In this communication, a compact saber-like antenna with low wind drag is proposed for on-board communication application, under the requirements of polarization diversity and omnidirectional coverage. The proposed antenna consists of a thin resonant cavity for omnidirectional horizontal polarization (HP), and a folded slot is colocated with the cavity to provide omnidirectional vertical polarization (VP). Isolation lower than −20 dB between two feeding ports is achieved in a quite compact dimension of $30 \times 29 \times 9$ mm³( $0.24\lambda _{0} \times 0.24\lambda _{0} \times 0.07\lambda _{0}$ , $\lambda _{0}$ is the free-space wavelength at 2.44 GHz), also with the omnidirectional patterns for both polarizations. A prototype of the proposed antenna is fabricated and tested to verify the design strategy. Compared with previous designs, the cross section area for wind drag is reduced for more than 28.5%, exhibiting potential usage for high-speed moving antenna carriers.

中文翻译：

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低风阻全向双极化军刀天线

在该通信中，在极化分集和全向覆盖的要求下，针对机载通信应用提出了一种具有低风阻的紧凑型军刀状天线。所提出的天线由一个用于全向水平极化 (HP) 的薄谐振腔组成，一个折叠槽与腔共置以提供全向垂直极化 (VP)。在非常紧凑的尺寸中实现了两个馈电端口之间低于 -20 dB 的隔离 $30 \times 29 \times 9$ 毫米³ ( $0.24\lambda _{0} \times 0.24\lambda _{0} \times 0.07\lambda _{0}$ , $\lambda _{0}$ 是 2.44 GHz 的自由空间波长），也具有两种极化的全向模式。制造并测试了所提出天线的原型，以验证设计策略。与之前的设计相比，风阻截面积减少了28.5%以上，展示了高速移动天线载体的潜在用途。