Internet of Things (IoT) applications have received massive attention in the previous decade. An antenna designed for such applications/devices needs to satisfy bandwidth requirement of concerned communication protocol whilst maintaining a near isotropic radiation pattern. This is important so that the device can communicate without effect from its orientation. The antenna also needs to provide sufficient gain, be small in size and weight for easy integration with the devices and ideally be low cost for feasible volume fabrication. This paper presents a Bluetooth 2.45 GHz Antenna-on-Package that satisfies all of the above-mentioned requirements and thus is suitable for IoT applications. The presented antenna has superior maximum gain (1.56 dB) and gain margin (5.05dB) compared to relevant designs in research literature and is fabricated using additive manufacturing technique. The presented design also considers the effect of components i.e. battery and Bluetooth chip in optimization model.