Title :
A resistor-loaded microstrip line resonator with a punched hole structure for ultra-wide-stopband bandpass filters
Author :
Uchida, Hiromitsu ; Komaru, Ryota ; Hangai, Masatake ; Nakayama, Masatoshi ; Hirano, Yoshihito
Author_Institution :
Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kamakura, Japan
Abstract :
A novel microstrip line resonator is proposed for ultra-wide-stopband microwave bandpass filters. It consists of a stepped-impedance resonator (SIR) with a high-impedance transmission line on punched hole structure (PHS), and thin-film resistors implemented in the SIR for absorbing higher-order resonance power. A fabricated 2-stage microstrip bandpass filter at f0 = 2.0 GHz has realized a spurious response level <; -29 dB up to 25 f0, which seems to be the superior wide-stopband performance among ever-reported ones in the category of microwave microstrip line filters.
Keywords :
band-pass filters; band-stop filters; microstrip lines; microwave filters; resonator filters; thin film resistors; transmission lines; 2-stage microstrip bandpass filter; frequency 2 GHz; high-impedance transmission line; punched hole structure; resistor-loaded microstrip line resonator; stepped-impedance resonator; thin-film resistors; ultrawide-stopband bandpass filters; Microwave theory and techniques; Bandpass filters; harmonic suppression; microstrip filters; microwave resonators; spurious response; thin film resistors;
Conference_Titel :
Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-61284-754-2
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2011.5972744
