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基于Caloz等人提出的复合左右手传输线结构,结合低温陶瓷共烧技术(LTCC)工艺特点,通过三维交指电容和接地带状线结构实现了多层复合左右手传输线(ML CRLH TL)谐振器。该结构将平面的交指电容转移到Z方向上,有效地减小了谐振器的尺寸。通过对谐振器结构特性的研究和分析,总结出各参量变化对中心频率、带宽及带内波纹的影响。在此基础上设计出了平面尺寸仅为2.4mm×1.0mm的可用于WALN的高性能ML CRLHTL带通滤波器。
Based on the structure of compound left and right hand transmission line proposed by Caloz et al. And combined with the characteristics of low temperature ceramic co-fired technology (LTCC), ML CRLH TL resonator is realized by three-dimensional interdigitated capacitance and grounding stripline structure. The structure of the plane of the interdigital capacitance is transferred to the Z direction, effectively reducing the size of the resonator. Through the research and analysis of the structural characteristics of the resonator, the influence of the variation of parameters on the center frequency, bandwidth and in-band ripple is summarized. On this basis, a high performance ML CRLHTL band-pass filter designed for WALN with a planar size of only 2.4 mm × 1.0 mm was designed.