Phase 2 Prototype Development of a GNSS Antenna Using a Meandered Spiral and High Impedance Surface

Arralis设计是一种低空间，重量和功率，可穿戴（例如在MK6头盔的MTP头盔盖中）或可安装的螺旋天线，它使用高阻抗表面（HIS）来减少厚度（至< 8毫米）。通过在HIS上使用弯曲的螺旋型天线，表面积保持在96 mm x 86 mm内，并且通过合并接地平面，安装或“接触”相互作用被移除，这意味着天线可以轻松地定位在设备或衣服上。第一阶段的工作表明，使用带状线Marchand Balun，单连接组件在GPS L5到GPS L1频段的50欧姆范围内匹配良好，并使用带内轴比< 3 dB的右圆极化（RHCP）波工作。通过使用多谐振HIS从天线反射器引入多个带内同相波，天线的增益和辐射效率比传统天线在更宽的带宽上增加，并且具有将厚度和重量保持在最小的优点。这种高度可重复的设计将使用现有的PCB制造工艺来制造，以确保在战场条件下具有弹性的技术的高产量，并将成本保持在最低水平。此外，柔性或编织材料将被实施，以使该设备适合于身体上的应用。在第一阶段进行的仿真结果表明，在较大的天线尺寸下，天线在所有频段都具有无源增益，性能良好。仿真还表明，该天线可以在较小的尺寸和外形下工作，使用有源增益，具有低直流功耗。

The Arralis design is a low space, weight and power, wearable (e.g. in a MTP helmet cover for an MK6 helmet) or mountable, spiral antenna which uses a High Impedance Surface (HIS) to reduce the thickness (to < 8 mm). By using a meandered spiral type antenna on a HIS, the surface area is kept within 96 mm x 86 mm, and by incorporating a ground plane, the mounting, or 'contact' interactions are removed, meaning that the antenna can be positioned easily on equipment or clothing. The work from Phase 1 shows that the single connection component is well matched to 50 ohms from GPS L5 to GPS L1 frequency bands using a stripline Marchand Balun, and operates using Right-Hand Circularly Polarised (RHCP) waves with an in-band axial ratio < 3 dB. By using a multi-resonant HIS to introduce multiple in-band, in-phase waves from the antenna reflector, the antenna gain and radiation efficiency are increased over a wider bandwidth than conventional antennas and with the added advantage that the thickness and weight are kept to a minimum. This highly repeatable design will be manufactured using existing PCB manufacturing processes to ensure high yields on a technology that is resilient for battlefield conditions, and to keep the costs to a minimum. Furthermore, flexible or woven materials will be implemented to render the device suitable for on-body applications. Simulation results performed in Phase 1 show good performance with the antenna having passive gain in all bands at the larger antenna size. Simulations also show that the antenna can operate, with low dc consumption using active gain, at a lower size and profile.