{"title":"A 2 × 2 pattern-diversity MIMO antenna with high isolation for full-duplex applications","authors":"Kyutae Park, Byung-Wook Min","doi":"10.1016/j.asej.2025.103577","DOIUrl":null,"url":null,"abstract":"<div><div>In this paper, a novel 2×2 MIMO full-duplex radio (FDR) antenna that incorporates dual-fed antennas and circulators with reflection-coefficient controllers (RCCs) is proposed. This system mitigates self-talk self-interference (SI) and cross-talk SI, which are significant challenges in MIMO FDR systems due to the increased number of antennas. The dual-fed antenna, designed for pattern diversity, introduces notches on the ground plane to cancel out two coupling paths, ensuring that the proposed antenna reduces the cross-talk SI. In addition, RCCs enhance limited isolation and adjust the isolation band of circulators by canceling out inherent leakage of the circulator and reflected signal from the antenna such that it reduces self-talk SI. With these two strategies, the proposed antenna covers a 180<sup>∘</sup> angular range and reduces the number of radiators. Measurements show that the proposed antenna achieves over 30-dB SI suppression for all SIs within the 3.6–3.7 GHz band, and the peak gains for both ports are 3.61 dBi.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 10","pages":"Article 103577"},"PeriodicalIF":6.0000,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ain Shams Engineering Journal","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2090447925003181","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper, a novel 2×2 MIMO full-duplex radio (FDR) antenna that incorporates dual-fed antennas and circulators with reflection-coefficient controllers (RCCs) is proposed. This system mitigates self-talk self-interference (SI) and cross-talk SI, which are significant challenges in MIMO FDR systems due to the increased number of antennas. The dual-fed antenna, designed for pattern diversity, introduces notches on the ground plane to cancel out two coupling paths, ensuring that the proposed antenna reduces the cross-talk SI. In addition, RCCs enhance limited isolation and adjust the isolation band of circulators by canceling out inherent leakage of the circulator and reflected signal from the antenna such that it reduces self-talk SI. With these two strategies, the proposed antenna covers a 180∘ angular range and reduces the number of radiators. Measurements show that the proposed antenna achieves over 30-dB SI suppression for all SIs within the 3.6–3.7 GHz band, and the peak gains for both ports are 3.61 dBi.
期刊介绍:
in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance.
Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.