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Ali Imran Najam, Yvan Duroc and Smail Tedjini *Grenoble Institute of Technology, France* 

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**Chapter 11**

© 2012 Weng et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

© 2012 Weng et al., licensee InTech. This is a paper distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

**Creating Band-Notched Characteristics** 

**for Compact UWB Monopole Antennas** 

In 2002, the FCC in the US authorized the unlicensed use of the ultrawideband (UWB) frequency spectrum for commercial applications in the range from 3.1 to 10.6 GHz with an emission limit of -41.3 dBm/MHz which is near to the thermal noise floor [1]. UWB communication systems operating in such a wide frequency band and low power emission level could easily be interfered by the existing nearby communication systems such as the Wireless Local Area Networks (WLANs) operating in the frequency bands of 2.45-GHz (2.4– 2.484 GHz), 5.25-GHz (5.15–5.35 GHz) and 5.75-GHz (5.725–5.825 GHz) [2] and the Worldwide Interoperability for Microwave Access (WiMAX) systems operating in the 2.35- GHz (2.3-2.4 GHz), 2.6-GHz (2.5–2.69 GHz), 3.35-GHz (3.3-3.4 GHz), 3.5-GHz (3.4–3.6 GHz), 3.7-GHz (3.6-3.8 GHz) and 5.8-GHz (5.725–5.85 GHz) bands[3]. Many countries such as the UK, Canada, France, Germany, Argentina and India etc. will allow at least four of these bands in operations [3]. In such cases, the UWB systems could be affected by several interference signals. These interference signal could be suppressed by using RF filtering.

Traditional filtering is implemented using lumped elements, which however increases the cost and system complexity and occupies more space in the wireless devices. Another feasible solution is to design the UWB antennas with band-notched characteristics to suppress the interference signals [4, 5]. Figure 1 shows a general design concept for a bandnotched UWB antenna. An UWB antenna, as shown in Figure 1(a), has an impedance bandwidth from *fL* to *fH*, which are the lowest and highest -10-dB cut-off frequencies, respectively, of the S11. A bandstop resonant structure, as shown in Figure 1(b), also has a bandwidth from *fL* to *fH*, but with a resonant frequency at *fN* to stop the undesired signal passing through. Combining the UWB antenna with the resonant structure as shown in Figure 1(c), a band-notched antenna is formed. The band-notched antenna will not interfere

with other communication systems nearby using the same frequency band at *fN*.

Y.F. Weng, S.W. Cheung, T.I. Yuk and L. Liu

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/50190

**1. Introduction** 
