1Department of Electrical EngineeringUniversity of Semnan
2School of Electrical and Computer Engineering, College of Engineering,University of Tehran,
3Department of Electrical EngineeringSharif University of Technology
44 School of Electrical and Computer Engineering, College of Engineering,University of Tehran
a compact size and lightweight planar ultra-wideband (UWB) antenna with an omnidirectional radiation pattern and a stable gain in the frequency range 3.1-10.6 GHz is proposed and investigated. The antenna consists of an elliptical shaped slot which is fed by a 50-Ω microstrip line that is beveled and has fork-shaped is designed. Attaching two inverted U-shape strips at the upper part of the slot, two additional bands are realized covering GPS, upper part of GSM (1770–1840 MHz), and Bluetooth (2385–2490 MHz) bands. The calculated return loss, omni-directional radiation pattern, and peak gain are in good agreement with the measurement results. The antenna can provide high-performance wireless communications over different frequency bands. This structure has a compact size (27×24 mm2), is lightweight, and can be easily fabricated. According, the proposed antenna is expected and normal to be a good candidate in various applications in portable and lightweight communication system.