Title :
Compact broadband bandpass filters with two transmission zeros
Author :
Chen, Hai-Bo ; Jin, Long
Author_Institution :
Res. Inst. of Electron. Sci. & Technol., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A novel, compact bandpass filter is proposed using stepped-impedance resonators (SIRs). The basic filter structure is composed of two parts, the central SIR sections and the input/output (I/O) SIR sections. The two central SIRs are folded to achieve a compact size and coupled to the I/O SIRs. This new structure has an inherent transmission zero on the upper stopband edge. The skew-symmetric feeding structure is introduced and can provide an additional transmission zero on the lower stopband edge. As a result, the filter with two transmission zeros exhibited extremely sharp rejection skirts around the target passband. The filters with two transmission zeros and four transmission poles have a fractional bandwidth (BW) Δ = 36%. Measured results of experimental circuits show good agreement with simulated responses.
Keywords :
band-pass filters; microstrip filters; I/O; compact broadband bandpass filters; input-output SIR section; sharp rejection skirts; skew-symmetric feeding structure; stepped-impedance resonators; transmission zeros; Band pass filters; Broadband communication; Filtering theory; Impedance; Microstrip filters; Passband; Resonator filters; Broadband BPF; SIRs; high selectivity;
Conference_Titel :
Signal Processing, Communications and Computing (ICSPCC), 2011 IEEE International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4577-0893-0
DOI :
10.1109/ICSPCC.2011.6061745
