Abstract

Among short-range wireless communication systems, Ultra-wideband (UWB) technology, with a frequency allocation of 3.1–10.6 GHz, has gained a lot of popularity from researchers and the wireless industry alike due to the high data transfer rate (110–200 Mb/s) and low power consumption. However, since UWB covers the frequency spectrum of Wireless Local Area Network (WLAN) operating at 5.2 GHz (5150–5350 MHz) and 5.8 GHz (5725–5825MHz), a frequency notched function in the UWB antenna design is greatly desirable to avoid interferences from WLAN. Since 2002, various antenna structures [1, 2] and methods to notch a specific frequency band [1, 3, 4] have been introduced. Moreover, a planar integrated antenna working on both Bluetooth and UWB has been recently introduced for systems operating in those two communication systems [5, 6].

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