Compact Balanced Dual-Band Bandpass Filter Based on Modified Coupled-Embedded Resonators

BAĞCI F., Fernandez-Prieto A., Lujambio A., Martel J., Bernal J., Medina F.

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, vol.27, no.1, pp.31-33, 2017 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 1
  • Publication Date: 2017
  • Doi Number: 10.1109/lmwc.2016.2629962
  • Journal Name: IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.31-33
  • Keywords: Balanced filter, common-mode suppression, dual-band filter, COMMON-MODE SUPPRESSION, DESIGN
  • Ankara University Affiliated: Yes

Abstract

A new compact balanced dual-band bandpass filter based on coupled-embedded resonators with modified ground plane is presented in this work. Common-mode is rejected within the two differential passbands by symmetrically introducing four coupled U-shaped defected ground structures below the resonators. Common-mode rejection is significantly improved when compared with the standard (solid ground plane) filter with similar geometry thanks to the introduction of four extra transmission zeros. Due to the symmetry, the differential mode is not significantly affected by the presence of the U-shaped resonators. Circuit-model data, full-wave simulations and measurements are provided to verify the benefits of the proposed dual-band filter.