A Compact Ultrawideband Planar Antenna for a Biomedical Application

Wireless Capsule Endoscopy (WCE) is one of the biomedical applications that shows a tremendous prospect in recent years due to its non-invasive procedure. However the major challenges of today's WCE include capsule size and bandwidth of transceiver system. The objective of this paper is to design a miniature antenna operating in UWB range. Several antenna miniaturization techniques and bandwidth enhancement techniques are introduced for the antenna design. The dimension of the proposed antenna is 10 mm × 10 mm × 0.82 mm. The designed antenna has been evaluated inside a homogeneous human body model. The wide -10 dB bandwidth of the antenna is 3.91 GHz starting from the frequency of 3.54 GHz to 7.45 GHz. It shows omnidirectional radiation patterns. For comply with IEEE C95.1-1999 safety standards, maximum threshold limit of the input power of the proposed antenna is found to be 3.13mW.