Title :
Low-loss and high-selectivity bandpass filter with harmonic suppression and piezoelectric transducer tuning
Author :
Hsieh, Lung-Hwa ; Chang, Kai
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
5/15/2003 12:00:00 AM
Abstract :
A low-loss and high-selectivity bandpass filter with harmonic suppression and piezoelectric transducer (PET) tuning is presented. At the 3.5 GHz passband, the insertion loss is 1.48 dB, and the transmission zeros at 3.05 and 4.08 GHz have a rejection of 55 dB. The rejection at the 7 GHz second harmonic is 50 dB. A PET tunes the bandstop sections to obtain a tunable suppression (>45 dB) around the second harmonic from 5.35 to 7.8 GHz.
Keywords :
band-pass filters; circuit tuning; harmonics suppression; losses; microstrip filters; microstrip resonators; microwave filters; passive filters; piezoelectric transducers; resonator filters; 1.48 dB; 3.05 to 7.8 GHz; SHF; asymmetric-fed ring resonators; harmonic suppression; high-selectivity bandpass filter; input stopband circuits; insertion loss; low-loss filter; microstrip ring resonator; open-loop ring resonators; output stopband circuits; piezoelectric transducer tuning; transmission zeros;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20030514
