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Characteristic Mode Analysis and Design of Wide Band MIMO Antenna Consisting of Metamaterial Unit Cell
摘要： This paper presents a full wave simulation and characteristic mode-based design of a multiple-input-multiple-output (MIMO) antenna at 5.8 GHz for wireless local area network applications. The driven analysis comprises two antennas that are placed orthogonal to each other. A metamaterial unit structure in the form of a rectangular loop resonator is placed around the antenna element to reduce the electromagnetic interference and to increase the isolation between the two monopoles. A characteristic mode technique is employed to find out the dominant mode of the proposed antenna without a feeding port. It was revealed that mode 1 was the dominant mode among the three modes used. The MIMO antenna is constructed and measured using a vector network analyzer. A good isolation of less than 25 dB was attained with a wide impedance bandwidth of 65.5%.
关键词： rectangular loop resonator,multiple-input-multiple-output (MIMO),envelope correlation coefficient,mutual coupling
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
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Wideband Multi-Beam Yagi based MIMO Antenna System with Multiple Parasitic Directors
摘要： A proof of concept design for splitting the single conventional beam of a Yagi antenna into multiple beams is presented by exciting the 3λg loop resonating mode as well as using multiple director elements. The proposed multiple-input-multiple-output (MIMO) antenna system is designed in a triangular con?guration, so that the adjacent beams do not cancel the effect of each other and to achieve orthogonal radiation patterns each covering 120o sector. The design has a minimum measured -10 dB bandwidth of 980 MHz (5.66-6.64 GHz) targeting the WLAN band. The board diameter of the MIMO antenna system is only 120 mm. It has a minimum front-to-back ratio (FBR) of 10 dB, gain of 3.8 dBi, and ef?ciency of 92%. The proposed MIMO antenna system has high port isolation of 30 dB and low envelope correlation coef?cient (ECC) value of 0.012 in the entire band of operation between all its elements.
关键词： port isolation,envelope correlation coefficient,MIMO,front-to-back ratio
更新于2025-09-04 15:30:14