A novel dual-broadband Y-shaped monopole antenna with dual shorted I-shaped strip-sleeves for 2.4/5.2/5.8-GHz wireless local area networks (WLANs) is proposed. Dual I-shaped strip-sleeves are introduced to be shorted with the ground plane to excite the upper resonant mode for operating at the 5.8-GHz band. The obtained impedance bandwidths reach about 48.5% for the 2.4-GHz band and 35.5% for the 5-GHz band, which meet the required bandwidth specifications of IEEE 802.11a/b/g standards. The measured peak antenna gains for the operating frequencies across dual WLAN bands are measured to be 4.7 and 4.9 dBi, respectively, with gain variations within 0.5 dBi.
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Hsiao et al. (2006) studied this question.
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