FERROELECTRIC CERAMIC FILTERS, IF TRANSFORMERS, AND NETWORKS
Abstract
Application of existing theory for the propagation of elastic waves in thin plates appears to give a plausible explanation for the behavior of high frequency AT-cut quartz resonators and dot resonators on flat wafers. Experimental measurements of inter-resonator coupling and interaction between resonator and water edge appear to be in agreement with theory. Parallel combinations of quartz and ceramic resonators yield a strong zero and pole of impedance corresponding to resonance and antiresonance of the ceramic, a strong zero of impedance corresponding to resonance of the quartz, and a very weak pole contributed by the antiresonance of the quartz. The addition of parallel quartz resonators with appropriately located frequencies to a ceramic ladder filter should yield stable poles of attenuation defining the edge of the pass band without otherwise affecting the pass band behavior. Thickness expander resonators made of hot pressed ceramic have substantially improved resonant response characteristics at 12 mc over those using conventionally fabricated ceramic.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 23, 1963
- Accession Number
- AD0408626
Entities
People
- D. J. Koneval
- Damian Curran