A Cylindrical Lens Antenna With Extremely Flat Beams

Adhesive contact of cylindrical lens and a flat sheet

Methods are developed to estimate the adhesion and surface free energies of compliant materials from the contact deformations of cylindrical lenses with flat sheets. Some important differences are found between the cylindrical contact studied here and the widely studied geometry of spherical contact. For example, while the pull-off force is completely independent of the elastic constants (K) of...

Flat-Lens Focusing of Electron Beams in Graphene

Coupling electron beams carrying information into electronic units is fundamental in microelectronics. This requires precision manipulation of electron beams through a coupler with a good focusing ability. In graphene, the focusing of wide electron beams has been successfully demonstrated by a circular p-n junction. However, it is not favorable for information coupling since the focal length is...

The Cylindrical Antenna with Gap

Effect of the Imperfect Flat Earth on the Vertically Polarized Radiation of a Cylindrical Reflector Antenna

The radiation of a circular cylindrical reflector antenna in the presence of imperfect flat earth is treated in an accurate manner. The boundary value problem is formulated in terms of a full-wave integral equation converted to the dual-series equations and then regularized by using analytical inversion of the static part. The resulting Fredholm second-kind matrix equation is solved numerically...

Subwavelength imaging by a flat cylindrical lens using optimized negative refraction