Abstract-In this paper, a novel double-printed trapezoidal patch dipole antenna suitable for UWB applications with band-notched characteristic is presented and investigated.The band-notched characteristic is achieved by inserting T-shape slots on the trapezoidal radiating patches. The impedance characteristic, radiation patterns and the transfer function are studied. Experimental results show that the proposed antenna covers the entire UWB band (3.1-10.6 GHz) while it has a notched band for the IEEE 802.11a frequency band (5.15-5.825 GHz). Measured group delay, transmission characteristics and Time domain characteristics indicate that the proposed antenna satisfies the requirement of the current wireless communications systems.

In this article, a novel compact elliptical monopole ultra‐wideband antenna with dual notched bands is proposed and investigated. The dual‐notched characteristic is realized by an elliptic arc‐shaped slot inserted in the elliptical monopole and a compact coplanar waveguide resonant cell in the feed line. The measured results show that the frequency band of VSWR ≤2 covers 3.1 to 10.6 GHz UWB band, while the notched frequency bands are 3.45–3.75 GHz which covers 3.5 GHz WIMAX and 5–6 GHz which covers 5.15–5.85 GHz WLAN band, and the two notched bands are separately achieved. The proposed antenna has a monopole‐like radiation patterns. Gain of the proposed antenna and transfer function study show that dual band‐notched characteristics achieved which conforms with the results of VSWR. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1306–1310, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25176