Plessey Overseas Limited

Siemens Plessey Electronic Systems Limited

Anthony A Lane

A circuit arrangement which includes a switched inductor comprises a spiral inductor and a MESFET coupled in parallel for switching the spiral inductor in and out of a circuit. The MESFET has at least two gates, at least one of which and at least one section of at least one turn of the spiral inductor, are all mounted adjacent to one another on an active mesa. The switched inductor thus enables parasitic capacitances to be reduced and saves space on the mesa.

Circuit arrangement comprising MESFET switched spiral inductor

The invention provides a phase-shifting device for inclusion into a microwave transmission line to effect a predetermined, constant, broadband shift in phase of transmitted signals. The device comprises, in its preferred form, two Gallium Arsenide field effect transistors, connected in parallel, serially included in the line, and means for switching the transistors between alternate states to effect the phase shift.

Growing community of inventors

Northampton, United Kingdom

Anthony A Lane