Advanced monopole antenna with a wide beamwidth for the assessment of outdoor 5G wireless communication environments

Abstract

We propose an advanced monopole antenna to investigate non‐stationary outdoor wireless channel environments of 5G mobile communications. Our antenna has an omni‐directional beam pattern in the azimuth plane and a wide half‐power beamwidth (HPBW) in the elevation plane, respectively. To minimize blind angles along the axis of the monopole, we intentionally add a metallic annular ring around the monopole, which operates as a secondary source of our antenna. Then, the circumferential field from the secondary source appropriately interferes with the primary field from the monopole to widen the HPBW with a relatively high antenna gain in a far‐field region. An input signal is applied to a standard WR‐28 waveguide, and it is transferred to the monopole antenna through a coaxial waveguide. However, because impedance looking into the monopole and the waveguides are all different, we insert a mode converter between the rectangular and the coaxial waveguides. For better impedance matching, the coaxial waveguide is also used as an impedance transformer between the mode converter and the monopole antenna. Consequently, we can obtain the required omni‐directional radiation pattern with a wide HPBW and a high gain. All measurement data show good agreement with simulations, which proves the validity of our approach.

Dual Radial-Resonant Wide Beamwidth Circular Sector Microstrip Patch Antennas

“…These approaches can be basically divided into five distinct types in terms of their operation principles. As the most common way, the reflector-shaping method is presented in references [5]- [12]: Herein, the size and shape of a ground plane is employed to control the radiation characteristics of MPAs [9]. MPAs with different-shaped reflectors, such as square and tapered-elliptical cavity [5]- [8], cylindrical [9], [10] and tapered reflectors [11], can realize a much wider HPBW than their ordinary ones, at the cost of higher antenna height.…”

Spinel-olivine microwave dielectric ceramics with low sintering temperature and high quality factor for 5 GHz wi-fi antennas

“…With the increasing number of mobile devices, the demand for Wi-Fi networks is also increasing. Wi-Fi signals are available in two different frequency bands: 2.4 GHz (2400-2484 MHz) and 5 GHz (4915-5875 MHz), the primary difference between them is speed [34][35][36][37][38]. The higher frequency requires a faster transmission speed, which is in line with the development of the low permittivity of microwave dielectric ceramics.…”