Compact balanced dual-band bandpass filter with magnetically coupled embedded resonators

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Author(s): Armando Fernández-Prieto¹ ; Jesus Martel² ; Pedro Jose Ugarte-Parrado¹ ; Aintzane Lujambio³ ; Alejandro Javier Martinez-Ros⁴ ; Ferran Martín⁵ ; Francisco Medina¹ ; Rafael R. Boix¹
- Affiliations: 1: Department of Electronics and Electromagnetism, Faculty of Physics , Universidad de Sevilla , Av. Reina Mercedes, 41012-Sevilla , Spain ;
  2: Department of Applied Physics II , Universidad de Sevilla, ETSA , Av. Reina Mercedes, 41012-Sevilla , Spain ;
  3: ALTER TECHNOLOGY TUV NORD S.A.U. , C/ Thomas A. Edison 4, PCT Cartuja, 41092-Sevilla , Spain ;
  4: Department of Applied Physics I , Universidad de Sevilla ETSII , Av. Reina Mercedes, 41012-Sevilla , Spain ;
  5: CIMITEC, Departament d'Enginyeria Electrònica , Universitat Autònoma de Barcelona , Bellaterra, 08193-Barcelona , Spain
Source: Volume 13, Issue 4, 27 March 2019, p. 492 – 497
DOI: 10.1049/iet-map.2018.5573 , Print ISSN 1751-8725, Online ISSN 1751-8733

A compact, balanced, dual-band bandpass filter with flexible and independent control of the differential-mode response is presented in this study. The filtering mechanism relies on the use of magnetically coupled embedded resonators. This provides two clear advantages: high level of miniaturisation and two differential-mode passbands that can be independently tuned. The response of the differential-mode is controlled by the external quality factor and coupling coefficients, whereas the common-mode is inherently rejected thanks to the use of a magnetic coupling mechanism. In order to illustrate the benefits of this structure, a prototype example is designed, fabricated and measured. Good differential- and common-mode performance has been obtained.

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Compact balanced dual-band bandpass filter with magnetically coupled embedded resonators

References

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