Characterization of Surface-Wave and Leaky-Wave Propagation on Wire-Medium Slabs and Mushroom Structures Based on Local and Nonlocal Homogenization Models

被引：67

作者：

Yakovlev, Alexander B. ^{[1
]}

Silveirinha, Mario G. ^{[2
]}

Luukkonen, Olli ^{[3
]}

Simovski, Constantin R. ^{[3
]}

Nefedov, Igor S. ^{[3
]}

Tretyakov, Sergei A. ^{[3
]}

机构：

[1] Univ Mississippi, Dept Elect Engn, University, MS 38677 USA

[2] Univ Coimbra, Dept Engn Electrotecn, Inst Telecomunicacoes, P-3030 Coimbra, Portugal

[3] Aalto Univ, Dept Radio Sci & Engn, SMARAD Ctr Excellence, FI-02015 Helsinki, Finland

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2009年 / 57卷 / 11期

基金：

芬兰科学院;

关键词：

Analytical modeling; electromagnetic-bandgap (EBG) structures; high-impedance surfaces (HIS); homogenization; leaky waves; mushroom structures; spatial dispersion (SD); surface waves; wire medium (WM); ARTIFICIAL MAGNETIC CONDUCTORS; HIGH-IMPEDANCE SURFACES; GUIDE;

D O I：

10.1109/TMTT.2009.2031933

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, a nonlocal homogenization model is proposed for the analysis of the spectrum of natural modes on sub-wavelength mushroom-type high-impedance surfaces composed of a capacitive grid connected to a grounded wire-medium (WM) slab. Modal characteristics of mushroom structures are studied in conjunction with the surface-wave and leaky-wave propagation on WM slabs based on local and nonlocal homogenization models, showing the importance of spatial dispersion (SD) in WM. It is shown that mushroom structures support proper real ( bound) forward and backward modes, whose dispersion determines the stopband properties of the mushroom structure, and proper (exponentially decaying from the surface) and improper ( exponentially growing from the surface) complex leaky-wave modes related to the backward and forward radiation, respectively. Results obtained by different homogenization models are compared leading to important conclusions. Specifically, an interesting observation concerns the mushroom structures with short vias, wherein the SD of the WM slab is significantly reduced, and the results of local and nonlocal homogenization models are in excellent agreement.

引用

页码：2700 / 2714

页数：15

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