基于LTCC工艺双频GPS陶瓷微带天线研究

Research of Dual-Band GPS Ceramic Microstrip Antenna Based on LTCC Technics

在空腔模型理论基础上,利用微扰法对切角矩形微带天线进行严密的数学推论。并设计了GPS双馈点双频圆极化陶瓷微带天线。根据设计公式计算出结构参数,在Ansoft-HFSS软件中建立天线模型,通过参数优化得到天线参数,并利用LTCC工艺进行样品制作。结果表明:样品天线工作在1 575 MHz和1 227 MHz时,10 dB带宽均大于10 MHz,回波损耗均小于-15 dB,轴比均小于4 dB,仿真结果与测试结果相似。总结了天线小批量生产的经验,提出了进一步小型化的研究方向。

Based on the cavity mode theory,the GPS ceramic microstrip antenna with the corner-truncated rectangle has been analyzed mathematically by using the perturbation method.A dual-band GPS circularly polarized ceramic microstrip antenna with double feed-in points has been designed.The structure parameters have been caculated by the design formula.The antenna＇s model has been established and simulated by Ansoft-HFSS.The optimal antenna＇s parameters have been obtained and an antenna sample has been fabricated by using LTCC technics.The experimental results showed that the 10 dB bandwidth was above 10 MHz,the return loss was below-15 dB and the axial ratio was below 4 dB when the antenna operated at 1 575 MHz and 1 227 MHz.The measured results confirm the validity of this design,which satisfied the requirements of GPS applications at 1 227 MHz and 1 575 MHz.Finally,the analysis of the antenna mass productions has been carried out and the further miniaturized trends of this antenna have also been proposed in this paper.