Open AccessEffects of the coating on S‐band microstrip filter performance
Author(s) -
Lovascio Antonio,
D'Orazio Antonella,
Centonze Veto
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.5147
Subject(s) - microstrip , coating , materials science , dielectric , conformal coating , filter (signal processing) , electronic engineering , bandwidth (computing) , printed circuit board , microstrip antenna , electronic circuit , optoelectronics , acoustics , computer science , telecommunications , electrical engineering , composite material , engineering , antenna (radio) , physics
In the past years, the conformal coating on the printed circuit board has been widely used because it offers several advantages in terms of protection and reliability of electronic circuits. However, the coating is a dielectric material, which can impact on the performance of radio‐frequency components such as microstrip filters. Hence, the coating characterisation from the dielectric point of view is essential in order to design filters that meet prefixed requirements. Although the dielectric properties of commercial conformal coatings are well known, specific analyses on the effect of the coating on devices performance for space applications are not present in the literature and the coating manufactures do not often provide an appropriate characterisation of dielectric properties, making the analysis and the design of the microstrip filters difficult. The authors discuss numerical and experimental results regarding the performance of a coupled microstrip filter and show that the presence of CV‐1152 coating causes a significant shift of the S ‐parameters. Moreover, a new configuration of the filter based on a fractal shape is proposed, which is characterised by more compact size and an optimised bandwidth.