Title :
Wide Stopband Parallel-Coupled Stacked SIRs Bandpass Filters With Open-Stub Lines
Author :
Tang, Ching-Wen ; Chen, Ming-Guang
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Chiayi
Abstract :
In this letter, spurious passband suppression in parallel-coupled stacked stepped-impedance-resonators (SIRs) bandpass filters (BPFs) by means of open-stub lines is proposed and implemented. These filters are composed of parallel-coupled stacked SIRs and open stubs. Moreover, the structure with tapped feeding is employed to create transmission zeros near both sides of the passband skirt. The proposed structure can improve the harmonic suppression so that a wide upper stopband with a satisfactory attenuation level would appear in this BPF. Measured results of the fabricated circuits show that the idea works very well
Keywords :
band-pass filters; harmonics suppression; microstrip filters; poles and zeros; resonator filters; bandpass filters; harmonic suppression; open-stub lines; spurious passband suppression; stepped-impedance-resonators filters; tapped feeding; transmission zeros; wide stopband filter; Band pass filters; Coupling circuits; Filtering theory; Harmonics suppression; Microstrip; Passband; Power harmonic filters; Radio frequency; Resonator filters; Signal synthesis; Bandpass filter (BPF); open stub; stepped-impedance-resonator (SIR);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.885620
