Microwave dielectric stepped-index flat lens antenna
Published online by Cambridge University Press: 19 October 2016
Abstract
Dielectric stepped-index flat lens antennas for operation at 12 GHz are presented. A brick-shaped dielectric with a permittivity profile optimized for focusing is sandwiched between the metallic plates of an open-ended parallel-plate waveguide. A tapered slot antenna is placed at the focal point of the dielectric lens, thereby creating antennas with high directivity of 16.8 and 15.8 dBi, respectively. In the two versions of the antenna, the parallel-plate waveguide operates in TEM-mode and in the first higher-order TE-mode, respectively. The dielectric profile is realized by appropriate mixtures of alumina ceramic powder and microscopic hollow glass spheres, realizing permittivity ranging from εrel = 1.31 to εrel = 3.24. The design of the complete antennas is based on geometrical optics followed by optimizations with a full-wave electromagnetic solver. Measurements show good agreement with simulations.
- Type
- Research Papers
- Information
- International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 5 , June 2017 , pp. 1103 - 1109
- Copyright
- Copyright © Cambridge University Press and the European Microwave Association 2016
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