Title :
Sharp-rejection bandstop filter based on signal interference technique integrating with conventional open stubs
Author :
Qing-Xin Chu ; Lei-lei Qiu
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
A novel sharp-rejection bandstop filter (BSF) based on signal interference technique integrating with conventional open stubs is proposed in this letter. The two paths are constructed by embedding a U-shaped short-circuited stepped-impedance resonator (SIR) structure in the traditional BSF with open stubs. The impedance ratio of the SIR can be tuned to control the bandwidth of the BSF. The ripple level and selectivity can be adjusted through regulating transmission lines impedance and the coupling coefficient. Four transmission zeros with sharp-rejection can be realized. The BSF is verified by circuit implementation and good agreement between the simulated and measured results can be observed.
Keywords :
band-stop filters; circuit tuning; interference (signal); poles and zeros; resonator filters; transmission lines; SIR; U-shaped short circuited stepped impedance resonator; coupling coefficient; impedance ratio; open stubs; sharp rejection bandstop filter; signal interference technique; transmission lines impedance; transmission zeros; Educational institutions; Filtering theory; Microwave FET integrated circuits; Microwave filters; Microwave integrated circuits; Passband; Power transmission lines; bandstop filter; sharp-rejection; shorted stepped-impedance resonator; signal interference technique;
Conference_Titel :
Microwave Symposium (IMS), 2014 IEEE MTT-S International
Conference_Location :
Tampa, FL
DOI :
10.1109/MWSYM.2014.6848397
