Wave transmission lines and networks – Attenuators
Reexamination Certificate
2007-04-10
2007-04-10
Jones, Stephen E. (Department: 2817)
Wave transmission lines and networks
Attenuators
C338S216000
Reexamination Certificate
active
10912726
ABSTRACT:
An absorptive temperature-variable microwave attenuator is produced using a first plurality of shunt resistors separated by quarter-wave transmission lines connected by a series resistor with a second plurality of shunt resistors separated by quarter-wave transmission lines. At least one or more of the resistors are temperature-variable resistors. The temperature coefficients of the temperature-variable resistors are selected so that the attenuator changes at a controlled rate with changes in temperature while attenuator remains relatively matched to the transmission line. In one embodiment, the resistors are thick-film resistors and a variety of temperature coefficients can be created for each resistor by properly selecting and mixing different inks when forming the thick film resistors. Furthermore, attenuators can be created having either a negative temperature coefficient of attenuation or a positive temperature coefficient of attenuation.
REFERENCES:
patent: 5332981 (1994-07-01), Mazzochette et al.
patent: 6081728 (2000-06-01), Stein et al.
patent: 2002208803 (2002-07-01), None
Jones Stephen E.
Morgan & Lewis & Bockius, LLP
Smith Interconnect Microwave Components, Inc.
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