A frequency-reconfigurable wearable textile antenna with one-octave tuning range
Date
2021
Authors
Dang, Q.H.
Chen, S.J.
Ranasinghe, D.C.
Fumeaux, C.
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Journal article
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IEEE Transactions on Antennas and Propagation, 2021; 69(12):8080-8089
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Quoc Hung Dang, Shengjian Jammy Chen, Damith Chinthana Ranasinghe and Christophe Fumeaux
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Abstract
A reconfigurable wearable textile antenna with wide frequency tuning range is demonstrated in this work. Frequency agility is realized by adding a coplanar reconfiguration module to a planar inverted-F antenna (PIFA) constructed in textile technology. The reconfiguration module consists of a small flexible printed circuit board (PCB) which integrates a tuning circuitry with commercial snap-on buttons as electronic-to-textile connectors. Using this module equipped with a varactor diode, the frequency reconfigurability of the PIFA is investigated and optimized parametrically for maximum tuning range, exploiting a smooth transition from a quarter-wave to a half-wave patch resonant mode. A fabricated prototype demonstrates a very wide tuning range of approximately 70% (or one octave) with stable directive radiation characteristics, as predicted by simulations. The robust performance and mechanical stability of the reconfigurable antenna in various on-body and bending configurations validates the viability of the antenna tuning concept and the practicality of the proposed coplanar reconfiguration module.
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