IEEE TRANSACTIONS ON ANTENNAS AND （在天线和IEEE事务）.pdf

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 53, NO. 5, MAY 2005 1813 Dual-Band WLAN Dipole Antenna Using an Internal Matching Circuit Zhijun Zhang, Senior Member, IEEE, Magdy F. Iskander, Fellow, IEEE, Jean-Christophe Langer, and Jim Mathews Abstract—A dual-band dipole antenna for wireless local area antenna in 5 GHz band was 400 MHz and thus is not sufficiently network (WLAN) is designed and experimentally tested at both the broad to cover the entire 5 GHz band. Su et al. [5] reported a 2.4 and 5 GHz (IEEE 802.11b/g and 802.11a) WLAN bands. The dual-band dipole in which the two resonances were obtained by design procedure involves obtaining a full resonance frequency in the 2.4 GHz band and then using a matching network to achieve cutting a U-slot in the arms of dipole. In this case, the bandwidth a secondary resonance at the 5 GHz band. It is shown that by cor- in 5 GHz band was 370 MHz and this is once again insufficient rectly designing the dipole, the matching network can be simplified to cover the entire band. Chen [6] reported a multiband printed to only one series inductor. The design was experimentally veri- sleeve dipole antenna that uses different strip pairs to compose fied by constructing a dipole on a FR4 board (12 mm 45 mm various resonance frequencies. This antenna actually provided 0 45 mm) and measuring its input impedance and the radiation characteristics at both bands. The measured VSWR 2:1 bandwidth sufficient bandwidth in both the 2.4 and 5 GHz band, but the in the 2.4 GHz band is 710 MHz, and the bandwidth in 5 GHz band azimuth average gain in 2.4 GHz was low, around 0 dBi, which is wider than 1 GHz. The VSWR 3:1 bandwidth is more than 3.6 means