Title :
The mode features of an annular sector microstrip antenna
Author :
Sultan, Mohammed A. ; Tripathi, Vijai K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Oregon State Univ., Corvallis, OR, USA
fDate :
2/1/1990 12:00:00 AM
Abstract :
A rigorous analysis of the features of the modes of an annular sector printed microstrip antenna is presented. General expressions for its radiation field are derived by using the cavity model. The expressions are used to study the radiation patterns, radiation peak in the broadside direction, and beamwidth of different structures for various sector angles, widths, and modes of excitation. This includes the special cases of quarter-, half-, three-quarters-, and ideal-gap open-ring structures. Compared to a closed ring, the results indicate that the TM12 mode is superior to the TM11 mode with regard to the radiation properties in the annular sector as its angle approaches 2π
Keywords :
antenna radiation patterns; microstrip antennas; TM mode; annular sector microstrip antenna; broadside direction; cavity model; closed ring; different structures beamwidth; excitation modes; half ring; ideal-gap open-ring structures; quartering; radiation field; radiation patterns; radiation peak; sector angles; three quarters ring; widths; Antenna radiation patterns; Boundary conditions; Dielectric substrates; Equations; Genetic expression; Magnetic separation; Microstrip antennas; Permittivity; Receiving antennas; Resonant frequency;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
