Similar geometries of microstrip
antennas inductively and capacitively coupled to coplanar lines
have also been investigated experimentally [3]. So far, however,
only one theoretical analysis has been published [2]. Nevertheless,
due to some simplified assumptions and the convergence problems
encountered in the numerical calculations, there were only five
points shown on the reflection coefficient curve presented in
[2]. To thoroughly understand the characteristics of the coplanar
waveguide-fed microstrip antennas, five calculation points are not
good enough; more analysis work is required