Title :
High performance stacked crystal filters for GPS and wide bandwidth applications
Author :
Lakin, K.M. ; Belsick, J. ; McDonald, J.F. ; McCarron, K.T.
Author_Institution :
TFR Technol. Inc, Bend, OR, USA
Abstract :
Stacked Crystal Filters, (SCF), are composed of multi-layers of piezoelectric and metal layers. Normally these filters have a complex frequency spectrum containing near-in spurious responses. However, by having the SCF formed in a Solidly Mounted Resonator (SMR) format, the performance of the device is greatly improved by the finite bandwidth of the SMR reflector. The conventional SCF also has a bandwidth that is too small for some wireless applications. This paper will describe the design and performance issues associated with stacked crystal filters using bulk wave thin films with aluminum nitride as the piezoelectric. Filters without spurious responses, filters having wide bandwidths, and filters operating at frequencies up to 8.5 GHz will be described in addition to GPS filters
Keywords :
Global Positioning System; aluminium compounds; band-pass filters; crystal filters; crystal oscillators; piezoelectric semiconductors; semiconductor thin films; wide band gap semiconductors; 8.5 GHz; AlN; GPS; Solidly Mounted Resonator format; bulk wave thin films; finite bandwidth; high performance stacked crystal filters; piezoelectric/metal layers; stacked crystal filters; wide bandwidth applications; Aluminum nitride; Bandwidth; Electrodes; Equivalent circuits; Frequency response; Global Positioning System; Piezoelectric films; Power harmonic filters; Resonance; Resonator filters;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991849
