A single feed planar antenna with 4G tunable bands and consistent upper LTE bands between 1.29–2.05 GHz

Abstract

A compact single feed dual‐band meandered planar antenna with 4G tunable bands and 1.29–2.05 GHz consistent bands is proposed here. In this antenna design, a varactor diode is implemented on the meandered arm to tune the operational frequency of the lower band between the 690 and 970 MHz frequencies. While the 4G band tuning, the rectangular‐shaped cutout portion of the antenna provides a consistent frequency bandwidth of 1.29–2.05 GHz. The measured fractional bandwidth of the entire tunable lower band range is 33.7% and a consistent 45.5% fractional bandwidth in the higher band. Both the tunable and consistent frequencies are experimentally verified to show acceptable matching based on S11 ≤ −6 dB criteria and near‐omnidirectional radiation patterns. The antenna is able to cover several wireless (LTE) communication bands including 4G.