電磁最佳化實驗室EM Optimization LabYen-Sheng Research Group, Department of Electronic Engineering

An information recording system enabled by Bluetooth communication is proposed. The proposed system consists of three major parts: a bracelet, a smart phone, and a recording APP. A switch sensor and a four-element planar array are mounted on the bracelet; by triggering the switch sensor, the Four-element planar array, which operates in a wide bandwidth between 1.8 GHz to 2.7GHz, will transmit the triggering signal to the Android smart phone which installs the recording APP. That is why it not only can operate in Bluetooth communication frequency band (2.402–2.480 GHz), but also regulates the effects caused by environmental elements. After that, the recording APP is able to record the information such as voices, pictures, and videos without being noticed. To sum up, there are two innovations in this project. First, this information recording system enabled by Bluetooth communication is a practical and brand new system. Second, this project successfully develops a four-element planar array which operates with a wide bandwidth and depicts a greater communication distance as compared to the conventional chip antenna.