Modified cavity model to determine resonant frequency of tunable microstrip ring antenna

Gurel Ç. S. , Yazgan E.

ELECTROMAGNETICS, vol.19, no.5, pp.443-455, 1999 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 5
  • Publication Date: 1999
  • Doi Number: 10.1080/02726349908908662
  • Title of Journal : ELECTROMAGNETICS
  • Page Numbers: pp.443-455


In order to compute the resonant frequency of an air-gap tuned annular-ring microstrip antenna without the accuracy being affected from the air gap width, the cavity model is modified by using a new dynamic permittivity and inner/outer radii extension expressions. A close agreement is obtained between the theoretical and the experimental resonant frequency results for fundamental and higher order modes and for different gap widths.