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An Orbital Angular Momentum-Based Array for In-Band Full-Duplex Communications
摘要： A uniform circular array (UCA) with dual orbital angular momentum (OAM) modes is proposed for in-band full-duplex applications. The proposed scheme includes two concentric ring subarrays for transmitting and receiving, respectively, where all elements are operated under the same linear polarization. To suppress the self-interference resulting from the mutual coupling, an OAM mode-selection method related to the proposed configuration is discussed. Results indicate that good isolation performance between the transmitter and receiver can be achieved by using the proposed scheme. To validate the performance, a demonstrator with OAM modes of -1 and -2 at Ku-band is developed, fabricated, and measured. Measurements show a relative bandwidth of 21.3% from 13.5 to 16.7 GHz, referring to a 40-dB suppression level, is achieved and the desired radiations are found.
关键词： self-interference suppression,uniform circular array,full-duplex,mutual coupling,Orbital angular momentum
更新于2025-09-23 15:22:29
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Passive Self-Interference Suppression for Single-Channel Full-Duplex Operation
摘要： Full-duplex radios have become a topic of increased interest in the wireless communications community. As part of this development, many efforts were directed to passively decrease the self-interference level at the antenna outputs. However, in many proposed solutions transmis- sion and reception occur through different prop- agation channels. This article demonstrates and quantifies the negative impact of channel differ- entiation on pivotal applications of full-duplex radio, such as cognitive radio. Antenna designs used for self-interference suppression in full-du- plex radio architectures are analyzed. In order to ensure that transmission and reception occur within the same propagation channel, the use of the envelope correlation coefficient is proposed. The article aims to first define the problem and proposes a metric to quantitatively assess full-du- plex antenna designs. This is followed by anal- ysis and discussion of representative full-duplex solutions (i.e., their antenna and passive RF feed components) proposed in the literature. Finally, it is demonstrated for the first time that passive non-magnetic self-interference suppression comes at the cost of increased losses in the structure. A theoretical upper limit for the antenna efficiency is proposed. Its consistency is verified for three representative full-duplex antenna designs that are well documented in the literature.
关键词： cognitive radio,antenna efficiency,full-duplex radio,envelope correlation coefficient,self-interference suppression
更新于2025-09-11 14:15:04