双频微型贴片天线的H-MRTD模拟

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-Based Multiresolution Time Domain)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(Finite Difference Time Domain)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.

H-MRTD simulation of dual-frequency miniature patch antenna

A novel MEMS dual-band patch antenna is designed using slot-loaded and short-circuitedsize-reduction techniques. By controlling the short-plane width, f10 and f30, two resonant frequen-cies, can be significantly reduced and the frequency radio (f30/f10) is tunable in the range 1.7～2.3.The Haar-Wavelet-Based multiresolution time domain (H-MRTD) is used for modeling and analyzingthe antenna for the first time. In addition, the mathematical formulae are extended to an inhomoge-nous media. Numerical simulation results are compared to those achieved using the conventional 3-Dfinite-difference time-domain (FDTD) method and measured. It has been demonstrated that, with thistechnique, space discretization with only a few cells per wavelength gives accurate results, leading to areduction of both memory requirements and computation time.