Design of Ka-band Linear Tapered Slot Antennas Based on Substrate Integrated Waveguide Feed
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摘要:
在被动毫米波 (PMMW) 成像焦平面阵列 (FPA) 馈源的天线中，直线渐变缝隙天线 (LTSA) 相对于传统的喇叭天线、介质棒天线具有其独特的优势。该文优化设计了一种新型的对跖直线渐变缝隙天线 (ALTSA)，通过加载超材料结构使天线的增益得到了改善，天线采用基片集成波导 (SIW) 技术进行馈电。通过仿真与测试分析，该天线在较宽的频带内具有良好的阻抗特性、较低的副瓣电平及较高且平稳的增益，所设计的天线具有较小的口径宽度，在焦平面中易于组成较为密集的馈源阵列，以提高被动毫米波成像的空间分辨率。
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关键词:
- 天线 /
- 被动毫米波成像 /
- 对跖直线渐变缝隙天线 /
- 基片集成波导
Abstract:Linear Tapered Slot Antennas (TSA) have significant advantages over traditional horn antennas, dielectric rod antenna when used as feed elements in Focal Plane Arrays (FPA) of Passive MilliMeter Wave(PMMW) imaging. In this paper, a novel Antipodal Linear Tapered Slot Antenna(ALTSA) is designed and optimized. The proposed antenna, the gain of which is improved by loading metamaterial structure, is fed by the Substrate Integrated Waveguide(SIW). Simulation and measure analysis show that the good impedance characteristics, low sidelobe levels, high and smooth gain are all achieved in a wide frequency band. Meanwhile, the designed antenna has a smaller aperture width and is easier to form a denser feed array in the focal plane to improve the spatial resolution of passive millimeter wave imaging.
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表 1 天线结构尺寸(mm)
L L1 Lm Lt W Wm Wt WSIW 34 12 4 2.8 12 1.7 2.8 5 Wc Wd W1 p d d1 ${p_v}$ ${p_d}$ 0.34 0.34 0.7 1 0.7 1.3 0.15 2 
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