Fig. 3 also shows that the maximum radiations are on
the same directions for the both frequency bands. Some
remarks on the configuration of the antenna can be given out as
follows: At first, by cutting three slots in the right-hand side
branch, the length of the monopole L2, which is designed to
generate a resonant path for current at the 2.4 GHz frequency
band, is reduced from 23.5 mm in [11] and 20.5 mm in [13] to
18 mm.