A refined method to compute the radiation characteristics of microstrip ant
ennas on finite substrates is presented. Electric surface and volume polari
zation currents are approximately calculated using the Green's function of
an infinite dielectric slab. A comparison with measured radiation patterns
shows that the excitation aia coaxial probe needs to be included in the cal
culations for more accurate results. (C) 1999 John Wiley & Sons, Inc.