With the demanding system requirements for the fifth-generation (5G) wireless
communications and the severe spectrum shortage at conventional cellular frequencies …

A 3-D-printed Luneburg lens with a novel simplified geometry is presented. The rod-type
structures are employed as the unit cell of the gradient-index material to realize the required …

Two separate transmitarrays that operate at 77 GHz are designed and fabricated. The first
transmitarray acts as a quarter-wave plate that transforms a linearly polarized incident wave …

The enormous growth of wireless data traffic in recent years has made the millimeter-wave
(mm-wave) technology as a good fit for high-speed communication systems. Extensive …

We present a new technique for designing low-profile, ultrawideband, true-time-delay (TTD)
equivalent microwave lenses. Such a lens is composed of numerous spatial time-delay units …

This communication presents the design and experimental verification of a substrate
integrated waveguide fed lens antenna for 79 GHz automotive radar applications. The …

A novel array antenna with a flat-shoulder shaped radiation pattern is proposed as the
transmitting antenna for 77 GHz automotive radar application. When it is used in an …

A multi-beam antenna comprises an electromagnetic lens, at least one first antenna feed
element, at least one second antenna feed element, and a selective element located …

A multi-beam antenna comprises at least one curved surface, at least one dielectric
substrate, and a plurality of end-fire antenna feed elements on the dielectric substrate. The …

A three-dimensional (3D) printed Luneburg lens with nearly isotropic properties is
presented. The cubical-lattice-type and the rod-type gradient-index materials are employed …