SAW Filters for Mobile Communications: Achievements and Prospects

Modern achievements and directions of improvement of surface acoustic wave (SAW) filters for mobile communication systems are presented. SAW technology is continues to dominate in a tasks of filtration in radio frequency (RF) part of telecommunication systems. Innovative technologies of filters production and packaging allow to improve their characteristics and can reduce the size. I.H.P. SAW filter have a high Q-factor and good temperature and frequency characteristics. The main requirements to modern SAW filters are minimal losses, temperature stability, low level of nonlinear signals, high power durability, small dimensions. CSSP (Chip Sized SAW Package) technology and DSSP (die-sized SAW packaging) technology allow to produce miniature components and can integrate them into modules. The current trend of increasing the number of frequency bands and the introduction of new standards makes the problem of creating a flexible RF module with high-quality tunable SAW filters extremely actual.