Low loss, broadband switchable microwave step attenuator

Details Low loss, broadband switchable microwave step attenuator Low loss, broadband switchable microwave step attenuator

1975-10-17

1977-03-01

Gensler, Paul L.

Wave transmission lines and networks

Attenuators

333 84M, H01P 122

Patent

active

040104303

ABSTRACT:
A printed rf circuit switchable step attenuator for frequencies in the Gigahertz range employs PIN diodes for switching a pi network in and out of a transmission line. The A.C. grounded terminations of the pi network are constructed through the use of low impedance, open end stubs, eliminating the need for plated over-edge ground connections. D.C. bias potential for controlling the switching diodes is coupled to the rf portion of the circuit by means including high impedance grounded stub conductors connected to the transmission line. To achieve broadband operation the admittance of the stub conductors is tuned out by configuring the transmission line as a series of differing line length and impedance sections which are arranged symmetrically with respect to the point of intersection between the grounded stub conductors and the line.

REFERENCES:
patent: 3518585 (1970-06-01), Wilcox
patent: 3529266 (1970-09-01), King
patent: 3774123 (1973-11-01), Hume
patent: 3775708 (1973-11-01), Sly

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