wideband and dual-band dipole antenna with an integrated
balun feed is given. First, the antenna structure is optimized
and a 41.5% bandwidth is obtained where voltage standing
wave ratio (VSWR) is less than 2. In order to further get a larger
bandwidth and dual-band capabilities of this antenna, some rectangle
apertures are etched onto the antenna surface, and a better
dipole antenna is fabricated. Through investigating rectangle aperture
with different sizes, a 47.8% bandwidth is obtained at L-band,
and a 15.1% bandwidth comes true at S-band. Agreement between
calculations and measurements is very good. The result indicates
that the novel design not only may obtain better wideband characteristic
but also can let the dipole antenna work at L- and S-bands.