In this study, a multi-slotted antenna is designed and characterized that can be used for wearable applications by utilizing a flexible, durable silicone rubber substrate. Flexible material has become increasingly popular among researchers in recent years for the development of wearable antennas for body area networks (BAN). The flexible device should be small in size so that it can be easily worn on the human body by integrating with wearables for transmitting and receiving signals over a sufficiently long distance. Unlike conventional flexible and semi-flexible substrate, presented work utilize silicon rubber substrate owing the advantages of good thermal stability and good resistance in varying environmental conditions. The designed antenna's surface offers a compact size of 14 × 12 mm² with a thickness of 2 mm. The resonance frequency of the designed antenna is optimized at 5.8 GHz with a peak gain of 2.46 dBi. The specific absorption rate (SAR) achieved for the proposed antenna is 1.56 W/kg for 1 g of tissue which fulfills the FCC standard. The design offers radiation efficiency of around 80 % when loaded with hand model over the operational band of 5.5 GHz-6.5 GHz. The bending characteristics of multi-slotted antenna are also analyzed, which offers stable performance as compared to antenna without any bend. Compactness as well as high radiation efficiency have been accomplished that makes the proposed antenna a strong candidate for military applications, medical applications, GPS, RFID, and fitness tracking.

A performance comparison of brain tumor detection using different antenna substrate materials, such as natural rubber and silicon rubber substrates, is highlighted here. This paper analyzes the impact of these substrates on the designed microstrip patch antenna. Substrates made of silicon and natural rubber with the same relative permittivity were considered for the analysis. To improve performance of the antenna, a ground plane having circular Electromagnetic Band Gap (EBG) is provided and is simulated through HFSS software. The proposed antenna measured and compared the gain, return loss, and specific absorption rate (SAR) of these materials.

• Brain tumors are presented with emphasis on their types, diagnostic challenges, and the necessity of early detection. • Antenna technology in medical imaging is reviewed with focus on its evolution, role in brain tumor detection, and associated advantages and limitations. • Key antenna design considerations for brain tumor detection are outlined, including frequency selection, size and configuration, material choice, and signal processing integration. • Future directions and challenges are highlighted, addressing microwave imaging antennas, ultra-wideband systems, RF coils for MRI, and other emerging technologies.

Medical telemetry systems are used by patients who are observed in an intensive care unit (ICU) following a surgical procedure. The patient's vital parameters such as blood pressure, blood sugar, heart rate, temperature, and oxygen saturation are continuously monitored through a cloud platform by medical experts. The main challenges in the adoptability of these devices are compactness and flexibility since it is a body-worn device. The proposed system was created by employing low-power dedicated sensors such as body temperature and heart pulse rate to provide telemetry support to facilitate faster and better medical actions in emergencies. A miniaturized silicon rubber-based flexible antenna having 2.17 dBi gain, 92.61% efficiency and 0.06-0.98 W/Kg SAR is connected to a medical telemetry system and the signal strength is analyzed with that of the ceramic and meander line stock antenna. The stock antenna gave a signal strength between -58 dBm and -47 dBm whereas the flexible antenna gave -17 dBm when analyzed with other Wi-Fi channels of the same frequency.