Wave transmission lines and networks – Attenuators
Reexamination Certificate
2007-08-14
2007-08-14
Jones, Stephen E. (Department: 2817)
Wave transmission lines and networks
Attenuators
Reexamination Certificate
active
11107586
ABSTRACT:
A preferred embodiment of the present invention comprises at least first and second thermistors, arranged into a classical Tee, Pi, or Bridged Tee attenuator design, a heating element, a temperature sensor, and a control circuit. The thermistors have different temperature coefficients of resistance and are in close proximity to the heating element and the temperature sensor. The control circuit receives a voltage signal from the temperature sensor, compares that signal with a voltage signal specifying a desired temperature, and applies electrical energy to the heating element until receiving a signal from the temperature sensor that the temperature of the thermistors matches the desired temperature. As a result, the attenuation of the attenuator can be changed at a controlled rate by varying the temperature of the thermistors, while the impedance of the attenuator remains within acceptable levels.
REFERENCES:
patent: 4340780 (1982-07-01), Odlen
patent: 5999064 (1999-12-01), Blacka et al.
Blacka Robert J.
Roldan Nelson
Jones Stephen E.
Morgan & Lewis & Bockius, LLP
Smiths Interconnect Microwave Components, Inc.
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