Abstract
This article presents the design of a planar MIMO (Multiple Inputs Multiple Outputs) antenna comprised of two sets orthogonally placed 1 × 12 linear antenna arrays for 5G millimeter wave (mmWave) applications. The arrays are made of probe-fed microstrip patch antenna elements on a 90 × 160 mm2 Rogers RT/Duroid 5880 grounded dielectric substrate. The antenna demonstrates S11 = −10 dB impedance bandwidth in the following 5G frequency band: 24.25–27.50 GHz. The scattering parameters of the antenna were computed by electromagnetic simulation tools, Ansys HFSS and CST Microwave Studio, and were further verified by the measured results of a fabricated prototype. To achieve a gain of 12 dBi or better over a scanning range of +/−45° from broadside, the Dolph-Tschebyscheff excitation weighting and optimum spacing are used. Different antenna parameters, such as correlation coefficient, port isolation, and 2D and 3D radiation patterns, are investigated to determine the effectiveness of this antenna for MIMO operation, which will be very useful for mmWave cellphone applications in 5G bands.
Highlights
Smartphones and other electronic devices use specific frequencies in the radio frequency spectrum, typically under 6 GHz
To achieve full functionalities necessary for true millimeter wave (mmWave) 5G communications, such as beam scanning, narrow beamwidth, high gain, etc., multiple phased arrays, or massive multiple input multiple output (MIMO) mmWave antennas are expected to be implemented in 5G cellular devices [17,18,19,20,21]
A set of two orthogonal arrays are designed using the Dolph-Tschebyscheff excitation weighting presented in this article to achieve a larger gain with scanning beams and better polarization diversity performance, which will be eminently suitable for mmWave 5G cellular applications
Summary
Smartphones and other electronic devices use specific frequencies in the radio frequency spectrum, typically under 6 GHz. To achieve full functionalities necessary for true mmWave 5G communications, such as beam scanning, narrow beamwidth, high gain, etc., multiple phased arrays, or massive MIMO mmWave antennas are expected to be implemented in 5G cellular devices [17,18,19,20,21]. A two-port mmWave MIMO-based slot antenna with an electromagnetic bandgap (EBG) reflector has been proposed in [13], which has a peak gain of 11.5 dBi and improved MIMO performance. A set of two orthogonal arrays are designed using the Dolph-Tschebyscheff excitation weighting presented in this article to achieve a larger gain with scanning beams and better polarization diversity performance, which will be eminently suitable for mmWave 5G cellular applications.
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