Performance variation in electrical balance duplexers due to user interaction
Performance variation in electrical balance duplexers due to user interaction
复制标题
由于用户交互而导致电平衡双工器的性能变化
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
J. Haine
中科院分区：
文献类型：
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作者：
L. Laughlin;M. Beach;K. Morris;J. Haine
影响电平衡双工器（EB）中的发射到接收（TX-RX）隔离的关键问题是通过平衡网络动态匹配天线阻抗。包括嵌入式天线测量的电路仿真已被用于研究由于与用户和本地环境的交互而导致的TX-RX隔离的变化。在847 MHz和1960 MHz下的仿真结果表明，用户交互导致20 MHz带宽上平均隔离度的变化超过25 dB。然而，在反射室内环境中，用户交互平均提高了TX-RX隔离。这种观察到的性能改进是天线辐射效率降低的结果，这使得来自较长距离处的物体的反射不太显著，从而减少了天线反射系数的频域变化。
A key issue impacting the transmit to receive (TX-RX) isolation in Electrical Balance (EB) Duplexers is dynamic matching of the antenna impedance by the balancing network. Circuit simulations including embedded antenna measurements have been used to investigate the variation in TX-RX isolation due to interaction with the user and the local environment. Simulated results at 847MHz and 1960MHz show user interaction causes over 25dB of variation in the mean isolation over a 20MHz bandwidth. However, in reflective indoor environments, user interaction on average improves TX-RX isolation. This observed performance improvement is a result of reduced antenna radiation efficiency, which makes reflections from objects at longer ranges less significant and thereby reduces frequency domain variation in the antenna reflection coefficient.