In this note we begin the development of two types of Impulse Radiating Antenna (IRA). o These two designs include a 23 cm diameter reflector IR4, with an F/D of0.38, and a solid dielectric-lens IIU4, or dielectric-immersed lens IIU. This latter design is a Transverse Electromagnetic (TEM) horn immersed in a dielectric, with a prolate spheroidal lens interface to air. The reflector IR4 consists...

seminar audiences at London Business School and the Rotman School, Nick Argyres and three anonymous reviewers for their comments and suggestions on various drafts of this paper. I am particularly grateful to all of the employees of the Bank who spent so much time talking with me and sharing the data that led to this paper.

In order to expand the applications of traditional Vivaldi antenna by addressing low gain antenna, this paper combines phase distribution aperture based on analysis transmission characteristics a dielectric unit utilizing advantages artificial electromagnetic material. A more reasonable method loading lens is proposed and utilized in combination with edge grooving. comparison results shows that...

In this letter, we present an additively manufactured half-Gutman lens antenna operating at 30 GHz. The hemispherical allows for a compact beamformer while maintaining the wide scanning capabilities of Gutman lenses. This solution further enables to better integrate feed system when compared more conventional half-Luneburg design as focal arc is moved inside lens. graded-index implemented with ...

We investigate dispersion properties of a hexagonal dielectric periodic structure that can be used to engineer graded-index lenses. The connection between the geometry and its symmetries is explained. Furthermore, we demonstrate with increased symmetry more isotropic than conventional counterpart. To validate our analysis, designed, manufactured, measured planar Luneburg lens antenna. antenna h...