Analysis of conformal conical log-spiral antennas on dielectric cavities

Radiation properties of conformal conical log-spiral antennas (CLSA) on dielectric cavities are investigated by using the hybrid finite element and boundary integral equation method (FE-BI) in the paper. Firstly the radiation patterns of ordinary conformal CLSA on solid dielectric cones are introduced. Then the radiation properties of conformal CLSA on dielectric cavity with metal inner wall are discussed in detail. The influence of different media and different frequencies on antenna patterns is studied. Comparison with the results of solid dielectric cones and CLSA in the air is also made. The final numerical results show that radiation properties of conformal CLSA on dielectric cavities are greatly changed by these parameters. All parameters should be carefully considered in practical applications.