A simple and accurate analysis of an annular-slot antenna backed by an inhomogeneously filled cavity is described. The analysis is based on a magnetic-field integral equation, which is solved approximately using a variational formulation. The results obtained from the analysis are compared with experimental measurements on a 5 GHz annular-slot antenna fabricated on a Duroid 5880 substrate. It is found that only three terms of a series expansion are needed for an accurate solution. Measured results for input impedance and far-field radiation patterns for an annular slot backed by different-sized cavities are presented.
|Number of pages||4|
|Journal||IEE Proceedings: Microwaves, Antennas and Propagation|
|Publication status||Published - 1997|
- Annular-slot antennas
- Cavity-backed ring-slot antennas