Environment-Insensitive Loop-type Antenna for Reliable Implant-to-Implant Communication

Easy optimization, appropriate efficiency, and ro-bustness are the key challenges in implantable antennas' re-search. This paper presents the scalability analysis of a modified loop antenna, which shows insensitive behavior to implantation depth and variant dielectric environment. The proposed structure is optimized at two frequencies: 915 MHz and 2450 MHz. The antennas achieved fractional bandwidths of 3.1% and 15%, peak gains of -24.2 and -24.0 dBi, and radiation efficiencies of -30.1 and -30.3 dB. These characteristics together with the small geometry make the modified loop structure a suitable candidate for implant-to-implant communication.