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ABSTRACT A compact coplanar waveguide fed circular wide-slot antenna with dual-band-notched characteristic is proposed by using an arc-shaped slot (ASS) and an arc-shaped parasitic element (ASPE) for ultra-wideband (UWB) communication applications. The center frequencies of the dual-notch bands can be tuned in a wide range by adjusting the parameters of the ASS and the ASPE. Both the numerical and experimental results show that the proposed antenna can operate over a wide frequency band ranging from 2.7 to 12 GHz with VSWR < 2, with the exception of the two notch bands operating at wireless local area network band and X-band. In addition, the proposed antenna has a compact size and omnidirectional radiation pattern, which is suitable for UWB communication applications. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1240-1244, 2014 [ABSTRACT FROM AUTHOR]

In this article, we propose a circular slot ultrawideband (UWB) antenna with multimode reconfigurable dual band-notched characteristics. By using a two-stage T-shaped stepped impedance resonator (TS-TSIR) and a parallel stubs loaded resonator (PSLR), dual band-notched function is achieved to reject worldwide interoperability for microwave access, WLAN, and X-band signals. The multimode reconfigurable band-notched characteristic is realized by integrating four switches onto the TS-TSIR and the PSLR. Simulated and measured results show that this antenna, with multimode reconfigurable characteristics and dual band-notched function, can operate from 2.7 to 12 GHz (VSWR<2), which includes the entire UWB band. This antenna maintains omnidirectional radiation patterns that is suitable for UWB applications. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:570-574, 2014 [ABSTRACT FROM AUTHOR]

ABSTRACT In this article, a wide-slot ultrawideband antenna with dual band-notch characteristics is proposed numerically and verified experimentally. The dual band-notch functions are obtained by using a nested split ring resonator (NSRR) and a stepped impedance resonator (SIR). The designed two notch bands are tunable by adjusting the dimension of the NSRR and the SIR. Simulation and measurement results agree well. The proposed antenna with omnidirectional radiation patterns and desired notch bands is suitable for UWB communication applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2827-2830, 2013 [ABSTRACT FROM AUTHOR]

A compact asymmetric coplanar strip-fed staircase ultrawideband (UWB) antenna with notch band reconfigurable characteristic is proposed and investigated numerically and experimentally.The reconfigurable notch bands are realized by using a spur-slot and an ideal switch. By controlling the switch at OFF and ON states, the notch bands of the proposed UWB antenna can work at 3.5 and 8.2 GHz, respectively. Numerical and experimental results show that the proposed antenna is capable of working for entire UWB application and providing the reconfigurable notch bands. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1467-1470, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27634 [ABSTRACT FROM AUTHOR]

The proposed butterfly-shaped monopole ultra-wideband (UWB) antenna consists of two radiating elements (wings) positioned with an angle between them, which provides one more dimension for impedance matching. The simulated and measured results show that the design achieves a broad impedance bandwidth and stable radiation performance over the UWB band. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 590–593, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24125 [ABSTRACT FROM AUTHOR]