Abstract
A compact band pass filter with a fractional bandwidth of 59% is designed for Ultra Wide Band (UWB) applications using a microstrip 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 (13.2 x 9.7) mm. The filter offers desirable performance for the lower-band frequency of a UWB system and exhibits low insertion loss. As the structure comprises of only transmission line sections and no coupling gap, the filter is made easy for fabrication. This UWB BPF is useful to alleviate the strong WLAN signals interference to UWB receivers. To illustrate the concept, band pass filter was designed using Agilent ® ADS
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