The high Q-factor (low bandwidth) and low efficiency make the design of small antennas
challenging. Here, convex optimization is used to determine current distributions that …

It is demonstrated numerically that a metamaterial-inspired, low profile (height approximately
λ/80), electrically small (ka= 0.45) Huygens source antenna can be designed to radiate at …

This article investigates the superdirectivity limits of end-fire linear arrays based on closely
spaced radiating elements. First, directivity upper bounds have been derived analytically in …

In this paper, a super directive four-element compact parasitic antenna array has been
designed and optimized using an ad hoc procedure based on the Harrington maximum …

Highly directive antenna systems that will address the needs of space-limited Internet-of-
Things (IoT) devices and their NextG applications are in demand. Compact high-frequency …

Antenna current optimization is a tool that offers many possibilities in antenna technology.
Optimal currents are determined in the antenna design region and used for physical …

For nearly a century, the concept of needle radiation has captured the attention of the
electromagnetics communities in both physics and engineering, with various types of …

Multipole expansions are an essential analysis tool in the foundations of the descriptions of
the electromagnetic fields radiated by electric and magnetic sources. Nevertheless, practical …

We present an analysis of a slotted waveguide antenna (SWA) whose directivity has been
enhanced by using metamaterial parasitic elements. We apply an adapted form of the …

Superdirective arrays have become the key technique in enhancing the directivity of
electrically small antennas. By forming an array of closely spaced unit elements, a high …