For illustrating the performance of the proposed dipole antenna, comparisons between the proposed
dipole antenna and other similar small printed dipole antennas in terms of bandwidth, antenna gain
and antenna size are given in Table 1. According to the table, the proposed antenna and the antennas
in [9, 17] can cover wide impedance bandwidth with low-profile structures. However, the antennas
in [9, 17] have larger size compared with the proposed antenna. Though the size of the antennas
in [9, 17] could be miniaturized by using a substrate with a higher dielectric constant, the proposed
antenna can easily provide a wider impedance bandwidth. The antennas in [19, 20] can realize 2.8 : 1
and 3.89 : 1 impedance bandwidth, respectively. However, the additional baluns will increase the
antenna size compared with the proposed antenna. The antenna in [22] has a similar size compared
with the proposed antenna. The bandwidth of the designed antenna far exceeds that of the antenna
in [22]. The performance of the presented dipole antenna also exceeds the performance of design in [24].
In contrast with the similar small printed dipoles with wideband performance and antenna size, the
proposed dipole antenna achieves a wider impedance bandwidth under a small overall area. A relatively
flat gain response is also obtained in the operating bandwidth.