Open AccessCharacterisation of antenna substrate properties using surrogate‐based optimisation
Author(s) -
Nguyen Phuong Minh,
Chung JaeYoung
Publication year - 2015
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.2014.0627
Subject(s) - test fixture , dissipation factor , permittivity , antenna (radio) , materials science , electronic engineering , computer science , antenna measurement , substrate (aquarium) , radiation pattern , acoustics , optoelectronics , dielectric , engineering , telecommunications , physics , oceanography , programming language , geology
In the current study, the authors present a technique to characterise the permittivity and loss tangent of an antenna substrate. In this method, an error function is formulated with measured data and a set of simulation data on the antenna's impedance and bandwidth. Subsequently, a surrogate‐based optimisation code is used to intelligently search for the substrate parameters that minimise the error function. The validity of the method is demonstrated by experiments on wearable patch antennas with felt substrates. The results show that the method is effective in retrieving the permittivity and loss tangent of the antenna substrate using the antenna itself as the test fixture. Thus, there is no need to prepare additional resonators or transmission‐line fixtures as in conventional substrate characterisation methods.