Wave transmission lines and networks – Coupling networks – Time domain filters
Patent
1979-12-17
1981-09-22
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Time domain filters
333138, 333156, 333202, H03H 1500, H01P 1201
Patent
active
042912865
ABSTRACT:
A high bandwidth transversal filter is described having an input impedance matching network, a tapped delay line, a plurality of weighting amplifiers, a distributed summing circuit, and an output impedance matching network. The delay line is implemented with a transmission line. The input impedance of this transversal filter depends on the inductance and capacitance of the transmission line and the capacitance of the inputs of each of the FET's used as weighting amplifiers. The gates of the FET's provide high impedance low loss taps of the delay line. The weighting is accomplished by either varying the drain current of the FET's or by using capacitive voltage dividers to apportion the tapped signals. The resulting weighted signals are applied to a distributed summing circuit which provides both high bandwidth summing and additional delays. This summer is also implemented with a tapped transmission line. The output impedance of this transversal filter depends on the inductance and capacitance of the summing line and the capacitance of the output of each FET. The parameters of the transmission lines constituting the input delay line and the distributed summer can be selected to provide broadband impedance matching for the input and output of the filter. The FET's thus act as high impedance taps, as weighting amplifiers, and as part of the input and output impedance matching networks.
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Ford Aerospace & Communications Corporation
Huang Alan
Nussbaum Marvin L.
Radlo Edward J.
Sadler Clifford L.
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