wherein the effective resistance is provided by an amplifier communicating with a current monitor monitoring current through the antenna radiator, and operating during transition times to provide an output voltage that changes as a function of the monitored current to dissipate power in the antenna radiator.
2 more elements
Dependencies are inferred from the claim text.