Abstract-An ultra-wideband (UWB) U type monopole antenna fed by a coplanar waveguide (CPW) is proposed. It has low profile and very compact size (14.48 mm × 28.74 mm × 0.8 mm). It provides an wide impedance bandwidth ranging from 3.08 GHz to about 12.75 GHz adjustable by variation of its parameters, such as the relative permittivity and thickness of the substrate, width, and feed and ground plane dimensions. Parametric study is presented. Details of the proposed ultra-wideband design are described. Simulation results are presented and discussed in this paper.

Abstract-In this paper, a new compact circular monopole ultrawideband antenna with multiple narrow bands notched is proposed, which is implemented by using the existing techniques, such as loading a L-type band-stop filter, inserting a split ring resonator (SRR), and the method we proposed that connecting L branches on the radiation disk. Four sharp notches at 2.4 GHz, 3.5 GHz, 5.5 GHz, and 7.6 GHz are achieved separately. The measured VSWR shows a good agreement with the simulation results. The radiation patterns are obtained from Ansoft HFSS simulations and verified by CST Microwave Studio. The results prove that this kind of antenna can be applied in the UWB communication systems to avoid interference with other wireless systems, such as the 2.4 GHz WLAN, 3.5 GHz WiMax, and 5.8 GHz WLAN etc. The parameters determining the antenna's band notched characteristic are discussed.

A small slot‐loaded elliptical antenna with a band‐notched for ultra wide‐band (UWB) applications is presented in this article. Printed on a dielectric substrate with relative permittivity of 4.4, thickness of 1 mm, and fed by a 50 Ω microstrip line, the proposed antenna satisfies the UWB bandwidth requirement of 3.1–10.6 GHz. A slot is used to reject the frequency band (5.15–5.825 GHz) limited by IEEE802.11a. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 973–976, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24247

This letter presents two ultra‐wideband (UWB) antennas with 3.4/5.5 GHz dual‐notched bands. The U‐ and V‐slots are used to reject the frequency band (3.3–4.2 GHz) limited by C‐band satellite communication and Wimax systems. Another rejection band (5.15–5.825 GHz), limited by IEEE 802.11b or HIPERLAN/2 system, is obtained by using the U/V‐slot defected ground structure. Experimental results indicate that these antennas cover the entire UWB for voltage standing wave radio <2, except two notched bands. Moreover, these antennas have omnidirectional radiation patterns in the H‐plane and good gain flatness. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2942–2945, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24792

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