In this article, a printed ring shaped monopole ultra‐wideband antenna with band‐notched feature is presented and investigated. To get the band‐notched characteristic, a quarter wavelength tuning stub is embedded into the ring radiator. The measured results show that the proposed antenna meets the requirement of wide working bandwidth of 3.1–10.6 GHz with VSWR < 2, while avoiding the interference with the wireless local area network band (5.150–5.825 GHz). The transfer function (amplitude of S21/group delay) and time domain characteristic (fidelity/power spectrum density) are also studied in this article. The proposed antenna has a compact size, good radiation characteristics, ultrawide bandwidth, and good time‐domain behaviors to satisfy the requirement of the current wireless communications systems. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2387–2392, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27067

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A novel U‐shaped monopole antenna suitable for ultrawideband (UWB) application is presented and investigated in this article. The antenna is developed from printed circular disc monopole antenna, and the current distribution evident that the proposed antenna has a similar current. Three steps in ground plane is designed and adjusted to obtain UWB impedance matching. Experimental results show that the proposed antenna meets the requirement of wide working bandwidth of 3.1–10.6 GHz with VSWR < 2. Study of transfer function (magnitude of S21/group delay) and time domain characteristic (waveform/fidelity) indicate a good UWB application behavior for the antenna. The proposed antenna has a compact size, good radiation characteristics, ultra wide bandwidth, and good time‐domain behaviors to satisfy the requirement of the current wireless communications systems. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1532–1537, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26840