Title :
An Optimum Ultra-Wideband (UWB) Bandpass Filter with Spurious Response Suppression
Author :
Shaman, Hussein ; Hong, Jia-Sheng
Author_Institution :
Dept. of Electr. Electron. & Comput. Eng., Heriot-Watt Univ., Edinburgh
Abstract :
A high selectivity ultra-wideband (UWB) bandpass filter (BPF) with a fractional bandwidth (FBW) of about 110% is presented using a microstrip structure. The filter is based on a circuit model for an optimum distributed highpass filter consisting of only 5 short-circuited stubs separated by non-redundant connecting lines. As a result, the filter in a compact structure exhibited a selective filtering characteristic equivalent to a 9-pole Chebyshev filter. In addition, an optimum bandstop filter was added in order to suppress the second spurious harmonic. The design was successfully realized in theory and verified by full-wave EM simulation of the full layout and the experiment. The proposed filter had low insertion loss, sharp rejection, and a group delay of about 0.2 ns over the most center band. The filter also demonstrated an UWB reject band from 11.4 GHz to more than 20 GHz at -30 dB
Keywords :
Chebyshev filters; band-pass filters; band-stop filters; high-pass filters; interference suppression; microstrip lines; poles and zeros; ultra wideband technology; 9-pole Chebyshev filter; distributed highpass filter; full-wave EM simulation; group delay; insertion loss; microstrip structure; nonredundant connecting lines; optimum bandstop filter; optimum ultra-wideband bandpass filter; short-circuited stubs; spurious harmonic suppression; spurious response suppression; Band pass filters; Bandwidth; Chebyshev approximation; Circuits; Filtering; Insertion loss; Joining processes; Microstrip filters; Power harmonic filters; Ultra wideband technology;
Conference_Titel :
Wireless and Microwave Technology Conference, 2006. WAMICON '06. IEEE Annual
Conference_Location :
Clearwater Beach, FL
Print_ISBN :
1-4244-0849-0
Electronic_ISBN :
1-4244-0849-0
DOI :
10.1109/WAMICON.2006.351902
