Abstract
An improved omni-directional microstrip patch antenna array is prsented for 2.4-GHz wireless local area network (WLAN). The considerable radiation performance is guaranteed by two microstrip patch elements fed in series. Compared with conventional designs, a transition section is introduced at the bottom of the patch elements to achieve better impedance matching. Therefore, our proposed antenna array achieves good omni-directional radiation while enhancing the impedance matching. The proposed antenna array achieves a bandwidth of 17.7% (2.21-2.64 GHz) for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{VSWR}\leq 2$</tex> . The radiation patterns in the azimuthal plane with a gain variation less than 1.0 dB and a gain more than 3.8 dBi are obtained within the WLAN band (2.4-2.483 GHz).
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