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利用槽隙加载及短接技术设计了双频小型微带天线。通过调节短接面宽度,两谐振频率f10及f30可明显降低,天线尺寸显著减小,而且频比(f30/f10)的可调范围为1.7～2.3。首次将三维H MRTD(Haar Wavelet BasedMultiresolutionTimeDomain)全波分析方法应用于该天线的建模和分析,并将H MRTD数值计算公式推广到了非均匀有耗媒质中。数值模拟结果同传统FDTD(FiniteDifferenceTimeDomain)方法及实验结果进行了比较。结果表明,每个波长只需取较少的空间离散网格,三维H MRTD时域全波分析方法便能较精确地模拟微机械微带天线,并能有效地减少CPU计算时间及节省计算机内存。
The dual-band miniature microstrip antenna is designed by slot loading and short-circuiting technology. By adjusting the width of the shorting face, the two resonant frequencies f10 and f30 can be significantly reduced, the antenna size is significantly reduced, and the adjustable range of the frequency ratio (f30 / f10) is 1.7 to 2.3. For the first time, a full-wave analysis method of three-dimensional H MRTD (Haar Wavelet Based Multi-solution Time Domain) is applied to the modeling and analysis of the antenna, and the H-MRTD numerical calculation formula is extended to the non-uniform lossy medium. The numerical simulation results are compared with the traditional FDTD (FiniteDifferenceTimeDomain) method and experimental results. The results show that only a few spatial discrete grids are needed for each wavelength, and the three-dimensional H MRTD time-domain full-wave analysis method can simulate the micromechanical microstrip antenna more accurately, and can effectively reduce the CPU computation time and save the computer memory .