Compact penta-band antenna for portable and embedded devices

The paper presents the design of a compact penta-band antenna for portable and embedded devices. The bands covered include GSM-900/1800/1900, UMTS-2100 and 2.4 GHz WLAN. A folded planar inverted-F antenna with a relocated shorting-stub and a secondary arm introduced on the bottom layer of the substrate provides resonances at the 900, 1800 and 2400 MHz bands. The inclusion of a narrow slot in the ground plane offers an additional resonance at 2300 MHz, resulting in more than 800 MHz bandwidth centered at 2100 MHz. The final design is confirmed by measurement showing the 6 dB return loss from 890-960 and 1650-2550 MHz with better than 10 dB return loss at the centers of the GSM-900/1800 and 2.4 GHz WLAN bands.