Hi All,
What is the difference between a SAW resonator and a SAW filter? Are they interchangeable? (I.E. Will a SAW resonator act as a filter; and can a SAW filter be used as the frequency determining element in a UHF/VHF oscillator?).
Thanks!
Bill
A SAW delay line filter can be thought of as two antenna facing each other that operate not in the electromagnetic domain but in the acoustic domain. Each "antenna" is an interdigitated transducer the bandwidth of the transducer is a function of the length, i.e. number of interdigitated transducer pairs. The overall bandwidth will be that of the combination of the two transducers. Complications are that a simple transducer is bidirecional but more modern transducers are unidirecional like yagi antennae. If only one transducer is used and mirror gratings are placed in front and behind then the lost bidirecional energy is reflected back and forward i.e. you have a resonator. Two transducers between the mirrors gives a 2 port resonator. Resonators make low loss narrow band filters delay line filters can be wide band the more loss the better shape and bandwidth.
In message , billcalley writes
-- dd
Thanks Doug!
Bill
doug dwyer wrote:
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.