Stopband-Extended Balanced Bandpass Filter Using Coupled Stepped-Impedance Resonators

• Published in: IEEE microwave and wireless components letters Vol. 17; no. 7; pp. 507 - 509
• Main Authors: WU, Chung-Hwa, WANG, Chi-Hsueh, CHUN HSIUNG CHEN
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.07.2007; Institute of Electrical and Electronics Engineers
• Subjects: Acceptability; Applied sciences; Balanced filter (BPF); Balancing; Band pass filters; Bandpass filters; Circuit properties; coupled-resonator BPF; Coupling circuits; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Feeds; Frequency filters; Frequency response; Impedance; Magnetic separation; Microwaves; Oscillators, resonators, synthetizers; Passband; Rejection; Resonator filters; Resonators; stepped-impedance resonator (SIR); stopband extension; System-on-a-chip; Working environment noise; Common mode rejection rate; Stepped impedance device; Non linear filter; stopband extension; coupled-resonator BPF; Band pass filter; Compact design; Balanced filter (BPF); Passband; stepped-impedance resonator (SIR); Implementation; Coupled resonator
• ISSN: 1531-1309; 1558-1764
• DOI: 10.1109/LMWC.2007.899311

A novel fourth-order balanced bandpass filter is proposed based on the half-wavelength (lambda/2) stepped-impedance resonators (SIRs). By properly adjusting the parameters of each SIR, the proposed filter may be made compact and its stopband may also be extended simultaneously. Specifically, a balanced filter with acceptable common-mode rejection is implemented with its differential-mode and common-mode stopbands extended up to 5.5 f o d , where f o d is the center frequency of differential-mode passband.