Very low amplitude ripple SAW filter for infrastructure systems using 41°Y-X lithium niobate: Full FEM/BEM design approach

High data rate communication devices demand high relative bandwidth and therefore wide band filters are necessary. In infrastructure systems like base stations and microwave radio-links, such filtering function was carried out by ceramic filter technology. They were preferred for their low in-band ripple and VSWR necessary for low EVM and amplifier linearity. We have developed a design technique allowing SAW devices to advantageously replace ceramic filters in many systems.