In this paper, an antenna is presented for in-band full duplex technology. This antenna includes a microstrip patch and a new 180° hybrid coupler. The designed 180° hybrid coupler has new structure that miniaturizes the entire system and also eliminates the self-interference signal that leaks from transmitter to receiver. In this antenna, at 2.4 GHz, an isolation between transmit and receive ports is more than 79 dB. Additionally, in this antenna, the measured inter-port isolation is better than 68, 72, and 74 dB for 80, 50, and 20 MHz bandwidths respectively in 10 dB return loss impedance. The dimensions of the designed antenna are 68 mm × 60 mm, and in compare with similar designed antenna is considerably smaller (more than 60%) with acceptable isolation.

中文翻译：

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用于全双工通信系统的具有高端口间隔离的微型微带贴片天线

在本文中，介绍了一种用于带内全双工技术的天线。该天线包括一个微带贴片和一个新的 180° 混合耦合器。设计的180°混合耦合器具有新的结构，使整个系统小型化，同时消除了从发射器泄漏到接收器的自干扰信号。在此天线中，在 2.4 GHz 时，发射端口和接收端口之间的隔离度超过 79 dB。此外，在此天线中，在 10 dB 回波损耗阻抗下，对于 80、50 和 20 MHz 带宽，测得的端口间隔离度分别优于 68、72 和 74 dB。设计的天线尺寸为 68 mm × 60 mm，与类似设计的天线相比，体积要小得多（超过 60%），并且隔离度可以接受。