The UHF band in-body antennas for wireless capsule endoscopy
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Wireless Capsule Endoscopy (WCE) has conquered several limitations of traditional diagnostic tools, such as the cable discomfort and the inability to examine the convoluted intestinal regions. However, this technique requires further improvement before it can be implemented. Antenna plays a major role in transmitting and receiving signals in such a system. Transmission efficiency of the antenna determines the quality of images received in real-time. This paper reviews the state-of-the-art WCE transmitting antennas focusing on the design and analysis issues. Extensive investigations are carried out on the development of WCE antennas from the past to the present in two parts. First, the WCE antenna designs including embedded and conformal antennas are introduced and reviewed. Then, two new ideas (case studies) for the design of WCE antenna with about 400MHz bandwidth and omni-directional radiation patterns are introduced, which satisfy the system requirements for WCE. This paper also presents the challenges and prospective of WCE in the future.
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