Abstract
Surface acoustic wave (SAW) filters employing a unidirectional interdigital transducer (UIDT) show low loss, wide band properties. In this paper we describe a new single phase unidirectional transducer (UDT) of about λ/4 electrode width with the best transducer efficiency. The new UDTs are fabricated on the very thin dielectric grating or very shallow groove grating SAW substrates. The electromechanical couplings (k2) of electrodes on SiO2 gratings decrease rapidly for film thickness. Therefore the good properties of UDT are obtained for very thin SiO2 (about 0.3 µm and 0.03 µm at 100 MHz and 1 GHz, respectively). The calculation results show wide-band, low-loss filters with various k2 materials. Also, the electrodes of λ/2 width have large reflection coefficients of SAW. The calculation and experimental results of SAW resonators with λ/2 electrode width and λ-period using susceptance changes are described.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
