Design of QuadPort MIMODiversity Antenna with TripleBand Elimination Characteristics for SuperWideband Applications A compact, lowprofile, coplanar waveguide (CPW)fed quadport multipleinputxe2x80x93multipleoutput (MIMO)diversity antenna with triple bandnotched (WiMAX, WLAN, and Xband) characteristics is proposed for superwideband (SWB) applications. The proposed design contains four similar truncatedxe2x80x93semiellipticalxe2x80x93selfcomplementary (TSESC) radiating patches, which are excited through tapered CPW feed lines. A complementary slot matching the radiating patch is introduced in the ground plane of the truncated semielliptical antenna element to obtain SWB. The designed MIMOdiversity antenna displays a bandwidth ratio of 31:1 and impedance bandwidth (S11 xe2x89xa4 xe2x88x92 10 dB) of 1.3xe2x80x9340 GHz. In addition, a complementary splitring resonator (CSRR) is implanted in the resonating patch to eliminate WLAN (5.5 GHz) and Xband (8.5 GHz) signals from SWB. Further, an Lshaped slit is used to remove WiMAX (3.5 GHz) band interferences. The MIMO antenna prototype is fabricated, and a good agreement is achieved between the simulated and experimental outcomes.

Compact DGS quad band filter for multiservice wireless communication systems using stub loaded stepped impedance resonators Abstract   This paper presents a compact dualmode quad band microstrip bandpass (BPF) and low pass (LPF) filter by using a stubloaded steppedimpedance resonator (SIR) and a shortcircuited stubloaded uniform impedance resonator. Also, ring SIR geometry is introduced to miniature the size of this filter while maintaining excellent performance. The use of a stub resonator at the central point of the ring SIR can generate two resonant modes in two pass bands. For demonstration purposes, a quadband filter for the applications of the WLANWiMAXWLANUWB at 1.73.86.9110.10, Worldwide Interoperability for Microwave Access at 3.8xc2xa0GHz and wireless local area networks at 6.91xc2xa0GHz and 10.10xc2xa0GHz is designed, and fabricated.