Comparative study on printed dual-band antennas for WLAN terminal

This article briefly reports several kinds of printed dual-band antennas with their structural features and performances for WLAN terminal application. In comparison, the folded-dipole with stripbar is good in omni-directional pattern and most compact, but impedance matching to 50 Ω feed-line is only cover 2.4 GHz band of IEEE 802.11b and 5.2 GHz indoor sub-band of IEEE 802.11a; the inverted-F antenna with inverted-Z stub is matching for all WLAN bands of 2.4/ 5.2/ 5.8 GHz, but its pattern is not satisfied, and the lengthg is most longer; the branched-monopole with doublebranches is also matching for all WLAN bands, but its pattern is more unsatisfied with -15 dB notch, and relatively longer in length.