**8. References**


Figure 13(c) presents that the bandwidth of the receiver antenna is from 400 MHz to 600 MHz for VSWR≤2. As a wave in air meets a medium of which relative permittivity is very high over air, much reflection is inevitably generated. So we designed the buffer layer having *εr* between air and human body for reducing the reflection, artificially. The buffer layer which is added a little bit loss is attached on the back of the proposed antenna for

Because of the requirement of medical test for GI tract, WCE came to the world. It solves many restrictions on exploring GI tract. With the development from 2001, WCE has become a promising device with suitable requirement. It has image sensor and lighting, control unit, wireless communication unit, power source, and mechanical actuator. The system can be operated outside the human body, the size of the capsule endoscope system is smaller, and the interconnection between devices was optimized, power consumption also reduced with technology optimized. Some companies and individual are still studying on new functions

For wireless capsule endoscopy antenna, several basic standards and situation of operation in human body were discussed. The signal transmission efficiency of the antenna will directly decide the quality of the received real-images and rate of power consumption. Because of the lossy material absorbs a number of waves and decreasing the power of receiving signal, human body presenting strong negative effects on the microwave propagation. Wireless capsule endoscopy transmitting antenna is for sending out the detected signal inside human body and receiving antenna receive the signal outside human body. Several transmitting antennas are introduced in this article. The two fundamental types of transmitting antenna are the spiral antennas and conformal antennas both feature as the small physical size, relatively large bandwidth, omni-directional pattern and polarization diversity. The receiving antennas operating outside of human body are also discussed, such as the narrow bandwidth antenna for receiver, microstrip meandered planar antenna and the receiver antenna with buffer layer. All of them operate well outside the

This work is supported by the Natural Science Foundation of Jiangsu province (No. BK2010251 and BK2011352), Suzhou Science and Technology Bureau (No. SYG201011), and

American Cancer Society, (2010). Key statistics about cancers, *Official website of American Cancer Society*, access at Oct. 1st, 2010. <http://www.cancer.org/Cancer/index> Babar, A. et al., (2009). Miniaturized 433 MHz antenna for card size wireless systems,

*Proceeding of Antennas and Propagation Society International Symposium (APSURSI),* 

reducing a size of antenna and back lobe power.

**6. Conclusions** 

and optimization.

human body.

**8. References** 

**7. Acknowledgement** 

XJTLU Research Develop Fund (No. 10-03-16.).

*2009 IEEE*, Charleston, June, 2009.


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