A Pattern-Reconfigurable Antenna Using Tunable Band-Stop FSS With Reduced Switching Elements
Patrick Danuor, Jung-Ick Moon, Jung‐Nam Lee, Young‐Bae Jung
Abstract
This letter details the design of a compact pattern-reconfigurable antenna that is based on the analysis of a tunable gap-incorporated band-stop frequency selective surface (FSS) unit cell. By changing the state of the RF PIN diode, the proposed FSS unit cell can demonstrate either a dipole-resonance mode or a circulating-current mode, thus allowing it to behave as a reflective or transparent structure, respectively, around the same frequency. A simple pattern-reconfigurable antenna with reduced active switching elements for omnidirectional and directional beam-steering that is created by utilizing the proposed FSS unit cell can fulfill the desired function while avoiding the complexities involved in employing large FSS arrays. A prototype of the proposed antenna is fabricated and measured, and it shows a return loss |<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S</i><sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub>| < –10 dB from 1.7 GHz to 1.8 GHz, along with a peak gain of 6.8 dBi. Ultimately, this proposed antenna is expected to be applicable in various wireless communication systems.