Design and Implementation of Acoustic-Wave-Lumped-Element Resonator-Based Filters Using Classical Cascade Synthesis Approach

Date

2023-9-05

Author

Karahan, Yağmur

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Acoustic wave technology provides a medium for higher selectivity in smaller volumes in RF filter designs due to its piezoelectric nature. However, acoustic wave resonators (AWR) and AWR-based filters have bandwidth limitations depending on the electromechanical coupling coefficient of their piezoelectric substrates. To achieve wider bandwidth, AWR-based lumped element hybrid filter topologies are designed using a coupling-matrix(CM)-based synthesis approach. This thesis presents the design of Acoustic-Wave-Lumped-Element Resonator(AWLR)-based filters using the classical cascade synthesis approach as a simpler and more practical method instead of the CM-based synthesis approach. As AWR, surface acoustic wave (SAW) resonators are used in the designs. Basics of SAW technology, the structure of a SAW resonator, the resonator’s Butterworth-Van Dyke (BVD) model, and SAW resonator-based filters are investigated and focused on AWLR modules for different filter topologies. During the design process, a BVD model is extracted for a commercially available one-port 418MHz SAW resonator. Targeted filters are synthesized using filter design software FILPRO, and Genesys software is used for further optimization. The BVD model of the 418MHz SAW resonator and the classical cascade synthesis methods in the FILPRO environment are used to design hybrid filters. Hybrid band-pass, band-stop, linear phase filters with different orders and topologies, and hybrid diplexer (Channel 1 at 418MHz and Channel 2 at 433.92MHz) are designed. These designs are implemented using SMD (surface mount device) SAW resonators and lumped elements. The measured and simulated results are compared regarding some performance metrics such as bandwidth, fractional bandwidth, quality factor, insertion loss, and return loss.

Subject Keywords

Acoustic wave resonator (AWR), Acoustic-wave-lumped-element resonator (AWLR), Surface acoustic wave (SAW) resonator, Butterworth-Van Dyke (BVD) model, RF filter, Filter synthesis

URI

https://hdl.handle.net/11511/105405

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Graduate School of Natural and Applied Sciences, Thesis