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An efficient method for analyzing nonuniformly coupled microstrip lines

✍ Scribed by Dengpeng Chen; Zhongxiang Shen; Erping Li

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
250 KB
Volume
15
Category
Article
ISSN
1096-4290

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✦ Synopsis

This article presents an efficient method for analyzing nonuniformly coupled microstrip lines. By choosing a modal-transformation matrix, the coupled nonlinear differential equations describing the symmetric nonuniformly coupled microstrip lines are decoupled using even-and odd-mode parameters; the original problem is thus transformed into two single nonuniform transmission lines. A power-law function of arbitrary order and having two adjustable parameters is chosen to better approximate the equation coefficients. Closedform ABCD matrix solutions are obtained and used to calculate the S-parameters of nonuniformly coupled microstrip lines. Numerical results for two examples are compared with those from a full-wave commercial package and experimental ones in the literature in order to demonstrate the accuracy and efficiency of this method. This highly efficient method is employed to optimize a cosine-shape 10-dB codirectional coupler, which has good return loss and high directivity performance over a wide frequency range.

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