【摘要】 设计了一个工作在UHF频段的宽带单极子天线.先将单极子天线截为两段并串联起来,以改善天线频率高端的水平方向增益,然后利用无耗LC梯形宽带匹配网络在100～400MHz对天线进行匹配.用CST2009仿真软件得到优化的天线截断位置和匹配网络元件值等参数.对加载匹配网络前后的截断天线反射系数进行了测试,结果与仿真结果吻合较好.研究表明,加载匹配网络后的天线系统水平增益在100～350MHz频段大于0dBi,在350～400MHz频段介于-7～0dBi之间.反射系数S₁₁在100～400MHz频段均小于10dB,匹配网络效率超过60%.更多还原

【Abstract】 A broadband monopole antenna working in UHF band is designed.A monopole antenna is cut into two parts.They are connected in series.This step improves the horizontal gain in the upper part of the operating band.A lossless LC ladder is then used to match the antenna impedance from 100 MHz to 400 MHz. The truncating position and circuit element parameters in the matching network are obtained using CST2009 optimization.Reflection coefficients of the truncated antennas both with and without the matching network are measured,showing good agreement with the simulation results.The following conclusions are drawn.The gain in the horizontal direction of the antenna with matching network is more than 0 dBi between 100 MHz and 350 MHz,and stays within -7～0 dBi from 350 MHz to 400 MHz.The simulated reflection coefficient S₁₁ of the antenna is below 10 dB within 100 MHz and 400 MHz.The efficiency is over 60%within the operating band.更多还原