Miniaturisation Of Ultra-Wideband Filtrers Using E-Shape Structure

Since its qualification the UWB technology has received much attention for short-range high-speed wireless system applications such as wireless personal area networks (WPANs) USB Bluetooth health care devices and radar/sensors (car parking body detection and range-finder). The unlicensed frequency range for the UWB is between 3.1 GHz and 10.6 GHz within which a low power transmission at -41 dBm has been authorized by the federal communication commission (FCC) in February 2002. Due to this huge demand research on UWB devices has been rapidly increased. A key passive component in UWB systems is the front-end filter required to meet some stringent specifications including compactness low insertion loss flat group delay in-band frequency rejection notch high selectivity and deep stop band attenuation with wideband rejection. However miniaturizing high performance microstrip UWB band pass filters has always been a challenging task.