High frequency modeling of SMD resistors
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Wireless, photonics and space engineering (MPWPS), MSc
Publicerad
2024
Författare
Andersson, John
Fahd, Malik
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Passive components, including resistors, capacitors, and inductors, are fundamental in electrical circuit design. Surface mount devices (SMDs) are extensively used
in microwave hardware development at high frequencies and precise simulations of
SMD components are crucial. This thesis highlights the unpredictability of SMD
resistors and underscores the importance of accurate simulations for achieving expected performance and creates a 3D and equivalent circuit models of 0402 and
0201 SMD resistors to do this. 3D models are created and verified using real measurements of a SMD resistor up to 32 GHz, while the target is for the model to
be valid in 42 GHz. This model is used to create an equivalent circuit model and
a scalable model for ADS that can scale the substrate height, relative permittivity
and the resistance of the resistor which can be used when developing microwave
circuits such as attenuators. The film that is the resistive element of the SMD component is shown to be the biggest contributing factor to parasitics. The thickness
and width of the film were studied, and it was concluded that the width affected
the parasitics the most. Results show very good agreement between 3D model and
real measurement as well as agreement between equivalent circuit models and 3D
models. The scalability ranges between 0-500 Ohm with relative permittivity being
adjustable between 2.6-5 and 4.7-13 Mil substrate height. Through optimization
using the scalable model, a T-attenuator is created and compared with a 3D simulation which shows very good agreement in S11 with less agreement in S21 in terms
of a small frequency shift. The methods of this thesis can be extended to creating
models of SMD inductors and conductors.
Beskrivning
Ämne/nyckelord
3D modeling, Equivalent circuit modeling, Scalable models, passive com ponents, SMD resistors, high-frequency applications, parasitic effects, HFSS, ADS