A simple approach for accurate
determination of the resonant frequencies of
microstrip antennas of regular geometries is
developed and presented. In this approach, a
generalised empirical formula for the
computation of effective dielectric permittivity is
given which takes into account the ratio of the
fringing area to the area of the patch. A
correction to the equivalent side length of an
equilateral triangular patch, previously published,
is modified and a new formula is given. A
correction to the effective dimensions of an
elliptical microstrip antenna is also carried out.
Numerical results obtained for the resonant
frequencies of elliptical, circular, rectangular and
equilateral-triangular microstrip antennas are in
good agreement with the available theoretical and
experimental results reported by others. The
present approach is more efficient, simpler and
more accurate
Description:
IEE Proc.-Microw. Antennas Propag., Vol. 145, No. 2, April 1998