Low-Profile Directive Millimeter-Wave Antennas Using Free-Formed Three-Dimensional (3-D) Electromagnetic Bandgap Structures

Abstract

We present design methodologies for directive millimeter-wave antennas using free-formed three-dimensional (3-D) electromagnetic bandgap (EBG) structures. Dispersion characteristics of 3-D EBGs have been computed by finite-difference time-domain (FDTD) simulations and the designed EBGs have been fabricated by using the extrusion free-forming technique. The fabricated EBG structures have been measured and integrated with a waveguide feed to form a Fabry-Perot cavity antenna. The prototype antenna demonstrated 10 to 14 beamwidths with measured gain of 13 dBi. The woodpile EBG antenna achieved a narrow beamwidth without resorting to complex arrays or bulky reflectors, which would make the antenna well-suited for millimeter-wave broadband mobile communications, imaging and space applications. Index Terms-Directive antenna, electromagnetic bandgap (EBG), metamaterial, millimeter-wave.

A Sector Antenna for Mobile Base Station Using MSA Array with Curved Woodpile EBG

“…From our study, we found that the proper structure of EBG is capable to enhance the gain of antenna as the additional resonant circuit which installed at front of the array panel. Furthermore, the EBG structures can be appropriately shaped for reducing the side and back lobes of the directional antenna too [17] [18]. From investigation, the sector of cylindrical woodpile EBG structures [19] are more suitable for the antenna type B.…”