A Differentially-Fed High-Gain Tri-Band Hybrid Antenna for 2.4/3.5/5.2 GHz

In this paper, the technique of hybrid modes of patch, slot and dipole antennas is proposed for generating triple bands. A simple ultrawideband out-of-phase power splitter (OPS) is first designed with equal power splitting and accurate phase difference of 180° between the two output ports. Then, the OPS is used to feed the radiator, consisting of a rectangular patch, a slot and a dipole, which are integrated into a single substrate. Simulated results show that the antenna has a tri-band of 2.39-2.50 GHz (4.5%), 3.41-3.73 GHz (9.0%), 5.15-5.35GHz (3.8%), with the corresponding peak gains of 6.6, 8.2 and 7.0 dBi, respectively. The radiation patterns are unidirectional, symmetrical and stable within the three bands, and the cross-polarization is lower than - 26 dB.