Browsing by Author "Islam, Mazidul"

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Diagnostics of the Phased Array for E-Band Using Holography Data
(2018) Leino, Mikko; Islam, Mazidul; Ala-Laurinaho, Juha; Viikari, Ville
A4 Artikkeli konferenssijulkaisussa
This paper presents antenna diagnostics of a 4 by 4 phased antenna array for 71–86 GHz, which could be potentially used as a future 5G access point. The antenna elements have their own phase shifters each and are fed from the one-port feeding network, which results in a challenge in single element performance analysis. To overcome this, the antenna has been measured with a near-field scanner and the acquired data is processed to form the holography presentation of the antenna radiation at its very aperture. The hologram results are further handled to analyze the phase shifters of each element and the operation of the feeding network over the observed frequency range. The mean amplitude and phase for the each element are calculated and the results are verified by calculation of the far-field using the processed values and compared to the far-field measurement results. The results show good agreement and the phase shifters work as intended resulting in the antenna beam steering accordingly. However, the feeding network is quite frequency-sensitive and it leaves much improvement especially for the 75–82 GHz band.
E-Band Beam-Steerable and Scalable Phased Antenna Array for 5G Access Point
(2018-11-28) Islam, Mazidul; Leino, Mikko; Luomaniemi, Rasmus; Song, Jinsong; Valkonen, Risto; Ala-Laurinaho, Juha; Viikari, Ville
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This paper presents a new implementation of the beam-steerable two-dimensional phased antenna array for the forthcoming 5G networks. The antenna enables easy integration of phase shifters and other active electronics on a single PCB, low-loss feed network, low profile, and beam steering in both azimuth and elevation plane. In addition, the antenna is scalable in the number of elements and it can be made compatible with low-cost mass production in plastic injection molding with a metal coating. The antenna consists of a rectangular waveguide feed network, waveguide-to-PCB transitions, phase shifters on a PCB, and horn antenna radiating elements. The parts have been first designed and simulated individually and the operation of the whole structure is then verified by electromagnetic simulations. The phase shifter used in this work is a meandered microstrip line section, but the structure also enables the implementation of active phase shifters. A four-by-four antenna array prototype was manufactured. The beam-steering properties of the phased antenna array have been tested with radiation pattern measurements at 72.5 GHz, and the measured gains are compared with the simulated ones. The measured gains are 15.2 and 11.2 dBi for the boresight beam, and the beam was steered to 40°.