Stacked implantable rectenna for wireless powering the medical implants

An implantable rectenna with stacked PIFA structure has been developed for wireless power transmission for medical implants in 402-405 MHz (MICS Band). The antenna has dimension of 450 mm³ measured operating frequency of 402 MHz with broad bandwidth of 50 MHz at return loss -10 dB. Experimental prototype of the compact stacked rectenna was fabricated on Roger 3210 substrate. The rectenna has a conversion efficiency of 80% is achieved when 2dBm microwave power is received at 402 MHz with 20K- Omega load.