CAJ | 학술논문

　　为满足高速铁路无损探测需兼顾低频探测深度与高频探测精度的要求，采用理论计算与软件仿真结合的方法，设计制作了一种双频带（300 MHz/1 GHz）指数型TEM喇叭天线并对其进行了测量。所设计的指数型TEM喇叭天线采用末端加载和适当天线臂切削来实现此超宽带天线的双频带工作。仿真与实测结果表明，天线分别工作在中心为360 MHz、带宽约为110 MHz的低频带和中心为1020 MHz、带宽约为260 MHz的高频带，相对带宽均大于20％。实测天线的接收信号保真度较高，拖尾持续时间短，满足设计要求。此外，这种双频带天线系统可减少雷达系统天线和采样盒等设备的使用数量，降低雷达系统的成本，有较好工程应用前景。
　　위만족고속철로무손탐측수겸고저빈탐측심도여고빈탐측정도적요구，채용이론계산여연건방진결합적방법，설계제작료일충쌍빈대（300 MHz/1 GHz）지수형TEM나팔천선병대기진행료측량。소설계적지수형TEM나팔천선채용말단가재화괄당천선비절삭래실현차초관대천선적쌍빈대공작。방진여실측결과표명，천선분별공작재중심위360 MHz、대관약위110 MHz적저빈대화중심위1020 MHz、대관약위260 MHz적고빈대，상대대관균대우20％。실측천선적접수신호보진도교고，타미지속시간단，만족설계요구。차외，저충쌍빈대천선계통가감소뢰체계통천선화채양합등설비적사용수량，강저뢰체계통적성본，유교호공정응용전경。
To meet the demand of nondestructive exploration for high-speed railway,which requires outstanding depth in low frequency and resolution in high frequency,a dual-band (300 MHz and 1 GHz)exponential Trans-verse Electric and Magnetic (TEM)horn antenna is designed based on theoretical calculation and numerical simu-lation in this paper . End-loading and arm profiling are utilized in the proposed antenna design for conducting the dual-band performance . Simulation and experiment results show that the antenna works both in 360 MHz and1 020 MHz with bandwidths of 110 MHz and 260 MHz respectively,which exceeds the ultra-wide band(UWB)re-quirement of 20% relative bandwidth . The proposed antenna also has the advantages in signal fidelity and lowringing,which fully meets the design requirements . Furthermore,the proposed dual-band UWB antenna system has more potential advantages in engineering application field because of the low cost of the entire radar system.