A General Synthesis Technique of Mixed-Topology including Parallel-Connected Structures for Fully Canonical Ladder-Type Acoustic Filters

Angel Triano*, Jordi Verdu, Pedro De Paco Sanchez

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A synthesis method for mixed-topology fully canonical filters native oriented to acoustic wave (AW) technology is presented in this article. The method combines inline sections with parallel-connected structures to generate ladder-like networks. In regards to the classical ladder filters, this topology exhibits more flexibility in terms of transmission zeros (TZs) allocation above and below the passband by disassociating the TZs from the resonance frequency of the resonators. This degree of freedom can also be used as an advantage to accommodate the technology constraints of AW resonators. In addition to the general synthesis method, it is provided a set of considerations to be taken into account in designing a feasible filter for AW technology. To show the robustness and capabilities of the methodology proposed have been included two synthesis examples and experimental assessment by using an equivalent reactance Butterworth Van Dyke model for rapid prototyping.

Original languageAmerican English
Article number8897712
Pages (from-to)5061-5068
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Volume67
Issue number12
DOIs
Publication statusPublished - Dec 2019

Keywords

  • Acoustic wave (AW) technology
  • asymmetrical polynomials
  • dangling resonator
  • mixed-topology
  • parallel-connected
  • phase correction

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