一种应用于平方公里中频阵的八角环天线阵

doi:10.16180/j.cnki.issn1007-7820.2019.01.006

摘要/Abstract

摘要：

结合平方公里中频孔径阵列的应用场景,文中提出了一种基于电阻膜频率选择表面的超宽带八角环天线单元。其通过在八角环天线阵列与接地板之间加载方环形电阻膜频率选择表面,对由金属地板在对应频点因反相叠加而产生的驻波峰值有效抑制,进而拓宽了天线带宽以及降低了天线剖面。仿真结果表明:加载电阻膜频率选择表面后,天线阵元最终在±45°扫描范围内获得了5:1的阻抗匹配带宽,且天线的剖面降低了约27%。此外,在整个工作频带内天线阵元具有稳定的有源方向图、较宽的半功率波瓣宽度以及较好的极化性能。

关键词: 平方公里阵, 中频孔径阵列, 八角环天线单元, 超宽带, 双极化, 电阻膜频率选择表面

Abstract:

Combined with the application scenarios of square kilometer array, an ultra-wideband octagonal ring antenna element based on the resistive frequency selective surface was presented. The standing wave protrusion caused by the reverse phase superposition of the reflection plate at the corresponding frequency point could be effectively suppressed by inserting a square ring resistive frequency selective surface between antenna array and ground plane, which greatly improved impedance bandwidth and reduced the profile of antenna array. Simulation results indicated that based on the resistive frequency selective surface, a 5:1 impedance matching bandwidth was obtained within the ±45° scanning range. At the same time, the profile of the antenna had been also reduced by about 27%. In addition, the antenna element had a stable active pattern, wide half-power lobe width and good polarization performance over the entire operating band.

Key words: square kilometer array, mid-frequency aperture array, octagonal ring antenna element, ultra-wideband, dual-polarization, resistive frequency selective surface

中图分类号:

TN821.8

卢保军. 一种应用于平方公里中频阵的八角环天线阵[J]. 电子科技, 2019, 32(1): 27-31.

LU Baojun. Design of an Octagonal Ring Antenna Array Applied to Mid-Frequency Aperture Array of Square Kilometer Array[J]. Electronic Science and Technology, 2019, 32(1): 27-31.

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参考文献 16

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参数	D	L	t_ssub	r₁	k₁	d
数值	80	80	50	17.5	0.6	5
参数	r₂	k₂	i	j	g	G
数值	15.75	0.8	1.5	0.3	0.3	2.4

	0°	E-45°	H-45°	剖面
未加载 RFSS	0.21~0.98 GHz	0.21~0.35 GHz		130 mm
		0.51~1.13 GHz	0.21~1.13 GHz
加载 RFSS	0.28~1.5 GHz	0.26~1.54 GHz	0.3~1.8 GHz	95 mm

频率/GHz	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1	1.1	1.2	1.3	1.4	1.5
2θ₀_.₅_E/(°)	129.3	129.1	126.6	124.7	122.6	120.1	117.7	115.3	111.8	109.1	105.0	101.8	99.1
2θ₀_.₅_H/(°)	129.3	129.1	126.6	124.7	122.6	120.2	117.7	115.3	111.8	109.1	105.0	101.8	99.1
前后比/dB	-30.4	-30.4	-30.4	-30.4	-30.5	-30.5	-30.5	-30.4	-30.4	-30.5	-30.6	-30.6	-30.6
交叉极化/dB	-18.1	-21.6	-23.0	-21.9	-20.5	-19.2	-18.2	-17.4	-16.8	-16.2	-14.8	-10.5	-5.2