Slant 45° polarized multi-frequency cylindrical slot-dipole antenna

This paper proposes a slant 45° polarized multi-frequency antenna intended for MIMO base station application. The frequency covers three frequency bands, the PCS band, the IMT band and the IMT-E band of the spectrum ranging from 1850 MHz to 2690 MHz and it produces omnidirectional radiation pattern in the horizontal plane. The antenna structure consists of a cylinder with thin slots and is surrounded by dipole antennas arranged orthogonally above the slots. Good performance is achieved in both S-parameter and directivity results with the gain of more than 2 dBi and the gain difference of less than 2 dBi. The proposed antenna is fed using a disk-shape 4-way tournament feeding circuit and the results confirm that the proposed antenna is effective as an omnidirectional slant 45° polarized multi-frequency antenna.