摘要
针对超高频机载合成孔径雷达天线小型化、高增益和宽频带的问题 ,分析了短背射天线缩小背腔的增益损失。根据 pottel推算的公式 ,计算了馈源反射盘遮挡的增益损失。提出了用一种由宽偶极子构成的H型天线二元阵来取代短背射天线中的引向结构。指出了这种结构不仅能够提高天线增益、展宽频带还能缩小天线结构。比较了国内外小型超高频合成孔径雷达天线的结构。研究表明 ,利用宽偶极子和微带组阵能为有限平台提供重量轻、结构小、增益高和宽频带的超高频合成孔径雷达天线。
To meet the requirements of miniaturization, high gain and wideband of ultrahigh frequency (UHF) antenna for aircraft synthetic aperture radar (SAR), the gain loss produced by narrowing back cavity of short back radiation antenna is analyzed. Based on Pottel's formula, the gain loss due to the cover of reflective disk is calculated. A new approach is presented by applying the H-shape two-array antenna of wide dipoles to replace director structure of short backfire antenna. The new structure can not only improve gain and widen band, but also has a shorter antenna length. By a comparison of the existing structure of miniature UHF antennas for aircraft SAR, it is indicated that making use of wide dipole array can offer lightweight, small structure, high gain and wideband UHF antenna with the finite ground screen.
出处
《电波科学学报》
EI
CSCD
2004年第6期722-725,共4页
Chinese Journal of Radio Science
关键词
超高频
天线
小型化
高增益
Aircraft
Bandwidth
Frequencies
Gain control
Synthetic aperture radar
