This paper presents a directional radiation antenna designed for wireless local area network applications. The proposed antenna consists of two FR4 substrates, each with dimensions of 80 mm × 50 mm × 1.59 mm. A rectangular microstrip line is printed on the top surface of the upper substrate and fed by an RF cable through a via. On the bottom surface of the upper substrate, a defected ground plane featuring two semi-ellipses is printed. To enhance the antenna’s directional radiation capability, a substrate composed of artificial magnetic conductors is placed beneath the antenna, maintaining a distance of 25 mm between the two substrates. The proposed antenna operates across the frequency bands of 2.32–3.2 GHz and 4.9–5.9 GHz, effectively covering the IEEE 802.11a/b/g frequency bands of 2.4–2.4835 GHz, 5.15–5.35 GHz, and 5.725–5.85 GHz. It exhibits ideal radiation patterns in both the vertical and horizontal planes, with peak gains of 4.37 dBi at 2.4 GHz and 7.67 dBi at 5.5 GHz. The measured total radiation efficiencies are 67.9% at 2.4 GHz and 85.2% at 5.5 GHz. These measurement results demonstrate the antenna’s strong potential for use in wireless communication applications.
He et al. (Tue,) studied this question.