This paper aims to design a semi-circular patch microstrip antenna that can work at a frequency of 2. 4 GHz (band 2360 MHz - 2400 MHz) to support Wireless Body Area Network technology (WBAN). One of the devices connected to WBAN technology is a Holter monitor and medical data recorder that forms a medical network for post-operative or monitoring ICU patients (Intensive Care Unit). https://parisnaturalfoodes.shop/product-category/arnica-massage-oil/