Analysis of Microstrip Line with Bends Using Fourier Transform and Mode-Matching Technique

Hyun Ho PARK  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B    No.7    pp.1731-1738
Publication Date: 2010/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1731
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced Electromagnetic Compatibility Technology in Conjunction with Main Topics of EMC'09/Kyoto)
Category: PCB and Circuit Design for EMI Control
Keyword: 
microstrip bend,  electromagnetic scattering,  signal integrity,  Fourier transform,  mode-matching technique,  

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Summary: 
In this paper, the transmission and reflection properties of the microstrip line with bends are investigated using the Fourier transform and a mode-matching technique. Based on the waveguide model, the microstrip bends are modeled as the rectangular waveguides with perfect electric conducting top and bottom walls and perfect magnetic conducting side walls. Analytical closed-form expressions for transmission and reflection coefficients are developed using the residue calculus. To verify the proposed method, numerical computations are performed for comparison with 3D full-wave simulations and measurements. A quarter-wavelength transmission line scheme is also proposed to improve the signal integrity of double bend discontinuity.