A Dual-Band Four-Port MIMO Implantable Antenna with Enhanced Isolation

This paper presents the design and performance evaluation of a dual-band, four-port MIMO implantable antenna. The antenna demonstrates wide impedance bandwidths at the resonant frequencies of 433 MHz and 915 MHz. Port-to-port isolation is enhanced by connecting neutralization lines to the adjacent ground planes. Additionally, the antenna achieves pattern diversity due to the distinct radiation patterns of its individual elements. Link budget analysis confirms the suitability of the proposed antenna for high data rate biotelemetry applications.