Dual ISM band printed antenna with omnidirectional radiation pattern and better radiation efficiency

摘要

Designing a high gain planar antenna on the low-cost FR4 substrate is one of the major challenging tasks for the researchers. The omnidirectional radiation pattern is desired for 360 degrees coverage. Both of these requirements have been addressed in this article. This article presents a dual band printed antenna designed on an FR4 substrate of 1.6 mm thickness. The proposed antenna operates in the ISM band of 2.4 and 5.8 GHz for the application of dual-band WLAN/WIFI. The proposed antenna consists of a circular patch and ring-shaped ground plane. The overall dimension of the antenna is 66 x 66 x 1.6 mm(3). Excellent impedance matching and radiation efficiency for both the bands have been achieved. The proposed antenna shows omnidirectional radiation pattern at 2.4 GHz ISM band and nearly omnidirectional pattern along with high gain of 4.7 dBi at 5.8 GHz ISM band.