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Dual-polarized Low-profile Wideband Filtering Antenna for 5G Applications

This paper presents a novel low-profile dual-polarized magneto-electric (ME) dipole antenna with bandpass filtering response. The proposed ME-dipole antenna consists of four shorted patches, in which the magnetic dipole mode is formed by the slot-aperture between patches. Therefore, the height of antenna is not limited to 0.25λc but can be as low as 0.11λc. By symmetrically inserting four slots on the patches, a wide impedance bandwidth is obtained, and a controllable radiation null is generated at the upper band-edge to enhance the out-of-band suppression level. On the other hand, by properly designing the length of the feeding lines, another controllable radiation null and its second harmonic null are generated on each side of the passband, improving the selectivity and suppression level of both the lower and upper stopbands without degrading the in-band performance. The measured results show that the prototype has a — 15dB impedance bandwidth of 27.6%, covering the specific 5G NR band n65 (3.3-4.2GHz). In addition, the in-band average gain is 8.2 dBi and the out-of-band suppression level is more than 20 dB.