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The Sierpinski tetrahedron-based antenna was simulated with finite element method ( FEM ) modeling and experimentally tested to highlight its potential for wideband communications .
 concept or principle: finite element method; concept or principle: FEM; enabling technology: modeling
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: finite element method, FEM, modeling 
Answer:
 concept or principle: finite element method; concept or principle: FEM; enabling technology: modeling