一种低方向性的球形共形全向天线阵列设计

传统的球形共形天线阵列馈电网络复杂,每个天线单元需要单独馈电和控制相位,导致天线阵列效 率较低。文中提出了一种采用口径耦合馈电的单馈球面共形全向天线阵。为球形天线阵列设计了一个1 分30 的馈 电网络且直接集成在了阵列内部。这样可以通过一个端口给所有的天线单元馈电,从而降低了馈电的复杂度,提高 了天线效率。阵列的方向图在x-y 平面上是全向的。x-y 平面的增益变化小于1 dB,x-z 平面的半功率波瓣宽度约为 120°,实现了比传统全向更大的空间覆盖范围。天线的方向图最大增益为1 dBi。

Design of an Omnidirectional Spherical Antenna Array with Extreme Low Directivity for Conformal Applications

The conventional spherical conformal antenna array has a complicated feed network, each antenna element needs to be individually fed and controlled in phase, resulting in lower antenna efficiency. In this paper, we propose a single- fed spherical conformal omnidirectional antenna array, which adopts the aperture coupling feeding method. A 1-to-30 feeding network is designed for the spherical array. In this way, we can feed all antenna elements through one port, which reduces the complexity of the feeding and improves antenna efficiency. The direction pattern is omnidirectional on the x-y plane. The gain variation of the x-y plane is less than 1 dB, and the x-z plane has a half-power beam-width (HPBW) of about 120°, which achieves a larger spatial coverage area than conventional omnidirectional antennas. The directivity of the antenna is only 1 dBi.