Open AccessCompact balanced dual‐band bandpass filter with magnetically coupled embedded resonators
Author(s) -
FernándezPrieto Armando,
Martel Jesus,
UgarteParrado Pedro Jose,
Lujambio Aintzane,
MartinezRos Alejandro Javier,
Martín Ferran,
Medina Francisco,
Boix Rafael R.
Publication year - 2019
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2018.5573
Subject(s) - band pass filter , resonator , coupling (piping) , filter (signal processing) , differential (mechanical device) , q factor , inductive coupling , dual mode , control theory (sociology) , coupling coefficient of resonators , mode (computer interface) , multi band device , physics , electronic engineering , topology (electrical circuits) , computer science , materials science , optoelectronics , engineering , electrical engineering , telecommunications , control (management) , antenna (radio) , quantum mechanics , artificial intelligence , metallurgy , thermodynamics , operating system
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.