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

ARRALIS的设计是一种低空间、重量和功率、可穿戴的(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&lt；8 mm)。通过在HIS上使用蜿蜒的螺旋型天线，将表面积保持在96 mm x 86 mm以内，并通过加入接地面，消除了安装或“接触”交互，这意味着天线可以轻松地放置在设备或衣服上。第一阶段的工作表明，使用带状线Marchand Balun，从GPS L5到GPS L1频段，单连接分量可以很好地匹配到50欧姆，并且使用带内轴比为3分贝的右侧圆极化(RHCP)波进行操作。通过使用多谐振HIS从天线反射器引入多个带内同相波，天线增益和辐射效率在比传统天线更宽的带宽上增加，并且附加的优点是将厚度和重量保持在最小。这种高度可重复的设计将使用现有的印刷电路板制造工艺来制造，以确保对战场条件具有弹性的技术的高成品率，并将成本保持在最低水平。此外，还将采用柔性或编织材料，使该设备适合于车身应用。在第一阶段进行的仿真结果表明，当天线尺寸较大时，天线在所有频段都具有较好的无源增益。仿真还表明，该天线可以在较小的尺寸和轮廓下以较低的DC消耗和使用有源增益来工作。

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.