Su Lijuan, Vélez Paris, Muñoz-Enano Jonathan, Martín Ferran
CIMITEC, Departament d'Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
Sensors (Basel). 2021 Dec 13;21(24):8334. doi: 10.3390/s21248334.
Microstrip transmission lines loaded with dumbbell defect-ground-structure (DB-DGS) resonators transversally oriented have been exhaustively used in microwave circuits and sensors. Typically, these structures have been modelled by means of a parallel LC resonant tank series connected to the host line. However, the inductance and capacitance of such model do not have a physical meaning, since this model is inferred by transformation of a more realistic model, where the DB-DGS resonator, described by means of a resonant tank with inductance and capacitance related to the geometry of the DB-DGS, is magnetically coupled to the host line. From parameter extraction, the circuit parameters of both models are obtained by considering the DB-DGS covered with semi-infinite materials with different dielectric constant. The extracted parameters are coherent and reveal that the general assumption of considering the simple LC resonant tank series-connected to the line to describe the DB-DGS-loaded line is reasonable with some caution. The implications on the sensitivity, when the structure is devoted to operating as a permittivity sensor, are discussed.
横向加载哑铃形缺陷接地结构（DB-DGS）谐振器的微带传输线已在微波电路和传感器中得到广泛应用。通常，这些结构是通过与主传输线串联的并联LC谐振回路来建模的。然而，这种模型的电感和电容没有物理意义，因为该模型是通过对一个更现实的模型进行变换推导出来的，在这个更现实的模型中，由与DB-DGS几何形状相关的电感和电容的谐振回路描述的DB-DGS谐振器与主传输线磁耦合。通过参数提取，考虑覆盖有不同介电常数的半无限材料的DB-DGS，获得了两种模型的电路参数。提取的参数是一致的，并且表明，在谨慎的情况下，用与传输线串联的简单LC谐振回路来描述加载DB-DGS的传输线这一一般假设是合理的。讨论了该结构用作介电常数传感器时对灵敏度的影响。
