College of Information and Communication Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Korea.
Mobile Communication Division, Samsung Electronics Ltd., 129 Samsung-ro, Yeongtong-gu, Suwon, Gyeonggi-do 16677, Korea.
Sensors (Basel). 2018 Jun 30;18(7):2103. doi: 10.3390/s18072103.
This paper presents a new antenna proximity sensor for mobile terminals based on the measured reflection coefficient using a bidirectional coupler which is positioned between the main antenna and the front-end module. Using the coupled forward and reverse long-term evolution signals by the bidirectional coupler, the reflection coefficient looking into the antenna was calculated in the base-band processor. The measured reflection coefficients showed clear differences for both the types of objects, and the distances between the terminal and the objects. The proposed antenna proximity sensor showed a recognition distance that was approximately 5 mm longer than that of a conventional capacitive proximity sensor.
本文提出了一种基于使用放置在主天线和前端模块之间的双向耦合器测量反射系数的新的移动终端天线接近传感器。通过双向耦合器耦合正向和反向长期演进信号，在基带处理器中计算出天线的反射系数。测量的反射系数对于两种类型的物体以及终端和物体之间的距离表现出明显的差异。所提出的天线接近传感器的识别距离比传统的电容接近传感器大约长 5 毫米。
