Unattended design of wideband planar filters based on stepped impedance resonators (sirs) through aggressive space mapping (asm)

• Autores: Marc Sans Soler
• Directores de la Tesis: Juan Fernando Martín Antolín (dir. tes.)
• Lectura: En la Universitat Autònoma de Barcelona ( España ) en 2018
• Idioma: español
• Tribunal Calificador de la Tesis: Francisco Medina Mena (presid.), Francisco Javier Mata Contreras (secret.), José María López Villegas (voc.)
• Programa de doctorado: Programa de Doctorado en Ingeniería Electrónica y de Telecomunicación por la Universidad Autónoma de Barcelona
• Materias:
  • Ciencias económicas
    • Organización y dirección de empresas
      • Estudios industriales
• Enlaces
  • Tesis en acceso abierto en:  TESEO  TDX 
• Resumen

  • The synthesis of planar microwave circuits able to satisfy a set of given specifications has been a subject of interest in the microwave community for years. Despite the fact that most commercially available computer aided design tools and electromagnetic solvers include optimizers, obtaining the circuit topologies that satisfy the design requirements is generally cumbersome. Convergence to the optimum solution is not always guaranteed unless the seeding layout is already very close to the one providing the target response, and designer experience plays a key role in such optimization process as long as the circuit complexity increases.

    On the other hand, single-ended and, more specially, balanced microwave filters have become essential devices with the recent advances in the development of wireless communication technologies, where higher levels of integration and more complex microwave systems are key requirements. Therefore, a systematic procedure able to provide the filter layout satisfying the required specifications would be very welcomed by microwave engineers.

    This thesis is focused on the automatic synthesis of single-ended and balanced planar microwave filters providing wideband bandpass responses. Such filter structures are based on semi-lumped resonant elements, implemented by a combination of high and low impedance transmission line sections, also known as Stepped Impedance Resonators (SIRs). The optimization approach, based on the Aggressive Space Mapping (ASM) technique, is aimed to generate the filter layout from design specifications following a completely unattended scheme. Therefore, such filter optimization scheme can represent the first step towards an optimization tool for this type of SIR-based filters suitable to be part of any commercially available engineering software focused on microwave design.

    To this end, specific ASM-based algorithms are developed in order to automatically synthesize multiple single-ended and balanced filter topologies based on SIRs. The proposed automatic design procedures are thoroughly detailed and validated through its application to generate several filter layouts starting from different sets of practical specifications. The reported procedures and the results obtained reveal that this optimization methodology can be extended to many other filter structures, and have lead this research work to contribute to the state of the art with innovative strategies in the ASM formulation as well as with novel synthesized passband filter topologies.