Abstract
This paper presents a low-profile Ultra Wide Band (UWB) antenna with polarization diversity for new 5G base stations. The antenna consists of a metallic ring capacitively fed with four circular monopoles and reinforced with a cylindrical cavity to generate a unidirectional radiation pattern. The Theory of Characteristic Modes is used to analyze and explain the behaviour of the proposed antenna excited with differential feeding configurations. A prototype of the optimized design has been manufactured and measured, yielding good impedance matching (S11<-10 dB) from 3 GHz to 6 GHz with maximum directivity of 10.51 dBi. Measured and simulated results are in good agreement.
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