| Summary: | 碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 97 === The popularity of wireless transmission technology has improved the efficiency of communication and information in daily life. The radio frequency transmission provides the conveniences and the feasibility of environment, that helps to reduce the cost the system setup for information technologies in industries such as storage management, biomedical technology, logistics control, and security monitor. However, wireless radio frequency device is not perfect and omnipotent; there are some disadvantages and limitations. RFID as an example, metal, water and operating frequencies are the interference factors while the Reader retrieve data from Tag.
In recent years, RFID is more widely used in biomedical device applications. The human body contains 70% of water, this is an important factor that can not be ignored because the water molecules absorb radio waves and malfunction to implantable biomedical devices. The simulation experiment of radiofrequency transmission via finite difference time domain method (FDTD) is conducted in this study to analyze humidity effects under various environments and adjust its transmission power and frequency to achieve the maximum efficiency of receiver and best SAR performance.
The results of this study will provide information of the radio frequency performance associated with various harshness environments; these references will be helpful for implantable biomedical devices and reduce the harm of over powered electromagnetic waves or under performance by too weak signals.
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