Design of Microstrip UWB Bandpass Filter Using Open-Circuited Resonators
A compact band pass filter with a fractional bandwidth of 59% is designed for Ultra Wide Band (UWB) applications using a micro-strip structure consisting of open circuit resonators. Transmission zeros are utilized at the passband edges to enhance the signal selectivity. The filter is characterized by sharp roll-off characteristics due to the presence of transmission zeros. The insertion loss and return loss are found to be 0.1dB and -15dB respectively. This filter has a measured 3-dB passband of (3 to 5.5) GHz, with a compact size of (13.2x9.7) mm.