Limitations and Solutions of Resonant-Type Metamaterial Transmission Lines for Filter Applications: the Hybrid Approach
Limitations and Solutions of Resonant-Type Metamaterial Transmission Lines for Filter Applications: the Hybrid Approach
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DOI：
10.1109/mwsym.2006.249871
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发表时间：
2006-06
期刊：
影响因子：
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通讯作者：
J. Bonache;M. Gil;I. Gil;J. García-García-J.-García-García-1404321779;F. Martín
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文献类型：
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作者：
J. Bonache;M. Gil;I. Gil;J. García-García-J.-García-García-1404321779;F. Martín
本文指出了用于滤波的谐振型左手传输线的主要局限性。自然地，带串联电容隙和互补分裂环谐振器（csrr）的微带线周期性加载表现出带通行为，波在允许的频带内反向传播。单元尺寸和下带边缘的选择性令人满意。但是，为了提高这些器件的竞争力和适用性，还需要提高上过渡带、带内损耗和带宽。这一贡献表明，通过在基本单元中引入接地的感应桩，可以克服先前的限制。实际上，最终的结构是基于csrr（即谐振型）的左手线和双传输线概念的结合。由于这个原因，这种方法被称为混合方法。强调了它在设计小尺寸高性能带通滤波器方面的优势和潜力，并提供了几个原型器件实例来说明可实现的性能
In this work, the main limitations of resonant-type left handed transmission lines for filter applications are pointed out. Naturally, microstrip lines periodic loaded with series capacitive gaps and complementary split rings resonators (CSRRs) exhibit a band pass behavior with backward wave propagation in the allowed band. Cell dimensions and selectivity at the lower band edge are satisfactory. However, the upper transition band, in-band losses and bandwidth should be improved for the competitiveness and applicability of these devices. It is shown in this contribution that by introducing grounded inductive stubs to the basic cell, the previous limitations can be overcome. Actually the resulting structure is a combination of the CSRR-based (i.e. resonant-type) left handed line and the dual transmission line concept. For this reason this approach has been termed as the hybrid approach. Its advantages and potentialities for the design of small size high performance band pass filter are highlighted, and several prototype device examples are provided to illustrate the achievable performance