An ultra-wideband (UWB) array is presented for UHF-S band (0.19–2.3 GHz) communications with an emphasis on dual-linear polarisation and wide-angle scanning. The array achieves 12:1 impedance bandwidth for a voltage standing wave ratio (VSWR) <3 at broadside with low-angle scanning off broadside to 0°, 45°, 60° in the E -plane (VSWR < 3, 4, 3.1) and 0°, 45°, 60° (VSWR < 3, 3.8, 5.5) in the H -plane. A 7 × 11 prototype was fabricated and tested for verification. In addition, finite effects with respect to mounting UWB arrays in airborne platforms are discussed. Specifically, the effect of radomes, perfect electric conductor shielding walls and resistive walls on the gain of the designed tightly coupled dipole antenna was studied, showing that losses can approach 2 dB.

中文翻译：

---

机载应用双极化宽带紧耦合偶极子阵列

提出了一种用于UHF-S频带（0.19–2.3 GHz）通信的超宽带（UWB）阵列，重点是双线性极化和广角扫描。该阵列在宽边电压驻波比（VSWR）<3时可实现12：1的阻抗带宽，并且低角度扫描宽边时在0°，45°，60°范围内Ë 平面（VSWR <3、4、3.1）和0°，45°，60°（VSWR <3、3.8、5.5） H 飞机。制作了7×11的原型，并进行了测试以进行验证。此外，还讨论了在机载平台上安装UWB阵列的有限影响。具体而言，研究了天线罩，完善的电导体屏蔽壁和电阻壁对所设计的紧密耦合偶极天线增益的影响，结果表明损耗可能接近2 dB。