Polygonal Driver Dipole Antenna for Wireless Medical Telemetry Service

This work presents a polygonal driver dipole antenna with a triangle impedance taper. The proposed polygonal driver carves many discontinuities along the surface of a typical fat driver to improve characteristics of antenna. In addition, this work proposes the triangle impedance taper that is designed to function as a balun, to match impedance transformation between an unbalanced and a balanced transmission line. The overall configuration comprises the polygonal driver, a coplanar waveguide to coplanar strip line, and the triangle impedance taper. Therefore, the antenna effectively matches the antenna impedance and enhances the operation frequency bandwidth. Measurement results demonstrate that the proposed antenna obtains a triple frequency band of 1800 MHz (1.1 – 2.9 GHz) and 170 MHz (4.9 – 5.07 GHz), and 590 MHz (6.07 – 6.66 GHz). Also, it achieves a realized peak gain of 4.0 – 5.8, 6.4 – 7.5 dBi, and generates circular polarization. Owing to its compact structure and multi-band performance, the antenna is well-suited for wireless medical telemetry systems (WMTS) applications.