Initial Study and Development of Piezoelectric Ceramic I-F Trans-formers

摘要

After the discussion of the technical requirements, the two basic approaches of using piezoelectric ceramic resonators for band-pass filter purposes are described. The first is to employ such resonators as electric network elements in otherwise conventionally designed filters. The simplest two structures, as reported in detail in the First Quarterly Progress Report. are reviewed and impedance and insertion loss curves are presented. The second approach, employing ceramic resonators in new unconventional ways as reported in detail in the Second and Third Quarterly Progress Reports is summarized and impedance and attenuation behavior of one-, two- and three-disk filters are described. Some technical details (polarization and electroding) and material problems including aging, temperature-coefficient, dielectric constant, and quality factor are discussed. Conclusions are drawn for the application of one- and three-disk filters and recommendations are made for future development work. Representative sample filters are described in detail in the appendix.