TY - JOUR 
A1 - Albero Ortíz, Antonio
AU - Monzó Cabrera, Juan
AU - Díaz Morcillo, Alejandro Benedicto
AU - Requena Pérez, María Eugenia
T1 - Combined use of genetic algorithms and gradient descent optimization methods for accurate inverse permittivity measurement
Y1 - 2006
SN - 0018-9480
UR - http://hdl.handle.net/10317/1427
AB - A novel inverse transmission-line method for the
complex permittivity determination of arbitrary shaped materials
is presented. Complex permittivity is inferred by using an inverse
calculation procedure, which is based on a combined optimization
strategy of both genetic algorithms and the gradient descent
method. The optimization procedure matches the measured and
simulated complex scattering parameters’ frequency behavior
of materials within a WR340 waveguide. High accuracy and
practical suitability are validated through experimental tests.
The dielectric properties of PTFE and epoxy resin mixed with
iron–oxide-doped fiberglass have been measured for different
shapes and positions. Dielectric multilayer structures have been
used to demonstrate that this technique is able to measure the
individual permittivity of each element of the structure. Both twoand
three-dimensional approaches have been carried out and their
advantages and drawbacks discussed.
KW - Teoría de la Señal y las Comunicaciones
KW - Medición de permitividad compleja
KW - Método GD
KW - Energía de microondas
KW - Complex permittivity measurement
KW - Gradient descent (GD) method
KW - Microwave energy
KW - Algoritmos genéticos (AG)
KW - Genetic algorithm (GA)
LA - eng
PB - IEEE Microwave Theory and Techniques Society
ER -