双频一体化超宽带探地雷达天线设计

Design of Dual-Frequency Integrated Ultra-Wideband Ground Penetrating Radar Antenna

针对目前探地雷达(Ground Penetrating Radar,GPR)产品单一频段工作所导致的耗时费力、效率低等缺点,文中设计实现了一种中心频率分别为400 MHz、1000 MHz且带宽为200~1500 MHz的双频一体化复合阵列天线,并将其应用于超宽带(Ultra-Wide Band,UWB)探地雷达系统中。阵列天线包含3个中心频率为400 MHz和6个中心频率为1000 MHz的蝶形天线,具备双频段同时探测能力,可实现一条测线含两种不同频段的探测结果,克服了传统探地雷达不同频率的重复探测问题,增强了探地雷达系统的实用性。所提出的双频一体化探地雷达天线具有超宽带、高增益、波束窄等特点,其相对带宽为153%,整个带宽内最高实现17.6 dBi峰值增益,半功率波束宽度最窄为7.6°,为高分辨率、高效率探地雷达应用提供了一种新的天线方案。

In view of the disadvantages of time consuming and low efficiency caused by single frequency band of Ground Penetrating Radar(GPR)products,a dual-frequency integrated composite array antenna with center frequency of 400 MHz and 1000 MHz and bandwidth of 200~1500 MHz is designed and implemented,and is applied in Ultra-Wide Band(UWB)GPR system.The array antenna consists of three butterfly antennas with a center frequency of 400 MHz and six butterfly antennas with a center frequency of 1000 MHz,and has the capability of simultaneous detection of dual frequency bands,which can realize the detection results of two different frequency bands in one survey line,overcome the problem of repeated detection of different frequencies of traditional GPR and enhance the practicability of GPR system.The proposed dual-frequency integrated GPR antenna has the characteristics of ultra-wideband,high gain and narrow beam.Its relative bandwidth is 153%,the maximum peak gain of 17.6 dBi is achieved in the whole bandwidth,and the narrowest half-power beam width is 7.6°.It provides a new antenna scheme for high resolution and high efficiency GPR applications.