Wide-Angle Scanning Design of Irregular Arrays Based on Unequal Phase Feeding

被引:2
作者
Ma, Yankai [1 ]
Feng, Quanyuan [1 ]
Jin, Qiuyan [1 ]
Xiang, Qianyin [1 ]
机构
[1] Southwest Jiaotong Univ SWJTU, Sch Informat Sci & Technol, Chengdu 611756, Peoples R China
基金
美国国家科学基金会;
关键词
Phased arrays; Costs; Antenna arrays; Wideband; Prototypes; Delays; Delay lines; Irregular subarray; low thinned factor; unequal phase feeding; wide-angle scanning; wideband; PATTERN SYNTHESIS; SIDELOBE LEVEL; OPTIMIZATION; SUBARRAYS; BAND;
D O I
10.1109/TAP.2024.3372553
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The widespread application of irregular arrays is prevented due to their low gain and high sidelobe at large scanning angles. This article proposes a wide-angle scanning approach based on unequal phase feeding for irregular arrays. Through different phase feeding for elements in a subarray, the radiation vector is deflected, reducing the relative wavelength path distance. The proposed array realizes improved directivity and low sidelobes at large scanning angles, at the cost of a small reduction of directivity in the broadside. The method of symmetrical phase exchange achieves wideband capability, even though the unequal phase delay is frequency-dependent. A mixed-integer linear programming model is proposed for the design of irregular subarray partitioning and phase distribution. Simulation results show that the scanning range can be further extended from +/- 35 degrees to +/- 65 degrees compared with the state-of-the-art method. To demonstrate the feasibility of the proposed method, a prototype including an antenna array and divider networks is fabricated and measured. Measured results show that the realized gain (RG) of the proposed array exceeds that of the state-of-the-art array by about 4.0 dB at large scanning angles, at the cost of a 1.9 dB reduction in broadside gain at the highest frequency.
引用
收藏
页码:4129 / 4140
页数:12
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