Scientists at Novgorod State University (NovSU) have identified the materials and geometry required for efficient electrical tuning of microwave devices – filters, phase shifters, and antenna arrays. The results, as reported by Professor Mirza Bichurin to TASS, can be applied in the design of radar systems, satellite communications, and base stations where precise tuning and compactness are critical.
Researchers found that by replacing standard zirconate-titanate ceramics with single-crystal piezoelectrics like PMN-PT or PZT-PT and making the ferrite plate extremely thin – on the order of tens of micrometers – mechanical deformation is transmitted more efficiently, and the change in the resonant field becomes sufficient for practical tuning. The surface roughness of the best samples was less than 0.5 nanometers – approximately a hundred thousand times thinner than a human hair.
The findings are useful for developing tunable filters, phase shifters, circulators, and active phased array antennas – primarily in systems where precise tuning, low power consumption, and electrical control of parameters are important. In essence, the research provides engineers with a recipe: what materials and thicknesses to use for components so that a microwave device can be tuned without mechanical adjustments – simply by applying voltage.