volume | PIER Journals

Abstract

This study introduces a compact, dual-band wearable slot antenna with inverted L-shaped partial ground (PG) for Wireless Local Area Networks (WLANs) and X-Band Applications. The proposed antenna design uses a flexible polyamide material of 21×21 mm² dimensions as a dielectric substrate between two metal surfaces. The prime radiator is a rectangular slot antenna patch with several slots etched out, and the ground plane is an inverted L-shaped stub that forms the PG. The insertion of slots in the patch disturbs the surface current path and increases the electrical length to offer miniaturizations. It effectively minimizes the antenna dimensions to resonate at lower frequencies. The dimensions of the PG and its placement on the ground plane attain the dual-band resonance with a good amount of return loss. Different slots are etched on the patch to get the desired frequency bands of operation. The designed antenna has achieved wide impedance bandwidths of 0.55 GHz and 1.04 GHz and peak gains of 6.45 dBi and 6.04 dBi at the 5.15 GHz and 8.13 GHz operating frequencies, respectively. The detuning behavior of the suggested antenna in bending conditions is analyzed. The effect of radiation on the human tissue is calculated in terms of Specific Absorption Rate (SAR), and it is within the standards. The antenna model is fabricated and tested, and a satisfactory agreement between the computed and measured data is achieved. The compactness, flexibility, and radiation pattern make this antenna model suitable for ON/OFF-Body communication in wearable applications.

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Dr. Nageswara Rao Regulagadda

Prof. Uppalapati Venkata Ratna Kumari