Novel Microstrip Bandpass Filters Using Direct-coupled Triangular Stepped-impeda- Nce Resonators for Spurious Suppression
نویسندگان
چکیده
This paper presents a novel spurious suppressed bandpass filter designed with triangular stepped-impedance resonators. The proposed resonators are folded for a triangular schematic, which creates two transmission zeros. By varying the line width of resonators, one of the zeros is tuned to suppress the first and second spurious responses, and the other is used to improve skirt selectivity. The current study analytically derives explicit design equations and fabricates a threepole Chebyshev bandpass filter centered at 1.5 GHz based on the directcoupled structure. The experimental results show spurious suppression improvement more than 20 dB up to 5.6f0.
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