The squared cosine profile can be expressed by varying
Ws/2 ::; y ::; W/2. The width of the antenna Wa is set to close the
half free space wavelength at 2.4 GHz, which is lowest
frequency for antenna design. To investigate the perfonnance
of the proposed antenna, the commercially simulation
software CST was used for numerical analysis and to obtain
the optimal antenna geometric parameters as summarized in
Table I.