The antenna measured 15 \(\times\) 15 \(\times\) 1.27 mm\({}^{3}\), was fabricated on a substrate called Roger 3010, and operated at 915 MHz, with a 10.6% operating bandwidth. The antenna was analyzed within the skin, and the values of the SAR were determined to be 517 W/kg, which was far higher than the figure proposed in this research. Other research [20] investigated a new broadband in-body antenna for biomedical uses at 915 MHz. The antenna's total dimensions were 3.14 \(\times\) 22.09 \(\times\) 1.27 mm\({}^{3}\), and the substrate material was Roger 3010, which had a thickness of 1.27 mm. At 915 MHz, the impedance bandwidth was 12.2%, and the realized gain was \(-\)32.8 dBi, and 778 W/kg was the SAR value. However, as compared to the suggested antenna in this study, this antenna had a larger dimension and a higher SAR value. An annular ring-shaped CP antenna with an axial ratio bandwidth of 19.1% was published in [21] for biomedical applications. This circular antenna also had two layered flexible substrates dubbed Roger 3010, each with a height of 0.635 mm. The antenna functioned in the ISM band at 2.45 GHz, with an operational bandwidth of 8%. The SAR values for this antenna were estimated at 508 W/kg, which was greater than the standard limit. The antenna had a max gain of \(-\)17.5 dB. The antenna was bigger than our suggested flexible implantable antenna, hence the bending analysis was not explored. A CPW-fed split-ring-resonator (SRR) = based implantable antenna for medical telemetry applications was shown in another work [22; 23]. The antenna's overall area was claimed to be 2422 mm\({}^{2}\), and the flexible substrate was Polyimide with a thickness of 0.07 mm. The antenna was designed to be low-profile and suitable for in-vitro testing. In comparison to our projected antenna, the antenna was still somewhat enormous. At 2.45 GHz, the antenna's realized gain and total operating bandwidth were stated to be \(-\)19.7 dB and 24.4%, respectively. This paper presents a high bandwidth with a small implantable antenna with a size of 7 \(\times\) 7 \(\times\) 0.254 mm\({}^{3}\) (0.027\(\lambda_{g}\)\(\times\) 0.027\(\lambda_{g}\)\(\times\) 0.0011\(\lambda_{g}\)) for medical applications, operating at the 915 MHz ISM band. The Rogers RT5880 substrate ( \(\epsilon_{r}\) = 2.2, tan \(\delta\) = 0.0009) is used in the design. At 915 MHz the 2D pattern of the design is broadsided directional both in \(E\)- and \(H\)-planes. Since the suggested design has a slotted ground plane, it has the potential to generate a broader bandwidth and lower antenna back-radiation into human skin tissues of a 25-mm\({}^{2}\) surface area. Due to the wideband designed structure, the stated antenna covers a wide spectrum at 915 MHz, with a very good peak gain value. Under the influence of the physical body, the created antenna's radiation efficiency and performance improves, while SAR values fall dramatically. This paper is divided into four sections. The first section introduces the applications and the literature of the previous work. It includes information on the planned research's history, the problem statement, aims, and importance. The suggested antenna's design analysis is covered in Section 2. The results and discussion are highlighted in Section 3, and the conclusion is described in Section 4.