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Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China
A monopole antenna with modified ground plane is presented for 2.4GHz and 5GHz WLAN applications in this letter. A trapezoid patch and a quasi-fractal slotted patch are printed on two FR-4 dielectric substrates as the radiator and the ground plane of the antenna, respectively. The element of the quasi-fractal slot structure is a circular ring with 4 branches. The radiation characteristics are simulated and experimentally verified, and the results show that the proposed antenna has good radiation performance.