In recent years, wireless communication that usually uses
high speed data communication such GPS (Global Positioning
System) and WLAN (Wireless Local Area Network) is putting
a higher challenge to antenna designer to create smaller and
high performance antenna. The antenna which has capability to
handle more than single frequency band is also being
considered as an important feature, since it can simplify
antenna system for a single device with ability to connect to
different networks. For this purpose, the microstrip patch
antenna has been one of solutions to be considered due to its
small dimension, light weight, low profile, easy and cheap
fabrication. Furthermore, the microstrip patch antenna
sometimes can also be designed to have dual frequency bands
response. Unfortunately, the dimension of antenna cannot be
made any shorter than half wavelength at the desired operating
frequency, since the antenna only resonates at the patch length
of the order of half wavelength [1]-[3]. Moreover, some
techniques emphasized for reducing the dimension of
microstrip patch antenna have been proposed and developed by
the antenna designer, such as by implementing short circuiting
stub, cutting slot at the ground plane and using substrate with
higher dielectric constant [4]-[6]. The proposed techniques,
however, sometimes have to be paid by sacrificing other
important features, such as gain and bandwidth