Multipole Monolithic Surface Acoustic Wave (SAW) Resonator Filters.

摘要

This final report describes the work done and results achieved on a two-year effort to design and fabricate monolithic multipole Surface Acoustic Wave (SAW) resonator filters. The work and the report focus on two specific filter designs: one a six-pole Butterworth design at a center frequency of 217 MHz (Type I), the other a four-pole Chebyshev at 150 MHz (Type II). The specifications are listed. However, the design, testing, and fabrication techniques used are general and would apply equally well to similar SAW resonator filters in the 100 MHz to 800 MHz frequency range. Since more work was done, and the best results achieved on the 217 MHz Butterworth filter, it will be treated in more detail. Multipole SAW resonator technology can be divided logically into three technical areas, each with its own body of existing knwoledge: (1) multipole filter synthesis, (2) SAW resonator analysis and design, and (3) fabrication and packaging techniques. Where feasible, the experience and techniques already developed in other technologies have been adapted for SAW multipole design and fabrication. In particular there are may similarities between bulk wave multipole filters and the SAW counterparts. In both technologies good process control and computer modeling are essential elements in providing the accuracy and precision required to achieve a multipole design.