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A textile, embroidered antenna, based on the fractal shape of the Sierpinski triangle, is designed in this paper for operation in the European free Industrial Scientific and Medical (ISM) 863–870 MHz band, as well as in the 902–928 MHz band designated for ISM applications in North and South America. Several prototypes have been fabricated by employing different stitch patterns and thread materials. The effect of the fabrication parameters on the performance of the proposed antenna is investigated through measurements and simulations, with the results being in good agreement. The antenna exhibits attractive characteristics such as wide bandwidth, relatively stable radiation patterns, as well as robustness in washing. Several tests reveal that convex and concave bent conditions do not affect the coverage of the aforementioned ISM bands, despite the shift of the resonant frequency in some cases. Moreover, the SAR values resulting from simulations are below the corresponding thresholds suggested by international guidelines.
Theodoros N. Kapetanakis; Martin Pavec; Melina P. Ioannidou; Christos D. Nikolopoulos; Anargyros T. Baklezos; Radek Soukup; Ioannis O. Vardiambasis. Embroidered Βow-Tie Wearable Antenna for the 868 and 915 MHz ISM Bands. Electronics 2021, 10, 1983 .
AMA StyleTheodoros N. Kapetanakis, Martin Pavec, Melina P. Ioannidou, Christos D. Nikolopoulos, Anargyros T. Baklezos, Radek Soukup, Ioannis O. Vardiambasis. Embroidered Βow-Tie Wearable Antenna for the 868 and 915 MHz ISM Bands. Electronics. 2021; 10 (16):1983.
Chicago/Turabian StyleTheodoros N. Kapetanakis; Martin Pavec; Melina P. Ioannidou; Christos D. Nikolopoulos; Anargyros T. Baklezos; Radek Soukup; Ioannis O. Vardiambasis. 2021. "Embroidered Βow-Tie Wearable Antenna for the 868 and 915 MHz ISM Bands." Electronics 10, no. 16: 1983.
A modular beamformer, fully scalable in amplitude and phase, to be used with transmitting antenna arrays operating in the Digital Cellular System (DCS)/Personal Communications Service (PCS) frequency band, is designed and fabricated in this paper. The implementation of the structure is simple and very low cost; its performance is evaluated by measuring the frequency response, as well as the radiation patterns produced by an antenna array connected to the output of the beamformer. The latter exhibits low return losses and average amplitude imbalance less than ±0.8 dB, whereas the phase deviations do not exceed ±6° on average, over its 300 MHz bandwidth.
George A. Adamidis; Ioannis O. Vardiambasis; Melina Ioannidou; Theodoros N. Kapetanakis. Design and implementation of an adaptive beamformer for phased array antenna applications. Microwave and Optical Technology Letters 2019, 62, 1780 -1784.
AMA StyleGeorge A. Adamidis, Ioannis O. Vardiambasis, Melina Ioannidou, Theodoros N. Kapetanakis. Design and implementation of an adaptive beamformer for phased array antenna applications. Microwave and Optical Technology Letters. 2019; 62 (4):1780-1784.
Chicago/Turabian StyleGeorge A. Adamidis; Ioannis O. Vardiambasis; Melina Ioannidou; Theodoros N. Kapetanakis. 2019. "Design and implementation of an adaptive beamformer for phased array antenna applications." Microwave and Optical Technology Letters 62, no. 4: 1780-1784.