On The Design Of Miniaturized Implantable Serpentine Radiating Structures Using Strip Loading Method

Implantable antennas have shown novel developments in wireless body centric paradigm. Miniaturization concept in the antenna is key to its success as it provides compactness to the user. The design and development of implantable antenna also deals with other issues like biocompatibility, propagation, detuning effects, patient safety etc. Hence miniaturization techniques are incorporated with antenna to fulfill a tradeoff between size and performance. This work aims to examine the miniaturization techniques and performance evaluation available for body area network (BAN) antennas in ISM band. In this work we consider strip loading techniques with miniaturized profile suitable for medical application. Notably, strip loaded at the center of Complementary split ring resonator (CSRR) structure has high degree of miniaturization when fed by a directional microstrip line. Five types of low profile serpentine antennas integrated with CSRR structures have been consider for analysis of medical implantable devices. Analysis of these design structure indicated a strong relation of resonance frequency with antenna geometry and the position of loaded strip. Finally, the designed S-CSRR5 structure exhibited good response in terms of resonance, impedance matching and gain. Measurement results also showed good agreement with the simulated design.