This article presents a dual-resonator antenna where a
stacked microstrip patch antenna uses a protruding dielectric rod for
high gain, and a sleeve-dipole antenna to support the rod as well as to
resonate at another frequency. The proposed antenna structure could
be optimized at any two frequencies. However, we designed the
microstrip patch to resonate at 2.44 GHz while the sleeve-dipole at
0.859 GHz. Main points of designing considerations and electrical
performances of a fabricated antenna were briefly discussed.