New accurate formula for the characteristic impedance of a microstrip line with a dielectric overlay
New accurate formula for the characteristic impedance of a microstrip line with a dielectric overlay
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具有电介质覆盖层的微带线特性阻抗的新精确公式
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
L. Vegni
中科院分区：
文献类型：
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作者：
F. Bilotti;A. Alú;L. Vegni
目的——本文的目的是提出存在介电盖的情况下微带线特性阻抗的解析表达式。设计/方法/途径 – 假设准 TEM 传播模式，采用基于 Schwarz-Christoffel 变换的严格共形映射来推导等效电容模型，然后应用该模型推导有效介电常数和线路特性阻抗的闭合解析表达式。研究结果——这样的公式不限于单个覆盖层的情况，还可以考虑任意数量的电覆盖层。还与已发表的数值结果和单覆盖层情况下的全波模拟进行了比较，以测试所提出方法的有效性。独创性/价值——具有单个介质覆盖层的微带线特性阻抗的新分析公式与之前的方法相比显示出更好的性能...
Purpose – The purpose of this paper is to present an analytical expression for the characteristic impedance of a microstrip line in presence of a dielectric cover. Design/methodology/approach – Assuming a quasi-TEM propagation mode, a rigorous conformal mapping based on the Schwarz-Christoffel transformation is employed to derive the equivalent capacitance model, which can then be applied to derive a closed analytical expression for the effective permittivity and the characteristic impedance of the line. Findings – Such a formulation is not limited to the case of a single cover layer, but an arbitrary number of electric overlays can be considered as well. Comparisons with published numerical results and full-wave simulations in the case of a single cover layer have been also performed to test the validity of the proposed approach. Originality/value – The new analytical formula for the characteristic impedance of a microstrip line with a single dielectric cover shows better performances compared to the one...