Analysis of multi-conductor coupled microstrip lines with an aperture in the ground plane for the design of a broadband filter

D. Packiaraj, K.J. Vinoy, M. Ramesh and A.T. Kalghatgi

Journal of Electromagnetic Waves and Applications, 2013, vol. 27, issue 7, 856-867

Abstract: Closed-form expressions for the propagation characteristics of coupled microstrip lines with a symmetrical aperture in the ground plane are derived. Expressions for the regular microstrip coupled lines have been modified using physical insights to incorporate the effect of the aperture. The accuracy of these expressions has been verified by full-wave simulations and compared with conformal mapping analysis. These expressions are accurate within 5% for a substrate whose thickness varies from 0.2 to 1.6 mm and permittivity in the range of 2–10. Designing a broadband filter based on planar multi-conductor coupled lines with aperture in the ground plane is demonstrated in this paper using the proposed expressions for its practical use.

Date: 2013
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DOI: 10.1080/09205071.2013.789410

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