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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Parameter Extraction of Interdigital Slow-Wave Coplanar Waveguide Circuits Using Finite Difference Frequency Domain Algorithm
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Parameter Extraction of Interdigital Slow-Wave Coplanar Waveguide Circuits Using Finite Difference Frequency Domain Algorithm

机译：有限差分频域算法提取叉指式慢波共面波导电路的参数

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摘要

The slow wave effect can be obtained by a capacitively loaded structure with a symmetrical interdigital line connected on both sides of the coplanar waveguide (CPW) central line. The ferroelectric thin film with high dielectric constant can reduce the size of circuit and make it possible to realize tunable devices such as filter by applying voltage on it. Actually, this kind of slow wave structure is a periodic guided-wave structure and can be analyzed by using classic finite difference frequency domain (FDFD) method for periodic guided-wave structures. However, the very compact slow-wave structures will usually result in simulation errors when the classic FDFD method is adopted, which will lead to a nonsym-metrical generalized eigenvalue problem. In this article, the shift-and-invert (SI) Arnoldi method is used to directly resolve this nonsymmetrical generalized eigenvalue problem. As a result, the accuracy of FDFD algorithm is improved. Especially for the large scale eigenvalue problem, SI method can also have a very fast speed of calculation. By means of its complex propagation constant obtained from simulation, one can extract circuit parameters of the interdigital capacitor. Consequently, one can analyze and design relevant resonators and filters in a quick and accurate manner, which are constructed with such interdigital slow wave Structures.
机译：慢波效应可以通过在共面波导（CPW）中心线的两侧连接对称的叉指线的电容负载结构获得。具有高介电常数的铁电薄膜可以减小电路尺寸，并且可以通过在其上施加电压来实现诸如滤波器之类的可调谐器件。实际上，这种慢波结构是周期性的导波结构，可以使用经典的有限差分频域（FDFD）方法对周期性的导波结构进行分析。但是，采用经典的FDFD方法时，非常紧凑的慢波结构通常会导致仿真错误，这将导致非对称广义特征值问题。在本文中，移位和反转（SI）Arnoldi方法用于直接解决此非对称广义特征值问题。结果，提高了FDFD算法的准确性。特别是对于大规模特征值问题，SI方法也可以具有非常快的计算速度。借助于从仿真中获得的复数传播常数，可以提取叉指电容器的电路参数。因此，人们可以快速而准确地分析和设计相关的谐振器和滤波器，它们是用这种叉指式慢波结构构成的。

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