Quasi-optics-inspired low-profile endfire antenna element

Abstract

In this paper, the design, operational principle and experimental validation of an endfire antenna element that is inspired by the energy-focusing characteristics of graded-index optical fibre are presented. The antenna operates with a bandwidth of 1.5 GHz centred around 14 GHz. It has a gain of around 5.5 dBi along the band of interest and a good pattern stability over the band. The antenna derives its unique nature from the arrangement of the arc-shaped parasitics, that couple onto the antenna´s driver dipole. An electromagnetic refractive index retrieval mechanism is used to guide the placement of the parasitics to enhance the gain. In addition to the design principle, a parametric study of the main parameters and their influence on the antenna behaviour is presented. The antenna is a potential candidate for use in multiuser massive MIMO antenna arrays for 5G communications where space is premium and in antenna array applications where a low-profile antenna element with a high gain is a necessity.

Binary phase-controlled multi-beam-switching antenna array for reconfigurable 5G applications

“…This paper focuses on the proposal and validation of a simple beam-switching technique based only on two-phase states using a 4 × 4 antenna array. The proposal uses a new radiating element initially introduced in [3], although other appropriate radiating elements can be used for the purpose.…”