Design and Analysis of a Microstrip Planar UWB Bandpass Filter with Triple Notch Bands for WiMAX, WLAN, and X-Band Satellite Communication Systems

This manuscript presents a UWB filter with three notch bands for WiMAX, WLAN, and X-Band Satellite Communication by introducing inverted E- and T-shape resonators shorted at the center, designed and fabricated for the use of UWB applications authorized by the US Federal Communications Commission. First, a UWB filter ranges from 2.8GHz to 10.6GHz is designed by employing four lambda/4 wavelength short-circuited stubs and then couples E- and T-shape resonators on either side of the main transmission line of the proposed UWB filter to achieve notch bands response centered at the resonance frequency of 3.3 GHz for WiMAX applications, 5.1 GHz for WLAN wireless applications, and 8.3GHz for X-band satellite communication systems, respectively. The proposed filter is able to produce three individually control stopband frequencies centered at 3.3GHz, 5.1GHz, and 8.3GHz with minimum attenuation levels of -28 dB, -19 dB, and -15 dB, respectively. This indicates that the presented filter can efficiently reject superfluous bands at 3.3GHz in WiMAX system, 5.1GHz in WLAN system, and 8.3GHz in satellite communication systems to improve the performance of the UWB communication systems. Finally, the proposed filter with circuit area 34mm x 12mm x 0.762mm is designed and fabricated. A reasonable agreement can be seen between the simulated and fabricated measurements.