Re: Question-dielectric filter, SAW filter, ceramic differen
Hi, Alvin
At first ceramic is also a kind of dielectric.
Below 5GHz the main purpose of designing filter for band-selectivity in mobile devices is to improve the selectivity and reduce its size. Single-block filters based on high permittivity ceramic suitable for SMT(surface mounting technoloby) was uese long time ago. After a while, SAW filter with accoustic-microwave energy transformer has a small insertion loss and very compact size because of the microelectronic process, which makes SAW filter for mobile devices.
But at high microwave frequencies, high Q ceramic resonator and filter are used for high quality application.