This letter describes a planar ultrawideband Vivaldi antenna for base-station pattern diversity applications. It is designed to cover most of the cellular and LTE bands, a very wide frequency range from 0.7 to 2.7 GHz. It is formed by two adjacent Vivaldi tapered slots with a rotated angle of 29° between them. The antenna is miniaturized by sharing some common structure and cutting the noncritical board area. It is designed step by step from a single Vivaldi element with a microstrip line feeding to a dual-slot pattern diversity radiator with uniform radiation patterns. It is fabricated and tested inside a near-field chamber. The radiation performance, including both in-phase and 180° out-of-phase differential feeding cases, is verified by simulation as well as experiment. The measured results show good agreement with the simulation. It could be useful for base station and other smart array systems.
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Dong et al. (2017) studied this question.
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