Implanted Planar Inverted F-Antenna for Cardiac Pacemaker System

This paper proposed a PIFA with an artificial cardiac pacemaker for use of MICS. The calculation model is composed of the PIFA and the pacemaker embedded in the 2/3 muscle-equivalent phantom. The distance between the surface of the phantom and the antenna is changed and the model is numerically analyzed by use of the FDTD method. Numerical results show that as the distance d increases, the real part of the input impedance and the resonant frequency shift to the lower due to the high permittivity and conductivity of the human tissue. However, the proposed antenna resonates well at 402-405 MHz band when the distance d is 6, 9, 12 mm. According to the radiation characteristics, the maximum gain is about -28 dBi. Moreover, the antenna is fabricated and the input characteristic is measured in the developed 2/3 muscle equivalent phantom. The results show that the fabricated antenna works well at 400 MHz band. From these results, it is expected that the proposed antenna can be used as the implanted antenna for MICS.