Maureen Marsha Daly

US Patent:

53493125, Sep 20, 1994

Filed:

May 28, 1993

Appl. No.:

8/068911

Inventors:

Steven E. Huettner - Billerica MA
Maureen A. Daly - Pelham NH
Derek J. Fitzgerald - Lincoln MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01P 122

US Classification:

333 81A

Abstract:

A voltage variable attenuator is described including a quadrature hybrid coupler having an input port, an output port, a first reflective port and a second reflective port. The voltage variable attenuator further includes a first and a second impedance network, the first impedance network connected to the first reflective port of the quadrature hybrid coupler, the second impedance network connected to the second reflective port of the quadrature hybrid coupler, each impedance network including a first RF propagation network having a first end connected to the respective reflective port of the quadrature hybrid coupler. Each impedance network further includes a second end of the first RF propagation network connected to a field effect transistor having a drain electrode, a source electrode and a gate electrode, the drain electrode connected to the second end of the first RF propagation network. Completing each impedance network is a second RF propagation network having a first end connected to the source electrode and a second electrode connected to a ground through a plated via hole.