Radiation-Pattern Reconfigurable Antenna for Medical Implants in MedRadio Band

The objective of this letter is to design a radiation-pattern reconfigurable antenna that operates at the Medical Device Radio communications Service band (MedRadio band: 401-406 MHz) for medical implants. By spiraling a monopole, an antenna miniaturization is accomplished. Two artificial switches are employed to perform a radiation-pattern reconfigurable property. The proposed antenna has dimensions of 28 mm×11.5 mm×0.6 mm (193.2 mm<sup>3</sup>) and utilizes substrate ( FR4 ε<sub>r</sub>=4.4). A one-layer skin model ( ε<sub>r</sub> = 46.74, σ = 0.69 S/m) is adopted for the antenna simulation and in vitro test.

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