Abstract
This paper presents a novel spurious suppressed bandpass fllter 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 flrst and second spurious responses, and the other is used to improve skirt selectivity. The current study analytically derives explicit design equations and fabricates a three- pole Chebyshev bandpass fllter centered at 1.5GHz based on the direct- coupled structure. The experimental results show spurious suppression improvement more than 20dB up to 5.6f0.
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