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PIER PIER B PIER C PIER M PIER Letters
2018-04-20
Efficiency of Millimeter Wave Mobile Terminal Antennas with the Influence of Users
By
Rizwan Khan,

    Dr. Rizwan Khan

    Department of Research and Development

    Laird Technologies (M) Sdn Bhd

    Malaysia

    Homepage

Azremi Abdullah Al-Hadi,

    Professor Azremi Abdullah Al-Hadi

    Faculty of Electronic Engineering & Technology

    University Malaysia Perlis (UniMAP)

    Malaysia

    Homepage

Ping Jack Soh

    Dr. Ping Jack Soh

    Dept of Electrical Engineering

    KU Leuven

    Belgium

    Homepage

Progress In Electromagnetics Research, Vol. 161, 113-123, 2018
doi:10.2528/PIER18012409
Abstract
The effect of users on the efficiency of mobile terminal antennas at 15 GHz, 28 GHz and 60 GHz is studied in this paper. It is performed using three four-element planar arrays. The first operates at 15 GHz with a bandwidth of 0.74 GHz, the second at 28 GHz with a bandwidth of 2.5 GHz and finally the third antenna at 60 GHz with bandwidth of 12.5 GHz. The effect of a user's finger is studied when being placed on four different locations over each antenna element, with six distances between the antenna and user's finger. The losses due to the increased shadowing are studied in terms of radiation efficiency (RE), matching efficiency (ME) and two additional multiple-input-multiple-output (MIMO) parameters i.e., envelop correlation coefficient (ECC) and multiplexing efficiency (MUX). For antennas operating at 28 and 60 GHz, the minimum frequency shift is observed when the finger is placed at 1.5 mm distance from the antenna, whereas for 15 GHz, the minimum resonance shift is observed when the finger is at 2 mm distance. Losses of up to 80% and 70% are observed for RE and MUX, respectively, when the finger is placed at 0 mm for all antennas compared to the case without user (WU). Finally, it is observed that the ME and envelop correlation coefficient losses are insignificant regardless of the antenna and finger variation.
Citation
Rizwan Khan, Azremi Abdullah Al-Hadi, and Ping Jack Soh, "Efficiency of Millimeter Wave Mobile Terminal Antennas with the Influence of Users," Progress In Electromagnetics Research, Vol. 161, 113-123, 2018.
doi:10.2528/PIER18012409
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