[天线]Dual-Band WLAN Dipole Antenna Using an Internal Matching Circuit

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 53, NO. 5, MAY 2005 1813 v{X<6^g  
Dual-Band WLAN Dipole Antenna Using an Internal ntntB{t  
Matching Circuit f#kT?!sP  
Zhijun Zhang, Senior Member, IEEE, Magdy F. Iskander, Fellow, IEEE, Jean-Christophe Langer, and Jim Mathews Gsu?m  
Abstract—A dual-band dipole antenna for wireless local area |[)n.N65=  
network (WLAN) is designed and experimentally tested at both the b+CJRB1  
2.4 and 5 GHz (IEEE 802.11b/g and 802.11a) WLAN bands. The X`fb\}~R(  
design procedure involves obtaining a full resonance frequency in U38~m}c  
the 2.4 GHz band and then using a matching network to achieve 2e9.U/9  
a secondary resonance at the 5 GHz band. It is shown that by correctly ubv>*iO  
designing the dipole, the matching network can be simplified SJ2l6  
to only one series inductor. The design was experimentally verified '.wb= C  
by constructing a dipole on a FR4 board (12 mm 45 mm _CMNmmp`e  
0 45 mm) and measuring its input impedance and the radiation U,K=(I7OBX  
characteristics at both bands. The measuredVSWR2:1 bandwidth D&{CC  
in the 2.4 GHz band is 710 MHz, and the bandwidth in 5 GHz band i IM\_<?  
is wider than 1 GHz. The VSWR 3:1 bandwidth is more than 3.6 ox*>HkV  
GHz and it covers from 2.32 GHz to above 6 GHz. It is significant  i
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that the designed dual-band dipole maintained good radiation efficiency v`@NwH<r  
values at both bands. Specifically, and based on the measured tv_&PIu]L  
radiation patterns, an efficiency value of 85% 87% is obtained G*f\ /  
at 2.4 GHz a .. FP'-=zgc  
G}Ko*:fWS  

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