Design of a miniaturized UWB ingestible antenna for Wireless Capsule Endoscopy

In recent years, non-invasive Wireless Capsule Endoscope (WCE) has been explored extensively for the diagnosis of GI tract diseases. However the application of WCE is limited due to capsule size, propagating efficiency of the antenna, reducing effects on the human body and the data rate of the telemetry system. In this paper a miniature Ultra-wideband (UWB) antenna is designed for WCE by exploiting several miniaturization techniques such as using high-permittivity dielectric substrate and lengthening of the current flow path on the patch surface. The volume of the optimized antenna is only 81 mm³. The performances of the antenna are investigated inside a homogeneous human muscle layer. The proposed antenna resonates at 8.36 GHz with a wide -10 dB bandwidth of 500 MHz. Maximum power of 21.115 mW can be set as input to the proposed antenna in order to comply with the IEEE C95.1-1999 safety standards.