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In this paper, a tapered slot antenna (TSA) for indoor wireless positioning at 2D coordinates is proposed. Three square slots and a semi-circular structure are added to the radiation element and the tapered aperture edge to obtain a high gain. The typical performance of the proposed antenna is analyzed by the voltage standing wave ratio (VSWR), the radiation pattern, and the realized gain. In order to verify the practicality of the indoor wireless positioning system at 2D coordinates, the fabricated TSA was connected to an NVA-R661 module developed by Xethru Inc. The impedance bandwidth result of the fabricated TSA has a wide bandwidth of 7.5 GHz by satisfying a VSWR ≤2 in a band of 4.5–12.0 GHz. Therefore, the radiation pattern indicated good directional characteristics, the maximum gain obtained is 8.92 dBi in the 9-GHz band. Finally, the target detection results of the indoor positioning system showed a minimum error of 3.27 cm and a maximum error of 16.33 cm, and thereby confirming the possibility of its use.

Analysis of Tapered Slot Antenna With High Gain for 2D Indoor Wireless Positioning