Magnetoelectric Dipole Antennas Loaded With Meta-Lens for 5G MIMO Pattern Diversity Applications
| Autor: | Mehri Borhani Kakhki, Marco A. Antoniades, Abdolmehdi Dadgarpour, Abdel R. Sebak, Tayeb A. Denidni |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Antennas and Propagation. 70:7112-7117 |
| ISSN: | 1558-2221 0018-926X |
| DOI: | 10.1109/tap.2021.3111652 |
| Popis: | This paper presents a unique design of a dual-polarized wideband passive beam-switching antenna at millimeter-wave bands for MIMO pattern diversity applications, which exhibits low correlation between the ports and a broad tilt bandwidth. A magneto-electric (ME) dipole fed by a printed ridge gap waveguide (PRGW) as a quasi TE source is considered as the elementary antenna in the Ka-band. To achieve beam deflection in each quadrant, a 4-port MIMO prototype consisting of four ME-dipoles, positioned perpendicular to each other, is integrated with a meta-lens that consists of three layers of 12×12 dual-polarized SRRs offset from the center of each antenna. The beamforming structure is able to generate four fixed beams, one in each quadrant at an elevation angle of ~40° with respect to the broadside direction by exciting each port sequentially while the other ports are terminated. Moreover, the proposed orthogonal structure contributes to low correlation between the four ports, while achieving dual-polarization, which highlights the suitability of the antenna for 5G mm-wave applications. The measured results from a fabricated prototype demonstrate a -10 dB impedance bandwidth of 40% over 24-36 GHz, tilting bandwidth of 32.2%, and a peak gain of 13.4 dBi at 29 GHz, while an isolation better than 30 dB is achieved over the whole frequency band. Moreover, a measured radiation efficiency in excess of 85% is obtained, due to the use of the low-loss PRGW feedlines. This technique allows us to overcome critical limitations of existing beam-switching methods, such as Butler matrices, in particular for applications requiring a wide bandwidth. The diversity performance of the MIMO antennas has also been evaluated through the ECC, DG and TARC parameters, and good results are obtained. |
| Databáze: | OpenAIRE |
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