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US 5,345,199 AGranted
Non-reflective limiter
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsChance M. Glenn, Sr., Roger Kaul, David Sumner, Kisha N. Gwyn
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Abstract
A passive RF limiting circuit device providing protection for receiver front ends and the like by utilizing PIN diodes acting as switching devices which transform a low-loss T-network attenuator circuit into a high-loss .pi.-network attenuator circuit under high power conditions.
Claims6
A passive limiting device comprising:
- an input port,
- a first end of a first resistance connected to said input port,
- an inductance element connected between the second end of said first resistance and an output port,
- a second resistance connected between the second end of said first resistance and a ground reference,
- a third resistance connected in series with a first pair of diodes connected anode to cathode in parallel, said third resistance in series with said first pair of diodes being connected between said output port and said ground reference,
- a fourth resistance in series with a second pair of diodes connected anode to cathode in parallel, said fourth resistance and said second pair of diodes being connected in parallel across said second resistance,
- a third pair of diodes connected anode to cathode in parallel, said third pair of diodes being connected in series with a capacitance, and wherein said third pair of diodes in series with said capacitance is connected in parallel with said inductance,
- a fourth pair of diodes connected anode to cathode in parallel, said fourth pair of diodes being connected in parallel with said first resistance, wherein
- when said first, second, third, and fourth pairs of diodes are open circuited, said passive limiting device comprises a low-loss T-network attenuator circuit, and when said first, second, third, and fourth pairs of diodes are conducting, said passive limiting device comprises a high-loss .pi.-network attenuator circuit.
6 more elements
Dependencies are inferred from the claim text.