Publication Type:Conference Paper
Source:Integrated Ferroelectrics, Volume 34, Number 1-4, p.1605/165-1616/176 (2001)
Keywords:alumina, annealing, Antenna phased arrays, Barium compounds, Ferroelectric microwave devices, Ferroelectric thin films, Growth (materials), Manganese, Microwave devices, Oscillators (electronic), Permittivity, Phase shifters, Radio communication, RF communications, sapphire, Tunable filters, Tunable microwave components, Tunable oscillators
The performance of proof-of-concept ferroelectric microwave devices has been moving steadily closer to the level needed for satellite and other rf communications applications. This paper will review recent progress at NASA Glenn in developing thin film BaxSr1-xTiO3 tunable microwave components for these applications. Phase shifters for phased array antennas, tunable filters and tunable oscillators employing microstrip and coupled microstrip configurations will be presented. Tunabilities, maximum dielectric constants, and phase shifter parameters will be discussed (e.g., coupled microstrip phase shifters with phase shift over 200° at 18 GHz and a figure of merit of 74.3°/dB). Issues of post-annealing, Mn-doping and BaxSr1-xTiO3 growth on sapphire and alumina substrates will be covered. The challenges of incorporating these devices into larger systems, such as yield, variability in phase shift and insertion loss, and protective coatings will also be addressed.
cited By 25