ABSTRACT Bandwidth enhancement and size reduction
techniques for microstrip patch antennas are demonstrated
theoretically and experimentally. Three novel designs of
small broadband microstrip patch antennas for 3G mobile
communications are presented: two forms of shorted coplanar
patch antenna, and an E-shaped antenna. By optimising the
geometry, using ground planes and short circuits. the size of
the antennas can be reduced considerably. The predicted and
measured impedances of the three proposed designs are
discussed.