Frequency reconfigurable antenna based on epsilon negative transmission lines

Abstract

AbstractA novel coplanar waveguide (CPW)‐fed frequency reconfigurable antenna based on epsilon negative transmission line (ENG‐TL) is presented in this letter. By controlling the switch, the parameters of the ENG‐TL structure unit are changed, and the antenna can work on different frequency bands. By using varactor diode as a switch, the resonant frequency of the antenna continuously varies from 2.55 to 3.45 GHz while the bandwidth of 450 MHz keeps unchanged, which is suitable for n77 of sub‐6 GHz. But by using the PIN diode as a switch, the antenna can be reconfigured on three modes, lower single‐band (2.33–2.81 GHz), dual‐band (1.67–1.81 GHz and 3.32–3.60 GHz), and higher single‐band (3.98–4.22 GHz). The designed antenna is suitable for use in WLAN, DCS, and WiMAX (2.5/3.3 GHz). The simulated results are in good agreement with the measured results.