微带线-槽线馈电缝隙等角螺旋天线设计

发布时间：2018-08-27 15:46

【摘要】：被动雷达导引头为探测与跟踪目标可采用宽带等角螺旋天线,针对降低等角螺旋天线剖面,该文提出一种低剖面背腔式微带线-槽线馈电缝隙等角螺旋天线。微带线-槽线巴伦(Balun)中渐变微带线将同轴线激励的不平衡电场最终转化为槽线处平衡电场。实测结果表明,该缝隙等角螺旋天线实现了1:9的电压驻波比(VSWR)带宽,良好的辐射方向图与圆极化特性。在天线背面加入高度仅有0.05L l(L l为最低工作频率所对应自由空间中波长)的反射腔,腔内放置矩形环状吸波材料,有效拓展了天线低频段带宽。测试结果表明带有反射腔的缝隙等角螺旋天线实现了1:6.4的电压驻波比带宽,天线增益大于4 dB,良好的圆极化与方向图特性。平面化、一体化的馈电方式与低剖面反射腔有效降低了缝隙等角螺旋天线剖面,测试结果验证了该文所提出的微带线-槽线巴伦馈电缝隙等角螺旋天线设计方法的有效性。
[Abstract]:The passive radar seeker can use wide-band equiangular helical antenna for detecting and tracking targets. In order to reduce the profile of the isobaric helical antenna, a low-profile back-cavity microstrip line-slot feed slot isobaric helical antenna is proposed in this paper. The unbalance electric field excited by coaxial line is transformed into equilibrium electric field at slot line by gradient microstrip line in (Balun) of microstrip line and slot line. The measured results show that the slot isobaric helical antenna achieves 1:9 VSWR (VSWR) bandwidth, good radiation pattern and circular polarization characteristics. A reflection cavity with a height of 0.05L l (L l as the minimum operating frequency corresponding to the wavelength in the free space is added on the back of the antenna, and a rectangular ring absorbing material is placed in the cavity, which effectively expands the bandwidth of the antenna in the low frequency band. The test results show that the slot equiangular helical antenna with reflection cavity achieves the VSWR bandwidth of 1: 6.4, and the antenna gain is greater than 4 dB, with good circular polarization and pattern characteristics. The planar, integrated feed mode and the low profile reflection cavity effectively reduce the slot equiangular helical antenna profile. The test results verify the effectiveness of the proposed design method of microstrip line-slot Baron feed slot equiangular helical antenna.
【作者单位】：哈尔滨工业大学电子与信息工程学院;哈尔滨工业大学(威海);
【基金】：国家自然科学基金(61171181)资助课题
【分类号】：TN823.31

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