Variable resistance attenuator

Details Variable resistance attenuator Variable resistance attenuator

1978-12-22

1980-08-05

Gensler, Paul L.

Wave transmission lines and networks

Attenuators

333109, H01P 122

Patent

active

042164451

ABSTRACT:
Four PIN diodes are connected, two in parallel oppositely directed at each f two ports of a 3 dB, quadrature hybrid which equally divide the power from an input port. The mismatch produced by the PIN diode resistance in parallel with the matching load resistance reflects part of the power, which combines at the two ports and exits at a fourth port of the hybrid. Direct-current bias to the PIN diodes is adjusted to vary the attenuation. There is also variable resistance and capacitance which serves as variable adjustments on the terminations of the hybrid when the diodes are unbiased.

REFERENCES:
patent: 3202942 (1965-08-01), Garver et al.
patent: 3443249 (1969-05-01), Ashley
patent: 3673492 (1972-06-01), Gilson
patent: 3943467 (1976-03-01), Yamada et al.

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