This article describes a new miniaturized omni-directional antenna with quasi-self-complementary\nstructure for wireless communication applications. A novel ground structure composed of\nfive rectangular plates is proposed to enhance the impedance bandwidth and reduce the antenna\nsize. The proposed antenna is comprised of two patches surrounded by the ground structure. Two\nmetal patches of the antenna are located on two opposite sides of the dielectric substrate. The feed\npatch is used to excite the radiation patch. This unique design is realized by properly choosing the\nsuitable feed patch shape, selecting similar slot shape on the radiation patch, and tuning their dimensions.\nThe proposed antenna with an extremely small size of 6 mm Ã?â?? 9 mm has an operating\nimpedance bandwidth ranging from 4.5 to 6.1 GHz for S11 < 10 dB, which also covers the two IEEE\n802.11a wireless local area network bands (5.15 - 5.35 GHz and 5.725 - 5.825 GHz). In addition to\nbe very small in size, the antenna exhibits omni-directional radiation patterns in the entire operating\nbandwidth and low cross polarization. The distortionless time domain performance of the\nantenna is confirmed by investigation of the phase response and group delay. The obtained results\nin both frequency and time domain show that the proposed antenna is suitable for use in wireless\ncommunication systems.
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