This paper provides a review spanning different technologies used to implement near‐field
focused antennas at the microwave frequency band up to a few tens of GHz: arrays of …

Multibeam antennas have emerged as a promising concept for applications where selective
beam coverage is required. Multibeam radiation can be achieved leveraging the concept of …

This work presents a review of the generalized intersection approach (GIA) for
electromagnetic array antenna beam-sha** synthesis. After briefly describing the …

Electromagnetic metasurfaces are structured surfaces consisting of a thin array of
subwavelength elements with engineered scattering properties, thus providing a promising …

Several RF and microwave radiating devices, such as horn antennas, Fabry–Perot cavity
antennas, and aperture-fed focusing devices, are excited through rectangular waveguides …

Bessel beams (BBs) can be generated at microwave frequencies by means of compact,
planar devices based on Fabry–Perot cavity leaky-wave resonators. Most designs are based …

A novel variable-focus near-field-focused (NFF) antenna implemented by mechanically
reconfigurable folded reflectarray is proposed in this communication. The working principle …

We present numerical simulations of the near-field focusing capabilities of a dynamically
reconfigurable holographic metasurface aperture. The aperture consists of a parallel-plate …

A radially periodic 2-D leaky-wave (LW) antenna is studied for the generation of zeroth-order
Bessel beams within a limited spatial region and over a wide-frequency range. The antenna …

The quadratic phase distribution on the antenna aperture is necessary to produce a near-
field-focused (NFF) beam. The generation, as well as the steering of the quadratic phase …