A novel approach to widening the active reflection coefficient(ARC)bandwidth of an antenna array,employing a parasitic coupling network(PCN),is investigated in this article.Different from traditional tightly coupled a...A novel approach to widening the active reflection coefficient(ARC)bandwidth of an antenna array,employing a parasitic coupling network(PCN),is investigated in this article.Different from traditional tightly coupled arrays adopting space structures for enhancing the coupling in balanced-excitation antennas,a PCN derived from rigorous formulas is employed in the feeding lines of unbalanced-excitation ones.Based on network analysis,the mutual coupling utilization condition for an(M×N)-element antenna array is initially deduced,and the PCN is implemented.Then,the PCNs are realized by introducing a parasitic element and a coupling network between the two-element H-plane and E-plane dual-layer coupled microstrip antenna arrays,resulting in 10.9%and 30.8%bandwidth enhancements compared with the original arrays,respectively.Moreover,the PCNs are further expanded to multielement antenna arrays,including three-and five-element one-dimensional and 8×2 twodimensional arrays,exhibiting approximately 40%overlapped ARC bandwidths with normal radiation patterns,steady gains,and applicable scanning characteristics.The results indicate its potential application in large-scale wideband arrays.展开更多
基金supported by the National Natural Science Foundation of China(Nos.62201579 and 62201580)the Youth Independent Innovation Science Foundation of National University of Defense Technology(No.ZK24-39)。
文摘A novel approach to widening the active reflection coefficient(ARC)bandwidth of an antenna array,employing a parasitic coupling network(PCN),is investigated in this article.Different from traditional tightly coupled arrays adopting space structures for enhancing the coupling in balanced-excitation antennas,a PCN derived from rigorous formulas is employed in the feeding lines of unbalanced-excitation ones.Based on network analysis,the mutual coupling utilization condition for an(M×N)-element antenna array is initially deduced,and the PCN is implemented.Then,the PCNs are realized by introducing a parasitic element and a coupling network between the two-element H-plane and E-plane dual-layer coupled microstrip antenna arrays,resulting in 10.9%and 30.8%bandwidth enhancements compared with the original arrays,respectively.Moreover,the PCNs are further expanded to multielement antenna arrays,including three-and five-element one-dimensional and 8×2 twodimensional arrays,exhibiting approximately 40%overlapped ARC bandwidths with normal radiation patterns,steady gains,and applicable scanning characteristics.The results indicate its potential application in large-scale wideband arrays.
