Abstract
A compact end-fire wearable Yagi-Uda antenna covering the entire 57–64 GHz frequency band is characterized in free space, in the presence of a skin-equivalent phantom and under bending conditions. The results demonstrate that, when placed on the body and/or bended, the antenna preserves satisfactory performances. The possibility of its use for an on/off-body communications at 60 GHz is investigated numerically and experimentally in a representative scenario in terms of E-field and power flow distributions, as well as in terms of path gain. It is shown that this antenna is a suitable candidate for high-data-rate short-range on/off-body transmissions.
Highlights
The unlicensed 57–64 GHz band has been identified as a highly promising solution for body area networks (BAN) [1] since it provides several advantages compared to microwave BAN [2].very high data rates can be reached [3] whilst providing high level of securityElectronics 2014, 3 and low interference with adjacent networks [4]
In [13] a textile Yagi-Uda antenna matched in the 57–64 GHz band with an end-fire radiation pattern is characterized in the presence of a flat skin-equivalent phantom, without considering the bending effect
At microwaves, bending effect has been widely studied for different antenna types, such as patch antenna [15,16,17,18], planar inverted F-antenna (PIFA) [19], dual-band antenna printed on electromagnetic band gap structure (EBG) [20]
Summary
The unlicensed 57–64 GHz band has been identified as a highly promising solution for body area networks (BAN) [1] since it provides several advantages compared to microwave BAN [2]. In [13] a textile Yagi-Uda antenna matched in the 57–64 GHz band with an end-fire radiation pattern is characterized in the presence of a flat skin-equivalent phantom, without considering the bending effect. At microwaves, bending effect has been widely studied for different antenna types, such as patch antenna [15,16,17,18], planar inverted F-antenna (PIFA) [19], dual-band antenna printed on electromagnetic band gap structure (EBG) [20] These studies showed that antenna impedance matching and radiation patterns are affected by bending. The wearable Yagi-Uda antenna operating in the 57–64 GHz range briefly introduced in [14] is characterized for the first time under bending conditions on a skin-equivalent phantom.
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