Dual Port Ultra Wideband Antennas for Cognitive Radio and Diversity Applications

Ultra-wideband (UWB) technology has become one of the most promising technology for shortrange high speed data communication due to its high data transmission rate and large bandwidth. These systems utilize the frequency band from 3.1GHz to 10.6 GHz, which is al‐ located to the UWB systems by the Federal Communications Commission (FCC) [1]. In this ultra-wide spectrum, several unlicensed short range communication bands are overlapping such as IEEE 802.11a WLAN and HIPERLAN/2. Therefore, one of the most effective techni‐ que to eliminate these intereferences is to integrate a narro band reject filter in the UWB an‐ tenna [2-4].

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