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US 3,980,975 AGranted
Broadband microwave bias network
AssigneeVarian Associates, Inc.
InventorsThomas Gerald Maxon, Jr., James Francis Reynolds
Life of this patent
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AssigneeVarian Associates, Inc.
InventorsThomas Gerald Maxon, Jr., James Francis Reynolds
Estimating the term…
For supplying a bias (modulation) signal, either AC or DC, to a microwave circuit, a network consisting of a low pass filter is provided which presents a high isolating impedance to an extremely wide bandwidth of microwave frequencies, while allowing low frequency bias or modulating signals to be supplied to the microwave circuit without significant attenuation. The network consists of two helical inductors, one within the other, plus a bypass capacitor. The inner small inductor presents a high, non-resonant impedance to high microwave frequencies and the outer, larger inductor presents a high impedance to lower microwave frequencies. The bypass capacitor cooperates with the outer inductor to complete the filter circuit for the lower microwave frequencies. The smaller inductor's proximity to and within the larger inductor provides a distributed shunt capacitance to ground so as to terminate the filter for the higher microwave frequencies at the smaller inductor.
A broadband microwave bias network comprising a relatively large helical inductor, a relatively small helical inductor positioned within said large inductor so as to create a distributed capacitance between said inductors, and means connecting said inductors in series, said distributed capacitance and inductors forming a filter network for applying low frequency signals to a microwave circuit.
Dependencies are inferred from the claim text.