An L-strip fed stacked patch antenna for maritime satellite communications

A practical antenna has been designed and developed for INMARSAT mobile satellite communications. The design uses low cost materials such as foam and copper foil to create a stacked microstrip antenna array. Several techniques were adopted to enhance the impedance bandwidth and axial ratio bandwidth. The final design parameters were optimized by EM simulation. Finally, the L-strip fed six-element stacked microstrip antenna array was constructed and tested. Simulated and measured results show that in the whole INMARSAT work band, the VSWR of the antenna is less than 1.6, its antenna gain is higher than 15dB and wide-angle axial ratio （AR） 3dB is more than 21°. The antenna has been successfully used with a HNS 9201 terminal.     

船载海事卫星通信印刷四臂螺旋天线设计

为了解决四臂螺旋天线馈电结构复杂和网络损耗较大的问题,提出一种集成新型馈电网络结构的印刷四臂螺旋天线。通过大量的计算机电磁仿真分析发现天线的性能主要由螺旋臂的长度、螺旋的直径和螺旋节距的升角决定。基于此,制作了一款应用于船载海事卫星通信的印刷四臂螺旋天线并进行了测试。测试结果表明天线在系统要求的工作频带内驻波比小于1．4,增益高于2dB,半功率波瓣宽度达到140°,上半空间主要区域轴比小于3dB。测试结果与仿真结果具有较好的一致性。天线实际应用效果良好。