Along this document, an implantable microstrip antenna design is introduced for biomedical telemetry in Medical Implant Communications Service (MISC, 402-405 MHz) band. The radiating layer of the antenna is composed of two concentric square split-ring elements and a metallic pad placed between them. Also a shorting-pin is directly connects the outer ring element to the ground plane. It is numerically demonstrated that the proposed antenna offers approximately 7% impedance bandwidth and a gain of 1.4 dBi at the designated frequency band. Also affects of some antenna parameters are examined in the paper. Note that, the full-wave analyses of the implant antenna are carried out using CST Microwave Studio, utilizing the time-domain finite-integration technique.