A millimeter-wave radial line slot antenna fed by a rectangular waveguide through a ring slot
A millimeter-wave radial line slot antenna fed by a rectangular waveguide through a ring slot
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矩形波导通过环形缝隙馈电的毫米波径向线缝隙天线
DOI：
10.1109/aps.2001.959701
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Ando
中科院分区：
文献类型：
--
作者：
K. Sudo;A. Akiyama;J. Hirokawa;M. Ando
径向线缝隙天线（RLSA）是一种高增益、高效率的平面天线，适用于12 GHz频段的DBS用户。近年来，已经在毫米波段中开发了若干无线电系统。在传统的RLS中，径向波导由同轴馈线馈电。在毫米波段，由于物理尺寸小，馈线的制造相当困难。需要高制造精度以提供高天线效率。我们已经提出了一种具有环形槽和微带线的平面馈电电路（参见Kigure，Y.例如，IEICE Natl. Conv.建议：B-1-102，1999）。馈电电路可以容易地与RF平面电路集成。然而，在这种结构中，对天线背面的不期望的辐射是显著的，并且天线效率降低。在毫米波段的效率方面，矩形波导对于馈送径向波导更有吸引力。提出了一种通过环形缝隙实现矩形波导到径向波导的转换器Transformer。这种Transformer体积稍大，但没有泄漏。它适合与现有的RF模块集成，这些模块具有到矩形波导的接口。设计并制作了12 GHz频段的环形缝隙矩形到径向波导变换器（Transformer），并在38 GHz频段将RLSA与该馈电电路集成。
A radial line slot antenna (RLSA) is a high gain and high efficiency planar antenna proposed for DBS subscribers in the 12 GHz band. In recent years, several radio systems have been developed in the millimeter wave band. In conventional RLS, a radial waveguide has been fed by a coaxial feeder. In the millimeter wave band, fabrication of the feeder is considerably difficult, since the physical size is small. High accuracy in manufacturing is needed to give high antenna efficiency. We have proposed a planar feed circuit with a ring slot and a microstrip line (see Kigure, Y. et al., IEICE Natl. Conv. Rec., B-1-102, 1999). The feed circuit may be easily integrated with an RF planar circuit. In this structure, however, undesired radiation to the back of the antenna is significant and the antenna efficiency is degraded. In terms of efficiency in the millimeter wave band, a rectangular waveguide is more attractive for feeding a radial waveguide. A rectangular-to-radial waveguide transformer through a ring slot is proposed. This transformer is slightly bulky, however there is no leakage. It is suitable for integrating with existing RF modules that have an interface to the rectangular waveguide. The rectangular-to-radial waveguide transformer through a ring slot is designed and fabricated at the 12 GHz band and we integrate a RLSA with this feed circuit at the 38 GHz band.