For system flexibility and feasibility, antennas that
have the ability to operate in both of the specified operation bands
are highly desired. A slot antenna has special advantages because of
its simple structure, such as wider bandwidth, less conductor loss, and
better isolation between the radiating element and feed network [1–4].
It can also provide the merits of low profile, low cost, small size, easier
integration with other circuits and conformability to a shaped surface.