Accession Number : ADA300530

Title :   The Effect of an Air Gap on the Coupling Between Two Planar Microstrip Lines.

Descriptive Note : Technical rept.,

Corporate Author : MISSISSIPPI UNIV UNIVERSITY DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Elsherbeni, Atef Z. ; Rodriguez-Pereyra, Vicente ; Smith, Charles E.

PDF Url : ADA300530

Report Date : 29 SEP 1995

Pagination or Media Count : 63

Abstract : The finite difference (FD) technique is used to investigate the air gap effect on the coupling between two planar microstrip lines. The strip lines are embedded between a dielectric substrate and a dielectric overlay. The air gap between the substrate and the overlay is present due to the thickness of the strips and/or the roughness of the planar surfaces. A quasi-static FD technique based on the solution of Laplace's equation is used to solve for the potential distribution in the region around the strips. The FD mesh is truncated by an artificial boundary to allow for a numerical solution with the available computer resources. At this artificial boundary an approximate boundary condition is used to truncate the FD mesh. From the potential distribution, the charge and the capacitance and inductance matrices of the stripline system are evaluated. The coupling or crosstalk between the lines are then defined and computed. The effects of the conducting strips thickness and the properties of the materials between the strips on the coupling are illustrated through numerical examples.

Descriptors :   *STRIP TRANSMISSION LINES, *ANTENNA RADIATION PATTERNS, *MICROWAVE TRANSMISSION, COUPLING(INTERACTION), THICKNESS, NUMERICAL ANALYSIS, DIELECTRICS, SUBSTRATES, BOUNDARIES, PLANAR STRUCTURES, ROUGHNESS, CROSSTALK, CAPACITANCE, OVERLAYS, LAPLACE TRANSFORMATION, AIR GAPS.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE