Gap Discontinuity in Microstrip Lines: An Accurate Semianalytical Formulation

A semianalytical full-wave formulation is used to analyze a narrow gap in a microstrip line. The analysis assumes that the length of the gap is small compared to the strip width, but allows for an arbitrarily high frequency. The formulation accounts for radiation from the gap into space and into sur...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2011-06, Vol.59 (6), p.1441-1453
Main Authors: Rodriguez-Berral, Raúl, Mesa, F, Jackson, D R
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Current density
Discontinuities
Discontinuity
Electric, optical and optoelectronic circuits
electromagnetic radiation effects
Electronics
Equivalent circuits
Exact sciences and technology
Formulations
High frequencies
Impedance
Microstrip
microstrip circuits
microstrip discontinuities
Microstrip lines
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Scattering
Scattering parameters
Substrates
Surface waves
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Summary:A semianalytical full-wave formulation is used to analyze a narrow gap in a microstrip line. The analysis assumes that the length of the gap is small compared to the strip width, but allows for an arbitrarily high frequency. The formulation accounts for radiation from the gap into space and into surface waves. Based on this formulation, the scattering parameters of the gap are obtained along with the complete equivalent circuit of the gap. The percentage of power lost due to gap radiation from an incident mode on the microstrip line is found, and the physics of the gap radiation are examined.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2011.2123108