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Electronically Controlled Reconfigurable Antenna for Polarization Diversity


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DOI: https://doi.org/10.15866/irecap.v11i4.20258

Abstract


This article describes a novel design for implementing polarization reconfiguration in a simple patch antenna for Wireless Body Area Networks (WBANs) operating at 5.8 GHz industrial, scientific, and medical frequencies. The radiating patch is excited by a quarter-wave matched microstrip line in this structure. The cutting of two quadrilateral-shaped slots on the radiator divides the structure into a square radiating patch and two small triangular patches. Two diodes are embedded across the slot to connect or disconnect the triangular patch from the larger patch. Consequently, the antenna can be reconfigured between linear and Circular Polarization (CP). The antenna is simple and has a compact size of 27 mm × 20 mm × 1.6 mm. A prototype has been made and tested. The result reveals that the antenna produces circular polarization at 5.8 GHz with a good impedance bandwidth of 6.2% (5.56-5.93 GHz). In addition, it has an excellent axial ratio bandwidth of 2.8% (5.71-5.88 GHz). A human tissue model is used in the simulation in order to study the on-body performance of the antenna. The findings indicate that this design is advantageous for off-body communication and significantly improves the reliability of wireless systems.
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Keywords


Axial Ratio; Circular Polarization; Diodes; Patch Antenna; Quadrilateral Slots; Reconfigurable

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