This work reports the development of two high-performance waveguide-based antenna arrays for 5G cellular networks, operating in the underutilized millimetre wave (mm-wave) frequency spectrum. Two different scenarios of mm-wave communications are proposed for illustrating the applicability of the proposed arrays, which provide specific radiation patterns, namely, 12 dBi gain omnidirectional coverage in the 28 GHz band and dual-band sectorial coverage using the 28 and 38 GHz bands with gain up to 15.6 dBi. Numerical and experimental results of the array reflection coefficient, radiation pattern, and gain have been shown in an excellent agreement.
Hemispherical dielectric lens antennas can be designed to present multifunctional operation. Simple and efficient mathematical modeling to design these structures is presented. The constructing technique is based on the lens material and the desired operational frequency of the dielectric lens antennas. The analytical developed model was compared with both complete wave numerical simulations and practical experiments. The results indicate that the proposed equations to build hemispherical dielectric lens antennas are adequate for different operational frequencies and also for different dielectric lens materials.
This paper presents a high-directivity ultra-wideband beamsteering antenna array. An innovative beamsteering system based on hemispherical dielectric lenses fed by a set of different printed antennas is proposed. Diversity of signals in different spatial positions can be radiated at the same time. A prototype was manufactured and characterized, operating in a bandwidth varying from 8 GHz to 12 GHz with gain up to 13 dBi.
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