[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 UTZ776`S&X  
Dual-Band WLAN Dipole Antenna Using an Internal ,{k<JA{  
Matching Circuit ~?#~Ar  
Zhijun Zhang, Senior Member, IEEE, Magdy F. Iskander, Fellow, IEEE, Jean-Christophe Langer, and Jim Mathews gUl1CH&  
Abstract—A dual-band dipole antenna for wireless local area vqq6B/r@Fu  
network (WLAN) is designed and experimentally tested at both the `-VG ?J  
2.4 and 5 GHz (IEEE 802.11b/g and 802.11a) WLAN bands. The w6vLNX  
design procedure involves obtaining a full resonance frequency in 807al^s x  
the 2.4 GHz band and then using a matching network to achieve 0 _Q*E3  
a secondary resonance at the 5 GHz band. It is shown that by correctly b-PSm=`  
designing the dipole, the matching network can be simplified jm+ V$YBP  
to only one series inductor. The design was experimentally verified hZcmP"wgC1  
by constructing a dipole on a FR4 board (12 mm 45 mm \B_i$<Sz  
0 45 mm) and measuring its input impedance and the radiation s(teQ\  
characteristics at both bands. The measuredVSWR2:1 bandwidth vR7ctav  
in the 2.4 GHz band is 710 MHz, and the bandwidth in 5 GHz band =0,|/1~  
is wider than 1 GHz. The VSWR 3:1 bandwidth is more than 3.6 U+-F*$PO+  
GHz and it covers from 2.32 GHz to above 6 GHz. It is significant wHx}U M"  
that the designed dual-band dipole maintained good radiation efficiency mge#YV::  
values at both bands. Specifically, and based on the measured /K7Bae5h  
radiation patterns, an efficiency value of 85% 87% is obtained ]k[x9,IU\y  
at 2.4 GHz a .. .>}BNy  
6N"m?g*Z d  

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