一种应用于微波探测的双频天线的设计

为增加火灾探测天线频带范围,基于微带贴片天线,采用凹槽加载技术,设计了中心频率在Ku(12.4～18.0 GHz)波段的双频微带单元天线.利用HFSS软件对其建模、仿真及优化,结果表明,该单元天线在14.8 GHz和16.1 GHz时回波损失达到最小值,且回波损失小于-10 dB的带宽分别为600MHz和390 MHz.利用该单元天线,进而设计了一款2×2阵列天线,实测结果表明:该阵列天线具有很好的双频谐振特性,在14.3～14.9 GHz和15.7 ～16.1 GHz频带内既保留了原单元天线好的回波损耗特性,又提高了增益,使两个频段最大增益分别达到13.7 dBi和11.3 dBi.

Design of a Dual Band Antenna for Microwave Detection

In order to increase the antenna detection frequency range of fire detection,a dual-frequency microstrip antenna with a center frequency of Ku (12.4 ～ 18.0 GHz) band is designed by slotting on the basis of microstrip patch antenna.By using HFSS software for its modeling,simulation and optimization,results show that the return loss of the antenna reaches the minimum at 14.8 GHz and 16.1 GHz,and the bandwith with the return loss less than-10 dB is 600 MHz and 390 MHz respectively.A rectangular microstrip array antenna of 2-by-2 is designed on this basis,echo loss is less than-10 dB in 14.3 ～ 14.9 GHz and 15.7 ～ 16.1 GHz bands,and the maximum gains are 13.7 dBi and 11.3 dBi,respectively.The antenna has good characteristics of dual frequency resonance and high gain.