Wave transmission lines and networks – Attenuators
Patent
1984-05-17
1986-11-04
LaRoche, Eugene R.
Wave transmission lines and networks
Attenuators
307540, 307565, H03H 725, H01P 122
Patent
active
046212442
ABSTRACT:
The present invention relates to a broadband variable attenuator comprising a two- or three-section transmission line with a separate PIN diode bridging each of the two gaps between the adjacent ends of the transmission line sections. The two PIN diodes are disposed in series opposition and the first, second and third transmission line sections are connected to a diode variable biasing source to cause (a) substantially a total reflection of an input signal to the attenuator for a bias below a first value, (b) substantially a total transmission of an input signal through the diodes for a bias above a second value, and (c) a selected amount of both partial reflection and partial transmission of an input signal for a bias value between the first and second values. The broadband variable attenuator can be implemented using microstrip, stripline or coaxial technology without the need of d-c isolation capacitors or applique resistors while providing a maximum insertion loss under zero bias conditions.
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AT&T Bell Laboratories
LaRoche Eugene R.
Lee B.
Pfeifle Erwin W.
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