The significant development of high frequency antennas over the past few decades has supported the tremendous growth of wireless communications and sensing connectivity. This figure provides a highlight of those wideband compact antennas designed for mobile communications, satellite communications, remote sensing, vehicular technology and wireless power transfer. The inverted-F antenna is popularly used in smart phones. The stacked-patch antenna, U-slotted patch antenna and L-probe fed patch antenna represent major bandwidth enhancement techniques for microstrip patch antennas. The dielectric resonator antenna is high in radiation efficiency at millimeter-wave and terahertz frequencies. The magneto-electric dipoles are versatile in applications due to their excellent characteristics of simple structure, wide bandwidth, high radiation efficiency, low cross polarization, low back radiation, symmetrical radiation patterns, and stable gain over the operating frequencies. Unlike conventional dipoles, horns or reflector antennas that are purely made of metallic materials, all these modern antennas can be fabricated at low cost either by the traditional photolithography process or conventional 3D-printing techniques. Other important designs can be found in the excellent papers of this Special Issue.
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