微帶線-槽線饋電縫隙等角螺旋天線設(shè)計(jì)
[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.
【作者單位】: 哈爾濱工業(yè)大學(xué)電子與信息工程學(xué)院;哈爾濱工業(yè)大學(xué)(威海);
【基金】:國(guó)家自然科學(xué)基金(61171181)資助課題
【分類號(hào)】:TN823.31
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