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In this letter, a differential coplanar waveguide (CPW)-fed ultra-wideband (UWB) antenna with dual notched bands is presented. The proposed antenna is mainly composed of two C-shaped radiating elements and a polygon slot ground plane. To alleviate the electromagnetic signal interference, two pairs of open-ended slots etched on the ground plane are adopted to reject 3.5 GHz WiMAX band while a pair of Y-shaped slots embedded in the C-shaped radiating elements is used to filter 5.5 GHz WLAN band. Measured results demonstrate that a 10-dB impedance bandwidth implemented is 131% (from 2.57 to 12.31 GHz), along with dual notched bands of 3.29-3.95 GHz and 4.73-6.55 GHz. Furthermore, the low cross-polarization is obtained because of differential feeding structure. Finally, the antenna expresses good radiation patterns in the whole operating band. [ABSTRACT FROM AUTHOR]

In this paper, a dual-band multiple-input multiple-output (MIMO) antenna with a planar and rotational symmetric structure is presented. The proposed antenna comprises two via-fed monopole antennas arranged orthogonally in cross-pairs. When each monopole is excited, the other can be employed as a parasitic element. By properly adjusting the antenna dimensions, two resonant modes can be generated at about 2.45 and 5.6 GHz. Besides, the radiation patterns of two monopoles are orthogonal to each other, resulting in good pattern diversity and high isolation without using additional decoupling methods. Measured results show that two operating bands ranging from 2.3-2.75 and 5.09-6.16 GHz are obtained, which can cover the whole (2.4/5.2/5.8-GHz) wireless local area network (WLAN) bands. Port-to-port isolation is more than 24 and 22 dB at the lower and higher operating bands, respectively. Envelope correlation coefficient is studied as well. [ABSTRACT FROM AUTHOR]