Antipodal Vivaldi antenna with novel differentially fed structure for lowering cross-polarisation level

作者：Wang, Ya-wei^*

来源：Electronics Letters, 2017, 53(20): 1341-1342.

DOI：10.1049/el.2017.2266

• broadband antennas
• antenna feeds
• antenna radiation patterns
• vectors
• baluns
• strip lines
• antipodal Vivaldi antenna
• differentially fed double-slot structure
• cross-polarisation level
• metal layers
• E-field vectors
• wideband balun
• double-sided parallel stripline
• demanded differential feeding
• two-layer structure

A novel differentially fed double-slot structure with two metal layers is proposed for an antipodal Vivaldi antenna. When fed differentially, the slots can have their E-field vectors summed to an E-field vector parallel to the layers, which endows the antenna with a significantly lowered cross-polarisation level by comparison with a typical antipodal Vivaldi antenna whose E-field vectors in the slot are skewed to the layers. A wideband balun based on a double-sided parallel stripline is used to realise the demanded differential feeding. The simulation and measurement are carried out to validate the remarkable characteristic of a two-layer structure, which is simpler than a three-layer structure of a balanced antipodal Vivaldi antenna.

• 出版日期2017-9-28
• 单位中国人民解放军空军工程大学; 西安电子科技大学