Effects of Fringing Fields on the Capacitance of Circular Microstrip Disk

Weng Cho Chew, Jin Au Kong

Research output: Contribution to journalArticlepeer-review


The effects of fringing fields on the capacitance of a circular microstrip disk are studied with the dual integral equation formalism for practical microstrip circuits when the substrate thickness is small. Approximstions as well as exact numerical evaluations are made in the calculation of the capacitance. With a seminumerical approach, an approximate formula for the capacitance is obtained and shown to yield accurate results with the simple use of a calculator. Asymptotic lower bound and exact numerical computations are also carried out. The various techniques are illustrated and compared with numerical results.

Original languageEnglish (US)
Pages (from-to)98-104
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
StatePublished - Feb 1980
Externally publishedYes

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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