Compact 60GHz Array Antenna for Body Centric Wireless Communication

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2020
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This report presents the design of compact 60Ghz antenna array for body centric wireless communication. It can be categorized as a simulation-based antenna design which can be helpful for medical purposes in future. Design of 60 GHz, high gain millimeter-wave antenna has been proposed in this report. Using Computer Simulation Technology (CST) the performance of the antennas was evaluated in both free space and on-body scenario for body-centric communication. The 1st antenna is a swan shape patch type on a substrate. A notch is cut from the radiator while a strip is asymmetrically attached to the radiator. In free space, the simulation and measurement show that the miniaturized antenna achieves a broad operating bandwidth of 15.945 GHz for a 10-dB return loss. In particular, the ground-plane effect on impedance performance is greatly reduced by cutting the notch from the radiator because the electric currents on the ground plane are significantly suppressed at the lower edge operating frequencies. The antenna features three-dimensional omni-directional radiation with high radiation efficiency of 71.27% across the 60 GHz resonant frequency with gain 4.422dBi. Parametric studies were carried out by changing width, height, feedline, etc. for performance comparison. For the on-body scenario the antenna was put at five different distances from a torso phantom and a slight shift to the right of the resonant frequency was observed while the bandwidth was close to 16.12 GHz for each of these distances. In addition, for increasing gain of the antenna an array design is proposed where two antennas designed in a single substrate and feed with a single feedline. The 2nd antenna is a Q-slot cut patch type on a FR-4 substrate. A Q shape is cut from the rectangular radiator. In free space, the simulation and measurement show that the miniaturized antenna achieves a broad operating bandwidth of 12.111 GHz for a 10-dB 5 return loss. The antenna features three-dimensional omni-directional radiation with high radiation efficiency of 82.15% across the 60.06 GHz resonant frequency with gain 8.617dBi. Parametric studies were carried out by changing width, height, feedline, etc. for performance comparison. For the on-body scenario the antenna was put at five different distances from a torso phantom and a slight shift to the right of the resonant frequency was observed while the bandwidth was close to 30.068 GHz for each of these distances. Results indicate that the antenna is very efficient in both free space and on-body scenarios and is very suitable for the unlicensed 60 GHz band.
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Electrical and Computer Engineering
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North South University
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